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Blotching in roll coating

机译：辊涂中的斑点

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摘要

After thermoforming, plastic parts are stacked for shipping, and these parts tend to stick together. Called nesting, sheet stock is often first coated with a silicone compound before thermoforming to prevent this. The coating usually consists of a small amount of lubricant dispersed in a majority of carrier fluid, and this fluid must then dry before reaching the sheet winder or else the coating blotches. This coupling of coating and drying to determine when to expect blotching is examined. Roll coating involves a dimensionless group called the elasticity number that governs the thickness of the coating to be dried. The drying section involves the evaporation of the coating carrier fluid, and then diffusion into the dry surrounding atmosphere. When analyzing the drying, a new dimensionless group that governs blotching is discovered, called blotchability. The result of this analysis allows practitioners to determine which operating conditions cause blotching, and how to eliminate it. Roll coating uses a deflecting rubber roll to apply vanishingly thin coatings ( ≤ 1 μm), an interesting elastohydrodynamic problem.
机译：热成型后，将塑料零件堆叠起来运输，这些零件往往会粘在一起。所谓的套料，通常是在热成型之前先用有机硅化合物涂覆板材，以防止这种情况。涂层通常由少量分散在大多数载液中的润滑剂组成，然后必须先干燥这种流体，然后才能到达复卷机或涂层出现斑点。检查涂层和干燥的这种耦合，以确定何时预期出现斑点。辊涂涉及一个称为弹性数的无量纲基团，它决定着待干燥涂层的厚度。干燥段涉及涂层载体流体的蒸发，然后扩散到干燥的周围大气中。在分析干燥时，发现了一个新的无因次基团，它控制着斑点，称为斑点。该分析的结果使从业人员可以确定哪些操作条件导致斑点，以及如何消除斑点。辊涂使用偏斜的橡胶辊来施加逐渐消失的薄涂层（≤1μm），这是一个有趣的弹性流体力学问题。

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  • 来源
    《JCT》 |2011年第1期|p.67-74|共8页
  • 作者

    A. W. Mix; Z. B. Chen; L. M. Johnson; A. J. Giacomin;

  • 作者单位

    Mechanical Engineering Department, Rheology Research Center, University of Wisconsin-Madison, 1513 University Avenue, Madison, WI 53706-1572, USA;

    Mechanical Engineering Department, Rheology Research Center, University of Wisconsin-Madison, 1513 University Avenue, Madison, WI 53706-1572, USA;

    Material Science Program, Rheology Research Center,University of Wisconsin-Madison, 1513 University Avenue,Madison, WI 53706-1572, USA;

    Mechanical Engineering Department, Rheology Research Center, University of Wisconsin-Madison, 1513 University Avenue, Madison, WI 53706-1572, USA,Material Science Program, Rheology Research Center,University of Wisconsin-Madison, 1513 University Avenue,Madison, WI 53706-1572, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    roll coating; thermoforming; elastohydrodynamic; nesting; blotching;

    机译：辊涂;热成型;弹性流体动力嵌套斑点;

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