Material Drying
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PET bottle high haze exceeding standard
Problem Phenomenon
For products with high transparency requirements, the haze test exceeds 3%, customer inspection fails, and the problem is concentrated in specific production periods.
Cause Analysis
Preform crystallization, poor surface replication, or hydrolysis micropores all push up haze; periods of mold temperature fluctuation and drying abnormality often correspond to batches with excessive haze.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Test by batch with a haze meter; ②trace back the drying and temperature control records of the periods exceeding the standard; ③eliminate crystallization and condensation factors; ④re-test to confirm after the process stabilizes.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Haze is the quantitative indicator for transparent PET products; establishing linkage between per-batch haze testing and process records can quickly locate the root cause of exceeding the standard.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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