Extrusion & Post
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PET bottles too soft with insufficient strength
Problem Phenomenon
The finished bottles feel soft to the touch, deform easily when pressed, have low top-load values, bulge and deform after filling, and pose a high stacking risk.
Cause Analysis
The main causes are unreasonable bottle design and excessively high processing temperature resulting in insufficient stretch orientation; when the orientation degree is low, the PET molecular chains are not fully strengthened, and the rigidity of the bottle body naturally decreases.
Solution
①Improve the bottle shape and wall thickness design; ②perform preform injection and bottle '2079851475616104457 at as low a temperature as possible; ③optimize the stretch ratio to increase the orientation degree; ④measure the wall thickness of each part of the bottle body.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
A bottle being too soft requires distinguishing a design problem from a process problem; low-temperature molding to increase orientation is an effective means of improving rigidity, but the whitening risk must be taken into account for comprehensive balance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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