Method to bleach cellulose-containing textile materials

FIELD: textile, paper.

SUBSTANCE: cellulose-containing textile material is processed in a bleaching solution, which contains hydrogen peroxide, diarin, which is a mixture of aqueous solutions of sodium salts of phosphorus-containing complexons, carbamide, a penetrating agent EM. Diarin is mixture of aqueous solutions of sodium salts of phosphorus-containing complexons. The penetrating agent EM is a composition based on anion-active and non-ionogenic surfactants. Besides, treatment in the bleaching solution is carried out simultaneously with ultrasonic exposure at the frequency of 25-35 kHz, capacity of 1.5-2.5 kW for 20-30 minutes.

EFFECT: invention makes it possible to considerably reduce power inputs, to increase material quality, to improve process ecological compatibility and to reduce its labour intensiveness.

1 tbl

 

The technical field

The present invention relates to a method of bleaching cellulose-containing textile materials and can be used in the textile industry for the preparation of materials before dyeing and printing or to obtain bleached materials.

The level of technology

There is a method of bleaching cotton fabric in which the fabric is first subjected to a process rasshifrovka, and then bleached for 60 minutes in alkaline peroxide solution using ultrasound [Safonov V.V. the Influence of ultrasound on the process of bleaching cotton fabric. / Book of abstracts "textile-2005), MSTU n.a. Kosygin, 2005. - p.61]. This method allows to intensify the process of bleaching, however, retained the two-stage processing of cotton fabric.

Closest to the claimed method, in essence, that is the prototype, is a method of blanching viscose knitted fabric with ultrasound with a frequency of 20 to 22 kHz and a power of 4 kW [Vthermal. Application of ultrasound for the treatment of textile materials / M: Light industry, 1969, p.44-45].

The method is carried out consistent with carrying out the following operations:

1) fill up the fabric in cold water;

2) pour the drugs, g/l: hydrogen peroxide (in recalculation on 100%) - 10; caustic soda - 2; silicate NAT is s - 15. When this occurs immediately fabric processing, as the drugs begin to act;

3) increase the temperature from 30°C to 70°C for 20 minutes;

4) when it reaches 70°C start processing tissues in whitening solution, ultrasound with a frequency of 20 kHz and a power of 4 kW for 20 minutes.

5) cooling the fabric to 40°C, without removing from the whitening solution for 20 minutes while continuing to ultrasound treatment;

6) unload the fabric.

The total processing time viscose knitted fabric is 110 minutes.

The disadvantages of the prototype is the following.

1) High intensity method, as electric power is required not only to ultrasonic treatment, but also for heating whitening solution to 70°C. and maintaining this temperature for 40 minutes.

2) the Low quality of the bleached material, shown in the following figures:

- low strength properties, characterized by a tenacity;

low white, above 80%;

low capillarity, not higher than 100 mm

3. The use of caustic soda in the recipe whitening solution complicates the cleaning process wastewater from textile enterprises and degrades the environment for staff;

4. The multistage and the complexity of the technological cycle of the bleaching material.

Somnos the ü inventions

The objective of the invention is a search method of bleaching cellulosic textile materials by processing them in a whitening solution that includes hydrogen peroxide, when exposed to ultrasound, which would:

1) significantly reduce the energy consumption due to the exclusion of the technological cycle of the heating stage whitening solution ferry to 70°C and maintain this temperature for 40 minutes.

2) to improve the quality of the bleached material in the form of:

- high strength characteristics, characterized by tenacity;

- high white;

- high levels of capillarity for materials of different types;

3) improve the environment for staff and characteristics of the waste process water due to the exclusion of caustic soda from the whitening solution;

4) to carry out the process in one stage, and reduce the complexity.

The problem is solved by the method of bleaching cellulosic textile materials by processing them in a whitening solution that includes hydrogen peroxide, when exposed to ultrasound, in which the influence of ultrasound start simultaneously with the start of the processing in the whitening solution at a frequency of 25-35 kHz, a power of 1.5 to 2.5 kW for 20-30 min, with whitening solution is further added urea, diary is, representing a mixture of aqueous solutions of sodium salts of phosphate-based chelating agents, and wetting EM, which is the composition on the basis of anion active and non-ionic surfactants, with the following content of components, g/l:

hydrogen peroxide- 4-6
diurin- 4-5
ureaand 1.5 - 2.5
the wetting EM- 0,5-1,0

The claimed invention provides the following advantages:

- significant reduction of energy consumption due to the exclusion of the technological cycle of the heating stage whitening solution ferry to 70°C and maintain this temperature for 40 minutes.

