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首页> 外文会议>Technical Association of the Pulp and Paper Industry Paper Conference and Trade Show >Combined Modeling And Experimental Studies To Optimize The Balance Between Fold Crack Resistance And Stiffness For Multilayered Paper Coatings - Part 2:Pilot Coater Experimental Studies
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Combined Modeling And Experimental Studies To Optimize The Balance Between Fold Crack Resistance And Stiffness For Multilayered Paper Coatings - Part 2:Pilot Coater Experimental Studies

机译：组合建模与实验研究，优化多层纸涂层折叠裂纹抗性与刚度的平衡。第2部分：试验涂布机实验研究

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Fold-crack resistance is a key coated paper quality that influences the functionality and appearance of the final product. Cracking at the fold may lead to strength reduction and the appearance of a visible crack at the folded surface. It is well known that bending stiffness and fold cracking are closely related, with a higher stiffness leading to higher risk of fold cracking. The aim of this study was to optimize the balance of stiffness and fold cracking for multilayered paper coatings. This paper is Part 2 of a combined modeling and experimental study to assess the relationship between fold-crack resistance and bending stiffness in coated papers. The objective of the work was to suggest ways to optimize coated paper to maximize fold-crack resistance as well as bending stiffness.In this experimental part of the study we have worked with double and triple coated paper on the pilot coater scale and studied the influence of the following parameters: the binder stiffness (including the distribution of stiffness between different layers), the thickness of coating layer (including the distribution of thickness) and the coating strength (including distribution of strength between layers).For double coated paper, it was seen that having a strong outer layer is positive. An outer coating layer with an increased amount of a medium stiff binder clearly improved fold crack resistance at similar stiffness. It was also seen that the layer thickness in general has a strong influence, with the thicker layer dominating the results. Therefore, there was no positive effect of making the outer coating stronger if the bottom coating is very thick.A positive effect was seen from making the bottom coating thicker in double coating, and this might be explained by the possible buffering effect on the outer layer as seen in the computer simulations. Further, for double coated paper it was seen that it was positive for the fold crack/stiffness balance to use a relatively soft binder in the outer coating, provided that the strength was high enough.In this study, the best possibilities to optimize the balance between fold cracking and bending stiffness were seen for triple coated paper. As shown in the computer simulations and confirmed by experiments the use of a thin, very stiff bottom layer, combined with a thick medium stiff middle layer and a thin medium stiff outer layer gave the best balance between stiffness and fold-cracking resistance.
机译：折叠裂纹电阻是影响最终产品的功能和外观的关键涂层纸质质量。在折叠处开裂可能导致强度减小和折叠表面上可见裂缝的外观。众所周知，弯曲刚度和折叠裂缝密切相关，具有更高的刚度，导致折叠破裂的风险较高。本研究的目的是优化多层纸涂层的刚度和折叠开裂的平衡。本文是综合建模和实验研究的第2部分，以评估涂布纸折叠裂纹抗性和弯曲刚度之间的关系。该工作的目的是建议优化涂布纸以最大化折叠裂纹抗性以及弯曲僵硬。在该研究的实验部分，我们已经在试验涂布法规模上使用了双和三涂层纸，并研究了影响以下参数：粘合剂刚度（包括不同层之间的刚度分布），涂层厚度（包括厚度分布）和涂层强度（包括层之间的强度分布）。对于双涂层纸，它被认为具有强外层是阳性的。外涂层具有较高的介质刚性粘合剂的耐粘合剂的耐刚度明显提高了折叠抗裂性。还可以看出，层厚度一般具有很大的影响，具有较厚的层占据了结果。因此，如果底部涂层非常厚，则没有积极的效果使外涂层更强。从双涂层中较厚的底层涂层看到阳性效果，可以通过对外层的可能的缓冲效果来解释如在计算机模拟中所见。此外，对于双涂布纸，看来折叠裂缝/刚度平衡在外涂层中使用相对柔软的粘合剂是阳性的，条件是强度足够高。在本研究中，优化平衡的最佳可能性对于三重涂布纸，观察到折叠开裂和弯曲刚度之间。如计算机模拟和通过实验证实的使用薄，非常僵硬的底层，与厚介质硬度层和薄介质刚性外层相结合，使得刚度和折叠裂化抗裂性之间的最佳平衡。

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