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Monday, October 26, 2015

Ways to Increase Bulk and Stiffness of Paper

At the 2012 International Paper Physics Conference in Stockholm, June 10-14, 2012, Jin-Ho Lee and Jong-Moon Park produced a study titled, "Evaluation of drying shrinkage velocity of paper to analyze bulk and stiffness changes of paper."
SUMMARY:
HSAThe 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 be improved by strengthening fiber-to-fiber interfaces with polymer complex without loss of bulk.
This type of analysis can be performed by using the Emtec HSA - Heat Shrinkage Analyzer . It is a measuring instrument for the investigation of the dimension stability of paper/board/OPP foils under thermal load up to 230°C.
  • Main applications:
    • Runnability at professional laser printing machines and copy machines
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      • four color laser printing
      • offset printing
      • rotogravure printing, decor printing