US2297613A - Process of producing viscose rayon - Google Patents

Process of producing viscose rayon Download PDF

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Publication number
US2297613A
US2297613A US302362A US30236239A US2297613A US 2297613 A US2297613 A US 2297613A US 302362 A US302362 A US 302362A US 30236239 A US30236239 A US 30236239A US 2297613 A US2297613 A US 2297613A
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US
United States
Prior art keywords
bath
per cent
threads
zinc
thread
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Expired - Lifetime
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US302362A
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English (en)
Inventor
Fink Heinrich
Plepp Gaston
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WALTHER H DUISBERG
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WALTHER H DUISBERG
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Classifications

    • 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
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose

Definitions

  • This invention relates to the production of viscose rayon of especially high tensile strength. It has been proposed to produce threads of high tensile strength in the normal spinning baths, for instance in the so-called Miiller baths, which may contain zinc sulfate or other bivalent'metal salts, by strongly stretching the freshly spun threads in hot neutral or acid baths.
  • the coagulation leads to cellulose xanthate' threads which are subsequently stretched by 25 and more, for instance 100 percent, in a second bath which contains an alkaline swelling agent.
  • the normal Miiller bath which may contain sulfuric acid and salts, leading the freshly spun threads into alkaline solutions containing zinc or aluminum, for instance solutions of zinc hydroxide in ammonia or of aluminum hydroxide in caustic soda lye and subjecting the threads thus treated to strong stretching.
  • the alkaline treating baths containing zinc may be produced by adding to a solution of zinc sulfate in water enough ammonia to redissolve the zinc hydroxide which precipitates at first.
  • the zinc hydroxide precipitated from a solution of a zinc salt may also be separated from the solution and dissolved in dilute ammonia.
  • alkaline solutions of aluminum hydroxide may be produced from aluminum salt solutions by means of caustic alkalies.
  • the acid concentration of the spinning baths may be kept under or above 7 per cent sulfuric acid.
  • the adhering acid is removed as well as possible.
  • a short intermediate treatment with a washing bath for instance a sodium sulfate solution may be interposed between the spinning bath and the zinc bath.
  • the swelling action of the zinc or aluminum bath enables the thread to be easily stretched to 50 and even 100 per cent and more in excess of the original length of the thread coagulated in the acid precipitating bath.
  • the stretching can be efiectedin the alkaline zinc or aluminum bath itself or after leaving this bath during the passage of the thread through air, or in a third bath consisting of hot water.
  • steam may be apthreads the stretched threads are collected on suitable receiving devices for instance reels or spools or spinning pots and simultaneously treated with dilute acids to finally fix them.
  • the final acidification may also be applied to the running thread which latter measure is especially useful in producing staple fibers.
  • the tensile strength in the dry state of more than 3 or 3.5 g. per denier and in the wet state of more than 2.2 and even 3 g. per denier combined with an extensibility of 15 to 20 per cent can be easily obtained.
  • Example 1 A viscose produced from alkali cellulose ripened hours at 20 C. which viscose has a content of 8 per cent cellulose and 7.5 per cent alkali and has a spinning ripeness of 8.3 common salt number and a viscosity of 27.5 poises is spun at 40 C. into a bath containing 30 per cent M1280; and
  • Example 2 Alk'ali cellulose produced from a high grade sulflte pulp and ripened at 20 C. for 20 hours is dissolved to yield a viscose containing 6.5 per plied of about 100 c. In producing endless 00 cent ce lulose and 8.5 per cent alkali. he iscose which has a common salt number of '7 to 8 and a viscosity of 191 poises is spun as in Example 1 in a Miilier bath.
  • the thread After leaving the precipitating bath the thread is led by means of rolls through an alkaline-aliuninum bath containin 2 per cent aluminum and 6 per cent sodium hydroxide (produced from aluminum sulfate solution and caustic soda lye). The thread is subsequently stretched as strongly as possible in a steam atmosphere at 100 C. and is led onto a reel on which it is acidified with sulfuric acid of 3 per cent strength.
  • denier Alkali cellulose produced from a high grade beechwood-pulp is ripened at 20 C. for 20 hours and a viscose is prepared therefrom containing 8 per cent cellulose and 7.5 per cent alkali.
  • the viscose is spun at 45 in a bath containing 10 per cent sulfuric acid, '7 per cent zinc sulfate and 18 per cent sodium sulfate, and the thread is sub-- sequently led through an alkaline zinc bath which was obtained by adding ammonia to a zinc sulfate solution and which contains 6 per cent zinc and 20 per cent ammonia.
  • the thread is subsequently stretched in a steam atmosphere at 100 C.
  • a process of producing viscose rayon of high tensile strength which comprises spinning threads in a bath containing suliuric acid and an alkali metal sulfate, leading the threads thus formed through an alkaline bath containing in solution a metal hydroxide selected from the group consisting of zinc and aluminum hydroxides, said bath having a swelling action on said threads and stretching said threads to exceed the original length of the threads leaving the spinning bath by at least 25 per cent.
  • a process of producing viscose rayon of high tensile strength which comprises spinning threads in a bath. containing sulfuric acid and' formed through an alkaline bath containing zinc hydroxide in solution, said bath having a swelling action on said threads and stretching the swollen threads in hot water to exceed their original length by at least 25%.
  • a process of producing viscose rayon of high tensile strength which comprises spinning threads in a bath containing sulfuric acid and an alkali metal sulfate leading the threads thus formed through an alkaline bath containing zinc hydroxide in solution, said bath having a swelling action on said threads, and stretching the swollen threads in hot steam to exceed their original length by at least 25%.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
US302362A 1938-11-09 1939-11-01 Process of producing viscose rayon Expired - Lifetime US2297613A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI62846D DE749264C (de) 1938-11-09 1938-11-09 Verfahren zur Herstellung von Kunstfasern oder -faeden aus Viskose

