-->Process and Technology of Pulping and Papermaking

Preparation and Properties of PPTA Chopped Fibers/Copolymerized Modified PPTA Precipitated Fibers Composite Paper

XIE Ping,ZHAO Kairong,HU Zuming,YU Junrong,WANG Yan,LI Na — 2024/9/18 16:43:29

M-phenylenediamine （MPD） with meta structure was introduced into the poly-p-phenylene terephthamide （PPTA） molecular chain via copolymerization strategy. The copolymerized modified PPTA （MPPTA） was prepared by low temperature solution copolymerization. Then MPPTA precipitated fibers （pMPPTA） were obtained by precipitation method. cPPTA/pMPPTA composite paper was prepared by combining pMPPTA with PPTA chopped fibers （cPPTA） via wet forming process. The effects of basis weight and pMPPTA dosage on the properties of cPPTA/pMPPTA composite paper were investigated. The results showed that basis weight and pMPPTA dosage had a significant influence on the microstructure of the composite paper. When the basis weight of cPPTA/pMPPTA composite paper was 90 g/m² and the mass fraction of pMPPTA was 60%， the mechanical and dielectric properties of cPPTA/pMPPTA composite paper were significantly higher than those of PPTA original paper， and the tensile strength reached 32.27 MPa.

Study on Ozone Bleaching Process of Oxygen Bleached Eucalyptus Soda-AQ Pulp

GAO Qichao,YANG Guihua,ZHANG Kai,ZHANG Wei,QIU Xiaoyan,LIU Zehua,CHEN Jiachuan — 2024/9/18 16:43:31

In this study， ozone bleaching technology was introduced into bleaching process of soda-AQ pulp after oxygen delignification treatment. The effects of ozone concentration， temperature， type and dosage （relative to dry pulp weight） of protectant on the bleached pulp and physical properties of paper prepared were studied to preliminarily obtain the optimum bleaching parameters. The results showed that when 80 g/Nm³ of ozone was used in bleaching process with 1.0% of oxalic acid as protective agent at 10 ℃， the bleached pulp with 72.8% brightness was produced， the viscosity and Kappa number of it were 678 mL/g and 4.18， respectively. Besides， physical properties of paper prepared by bleached pulp were tested， the tensile index of paper was up to 78.9 N·m/g， and the burst index， tearing index and folding times were 4.99 kPa·m²/g， 5.96 mN·m²/g， 38 times， respectively.

Treatment of Wastewater and Recycling from Bio-APMP Process of Poplar Heartwood by Biomimetic Degradation Combined with Biological Treatment

ZHOU Junyi,XIE Yimin,ZHANG Gongxia,NIU Hujun,ZHAO Yunbo,ZHOU Anxiang,XUE Chao — 2024/9/18 16:43:33

The pulping wastewater from alkaline peroxide mechanical pulp （APMP） of poplar heartwood has not only a large quantity， but also high COD， making it difficult to treat. The white rot fungus Trametes sp. 48424 was used to pretreat poplar heartwood， and bioprocessed APMP （Bio-APMP） was obtained by alkaline hydrogen peroxide pulping， which could effectively reduce the content of pollutants in pulping wastewater and improve pulp quality. In this study， the anaerobic biological treatment was carried out with an internal circulation （IC） anaerobic reactor firstly， following by a combination of biological aerated filter （BAF） and biomimetic coagulation for advanced treatment of poplar heartwood Bio-APMP pulping wastewater. The optimum conditions for anaerobic and BAF treatment， as well as the optimum dosage of biomimetic complexes and flocculants were investigated. The effect of wastewater reuse on the performance of Bio-APMP pulping was also explored. The results showed that when the biotechnology of white-rot fungus pretreatment was applied， the COD and lignin content of Bio-APMP pulping wastewater were lower than that of traditional APMP， and the COD_Cr in the pulping wastewater was reduced by 15.3%. At the best anaerobic treatment condition， the removal rate of COD_Cr was 89.5%. The results also indicated that the highest removal rate of COD_Cr in the BAF after process optimizing was 81.9%. When the dosage of Fe-EDTA biomimetic complex was 15 mg/L， the biomimetic coagulation had the best effect on pulping wastewater treatment， and the removal rate of COD_Cr reached 67.7%. By using a combination of anaerobic， BAF， biomimetic treatment， and coagulation for the advanced wastewater treatment， the COD_Cr of Bio-APMP pulping wastewater was reduced from 11952 mg/L to 80.4 mg/L. By reusing the wastewater after advanced treatment into Bio-APMP pulping process， the quality of the pulp was decreased and the physical strength of the paper was reduced.

Effect of Binder Type on Forming and Physical Properties of Heat-not-burn Reconstituted Tobacco Sheets

2024/9/18 16:43:35

Combined with the pulp characteristics of heat-not-burn reconstituted tobacco sheets by thick slurry method， the study investigated the effects of binder type and dosage on the forming and physical properties of reconstituted tobacco sheets. By characterizing the physicochemical properties of tobacco powder and analyzing the Zeta potential and cation demand， the viscosity stability and physical properties of reconstituted tobacco sheets were compared under different dosage of four types of binder： sodium carboxymethyl cellulose， methyl cellulose， hydroxypropyl guar gum and xanthan gum. The results showed that the viscosity of thick slurry increased from 23403 mPa·s to 27546 mPa·s with 3% xanthan gum addition （relative to the absolute dry amount of tobacco powder）， and the homogeneity of reconstituted tobacco sheets was up to 92， the tensile index was 3.55 N·m/g， the tightness was 1.12 g/cm³， and the permeability was reduced to 0.30 μm/（Pa·s）. In addition， when the dosage of xanthan gum was lower than 3% and the hydroxypropyl guar gum was lower than 2%， the stability of heat-not-burn reconstituted tobacco sheets was better， the forming was effectively improved， and physical properties were enhanced.

Study on the Plant Application of Polysaccharide in the Papermaking Process of Paper-process Reconstituted Tobacco Sheet

ZHAO Xinyu,LI Huifan,DONG Gaofeng,ZHOU Guiyuan,LIU Jing — 2024/9/18 16:43:37

In order to study the effect of plant polysaccharides used as wet end additive on the performance of reconstituted tobacco， this study mainly discussed the effects of plant polysaccharides on the pulp retention rate， base sheet physical properties and cigarette product sensory quality of reconstituted tobacco by adding 17 plant polysaccharides to the pulp in the papermaking process of reconstituted tobacco. The results showed that： in terms of pulp retention rate， guar gum （addition amount of 0.8% by mass fraction） had the best effect on pulp retention rate， which was 8% higher than blank sample； in terms of the physical properties of the base sheet， guar gum had a greater enhance effect on the comprehensive physical properties； in terms of sensory quality of the cigarette product， the addition of polysaccharides had a negative effect on the sensory quality of cigarette product， and tamarind seed polysaccharide （addition amount of 0.5% by mass fraction） had the least negative effect.

Effects of Pre-impregnation Soluble Substrates on the Bleaching Performance of Eucalyptus urophylla×E. grandis Mechanical Pulp

2024/3/26 0:00:00

To study the effects of pre-impregnation on the bleaching performance of the pulp， Eucalyptus urophyllax E. grandis mechanical pulp was pre-impregnated via three types of pre-impregnation soluble substrates retention processes at three chemical dosages （NaOH 10 kg/t， NaOH 30 kg/t， NaOH 10 kg/t+H₂O₂ 30 kg/t）. The chemical structure of the three pre-impregnation soluble substrates were compared by elemental analysis and pyrolysis-gas chromatography/mass spectrometry. The results showed that the bleaching performances of pre-impregnated pulps using three processes all had a greater improvement than that of eucalyptus single-stage bleaching pulp. Pre-impregnated soluble substrates produced by pre-impregnation treatment with different chemical dosages could have a negative effect on the bleaching properties of pulps to varying degrees with different retention levels. There was a correlation between the degree of nitrogen dissolution from the pulp and the subsequent improvement of bleaching performance of the pulp.

