Thermoforming
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Linear gel particles and delamination on PET sheet surface
Problem Phenomenon
Gel particles on the PET extruded sheet surface align in lines along the extrusion direction, and linear holes appear during '2079851475616104458.
Cause Analysis
There is material hang-up or damage at a certain point of the die lip; material residence time at that point differs, causing local degradation and forming a linear defect.
Solution
Clean and polish the die lip and check for scratches; adjust the die lip temperature at that point; use a melt pump to stabilize pressure.
Key Takeaway
PET linear gel particles point to a problem at a specific die lip position.
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