Injection Molding
5 görüntüleme
ABS burnt (trapped air burn marks)
Sorun Belirtisi
Black/brown burn marks appear at the end of the cavity, rib ends, or weld lines, possibly accompanied by odor.
Neden Analizi
During filling, the air in the cavity is compressed and cannot be discharged, producing the diesel effect that burns the plastic at high temperature; blocked vent grooves or too fast injection speed are the main causes.
Çözüm
①Open/deepen vent grooves at the burnt position (ABS vent depth about 0.02~0.04mm); ②clean the vents blocked by oil; ③reduce the end injection speed; ④reduce the amount of mold release agent.
Temel Çıkarım
Repeated burning at a fixed position=venting problem; clean the vent grooves first.
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