How do plastic mould manufacturers handle white edges? […]
How do plastic mould manufacturers handle white edges? Generally, people who don't know this profession think about material exchange first. Why do you say that? Because this is a method known to many people who don't know plastic injection processing, but this method has a defect, that is, waste, then there is no other solution except material exchange? So what is the white edge made of?
White edge is a special injection defect of modified polyethylene and plexiglass, which mostly appears on the edge of parts near the parting surface. White edges are aggregates of many stretch-oriented molecules that are straight in the direction of material flow and fine intervals between them. There are macromolecule linking phases in the white direction, so the white edge is not a crack. Under proper heating, it may make the tensile oriented molecules return to the natural bending state and make the white edge decay.
Solutions for plastic mould manufacturers:
During the production process, attention should be paid to the close coincidence of the parting surface of the formwork, especially in the area around the cavity, which must be under the real and sufficient clamping force to prevent the longitudinal and transverse die expansion.
Reduce injection pressure, time and material quantity, and reduce molecular orientation.
On the one hand, it is not easy to heat transfer in this direction by applying oil release agent on the white side of the die, which maintains more at high temperature, on the other hand, it may cause the white edge to be suppressed and the white edge to be reduced.