Processing Machinery
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HDPE startup procedure
Fenómeno del problema
After starting up following a few days of shutdown, the first batch of products has degradation spots
Análisis de la causa
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
Solución
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
Conclusión clave
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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