Extrusion & Post
1 views
PET sheet edge cracking
Problem Phenomenon
Edge cracks in the sheet, tearing during winding, and frequent production interruptions
Cause Analysis
Improper cooling creates excessive internal stress in the sheet; degraded material has insufficient toughness; excessive winding tension strains the edges; uneven thickness makes edges locally too thin; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Optimize cooling conditions to reduce internal stress; ② improve raw material quality; ③ adjust winding tension and keep thickness consistent; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PET sheet edges are weak zones of stress and thickness; a three-pronged approach of cooling, tension, and thickness prevents edge cracking and web breaks; 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!