How 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 spoiled. Is there no other solution for refueling? plastic injection molding, So how is the white border formed?
White edge is a unique injection defect of modified polyethylene and plexiglass, and it mostly appears on the edge of the part close to 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 may return to their natural bending state and cause the white edge to decay.
During the production process, attention should be paid to the close anastomosis of the parting surface of the template, especially the area around the cavity, which must be under true and sufficient clamping force to prevent longitudinal and lateral expansion of the mold.
Decrease injection pressure, time and material volume, and reduce molecular orientation.
Applying oil release agent to the white edge of the mold surface, on the one hand, makes it difficult to transfer heat and maintains a higher high temperature at all times, and on the other hand, it may suppress the white edge to reduce the appearance of the white edge.
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