Extrusion & Post
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PET Bottle Insufficient Vertical Load Capacity
Problem Phenomenon
Finished bottles collapse and deform prematurely in stacking top load tests; when fully loaded stacking, the lower-layer bottles are crushed, causing the whole stack to collapse and the contents to leak.
Cause Analysis
Uneven bottle wall thickness distribution, excessive preform temperature causing insufficient stretch orientation, and unreasonable bottle design are the three main causes; low-temperature high-pressure molding is favorable for orientation strengthening, otherwise the load capacity decreases.
Solution
①Improve bottle wall thickness uniformity; ②adopt low-temperature high-pressure molding to increase orientation degree; ③optimize bottle structure design; ④test bottom stretch ratio and material distribution.
Key Takeaway
Top load strength is jointly determined by wall thickness distribution, orientation degree and bottle type; load problems require reviewing the preform and heating process, and if necessary, structural optimization is used to improve stacking safety.
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