Study on the Equivalent Pressure Coefficient of the Viscosity Model Shaped by Ultra-thin Injection Molding

In ultra-thin injection molding, with the increase of pressure, the nonlinear relationship between pressure and viscosity becomes more and more obvious. The pressure dependence of Cross-WLF viscosity model can no longer reflect the actual production. So,this paper based on the free volume theory, expounds how the pressure affects the melt viscosity in the Cross-WLF viscosity model, and based on the variations of the specific volume in the PVT melt curve, demonstrates that the pressure dependence of melt viscosity is significantly nonlinear in the ultra-thin high-pressure injection molding, which is inconsistent with the traditional linearity. In order to reflect the actual production better, this paper defines the equivalent pressure coefficient of the viscosity model and justifies it in the production of the ultra-thin light guide plate. (paper)