Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
  • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
  • D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen

Definitions

• the present invention relates to a method of bleaching natural and artificial fibers and/or filaments and more particularly to a method of bleaching such fibers and/ or filaments with alkaline solutions containing hydrogen peroxide at room temperature.
• the goods after they have been preliminarily cleaned or treated according to the usual known practices as for instance souring, scouring, desizing, boiling, desulphurizing, degumming or other usual preliminary cleaning actions, or preliminarily treated with alkalineor acid hypochlorite solutions, alkaline or acid sulphit'e solutions, hydrosulphites, permanganates, chromates, chlorates, and similar oxidizing or reducing agents, are treated with an alkaline solution of hydrogen peroxide at room or normal temperature by any method whereby the fabric or fiber whether as raw stock, carded, spun, woven, knitted or felted, is thoroughly wet out or saturated with the desired bleaching solution.
• This step will usually include a saturation of the goods, such as by immersion or immersions in the bleaching solution, and an elimination of the surplus bleaching solution above that necessary to saturate the same by any well known means as for instance by squeezing or hydroextracting or by any known device or method, or the goods are saturated by any other convenient methods and permitted to stand in the saturated condition until the desired bleached result is obtained.
• This desired bleached condition is obtained after a period of from several minutes or up to 24 hours or more whereupon the goods are rinsed or the residual solution otherwise removed. It will, of course, be understood that the surplus bleaching. solution squeezed or hydroextracted from the goods may be returned to the main bulk of the bleaching solution and thereafter used to bleach further batches of goods.
• composition of bath which I have found effective in bleaching animal fibers or filaments A composition of bath which I have found effective in bleaching animal fibers or filaments,
• alkali may include materials acting as stabilizers for the hydrogen peroxide solution and may include, among others, silicates of soda, phosphates such as sodium pyro-phosphate, tri-sodium phosphate, di-sodium phosphate, sodium-bicarbonate and borax.
• silicates of soda phosphates such as sodium pyro-phosphate, tri-sodium phosphate, di-sodium phosphate, sodium-bicarbonate and borax.
• additional chemicals or stabilizers not necessarily alkaline in character, may be added to the bath, and other alkaline materials used to obtain the desired alkalinity of the solution.
• bleaching assistants may also be included in the bath and among them may be mentioned soaps, sulphonated oils, solvents of various kinds and wetting-on agents.
• the goods are saturated with the bleaching solution, the surplus bleaching solution above that necessary to saturate the goods is removed and the goods permitted to stand in the saturated condition until the desired degree of bleaching is effected.
• piece goods may be eifectively bleached after saturation by winding them upon rolls.
• the saturated goods may be stacked, piled or stored in any convenient manner in a box, bin or movable container or even on the floor of or in any suitable chamber.
• Effective hydrogen peroxide bleaching is very often obtained in accordance with my invention by subjecting the goods to a double treatment. This is more particularly true in those cases where yarn is treated which would, in accordance with the older and well known methods of bleaching require a double hydrogen peroxide boil such as is done in the bleaching of certain types of cotton yarn.
• the first steep is carried out with a solution containing, as an example:
• Goods which have been mercerized may be bleached by my process without removing caustic soda remaining in the goods after they come from the mercerizing machines. eliminate the usual souring of such goods.
• the top in the bleaching of wool, as for instance wool top, the top, whether scoured or unscoured, is saturated with a suitable peroxide bleaching solution, the surplus removed, as for example by hydro-extraction, and the saturated top allowed to bleach at room temperature until the desired shade is obtained which may require from several minutes to several hours depending upon the character of the wool and its previous treatment and on the type and concentration of bleaching solution.
• a bleaching solution made in accordance with the following composition which is illustrative and not limitative. It will be understood that any alkalis or combinations of alkalis that do not render the solution so alkaline as to tender or yellow the goods may be used.
• room temperature is used herein to describe a range of temperature normally encountered in a plant and may be as high as 115 F. Where such high temperatures are en countered, the time of steeping will be less than that required at lower temperatures in order to obtain a full or standard white.
• a concentration of peroxide is meant wherein the amount of persearch tiooa.
• oxide calculated as hydrogen peroxide, is greater than about 1% of hydrogen peroxide.
• moist condition or damp condition as used in the claims means a condition Where the goods contain at least 50% by weight of liquid but are not immersed in the liquid.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Detergent Compositions (AREA)
• Paper (AREA)
• Cosmetics (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)

Priority Applications (5)

Applications Claiming Priority (5)

Publications (1)

Family

ID=10323838

Family Applications (2)

Family Applications After (1)

Country Status (4)

Cited By (18)

Families Citing this family (4)

• 1934
  • 1934-03-08 US US714735A patent/US2107297A/en not_active Expired - Lifetime
• 1937
  • 1937-02-10 US US125113A patent/US2165270A/en not_active Expired - Lifetime
  • 1937-11-16 GB GB31489/37A patent/GB507664A/en not_active Expired
  • 1937-11-27 FR FR830046D patent/FR830046A/fr not_active Expired
  • 1937-12-31 BE BE425547D patent/BE425547A/xx unknown

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