Extrusion & Post
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PET edible oil bottle
Problem Phenomenon
After storage, the oil bottle body turns white and turbid, and the loss of transparency affects shelf display
Cause Analysis
Oil bottles have large wall thickness, and uneven cooling during bottle blowing causes local crystallization and whitening; areas with insufficient stretch orientation whiten from stress relaxation during long-term use; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize the bottle blowing cooling and stretch ratio; ②check the preform temperature uniformity; ③adjust the local heating power corresponding to the whitened area; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Oil bottle whitening points to local loss of control of crystallization and orientation; the uniformity of the preform temperature field is the prerequisite for transparency; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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