Extrusion & Post
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HDPE film thick ears
Problem Phenomenon
The thickness of both edges of the film is significantly greater than the middle, and the ears bulge after winding.
Cause Analysis
Rapid heat dissipation at both ends of the die lip causes differences in edge melt viscosity; uneven stress distribution at the edges during the blowing process also causes the thickness deviation.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Independent temperature control compensation for the edge area of the die head; ②optimize the die lip arc design; ③adjust the air output at the edge of the air ring; ④wind after trimming.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thick ears are a manifestation of the edge effect; edge temperature control and structural compensation can effectively flatten the thickness difference.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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