Extrusion & Post
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HDPE Processing Aid PPA
Problembeschreibung
To eliminate sharkskin, extrusion speed is reduced, causing serious capacity loss, a dilemma between the two
Ursachenanalyse
Fluoroelastomer PPA migrates to the die wall to form a lubricating layer, promoting wall slip and eliminating sharkskin without reducing speed; dosage is 200-2000ppm, taking effect in 15-60 minutes
Lösung
①Add PPA masterbatch at 200-2000ppm; ②switch to maintenance dosage after initial shock dosage; ③note that anti-blocking agents consume the PPA coating; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
PPA is the key additive for HDPE to achieve both high speed and high quality; dosage strategy and onset time management are application essentials; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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