Study on the Treatment of Wastewater from Bio-CMP Process of Poplar Heartwood by Flocculation Combined with Biological Aeration Filter

NIU Hujun,XIE Yimin,LUO Wenqi,ZHOU Anxiang,XUE Chao — 2024/3/26 0:00:00

In this study， poplar heart-wood were pretreated with the white-rot fungus Trametes sp. 48424. The integrated wastewater generated during chemical-mechanical pulping was treated by combining flocculation and precipitation with a biological aeration filter （BAF）， to study the effect of wastewater reuse on biochemical-mechanical pulping and BAF， and to explore the feasibility of reuse of treated wastewater. The results showed that the use of white-rot fungus pretreatment technology could offset the COD_Cr produced by adding NaOH of 2% （relative to raw material oven dry weight）. The maximum removal rate of COD_Cr after treatment was 49.9%. the maximum removal rate of COD_Cr treated by BAF was up to 91.8%. The effluent COD_Cr was reduced to 39.8 mg/L， which met the standards for reuse and discharge of pulping wastewater. Wastewater reuse would reduce the overall efficiency of the BAF， and the treated wastewater was reused in the pulping system， which would also result in a certain impact on the paper performance. After reuse once， the effluent COD_Cr rised to 76.3 mg/L， so the treated wastewater could only be reused once.

Main Properties and Quality Control Technologies of Dissolving Pulp for Lyocell Fiber Production

2024/3/26 0:00:00

Lyocell is a type of eco-friendly high-performance regenerated cellulose fiber. Its manufacturing technology differs greatly from viscose fiber in principle， process and equipment. The production of Lyocell fiber requires better quality dissolving pulp than that of viscose fiber. The manufacturing process of Lyocell fiber was introduced in this paper firstly. The influence of the chemical compositions of dissolving pulp for Lyocell fiber， macromolecular properties of cellulose， crystalline structure on the production of Lyocell fiber， especially on the dissolution of the dissolving pulp in 4-Methylmorpholine N-oxide Hydrate （NMMO） solvent， were discussed emphasizedly. The main specifications and quality control technology of the dissolving pulp for Lyocell fiber manufacturing were proposed to provide guidance for the research and production of dissolving pulp for Lyocell fiber.

Study on the Cleaning Technology of Silicon Carbide Membrane Purification System for Reconstituted Tobacco Sheet

YAN Ying,LI Huayu,TIAN Xiaohui,WANG Yanqing,ZHANG Litao,ZHOU Hao,DING Hongying — 2024/3/26 0:00:00

The composition of reconstituted tobacco sheet recycled extract was analyzed， the appropriate inorganic acid cleaning agent of silicon carbide membrane purification system for recycled extract purification was screened and determined in this study. The cleaning effect of the inorganic acid cleaning agent at different concentrations were studied.The combination of inorganic acid cleaning agent and alkaline cleaning agent were optimized. A chemical soaking process based on the original cleaning process was added， and the appropriate chemical soaking process was preferentially determined through the comparison of the two types of chemical soaking process. The results showed that： ① there was about 75% of the organic matter in the reconstituted tobacco sheet recycling extract； ② after cleaning by NH₂SO₃H solution with mass fraction of 10%， membrane flux of membrane purification system on production line recovered to 86.05% of the original flux to meet the membrane purification system cleaning needs； ③ the better detergent combination was of NH₂SO₃H solution with mass fraction of 6% and NaOH solution with mass fraction of 6%； ④ the suitable chemical soaking process conditions were that NaOH solution with mass fraction of 10%， started lye pump every 4 h with running for 1 h， chemical immersion total time for 24 h. After optimization， the operating cycle of the membrane purification system of reconstituted tobacco sheet production line was increased to 14.0 h， and the membrane flux recovery ratio was increased to 94.00%， and the daily chemical cleaning consumption time was reduced to 89 min.

Research Progress of Effects of Chemical Components of Reconstituted Tobacco Sheet Coatings on Sensory Quality

2024/3/26 0:00:00

The content， action mechanism， pyrolysis products and coordination of each chemical component of reconstituted tobacco sheet coatings were discussed in this paper. The effects of chemical components of reconstituted tobacco sheet coatings on sensory quality were elaborated in detail. At the same time， this paper also provided advice on innovative adding methods and optimizing production process for tobacco enterprises to improve the stability and coordination of the chemical composition of reconstituted tobacco sheet coatings in the future.

Study on Improving the Physical Properties of Heat-not-Burn Reconstituted Tobacco Sheet

2024/3/26 0:00:00

Heat-not-burn reconstituted tobacco sheet is a new type of reconstituted tobacco sheet， and its preparation methods mainly include slurry processed， roll pressing and papermaking. A certain amount of wood pulp fiber should be added to ensure that the reconstituted tobacco sheet has good forming and processing resistance. In this study， the application of wood pulp fibers with different refining degrees in the preparation of heat-not-burn reconstituted tobacco sheet by slurry processed method was studied， and the effects of wood pulp fibers on the slurry properties and physical properties of reconstituted tobacco sheet were investigated. The results showed that increasing the refining degree of wood pulp fibers was beneficial to the decrease of thick pulp’s viscosity. When the refining degree of wood pulp fibers was 49 °SR， the strength properties of heat-not-burn reconstituted tobacco sheet were relatively better. The strength properties of wood pulp increased with the increase of wood pulp content from 2% to 5%， and the highest tensile index reached 3.62 N·m/g.

Investigation into the Energy Consumption-Strength Mechanism of Alkali-Enzyme Synergistic Pretreatment for Optimizing Eucalyptus High-yield Pulp

2025/12/24 22:01:58

This study systematically investigated the mechanism by which alkali-enzyme synergistic pretreatment affected the properties and dissociation energy consumption of eucalyptus CTMP. The experimental results indicated that under optimal alkali-enzyme synergistic pretreatment conditions （NaOH dosage of 6%， cellulase dosage of 8 FPU/g）， pulp properties were significantly improved， and refining energy consumption was substantially reduced. When the pulp freeness reached 150 mL， the energy consumption of the alkali-enzyme synergistic pretreatment was 1 104.01 kWh/t， significantly lower than that of the single alkali pretreatment （1 498.68 kWh/t）， and 32.2% lower compared to mechanical refining （1 627.81 kWh/t）. Meanwhile， the tensile index （24.4 N·m/g） and bursting index （1.29 kPa·m²/g） of the paper formed via alkali-enzyme synergistic pretreatment increased by approximately 32% and 46%， respectively， compared to the paper formed via mechanical refining （18.5 N·m/g and 0.883 kPa·m²/g）. However， the strength properties were slightly reduced compared to the paper formed via single alkali pretreatment. The mechanistic studies revealed that the reduction in refining energy consumption with alkali-enzyme synergistic pretreatment was primarily attributed to the dissolution of lignin and hemicellulose by alkali treatment， which disrupted the lignin-carbohydrate complex structure and caused fiber swelling. The subsequent enzymatic treatment further dissolved part of the cellulose and hemicellulose， increased fiber porosity， and loosened the fiber structure， thereby facilitating fiber separation. The slight decline in the strength properties of the paper formed via alkali-enzyme synergistic pretreatment was related to the dissolution of carbohydrates on the fiber surface during the enzymatic treatment process.

Study on Simultaneous Removal of Lignin and Silica from Wastewater of Wheat Straw High-yield Pulp and Subsequent Treatment Approach

2025/12/24 22:02:00

This study investigated the simultaneous removal of lignin and silicon from wastewater of lab-simulated wheat straw high-yield pulp using aluminum sulfate flocculation to mitigate the inhibition of lignin on anaerobic digestion and the interference of silicon during combustion of concentrated high-yield pulping wastewater. The feasibilities of two treatment pathways of evaporation combustion and anaerobic digestion for the flocculated wastewater were evaluated. The results showed that under experimental conditions with aluminum sulfate dosage of 0.25~4.0 g/L and final pH value of wastewater of 5~10， wastewater turbidity removal rate exhibited highly linear correlations with both lignin and silicon removal rates. The optimal removal efficiencies of lignin （80.7%） and silicon （53.7%） were achieved at aluminum sulfate dosage of 2.5 g/L and final pH value of wastewater of 7. After coagulation， the biodegradability， methane production rate， and cumulative methane yield of the wastewater increased by 39.4%， 60.5%， and 25.4%， respectively， compared to the raw wastewater. Moreover， the viscosity of the wastewater concentrated to 20% solid content was reduced by 73.9%. Based on the 1 000 kg of wastewater， the combustion heat obtained via the evaporation-combustion pathway （51.22 MJ） was higher than that from methane combustion via anaerobic digestion （37.60 MJ）， indicating that evaporation combustion was the preferable treatment option under these conditions.

