Extrusion & Post
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PET crystallinity control
Problem Phenomenon
PET preforms develop crystallized white spots after storage and are difficult to blow
Cause Analysis
Local crystallinity increase in the preform body produces white spots, and crystallized preforms rupture from stress concentration during bottle blowing stretching; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Control the melt temperature and cooling rate to prevent preform body crystallization; avoid high temperatures during storage; downgrade crystallized preforms for use; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Preform body crystallization is the great enemy of bottle blowing, and both temperature control and storage must guard against it; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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