- getting bleached material of higher quality, with:

- high strength properties to cellulosic textile fabrics, characterized by tenacity;

- high white - up to 84%;

- high capillarity - up to 170 mm for textile materials of different types;

- the improvement of the environment for staff and characteristics of waste those is technological in water due to the exclusion of caustic soda from the whitening solution;

- implementation of bleaching textile material in single-stage mode, which significantly reduces the complexity of the process.

Information regarding the playback of the invention.

The claimed method can be used to handle not only the knitted fabric, but the fabric of the wide range of products: cotton and fabric of a mixture of natural and chemical fibers.

For implementing the method using the following ingredients:

- Hydrogen peroxide - GOST 10929-76.

- Drug "Diary" - is a noninteracting mixture of aqueous solutions of sodium salts of phosphate chelating agents of different compositions. The drug is soluble in water in any relationship. THE 2638-023-17965829-98.

- Urea - GOST 2081-92.

- Wetting EM is allopenna composition on the basis of anion active and non-ionic surfactants. The wetting EM well soluble in water. THE 2484-053-17965829-2000.

The invention is carried out consistent with carrying out the following operations.

1. The material is placed in a whitening solution containing hydrogen peroxide, diary, urea, wetting EM, taken in the right quantities, and immediately start processing the ultrasound.

2. Maintain the material in whitening solution when exposed to ultrasound with a frequency of 25-35 kHz and a power of 1.5 to 2.5 kW for 20-30 min is so During this time the temperature of the whitening solution under the action of ultrasound rises to 70°C, as the fluid in the field of ultrasonic waves is heated due to the absorption of acoustic energy, which is partially transformed into heat.

3. Unload the material.

The total processing time of 40-50 minutes.

Qualitative indicators of cellulosic fabrics treated with the prototype and the claimed method was determined in the same manner:

- white - according to GOST 18054-72 (Fabric textile. Methods for the determination of white fabric).

- capillarity - according to GOST 3816-81 (Fabric textile. Methods for determination of hygroscopic and water-repellent properties).

the tissue damage was determined from the value of the breaking load of GOST 3813-72 (Fabric and textile piece goods. Methods for the determination of explosive properties).

Qualitative indicators of textile materials, processed under various conditions shown in the table. To obtain the correct comparative data were processed viscose knitted fabric (WWII-100%) of the prototype with the following concentrations of components of the whitening solution: hydrogen peroxide - 10; caustic soda - 2, sodium silicate - 15.

The method of bleaching cellulosic textile materials by processing them in whitening solution including peroxide water is ode when exposed to ultrasound, characterized in that the exposure to ultrasound start simultaneously with the start of the processing in the whitening solution at a frequency of 25-35 kHz, a power of 1.5 to 2.5 kW for 20-30 min, with whitening solution is further added urea, diary, representing a mixture of aqueous solutions of sodium salts of phosphate-based chelating agents, and wetting EM, which is the composition on the basis of anion active and non-ionic surfactants, with the following content of components, g/l:

hydrogen peroxide4-6
diurin4-5
urea1.5 to 2.5
the wetting EM0,5-1,0



 

Same patents:

FIELD: textile, cotton.

SUBSTANCE: invention refers to the textile industry in particular, to the technology of the bleaching of flax-containing fabrics and can be used for the production of the bleached woven linens or for the preparation of the fabrics for colouring and stamping. It describes the method of the fermentation and peroxide bleaching of the flax-containing fabrics including enzymatic procession by the soaking into the 40-45°C solution of the multienzyme preparation with the indicator the enzyme activity, in un/ml: endopolygalacturonase - 7-10; α-amylase - 8.8-9.2; β- amylase - 0.5-0.6; γ- amylase - 0.2-0.5; pectinesterase - 1.0-1.5; exopolygalacturonase - 0.5-0.7; exogalactosidase - 0.3-0.4; exoxylosidase - 0.2-0.3; exoglucanase - 0.3-0.5, with the addition of the sodium bicarbonate 20-25 g/l and penetrating agent, maturing the wet squeezed fabric and its steaming in 85-95°C temperature during 20-30 min.; intermediate washing with the acidification in oxalic acid solution 2.5-5 g/l, high-temperature peroxide bleaching by the stabilised alkaline-peroxide solution with the peroxide concentration 2.2-2.9 g/l with active oxygen for one stage, washing and drying.

