Processing Machinery
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LDPE Back Pressure Control
Problem Phenomenon
LDPE back pressure too high causes gel spots in the film.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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