Processing Machinery
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HDPE film insufficient screw mixing
Fenómeno del problema
The film has many gel particles and poor dispersion, which improved after switching to a barrier screw with a mixing section.
Análisis de la causa
Ordinary screws are inadequate for the melt uniformity requirements of film-grade; unmelted and semi-melted particles directly enter the film and form gel particles.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Select a screw with a barrier section and mixing head; ②ensure a sufficient length-to-diameter ratio; ③optimize the temperature to promote plasticization; ④regularly check the screw condition.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Film has the highest requirements for melt uniformity; screw design is the equipment foundation of gel particle control.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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