Material Drying
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LDPE Film Hazy Water Marks
Problem Phenomenon
Local hazy water marks on the film surface, with uneven transparency.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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