Extrusion & Post
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PETG extrusion cast film edge thickening
Problem Phenomenon
Bead-like thickening appears at the edges of the cast film, with a large thickness difference from the middle.
Cause Analysis
After the melt leaves the die, the edge contraction effect (die swell) and surface tension cause thickening, and the cast draw ratio is insufficient.
Solution
Increase the cast draw ratio (air gap adjustment); optimize the die edge compensation design; appropriately lower the melt temperature.
Key Takeaway
PETG cast film edge thickening is a common phenomenon.
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