Material Drying
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LDPE Regrind Drying
Fenómeno del problema
LDPE film blended with regrind shows bubbles.
Análisis de la causa
Regrind (especially edge trim) is exposed and absorbs moisture, and is fluffy and traps air; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; This mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting.
Solución
Dry regrind at 80℃; regrind pelletizing for densification; blending ratio control; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes to facilitate locating effective measures.
Conclusión clave
LDPE regrind is used with drying plus densification; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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