Extrusion & Post
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Dense PVA surface pockmarks
Problem Phenomenon
PVA product surface has dense 0.1-0.3mm pockmarks affecting appearance and coating adhesion
Cause Analysis
Raw material contains impurity particles >0.05%; mold cavity surface damaged or corroded pits
Solution
1) Replace with pure raw material, impurities <0.01%; 2) Repair mold cavity and polish to Ra<0.2μm; 3) Filter raw material to remove particles
Key Takeaway
Pockmarks are caused by raw material impurities and mold damage; pure raw material and mold maintenance are the key
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