Extrusion & Post
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MP surface dense pitting
Problem Phenomenon
MP product surface has dense 0.1-0.3mm pits, 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 and polish the mold cavity to Ra<0.2μm; 3) filter the raw material 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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