US2845416A - Method of aging a viscose solution - Google Patents

Method of aging a viscose solution Download PDF

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Publication number
US2845416A
US2845416A US378445A US37844553A US2845416A US 2845416 A US2845416 A US 2845416A US 378445 A US378445 A US 378445A US 37844553 A US37844553 A US 37844553A US 2845416 A US2845416 A US 2845416A
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Prior art keywords
viscose
solution
tanks
aging
spinning
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Expired - Lifetime
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US378445A
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English (en)
Inventor
Elling Hugo
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Akzona Inc
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American Enka Corp
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    • 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

  • the present invention relates to a method for making viscose and more particularly to a method for aging viscose. 7
  • viscose is transported by means of pumps into storage tanks in which it remains for several hours for aging. It is known to pump viscose consecutively into several tanks in which the solution is deaerated, for instance in a vacuum. For obtaining a good spinning effect it is of importance that the viscose be made homogenous in a mixing vessel before the spinmng.
  • the known processes for treating the spinning solution have the disadvantage that due to the high viscosity thereof, portions of the viscose adhere to the walls of the containers, react with the air, and are partly solidified.
  • Amounts of viscose which have reacted with the air have a gel-like consistency and pass therefore through all filters and through the spinneret producing weak spots in the extruded filament which cause breakage during the further steps of the manufacture of rayon.
  • portions of the viscose known as heels, have to be retained in the tanks in order to prevent entering of air into the conduits. Consequently, when the tanks are filled with the next charge of viscose, the remaining portions of a previous charge'are not only more aged than the new charge, but also contain foam, particularly in the deaeration tanks, such foam also causing disturbances during spinning.
  • the present invention mainly consists in a method for aging viscose and comprises the steps of completely filling closed container means with viscose; and retaining said viscose in said container in the absence of an oxidizing gaseous medium until the viscose is aged to the right degree for spinning.
  • cellulose xanthate is first at least partly dissolved, and then pumped through a series of containers which are completely filled by the solution.
  • agitating means are provided which stir the viscose. All tanks and all conduits connecting the same are completely filled with the viscose which does not come into contact R 2,845,416 Patented July 29, 1958 2 with the air. while the xanthate is completely dissolved and the viscose aged to the right degree for spinning.
  • the viscose is moved in a constant flow during the aging and until reaching the spinneret of the spinning machine.
  • the supply pumps which press the viscose to the spinneret are supplied with more viscose than is required for the predetermined denier of the produced filament.
  • a return conduit connects the suction side of the supply pump with the last container and since the supply pump can only move a predetermined amount, the surplus of viscose which cannot be absorbed by the supply pump is returned to the last container.
  • the viscose flowing through the aging tanks to the spinning machine is preferably kept by suitable cooling or heating devices H, H at a temperature between 0 degrees centigrade and 45 degrees centigrade, and is allowed to age a time period of 1 to hours. If required, oils and titanium dioxide suspensions are added by suitable mixing means to the viscose while the same is in the aging tanks.
  • the xanthate is at least partially dissolved in the containers 10.
  • the pump 11 forces several charges of the solution from containers 10 into the blendingtank 12, in which the solution is mixed by suitable mixing means such as blades 13.
  • the mixture is continuously deaerated in the vessel 14 by boiling and then is pumped by pump 15 into a conduit system including a first series of storage or aging tanks 16 which are completely filled by the viscose so that all air is expelled therefrom. Additional pumps'17 are pro vided for assuring a continuous flow of the viscose from these tanks.
  • the pumps 11, 15 and 17 are provided with by-pass conduits and valves 18 in order to maintain the respective pressures thereof at a constant level, as is known in the art.
  • the viscose next passes through a 'first filter 19 and is forced by pump 20' into a second series of aging tanks 21.
  • the pump 31 pumps the spinning solution, which has now aged. to the right degree of viscosity for spinning, from the tanks 30 to filter press 32 and to the spinning machine represented by spinnerets 33.
  • the tanks 16, 21, 26 and 30 are provided with agitating and stirring means 34, 35, 36 and 37, respectively. All tanks and conduits are free of air and completely filled by the flowing viscose so that any contact of the solution with an oxidizing medium is prevented.
  • the number of containers of course depends on the time required for aging a particular viscose solution to the right degree of ripeness for spinning.
  • the first filtration may be carried out immediately after the xanthate has been dissolved, or after the solution has been blended in tank 12. Also, more than one blending tank 12 may be provided for receiving unsuitable batches of viscose. More than one boiling deaeration vessel 14 also may be provided, if found to be necessary or desirable.
  • the supply conduit 38 of the spinning machine communicates with the return conduits 39, 40.
  • the spinning solution is moved through the conduits of the spinning machine at a speed greater than that of extrusion and is returned to the last tank 30 by means of pump 41 through a pipe 42, in which tank 30 the returned spanning solution is thoroughly mixed with the viscose already present therein.
  • Further closed tanks may be arranged parallel to the tanks 16, 21, 26 and 30 to receive a surplus of viscose solution in the event that the flow of the manufacturing operation is interrupted.
  • the agitating means 34, 35, 36 and 37 preferably are provided at the outermost ends thereof with blades which extend along the inner surface of the tanks and which are closely spaced therefrom so as to remove the viscose from the surface and to prevent a coagulation and adhering of the viscose to the wall.
  • Preferably manometers are provided on the aging tanks so that it is possible to determine whether the required pressure is present, which pressure is maintained by adjusting the output of each pump with respect to the other pumps.
  • the method of aging a viscose spinning solution while feeding the same to a spinning machine ina deaerated condition through a closed system comprising the steps of maintaining a supply of at least partially tanks and filters, passing the solution alternately through said storage tanks and filters for a sufiicient length of time to insure complete dissolution of the cellulose xanthate and aging of the viscose to the required degree for spinning and pumping the viscose from the storage tanks and filters through still another continuously filled conduit system to a spinning machine.
  • the method of aging a viscose spinning solution while continuously feeding the same to a spinning machine in a deaerated condition through a closed system comprising the steps of maintaining a supply of at least partially dissolved cellulose xanthate in a plurality of dissolving tanks, continuously pumping the solution from the dissolving tanks through a continuously filled conduit system including a blending tank to a deaeration vessel, continuously deaerating the solution, continuously removing the solution from the deaeration vessel and pumping the same through another continuously filled conduit system to a series of completely filled aging tanks, continuously passing the solution through the series of filled aging tanks for a sufficient length of time to insure complete dissolution of the cellulose xanthate and aging of the viscose to the required degree for spinning, continuously filtering the viscose and continuously pumping the viscose from the filtering means through still another continuously filled conduit system to a spinning machine.
  • the method of aging a viscose spinning solution while continuously feeding the same to a spinning machine in a deaerated condition through a closed system comprising the steps of maintaining a supply of at least partially dissolved cellulose xanthate in a plurality of dissolving tanks, continuously blending the solution in a completely filled tank while preventing contact of the same with an oxidizing medium, continuously pumping the solution from the blending tank through a continuously filled conduit system to a deaeration vessel, continuously deaerating the solution, continuously removing the solution from the deaeration vessel and pumping the same to a first series of completely filled aging tanks and filters, continuously passing the solution alternately through said first series of aging tanks and filters, continuously pumping the solution from the first series of tanks and filters to a second deaeration vessel, again continuously deaerating the solution, continuously removing the solution from the second deaeration vessel and pumping the same to a second series of aging tanks and filters, continuously passing the solution alternately through said second series of tanks and filters for

