Extrusion & Post
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LDPE Film Shrinkage Rate Fluctuation
Fenómeno del problema
The shrinkage rate of heat shrink film fluctuates between batches, and packaging effect is unstable.
Análisis de la causa
Blow-up and haul-off process fluctuations change the orientation degree; melt index differences between raw material batches also affect shrinkage performance.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solución
①Stabilize the blow-up ratio and draw ratio; ②Control raw material batch consistency; ③Test shrinkage rate and release by batch; ④Fix process parameters.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
The core indicator of shrink film is guaranteed by process stability; batch management is the key to fluctuation control.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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