US2110649A - Continuous bleaching process - Google Patents

Continuous bleaching process Download PDF

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Publication number
US2110649A
US2110649A US712609A US71260934A US2110649A US 2110649 A US2110649 A US 2110649A US 712609 A US712609 A US 712609A US 71260934 A US71260934 A US 71260934A US 2110649 A US2110649 A US 2110649A
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United States
Prior art keywords
bleaching
bleached
bath
liquor
agent
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Expired - Lifetime
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US712609A
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English (en)
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Franz Ehrhart
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Individual
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Individual
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • 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
    • D06L4/12—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen combined with specific additives
    • 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
    • D06L4/15—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using organic agents

Definitions

  • Continuous addition of bleaching agents is particularly advantageous when it is desirable or necessary to work with extremely low concentrations of bleaching agents),
  • Thebleaching process is preferably carried out in the following manneri First, the necessary temperature '10.
  • the bleaching liquor will comparatively 30 often come into contact withthe walls of the bath, metal tubes, the circulating pump etc., and working conditions as a whole favor the rapid decomposition of the bleaching agent by catalytic and mechanical influences, it is preferable to use 35 the bleaching solutions in stabilized condition.
  • the customary stabilizers may be used with a few exceptions which will be dealt with below. It is a surprising fact that when stabilizers are used which are capable of lowering 40 I the pH-value of the solution the bleaching speed is not decreased, but in most instances even increased. The bleaching efiect, however, is affected by a side reaction which becomes apparent in the yellowing of the goods and which involves 45 a considerable loss of material.
  • Beside phosphoric and boric acids the organic acids, especially oxalic and lactic acids, can be used which delay the appearance of yellowing so much that bleaching effects are attained which are equal to those obtained with an alkaline liquor, with the difierence, however, that the consumption of bleaching agents and material amounts only to a fraction of that of the alkaline process.
  • the bleaching agent in an activated state, so that the material to be bleached carries substances capable of accelerating bleaching at the points desired.
  • substances include for instance metallic salts, enzymes and ferments as well as substances capable of imparting a high pH-value to an aqueous solution.
  • bleaching liquor and the material to be bleached are then moved towards one another through the bath, the activator and the stabilizer will compensate one another and themost strongly activated material, i. e., the material at the moment entering the bath, will meet the most weakly stabilized liquor where the latter just leaves the bath. If this liquor is to be used again for bleaching, bleaching agents as well as stabilizers must be added thereto.
  • the bleaching process described can be carried out in steps or combined with other bleaching processes, it being immaterial whether the process is carried out first or afterward or interposed.
  • the bleaching begun in the bath by storing the wet material at normal or slightly increased temperature.
  • the goods, having passed'the bath may be guided directly over heated rollers for simultaneously bleachin and drying them.
  • devices like continuous belt conveyors or movable forks or grippers passing'through the bath may be used. If the material to be bleached has already the form of bands or pieces, such as the top of wool, it is advisable to pass these bands through the bleaching liquor after .the usual working.
  • the required activator can be provided in the simplest way by allowing enzymes of the raw material to remain therein or by only incompletely removing substances like soap having an alkaline effect and being present from the pre-treatment prior to introducing the goods into the bleaching bath.
  • a continuous bleaching process which consists in treating organic material with acid stabilized aqueous solutions of bleaching agents containing up to 3% of H202, said material carrying at the points to be bleached substances capable of acceleratingbleaching and free from heavy metal, and in supplementing the bleaching agent during the process by adding the bleaching agent to the portion of the liquor which, during the addition, does not have to exert a bleaching influence upon the material to be bleached.
  • a continuous bleaching process which consists in treating organic material with acid stabilized aqueous solutions of bleaching agents containing up to 3% of H202, said material carrying at the points to be bleached substances capable of activating bleachingand consisting of compounds reacting alkaline in the presence of water, and in supplementing the bleaching agent during the process by adding the bleaching agent to the portion of the liquor which, during the addition, does not have to exert a bleaching influence upon the material to be bleached.
  • A' continuous'bleaching process which consists in treating organicmaterial with acid stabilized aqueous solutions of bleaching agents containing up to 3% of H202, said material carrying at the points to. be bleached enzymes as activators accelerating bleaching, and in supplementing the bleaching agent during the process by adding the bleaching agent to the portion of the liquor which, during the addition, does not have to exert a bleaching influence upon the material to be bleached.
  • a continuous bleaching process which consists in treating organic material with acid stabilized aqueous solutions of bleaching agents containing up to 3% of H202, oxalate-ionbeing added to stabilize the bleaching solution and for preventing yellowing, and in supplementing thebleaching agent during the process by adding the bleaching agent tothe portion of the liquor which, during the addition, does not have to exert a bleaching influence upon the material to be bleached.
  • a method of bleaching comprising coating the material to be bleached with an activator, circulating a peroxide bleach, through a vessel, and, moving the material to be bleached through the bleach in the vessel counter to the direction of flow of the bleach.
  • a method of bleaching a material to be bleached and containing alkali introduced thereinto by a preceding treatment comprising circulating an acid. stabilized peroxide bleach through avessel, and moving the material to be bleached through the bleach in the vessel counter to the direction of flow of the bleach.
  • a continuous process for bleaching a material carrying substances free from heavy metals for accelerating bleaching which comprises treat ing the material in a continuously circulating acid stabilized aqueous solution containing a bleaching agent or up to 3% H20: and continuously adding said bleaching agent to that portion of the solution which is circulated out of contact with said material to be bleached to maintain said bath at a predetermined concentration.
  • a continuous process for bleaching a material which comprises continuously circulating an acid stabilized aqueous solution containing a bleaching agent oi up to 3% H202, passing said material through said solution counter to the current of said solution, said material carrying substances for accelerating bleaching when it is passed through said solution, and maintaining said circulated solution at a predetermined concentration by adding said agent to a portion of said solution, which is out of contact with said material.
  • a continuous process for bleaching a material carrying a compound reacting alkaline in the presence of water to accelerate the bleaching which comprises treating the material in a continuously circulating acid stabilized aqueous solution containing a bleachng agent of up to 3% H202 and continuously adding said bleaching agent to that portion of the solution which is circulated out of contact with said material to be bleached to maintain said bath at a predetermined concentration.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detergent Compositions (AREA)
  • Treatment Of Fiber Materials (AREA)
US712609A 1934-02-01 1934-02-23 Continuous bleaching process Expired - Lifetime US2110649A (en)

