Material Analysis
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Mechanical properties of general-purpose polyethylene extruded products not up to standard
Problem Phenomenon
The tensile strength, impact strength, or pressure resistance of the product is lower than the standard requirements.
Mechanical properties not up to standard directly affect the use safety of the product, and are especially important in pipes and structural products.
Cause Analysis
（1）The raw material degrades, causing a decrease in molecular weight
（2）The plasticization is uneven, and there are unmelted particles in the melt
（3）The cooling rate is improper, and the crystallinity is inappropriate
（4）The product wall thickness is insufficient or there are bubbles
（5）The regrind ratio is too high
Solution
（1）Control the barrel temperature within the range of 160-260°C to avoid overheating and degradation
（2）Optimize the screw design and speed to ensure sufficient plasticization
（3）Adjust the cooling conditions to ensure appropriate crystallinity
（4）Check the product wall thickness and internal quality to eliminate bubbles
（5）Control the regrind ratio to not exceed 20%
Key Takeaway
Mechanical properties not up to standard are caused by material degradation or poor processing quality, and need to be solved from temperature control and plasticization quality.
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