Extrusion & Post
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HDPE pipe inner wall chatter rings
Problembeschreibung
Periodic annular ripples appear on the inner wall of the pipe, with intervals related to the haul-off rhythm, and the inner wall feels uneven.
Ursachenanalyse
Uneven water outlet of the sizing sleeve makes cooling inconsistent; mismatch of the vacuum degree between the second vacuum chamber and the front chamber, overly tight vacuum seal, or haul-off jitter all cause the pipe blank to fluctuate periodically during sizing to form chatter rings.
Lösung
①Adjust the sizing sleeve water outlet to be uniform; ②adjust the rear chamber vacuum degree slightly higher than the front chamber; ③check whether the vacuum seal is too tight; ④check haul-off jitter and main machine discharge uniformity.
Wichtigste Erkenntnis
Inner wall chatter rings are a typical manifestation of coordination problems between vacuum sizing and haul-off; checking item by item in the order of water outlet, vacuum, seal, and haul-off usually locates and eliminates it quickly.
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