Material Analysis
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PBAT gel particles and fish eyes
Problem Phenomenon
Gel particles and fish-eye defects appear on the surface of PBAT film, optical and barrier properties decrease, and the appearance is poor.
Cause Analysis
Crosslinked gel or impurities in the raw material; poor compatibility between PBAT and filler causing agglomeration; insufficient screen precision; uneven plasticization temperature with local overheating degradation; recycled material mixed with degraded particles.
Solution
①Incoming inspection and screening of raw materials; ②increase screen precision and replace regularly; ③uniform control of plasticization temperature; ④separate management of recycled material; ⑤gel particle detection and rejection.
Key Takeaway
Raw material quality and compatibility are the key to PBAT gel particles; screen management is a low-cost defense line; the use of recycled material must be carefully evaluated.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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