Extrusion & Post
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Haul-off speed mismatch of heat-resistant polyethylene extruded products (Variant: strengthened measures)
Problem Phenomenon
The extrudate is uneven in thickness; when the haul-off is too fast the product becomes thinner and narrower, and when the haul-off is too slow the product becomes thicker and wider.
Mismatch between haul-off speed and extrusion speed causes product dimensional deviation.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Haul-off speed setting does not match extrusion speed
(2) Haul-off machine slips, actual haul-off speed unstable
(3) Haul-off clamping force insufficient or excessive
(4) Extrusion speed fluctuation makes haul-off difficult to synchronize
(5) Haul-off control system responds slowly
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Adjust haul-off speed to match extrusion speed, determine synchronous speed by weighing method
(2) Check haul-off tracks or rollers to ensure no slipping, replace clamping pads if necessary
(3) Adjust haul-off clamping force to ensure uniform clamping without damaging the product
(4) Stabilize extrusion speed, reduce fluctuation
(5) Upgrade the haul-off control system to improve response speed and accuracy
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Haul-off speed mismatch needs to be solved by precisely adjusting haul-off parameters and ensuring haul-off stability.
Targeted preventive measures need to be taken in different production scenarios.
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