Process for the extraction and preparation of bast fibers, bast fibers obtained therefrom and their use
First Claim
1. A process for the extraction and preparation of bast fibers, comprises ramie, hemp or flax is subjected to two times of bleaching, two times of alkali boiling, and a step of high-temperature loosening, wherein the two times of bleaching are chlorine bleaching and oxygen bleaching respectively, and in the chlorine bleaching, sodium hypochlorite having a concentration of 3-8 g/L is used, the temperature is 35-45°
- C., and the duration is 40-80 minutes;
in the oxygen bleaching, hydrogen peroxide of 4-6 g/L is used, the temperature is 80-100°
C., and the duration is 40-80 minutes;
in the alkali boilings, the first alkali boiling is performed by use of caustic soda;
high-temperature loosening is performed after the bleaching and boiling, and in the high-temperature loosening, soda of 100-140 g/L is used, the temperature is 100-140°
C., and the duration is 1.5-2.5 hours.
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Abstract
The present invention generally relates to a process for the extraction and preparation of bast fibers with high quality and high counts. The process is suitable for ramie, hemp and flax. The present invention also relates to bast fibers with high counts produced according to the process, as well as pure yarns and mixed, blended yarns made from said bast fibers.
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Citations
5 Claims
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1. A process for the extraction and preparation of bast fibers, comprises ramie, hemp or flax is subjected to two times of bleaching, two times of alkali boiling, and a step of high-temperature loosening, wherein the two times of bleaching are chlorine bleaching and oxygen bleaching respectively, and in the chlorine bleaching, sodium hypochlorite having a concentration of 3-8 g/L is used, the temperature is 35-45°
- C., and the duration is 40-80 minutes;
in the oxygen bleaching, hydrogen peroxide of 4-6 g/L is used, the temperature is 80-100°
C., and the duration is 40-80 minutes;
in the alkali boilings, the first alkali boiling is performed by use of caustic soda;
high-temperature loosening is performed after the bleaching and boiling, and in the high-temperature loosening, soda of 100-140 g/L is used, the temperature is 100-140°
C., and the duration is 1.5-2.5 hours. - View Dependent Claims (2, 3, 4, 5)
- C., and the duration is 40-80 minutes;
Specification