Molds & Tooling
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ASA Burnt Air Trap
Problem Phenomenon
【Problem Phenomenon】Brown and black burnt marks at end rib positions of ASA products, accompanied by odor
Cause Analysis
Air trapped in the cavity is compressed at high speed and adiabatically heated, burning the melt; deep-cavity rib positions with poor venting are high-incidence areas; more likely to occur when melt temperature is high; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Strengthen venting at end and rib positions; reduce final-stage injection speed; appropriately call back when melt temperature is near upper limit; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA burnt first open venting then reduce final-stage speed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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