Extrusion & Post
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PET Bottle Transfer Interval Too Long
Fenómeno del problema
The interval from heating to the blowing station is long for the preform, and pearlescent streaks appear on the bottle body.
Análisis de la causa
The preform cools naturally after leaving the oven, the surface undergoes secondary crystallization and the internal-external temperature difference increases, forming pearlescence during stretching; the standard requires the transfer interval to be controlled within 2 seconds.
Solución
①Optimize the robot/turntable cycle to make transfer <2 seconds; ②reduce waiting after the oven; ③check equipment linkage timing.
Conclusión clave
From preform leaving the oven to blowing = a race against 2 seconds.
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