Extrusion & Post
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Random copolymer polypropylene pipe special material (Nordic standard） extruded products dimensional fluctuation（Variant: Strengthened Measures）
Problem Phenomenon
The outer diameter, wall thickness or width of the extruded product fluctuates periodically or randomly in the longitudinal direction.
Dimensional fluctuation affects product fit accuracy and service performance, common in pipe and profile extrusion.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1）Screw speed unstable, output fluctuates\
（2）Haul-off speed unstable, not matching the extrusion speed\
（3）Barrel temperature fluctuates greatly, melt viscosity changes\
（4）Raw material feeding uneven, discharge fluctuates\
（5）Cooling water temperature or flow fluctuates\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Check the extruder drive system, stabilize the screw speed\
（2）Check the haul-off machine speed control system, ensure stable haul-off speed\
（3）Stabilize the barrel temperature, fluctuation controlled within ±3°C (200-220°C range)\
（4）Check hopper discharge, ensure continuous and uniform feeding\
（5）Stabilize cooling water temperature and flow, add a constant temperature device if necessary\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
Dimensional fluctuation is caused by unstable extrusion or hauling, requiring systematic stabilization of all process parameters.Targeted preventive measures need to be taken in different production scenarios.
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