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causes and solutions for gas marks (burning)

When molten plastic is injected into a mold cavity, the air that is in that cavity needs a place to escape. If the hot compressed air cannot escape, it may leave burn mark on the part. The best way to avoid gas marks is to strategically locate air vents of the proper depth within the mold. Adjustments to process parameters such as injection speed and screw speed can be altered to reduce or eliminate burning. When there are bubbles on the products,  we should relocate the gate or modify the flow path. And it is better to add a pin in the area to eliminate the gas trap.
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