Extrusion & Post
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PET Bottle Transfer Interval Too Long
Problem Phenomenon
The interval from heating to the blowing station is long for the preform, and pearlescent streaks appear on the bottle body.
Cause Analysis
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.
Solution
①Optimize the robot/turntable cycle to make transfer <2 seconds; ②reduce waiting after the oven; ③check equipment linkage timing.
Key Takeaway
From preform leaving the oven to blowing = a race against 2 seconds.
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