EFFECT: invention helps to increase the level of the removal of starch size before peroxide bleaching up to 80-85%; it increases the speed of the capillary soaking of water solution and improves uniformity of the capillary characteristics of the fabric; it increases the strength properties of the fabric, decreases its rigidity to 96-125 mN·cm2 because of larger removal of the lignin; it decreases the attenuationof the dyeing of colour warpings of the tapestry linens; it simplifies the process and reduce its duration.

2 cl, 1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns method of flaxen roving preparation for spinning and can be applied in textile industry. Method of enzyme and peroxide preparation of highly lignified flaxen roving for spinning involves deacidification, enzyme processing at 40-50°C for 90-95 minutes by polyenzyme preparation solution with enzyme activity indicators, units per ml: endopolygalacturonase - 20-25; pectinesterase - 2.5-4.7; protease - 0.2-0.3; exopolygalacturonase - 0.6-0.1; exogalactosidase - 0.2-0.4; exoxylosidase - 0.3-0.5; and exoglucanase - 0.6-0.8. Further the roving is heated to the boiling point and matured for 20-25 minutes, flushed by water and processed for 90-95 minutes in alkaline peroxide solution at hydro peroxide concentration of 0.6-0.8 g/l of active oxygen and total alkalinity of 6.5-7.0 g/l rated per caustic soda. Then the roving is flushed with detergent and water and undergoes counter-microbe processing.

EFFECT: fiber whitening degree enhanced up to 54-56%; obtainment of thin yarn meeting the requirements for both "1 high-flaxen" and "1 high tow" grades by GOST 10078-85 in line density and line density and tear load variation rates; reduced yarn tear rate in weaving process to 40-50 tears for 100 spindles per hour; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns method of flaxen roving preparation for spinning and can be applied in textile industry. Method of enzyme and peroxide preparation of flaxen roving for spinning involves deacidification performed before enzyme processing for 90-95 minutes by polyenzyme preparation solution with enzyme activity indicators, units per ml: endopolygalacturonase - 20-25; pectinesterase - 0.8-4.7; protease - 0.2-0.3; and exopolygalacturonase - 0.2-0.4. Further the roving is flushed by water and processed for 90-95 minutes in alkaline peroxide solution at hydro peroxide concentration of 0.4-0.5 g/l of active oxygen and total alkalinity of 6.5-7.0 g/l rated per caustic soda, then flushed with detergent and water and undergoes counter-microbe processing.

EFFECT: reduced tear load in moist unprocessed roving up to 50-61%; obtainment of thin yarn meeting the requirements for 1 grade in thickness and stability of physical and chemical yarn properties; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns methods of flax fiber dyeing and preparation for spinning and can be applied in textile industry. Combined method of dyeing and preparation for spinning involves deacidification, processing by digester dye solution for 90-95 minutes at 40-50°C, the solution including vat colour, sodium bicarbonate, sulfonol NP-3 and anhydrous synthanol, polyenzyme preparation with enzyme activity indicators, units per ml of solution: endopolygalacturonase - 20-40; pectinesterase - 2.5 - 8.0; protease - 0.2-0.4; exopolygalacturonase - 0.6-1.5; exogalactosidase - 0.3-0.5; exoxylosidase - 0.3-0.8; exoglucanase - 0.4-1.0. Further the mass is heated to the boiling point, matured for 30-60 minutes, flushed by cold water. Oxidising processing is performed for 15-25 minutes at 20-25°C in stabilised peroxide solution including 0.3-0.4 g/l of hydro peroxide (100%), 1-2 g/l of laundry soap, and alkaline agents to comprise total alkalinity of 5.5-6.0 g/l rated per caustic soda, with further heating for 20-50 minutes to 95-100°C and maturing for 20-30 minutes, followed by double flush with detergent first and with water next, and further deacidification at 45-50°C for 15-20 minutes and flushing.

EFFECT: reduced irregularity of geometrical parametres and durability of flax semiproducts; improved colorability and colour evenness of textile semiproducts; more environment-friendly process and improved labour health.

