Extrusion & Post
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Haul-off speed mismatch of random copolymer polypropylene pipe special material extruded products (Variant: mass production scenario)
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.
The mismatch between the haul-off speed and the extrusion speed leads to product dimensional deviation.
In particular, in continuous mass production, this problem is more prominent and needs key attention.
Cause Analysis
（1）The haul-off speed setting does not match the extrusion speed
（2）The haul-off machine slips, and the actual haul-off speed is unstable
（3）The haul-off clamping force is insufficient or too large
（4）The extrusion speed fluctuates, making the haul-off difficult to synchronize
（5）The haul-off control system responds slowly
（6）In continuous mass production, process parameter fluctuations or equipment status changes have aggravated this problem
Solution
（1）Adjust the haul-off speed to match the extrusion speed, and determine the synchronization speed by the weighing method
（2）Check the haul-off track or roller to ensure no slipping, and replace the clamping pad if necessary
（3）Adjust the haul-off clamping force to ensure uniform clamping without damaging the product
（4）Stabilize the extrusion speed and reduce fluctuations
（5）Upgrade the haul-off control system to improve response speed and accuracy
（6）And establish standardized work instructions, with special attention to parameter stability in continuous mass production
Key Takeaway
Haul-off speed mismatch needs to be solved by accurately adjusting the haul-off parameters and ensuring stable haul-off.
In different production scenarios, targeted preventive measures need to be taken.
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