Processing Machinery
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PA66 sink mark treatment
Fenómeno del problema
Sink marks are obvious on the back of rib positions of PA66 products, appearance complaints
Análisis de la causa
The thermal mass at rib positions shrinks and pulls the surface, and sink marks solidify when holding pressure feeding is insufficient; excessive rib thickness ratio is the design root cause; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solución
Control rib thickness at 50-60% of the main wall; raise holding pressure and holding time; structurally optimize and thin the areas with high appearance requirements; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Conclusión clave
For sink marks, check the rib thickness ratio first, then compensate with holding pressure; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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