Material Analysis
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Mechanical properties of low density polyethylene extruded products not up to standard
Problem Phenomenon
Product tensile strength, impact strength, or pressure resistance is lower than standard requirements.
Substandard mechanical properties directly affect product use safety, especially important in pipes and structural products.
Cause Analysis
(1) Raw material degradation reduces molecular weight
(2) Uneven plasticization, unmelted particles in the melt
(3) Improper cooling rate, inappropriate crystallinity
(4) Insufficient product wall thickness or bubbles present
(5) Regrind ratio too high
Solution
(1) Control barrel temperature within the 160-220°C range, avoid overheating degradation
(2) Optimize screw design and rotation speed, ensure full plasticization
(3) Adjust cooling conditions, ensure appropriate crystallinity
(4) Check product wall thickness and internal quality, eliminate bubbles
(5) Control regrind ratio not exceeding 20%
Key Takeaway
Substandard mechanical properties are caused by material degradation or poor processing quality; they need to be solved from temperature control and plasticizing quality.
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