Extrusion & Post
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Insufficient Breaking Strength of Polypropylene PP Fiber
Problem Phenomenon
The tensile breaking strength of PP spun fiber is lower than the standard requirement, affecting the mechanical properties of fiber products.
Insufficient strength causes fiber breakage during use, affecting product quality.
Cause Analysis
(1) The MFR of the raw material is improper, and the molecular weight is low
(2) The spinning temperature is too high, causing molecular degradation
(3) The cooling and forming conditions are improper
(4) The draw ratio is insufficient or the drawing temperature is improper
(5) Impurities in the raw material cause fiber breakage
Solution
(1) Select a fiber-grade PP grade, with MFR 10-30g/10min
(2) Control the spinning temperature at a reasonable value within the range of 200-280°C to prevent degradation
(3) Optimize the side air blowing cooling conditions
(4) Increase the draw ratio to 4-6 times, and control the drawing temperature at 130-150°C
(5) Sieve the raw material to remove impurities, and install a magnetic frame on the hopper
Key Takeaway
Insufficient PP fiber strength is caused by improper raw material selection or process parameters, and needs to be optimized from the material grade and drawing conditions.
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