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
  • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
  • D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
  • D06L1/14—De-sizing
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
  • D06M11/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with hydrogen peroxide or peroxides of metals; with persulfuric, permanganic, pernitric, percarbonic acids or their salts

Definitions

• This invention relates to the desizing of sized textiles of all kinds, particularly to the removing of starchy material from sized textiles, and to products suited for this purpose.
• the fibres of sized textiles require a cleansing pre-treatment before being subjected to further processes such as. bleaching, dyeing, printing, and the like, since in addition to natural fats and waxes they also contain, as a result of the spinning process, oily or greasy contaminating matter, and especially sizing agents,
• An object of the invention is to remove the size of textiles in a simple and eflicient manner.
• Another object of the invention is to prepare the sized materials for further improving processes, e. g. .for bleaching and dyeing in a relatively short space of time.
• a further object is to impart to the textiles treated a high absorbing power ensuring in subsequent bleaching and/or dyeing processes a uniform action of the baths used and avoiding the occurrence of spots and irregularities in a better way than hitherto possible.
• the present invention is based on the recognition that the salts of persulphuric acid (HzSzOa) have an entirely specific and particularly intensive effect in removing the size of textiles, which is far superior to that of other oxygen-yielding compounds.
• the method according to the invention consists in contacting the sized textile with a watery solution of salts of persulphuric acid. In general a relatively small amount of persulphate is used. According to my experience in'this field of the art a concentration of 0.2 gramme to 2 grammes of the said salts per litre of the solution is sufficient to obtain regularly the desired effect.
• persulphates be always present in the solution for removing the size, since the action of persulphate 10 is of decisive importance for the complete and rapid removal of the size from the fibres, while the addition of other per-compounds has the effect, mainly, of bringing about favorable secondary results.
• Such additions have the efl'ect, more particularly, of preventing any discoloration that might otherwise occur, and also at the same time allow of a particularly good pre-bleaching of the fibres to be eflected.
• the method according to the invention is in principle applicable to all vegetable, animal, and artificial textile materials.
• this method may be employed not only for the treatment oi cotton and other cellulose fibres, such as linen, hemp, ramie, and jute, but also for the cleansing and desizing of animal fibres, such as wool and silk.
• the method is likewise applicable for the cleansing and removal of 30 size from every kind of artificial fibres, particularly rayon and mixed materials.
• the method according to the invention aflords the possibility of adjusting the bath so as to be alkaline, neutral, or acid, as may be desirable forzany particular fibre, and also of combining the removal of the size with other, conventional, treatments which must be carried out in a bath having a definite concentration 01 H and OH-ions, respectively.
• a point of particular significance is that when carrying out the removal of size by the method according to the invention boiling (bucking) baths employed subsequently thereto remain far cleaner than with the method oi working hitherto adopted, since, apart from the size, a large part of the other impurities is also removed before bucking.
• the removal of size with caustic alkaline baths is also applicable, with advantage, to the treatment of colored, striped or bordered materials provided in addition to persulphate there be added to the bath slight quantities of H20: or its derivatives, in which case not even the treatment of naphthol dyed material is impossible.
• the additional bleaching effect achieved by the described pre-treatment may even go so far that a single subsequent oxygen bath of a known type suffices to complete the bleaching.
• either suitably small quantities of caustic alkali may be added to the bath, or, better still, the bath may be rendered alkaline with the aid of compounds causing an alkaline reaction other than caustic alkalies.
• examples of such compounds are preferably carbonates, secondary and tertiary phosphates, pyrophosphates, metaphosphates, borates, and the like. These salts causing a weakly alkaline reaction may also be employed as additions to baths containing suitably slight quantities of caustic alkali.
• baths which assume acid reaction in the cours of the treatment, whether the baths are employed without the additional introduction of compounds causing an alkaline reaction, or whether the added quantity of alkali is so limited that the alkali does not suflice to completely neutralise the sulphuric acid formed. It is thus possible to carry out the cleansing and removal of size even in acid baths.
