Molding Process
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Rough surface of PET foamed sheet
Fenómeno del problema
The surface of PET foamed sheet is uneven, with orange peel texture or bumps.
Análisis de la causa
Foaming gas escapes at the surface, forming pinholes or collapse; die temperature is improper; melt strength is insufficient and bubbles merge and rupture.
Solución
Control die temperature to appropriately cool the surface; increase melt strength (chain extender); control blowing agent dosage and dispersion.
Conclusión clave
PET foamed sheet surface quality needs to be improved from melt strength and process parameters.
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