Extrusion & Post
2 Aufrufe
HDPE film gel particles and fisheyes
Problembeschreibung
Transparent small particles and fisheye-shaped defects appear on the surface of the blown film, affecting appearance and heat-sealing quality.
Ursachenanalyse
Unplasticized particles, degraded gel or impurities in the raw material enter the film with the melt; insufficient screw mixing and broken screen allow gel particles to pass through.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
①Improve screen precision and replace regularly; ②optimize the screw mixing section; ③strengthen raw material management to prevent impurities; ④clean the accumulated material in the dead corners of the die head.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Gel particles are the most common appearance defect of film; the three lines of defense of filtration, mixing and cleanliness are all indispensable.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!