Statistical Analysis on the Bleachability of Chemi-mechanical Pulp Based on Raw Material Characteristics

2025/12/24 22:02:01

This study investigated 11 eucalyptus and 5 acacia wood species， employing multiple statistical models (including multivariate linear regression， exponential models， and quadratic transformation models) to analyze the correlations between material characteristics (β-β structural unit content， original pulp brightness) and bleachability under two pre-impregnation dissolved substance treatment processes (full-wash and full-retention). The results demonstrated that β-β structural unit content exhibited a significant negative correlation with bleachability， while original pulp brightness showed a positive correlation in all raw materials. The full-wash process achieved superior model fitting performance compared to the full-retention process. Specifically， the quadratic transformation model for eucalyptus under the full-wash process yielded a determination coefficient (R²) of 0.90， indicating that β-β structural unit content and original pulp brightness significantly influenced bleachability. In contrast， the full-retention process showed poorer model performance (R²<0.66)， suggesting that retained pre-impregnation dissolved substances weakened the explanatory power of material characteristics on bleachability. Additionally， eucalyptus and acacia exhibited synergistic modeling potential， as the inclusion of acacia data did not significantly compromise model accuracy.

Research on Improving the Resistance Properties of Thin Paper with Polyvinyl Alcohol Nanocomposite Coating

2025/12/24 22:02:03

In order to overcome the oxygen and moisture resistance defects of paper as a barrier packaging material， the effects of different nano pigments including 3 kinds of flaky nanomaterials (montmorillonoid， platey kaolins， layered double hydroxide)， and 1 kind of spherical nanomaterial (silica) on the oxygen and moisture resistance performances of the thin paper were explored in this study， and thin paper with high tightness was used as the substrate and composite coatings composed of different nano pigments and PVA were used as the functional coating. The results showed that when the dosage of nano platey kaolin with high aspect ratio and flaky shape was 10 parts， the best resistance performances were achieved with oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) reaching 76.6 cm³/(m²·24 h) and 189.3 g/(m²·24 h)， respectively， which had decreased by 97% and 9%， compared to the base paper’s 2 520 cm³/(m²·24 h) and 207.3 g/(m²·24 h). The PVA/nano pigments composite coatings containing different dosages and forms of nano pigments could significantly improve the oxygen resistance performance of thin paper， but the improvements in moisture resistance performance were limited. When the same dosage of nano pigments was used， the OTR values of composite coatings containing nano platey kaolins， nano montmorillonite， nano layered double hydroxide， and nano silica were 76.5， 73.5， 50.2， and 90.2 cm³/(m²·24 h), respectively， with WVTR values of 189.3， 187.2， 185.6， and 197.3 g/(m²·24 h), respectively.

Study on Foaming Characteristics of Surfactants and Their Effects on Foam-formed Paper Properties in Plant Fiber Systems

2025/12/24 22:02:04

Using bleached softwood pulp as the fiber raw material and surfactants as foaming agents， a foam-molded paper with basis weight of (100±2) g/m² was prepared by foam forming technology and flat drying method. The foaming properties of three surfactants like sodium dodecyl sulfate (SDS)， cetyltrimethylammonium bromide (CTAB)， and fatty alcohol polyoxyethylene ether (AEO-9) were investigated， as well as their effects on paper properties. The results showed that the three surfactants exhibited different foaming characteristics， with optimal foaming concentrations of 1.0 g/L for AEO-9， 0.5 g/L for CTAB， and 1.5 g/L for SDS. At pulp beating degree of 20 °SR， the paper prepared by foam forming with AEO-9 showed that the evenness index increased from 51.9 to 85.2， and the bulk increased from 3.95 to 5.43， with increase of 64.2% and 37.5%， respectively， compared to traditional formed paper.

Study on the Influence Mechanism of Starch Enzymatic Hydrolysis Efficiency on the Enhancement Effect of Corrugated Base Paper

2025/12/24 22:02:05

The purpose of this study was to find out the correlation mechanism between the strength properties of paper made of cellulose-based OCC secondary fibers and the viscosity， average molecular weight， and amylopectin content of starch glue obtained by amylase enzymatic hydrolysis. It was determined the most suitable range of starch glue parameters to improve the strength properties of paper， so as to provide guidance for paper mills to achieve rapid enzymatic hydrolysis and meet sizing agent requirements. The results showed that the corn starch glue solution obtained by enzymatic hydrolysis at a holding temperature of 78 ℃ and α-amylase dosage of 0.10~2.00 U/g (50~1 000 mL/t) could increase the strength properties (tensile strength and ring-crush-resistance) of the single-sized paper by over 15% compared to the base paper， and the average molecular weight， amylopectin content， and viscosity of starch glue were 2×10⁴~4.3×10⁵ g/mol， 56%~77%， and 3.35~138.26 mPa·s， respectively. In order to be suitable for continuous sizing in paper mills， the range of viscous average molecular weight， amylopectin content， and viscosity of starch glue solution should be further reduced， which were 1.3×10⁵~2.7×10⁵ g/mol， 63%~76%， and 10~30 mPa·s， respectively. At the same time， the correlation between enzymatic hydrolysis time and starch glue parameters and paper strength enhancement showed that under conditions of α-amylase dosage 0.24 U/g (120 mL/t) and hydrolysis time of 10 min， the starch glue solution exhibited optimal paper strength enhancement effects， with tensile strength and ring-crush-resistance of paper increasing by 21.2% and 26.4% respectively compared to the corrugated base paper. The viscosity， amylopectin content， and viscous average molecular weight of starch glue were all in line with the inference interval.

Effects of Main Component on the Physical Properties of Reconstituted Tobacco Sheets Prepared by Thick Slurry Process

YAO Jianwu,LI Pan,YU Shitao,WANG Wanxia,LI Dan,LIN Jie,HUANG Minhui,YANG Nan — 2025/12/24 22:02:08

The elasticity， fracture strength， surface adhesive property， tribological property of reconstituted tobacco sheets with different atomizer additive amounts and fiber contents processed by thick slurry process were analyzed， and compared with end product samples in this research. The effects of water， glycerol， and propylene glycol of the reconstituted tobacco sheets on their microstructure and physical properties were explored. The results indicated that an increased additive amount of atomizer led to higher equilibrium moisture content of the reconstituted tobacco sheets， enhancing structural uniformity， which in turn resulted in increased surface adhesion and reduced tensile and shear strength in both transverse and longitudinal directions. A higher fiber content within the reconstituted tobacco sheets resulted in greater porosity and increased roughness， significantly augmenting the tensile and shear strength as well as the dynamic coefficient of friction in both directions. The tensile and shear fracture strength were positively correlated with fiber content and arrangement direction. The surface adhesive property were mainly related to the glycerol content， with the grey correlation degree around 0.88. The reconstituted tobacco sheets with higher surface roughness had higher dynamic friction coefficients.

