五辊无溶剂涂布涂层厚度数学模型与影响因子分析

目的研究如何实现高效的无溶剂涂布,获得稳定的预定厚度涂层。方法在建立两辊间隙间涂布液流动数学模型的基础上,从涂布液辊间间隙分流分配关系和总结构内涂布液流量平衡两方面,分析无溶剂五辊顺转涂布系统涂布厚度的影响因素。结果转移钢辊和涂布钢辊的速比,计量辊和转移钢辊之间的间隙以及橡胶转移辊的压力等是对涂层厚度有直接影响的因子,毛细准数是涂层竖条道缺陷的主要影响因子,而涂布液的非牛顿特性会加重竖条道缺陷。结论设计无溶剂五辊顺转涂布系统时,需要综合考虑辊的直径、施加给橡胶辊载荷大小的范围、橡胶辊的硬度、适用涂布液的粘度范围和速度极限等因素。

Mathematical Model and Its Impact Factors of Coating Membrane Thickness from Five Rollers Solvent-free Coating System

The work aims to study how to realize the high efficient solvent-less coating and obtain stable coating with predetermined thickness. By building a mathematical model of the coating flow in the roller gap, the impact factors of coating membrane thickness from five rollers solvent-free coating system coating film thickness were analyzed from the aspects of flux and splitting of the coating flow in the roller gap and the flow balance in the overall structure. The main influence factors of coating thickness included the speed rate between the transfer steel roller and the coating steel roller, the gap between the metering roller and the transfer steel roller and the pressure of the rubber transfer roller. In conclusion, the diameter of the roller, the range of load imposed on the rubber roller, the hardness of rubber roller hardness, the suitable viscosity range and the speed limit must be taken into account during the design of the five rollers solvent-free coating system.