Processing Machinery
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LLDPE first-piece verification
Fenómeno del problema
After material and die changes, bubble instability and thickness fluctuation occur in batches, with first piece checked only for appearance
Análisis de la causa
LLDPE is sensitive to air ring and temperature, bubble stability changes after grade change; if the first piece is not verified for thickness distribution and bubble stability, batch risk is out of control; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①Perform three first-piece verifications: appearance, thickness distribution and bubble stability; ②re-confirm process parameters after grade change; ③mass produce after parameter locking; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
LLDPE first-piece verification must include bubble stability; thickness distribution plus bubble observation, dual indicators prevent batch accidents; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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