1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to bleaching compositions, which in fact do not contain peroxide bleaches, for bleaching of fabrics. Described is liquid bleaching composition with pH 10 or lower, which contains: (a) complex compound of transitional metal as catalyst of bleaching in air, (b) from 0.001 for 3 wt/wt % of odorant.

EFFECT: obtaining composition, whose bleaching activity is more, than 10 times higher as compared with bleaching activity of composition, containing as odorant molar equivalent of citronellal.

5 cl, 3 tbl, 62 ex

FIELD: chemistry.

SUBSTANCE: particles contain inner coating layer that consist of at least one hydrate-forming mineral salt, and outer coating layer, including 0.2-3 wt % alkali metal silicate with module more than 2.5, particularly 3 to 5. Outer layer is obtained using alkali metal silicate solution with alkali metal silicate concentration 2 to 20 wt %. Dissolution time can be extended by alkali metal silicate concentration lowering in solution used, coating material amount being the same. Dissolution time can be extended significantly according to coating layers sequence and solution concentration with low quantity of alkali metal silicate.

EFFECT: extension of dissolution time.

18 cl, 7 tbl, 18 ex

FIELD: process for treatment of textile materials, in particular, whitening of flax fiber for producing of hygroscopic wool used for medicine purposes.

SUBSTANCE: method involves subjecting flax fiber to oxidizing cooking followed by whitening with the use of hydrogen peroxide in the presence of stabilizing preparation based on oxyethylidene diphosphonic acid; after final rinsing, providing brightening processing, preferably with the use of solution containing higher fatty acid based softener used in an amount of 0.5-1.0 g/l. Method is realized in industrial plants with the use of proper equipment and chemical substances available and produced on industrial scale by home enterprises. Said method does not require substantial alterations in chemical processes.

EFFECT: increased whitening extent, capillarity and moisture absorbing capacity of wool produced.

2 tbl, 5 ex

FIELD: light industry, in particular, raw material dyeing processes used, for example, in whitening of mink skin fur hair.

SUBSTANCE: method involves providing additional tinning of skin with aqueous composition containing sodium chloride, composition based on low-molecular alcohol polyacetals, mixture of non-ionogen surfactants and cyclic terpenes; whitening for 2.0-4.5 hours with the use of aqueous composition containing sodium chloride, potassium persulfate, composition based on mineral and organic acids as pH stabilizers, mixture of primary fatty alcohols as protective admixture and 30%-hydrogen peroxide; providing reduction with the use of aqueous composition comprising sodium chloride, oxalic acid and mixture of non-ionogen surfactants with cyclic terpenes.

EFFECT: improved consumer properties of fur skins.

2 tbl

FIELD: light and fur industry.

SUBSTANCE: invention relates to a composition used for whitening hair cover of fur hides. The composition comprises sodium chloride, hydrogen peroxide, potassium persulfate, the composition based on mineral and organic acid salts - "Antikolor 1" or "Antikolor-2" as an agent for stabilizing pH value, and a mixture of primary saturated alcohols - "Antikolor-3" as a protective additive. The composition provides reducing the negative effect of leather and hair cover of hide. The composition can be used in raw-dye manufacture in treatment of hides with pigmented hair cover, for example, hides of karakul group.

EFFECT: valuable properties of composition.

2 tbl

FIELD: textile industry.

SUBSTANCE: composition contains hydrogen peroxide, aqueous ammonia, silicate-containing hydrogen peroxide stabilizer, nonionic or anionic surfactant, and water, said stabilizer being, in particular, taken separately or in various proportions to each other substances selected from group including kaolin, talc, bentonite, zeolite sorbent, and diatomite.

EFFECT: reduced loss in strength, felting tendency, and rigidity of textiles.

2 tbl, 6 ex

FIELD: textile industry.

SUBSTANCE: composition contains hydrogen peroxide, aqueous ammonia, silicate-containing hydrogen peroxide stabilizer, nonionic or anionic surfactant, and water, said stabilizer being, in particular, taken separately or in various proportions to each other substances selected from group including kaolin, talc, bentonite, zeolite sorbent, and diatomite.

EFFECT: reduced loss in strength, felting tendency, and rigidity of textiles.

