Material Analysis
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Substandard Mechanical Properties of High-Density Polyethylene Extruded Products
Fenómeno del problema
The tensile strength, impact strength, or pressure resistance of the product is lower than the standard requirement.
Substandard mechanical properties directly affect the safety of product use, and are especially important in pipes and structural products.
Análisis de la causa
（1）Raw material degradation leads to reduced 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 unsuitable
（4）The product wall thickness is insufficient or there are bubbles
（5）The regrind ratio is too high
Solución
（1）Control the barrel temperature within the 180-260°C range to avoid overheating degradation
（2）Optimize the screw design and rotation speed to ensure sufficient plasticization
（3）Adjust the cooling conditions to ensure suitable crystallinity
（4）Check the product wall thickness and internal quality to eliminate bubbles
（5）Control the regrind ratio to no more than 20%
Conclusión clave
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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