Processing Machinery
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Mechanical properties of polyolefin plastomer extruded products not up to standard (Variant: Enhanced Measures)
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 safety of product use and are particularly important in pipes and structural products.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
（1）Raw material degradation causes the molecular weight to decrease
（2）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 proportion is too high
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solution
（1）Control the barrel temperature within the range of 180-230°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 proportion to no more than 20%
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
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.
Targeted preventive measures need to be taken in different production scenarios.
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