• Such baths may also be brought to the desired degree of acidity by the direct addition of compounds causing an acid reaction which are added before commencement of the treatment or during the treatment.
• the removal of size in accordance with the present invention can also be combined with other, conventional, treatments.
• the removal oi size may be combined with a bleaching.
• various pre-treatment baths such as for example in the treatment of colored, striped or bordered materials with the boiling or scalding bath.
• Persulphate may be added to a bath of this nature, with the result that the boiling or scalding and removing of size are comprised in one process step, and the dyes at the same time protected from becoming vatted.
• the removal of size may be carried out in any impregnating or washing machine. Since the described baths are non-sensitive to a great extent to catalysts the rollers of the apparatus employed may even consist of iron or copper.
• the treatment may also be carried out by steeping the goods in vats or circulation apparatus, kettles, jigs, in a machine for impregnating material in unfolded condition (open width), on the reel or on the clapot, or the like, the goods being allowed to rest either under the bath or after squeezing out. This mode of treatment is adopted more particularly in the case of yarns, tricot, and other kinds of goods which are not as a rule passed through impregnating machines.
• the temperature of the .bath is about 80 to 90 C.
• the liquid absorption of the goods coming from singeing amounts to some dered materials made from American cotton are impregnated on a clapot with a bath containing, for every 1000 litres of bath, 7 litres of caustic soda solution'of 40 B., 1 kg. of potassium persulphate, and kg. of hydrogen peroxide of 30% strength.
• the bath has a temperature of C.
• the material is allowed to rest over night in a wooden tub, the surplus used bath being used to cover the material. After this treatment the material is run over a washing machine into a circulation apparatus and there bleached to its final condition in a known manner with an oxygen bath.
• sized textile to mean textile yarns and textile fabrics carrying sizing agents consisting of or containing polymeric carbohydrates selected from the group consisting of dextrin, vegetable gum, and vegetable mucilage, and particularly starch.
• starch as its largest component, at an elevated temperature, with a watery solution containing per litre 0.2 gram to 2 grams of a salt 01' persulphuric acid and in addition thereto another compound selected from the group consisting of hydrogen peroxide and percompounds yielding, on decomposition in aqueous solutions, hydrogen peroxide as an intermediate product.
• said alkaline solution containing in addition to the said salt of persulphuric acid, another compound selected from the group consisting of hydrogen peroxide and percompounds yielding, on decomposition in aqueous solutions, hydrogen peroxide as an intermediate product.
• a process or desizing textiles comprising the step of treating a textile carrying a sizing of a starchy material while at above room temperature, with a watery solution ot a salt of persulphuric acid, the said solution containing an amount or a compound having basic properties, which is only about suillcient to neutralize sulphuric acid formed by decomposition of the persulphate during the treatment.
• a process 01' desizing textiles the step of treating textile material sized with a material which includes a polymeric carbohydrate of the type n(CsH1oO6) -as' a major component, while at an elevated temperature, with a watery solution of a salt of persulphuric acid, and adding to said solution a compound having basic properties in such a limited amount that the bath assumes an acid reaction during the treatment as a consequence of decomposition oi. the persulphate taking place during said treatment.
• a process 01' desizing textiles the step of treating starch-sized textiles at an elevated temperature with a watery solution 01a salt of persulphuric acid, the said solution also containing other acid material in addition to the acid material produced from said salt of persulphuric acid.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=32070378

Family Applications (1)

Country Status (6)

Cited By (10)

Families Citing this family (4)

• 1936
  • 1936-03-23 AT AT151637D patent/AT151637B/de active
  • 1936-06-19 DE DE1936B0174536 patent/DE695120C/de not_active Expired
  • 1936-06-23 DE DE1936B0174602 patent/DE700979C/de not_active Expired
  • 1936-10-13 GB GB27789/36A patent/GB479965A/en not_active Expired
• 1937
  • 1937-01-04 NL NL80705A patent/NL48545C/xx active
  • 1937-02-24 US US127569A patent/US2173040A/en not_active Expired - Lifetime
  • 1937-03-17 FR FR819322D patent/FR819322A/fr not_active Expired

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