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| Research on Photoyellowing of Deinked Pulp |
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| DOI：10.11981/j.issn.1000-6842.2018.02.17 |
| Key Words:deinked pulp; photoyellowing; regression analysis; mathematical model |
| Fund Project:华南理工大学制浆造纸工程国家重点实验室项目（201739）；广东省高等学校优秀青年教师培养计划资助项目（YQ2014179）；广东轻工职业技术学院云娜创新创业工作室项目（KYRC2017-0037）。 |
| Author Name | Affiliation | | YUN Na1， * | 1.School of Chemical Technology， Guangdong Industry Polytechnic， Guangzhou， Guangdong Province， 510300 | | HE Bei-hai2 | 2. State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 |
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| Abstract: |
| UV light was used to accelerate the yellowing of the deinked pulps （unbleached pulp， PNaOH bleached pulp， PMg（OH）2 bleached pulp）， and three evaluation indicators of pulp brightness loss， PC number and chromatic aberration were used in combination to evaluate their yellowing behaviour. And a mathematical model describing photoyellowing of deinked pulp was established. The results showed that pulp brightness loss， PC number and chromatic aberration had a linear relationship with b*. With the time of UV irradiation increasing， the pulp brightness loss， PC number and chromatic aberration increased continuously and the yellowing speed declined from fast to slow. The brightness stability of PMg（OH）2 bleached pulp was better than PNaOH bleached pulp. And the established mathematical model was generally applicable． |
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