Extrusion & Post
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Haul-off speed mismatch of linear low-density polyethylene extruded products (variant: strengthened measures)
Problem Phenomenon
The extrudate is uneven in thickness; when haul-off is too fast the product becomes thinner and narrower, and when haul-off is too slow the product becomes thicker and wider.
Mismatch between haul-off speed and extrusion speed causes product dimensional deviation.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
(1) Haul-off speed setting does not match extrusion speed
(2) The haul-off machine slips, and the actual haul-off speed is unstable
(3) Haul-off clamping force is insufficient or excessive
(4) Extrusion speed fluctuations make haul-off difficult to synchronize
(5) The haul-off control system responds slowly
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solution
(1) Adjust the haul-off speed to match the extrusion speed, and determine the synchronized speed by the weighing method
(2) Check haul-off belts or rollers to ensure no slipping, and replace clamping pads if necessary
(3) Adjust the haul-off clamping force to ensure uniform clamping without damaging the product
(4) Stabilize extrusion speed and reduce fluctuations
(5) Upgrade the haul-off control system to improve response speed and precision
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay 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.
In different production scenarios, targeted preventive measures need to be taken.
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