The natural fiber which is used as textile material can be arranged in thickness sequence as fur, hemp, cotton and silk. The general chemical fiber is usually imitated according to the thinness and performance of natural fiber. Ultrafine fiber which is even thinner than silk was developed out by foreign scientist ten years ago; this fiber had special functions and soon developed quickly. The Japanese and European suppliers cost much for this fiber and completed fiercely, all shapes and colors top grade ultrafine fiber textile had then seized the market. The definition of ultrafine fiber is not consistent. General speaking, the fiber with fibrousness below 0. 3 d (diameter is 5 micron) is called ultrafine fiber. 0. 00009 d ultrafine silk has been developed out by foreign scientist, it is very light, even if pulled from earth to moon, the weight will not exceed 5 g. Now we have the ability to produce 0. 13 d to 0. 3 d ultrafine fiber in domestic market. Thanks to the thin fibrousness, th
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