건조수축 해석을 통한 종이의 벌크 및 강직성 향상

Improvement of Paper Bulk and Stiffness by Using Drying Shrinkage Analysis

  • 이진호 (한국화학연구원 산업바이오화학연구센터) ;
  • 박종문 (충북대학교 농업생명환경대학 임산공학과)
  • Lee, Jin-Ho (Korea Research Institute of Chemical Technology, Chemical Biotechnology Research Center) ;
  • Park, Jong-Moon (Chungbuk National University, College of Agriculture, Life & Environment Science, Department of Forest Products & Engineering)
  • 투고 : 2011.11.16
  • 심사 : 2011.12.12
  • 발행 : 2011.12.30

초록

The maximum drying shrinkage velocity was proposed to verify bulk and stiffness improvement mechanism during drying according to papermaking parameters. It was based on the wet-web shrinkage behavior without the restraint of wet-web during drying, so intact drying impact could be measured. Bulking agent reduced the drying shrinkage and the maximum drying shrinkage velocity, so paper bulk increased and paper strength decreased. When adding cationic starch to stock with the bulking agent for strengthening, the bulk was increased further with additional decreasing of the drying shrinkage and the maximum drying shrinkage velocity. Paper strength also increased except tensile stiffness index with decreasing the drying shrinkage and the maximum drying shrinkage velocity. When using additional strength additives for strengthening of fiber interfaces extended by bulking agent and cationic starch, amphoteric strength additive increased paper stiffness without loss of paper bulk. It was considered that the added amphoteric strength additives were cross-linked to the stretched cationic starch and this cross-linking increased elasticity of fiber-polymer-fiber interfaces without changing the drying behavior. 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-fiber bonding but it could be improved by strengthening fiber-to-fiber interfaces with polymer complex without loss of bulk.

키워드

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