Factors Affecting the Retention of Calcium Carbonate in Reconstituted Tobacco Sheets

2025/12/24 22:02:10

To investigate the influencing factors on the retention performance of calcium carbonate in reconstituted tobacco sheets， this study employed CO₂-treated ion chromatography to measure the calcium carbonate content in base sheets produced via different papermaking processes. Subsequently， the study analyzed the effects of calcium carbonate addition ratio， fiber beating degree， pulp blending process， and other factors on calcium carbonate retention and the physical properties of the base sheets. The results showed that as the calcium carbonate addition ratio increased from 5% to 20%， its retention rate dropped by 58.7%. Meanwhile， compared to base sheets without calcium carbonate addition， the bulk rose by 7.3%， while the tensile index declined by 13.1%. As the proportion of tobacco fine pulp in the tobacco pulp blend rose from 10% to 90%， the calcium carbonate retention rate decreased by 23.1%. When the beating degree of the tobacco pulp increased from 23 °SR to 71 °SR， the calcium carbonate retention rate rose by 54.9%. As the addition ratio of external fibers increased from 0 to 20%， the calcium carbonate retention rate improved by 29.5%； when the beating degree of external fibers increased from 26 °SR to 76 °SR， the calcium carbonate retention rate first increased and then decreased. As the guar gum addition ratio increased from 0 to 0.3%， the calcium carbonate retention rate surged by 236.1%， while the bulk and tensile index of the base sheets decreased by 5.7% and 28.1%， respectively. Additionally， as the basis weight of the base sheets increased from 48.7 g/m² to 84.4 g/m²， the calcium carbonate retention rate first rose and then declined， the bulk dropped by 36.8%， and the tensile index increased by 46.6%.

Lightweight Paper Defect Detection Model Based on Re-parameterization and Mutile Query Self Attention

LIU Xin,ZHOU Qiang,CHEN Yaxin,ZHANG Xiaohui — 2025/12/24 22:02:10

To address the challenges in existing deep learning algorithms， which struggle to balance detection accuracy and speed in paper defect detection， leading to the limited practicality of machine vision-based systems， this paper proposed a lightweight paper defect detection model named RepLite-YOLO based on re-parameterization and mutile query self attention. First， a lightweight partially depthwise separable convolution was designed to reduce model complexity. On this basis， the RCNXC2f module was constructed to enhance the model’s capability of extracting multi-scale features， with re-parameterization employed to reduce computational costs during inference. Subsequently， the C2PMQA module was integrated into the tail of the backbone network to improve the refinement of global features. Finally， a lightweight detection head module was developed， incorporating a training strategy without Non-Maximum Suppression (NMS) to effectively enhance real-time detection performance. Experimental results on a self-constructed paper defect dataset demonstrated that the proposed RepLite-YOLO achieves a mean Average Precision (mAP) of 99.2%， with a model size of only 1.35 MB. On the NVIDIA 4060 platform， the model achieved a frame rate of 175 FPS for 512×512 resolution paper defect images. RepLite-YOLO model not only ensured the precision of paper defect detection， but also outperformed other paper defect detection models in terms of real-time performance.

Research Progress on the Influence of Cellulose Coating on the Barrier Properties of Paper-based Food Packaging Materials

2025/6/25 12:48:49

The disordered pore structure and hydrophilicity of paper-based materials result in high gas permeability， limiting their widespread application in the food packaging industry. Cellulose with the excellent film-forming properties， outstanding biocompatibility， and good strength performance， demonstrate high-value application potential in the field of barrier materials. This paper reviewed the preparation processes and physicochemical properties of cellulose and its derivatives （nanocellulose， modified cellulose， and regenerated cellulose）， and conducted an in-depth analysis of their barrier mechanisms and current issues when used as coatings for paper-based food packaging materials. It focused on the influence of factors such as chemically modified cellulose coating， cellulose/nano-filler composite coating， paper-based material structure， coating structure， and coating methods on the barrier performance of cellulose coatings， and proposed future research directions and development trends for cellulose-coated paper-based food packaging materials.

Study on the Preparation of Aramid Fiber/Molecular Sieve Paper-based Filtration Material and Its Filtration Properties

LI Siqi,LU Zhaoqing,JIA Fengfeng,HUA Li,XU Mingyuan,HUANG Tao,ZHAO Huimei — 2025/6/25 12:48:50

Using para-aramid pulp/meta-aramid precipitated fiber as the three-dimensional supporting skeleton， of which the para-aramid pulp surface was activated by the DMSO/KOH/H₂O system， and 4A type molecular sieve as the adsorbent， the aramid fiber/molecular sieve paper-based materials were prepared via wet forming by compounding para-aramid pulp， meta-aramid precipitated fiber and molecular sieve. The results showed that when the mass ratio of para-aramid pulp， meta-aramid precipitated fiber did not be changed， and molecular sieve additive amount was 1.5 g， the prepared aramid fiber/molecular sieve paper-based material had the best comprehensive performance， with breaking stress of 8 MPa， air permeability of 35 μm/（Pa·s）， and removal rate towards PMs and formaldehyde of 99.99% and 93.17%， respectively.

Research on Material Analysis of Mica Paper of the Ming Copy of Wen Yuan Ying Hua

LYU Shuxian,WANG Kai,YI Xiaohui,KANG Baoqiang,WANG Xu,ZHANG Yanxia — 2025/6/25 12:48:51

Using various scientific detection methods such as optical microscopy （OM）， fiber dyeing analysis， field emission scanning electron microscopy-energy dispersive spectroscopy （FESEM-EDS）， micro X-ray diffraction （micro-XRD）， and attenuated total reflection Fourier transform infrared spectroscopy （ATR-FTIR）， this study conducted comprehensive analyses to the paper of the Ming handwritten edition Wen Yuan Ying Hua in LI Shengduo’s book collection. The results showed that the paper used in this book was muscovite filler paper made of paper mulberry bark， which indicated that it should be a type of “mica paper” from the Ming Dynasty. Besides， its manufacturing process could be speculated to be made by adding mica to the pulp， which differed significantly from the ancient traditional handmade mica paper prepared by coating as recorded in literature， as well as modern handmade mica Xuan paper and machine-made mica paper.

Application of α-Amylase or α/β-Compound Amylase Hydrolysed Corn Starch in Surface Sizing of Corrugated Base Paper

2025/6/25 12:48:52

The enzyme hydrolyzed corn starch glue （EH starch glue） applied to the surface sizing of corrugated base paper， was prepared by adjusting the dosage ratio and addictive amount of single α-amylase and α/β-compound amylase， as well as the enzymatic hydrolysis temperature. By measuring the viscosity and combining with the performance indexes of sized paper such as tensile strength， ring compression strength and attached adhesion amount， to analyze the feasibility of the bio-enzymatic hydrolysis of corn starch sizing agent in improving sized paper strength. The results showed that the α/β- compound amylase hydrolysis process had a more obvious improvement effect for the EH starch glue to enhance the paper strength performance than single α-amylase. The synergistic effect of α/β-compound amylase could better control the enzymatic hydrolysis rate of starch and obtain EH starch glue with viscosity suitable for surface sizing. Under the enzyme hydrolysis process parameters that enzyme hydrolysis temperature was 60 ℃， α-amylase and β-amylase dosage was 90 mL/t and 30 mL/t， respectively， the tensile and ring compression strength properties of the sized paper by EH starch glue were 8.94 kN/m and 2.31 N/mm， which were 20.7 % and 31.8 % higher than that of corrugated base paper， respectively.

Research Progress of Natural Polysaccharides Retention Aids for Reconstituted Tobacco Sheets

2025/6/25 12:48:56

The raw materials of reconstituted tobacco sheets contain a large number of fine fibers， fragments and mineral fillers， which are easy lost during papermaking processing， increasing raw material consumption and water treatment load， and affecting the quality of reconstituted tobacco sheets. Natural polysaccharides have the properties of chemical stability non-toxicity， and biodegradability， and can be used as retention aids for reconstituted tobacco sheets. In this paper， the natural polysaccharide retention aids currently used in reconstituted tobacco sheets， including unitary， binary and multivariate retention aid systems were reviewed. The mechanism and effect of natural polysaccharide retention aids were discussed from the perspective microstructure.

