SPINNING DEVICE AND METHOD FOR SPINNING UP A SPINNING DEVICE

Abstract

What is shown is a spinning device (1) and a method for spinning up a spinning device (1) for the continuous extrusion of molded bodies (3) from a spinning solution (6), as well as a spin-up device (11) for the execution of the method, in which method the molded bodies (3) are extruded from the spinning solution (6) through spinnerets (7) of the spinning device (1) in the form of a loose spinning curtain (2), the molded bodies (3) of the loose spinning curtain (2) are, after the extrusion, combined into a molded body bundle (4), and the molded body bundle (4) is, in a further step, fed to a draw-off member (10) of the spinning device (1) in order to start a continuous extrusion of the molded bodies (3). In order to make the method for spinning up the spinning device (1) simpler and more reproducible, it is proposed that the molded bodies (3) be combined into the molded body bundle (4) by twisting the spinning curtain (2) around a torsion axis (20).

Claims

1. A method for spinning up a spinning device for the continuous extrusion of molded bodies from a spinning solution, wherein the molded bodies are extruded from the spinning solution through spinnerets of the spinning device in the form of a loose spinning curtain, the molded bodies of the loose spinning curtain are combined into a molded body bundle after the extrusion, and the molded body bundle is, in a further step, fed to a draw-off member of the spinning device in order to start a continuous extrusion of the molded bodies, wherein the molded bodies are combined into the molded body bundle by twisting the spinning curtain around a torsion axis.

2. The method according to claim 1, wherein the torsion axis extends substantially parallel to the extrusion direction of the molded bodies.

3. The method according to claim 1, wherein the molded bodies of the spinning curtain are deposited with their ends on a rotatable torsion means of a rotation device, which torsion means, through its rotation, causes the torsion of the spinning curtain.

4. The method according to claim 3, wherein the rotation device is positioned underneath the spinning curtain such that the ends of the molded bodies, after their extrusion, come to rest on the non-moving torsion means, and that the torsion means, after the ends of the molded bodies have been deposited, is accelerated in its rotational velocity until reaching a final velocity.

5. The method according to claim 3, wherein the torsion means is formed as a rotatable turntable and that the rotation axis of the turntable extends substantially parallel to the extrusion direction of the molded bodies.

6. The method according to claim 5, characterized in that the ends of the molded bodies adhere to holding elements of the turntable and that the holding elements, through the rotation of the turntable, cause a torsion of the spinning curtain.

7. The method according to claim 1, wherein the torsion of the spinning curtain creates an engagement area on the molded body bundle.

8. The method aaccording to claim 1, wherein an automatic gripping device grabs the molded body bundle in the engagement area and feeds it to a draw-off member of the spinning device.

9. A spin-up device which comprises a bundling device for bundling of molded bodies extruded from spinnerets of the spinning device into a molded body bundle, which bundling device includes a rotation device with at least one means that is rotatable around a rotation axis, the rotatable means being configured such that the molded bodies are combined into the molded body bundle with the help of said means, wherein the rotatable means is formed as a torsion means, for the torsion of the molded bodies, and that the rotation axis of the torsion means is substantially parallel to the extrusion direction of the molded bodies.

10. The spin-up device according to claim 9, wherein the torsion means is configured for twisting the extruded molded bodies around a common torsion axis and that the torsion axis of the molded bodies coincides with the rotation axis of the torsion means.

11. The spin-up device according to claim 9, wherein the torsion means includes holding elements to increase the adhesion between the molded bodies and the torsion means, the holding elements.

12. The spin-up device according to claim 9, wherein the spin-up device includes a first manipulator arm with a first end effector, the first end effector including a gripper for grabbing a molded body bundle.

13. The spin-up device according to claim 9, wherein the spin-up device includes a second manipulator arm with a second end effector, the second end effector including the bundling device.

14. The spin-up device according to claim 9 or 13, wherein the bundling device is configured as displaceable between a rest position and a use position.

