Blow Molding
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Uneven core rod temperature in PET bottle injection-stretch-'2079851475616104457
Fenómeno del problema
When the PET preform is heated and stretched on the core rod, the core rod temperature distribution is uneven, causing local overheating or overcooling of the preform.
Análisis de la causa
Some core rod heating elements fail or power distribution is uneven; the temperature control system responds with lag; scale on the core rod surface affects heat transfer.
Solución
Check and replace heating elements; optimize temperature control parameters; regularly clean the core rod surface; use infrared thermometry to verify temperature distribution.
Conclusión clave
PET core rod temperature uniformity is critical to preform stretching consistency.
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