2 tbl, 6 ex

FIELD: light and fur industry.

SUBSTANCE: invention relates to a composition used for whitening hair cover of fur hides. The composition comprises sodium chloride, hydrogen peroxide, potassium persulfate, the composition based on mineral and organic acid salts - "Antikolor 1" or "Antikolor-2" as an agent for stabilizing pH value, and a mixture of primary saturated alcohols - "Antikolor-3" as a protective additive. The composition provides reducing the negative effect of leather and hair cover of hide. The composition can be used in raw-dye manufacture in treatment of hides with pigmented hair cover, for example, hides of karakul group.

EFFECT: valuable properties of composition.

2 tbl

FIELD: light industry, in particular, raw material dyeing processes used, for example, in whitening of mink skin fur hair.

SUBSTANCE: method involves providing additional tinning of skin with aqueous composition containing sodium chloride, composition based on low-molecular alcohol polyacetals, mixture of non-ionogen surfactants and cyclic terpenes; whitening for 2.0-4.5 hours with the use of aqueous composition containing sodium chloride, potassium persulfate, composition based on mineral and organic acids as pH stabilizers, mixture of primary fatty alcohols as protective admixture and 30%-hydrogen peroxide; providing reduction with the use of aqueous composition comprising sodium chloride, oxalic acid and mixture of non-ionogen surfactants with cyclic terpenes.

EFFECT: improved consumer properties of fur skins.

2 tbl

FIELD: process for treatment of textile materials, in particular, whitening of flax fiber for producing of hygroscopic wool used for medicine purposes.

SUBSTANCE: method involves subjecting flax fiber to oxidizing cooking followed by whitening with the use of hydrogen peroxide in the presence of stabilizing preparation based on oxyethylidene diphosphonic acid; after final rinsing, providing brightening processing, preferably with the use of solution containing higher fatty acid based softener used in an amount of 0.5-1.0 g/l. Method is realized in industrial plants with the use of proper equipment and chemical substances available and produced on industrial scale by home enterprises. Said method does not require substantial alterations in chemical processes.

EFFECT: increased whitening extent, capillarity and moisture absorbing capacity of wool produced.

2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: particles contain inner coating layer that consist of at least one hydrate-forming mineral salt, and outer coating layer, including 0.2-3 wt % alkali metal silicate with module more than 2.5, particularly 3 to 5. Outer layer is obtained using alkali metal silicate solution with alkali metal silicate concentration 2 to 20 wt %. Dissolution time can be extended by alkali metal silicate concentration lowering in solution used, coating material amount being the same. Dissolution time can be extended significantly according to coating layers sequence and solution concentration with low quantity of alkali metal silicate.

EFFECT: extension of dissolution time.

18 cl, 7 tbl, 18 ex

FIELD: chemistry.

SUBSTANCE: invention relates to bleaching compositions, which in fact do not contain peroxide bleaches, for bleaching of fabrics. Described is liquid bleaching composition with pH 10 or lower, which contains: (a) complex compound of transitional metal as catalyst of bleaching in air, (b) from 0.001 for 3 wt/wt % of odorant.

EFFECT: obtaining composition, whose bleaching activity is more, than 10 times higher as compared with bleaching activity of composition, containing as odorant molar equivalent of citronellal.

5 cl, 3 tbl, 62 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns methods of flax fiber dyeing and preparation for spinning and can be applied in textile industry. Combined method of dyeing and preparation for spinning involves deacidification, processing by digester dye solution for 90-95 minutes at 40-50°C, the solution including vat colour, sodium bicarbonate, sulfonol NP-3 and anhydrous synthanol, polyenzyme preparation with enzyme activity indicators, units per ml of solution: endopolygalacturonase - 20-40; pectinesterase - 2.5 - 8.0; protease - 0.2-0.4; exopolygalacturonase - 0.6-1.5; exogalactosidase - 0.3-0.5; exoxylosidase - 0.3-0.8; exoglucanase - 0.4-1.0. Further the mass is heated to the boiling point, matured for 30-60 minutes, flushed by cold water. Oxidising processing is performed for 15-25 minutes at 20-25°C in stabilised peroxide solution including 0.3-0.4 g/l of hydro peroxide (100%), 1-2 g/l of laundry soap, and alkaline agents to comprise total alkalinity of 5.5-6.0 g/l rated per caustic soda, with further heating for 20-50 minutes to 95-100°C and maturing for 20-30 minutes, followed by double flush with detergent first and with water next, and further deacidification at 45-50°C for 15-20 minutes and flushing.

