How do mold manufacturers deal with white edges

Update: 02-09-2020

How Pipe Fitting Mould do plastic mold manufacturers deal with white edges? Generally speaking, the first consideration for people who do not understand this profession is to change the material. 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 flaw, that is, it is a waste. Is there no other solution for changing materials? So how is the white border formed?

The white edge is a unique injection defect of modified polyethylene and plexiglass, and it mostly appears on the edge of the part near the parting surface. The white border is a collection of many stretch-oriented molecules that are straight to the direction of the material flow and the fine spaces 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 that the stretch-oriented molecules will return to their natural bending state and the white edge will decline. Plastic mold manufacturer's solution: During the production process, pay attention to the close anastomosis of the parting surface of the template, especially the area around the cavity, and must be under real and sufficient clamping force to prevent vertical and horizontal expansion.


Reduce injection pressure, time and amount of injection, reduce molecular orientation.The oily release agent is applied to the white edge of the mold surface. On the one hand, this position is not easy to transfer heat, and the high temperature is maintained at all times. On the other hand, the white edge may be suppressed to reduce the appearance of the white edge.

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