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Process limits in two-layer reverse roll transfer

机译：两层反向辊转移的过程限制

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摘要

Reverse roll coating in which a thin single layer of liquid is applied onto a substrate has been used in industry for decades and has been extensively analyzed in the literature. Modern coatings, however, are often composed of more than one layer to improve the product performance and to reduce the manufacturing cost. Premetered methods such as slot, slide, and curtain coatings are typically used to produce such multilayer coatings. If the caliper of the substrate to be coated is not constant, then the coating gap and consequently the final film thickness deposited on the web will also be nonuniform. In this study, we focused on the use of reverse roll technique with slot die liquid delivery system to produce a uniform thin two-layer coating. The use of this coating technique to produce such a coating has not been previously explored. The liquid film surface as it is transferred from a rigid steel roll to a deformable urethane-covered roll was visualized to find out how the uniformity of the two-layer coating is affected by the speed ratio between two rolls, layers' wet thicknesses, and liquid viscosities. The effect of these parameters on the ribbing frequency and amplitude was also investigated. The results show that in the two-layer coating, as in the single layer reverse transfer, there is a critical web speed above which ribbing occurs. The critical speed is determined by the bottom layer viscosity.
机译：在工业上已经使用了将薄薄的单层液体涂覆到基底上的反向辊涂，并且在文献中已经进行了广泛的分析。但是，现代涂料通常由不止一层组成，以提高产品性能并降低制造成本。诸如狭缝，滑动和幕涂的预定方法通常用于生产这种多层涂层。如果要涂覆的基底的厚度不恒定，则涂覆间隙以及因此沉积在幅材上的最终膜厚度也将是不均匀的。在这项研究中，我们专注于使用反向辊技术和缝模液体输送系统来生产均匀的薄两层涂层。以前没有研究过使用这种涂层技术生产这种涂层。将液膜表面从刚性钢辊转移到覆盖有可变形聚氨酯的辊上进行可视化处理，以发现两层涂层的均匀性如何受到两个辊之间的速比，各层的湿厚度和液体粘度。还研究了这些参数对肋骨频率和振幅的影响。结果表明，在两层涂层中，如同在单层反向转印中一样，存在临界的幅材速度，在该速度以上会发生罗纹。临界速度由底层粘度决定。

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  • 来源
    《Journal of coatings technology and research》 |2013年第4期|485-492|共8页
  • 作者

    M. Sasaki; W. J. Suszynski; M. S. Carvalho; L. F. Francis;

  • 作者单位

    JFE Steel Corporation, 1 Kokancho, Fukuyama,Hiroshima 721-8510, Japan;

    Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave, SE,Minneapolis, MN 55455, USA;

    Department of Mechanical Engineering,Pontificia Universidade Catolica do Rio de Janeiro,Rua Marques de Sao Vicente 225, Gavea, Rio de Janeiro,RJ 22453-900, Brazil;

    Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave, SE,Minneapolis, MN 55455, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Multilayered coating; Reverse roll; Ribbing; Visualization;

    机译：多层涂层;反转辊;罗纹;可视化;

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