Extrusion & Post
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PBAT broken holes and pinholes
Fenómeno do problema
Pinholes and broken holes appear in PBAT film, occurring intermittently during blown film, and missed inspection leads to customer complaints.
Análise das causas
Impurities or gel particles in the raw material; damaged screen allows impurities to pass; poor plasticization produces unmelted particles; blown film temperature too low and plasticization insufficient; local over-thinning of the film bubble causes rupture.
Solução
①Strengthen raw material filtration and screening; ②regularly replace the screen; ③increase plasticization temperature to ensure full melting; ④check film bubble uniformity; ⑤configure an online pinhole detector.
Conclusão principal
Screen and plasticization are the main causes of PBAT pinhole defects; online detection is an interception means; raw material cleanliness management cannot be ignored.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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