Processing Machinery
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Random copolymer polypropylene pipe special material (Nordic standard） extruded products mechanical properties substandard（Variant: Strengthened Measures）
Problem Phenomenon
The product tensile strength, impact strength or pressure resistance is lower than standard requirements.
Substandard mechanical properties directly affect product use safety, especially important in pipes and structural products.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1）Raw material degradation causes molecular weight decrease\
（2）Uneven plasticization, unmelted particles in the melt\
（3）Improper cooling rate, unsuitable crystallinity\
（4）Product wall thickness insufficient or has bubbles\
（5）Regrind ratio too high\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Control the barrel temperature within the 200-220°C range to avoid overheating degradation\
（2）Optimize screw design and speed, ensure full plasticization\
（3）Adjust cooling conditions, ensure suitable crystallinity\
（4）Check product wall thickness and internal quality, eliminate bubbles\
（5）Control the regrind ratio not exceeding 20%\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
Substandard mechanical properties are caused by material degradation or poor processing quality, and need to be solved from temperature control and plasticization quality.Targeted preventive measures need to be taken in different production scenarios.
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