Processing Machinery
1 views
LLDPE first-piece verification
Problem Phenomenon
After material and die changes, bubble instability and thickness fluctuation occur in batches, with first piece checked only for appearance
Cause Analysis
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
Solution
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
Key Takeaway
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
Was this helpful?
0 people found this helpful
Thank you for your feedback!