Extrusion & Post
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PET cosmetic bottle
Fenómeno del problema
Pearlescent white haze appears on the thick-walled cosmetic bottle body, failing the high-end appearance requirements
Análisis de la causa
When the stretch ratio of a thick-walled bottle is insufficient, the PET is not fully oriented, and stress whitening appears as pearlescence; low preform heating temperature or mismatched stretching speed is the main cause; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Increase the preform heating temperature to the stretching window; ②optimize the matching of stretching speed and blowing pressure; ③increase the heating power for thick-walled areas; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Pearlescent white haze is a sign of insufficient PET orientation; matching adjustment of temperature and stretching is the key process for the appearance of high-end bottles; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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