Extrusion & Post
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PET sheet edge cracking
Fenómeno do problema
Edge cracks in the sheet, tearing during winding, and frequent production interruptions
Análise das causas
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
Solução
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
Conclusão principal
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
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