EFFECT: reduced irregularity of geometrical parametres and durability of flax semiproducts; improved colorability and colour evenness of textile semiproducts; more environment-friendly process and improved labour health.

1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns method of flaxen roving preparation for spinning and can be applied in textile industry. Method of enzyme and peroxide preparation of flaxen roving for spinning involves deacidification performed before enzyme processing for 90-95 minutes by polyenzyme preparation solution with enzyme activity indicators, units per ml: endopolygalacturonase - 20-25; pectinesterase - 0.8-4.7; protease - 0.2-0.3; and exopolygalacturonase - 0.2-0.4. Further the roving is flushed by water and processed for 90-95 minutes in alkaline peroxide solution at hydro peroxide concentration of 0.4-0.5 g/l of active oxygen and total alkalinity of 6.5-7.0 g/l rated per caustic soda, then flushed with detergent and water and undergoes counter-microbe processing.

EFFECT: reduced tear load in moist unprocessed roving up to 50-61%; obtainment of thin yarn meeting the requirements for 1 grade in thickness and stability of physical and chemical yarn properties; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns method of flaxen roving preparation for spinning and can be applied in textile industry. Method of enzyme and peroxide preparation of highly lignified flaxen roving for spinning involves deacidification, enzyme processing at 40-50°C for 90-95 minutes by polyenzyme preparation solution with enzyme activity indicators, units per ml: endopolygalacturonase - 20-25; pectinesterase - 2.5-4.7; protease - 0.2-0.3; exopolygalacturonase - 0.6-0.1; exogalactosidase - 0.2-0.4; exoxylosidase - 0.3-0.5; and exoglucanase - 0.6-0.8. Further the roving is heated to the boiling point and matured for 20-25 minutes, flushed by water and processed for 90-95 minutes in alkaline peroxide solution at hydro peroxide concentration of 0.6-0.8 g/l of active oxygen and total alkalinity of 6.5-7.0 g/l rated per caustic soda. Then the roving is flushed with detergent and water and undergoes counter-microbe processing.

EFFECT: fiber whitening degree enhanced up to 54-56%; obtainment of thin yarn meeting the requirements for both "1 high-flaxen" and "1 high tow" grades by GOST 10078-85 in line density and line density and tear load variation rates; reduced yarn tear rate in weaving process to 40-50 tears for 100 spindles per hour; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

1 tbl, 3 ex

FIELD: textile, cotton.

SUBSTANCE: invention refers to the textile industry in particular, to the technology of the bleaching of flax-containing fabrics and can be used for the production of the bleached woven linens or for the preparation of the fabrics for colouring and stamping. It describes the method of the fermentation and peroxide bleaching of the flax-containing fabrics including enzymatic procession by the soaking into the 40-45°C solution of the multienzyme preparation with the indicator the enzyme activity, in un/ml: endopolygalacturonase - 7-10; α-amylase - 8.8-9.2; β- amylase - 0.5-0.6; γ- amylase - 0.2-0.5; pectinesterase - 1.0-1.5; exopolygalacturonase - 0.5-0.7; exogalactosidase - 0.3-0.4; exoxylosidase - 0.2-0.3; exoglucanase - 0.3-0.5, with the addition of the sodium bicarbonate 20-25 g/l and penetrating agent, maturing the wet squeezed fabric and its steaming in 85-95°C temperature during 20-30 min.; intermediate washing with the acidification in oxalic acid solution 2.5-5 g/l, high-temperature peroxide bleaching by the stabilised alkaline-peroxide solution with the peroxide concentration 2.2-2.9 g/l with active oxygen for one stage, washing and drying.

EFFECT: invention helps to increase the level of the removal of starch size before peroxide bleaching up to 80-85%; it increases the speed of the capillary soaking of water solution and improves uniformity of the capillary characteristics of the fabric; it increases the strength properties of the fabric, decreases its rigidity to 96-125 mN·cm2 because of larger removal of the lignin; it decreases the attenuationof the dyeing of colour warpings of the tapestry linens; it simplifies the process and reduce its duration.

2 cl, 1 tbl, 3 ex

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