Material Analysis
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Pockmarks/pinholes on product surface
Problem Phenomenon
A large number of tiny holes or pits appear on the surface, with rough hand feel, seriously affecting appearance
Cause Analysis
Dispersed phase particles are too large, forming defects on the product surface; gas entrained during melt filling is not compacted; additive decomposition
Solution
Improve the dispersion shear effect of the screw mixing section; reduce injection speed to reduce gas entrainment; increase holding pressure and extend holding time by 50%
Key Takeaway
Surface pinhole defects originate from insufficient dispersion and gas entrainment
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