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
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/06—Wet spinning methods
• • 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
  • D01D1/00—Treatment of filament-forming or like material
  • D01D1/06—Feeding liquid to the spinning head
• • 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 object of the invention relates to a method and an apparatus for producing viscose filaments.
• viscose filaments are, for example, by W. Hartig; "Modern Production Methods For Viscose Filament Yarn", Chemical Fibers International Vol. 45, February 1995, pp. 35 ff.
• a viscose filament or viscose thread is created by bringing liquid viscose into contact with a spinning bath liquid, as a result of which the viscose coagulates.
• the spinning bath liquid can be, for example, a sulfuric acid bath.
• Salts which are, for example, sodium sulphate, zinc sulphate or magnesium sulphate, can be added to the sulfuric acid bath. The addition of such salts has the task of timing the regeneration of the cellulose in the coagulated viscose.
• the composition of the spinning bath liquid has an influence on the quality of the viscose filaments. It is also known that the temperature of the spin bath liquid also plays a role in the manufacture of viscose filaments.
• Tube spinning has been developed to achieve higher spinning speeds and to spin finer individual filaments.
• the spinneret opens into a tube that is continuously flowed through by a spinning bath liquid. Hydraulic distortion resistance can be influenced by the quantity of spinning bath liquid in the tube. Tube spinning also has the advantage that the quality of the spinning bath liquid and the amount of the spinning bath liquid can be maintained in a defined manner.
• Different designs of the devices for producing viscose filaments are known for producing viscose filaments. Such devices for producing viscose filaments are described in the article by W. Hartig.
• the present invention has for its object to provide a method and an apparatus for producing viscose filaments, in particular according to the tube spinning process, by means of which the properties of the viscose filaments are improved.
• this object is achieved by a method for producing viscose filaments, in particular by the tube spinning process, with the features of claim 1 or by an apparatus for producing viscose filaments with the features of claim 10.
• the process according to the invention for producing viscose filaments by wet spinning using a spinning tube, liquid viscose being brought into contact with a spinning bath liquid to form a filament is distinguished by the fact that the liquid viscose is heated before it enters the spinning bath liquid.
• the coagulation process is influenced by this procedure. During the coagulation process, a solidified coat forms in the viscose filament. Inside, the viscose filament is still liquid. The formation of the jacket influences the diffusion exchange that takes place in order to start the cellulose decomposition process in the interior of the filament. Therefore, the temperature of the viscose can influence the coagulation in such a way that, depending on the desired thread, the corresponding physical Set properties. The heating of the viscose also increases the spinning safety at high thread take-off speeds.
• the viscose temperature is above the temperature of the spinning bath liquid and thus a slowed down coagulation process occurs.
• the filament is drawn more slowly, as a result of which an improved alignment of the molecular structure and thus improved physical properties of the viscose filament are achieved. Very fine thread cross sections can be created with this.
• the liquid viscose is preferably heated by heating at least a section of the feed line, preferably the section of the feed line adjacent to the spinneret, and / or the spinneret. This measure ensures that the viscose does not over-ripen before entering the spin bath liquid. When the viscose is over-ripened, the cellulose no longer remains in solution, but solidifies. The curdled or gelatinized cellulose can then clog the spinneret.
• the liquid viscose is introduced into the spinning bath liquid through a feed line with a spinneret
• at least a section of the feed line preferably the section of the feed line adjacent to the spinneret, and / or the spinneret is heated.
• a heating medium flows through a chamber surrounding the feed line and / or the spinneret.
• the liquid viscose can be heated by leading the heating medium in cocurrent or countercurrent to the flowing liquid viscose. Whether the heating medium is conducted in cocurrent or countercurrent to the flowing liquid viscose depends, among other things, on the design of a device for producing viscose filaments.
• a device for producing viscose filaments by tubular spinning with a feed line and with a spinneret through which liquid viscose can be brought into contact with a spinning bath liquid to form a filament.
• This is characterized by at least one heating device by means of which the liquid viscose can be brought to a technologically favorable spinning temperature when it enters the spinning bath liquid.
• the feed line and / or the spinneret has a heating device.
• the heating device is formed in that it has a preferably annular chamber surrounding the feed line and / or the spinneret with an inlet and an outlet opening.
• a hot medium is introduced via the inlet opening into the chamber, which leaves the heating medium through the outlet opening.
