WO1998001606A1 - Vorrichtung und verfahren zum nassspinnen - Google Patents
Vorrichtung und verfahren zum nassspinnen Download PDFInfo
- Publication number
- WO1998001606A1 WO1998001606A1 PCT/EP1997/003450 EP9703450W WO9801606A1 WO 1998001606 A1 WO1998001606 A1 WO 1998001606A1 EP 9703450 W EP9703450 W EP 9703450W WO 9801606 A1 WO9801606 A1 WO 9801606A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spinning
- line
- overflow
- main line
- pressure
- Prior art date
Links
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
Definitions
- the invention relates to a device and a method for wet spinning.
- the wet spinning process is a process in which a liquid, thread-forming substance, from a homogeneous isotropic or anisotropic single- or multi-stage liquid multi-material system, is introduced through a spinneret into a spinning bath liquid and is drawn off therefrom.
- the production of viscose filaments in which the thread-forming material is introduced into a coagulation liquid can be mentioned as an example of a wet spinning process.
- a device for wet spinning is known from EP 0 442 405 B1.
- the device comprises a spinning device which has a spinneret with a nozzle opening which opens into a spinning tube.
- the spinning nozzle is fed with the thread-forming material, which is introduced into the spinning tube through the nozzle opening.
- a spin bath liquid flows in the spin tube.
- the flowing spinning bath liquid should only slowly convert the thread-forming material into the solid phase, so that a multiple thread is formed.
- the multiple thread is drawn out of the spinning tube which is open to the atmosphere.
- the take-off speed or spinning speed and the speed of the spinning bath liquid in the spinning tube are in a specific relationship to one another.
- the warping of the thread or the individual filaments is influenced by the ratio of the spinning speed and the liquid speed.
- a plurality of spinning devices supplies the spinning bath liquid via a common main line become.
- each spinning tube of a spinning device is connected to the main line via a feed line.
- thread breaks can occur at some spinning positions of the device. If a thread break occurs, these spinning positions are switched off, whereby the supply of the spinning bath liquid into the spinning tube of the parked spinning device is interrupted.
- This procedure creates the problem that switching off some spinning devices increases the pressure level in the main line of the spinning bath liquid.
- the speed of the spinning bath liquid changes with the spinning devices in operation, which also changes the ratio of the liquid speed and the spinning speed, which influences the warping of the thread.
- the object of the present invention is to further develop the known device and a method for wet spinning so that the liquid speed within the spinning tube of a spinning device remains almost constant during the spinning process, in particular regardless of the number of spinning devices in operation.
- a pressure sensor is arranged in the main line.
- a control valve is integrated within a supply line that connects a storage container to the main line.
- the pressure sensor and the control valve are connected to one another via an evaluation device. This ensures that the evaluation device emits a signal for actuating the control valve as a function of the measured pressure. This makes it possible to keep the supply pressure of the spinning bath liquid at a predetermined level.
- a comparator is provided for evaluating the actual value of the pressure in the main line, which compares a predetermined pressure, target pressure, with the actual pressure.
- the evaluation device is coupled to a central machine control unit.
- This combination of the pressure control and the machine control has the advantage that when starting a process with high spinning speed, the spinning conditions can be kept constant from the beginning. For this purpose, it is necessary to adapt the liquid speed to the respective spinning speed, especially during the phase of starting up or running down the machine.
- a device for wet spinning is proposed with a main line, which is connected to a storage container via a supply line, and with at least one spinning device, which has a spinneret, which is connected to the main line via a feed line , having an outlet opening, the main line being connected to a line which has an overflow open to the ambient atmosphere, the overflow being formed at a distance above the outlet.
- Each outlet of a spinning tube is arranged at the same geodetic height. The distance of the overflow to the outlet is dimensioned so that it corresponds to the specified static pressure within the main line.
- the liquid level is at the level of the overflow.
- the liquid pressure within the main line and thus also within the line increases.
- the pressure rise within the main line is compensated for by the fact that the liquid runs through the overflow.
- a constant supply pressure of the spinning bath liquid is achieved within the main line, as a result of which an almost constant liquid speed is also achieved within the spinning tube.
- the device for wet spinning can be operated with different pressures in the main line. This may be necessary depending on the thread-forming material.
- the distance between the overflow and the outlet of the spinning tube is adjustable.
- the adjustability of the distance of the overflow to the outlet is preferably done in that the line is telescopic.
- the same effect can also be achieved in that a flexible line is used, the line being dimensioned sufficiently long so that the outlet can reach a predetermined geodetic height even at a maximum permissible pressure in the main line.
- An embodiment of the device is preferred in which the overflow is formed by a container-like extension of the line.
- a collecting container is provided.
- the collecting container is connected to the storage container via a return line.
- a device for wet spinning is proposed with a main line, which is connected to a storage container via a supply line, and with at least one spinning device, which has a spinneret, which leads into an outlet connected to the main line via a supply line spinning tube opens, in which the storage container, which is arranged above the outlet of the spinning tube, has an overflow open to the ambient atmosphere, the overflow being formed at a distance above the outlet.
