Improving sizing performance of middle layer of liquid packaging board containing high-yield pulp

As the important part of liquid packaging board, the middle layer is generally produced from a mixed pulp furnish by unbleached softwood kraft pulp and high-yield pulp (HYP). However, the addition of HYP would bring unsatisfactory properties (e.g. hydrophilicity) to liquid packaging board. Herein, i...

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Bibliographic Details
Published in:Cellulose (London) 2020-05, Vol.27 (8), p.4707-4719
Main Authors: Zhang, Fangdong, Wang, Lijuan, An, Xingye, Liu, Hongbin, Nie, Shuangxi, Cao, Haibing, Xu, Qingliang, Lu, Bin
Format: Article
Language:English
Subjects:
Additives
Aluminum sulfate
Bioorganic Chemistry
Cations
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Dosage
Flocculation
Glass
Kraft pulp
Natural Materials
Organic Chemistry
Original Research
Packaging
Physical Chemistry
Polyethyleneimine
Polymer Sciences
Pulp & paper mills
Reagents
Rosin
Sizing
Sustainable Development
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Summary:As the important part of liquid packaging board, the middle layer is generally produced from a mixed pulp furnish by unbleached softwood kraft pulp and high-yield pulp (HYP). However, the addition of HYP would bring unsatisfactory properties (e.g. hydrophilicity) to liquid packaging board. Herein, in this study, the sizing performance of middle layer of liquid packaging board was evaluated by varying the kraft pulp to HYP ratios of middle layer, the dosage of sizing agent and cationic additives etc. It showed that the edge penetration value and Cobb value of middle layer illustrated a better liquid repellence with the addition of sizing agent. The improved sizing performance of the middle layer of liquid packaging board can be ascribed to the excellent performance of the added cationic additive (polyethyleneimine (PEI), alums) for trapping anionic trash via neutralization/flocculation effects. In addition, a binary cationic additive system (Al 2 (SO 4 ) 3 -PEI) was proposed to study the improvement on the sizing performance. It was found that a desirable liquid repellence ability can be successfully achieved at a binary additive system containing 1.5% of Al 2 (SO 4 ) 3 and 0.2% of PEI, even when dosage of rosin sizing agent was reduced to 0.5%. The study put forwards a practical approach to improve the sizing performance, especially the liquid repellence ability of liquid packaging board when containing HYP. Graphic abstract
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-020-03081-1