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26 November 2012

Evaluation of drying shrinkage velocity of paper to analyze bulk and stiffness changes of paper

The emtec HSA - Heat Shrinkage Analyzer at

2012 International Paper Physics Conference in Stockholm, June 10-14, 2012 - Conference Proceedings

Study from Jin-Ho Lee and Jong-Moon Park


The aim of this study is to find out appropriate ways to increase bulk and stiffness of paper. Maximum drying shrinkage velocity is newly developed to verify bulk and stiffness improvement mechanism by evaluating drying behavior and drying impact of wet-web according to varying papermaking parameters. Physical properties of paper including bulk and strength were highly correlated with the maximum drying shrinkage velocity because fibers and their interfaces are shrunk during drying despite of fibers bonding interfering conditions by fillers and polymers. Paper bulk could be increased with decreasing the maximum drying shrinkage velocity. The drying shrinkage of paper also could be controlled by fiber-to-fiber bonding interfaces by the bulking agent. In this case, paper strength including stiffness was decreased by reducing fiber-to-fibers bonding but it could be improved by strengthening fiber-to-fiber interfaces with polymer complex without loss of bulk.