Processing Machinery
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PET recycled bottle flake processing
Fenómeno del problema
Recycled bottle flakes extruded into sheet have many bubbles and frequent black specks, and the IV value decreases batch by batch
Análisis de la causa
Residual label glue and contaminants on the bottle flakes generate gas when heated; multiple thermal histories make the IV continuously decrease; bottle flakes are amorphous and must be crystallized before they can be dried without sticking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Strengthen the washing and sorting of bottle flakes; ②crystallize and then dry before processing; ③use high-efficiency melt filtration to intercept impurities and monitor IV; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Recycled bottle flake processing is a complete chain of washing, crystallization, drying, and filtration; failure of any link manifests as defects; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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