Molds & Tooling
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PET Preform Surface Scratches
Problem Phenomenon
Irregular scratches or regularly recurring scratches appear on the preform surface, affecting appearance and possibly becoming stress concentration sources.
Cause Analysis
The preform contacts objects such as guide rails after demolding, producing random scratches; mold surface damage or material accumulation produces repeated scratches; deformation and insufficient precision of the demolding guide rail are the main causes of mechanical scratches.
Solution
①Overhaul the mold cavity surface and remove accumulated material; ②correct the demolding guide rail and restore fit precision; ③optimize preform conveying to avoid hard contact; ④promptly polish and repair scratched molds.
Key Takeaway
Scratches are divided into random and repeated types, and repeated scratches must point to mold or guide rail problems; the responsible part can be quickly located according to the scratch distribution pattern, and timely repair avoids batch defects.
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