Processing Machinery
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HDPE startup procedure
Problem Phenomenon
After starting up following a few days of shutdown, the first batch of products has degradation spots
Cause Analysis
The retained material from the shutdown is oxidized and mixed into the products at startup; when troubleshooting on site, 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 data and should be confirmed first during troubleshooting
Solution
Empty the barrel before startup; air-shoot until the extrudate strand is normal; check the first piece; 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
After a shutdown, discharge the residual material first when restarting; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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