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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)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US378445A 1952-09-06 1953-09-04 Method of aging a viscose solution Expired - Lifetime US2845416A (en)

Applications Claiming Priority (1)

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DE741519X 1952-09-06

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US2845416A true US2845416A (en) 1958-07-29

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US378445A Expired - Lifetime US2845416A (en) 1952-09-06 1953-09-04 Method of aging a viscose solution

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US (1) US2845416A (enrdf_load_stackoverflow)
BE (1) BE522594A (enrdf_load_stackoverflow)
GB (1) GB741519A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985647A (en) * 1959-01-12 1961-05-23 Kohorn Oscar Von Manufacture of viscose spinning solution

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110129898B (zh) * 2019-06-10 2021-12-28 宜宾海丝特纤维有限责任公司 一种超粗旦粘胶长丝熟成工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357947A (en) * 1917-08-13 1920-11-09 Borzykowski Benno Apparatus for the production of masses or solutions free from air and other gases
US1357946A (en) * 1917-08-13 1920-11-09 Borzykowski Benno Method for the production of masses or solutions free from air or other gases
US1877337A (en) * 1929-03-27 1932-09-13 Ig Farbenindustrie Ag Apparatus for preparing highly uniform solutions for the manufacture of artificial products
US1895192A (en) * 1928-03-12 1933-01-24 Ig Farbenindustrie Ag Spinning cellulose solution
US2087016A (en) * 1934-07-13 1937-07-13 Du Pont Viscose process and apparatus
US2391973A (en) * 1942-03-30 1946-01-01 Du Pont Apparatus for the production of artificial filaments
US2509267A (en) * 1946-06-13 1950-05-30 American Viscose Corp Process for deaerating liquids

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357947A (en) * 1917-08-13 1920-11-09 Borzykowski Benno Apparatus for the production of masses or solutions free from air and other gases
US1357946A (en) * 1917-08-13 1920-11-09 Borzykowski Benno Method for the production of masses or solutions free from air or other gases
US1895192A (en) * 1928-03-12 1933-01-24 Ig Farbenindustrie Ag Spinning cellulose solution
US1877337A (en) * 1929-03-27 1932-09-13 Ig Farbenindustrie Ag Apparatus for preparing highly uniform solutions for the manufacture of artificial products
US2087016A (en) * 1934-07-13 1937-07-13 Du Pont Viscose process and apparatus
US2391973A (en) * 1942-03-30 1946-01-01 Du Pont Apparatus for the production of artificial filaments
US2509267A (en) * 1946-06-13 1950-05-30 American Viscose Corp Process for deaerating liquids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985647A (en) * 1959-01-12 1961-05-23 Kohorn Oscar Von Manufacture of viscose spinning solution

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GB741519A (en) 1955-12-07
BE522594A (enrdf_load_stackoverflow)

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