METHOD OF BLEACHING LINEN FIBRES FOR PRODUCTION OF MEDICAL SUPPLIES Russian patent published in 2014 - IPC D06L3/02 

FIELD: textiles, paper.

SUBSTANCE: method of bleaching linen fibres for production of medical supplies is proposed, consisting in that the following operations are carried out in sequence: treatment with sulphuric acid solution and subsequent washing at a temperature of 25-30°C for 25-30 minutes, oxidative cooking with the alkaline solution of hydrogen peroxide containing stabiliser, in stages for various values of the silicate-alkali modulus, first at a temperature of 20-25°C at a module of 0.5-0.6 for 10-15 minutes, then at a module of 0.8-0.9 for 10-20 minutes, and then at a module of 1.0-1.1 for 30-60 minutes at a temperature of 70-75°C, after that the temperature is raised to 96-98°C and maintained for 30-60 minutes, then the module is reduced to 0.4-0.5 and cooking is continued for 30-60 minutes, bleaching in the alkaline solution containing the same substance as the solution for the oxidative cooking, washing with water and final oxidation with aqueous solution of acetic acid.

EFFECT: invention enables to improve the efficiency, environmental friendliness of the method and to obtain bleached fibres with high properties of bleaching, capillary capacity, normalised content of chloride, calcium and sulphate salts.

4 cl, 2 tbl