Molding Process
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Rough surface of PET foamed sheet
Problem Phenomenon
The surface of PET foamed sheet is uneven, with orange peel texture or bumps.
Cause Analysis
Foaming gas escapes at the surface, forming pinholes or collapse; die temperature is improper; melt strength is insufficient and bubbles merge and rupture.
Solution
Control die temperature to appropriately cool the surface; increase melt strength (chain extender); control blowing agent dosage and dispersion.
Key Takeaway
PET foamed sheet surface quality needs to be improved from melt strength and process parameters.
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