Extrusion & Post
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LDPE Thermocouple Calibration
Problem Phenomenon
Two blown film lines with the same parameters produce different film thicknesses.
Cause Analysis
Temperature control deviation makes actual melt temperatures different, with different viscosity and output; 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
Regularly calibrate thermocouples; replace when deviation exceeds ±3℃; 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
Multi-line consistency relies on unified temperature control metrology; 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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