Material Drying
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ASA Dimensional Deviation
Problem Phenomenon
【Problem Phenomenon】ASA products dimensional deviation, batch-to-batch shrinkage fluctuation
Cause Analysis
Although shrinkage rate 0.4-0.7% is small, mold temperature and holding pressure fluctuation still cause dimensional drift; moisture content change also affects actual shrinkage; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Lock mold temperature, holding pressure and drying parameters; correct mold according to measured shrinkage; key dimensions SPC monitoring; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA low shrinkage is not immune to fluctuation, parameter locking plus SPC; 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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