How do plastic mold manufacturers deal with white edges? Generally, people who do not understand this industry first consider changing materials. Why do you say that, because this is a method that many people who do not understand plastic injection molding processing know, but this method has a flaw, that is, it is wasteful. Is there any other solution for refueling? So how is the white edge formed?
White edge is a special injection defect of modified polyethylene and plexiglass, and it mostly appears on the edge of the part near the parting surface. The white edge is an aggregate composed of many stretched orientation molecules that are straight to the flow direction and the fine intervals between them. There is still a polymer connecting phase in the direction of the white edge, so the white edge is not a crack. Under proper heating, it is possible to restore the stretched orientation molecules to the natural bending state and make the white edge decay.
Solutions for plastic mold manufacturers:
During the production process, pay attention to maintaining 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 longitudinal and lateral mold expansion. the
Reduce injection pressure, time and material volume, and reduce molecular orientation. the
Applying an oil-based release agent to the white edge of the mold surface, on the one hand, makes this position not easy to transfer heat, and keeps the high temperature longer, on the other hand, it may cause the white edge to be suppressed and reduce the appearance of the white edge.