基于POLY FLOW的聚氯乙烯复合人造革涂布刮刀受力研究

目前对涂布过程中流体的研究多为牛顿流体，而实际流体为非牛顿流体，针对研究结果与实际偏差较大，难以用 于指导实际生产的缺点，提出了一种应用POLYFLOW软件对非牛顿流体涂布过程进行仿真的方法。建立了涂布刀二维 仿真模型，包括涂布刀二维几何模型、网格模型、涂布刀物理模型参数设置、非牛顿流体模型参数设置几个方面。仿真结 果得到了不同影响因素下非牛顿流体的静压力图及速度图。研究表明：涂布刀所受压力与离型速度成正相关关系，与温 度、涂布刀与辊轮的间隙和涂布刀安装角度成负相关关系。进而为实际生产提出了建议：安装涂布刀时，安装角度尽可 能大；涂层较薄时，可增加约束或自动调节机构减少涂布刀的受力变形；适当控制离型纸速度；适当增加涂料的温度。该 方法比较真实地模拟了非牛顿流体在涂布过程中的流动，为涂布行业提高产品质量提供理论依据。

Pressure Study of Coating Blade of Polyvinyl Chloride Composite Leather Based on POLYFLOW

The research on coating process fluid is more about Newtonian fluid, but the actual fluid is non-Newtonian fluid. So the research result deviation is large, and it is difficult to guide the actual product. A method that simulated the non-Newtonian fluid coating process was proposed based on POLYFLOW software. The dimensional coating blade simulation model was established, which included coating blade dimensional geometric model, mesh model, physical model parameters and non-Newtonian fluid model parameter set. The non-Newtonian fluid static pressure and speed diagram were obtained. The coating blade''s pressure was as follows, the pressure had positive correlation with release paper speed, and it had negative correlation with temperature, the gap of coating blade and roller and mounting angle of coating blade. So put forward some suggestions for actual production: when installing coating blade,the mounting angle should be larger. The coating is thin, and the constraint or automatic adjustment mechanism is increased to reduce the stress and deformation of coating blade. The temperature of coating is controlled, and the paper speed is released. The method simulates the non-Newtonian fluid flow in the coating process actually. It provides a theoretical basis to improve product quality of the coating industry.