Why plastic parts have deformation when processing

The basic reason for surface sag: from the perspective of plastics, when the plastic cools and shrink, insufficient filling will lead to product surface sag or internal cavity. The causes and solutions of defects are different depending on the location of sag. The typical thick wall and the surface sag or hole far from the sprue are usually due to the increase of effective viscosity and pressure loss, resulting in insufficient pressure in the mold cavity, resulting in insufficient pressure for filling.

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