Molds & Tooling
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Scratches on PET preforms during conveying
Problem Phenomenon
PET preforms collide and rub against each other on the conveyor belt, producing scratches and whitening on the surface.
Cause Analysis
Preform demolding temperature is on the high side and surface hardness is insufficient; conveyor belt speed is too fast, causing collisions; buffer design is improper.
Solution
Reduce demolding temperature and extend cooling time; reduce conveyor belt speed and add spacing devices; use soft material contact surfaces.
Key Takeaway
PET preform scratching is a common problem in the post-processing stage.
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