Extrusion & Post
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Haul-off speed mismatch of low density polyethylene extruded products
Problem Phenomenon
Extrudate thickness is uneven; when haul-off is too fast the product becomes thinner and narrower, when haul-off is too slow the product becomes thicker and wider.
Mismatch between haul-off speed and extrusion speed causes product dimensional deviation.
Cause Analysis
(1) Haul-off speed setting mismatched with extrusion speed
(2) Haul-off slipping, actual haul-off speed unstable
(3) Haul-off clamping force insufficient or excessive
(4) Extrusion speed fluctuation makes haul-off synchronization difficult
(5) Slow response of haul-off control system
Solution
(1) Adjust haul-off speed to match extrusion speed, determine synchronous speed by weighing method
(2) Check haul-off tracks or rollers, ensure no slipping, replace clamping pads when necessary
(3) Adjust haul-off clamping force, ensure uniform clamping without damaging the product
(4) Stabilize extrusion speed, reduce fluctuation
(5) Upgrade the haul-off control system, improve response speed and accuracy
Key Takeaway
Haul-off speed mismatch needs to be solved by precisely adjusting haul-off parameters and ensuring haul-off stability.
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