Material Analysis
2 views
Substandard Mechanical Properties of High-Density Polyethylene Extruded Products
Problem Phenomenon
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.
Cause Analysis
（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
Solution
（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%
Key Takeaway
Substandard mechanical properties are caused by material degradation or poor processing quality, and need to be solved from temperature control and plasticization quality.
Was this helpful?
0 people found this helpful
Thank you for your feedback!