Study of AKD Neutral-internal Sizing for the Preparation of High Durability Sized Xuan Paper

2025/6/25 12:48:57

Alkyl ketene dimer （AKD） was used as an alternative to the conventional acid rosin/gum alum surface sizing system for neutral internal sizing of Xuan paper， in order to improve the durability of sized Xuan paper. Using the Actinidia chinensis planch. juice as the dispersant， the AKD-sized Xuan paper was prepared. This study investigated the interaction between AKD sizing and dispersion of Actinidia chinensis planch. juice， and determined the process sequence of sizing and dispersion. In addition， the intermittent production process of Xuan paper was simulated through batch replenishment pulp experiments， and the stability of AKD-sized Xuan paper in terms of acid-base properties， color， hydrophobic and ink-repellent was comprehensively evaluated in conjunction with wet-heat aging test. The results showed that Actinidia chinensis planch. juice caused AKD flocculation and adsorption on the surface of fibers， and the additive process of AKD sizing first， followed by dispersion of Actinidia chinensis planch. juice， could reduce the adverse effects of AKD on the whiteness and formation of paper. The surface properties of AKD-sized Xuan paper were basically stable during intermittent production， and its hydrophobic and ink-repellent properties and physical properties reached or exceeded those of commercially available sized Xuan. AKD-sized Xuan paper had a higher pH value and alkali reserves than that average value of commercially available sized Xuan by 0.8 and 55.6%， respectively. After wet-heat aging， the pH value and alkali reserve retention rate of AKD-sized Xuan paper were higher than that average value of commercially available sized Xuan by 1.4 and 21.8%， and the yellowing value and color difference value were lower than those of commercially available sized Xuan by 8.2% and 21.8%， respectively， and the physical properties were more stable.

Research Progress on the Application of Electrostatic Spinning Encapsulation of Plant Essential Oils in Food Active Packaging

ZHANG Tingting,HUI Lanfeng,LIU Zhong,XIN Jieting,ZHAO Yumeng — 2025/6/25 12:48:58

Development of safe and effective food active packaging materials is currently an important development trend in the food field. Plant essential oils can be used in food active packaging due to their natural antibacterial and antioxidant properties. Encapsulation of EOs by the electrostatic spinning method can improve the odor of essential oils， maintain their chemical stability， reduce their oxidative and volatility， and at the same time confer them with a slow-release property， so as to better utilize the efficacy of EOs in food active packaging. This paper reviewed the principle of electrostatic spinning technology and the preparation of electrostatic spun fibers encapsulating EOs， the types of EOs and electrostatic spinning raw materials commonly used in food active packaging by the electrostatic spinning method were classified and described in detail， as well as the applications of electrostatic spun fibers encapsulating EOs in food active packaging was outlined.

Study on the Antioxidant Activity of Chemi-mechanical Pulp Pre-impregnated Residue and Its Application Prospect in Food Field

2025/3/26 12:55:56

Antioxidant activity of the eucalyptus chemi-mechanical pulp pre-impregnated residue （PR） recognized as waste was studied， and its application prospect in food field was explored. The effects of pre-impregnation conditions （NaOH dosage， temperature and pulp concentration） on the PR antioxidant activity and yield were investigated. The difference in the PR chemical structure at various NaOH dosage was studied. The conformational relationship between the PR composition structure and the antioxidant activity was established. The thermal stability， antioxidant activity after high-temperature treatment and cytotoxicity were also used as the evaluation indexes to evaluate the application performance of PR in the food field. The results showed that the NaOH dosage was the main factor affecting the antioxidant activity and yield of the PR， and the less the NaOH dosage， the lower the yield and the stronger the antioxidant activity of PR. PR fabricated at NaOH dosage of 0 （R0） had the best antioxidant activity with highest DPPH free radical scavenging rate of 82.63%. It was also found that R0 had good thermal stability， and could maintain 84% of the initial level after 1 h of thermal treatment at 200 ℃. Moreover， PR had no cytotoxicity to HepG2 cells at a concentration of 100 μg/mL， which met the basic requirements for food applications. The quinone-type conjugate structure was the main reason for strong antioxidant activity of PR. When the NaOH dosage was at a high level （30 kg/t）， the content of quinone of PR decreased significantly， and thus led to a decreased antioxidant activity.

Study on Preparation of Anti-adhesion Paraffin/Silica Coating for Paper and Properties of Coated Paper

LI Junwei,AN Xingye,LU Bin,CHENG Zhengbai,CAO Haibing,LIU Hongbin — 2025/3/26 12:55:57

In this study， an environmentally friendly and efficient anti-adhesion coating for paper using food-grade raw materials were developed， specifically paraffin and fumed silica. The effects of coating amount， the mass ratio of paraffin to modified fumed silica nanoparticles （HSNPs）， and heat treatment temperature on the wettability of the coated paper were investigated. Additionally， the mechanical properties， acid and alkali resistance， and anti-adhesion characteristics of the coated paper were examined. The results indicated that when the coating amount was 8 g/m²， the mass ratio of paraffin to HSNPs was 1∶5， and the heat treatment temperature was 120 ℃， the paraffin/HSNPs coated paper retained its superhydrophobic properties even after undergoing 12 friction cycles， 6 000 water drop impacts， and 20，000 bending tests， etc., respectively. After paraffin/HSNPs coating was applied to paper cups， the coated paper cups could exhibit excellent anti-adhesion effects against various viscous liquids.

Study on the Effect of External Fiber Types and Beating Methods on the Properties of Reconstituted Tobacco Sheets

DONG Gaofeng,ZHOU Guiyuan,LIU Jing,LI Huifan,HU Weiyao,LIU Mengru,GU Pengkun — 2025/3/26 12:55:59

This study selected six types of external fibers and implemented differentiated beating processes according to their fiber characteristics. The impacts of classified beating on fiber properties， hot water-soluble content and physicochemical properties of reconstituted tobacco sheets， as well as sensory quality of cigar were systematically evaluated to identify the optimum external fiber type. The results demonstrated that the reconstituted tobacco base sheets prepared through classified beating exhibited superior flatness， improved bulk and formation uniformity with reduced two-sided variation. The surfaces showed minimal visible large particles， facilitating uniform distribution and vertical penetration of coating solutions. The optimized base sheets incorporating Manila hemp pulp with beating degree of 43 °SR as external fibers developed a refined pore structure characterized by increased quantity and reduced pore size， enhancing both permeability and retention uniformity of coating solutions. Post-optimization characterization showed that the reconstituted tobacco sheets displayed a notable thickness increase approaching double that of base sheets， accompanied by significantly enhanced cross-sectional porosity.

Research on the Impact of Various Aroma Components in Reconstituted Tobacco Sheets on Sensory Quality

2025/3/26 12:56:00

This paper systematically elaborated the influence of various aroma components in reconstituted tobacco sheets on sensory quality during combustion and inhalation， focusing on their physicochemical properties， pyrolytic behaviors， and functional mechanisms. It comprehensively reviewed the effects of process parameters， raw material sources， and conventional chemical components on the content and release kinetics of aromatic substances in reconstituted tobacco sheets. This paper provided novel insights for optimizing flavoring processes and enhancing the aromatic profile of reconstituted tobacco sheet through multi-dimensional analysis of critical technical parameters and raw material compositions.

Study on Chlorine Dioxide Bleaching Process Based on Chemical Reaction Network Hierarchical Analysis Method

AN Jing,CHEN Bo,MAN Yi — 2025/3/26 12:56:00

ClO₂ as an efficient bleaching agent， is widely used in pulp and paper bleaching processes. The interaction between lignin and ClO₂ involves a complex reaction mechanism that poses significant challenges in terms of precise control over the reaction process. Among them， the chlorination reaction occurring between lignin and chlorine-containing compounds leads to the generation of adsorbable organic chlorides （AOX）， which not only compromise the quality of paper， but also contribute to environmental pollution. Therefore， this study took the lignin model compounds methoxycresol and ClO₂ as the research objects. By analyzing the main oxidation and chlorination products and yields of lignin reacting with ClO₂， combing with relevant reaction mechanisms， 19 main chemical reactions were extracted， and a chemical reaction network containing 20 nodes and 43 directed edges was constructed. Utilizing the node centrality index， the key nodes transmitted in the chemical reaction network were identified， and the critical path of AOX formation during the bleaching process was revealed， through the hierarchical division and structural analysis of the chemical reaction network.

