Injection Molding
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PA6 '2079851475616104452 uneven shrinkage
Fenómeno del problema
Large shrinkage differences in different directions of the same part, unstable dimensions.
Análisis de la causa
Crystallization orientation anisotropy + wall thickness differences; shrinkage differs between flow/transverse directions; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as uneven shrinkage and orientation to avoid misjudgment.
Solución
①Optimize wall thickness uniformity to reduce differential shrinkage; ②balance holding pressure and time, taking into account both feeding and stress; ③optimize gate position and size; ④ensure uniform mold temperature; ⑤use CAE analysis to assist decision-making when necessary.
Conclusión clave
PA6 uneven shrinkage='orientation and wall thickness': the anisotropy of crystalline materials is the root cause; uniform wall thickness and gate optimization are the main line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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