Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
  • D01D10/04—Supporting filaments or the like during their treatment
  • D01D10/0418—Supporting filaments or the like during their treatment as cakes or similar coreless thread packages
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
  • D01D10/04—Supporting filaments or the like during their treatment
  • D01D10/0409—Supporting filaments or the like during their treatment on bobbins
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
  • D01F11/02—Chemical after-treatment of artificial filaments or the like during manufacture of cellulose, cellulose derivatives, or proteins

Definitions

• the viscose after a suitableripening period, is readyior spinning andis pumped through pipe lines to the spinning machineswhere it is extruded through minute openings of a spinneret into an acid bath where it is coagulated to form rayon thread.
• the freshly spun, wet thread containing considerable impurities in the form of acids, salts and sulfur compounds, which must be removed, is wound on a bobbin or collected in the form of a cake in a centrifugal spinning pot.
• the yarn was then desulphurized by treating with alkaline desulphurizing agents such as solutions of sodium and ammonium sulfide, sodium sulfite, dilute sodium'hydroxide and the like. It then became necessary to expel the desulphurizing agents and was effected by washing the thread package in warm and cold water baths containing, if necessary, dilute acids to facilitate the removal of the alkaline desulphurizing' agents. As a further treatment, the thread package was also bleached preferably after desulphurizing.
• alkaline desulphurizing agents such as solutions of sodium and ammonium sulfide, sodium sulfite, dilute sodium'hydroxide and the like. It then became necessary to expel the desulphurizing agents and was effected by washing the thread package in warm and cold water baths containing, if necessary, dilute acids to facilitate the removal of the alkaline desulphurizing' agents.
• the thread package was also bleached preferably after desulphurizing.
• My invention is designed to overcome the ob- V jectionable characteristics of such a procedure, and one of its objects is the provisionof an improved process for washing and de'sulphurizi'ng rayon.
• Another object of the invention is to effect a quick removal of carbon disulphide during washing and desulphurizing whereby substantial economy in operations is effected.
• a further object of the invention is to accelerate the desulphurizing step and accentuate the action of the desulphurizing agent whereby the entire treating time is considerably shortened.
• the carbon disulfide With the rise in temperature of the desiflphurizing fluid in the package as a result of the application of steam the carbon disulfide is quickly volatilized, and the alkaline desulphurizing solution, becoming heated as a result of the action of the steam, efiects a rapid and thorough removal of all of the sulphur impurities together with the carbon disulfide.
• the escaping carbon disulfide may be recovered, if desired, in any known manner.
• the yarn package is then Washed with hot and/or cold water 'to remove all of the residual impurities.
• a method of treating freshly spun rayon comprising washing freshly spun rayon in package form with water, treating the same with an alkaline desulfurizing agent, disseminating the desulphurizing agent throughout said package bymeans of steam and again washing with water.
• a method of treating freshly spun rayon comprising washing freshly spun rayon in package form with cold water until the greater portion of acids are removed, impregnating with an alkaline desulfurizing agent at room temperature, subjecting said impregnated package to the action of steam and finally removing the impurities by washing the package with water.
• a method of treating freshly spun rayon which has been coagulated in an acid bath comprising washing freshly spun rayon in package form with cold water to remove the greater portion of salts and acids, treating with an aqueous alkaline desulfurizing agent at room temperature, subjecting said package to the action of steam and washing in successive baths of hot and cold water.
• a method of treating freshly spun rayon which has been coagulated in an acid bath comprising washing freshly spun rayon in package form with cold water to remove the greater portion of salts and acids, treating with a solution containing 0.15% sodium hydroxide at room temperature, immediately subjecting said package to the action of low pressure steam at an absolute pressure of 0.3 atmosphere and washing in successive baths of hot and cold water.
• a process for the after treatment of freshly spun packages of artificial silk threads which comprises washing the packages substantially free of acid and salts with cold water, then impregnating the same with an alkaline desulphurizing solution at room temperature whereby the remaining acids are neutralized, treating the impregnated packages with steam to expel the carbon disulphide and accelerate the desulphuriz ing action, and finally washing the packages with water.
• a method of treating freshly spun viscose rayon which has been coagulated in an acid bath to form thread and the like and thereafter collected in package form which comprises washing the package of threads with cold water until the greater portion of acids and salts are removed therefrom, immediately treating the package with an alkaline desulphurizing agent to neutralize the remaining acids and dissolve the soluble sulphur compounds, heating and disseminating the desulphurizing agent throughout the package with steam to thereby accelerate the action thereof while volatilizing the carbon disulphide and effecting the simultaneous removal of the sulphur impurities together with the carbon disulphide and finally washing the package with water to remove the residual impurities.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7990174

Family Applications (1)

Country Status (4)

Cited By (3)

• 0
  • BE BE433428D patent/BE433428A/xx unknown
  • NL NL51025D patent/NL51025C/xx active
• 1939
  • 1939-03-17 FR FR851768D patent/FR851768A/fr not_active Expired
  • 1939-03-23 US US263808A patent/US2208965A/en not_active Expired - Lifetime

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