Material Analysis
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Mechanical properties of heat-resistant polyethylene extruded products not meeting standard
Problem Phenomenon
The tensile strength, impact strength or pressure resistance of the product is lower than the standard requirements.
Failure of mechanical properties to meet standards directly affects product use safety, especially in pipes and structural products.
Cause Analysis
(1) Raw material degradation causes molecular weight reduction
(2) Plasticization uneven, unmelted particles in the melt
(3) Improper cooling rate, unsuitable crystallinity
(4) Product wall thickness insufficient or has bubbles
(5) Regrind ratio too high
Solution
(1) Control barrel temperature within 190-230°C to avoid overheating degradation
(2) Optimize screw design and rotation speed to ensure full plasticization
(3) Adjust cooling conditions to ensure suitable crystallinity
(4) Check product wall thickness and internal quality, eliminate bubbles
(5) Control regrind ratio not exceeding 20%
Key Takeaway
Failure of mechanical properties to meet standards is caused by material degradation or poor processing quality, and needs to be solved from temperature control and plasticizing quality.
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