Processing Machinery
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Mechanical properties of random copolymer polypropylene pipe special material extruded products not up to standard (Variant: strengthened measures)
Problembeschreibung
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.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Ursachenanalyse
（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
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Lösung
（1）Control the barrel temperature within the range of 200-220°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%
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Wichtigste Erkenntnis
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.
In different production scenarios, targeted preventive measures need to be taken.
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