Molds & Tooling
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PET mold surface roughness causing white haze
Problem Phenomenon
The bottle body surface has uneven gloss and local fogging, corresponding to a specific position of the mold; after polishing the mold, the white haze at that position disappears.
Cause Analysis
Scratches, etched pits, or material buildup on the mold cavity surface cause the product surface to replicate microscopic unevenness, which scatters light and forms a foggy surface; the problem is more common with molds of poor polishing quality.
Solution
①Finely polish the cavity surface to a mirror finish; ②regularly clean the mold to remove material buildup; ③repair scratches and etched pits; ④establish mold surface condition inspection.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The mold surface condition is directly replicated onto the bottle surface; optical-grade products require mirror polishing, and regular mold maintenance is the basic work for maintaining high transparency.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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