Study on Preparation and Properties of Flexible X-ray Shielding Paper Based on Multi-scale Aramid Network of PMIA/AF/ANF Loaded with CsPbBr₃

XING Jialong,SONG Shunxi,ZHANG Jingru — 2026/6/18 21:51:31

In this study， a macroscopic framework was constructed using long para-aramid （PMIA） fibers， while aramid precipitated fibers （AF） were employed to bridge and toughen the PMIA fibers at the micrometer scale. Furthermore， aramid nanofibers （ANF） were used to form a nano-bonding/coating phase. Using a wet-forming process， the PMIA/AF/ANF multi-scale aramid networks were combined with the all-inorganic perovskite CsPbBr₃ to create X-ray shielding paper， achieving uniform dispersion and stable loading of CsPbBr₃ particles within the paper. The effects of CsPbBr₃ addition amount （27%~65%） on the paper’s morphology， mechanical properties， and X-ray shielding performance were systematically investigated. The results showed that adding an appropriate amount of CsPbBr₃ significantly enhanced the attenuation capacity of X-ray shielding paper while maintaining the continuity of the aramid paper. When the CsPbBr₃ addition amount was 53%， the prepared CPAA-3 achieved X-ray attenuation efficiency of 58%~72% at tube voltage of 20~70 kV， with a tensile strength of 57.6 MPa and a density of only 1.08 g/cm³， which was far lower than that of traditional lead-based materials. The prepared X-ray shielding paper in this study combined the advantages of light weight， flexibility， and high-efficiency shielding. Its enhanced shielding performance was primarily attributed to the complementary K-edge absorption effects of Cs and Pb， as well as the enhanced multiple scattering of X-rays by the porous structure of the aramid paper.

Study on the In-situ Bacterial Cellulose Synthesis Modification of Sludge Based on Distiller’s Grains Enzymatic Hydrolysate and Its Application as a Paper Filler

WU Zhiyi,WEI Lingjun,ZHOU Jiawei,YAN Xinchi,SUN Hao,WANG Changkun,DU Tiantian — 2026/6/18 21:51:32

In this study， enzymatic hydrolysate of distiller’s grains was used to drive kombucha bacteria to in-situ construct bacterial cellulose (BC) networks on the surface of river silt， to prepare a green and low-cost papermaking fillers， and investigating its application effect in paper. The results showed that the composite filler (EW-BC/SP) prepared with the distiller’s grains enzymatic hydrolysate medium achieved a BC loading of 109.1 mg/g， exhibiting an excellent BC loading capacity with superior in-situ modification performance compared with the traditional medium group (68.6 mg/g). When the filler dosage was fixed at 40%， the retention rate of EW-BC/SP in paper reached as high as 88.2%， which was significantly higher than that of SP group (54.7%). The tensile index of the paper added EW-BC/SP reached 31.2 N·m/g， which was 30.6% higher than that of SP group， and the burst index was 1.81 kPa·m²/g， showing basically no difference from SP group， and demonstrated the remarkable enhancement effect of the BC network.

Study on the Effects of Bone Glue-Alum Solution Ratios on the Surface Morphology， Physical Structure, and the Expressiveness of Ink Marks of Xuan Paper

2026/6/18 21:51:34

In this study， the bone glue-alum solution with different ratios used as sizing agents， and the traditional drag-dye sizing technology was employed to produce Xuan papers sized bone glue-alum， and the surface morphology， pore structure， contact angle， and other characteristics were systematically analyzed to explore the effects of the bone glue-alum solution ratios on the morphology and color of ink marks during calligraphy creation. The results showed that bone glue-alum solution affected the surface morphology and physical structure of Xuan paper by filling its porous structure， thereby influencing the expressiveness of ink marks in calligraphy creation. Under different ratios， there were significant differences in the hydrophobicity and the expressiveness of ink marks of Xuan paper sized with bone glue-alum. When the mass fraction of alum was 1.0% and the mass fraction of bone glue was 1.0% or 1.5%， the ink sensitivity of Xuan paper sized with bone glue-alum was better. When the mass fraction of bone glue was 2.0%， and the mass fraction of alum was 1.0% or 1.5%， the Xuan paper sized with bone glue-alum was more suitable for thick ink. For the Xuna paper sized with alum and no glue， the positively charged alum adsorbed ink particles faster， leading to uneven ink diffusion. The experimental results of ink marks were basically consistent with the writing experience， indicating that the factors affecting the writing experience could be mapped to measurable physical structure， providing a certain reference for calligraphers to choose and for manufacturers to process Xuna paper sized with bone glue-alum.

Synthesis of Calcium Carboaluminate and Its Mechanism of Silicon Removal from Green Liquor at High Temperature

LI Xin,LAN Jinxin,CAI Yuanyuan,MA Xiaojuan,CAO Shilin — 2026/6/18 21:51:35

In this study， calcium aluminate carbonate （CHAC）， a highly efficient desilication agent was synthesized， which was suitable for high-temperature green liquor systems. Its synthesis process and desiliconization conditions were systematically optimized. The results showed that under conditions of a synthesis time of 75 min， a synthesis temperature of 45 °C， and a molar ratio of CaO， NaAlO₂， and Na₂CO₃ of 2∶1∶1， the prepared CHAC exhibited a rich layered structure， high crystalline water content （14.1%）， and a large specific surface area （8.21 m²/g）， with silicon removal performance significantly superior to that of other desilication agents. When the molar ratio of CHAC to silicon was 1∶0.8 and the silicon removal time was 1 h， the silicon removal rate could reach 80.1%， and the settling time could be controlled within 10 min. The Ca²⁺ and Al³⁺ in CHAC form Ca—O—Al complexes that reacted with SiO₃²⁻ in the green liquor to generate insoluble calcium silicoaluminate precipitates （primarily composed of 2CaO·Al₂O₃·2SiO₂）， thereby achieving efficient silicon removal.

Research Progress of Transparent Paper-based Materials for Windows

GUO Gang,LI Junbing,WANG Xiwen — 2026/6/18 21:51:36

In this paper， the diverse preparation routes and modification methods of transparent paper-based materials for windows were systematically reviewed， the performance characteristics and requirements of these materials in various application fields were summarized. The bottlenecks in current technology was analyzed， and an outlook on the future development directions of high-performance， multi-functional transparent paper-based materials for window was provided. It aimed to offer a reference for the further promotion and application of these materials.

Technological Advances in the Production of Dissolving Pulp from Cotton Linters and Waste Cotton Textiles

WANG Ziwei,ZHONG Huiyan,WANG Xiyue,MA Shengjuan,ZHANG Gangqiang — 2026/6/18 21:51:38

This paper reviewed the technological advances of preparing dissolving pulp from cotton fibers， and discussed the differences in the characteristics of two types of raw materials with cotton linter and waste cotton textiles， along with their effects on the dissolving pulp pulping process. From the perspective of the key quality indicators system and range of dissolving pulp， a comparative discussion was made on the traditional and modern pulping methods for cotton linter， as well as the decolorization processes for waste cotton textiles including oxidative decolorization， reductive decolorization， and enzymatic decolorization. The diversified development of dissolving pulp and regenerated fiber preparation technology was summarized， with the aim of providing a reference for the high-value utilization of waste cotton textiles.

Research Progress on the Application of Biological Enzymes in the Optimization of Pulping and Papermaking Process

ZHANG Zhaochi,GUO Mengxia — 2026/6/18 21:51:38

Biological enzyme is a natural and efficient catalyst， which provides important support for the green transformation of pulp and paper industry. This paper introduced the commonly used biological enzymes in pulping and papermaking process， including laccase， lipase， amylase， cellulase and hemicellulase， and analysed their mechanism of action， respectively， focusing on the application effect of these enzymes in the key steps of pulping and papermaking process （beating， bleaching， deinking of waste paper， wastewater treatment， etc.）. The pulp and paper industry could move toward a more environmentally friendly and sustainable future by the methods of combining different biological enzymes， using intelligent technologies to control enzymatic processes， and better integrating enzyme technology into existing pulping and papermaking process.

