Extrusion & Post
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LDPE Film Wrinkles
Fenómeno do problema
Longitudinal and transverse wrinkles appear on the wound film surface, and some wrinkles cannot be smoothed out.
Análise das causas
Uneven die head installation, off-center collapsing frame and haul-off rolls, and non-level nip rolls are mechanical causes; film bubble deformation, improper cooling and inconstant tension are process causes.
Solução
①Correct die head levelness and alignment of all parts; ②adjust the collapsing frame opening angle to match the bubble tube diameter; ③stabilize the film bubble and cooling; ④adjust winding tension to be constant.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Wrinkle troubleshooting goes mechanical first and process second; alignment correction can solve most stubborn wrinkles.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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