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Research on Preparation of a Heat-sealing Sack Paper
Received:February 18, 2022  
DOI：10.11980/j.issn.0254-508X.2022.09.006
Key Words:sack paper  wet strength  PVA fiber  heat sealing property
Fund Project:科技部重点研发计划（2017YFB307901）。
Author NameAffiliationPostcode
CHENG Jinru Tianjin Key Lab of Pulp and Paper， School of Light Industry Science and Engineering， Tianjin University of Science and Technology， Tianjin， 300457 300457
HU Jianquan Tianjin Key Lab of Pulp and Paper， School of Light Industry Science and Engineering， Tianjin University of Science and Technology， Tianjin， 300457 300457
YANG Qian Tianjin Key Lab of Pulp and Paper， School of Light Industry Science and Engineering， Tianjin University of Science and Technology， Tianjin， 300457 300457
LIU Zhong* Tianjin Key Lab of Pulp and Paper， School of Light Industry Science and Engineering， Tianjin University of Science and Technology， Tianjin， 300457 300457
HUI Lanfeng Tianjin Key Lab of Pulp and Paper， School of Light Industry Science and Engineering， Tianjin University of Science and Technology， Tianjin， 300457 300457
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Abstract:In this study， unbleached softwood pulp and unbleached bamboo pulp were used as raw materials to fabricate sack paper with adding polyamide polyamine epichlorohydrin （PAE） and alkyl ketene dimer （AKD） in the pulp to improve the wet strength and water resistance. After adding polyvinyl alcohol （PVA） fiber to the pulp， the heat-sealing performance of the paper was realized， and the influence of the amount of PVA fiber， the heat-sealing temperature， and the heat-sealing time on the adhesive strength of the sack paper were explored. The results showed that the suitable beating degree of unbleached softwood pulp and unbleached bamboo pulp were 32°SR and 27°SR， respectively， whose optimum mass ratio was 7∶3； the optimum addition amount of PAE and AKD were 1.5% and 0.3%， respectively. When the amount of PVA fiber was 9%， the heat-sealing temperature 110℃， and the heat-sealing time 6 s， the adhesive strength could reach 2.61 kN/m， tear index 14.7 mN·m2/g， dry and wet tensile index 72.9 and 23.4 N·m/g， respectively.
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