Molds & Tooling
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Overall lack of gloss on PP products
Problem Phenomenon
The surface of PP products is overall dull and not bright, failing to achieve the expected mirror or high-gloss effect.
Cause Analysis
Low mold temperature and insufficient holding pressure make the melt replicate the cavity surface insufficiently; the mold polishing grade is inadequate; some grades are inherently matte or semi-matte and it is difficult to make them high gloss.
Solution
①Appropriately increase the mold temperature and holding pressure to improve surface replication; ②raise the cavity polishing grade; ③confirm whether the gloss characteristics of the grade used match the high-gloss requirement; ④improve venting to avoid surface gas marks affecting gloss; ⑤switch to a high-gloss grade when necessary.
Key Takeaway
PP gloss = the three elements of 'replication + mold + grade': mold temperature and holding pressure determine replication, polishing determines the upper limit, and the grade determines the ceiling; before making high gloss, first confirm whether the grade can be glossy, then talk about the process.
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