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