- a static overpressure in the main line is predetermined by the storage container arranged above the outlet. If the static overpressure in the main line changes by switching off individual spinning devices, the liquid Mirror in the storage container. When the liquid level in the reservoir has reached the level of the overflow, the liquid flows out via the overflow, which compensates for the static pressure in the conduit.
- the overflow is formed by a substantially vertical pipe that partially protrudes into the storage container.
- the storage container be connected to a vertically displaceable carriage which can be locked in predetermined positions.
- the storage container have an inlet through which the spinning bath liquid can be fed into the storage container depending on the liquid level.
- the decrease in the spinning bath liquid in the storage container is relatively small, as a result of which the influence of such a decrease on the pressure in the main line has no significant influence on the liquid speed in the channel.
- the closing body be arranged on an arm articulated on the container wall, which carries a floating body.
- FIG. 1 shows a first exemplary embodiment of a device for wet spinning
- Fig. 2 shows schematically a second embodiment of a device for wet spinning
- Fig. 3 shows a third embodiment of a device for wet spinning.
- the device for wet spinning has a main line 1, which is connected to a storage container 3 via a supply line 2 and a control valve 12.
- the spinning bath liquid required for wet spinning is guided in the main line 1.
- a plurality of spinning devices 4 are connected to the main line 1.
- Fig. 1 four spinning devices are shown.
- Each spinning device 4 is connected to the main line 1 via a feed line 5.
- a check valve 6 is arranged in each feed line 5.
- Each spinning device 4 comprises a spinneret 35, to which a thread-forming material can be fed via a line 36.
- the spinneret 35 not shown, has a plurality of nozzle bores which open into a spinning tube 7.
- the spinning tube 7 has an outlet 8 at the free end.
- the liquid, thread-forming material is fed to the spinneret 35 via the line 36.
- the thread-forming material flows through the nozzle bores into the spinning tube 7.
- the spinning tube 7 is connected to the Lead 5 connected so that the spinning bath liquid can flow into the spinning tube 7.
- the spinning bath liquid flowing in the spinning tube converts the thread-forming material into a solid phase.
- the spinning bath liquid and the thread leave the spinning tube 7 through the outlet 8.
- the spinning bath liquid flowing out of the outlet 8 is collected in a collecting container (not shown) and, if necessary, fed back to the storage container 3 by a regeneration process, whereby a circulation of the spinning bath liquid is achieved.
- the relevant spinning device 4 is switched off.
- the shut-off valve 6 of the relevant spinning device 4 is also closed, as a result of which the spinning bath liquid can no longer flow from the main line through the relevant supply line 5 into the relevant spinning tube 7.
- Such switching off of one or more spinning devices 4 leads to an increase in pressure within the main line 1.
- a pressure sensor 9 is provided in the main line 1, which measures the supply pressure in the main line 1.
- the pressure sensor 9 is connected by an electrical connection 11 to an evaluation device 10, to which the measurement signals of the pressure sensor 9 are transmitted.
- the evaluation device 10 compares the measured pressure (actual pressure) with a predetermined pressure (target pressure). If the difference between the actual pressure and the target pressure is greater than a predetermined limit value, the control valve 12 is actuated by the evaluation device 10, which is arranged in the supply line 2.
- the quantity of liquid which is fed to the main line 1 is adjusted or changed by the control valve 12 in such a way that the predetermined target pressure in the main line is reached. Through this This ensures that the liquid velocity at each spinning device in operation is kept almost constant.
- the evaluation device 10 is connected to a central machine control 37.
- the central machine control 37 specifies a pressure value (target pressure) for the evaluation device 10. This makes it possible to adapt the supply pressure in the main line 1 to the particular operating state of the machine. In particular when the machine starts up, the multifilament thread is drawn out of the spinning tube 7 at a lower spinning speed. In this phase of the process the liquid speed in the spinning tube 7 must be adapted to the spinning speed. This adjustment is carried out by the pressure control in the main line 1. This means that the thread scrap can be considerably reduced.
- the device for wet spinning comprises a main line 1, which is connected via a supply line 2 to a storage container, not shown.
- the device comprises a plurality of spinning devices 4, each of which is connected to the main line 1 via a feed line 5.
- the structure of each spinning device 4 corresponds to the structure of the spinning devices known per se.
- a valve 6, which serves as a shut-off device for the supply line 5, is arranged in each supply line 5.
- the main line 1 is connected to a line 13.
- the line 13 has an overflow 14 which is open to the ambient atmosphere.
- the overflow 14 is formed at a distance h above the outlet 8 of the spinning tube 7. In the case of a plurality of spinning devices 4, each outlet 8 lies on the same horizontal plane.
- the distance h of the overflow 14 is adjustable.
- the line 13 is telescopic. It has a first outer line section 13a and an inner line section 13b which can be moved vertically in the outer line section 13a.
- a sealing device 15 is provided between the line sections 13a and 13b, so that liquid cannot escape between the inner jacket of the outer line section 13a and the outer jacket of the inner line section 13b.
- an actuating device 16 is provided, by means of which the inner line section 13b can be pulled out of the outer line section 13a or retracted into the latter, as is indicated in FIG. 2.
