Material Drying
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HDPE drying judgment
Fenómeno do problema
HDPE is nominally non-water-absorbing, but bubbles still appear in products in the rainy season
Análise das causas
HDPE has an extremely low water absorption rate, but surface-attached water and moisture brought in by recycled material still exceed the standard in the rainy season; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
New material stored sealed can be exempted from drying; rainy season and recycled material are dried at 80-90℃ for 1-2 hours; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
HDPE drying is performed as needed, and rainy season and recycled material must be dried; 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 similar future problems
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