Processing Machinery
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HDPE thick-wall cooling
Fenómeno del problema
HDPE thick-walled parts have internal shrinkage cavities and long cooling time
Análisis de la causa
The core of the thick wall dissipates heat slowly, insufficient shrinkage compensation forms shrinkage cavities, and the cooling time is forced to be extended; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Holding time and pressure are calculated according to the wall thickness; take the upper limit of mold temperature; strengthen core cooling if necessary; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Thick-walled parts rely on the balance of the holding system and cooling design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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