Extrusion & Post
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Random copolymer polypropylene pipe special material (Nordic standard） extrusion process unstable output/surging
Problem Phenomenon
The extruder output is sometimes more and sometimes less, the extrudate is uneven in thickness, and periodic surging occurs.
Unstable output directly affects product dimensional accuracy and quality consistency.
Cause Analysis
（1）The screw feed section conveys unstably, the solid bed breaks\
（2）The hopper discharges poorly, the raw material bridges\
（3）Barrel temperature set improperly, feed section temperature too high or too low\
（4）Screw speed fluctuates\
（5）Raw material particle size uneven or contains too much powder
Solution
（1）Optimize the barrel temperature distribution, appropriately lower the feed section temperature to prevent premature melting\
（2）Install a vibrator on the hopper to prevent bridging and ensure continuous discharge\
（3）Reasonably set the temperature of each barrel section, ensure it is within the 200-220°C range\
（4）Check the extruder drive system, stabilize the screw speed\
（5）Control raw material particle uniformity, powder proportion not exceeding 5%
Key Takeaway
Unstable output is caused by unstable solids conveying, requiring optimization of barrel temperature and the feeding system.
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