主题：再生纤维性能影响度基于灰关联法分析再生纤维性能对纸张机械性能的影响度

Analysis of the Influence Degree of Recycled Fiber Performance on Paper Mechanical Properties Based on Grey Relational Analysis

关键词:  再生纤维  纤维性能  纸张  机械强度  灰关联分析

Key Words:recycled fibers  fiber performance  mechanical strength  grey relational analysis

摘要:本研究对美废12#^和13#^进行三次循环回用,探究再生纤维性能和纸张机械强度的变化及二者间的关联度。结果表明相比于美废12#^,13#^{的物理尺寸更大},细小纤维含量更高,损伤更深；三次回用使12#^和13#^的纤维长度加权长下降了10.8%和15.7%,分丝帚化长度比增加了11.2%和2.3%,纤维扭结和弯曲减少,折断增加,13#^的细小纤维含量减少,12#^先增后减；三次回用后12#^抄造的再生纸张抗张指数和耐破指数相较第一次分别下降21.4%和10.2%,13#^下降10.7%和2.6%,两种纸张的耐折度分别增强了25.6%和3.2%,撕裂指数12#^上升而13#^下降,12#^的再生纸张机械强度普遍优于13#^；采用灰色关联分析法揭示得到再生纤维的短纤维占比、细小纤维含量和扭结纤维占比是影响再生纸张机械强度的主要因素,三者主要影响纤维间的结合。

Abstract:This research carried out three recycling processes for US old corrugated container (OCC) 12# ^{and US OCC 13#}, investigating the variations in the properties of regenerated fibers and the mechanical strength of paper as well as the correlation between them. The results show that 13^# has larger physical dimensions, a higher content of fine fibers, and more severe damage compared to 12^#. After three recycling cycles, the fiber length-weighted average decreased by 10.8% and 15.7%, while the splitting length increased by 11.2% and 2.3% for 12# ^{and 13#}, respectively. Twisted and bent fibers decreased, while broken fibers increased. The fine fiber content decreased in 13^# and initially increased then decreased in 12#^. During the third cycle, the tensile and burst indices of paper made from 12^# dropped by 21.4% and 10.2%, respectively, while 13# ^{decreased by 10.7% and 2.6%.} However, the folding endurance of both materials improved by 25.6% and 3.2%, respectively. The tear index of 12# ^{increased, while 13}# ^{decreased. Generally, 12#} exhibited superior mechanical strength. Grey relational analysis showed that the proportions of short fibers, fine fibers, and twisted fibers are the key factors affecting paper strength, mainly acting on fiber bonding.