• the heating medium can be steam, for example.
• the heating device comprise at least one electrical resistance heater.
• Such a heating device has the advantage that the liquid viscose can be kept at an almost constant temperature.
• the section of the feed line adjacent to the spinneret forms a mixing chamber, and that at least a partial area of the mixing chamber, preferably the inlet area, is heatable.
• Figure 1 A first embodiment of a system for producing viscose filaments by the tube spinning process
• Figure 2 schematically shows another embodiment of a spinning device for producing viscose filaments.
• 1 shows a first exemplary embodiment of a system for producing viscose filaments. The production of viscose filaments takes place according to the tube spinning process which is known per se.
• Liquid viscose is fed from a storage container 1 via a feed line 2 to a spinning head 3 with spinnerets (not shown).
• the liquid viscose enters the spinning tube 4 from the spinning head 3.
• a spinning bath liquid also called a coagulation liquid, is fed to the spinning tube 4.
• This spinning bath liquid is supplied by a pump 9 which is arranged in a line 8.
• the line 8 connects a collecting container 6 to the spinning head 3.
• the spinning bath liquid emerging from the spinning tube 4 is collected in a collecting container 5 and fed back to the collecting container 6 via a line 7.
• the viscose filament bundle 10 emerging from the spinning tube 4 is passed over coagulation godets 11 in order to continue the cellulose decomposition process in the thread.
• the coagulation godets are wetted with the spinning bath liquid.
• the filament bundle 10 is washed on the washing godet 12 and then dried on the heated drying godet 13.
• the dry thread 10 is withdrawn from the drying godet 13 and wound up into a bobbin 14.
• the feed line 2 has a heating device 15, through which the liquid viscose is heated before it enters the spinning bath liquid.
• the liquid viscose thus has a predetermined temperature which is matched to the respective spinning process when it enters the spinning bath liquid.
• the heating device 15 can preferably be an electrically operated heating device with resistance heaters.
• FIG. 2 shows a further exemplary embodiment of a spinning device which could be used, for example, in the system according to FIG. 1.
• the spinning head 3 has a housing 21 in which a spinneret 22 is arranged.
• the spinneret 22 has a multiplicity of bores from which the viscose emerges.
• An insert 18 is connected to the housing 21, at the end of which the spinneret 22 is arranged inside the housing 21.
• a feed line 2 extends through the insert 18, through which liquid viscose is fed to the spinneret 22.
• the liquid viscose previously flows through a filter 33 connected in the feed line 2.
• the feed line 2 is surrounded by a jacket tube 16.
• the jacket tube 16 and the feed line 2 form an essentially annular chamber 17.
• this has an expanding channel 23 which, together with the feed line 2, continues the chamber 17 forms.
• the chamber 17 is connected via a supply duct 27 to a supply line 28 through which a heating medium is supplied to the chamber 17.
• the insert 18 is connected to the casing tube 16 via a liquid-tight connection 24.
• the section of the line 2 adjacent to the spinneret 22 is designed in the form of a mixing chamber 19.
• Mixing elements 26 are provided in the mixing chamber 19, whereby mixing of the liquid viscose is to be achieved.
• the mouth 25 of the mixing chamber 19 is opposite the nozzle bores of the spinneret 22. As can be seen from FIG. 2, the mixing chamber 19 can be partially heated by means of the chamber 17.
• the spinneret 22 is connected to a section 30 of the insert 18 via a spinneret holder 20 and a connection 29.
• Liquid viscose is introduced into the spinning head 3 via a line 2.
• the liquid viscose flows through the mixing chamber 19 and is passed into a spinning bath liquid via the mouth 25 and the nozzle bores of the spinneret 22.
• the spinning bath liquid is introduced into the housing 21 of the spinning head via a line 31 which is connected to a pump.
• the housing 21 is provided on the side opposite the spinneret 22 with a funnel-shaped outlet 32 which opens into an adjacent spinning tube 4.
• the spinning bath liquid flows together with the filaments emerging from the nozzle openings of the spinneret 22 through the outlet 32 out of the spinning head 3.
• the spinning tube 4 is formed coaxially with the spinneret 22 and the mixing chamber 19.
• a heating medium is introduced into the chamber 17 through the supply line 28 and the supply channel 27, as a result of which the liquid viscose located in the line 2 and partly in the mixing chamber 19 is heated to a technologically advantageous temperature.
• the heating medium leaves the chamber 17 via an outlet, not shown.

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)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

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Family Applications (1)

Country Status (4)

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Family Cites Families (7)

• 1997
  • 1997-07-02 CZ CZ981033A patent/CZ103398A3/cs unknown
  • 1997-07-02 WO PCT/EP1997/003451 patent/WO1998001608A1/de not_active Application Discontinuation
  • 1997-07-02 CN CN97190847A patent/CN1197490A/zh active Pending
  • 1997-07-02 EP EP97930476A patent/EP0874928A1/de not_active Withdrawn

Non-Patent Citations (1)

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