How do plastic mold manufacturers deal with white edges? Generally, people who do not understand this profession first consider changing materials. Why do you say that? Because this is a method that many people who do not understand plastic injection processing know, but this method has a drawback, which is waste. Is there no other solution other than changing the material? So how is the white border formed?
White edge is a unique injection defect of modified polyethylene and plexiglass, mainly on the edge of the part near the parting surface. The white edge is an aggregate composed of many tiny spaces between directly stretched oriented molecules and the flow direction. There is still a polymer link phase in the direction of the white edge, so the white edge is not a crack. Under proper heating, the stretched-direction molecules may return to their natural bending state, causing the white edge to drop.
Solutions for plastic mold manufacturers:
In the production process, it is necessary to pay attention to the close matching of the parting surface of the template, especially the area around the cavity, which must be under a truly sufficient clamping force to prevent vertical and horizontal expansion. Reduce injection pressure, time and material volume, reduce molecular orientation. Apply oil release agent in the direction of the white edge of the die surface. On the one hand, this direction is not easy to transfer heat, and the high temperature can be maintained for more time. On the other hand, it may suppress and reduce the white edge.
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