Injection Molding
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ASA poor venting trapped air
Problem Phenomenon
ASA high-speed filling shows burnt marks and insufficient filling at product end; after reducing speed, surface quality worsens again, falling into a dilemma.
Cause Analysis
ASA recommends high injection speed for the best surface, but when mold venting capacity is insufficient, high-speed filling compresses air with nowhere to escape; burnt and short shot appear simultaneously when venting is poor.
Solution
①Strengthen mold venting according to high-speed process requirements: deepen and densify vent grooves; ②focus venting on end convergence area; ③regularly clean oil contamination in vent grooves; ④vacuum venting to cooperate with high-speed process if necessary.
Key Takeaway
ASA high-speed process and venting capacity are bound conditions; solve venting first, then enjoy the surface and weld line benefits brought by high speed; venting design is checked according to high-speed filling.
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