Applications Claiming Priority (1)

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DE451115X 1934-02-01

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US2110649A true US2110649A (en) 1938-03-08

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BE (1) BE407492A (en))
FR (2) FR451115A (en))
GB (1) GB451115A (en))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426142A (en) * 1943-09-01 1947-08-19 Du Pont Bleaching cotton textile goods
US3026166A (en) * 1959-10-09 1962-03-20 Fmc Corp Peroxide-dipersulfate bleaching of cotton fibers
US3185649A (en) * 1960-07-28 1965-05-25 Lever Brothers Ltd Bleaching compositions
US3751222A (en) * 1971-12-13 1973-08-07 Colgate Palmolive Co A process of cleaning cloth
CN102817227A (zh) * 2012-08-14 2012-12-12 安徽舒城县翰文运动用品有限责任公司 羽毛脱色处理工艺

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755185C (de) * 1937-08-06 1952-11-17 Degussa Verfahren zum Bleichen von Textilgut aus regenerierter Cellulose
DE903812C (de) * 1940-09-21 1954-02-11 Degussa Verfahren zum Bleichen von Textilgut aus kuenstlichen Fasern
US2701178A (en) * 1951-05-24 1955-02-01 Stevenson Dyers Ltd Permonosulfuric acid treatment of wool, for shrink resistance
BE516714A (en)) * 1952-01-04
US2720441A (en) * 1953-09-21 1955-10-11 Du Pont Peroxygen bleaching of nylon
US2882121A (en) * 1954-12-07 1959-04-14 Stevensons Dyers Ltd Permonosulfuric acid for bleaching synthetic polymer textiles
NL254297A (en)) * 1959-07-28

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426142A (en) * 1943-09-01 1947-08-19 Du Pont Bleaching cotton textile goods
US3026166A (en) * 1959-10-09 1962-03-20 Fmc Corp Peroxide-dipersulfate bleaching of cotton fibers
US3185649A (en) * 1960-07-28 1965-05-25 Lever Brothers Ltd Bleaching compositions
US3751222A (en) * 1971-12-13 1973-08-07 Colgate Palmolive Co A process of cleaning cloth
CN102817227A (zh) * 2012-08-14 2012-12-12 安徽舒城县翰文运动用品有限责任公司 羽毛脱色处理工艺

Also Published As

Publication number Publication date
GB451115A (en) 1936-07-29
FR451115A (fr) 1913-04-11
FR798566A (fr) 1936-05-20
BE407492A (en))

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