Processing Machinery
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LDPE Startup Procedure
Problem Phenomenon
Starting up after several days of shutdown, the first batch of film has impurity yellow spots.
Cause Analysis
Residual material from the shutdown oxidizes and mixes into the film at startup; 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
Purge before startup; discharge at low speed until normal; first-piece inspection; 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
When restarting after shutdown, purge residual material first; 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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