紙管の湿度依存性が巻取りロール内部応力へ与える影響の実験的評価

抄録

A web is a general term for thin and flexible continuous media, and there is a roll-to-roll production method that can consistently perform from unwinding to winding as a web production method. In this production method, the core is wound in a roll shape, and from the viewpoint of cost reduction, it is often wrapped around a paper core. However, winding defects occur during winding, and in order to prevent winding defects, it is necessary to accurately predict changes in the internal state of the winding roll and wind under appropriate winding conditions. Therefore, Hashimoto performed a theoretical calculation of the internal stress state of the roll, and confirmed a difference between the theoretical value and the measured value in the radial stress near the core. This is because the anisotropy of the core in Young's modulus and humidity expansion is not considered.Therefore, in this study, we measured the Young's modulus of the paper tube in dry and wet conditions for the purpose of evaluating the effect of the anisotropy of the Young's modulus on the humidity dependence of the paper tube on the radial stress near the core. After that, we calculated the theoretical value of the radial stress and compared it with the measured value. The measurement confirmed that the anisotropy in the Young's modulus of the paper tube and the humidity dependence of the paper tube affected the Young's modulus. Furthermore, it was confirmed that the Young's modulus of the paper tube affects the radial stress.