紙の伸縮安定性に及ぼす力学的処理条件の影響

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書誌事項

タイトル別名
  • Effect of Mechanical Treatment on Dimensional Stability of Paper
  • カミ ノ シンシュク アンテイセイ ニ オヨボス リキガクテキ ショリ ジョウ
  • 「紙の伸縮安定性に関する研究」第8報

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抄録

It has been well known that dimensional changes of paper are decreased by restraint during drying of the paper. In the case of paper dried under tension, the number of fiber-fiber contact is less than in the case of paper dried without tension. It is considered that stress to the dried sheet has the same effect on the sheet as restraint during drying of wet sheet. In this paper, we discuss the effect of stress to the dried sheet on dimensional stability of paper. The results obtained are summarized below.<BR>1. Stress-strain curves of the papers dried with and without tension were very different, however, stress relaxations of these papers were similar.<BR>2. Moist-expansivity of the papers decreased when they were stressed, because interfiber contacts in the paper were decreased by stress. They were further decreased when the paper was further strained (permanent set).<BR>3. The light scattering coefficient of the paper increased when it was stressed. However, when the stressed paper was conditioned in various humidity cycling, the light scattering coefficient of the paper decreased gradually. It seemed to return to the coefficient before stress.<BR>4. As paper dried under tension, stressed paper gradually shrunk with humidity cycling, and moist-expansivity of this paper increased under these conditions. In other words, the papers in states of restraint have the tendency to become more stable by humidity cycling.<BR>5. Papers were more strained in high humidity than in low humidity, but there was no difference in relationship between light scattering coefficient and moist-expansivity for both papers which strained in high and low humidity.<BR>6. The curling of the papers could be changed by stress. However, this curling was also easily affected by humidity cycling.

収録刊行物

  • 紙パ技協誌

    紙パ技協誌 33 (12), 787-795, 1979

    紙パルプ技術協会

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