Establishment and Application of Theoretical Model of In-plane Compressive Plateau Stress in Corrugated-Honeycomb Composite Cardboard

CHANG Bingbing,ZHANG Min,CHEN Qingguo,QIAN Jing — 2026/6/18 21:51:39

To address the issue of weak bearing capacity of traditional honeycomb cardboard under in-plane compression， a three-layer composite cardboard with a "corrugated-honeycomb-corrugated" structure was innovatively designed and prepared in this study. In-plane quasi-static compression tests were conducted to explore the deformation mechanism of each layer of the composite cardboard. Typical folding units were selected， and based on the corner unit energy dissipation theory， the energy dissipation mechanism of each layer structure was revealed. A theoretical model for the plateau stress of the composite cardboard was established. Comparative tests were carried out on three types of corrugated-honeycomb composite cardboards with different structural parameters. The results showed that the relative error between the theoretical predicted values and the experimental test values ranged from 3.36% to 8.49%. On this basis， the effects of material and structural parameters on the plateau stress was systematically analyzed by using the established theoretical model， and the action mechanism of each parameter was clarified.

Study on the Morphological and Structure of Three Broussonetia Phloem Fibers

LIU Xiaoyu,LIU Mengru,LI Hailong,XIAO Yuying,LIU Ying — 2026/3/20 12:41:00

This study systematically measured the morphological and structural characteristics of three Broussonetia （Broussonetia kaempferi Siebold， Broussonetia papyrifera， Broussonetia kazinoki） phloem fibers， including basic morphology， surface features， and microfibril angle，and comparatively analyzed the commonalities and differences in fiber morphology and structure among these three species. The results showed that the three Broussonetia phloem fibers exhibited high similarity in fiber morphology and structure. In terms of basic morphology， the three Broussonetia phloem fibers were generally slender， with aspect ratio exceeding 180. Among them， the aspect ratio of the fibers of Broussonetia kazinoki was the largest of 265. In terms of surface morphology， the cell wall thickness and wall-to-lumen ratio of the three Broussonetia phloem fibers were relatively large， and there were obvious longitudinal wavy folds and transverse grooves on the fiber surface. Besides， the average microfibril angles of the three Broussonetia phloem fibers were relatively small， at 7.14°， 7.66°， and 7.32°， respectively. However， the density and crystallinity index of the phloem fibers of the Broussonetia kaempferi Siebold were slightly higher than those of the phloem fibers of the Broussonetia papyrifera and Broussonetia kazinoki.

Study on the Preparation of Bamboo (Phyllostachys Pubescens) P-RC APMP and Its Application for Pulp Molding

2026/3/20 12:41:01

In this study， the fast-growing bamboo （Phyllostachys pubescens） was used as raw material to prepare the bamboo （Phyllostachys pubescens） pre-conditioning refiner chemical alkaline peroxide mechanical pulp （P-RC APMP）. The bamboo （Phyllostachys pubescens） P-RC APMP was blended in varying ratios （0~50%） with bamboo/softwood bleached chemical pulp. The pulp molding materials were produced using alkyl ketene dimer （AKD） and polyacrylate as water/oil resistant agent. The pulp properties and effects of the blending ratios of bamboo （Phyllostachys pubescens） P-RC APMP on the physical properties and water/oil resistance of the pulp molding materials were investigated. The results showed that the yield of bamboo （Phyllostachys pubescens） P-RC APMP was 84.25%， and the D65 brightness was achieved 72.1% after three-stage high concentration of bleaching. With the blending ratio of bamboo （Phyllostachys pubescens） P-RC APMP increasing from 0 to 50%， the density， surface smoothness， and tensile strength of pulp molding materials decreased， while air permeability and stiffness increased significantly. Meanwhile， the water resistance was improved with the Cobb60 value decreasing from 20.2 g/m² to 11.5 g/m². When the blending ratio of bamboo （Phyllostachys pubescens） P-RC APMP ranged from 10% to 30%， the oil proof treated pulp molding materials exhibited good oil resistance， with an oil resistance grade of 9~10.

Study on the Preparation and Performance of Aramid Nanofiber Reinforced Aramid Paper-based Insulating Material

2026/3/20 12:41:03

This study mixed para-aramid nanofibers （ANF） with meta-aramid precipitated nanofibers （CXNF） to prepare an aramid nanofiber filler. The aramid nanofiber filler was incorporated into meta-aramid fiber， and combined wet forming processes and hot-pressing technology to produce high-performance aramid composite paper that could be used as an insulating material. The influence of aramid nanofiber filler composition and addition amount on the mechanical and electrical properties of aramid composite paper was investigated， further explored the reinforcement mechanism of aramid nanofibers in aramid composite paper. The results indicated that when the mass ratio of ANF to CXNF in the aramid nanofiber filler was 5∶5 and the filler addition amount was 9%， the prepared aramid composite paper exhibited a breakdown voltage of 785 V with a 16% improvement over meta-aramid paper. The breakdown strength reached 17.41 kV/mm with an 18% increase over meta-aramid paper. Besides， it showed significantly enhanced mechanical properties with tensile strength of 24.1 N/cm， and tearing resistance of 2.56 N， as well as lower dielectric constant and dielectric loss factor， achieving 2.572 F/m and 0.023 34 （1 MHz）， respectively.

Study on the Application of Polyamide Epoxy Chloropropane Resin in Inkjet Paper Coatings

LI Zhiyin,FEI Guiqiang,WANG Yongchao,XIE Pan — 2026/3/20 12:41:03

Using polyamide epoxy chloropropane resin （PAE） as a multifunctional color-fixing agent， this study systematically investigated the action mechanism of PAE on the rheological properties of nano-SiO₂ based coatings， surface properties of coatings and printed image quality of inkjet paper prepared by coating， revealed the structure-property relationship between PAE mass fraction and coating performance. The results indicated that cationic groups in the PAE molecular chain of nano-SiO₂ coating effectively anchored anionic dyes through electrostatic interactions after adding PAE， increasing the color density of prepared inkjet paper printed images by 16% （up to a maximum of 1.289） while significantly enhancing water resistance of coating. At a PAE mass fraction of 10% （relative to the dry mass of SiO₂）， the interlayer adhesion strength of prepared inkjet paper reached 0.344 N/m²， representing a 64.5% increase compared to the uncoated sample.

Study on the Separation Performance of Acid-ketone-water Composite Separation System Towards Aluminum Foil Layer/Polyethylene Plastic Composite Films

ZHANG Sufeng,LEI Dan,SUN Jiexuan,YANG Miaoxui,JING Xiaokai — 2026/3/20 12:41:04

This study accelerated the separation of Aluminum foil layer （AL）/polyethylene plastic （PE） composite films by introducing ketones with mild swelling effects on PE and solubility of low-density adhesive layer PE of AL/PE composite films into traditional acid separators. This approach leveraged the peeling action of organic small-molecule acids on AL to form an organic small-molecule acid-ketone-water composite separation system. This study investigated the separation performance of four acid-ketone-water composite separation systems formed by blending formic acid， acetic acid， acetone， and cyclohexanone for AL/PE composite films. The results indicated that the strongest separation effect of composite separation system towards AL/PE composite film occured at a volume ratio of formic acid∶acetone∶water of 6∶1∶93. Complete separation of AL/PE composite film was achieved in just 17 min， with a total AL/PE loss rate as low as 2.08%. This approach not only significantly enhanced the separation efficiency of paper/AL/PE composite packaging materials， but also effectively reduced organic reagents content of the separation system.

