Die drool, die swell, lump, surface quality

Die drool, die swell, lump, surface quality   The plastic materials are Non-Newtonian material and they are defined Pseudo-Newtonian materials. They are considered Viscoelastic materials. This can be explained by Kelvin and Maxwell model so by system of springs and viscous dumpers. The viscoelasticity of the polymers plays a fundamental role in the extrusion operation […]

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