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| Simulation Experiment of Pressing—the Research on the Dewatering Mechanism of Felt-sheet System for Extended Nip Press |
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| DOI：10.11981/j.issn.1000-6842.2016.04.30 |
| Key Words:press felt-sheet system； model experiment of pressing； dewatering mechanism of press section； average pressure of press felt； press felt surface structure |
| Fund Project:2014年南京林业大学江苏省制浆造纸科学与技术重点实验室开放基金资助项目（201409）；江苏高校优势学科建设工程资助项目(PAPD) |
| Author Name | Affiliation | | 朱 文1,3 | 1.南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037；3.南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京,210037 | | 叶 平2 | 2.江苏金呢工程织物股份有限公司,江苏海门,226100 | | 沙九龙1 | 1.南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 张 辉1,3,* | 1.南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037；3.南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京,210037 |
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| Abstract: |
| Based on the microstructure characteristic analysis of the felt in extended nip press(ENP), two sets of simulation experimental devices were designed and used for pressing simulation study. The research focused on characterizing the micro-scale stress(MSS) variation of press felt and the influences of press felt structure and sheet grammage on dewatering process during pressing; furthermore, the dewatering mechanism of felt-sheet system(FSS) for ENP was discussed. The results suggested that MSS on the contact area (or compound layer) of press felt and wet web was non-uniform which reduced the dewatering efficiency; the nonuniform stress transfer by the felt surface batt fibers made the contact area dividing into compression and non-compression zones, and the non-compression zone had high water permeability and became the main channels for water flow; when dewatering through the unimpeded nework, the dewatering condition was called “pressing-controlled dominant dewatering”, and on the contrary, when the network was impeded, the dewatering condition was called “flowing-controlled dominant dewatering”; concerning dewatering efficiency, the most important considering factor of the felt structure was the diameter of the batt fiber, the second was the base weave design of the felt, and at last was the number of batt layers. For low grammage paper, the fine press felt was more advantageous to dewatering in pressing process which had the fine batt fibers, multiple layers of base weave and more batt layers; while for high grammage paper (especially the paper with coarse pulp fibers) which together with felt created the contact zone with high proportional non-compression zones. The press felt with coarser batt fibers, double or single layers of base weave and less batt layers was advantageous to the dewatering process. It was also suggested that the average pressure of the press felt surface could be used as one of the indicators for measuring its comprehensive performance of press felt. |
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