Study on Multiphase Catalytic Ozone Oxidation Combined with Electrocatalytic Oxidation for Pulping and Papermaking Wastewater Treatment

LI Shu,YAN Yongxiang,WANG Yulong,LI Xikang — 2026/3/20 12:41:05

Based on multiphase catalytic ozone oxidation and electrocatalytic oxidation， this study designed an electrolysis deionized water system capable of generating hydroxyl radicals （·OH） and ozone （O₃）， utilizing a composite anode of lanthanum oxide （La₂O₃） from the lanthanide series， and cerium oxide （CeO₂）， paired with a platinum plate cathode. This system was used to treat pulping wastewater of chemical mechanical pulp， white water of whiteboard， white water of unbleached kraft cardboard， and biochemical wastewater （SBR water）. This study also investigated the impact of reusing treated SBR water in papermaking process on prepared paper mechanical properties. The results indicated that at a current of 10 A， the system generated an O₃ flow rate of 4 g/min. When treating the aforementioned pulping and papermaking wastewater， it could significantly reduce chemical oxygen demand （COD_Cr， removal rate of 30.4%~81.6%）， particulate charge demand （PCD， removal rate of 49.5%~72.6%）， and turbidity （removal rate of 81.6%~87.4%） without producing sludge. Upon reuse of treated SBR water in the papermaking process， up to 50% fresh water replacement was achievable， and the prepared paper had excellent properties.

Effects of Neutral Sizing Agent Alkyl Ketene Dimer on Physicochemical Properties of Xuan Paper

2026/3/20 12:41:06

In this study， based on drag-dye sizing process commonly used for traditional handmade paper， and using the neutral sizing agent alkyl ketene dimer （AKD） for single sizing of Xuan paper， the effects of AKD dosage on the physicochemical properties of Xuan paper were investigated. The results showed that the D65 brightness of Xuan paper remained 73%~74% before and after sizing， and color changes fell below the range detectable by the human eye. The AKD sizing reduced the cumulative pore volume and significantly enhanced the hydrophobicity of Xuan paper. In the dry state， the AKD sizing had a limited effect on enhancing the mechanical properties of sized Xuan paper， with tensile index improvements ranging from 1.2% to 7.2% compared to untreated Xuan paper. However， in the wet state， the AKD sizing maintained the wet tensile strength of sized Xuan paper. At different AKD dosages， the alkaline reserve and surface pH of sized Xuan paper consistently remained stable， in the weak alkaline range， demonstrating certain acid resistance and aging resistance capabilities. When the AKD dosage （AKD sizing agent fraction） did not exceed 0.6%， the thermal stability and durability of the sized Xuan paper were positively enhanced.

-->Process and Technology of Pulping and Papermaking

Preparation and Properties of PPTA Chopped Fibers/Copolymerized Modified PPTA Precipitated Fibers Composite Paper

Study on Ozone Bleaching Process of Oxygen Bleached Eucalyptus Soda-AQ Pulp

Treatment of Wastewater and Recycling from Bio-APMP Process of Poplar Heartwood by Biomimetic Degradation Combined with Biological Treatment

Effect of Binder Type on Forming and Physical Properties of Heat-not-burn Reconstituted Tobacco Sheets

Study on the Plant Application of Polysaccharide in the Papermaking Process of Paper-process Reconstituted Tobacco Sheet

Effects of Pre-impregnation Soluble Substrates on the Bleaching Performance of Eucalyptus urophylla×E. grandis Mechanical Pulp

Study on the Treatment of Wastewater from Bio-CMP Process of Poplar Heartwood by Flocculation Combined with Biological Aeration Filter

Main Properties and Quality Control Technologies of Dissolving Pulp for Lyocell Fiber Production

Study on the Cleaning Technology of Silicon Carbide Membrane Purification System for Reconstituted Tobacco Sheet

Research Progress of Effects of Chemical Components of Reconstituted Tobacco Sheet Coatings on Sensory Quality

Study on Improving the Physical Properties of Heat-not-Burn Reconstituted Tobacco Sheet

Investigation into the Energy Consumption-Strength Mechanism of Alkali-Enzyme Synergistic Pretreatment for Optimizing Eucalyptus High-yield Pulp

Study on Simultaneous Removal of Lignin and Silica from Wastewater of Wheat Straw High-yield Pulp and Subsequent Treatment Approach

Statistical Analysis on the Bleachability of Chemi-mechanical Pulp Based on Raw Material Characteristics

Research on Improving the Resistance Properties of Thin Paper with Polyvinyl Alcohol Nanocomposite Coating

Study on Foaming Characteristics of Surfactants and Their Effects on Foam-formed Paper Properties in Plant Fiber Systems

Study on the Influence Mechanism of Starch Enzymatic Hydrolysis Efficiency on the Enhancement Effect of Corrugated Base Paper

Effects of Main Component on the Physical Properties of Reconstituted Tobacco Sheets Prepared by Thick Slurry Process

Factors Affecting the Retention of Calcium Carbonate in Reconstituted Tobacco Sheets

Lightweight Paper Defect Detection Model Based on Re-parameterization and Mutile Query Self Attention

Research Progress on the Influence of Cellulose Coating on the Barrier Properties of Paper-based Food Packaging Materials

Study on the Preparation of Aramid Fiber/Molecular Sieve Paper-based Filtration Material and Its Filtration Properties

Research on Material Analysis of Mica Paper of the Ming Copy of Wen Yuan Ying Hua

Application of α-Amylase or α/β-Compound Amylase Hydrolysed Corn Starch in Surface Sizing of Corrugated Base Paper

Research Progress of Natural Polysaccharides Retention Aids for Reconstituted Tobacco Sheets

Study of AKD Neutral-internal Sizing for the Preparation of High Durability Sized Xuan Paper

Research Progress on the Application of Electrostatic Spinning Encapsulation of Plant Essential Oils in Food Active Packaging

Study on the Antioxidant Activity of Chemi-mechanical Pulp Pre-impregnated Residue and Its Application Prospect in Food Field

Study on Preparation of Anti-adhesion Paraffin/Silica Coating for Paper and Properties of Coated Paper

Study on the Effect of External Fiber Types and Beating Methods on the Properties of Reconstituted Tobacco Sheets

Research on the Impact of Various Aroma Components in Reconstituted Tobacco Sheets on Sensory Quality

Study on Chlorine Dioxide Bleaching Process Based on Chemical Reaction Network Hierarchical Analysis Method

Study on Preparation and Properties of Flexible X-ray Shielding Paper Based on Multi-scale Aramid Network of PMIA/AF/ANF Loaded with CsPbBr3

Study on the In-situ Bacterial Cellulose Synthesis Modification of Sludge Based on Distiller’s Grains Enzymatic Hydrolysate and Its Application as a Paper Filler

Study on the Effects of Bone Glue-Alum Solution Ratios on the Surface Morphology， Physical Structure, and the Expressiveness of Ink Marks of Xuan Paper

Synthesis of Calcium Carboaluminate and Its Mechanism of Silicon Removal from Green Liquor at High Temperature

Research Progress of Transparent Paper-based Materials for Windows

Technological Advances in the Production of Dissolving Pulp from Cotton Linters and Waste Cotton Textiles

Research Progress on the Application of Biological Enzymes in the Optimization of Pulping and Papermaking Process

Establishment and Application of Theoretical Model of In-plane Compressive Plateau Stress in Corrugated-Honeycomb Composite Cardboard

Study on the Morphological and Structure of Three Broussonetia Phloem Fibers

Study on the Preparation of Bamboo (Phyllostachys Pubescens) P-RC APMP and Its Application for Pulp Molding

Study on the Preparation and Performance of Aramid Nanofiber Reinforced Aramid Paper-based Insulating Material

Study on the Application of Polyamide Epoxy Chloropropane Resin in Inkjet Paper Coatings

Study on the Separation Performance of Acid-ketone-water Composite Separation System Towards Aluminum Foil Layer/Polyethylene Plastic Composite Films

Study on Multiphase Catalytic Ozone Oxidation Combined with Electrocatalytic Oxidation for Pulping and Papermaking Wastewater Treatment

Effects of Neutral Sizing Agent Alkyl Ketene Dimer on Physicochemical Properties of Xuan Paper

Study on Preparation and Properties of Flexible X-ray Shielding Paper Based on Multi-scale Aramid Network of PMIA/AF/ANF Loaded with CsPbBr₃