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首页> 外文期刊>Zeitschrift fur Angewandte Mathematik und Mechanik >On the effect of paper plasticity in calenders
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On the effect of paper plasticity in calenders

机译：关于日历中纸张可塑性的影响

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摘要

The manufacturing process of paper machines consists of several steps to produce high quality papers. This is done by sequentially lined-up machines including the head box, the drying sections, the finishing part and the wrapping systems. In the finishing part, the rollers of the paper calender compress the fibrous material involving viscoelastic and plastic deformations. Modern calenders are composed of several roller pairs, each consisting of a soft and a hard roller. The homogenization of the paper density and the refinement of the paper surface is achieved by the compression in the roller pairs. While very high values for the plastic strain occur in the first roller pair, the plastification decreases for the subsequent pairs. Therefore, the force distribution and the occurring vibrations can deviate significantly between the roller pairs. Two main vibration problems are observed in paper calenders caused by the contact and the orthotropic behavior of the paper: wear-induced corrugation on the surface of the soft rollers and sudden instabilities going along with high vibration amplitudes. In this paper the main focus is placed on a simplified modeling of the paper plastification during the calendering process. The restoring forces are non-smooth due to the plasticity and additional considerations have to be included for the derivation of the stability problem.
机译：造纸机的制造过程包括生产高质量纸的几个步骤。这是通过依次排列的机器完成的，这些机器包括流浆箱，干燥部分，整理部分和包装系统。在精加工部分，压光机的辊压缩纤维材料，包括粘弹性和塑性变形。现代压光机由几对辊组成，每对辊均由软辊和硬辊组成。纸张密度的均匀化和纸张表面的细化是通过辊对中的压缩实现的。当在第一对辊中出现非常高的塑性应变值时，随后的辊对的塑化作用降低。因此，力分布和发生的振动会在辊对之间显着偏离。在压光机中，由纸的接触和正交异性行为引起的两个主要振动问题是：软辊表面的磨损引起的皱纹以及随着高振动幅度而突然出现的不稳定性。在本文中，主要重点放在压延过程中纸塑化的简化模型上。由于可塑性，恢复力是不平滑的，因此必须考虑其他因素来解决稳定性问题。

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