Operational limits of blade coating associated with high aspect ratio pigments: Part I—bench top blade coater

Lisa Weeks, P. Gane, Tony Lyons, D. Bousfield
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Abstract

Operational issues, such as stalagmite formations, scratches, or spits, develop during blade coating of high solids coatings at high web speeds. Coatings that contain high aspect ratio pigments exhibit these difficulties at lower solids concentrations and slower machine speeds than coatings comprised of more spherical shaped pigments. There are a number of potential reasons behind this phenomenon, but a clear mechanism is not well established. Using a bench top blade coater without a base sheet, the goal of this study is to understand the operational limits that occur due to the coating suspension interacting with the blade. Pigment suspensions are applied in excess in front of the blade. A camera mounted near the blade exit is used to detect defects and buildup on the backside of the blade. The machine speed at which deposits on the blade first appear was determined for three pigments having different shape factors and at varying weight fractions. A Newtonian fluid was also used in the coating device. A runnability window based on shape factor and solids content was developed. Small changes in the solids concentration displayed changes in the speed at which blade deposits begin to appear. No operational issues could be produced using the Newtonian fluid. Presence of the particles at solids concentration nearing their immobilization solids mustbe contributing to the development of runnability issues.
与高纵横比颜料有关的叶片涂层的操作限制。第i部分:台式顶部叶片涂层机
操作问题,如石笋的形成,划痕,或吐痰,发展在叶片涂层高固体涂层在高卷筒速度。含有高纵横比颜料的涂料在较低的固体浓度和较慢的机器速度下比含有更多球形颜料的涂料表现出这些困难。这一现象背后有许多潜在的原因,但没有一个明确的机制。使用没有基片的台式刀片涂布机,本研究的目标是了解由于涂层悬浮液与刀片相互作用而发生的操作限制。颜料悬浮液在叶片前面过量使用。安装在叶片出口附近的摄像机用于检测叶片背面的缺陷和堆积。对于具有不同形状因素和不同重量分数的三种颜料,确定了在叶片上首次出现沉积物的机器速度。在涂层装置中也使用了牛顿流体。建立了基于形状因子和固体含量的可运行性窗口。固体浓度的微小变化表明叶片沉积开始出现的速度发生了变化。使用牛顿流体不会产生任何操作问题。颗粒在固体浓度接近其固定固体的存在,必须有助于发展的可操作性问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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