Material Analysis
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Mechanical properties of linear low-density polyethylene extruded products not meeting standards
Fenómeno del problema
Product tensile strength, impact strength or pressure resistance is lower than standard requirements.
Mechanical properties not meeting standards directly affect product safety in use, which is especially important in pipes and structural products.
Análisis de la causa
(1) Raw material degradation causes molecular weight reduction
(2) Uneven plasticization; there are unmelted particles in the melt
(3) Improper cooling rate results in inappropriate crystallinity
(4) Product wall thickness is insufficient or there are bubbles
(5) The regrind proportion is too high
Solución
(1) Control barrel temperature within the 190-250°C range to avoid overheating degradation
(2) Optimize screw design and speed to ensure full plasticization
(3) Adjust cooling conditions to ensure appropriate crystallinity
(4) Check product wall thickness and internal quality, and eliminate bubbles
(5) Control the regrind proportion to no more than 20%
Conclusión clave
Mechanical properties not meeting standards are caused by material degradation or poor processing quality and need to be solved from temperature control and plasticization quality.
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