METHOD FOR PRODUCTION OF REFINED FLAX FIBER Russian patent published in 2009 - IPC D01B1/10 D01G21/00 D01C1/02 

FIELD: textile fabrics, paper.

SUBSTANCE: method for production of refined flax fiber includes preliminary mechanical treatment with application of tillage with simultaneous shortening of fibers and separation of solid particles, acidification, oxidising digestion and treatment of peroxide containing solution. Preliminary mechanical treatment is carried out by means of successive tillage with simultaneous shortening of fiber, separation of solid particles performed by simultaneous action of air centrifugal flow and multiple impact action with application of picker rollers at the rate of their rotation of 700-1200 rpm, repeated tillage with simultaneous shortening of fibers to average masslength of 35-55 mm and repeated separation of hard particles by method specified above, and prior to acidification for 30-60 minutes fiber is exposed to treatment at the temperature of 30-50°C by solution containing (g/l): caustic soda - 2.0-5.0, penetrating agent - 0.2-0.5, afterwards it is flushed by water.

EFFECT: production of highly pure flax fiber with high yield of alpha-cellulose, low residual content of natural admixtures, high rate of wetting and low extent of polymerisation.

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