Viscose fiber is based on natural cellulose (pulp hectometer) raw material, spinning again after the yellow acid ester solution into fiber and regenerated cellulose fiber. In the production of viscose fiber solidification process, dilute sodium hydroxide and sulfuric acid in the solidification bath reaction to form glauberite (sodium silicate powder). From the perspective of waste liquid recovery, the quality of sodium sulfate recovered from waste liquid in the process of viscose silk production is relatively good. The quality inspection report shows that the advantages of viscose fiber by-product sodium sulfate products are: good whiteness, high product content, low chloride ion content, low production cost and flexible sales price; The disadvantage of the product is: fine particle size, easy to caking, PH value acidic. Viscose fiber by-product powder is suitable for glass, paper and other downstream industries.
China is a major producer of chemical fiber and a strong producer in development. In recent years, the recycled cellulose fiber industry in our country is mainly staple fiber, with an production capacity of about 5 million tons. According to the statistics of Yuanming powder industry information public platform, the production of sodium byproduct sulfate in chemical fiber industry accounts for about half of the total production of sodium byproduct sulfate in the country, which is the highest in many kinds of sodium byproduct sulfate industry at present.
Viscose staple fiber belongs to the regeneration fiber of natural cellulose, and cotton and polyester staple fiber belong to the three major cotton spinning raw materials. It is made of natural cellulose (pulp) as the basic raw material, through alkalination, aging, sulfonation and other processes into soluble cellulose sulfonate, then dissolved in dilute lye to make viscose, by wet spinning and made.
According to statistics, in 2021, China's viscose fiber output was 4.031 million tons, an increase of 1.93% compared with 2020. According to the fiber length, viscose fiber can be divided into viscose staple fiber and viscose filament. In 2021, the output of viscose staple fiber reached 3.87 million tons, with a year-on-year increase of 2.12%; Viscose filament production was 161,000 tons, down 2.42% year-on-year.
Post time: Jan-17-2023
