Material Drying
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PCABS Dimensional Deviation
Problem Phenomenon
[Problem Phenomenon] PC/ABS product dimensions drift, and batches are unstable
Cause Analysis
Mold temperature and holding pressure fluctuations, moisture content changes, and regrind ratio fluctuations all affect shrinkage; although 0.5-0.7% shrinkage is small, the process still needs to be locked; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Lock mold temperature, holding pressure, and drying parameters; SPC monitoring of key dimensions; fix the regrind ratio; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PC/ABS dimensions rely on parameter locking and SPC monitoring; 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 similar problems in the future
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