- the overflow 14 is formed by a container-like extension.
- a collecting container 17 is formed below the overflow 14 and has a return line 18.
- the return line 18 can be connected directly or indirectly to a storage container (not shown).
- the device comprises a plurality of spinning devices 4 which are connected to the main line 1.
- Each spinning device 4 has a spinneret 35, to which a thread-forming material can be fed through the line 36.
- each spinning device 4 has a spinning tube 7 which is connected to the main line 1 via a feed line 5.
- a valve 6 is arranged in each feed line 5.
- the main line 1 is connected to a reservoir 3 via a supply line 2.
- the storage container 3 is arranged above the outlet 8 of each spinning tube 7 of the spinning devices 4.
- the storage container 3 has an overflow 14 which is open to the ambient atmosphere, the overflow 14 being formed at a distance h above the outlet 8.
- the overflow 14 is formed by an essentially vertically extending pipe 19 which partially protrudes into the storage container 3.
- the storage container 3 is connected to a carriage 20 which is vertically displaceable.
- the carriage 20 is guided in two guides 21, 22 arranged at a distance from one another and in parallel.
- Each guide 21, 22 has through bores 23 which are formed one above the other at a distance from one another.
- a bolt 24 is guided through a bore 23 for locking the slide 20 and engages in a locking bore 25 of the slide 20.
- the supply line 2 is designed telescopically.
- the supply line 2 has a first line section 2a, which is connected to the main line 1.
- a second line section 2b which is connected to the bottom 26 of the storage container 3, engages in the first line section 2a.
- the second line section 2b is dimensioned such that it cannot be led out of the first line section 2a even when the storage container 3 is in a maximum position.
- the second Line section 2b also dimensioned such that when the storage container 3 is at a minimum position, it does not abut the wall of the main line 1.
- a seal is arranged between the first line section 2a and the second line section 2b. The sections 2a and 2b of the supply line 2 can also be guided.
- the storage container 3 has an inlet 28 through which a liquid can be introduced into the storage container 3.
- the inlet 28 is connected to the top wall 29 of the storage container 3.
- the outlet opening 30 of the inlet 28 can be closed by means of a closing body 31, so that only a predetermined amount of a liquid can be supplied to the storage container 3.
- the closing body 31 is arranged on an arm 32 which is articulated on the container wall 33.
- the arm 32 carries a floating body 34. If the liquid level within the storage container 3 drops, the arm 32 is pivoted downward, as a result of which the closing body 31 clears the outlet opening 30 of the inlet 28.
- FIG. 3 shows a position of the closing body 31 in which the outlet opening 30 of the inlet 28 is open.
- the difference in level between the liquid level in the storage container 3 and the main line 1 determines the static pressure of the liquid within the main line 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97930475A EP0874924A1 (de) | 1996-07-04 | 1997-07-02 | Vorrichtung und verfahren zum nassspinnen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19626971.7 | 1996-07-04 | ||
DE19626971 | 1996-07-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998001606A1 true WO1998001606A1 (de) | 1998-01-15 |
Family
ID=7798929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/003450 WO1998001606A1 (de) | 1996-07-04 | 1997-07-02 | Vorrichtung und verfahren zum nassspinnen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0874924A1 (de) |
CN (1) | CN1197489A (de) |
CZ (1) | CZ103498A3 (de) |
WO (1) | WO1998001606A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110961017B (zh) * | 2019-11-26 | 2022-09-20 | 浙江嘉华特种尼龙有限公司 | 全自动纺丝乳化油供给系统 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5019316A (en) * | 1986-07-03 | 1991-05-28 | Toray Industries, Inc. | Method for producing thermoplastic synthetic yarn |
EP0442405A2 (de) * | 1990-02-16 | 1991-08-21 | Akzo Nobel N.V. | Verfahren und Vorrichtung zur Herstellung von Formkörpern |
EP0534895A1 (de) * | 1991-09-23 | 1993-03-31 | Maschinenfabrik Rieter Ag | Streckkammeranordnung |
-
1997
- 1997-07-02 EP EP97930475A patent/EP0874924A1/de not_active Withdrawn
- 1997-07-02 CZ CZ981034A patent/CZ103498A3/cs unknown
- 1997-07-02 CN CN97190844A patent/CN1197489A/zh active Pending
- 1997-07-02 WO PCT/EP1997/003450 patent/WO1998001606A1/de not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5019316A (en) * | 1986-07-03 | 1991-05-28 | Toray Industries, Inc. | Method for producing thermoplastic synthetic yarn |
EP0442405A2 (de) * | 1990-02-16 | 1991-08-21 | Akzo Nobel N.V. | Verfahren und Vorrichtung zur Herstellung von Formkörpern |
EP0534895A1 (de) * | 1991-09-23 | 1993-03-31 | Maschinenfabrik Rieter Ag | Streckkammeranordnung |
Also Published As
Publication number | Publication date |
---|---|
EP0874924A1 (de) | 1998-11-04 |
CZ103498A3 (cs) | 1998-07-15 |
CN1197489A (zh) | 1998-10-28 |
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