Extrusion & Post
4 조회수
PET edible oil bottle
문제 현상
After storage, the oil bottle body turns white and turbid, and the loss of transparency affects shelf display
원인 분석
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
해결 방법
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
핵심 요약
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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