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In the injection moulding process, the mould cavity is filled by pressure-driven flow, in fact the material is injected very fast into a mould through small gates. The melt is at high temperature in the filling phase and some viscous heating also occurs due to friction. This increases the melt temperature even more and thus change (lowers) the viscosity. The gate dimension so effect a lot the material behavior.

As viscosity is a function of pressure, the pressure dependence of viscosity may become important in this kind of process. In addition to shear also extensional deformation has a significant effect, due to viscoelasticity.
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