Processing Machinery
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Mechanical properties of random copolymer polypropylene pipe special material extruded products not up to standard (Variant: mass production scenario)
Fenómeno do problema
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, in continuous mass production, this problem is more prominent and needs key attention.
Análise das causas
（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）In continuous mass production, process parameter fluctuations or equipment status changes have aggravated this problem
Solução
（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 establish standardized work instructions, with special attention to parameter stability in continuous mass production
Conclusão principal
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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