Publications (1)

Publication Number Publication Date
US2297613A true US2297613A (en) 1942-09-29

Family

ID=5898336

Family Applications (1)

Application Number Title Priority Date Filing Date
US302362A Expired - Lifetime US2297613A (en) 1938-11-09 1939-11-01 Process of producing viscose rayon

Country Status (5)

Country Link
US (1) US2297613A (enEXAMPLES)
CH (1) CH235738A (enEXAMPLES)
DE (1) DE749264C (enEXAMPLES)
FR (1) FR869593A (enEXAMPLES)
NL (1) NL53297C (enEXAMPLES)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491938A (en) * 1944-10-18 1949-12-20 Rayonier Inc Method of producing viscose filaments
US2515834A (en) * 1942-11-13 1950-07-18 Du Pont Cellulose filaments and method of producing same
US2536094A (en) * 1949-09-17 1951-01-02 American Viscose Corp Process for spinning artificial fibers
US3038778A (en) * 1957-06-21 1962-06-12 American Enka Corp Manufacture of viscose rayon

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965150C (de) * 1940-01-06 1957-06-06 Phrix Werke Ag Verfahren zur Herstellung fester Kunstfasern und -faeden aus Viscose
DE1258013B (de) * 1960-10-28 1968-01-04 Anton Marek Verfahren zum Herstellen von Regeneratcellulosefaeden und -fasern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB253853A (en) * 1925-06-17 1926-07-22 Leon Lilienfeld Process for improving artificial fibrous materials
NL21473C (enEXAMPLES) * 1925-06-20
US1996989A (en) * 1928-08-09 1935-04-09 Waldhof Zellstoff Fab Production of artificial filaments

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515834A (en) * 1942-11-13 1950-07-18 Du Pont Cellulose filaments and method of producing same
US2491938A (en) * 1944-10-18 1949-12-20 Rayonier Inc Method of producing viscose filaments
US2536094A (en) * 1949-09-17 1951-01-02 American Viscose Corp Process for spinning artificial fibers
US3038778A (en) * 1957-06-21 1962-06-12 American Enka Corp Manufacture of viscose rayon

Also Published As

Publication number Publication date
CH235738A (de) 1944-12-31
NL53297C (enEXAMPLES) 1942-10-15
FR869593A (fr) 1942-02-05
DE749264C (de) 1944-11-21

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