Molds & Tooling
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PC Product Abnormal Dimensional Shrinkage After Demolding
Fenómeno do problema
PC parts' shrinkage after demolding deviates greatly from expectations, and dimensions are unstable.
Análise das causas
Excessive or insufficient holding pressure changes the frozen density; mold temperature deviating from the setting affects shrinkage; non-unified measurement temperature also causes misjudgment; although PC has low shrinkage, it is still sensitive to the process.
Solução
①Unify measurement temperature and aging; ②Check the actual mold temperature; ③Optimize the holding pressure curve, taking both feeding and internal stress into account; ④Correct the process according to the measured shrinkage; ⑤Stabilize the environment.
Conclusão principal
For PC dimensional deviation, 'first unify the measurement benchmark': non-unified measurement conditions are the illusion of many 'drifts'; PC's low shrinkage does not mean you can do whatever you want, the benchmark must come first.
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