Air traps are where air is trapped in the cavity to create bubbles in the part during plastic injection molding.
Causes: It is caused by the air being unable to escape from the parting surface, the ram, or the vent when the two melt fronts meet.
Remedies: Structural design: Reduce thickness inconsistency and try to ensure uniform wall thickness
Mold design:
(1) Add a vent at the last filled place
(2) Redesign the gate and runner system
Process:
(1) Reduce the injection speed of the last stage
(2) Increase the mold temperature
