Injection Molding
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PP Injection Part Gloss Deficiency
Problem Phenomenon
PP parts are overall dull and not bright.
Cause Analysis
Low mold temperature and insufficient holding pressure cause poor surface replication; low mold polish grade; some grades are inherently matte.
Solution
①Raise mold temperature and holding pressure; ②upgrade cavity polishing; ③confirm grade gloss characteristics; ④improve venting.
Key Takeaway
Gloss = replication + mold + grade, three elements.
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