Material Drying
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LDPE Film Hazy Water Marks
Problembeschreibung
Local hazy water marks on the film surface, with uneven transparency.
Ursachenanalyse
Too low extrusion temperature gives poor plasticizing, and unmelted particles scatter light; moisture-affected resin with excessive water content also forms water marks.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Lösung
①Appropriately raise extrusion temperature to improve plasticizing; ②Dry the raw material to within 0.3% moisture content; ③Check screw plasticizing; ④Store sealed.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Wichtigste Erkenntnis
Hazy water marks are the apparent signal of plasticizing and moisture problems; these two checks can quickly locate the cause.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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