Processing Machinery
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Mechanical properties of linear low-density polyethylene extruded products not meeting standards (variant: strengthened measures)
Fenómeno do 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.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Análise das causas
(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
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solução
(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%
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusão principal
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.
In different production scenarios, targeted preventive measures need to be taken.
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