Processing Machinery
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LDPE Back Pressure Control
Fenómeno do problema
LDPE back pressure too high causes gel spots in the film.
Análise das causas
High back pressure shear heat causes local overheating to form gels; 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.
Solução
Control back pressure at the low limit; measure actual melt temperature; when gels appear, check back pressure; 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.
Conclusão principal
LDPE back pressure should be low to prevent gels; 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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