Extrusion & Post
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Haul-off speed mismatch of random copolymer polypropylene pipe special material 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.
The mismatch between the haul-off speed and the extrusion speed leads to product dimensional deviation.
In particular, extra attention is needed on the original basis, 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）On the original basis, extra attention is needed: 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 strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
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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