Material Analysis
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Random copolymer polypropylene extruded products mechanical properties substandard
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.
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
Solution
（1）Control the barrel temperature within the 190-260°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%
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.
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