What Are The Basic Factors That Affect The Shrinkage Of Plastics? 2

As a supplier of Packing Plastic Core Tube, we continue to introduce the basic factors that affect the shrinkage of plastics.

3) In the form of gates, the gate type directly affects the flow process during filling, and thus also affects the shrinkage rate, the most important of which is the gate section size. Large cross-section gates help increase cavity pressure and extend gate closure time, allowing more melt to enter the cavity, resulting in higher density and reduced shrinkage.

4) The mold temperature lowers the mold temperature so that the melt cooling and solidification speed of the mold cavity wall portion becomes faster, and the solidified layer of the wall portion is rapidly thickened so that the plastic part is rapidly solidified and the shrinkage rate of the plastic part is lowered.

5) Plastic parts wall thickness crystal plastic. The shrinkage rate increases with the increase of the wall thickness of the plastic part. In the amorphous plastic, the change of shrinkage is different. The shrinkage rate of plastics such as ABS and PC is not affected by the wall thickness; plastics such as PE and SAN The shrinkage rate increases with the increase of wall thickness; the shrinkage rate of HPVC decreases with the increase of wall thickness.

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