Extrusion & Post
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Random copolymer polypropylene pipe special material (Nordic standard） extruded products haul-off speed mismatch（Variant: Strengthened Measures）
Problem Phenomenon
The extrudate is uneven in thickness; when hauling is too fast the product becomes thinner and narrower, and when hauling is too slow the product becomes thicker and wider.
Mismatch between haul-off speed and extrusion speed causes product dimensional deviation.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1）The haul-off speed setting does not match the extrusion speed\
（2）The haul-off machine slips, the actual haul-off speed is unstable\
（3）The haul-off clamping force is insufficient or too large\
（4）Extrusion speed fluctuations make hauling difficult to synchronize\
（5）The haul-off control system responds slowly\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Adjust the haul-off speed to match the extrusion speed, determine the synchronous speed by the weighing method\
（2）Check the haul-off tracks or rollers, ensure no slipping, replace the clamping pads if necessary\
（3）Adjust the haul-off clamping force, ensure uniform clamping without damaging the product\
（4）Stabilize the extrusion speed, reduce fluctuation\
（5）Upgrade the haul-off control system, improve response speed and accuracy\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
Haul-off speed mismatch needs to be solved by precisely adjusting haul-off parameters and ensuring stable hauling.Targeted preventive measures need to be taken in different production scenarios.
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