Extrusion & Post
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PP Flat Filament Drawing Breakage
Problem Phenomenon
PP woven bag flat filaments frequently break during drawing, with high waste rate, reduced capacity, and uneven filament strength.
Cause Analysis
Gel particles, impurities, or unplasticized particles in the film become fracture initiation points; improper drawing temperature (too high softening, too low brittle), excessive draw ratio, and uneven oven temperature all make local stress exceed filament strength.
Solution
①Ensure raw material filtration precision to reduce gel particles and impurities; ②optimize drawing temperature and ensure uniform oven temperature; ③adjust draw ratio to the material's bearable range; ④check film thickness uniformity; ⑤stabilize extrusion plasticization to reduce unplasticized particles.
Key Takeaway
For PP flat filament breakage, first check the film's 'innate quality' (gel particles, impurities, thickness), then adjust drawing temperature and ratio; drawing amplifies film defects—if the film fails, it breaks no matter how you adjust afterward.
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