Extrusion & Post
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Haul-off speed mismatch of linear low-density polyethylene extruded products
Fenómeno del problema
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.
Análisis de la causa
(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
Solución
(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
Conclusión clave
Haul-off speed mismatch needs to be solved by precisely adjusting haul-off parameters and ensuring haul-off stability.
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