Extrusion & Post
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PET Bottle Bottom Material Accumulation (Thick Bottom)
Problem Phenomenon
The material thickness at the center of the bottle bottom is too large, the cost is high and the bottom is whitened.
Cause Analysis
Excessive bottom heating or the stretch rod did not pull the material into place; improper bottom mold temperature.
Solution
①Reduce the bottom lamp zone power; ②optimize the stretch rod stroke and speed; ③check bottom mold cooling; ④adjust pre-blow.
Key Takeaway
Thick bottom = too much heat at the bottom, the rod not in place.
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