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首页> 外文期刊>Paperi ja Puu >Laboratory scale measurement procedure for the runnability of a wet web on a paper machine, Part 2
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Laboratory scale measurement procedure for the runnability of a wet web on a paper machine, Part 2

机译：用于造纸机上湿纸幅运行的实验室规模测量程序，第2部分

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In the second part of the series we further link wet paper results of fast tensile test rig IMPACT with paper machine runnability. This paper presents the effects of filler and Kraft content, refining level, jet/wire ratio, and strain rate on the tensile and relaxation properties of a wet web. Since relaxation occurs in all papers subjected to a constant strain increase, the key item is the tension holding capacity of paper. It depends naturally on draw levels, but also greatly on properties of furnish, including its numerous modification possibilities at different raw material handling and stock preparation stages. The effect of the filler content on hand-sheets in-plane tensile and relaxation properties were shown to be strongly dependent on dry solids content. Filler content level was shown to affect more wet web tensile than relaxation properties. The relationship between density and tensile strength of dry paper was shown to be linear. Wet paper tensile strength and residual tension were not developed linearly by increasing density. In order to evaluate wet web runnability, both residual tension and dry solids content of paper should be observed. The effect of the jet/wire ratio was similar on both wet and dry MD/CD tensile strength ratios, whereas at constant jet/wire ratio the MD/CD ratio of residual tension was significantly higher. This was mainly due to low elasticity of wet web in CD. Strain rate were shown to have significant effect on stress relaxation percentage as well as the maximum tension of wet paper.
机译：在该系列的第二部分中，我们进一步将快速拉伸试验机IMPACT的湿纸结果与造纸机的可运行性联系起来。本文介绍了填料和牛皮纸含量，精制水平，射流/丝比和应变率对湿纸幅拉伸和松弛性能的影响。由于在承受恒定应变增加的所有纸张中都会出现松弛，因此关键的是纸张的张力保持能力。它自然取决于拉伸水平，而且极大地取决于配料的性能，包括其在不同的原料处理和原料制备阶段的众多修改可能性。填料含量对手抄纸的面内拉伸和松弛性能的影响显示出强烈依赖于干固体含量。已显示填料含量水平比松弛性能对湿纸幅拉伸的影响更大。干纸的密度和抗张强度之间的关系显示为线性。湿纸的抗张强度和残余张力不会随着密度的增加而线性增长。为了评估湿纸幅的可运行性，应同时观察纸的残余张力和干固体含量。射流/丝比率对湿和干MD / CD拉伸强度比的影响相似，而在恒定的射流/丝比率下，残余张力的MD / CD比率明显更高。这主要是由于CD中湿纸幅的弹性较低。应变率显示出对应力松弛百分比以及湿纸的最大张力具有显着影响。

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