Extrusion & Post
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PET wide-mouth bottle preform
Problem Phenomenon
The mouth of the wide-mouth bottle preform crystallizes and turns white, the cap screwing seal is poor, and the contents leak
Cause Analysis
The unstretched area of the bottle finish crystallizes and turns white in the hot environment of bottle blowing, and the hardness change affects the dimensions of the thread sealing surface; excessively high crystallinity of the bottle finish also embrittles it and causes chipping; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Cooling protection of the bottle finish to prevent overheating crystallization; ②control the preform mouth temperature; ③sample-inspect the sealing surface dimensions after bottle blowing; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The bottle finish is the functional vital point of a wide-mouth bottle; dual control of crystallinity and dimensions holds the bottom line of sealing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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