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Split yarn refers to chemical fibers made by longitudinal stretching, tearing and fibrillation of polymer films. Studies have shown that after splitting, split yarn can obtain a higher appropriate degree of orientation, and the strength of split yarn is significantly improved. Long-fiber tensile strength is 2.9 cN/dtex or more, which is 1 times higher than similar domestic products. Above, we have reached the advanced level of similar international products.