Extrusion & Post
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PETG extrusion cast film edge thickening
Fenómeno del problema
Bead-like thickening appears at the edges of the cast film, with a large thickness difference from the middle.
Análisis de la causa
After the melt leaves the die, the edge contraction effect (die swell) and surface tension cause thickening, and the cast draw ratio is insufficient.
Solución
Increase the cast draw ratio (air gap adjustment); optimize the die edge compensation design; appropriately lower the melt temperature.
Conclusión clave
PETG cast film edge thickening is a common phenomenon.
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