Extrusion & Post
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PET Bottle Unreasonable Heating Temperature Gradient
Problem Phenomenon
The whole batch of bottles shows whitening or insufficient stretching at fixed positions, and changing preforms does not solve it.
Cause Analysis
Unreasonable infrared lamp power distribution, uneven heating distance, too fast temperature rise, and insufficient ventilation and heat dissipation make the preform surface zone temperature difference exceed 15℃ (beyond process tolerance).
Solution
①Calibrate the lamp zone power gradient according to the bottle type (low at the neck, high at the body, moderate at the bottom); ②calibrate the heating distance; ③check the ventilation fan; ④use temperature measurement means to verify the preform surface temperature field.
Key Takeaway
The lamp zone gradient is the core parameter of the blow '2079851475616104453.
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