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Process for electrostatically assisted curtain coating at high speeds

机译：高速静电辅助幕涂工艺

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摘要

A method for curtain coating various compositions at high speed onto a continuously moving receiving surface comprises a) forming a composite layer of a plurality of coating compositions having density rho of total volumetric flow rate per unit width Q, forming a freely falling curtain from said composite layer, and impinging said freely falling curtain of height h against a continuously moving receiving surface such that the point of impingement has an application angle , b) providing said receiving surface with roughness, Rz(DIN), between about 2 mu m and about 20 mu m, c) providing an electrostatic field at said impingement point whereby high coating speeds can be attained, and d) providing said coating composition forming the layer adjacent to said receiving surface with a viscosity measured at a shear rate of 10,000 s-1 sufficiently high that, when combined with said roughness Rz, said curtain height h, said application angle , said total volumetric flow rate per unit width Q, and said liquid density rho , gives a value of specifying parameter phi E that is greater than 1. IMAGE
机译：一种在连续移动的接收表面上高速幕涂各种组合物的方法，包括：a）形成具有每单位宽度Q的总体积流量密度rho的多种涂料组合物的复合层，由所述复合物形成自由下落的幕布层，将高度为h的自由落下的帘幕撞击在连续移动的接收表面上，以使撞击点具有一个施加角度，b）使所述接收表面的粗糙度Rz（DIN）在大约2μm和大约20之间，c）在所述冲击点提供静电场，从而可以获得高的涂覆速度，d）使形成与所述接收表面相邻的层的所述涂料组合物具有在10,000 s <-1的剪切速率下测得的粘度>足够高，使得当与所述粗糙度Rz，所述帘幕高度h，所述施加角度，所述每单位宽度的总体积流率结合时h Q和所述液体密度rho给出一个指定参数phi E的值，该值大于1。

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