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 an improved process for bleachingfibers, especially, cellulosic fibers, either as such or in the form of yarns, woven fabrics or knit goods, in which the goods to be bleached are impregnated with an aqueous bleaching solution, the excess bleaching solution is removed by squeezing or centrifug" ing and the goods are then subjected to a heat treatment followed by washing which simplifies and reduces the time required for the bleaching.
• the object of the present invention is to provide a process in which the time the bleaching agent acts on the goods could be shortened substantially while at the same time attaining a higher degree of whiteness.
• the results of a bleaching treatment with regard to the degree of whiteness, as well as wettability could be substantially improved while effecting a saving in steam Patented Aug. 13, 1968 and heat energy if, according to the invention, the goods to be bleached are impregnated with the aqueous bleaching solution, such impregnated goods are stored at room or moderately raised temperatures, for instance up to about 40 C. for several hours, for example, 3 to 10 hours, in a tightly packed state, and after such storage are treated in a pressure steamer at temperatures between and 200 C. for 15 to 120 seconds.
• a pressure steaming treatment is effected at temperatures between and 150 C. at corresponding pressures for 30 to 60 seconds.
• Peroxidic textile bleaching solutions such as, for example, those of hydrogen peroxide, sodium peroxide or sodium perborate, are especially suited for the process according to the invention.
• the process for instance,
• the textile goods to be bleached can be carried out by impregnating the textile goods to be bleached with, for example, an alkaline hydrogen peroxide containing bleaching solution, removing the excess solution to provideabout a 100% to 150% take up by the goods. Thereupon the goods are folded up or rolled up and left to be acted on by the bleaching solution contained therein for several hours at room temperature. Thereafter, the goods are introduced into a pressure steamer without repeating the impregnation or an intervening Wash and treated in such pressure steamer at the temperatures indicated for a short time and then given the usual rinse.
• an alkaline hydrogen peroxide containing bleaching solution removing the excess solution to provideabout a 100% to 150% take up by the goods.
• the goods are folded up or rolled up and left to be acted on by the bleaching solution contained therein for several hours at room temperature. Thereafter, the goods are introduced into a pressure steamer without repeating the impregnation or an intervening Wash and treated in such pressure steamer at the temperatures indicated
• the total time required for the treatment of the goods to be bleached can be shortened substantially while at the same time a higher degree of whiteness and a better removal of seed shells in theicase of cotton fabrics can be attained. Furthermore, the wettability of the goods bleached according to the invention is considerably improved.
• the nettle cloth was impregnated with an aqueous bleaching solution which per liter contained Water glass 38/40 B. "ml-.. 30 NaOH g 10 H 0 (35% by weight) ml 40 Lamepon A (condensation product of oleic acid chloride and sodium lysalbinate) g 2 Wetting agent (lauryl sulfate) g 2
• Wetting agent laauryl sulfate
• the steam was at a temperature of 130 C. which corresponds to a gauge pressure between 2.8 to 3.2.
• the cloth samples were each rinsed successively with hot, warm and cold tap water.
• the degree of whiteness, the time required for submerging when placed on water and the degree of seed shell removal was determined for each bleached sample. The results are given in the following table:
• tests 2 and 3 which were according to the invention, resulted in goods which were seed shell free, and had good wettability and a higher degree of whiteness than were obtained in tests 1, 2a and 3a.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=7048088

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (5)

• 1964
  • 1964-04-09 DE DED44106A patent/DE1301996B/de active Pending
• 1965
  • 1965-04-05 US US445696A patent/US3397033A/en not_active Expired - Lifetime

Patent Citations (5)

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