Material Drying
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TPU Start-Up Procedure
Fenómeno do problema
Starting up after several days of shutdown, the first batch of products has dense bubbles
Análise das causas
The material absorbed moisture during the shutdown and the machine was started directly without re-drying; when troubleshooting on site, verify item by item according to this mechanism to 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
Solução
Re-dry the material for 3 hours before start-up; empty the barrel; 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
Conclusão principal
Re-drying is mandatory when restarting after a shutdown; 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 problems in the future
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