Material Analysis
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Mechanical Properties of Polypropylene Extruded Products Not Up to Standard
Problem Phenomenon
The tensile strength, impact strength, or pressure resistance of the product is lower than the standard requirement.
Mechanical properties not up to standard directly affect the use safety of the product, and are especially important in pipes and structural products.
Cause Analysis
(1) Degradation of the raw material leads to a decrease in 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 range of 200-280°C to avoid overheating degradation
(2) Optimize the screw design and rotation speed to ensure full 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 not exceed 20%
Key Takeaway
Mechanical properties not up to standard are caused by material degradation or poor processing quality, and need to be solved from temperature control and plasticization quality.
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