Extrusion & Post
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POE surface dense pitting
Problem Phenomenon
POE product surface 0.1-0.3mm dense pitting, affecting appearance and coating adhesion
Cause Analysis
Raw material contains impurity particles >0.05%; mold cavity surface damage or corrosion pits
Solution
1) Replace with pure raw material, impurities <0.01%; 2) Mold cavity repair and polish to Ra<0.2μm; 3) Raw material filtration to remove particles
Key Takeaway
Pitting is caused by raw material impurities and mold damage; pure raw material and mold maintenance are key
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