Material Drying
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ASA Bubbles and Air Pockets
Problem Phenomenon
【Problem Phenomenon】Bubbles inside ASA products, holes visible on sectioning, strength affected
Cause Analysis
Moisture vaporization, degradation gas generation and thick-wall shrinkage cavities are the three types of bubbles: moisture type distributed overall, degradation type accompanied by discoloration, shrinkage cavity type concentrated in thick-wall core; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Locate the cause according to bubble distribution; moisture type strengthens drying, degradation type lowers temperature and shortens residence, shrinkage cavity type strengthens holding pressure; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA bubbles are classified by distribution, symptomatic treatment is effective; 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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