15. A spinning device for the continuous extrusion of molded bodies from a spinning solution, comprising at least a spinning bath container containing spinning bath, spinnerets associated with the spinning bath container for the extrusion of the molded bodies from the spinnerets into the spinning bath, with a spin-up device for spinning up the spinning device according to claim 9.

16. Use of a rotation device comprising a torsion means that is rotatable with respect to a spinning device, for bundling of molded bodies extruded from the spinnerets of the spinning device into a molded body bundle by twisting these molded bodies by means of the torsion means.

17. The method according to claim 1, wherein the spinning solution comprises water, cellulose, and tertiary amine oxide.

18. The method according to claim 2, wherein the torsion axis extends through the center of the spinning curtain.

19. The method according to claim 7 wherein the torsion of the spinning curtain creates an engagement area in the area of the smallest diameter of the twisted molded body bundle.

20. The method according to claim 8, wherein the automatic gripping device is a gripper on a manipulator arm.

21. The method according to claim 8, wherein the automatic gripping device grabs the molded body bundle after the torsion means reaches a final velocity.

22. The spin-up device according to claim 9, wherein the rotatable means is a turntable.

23. The spin-up device according to claim 11, wherein the holding elements are hooks.

24. The spin-up device according to claim 14, wherein the bundling device is configured as displaceable between a rest position and a use position by means of the second manipulator arm.

25. The spinning device according to claim 15, wherein the molded bodies are cellulosic molded bodies extruded from a spinning solution comprising water, cellulose, and tertiary amine oxide.

26. The use according to claim 16, wherein the torsion means is a turntable.

Description

SHORT DESCRIPTION OF THE DRAWINGS

[0036] Hereinafter, the subject-matter of the invention is illustrated by way of example with reference to an embodiment, wherein:

[0037] FIG. 1 shows a partially broken side view of the spinning device according to the invention prior to the execution of the method according to the invention for spinning up the spinning device;

[0038] FIG. 2 shows a schematic view of the method according to the invention for spinning up the spinning device during a first method step;

[0039] FIG. 3 shows a schematic view of the method according to the invention during a further method step;

[0040] FIG. 4 shows a partially broken side view of the spinning device according to the invention after completion of the spin-up method; and

[0041] FIG. 5 shows a partial plan view of a rotation device of the spinning device according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0042] Referring to FIGS. 1 to 4, a spinning device 1 in various stages of the spin-up process is shown. FIG. 1 shows the spinning device 1 with the loose spinning curtain 2 of extruded molded bodies 3 prior to spin-up, i.e., before the molded bodies 3 are combined into a molded body bundle 4 in a bundling device 5 as shown in FIG. 2. Furthermore, the spinning device 1 includes a spinning solution 6 that is extruded through a plurality of spinnerets 7 to form the molded bodies 3. In this case, the spinning solution 6 is preferably a solution containing water, cellulose, and a tertiary amine oxide. Underneath the spinnerets 7, a spinning bath container 8 is provided that contains a spinning bath 9. Preferably, a mixture of water and a tertiary amine oxide is used as the spinning bath 9.

[0043] FIG. 4, for its part, shows the spinning device 1 after spin-up. Accordingly, the molded bodies 3 have been combined into a molded body bundle 4 by the bundling device 5, and the molded body bundle 4 is being transported continuously by a draw-off member 10 of the spinning device 1, whereby a continuous extrusion of molded bodies 3 from the spinnerets 7 is taking place.

[0044] As can also be seen in FIG. 1, the spinning device 1 includes a spin-up device 11 for executing the method for spinning up the spinning device 1, the spin-up device 11 including a bundling device 5, a first manipulator arm 12, and a second manipulator arm 13. On the first manipulator arm 12, a first end effector 14 is provided, which end effector 14 is formed as a gripper 16. In this case, the gripper 16 is configured such that it can force-fittingly enclose and grab the molded body bundle 4. Furthermore, the gripper 16 is movably and controllably connected to the first manipulator arm 12. In connection with the free movability of the manipulator arm 12, the gripper 16 can move the grabbed molded body bundle 4 along nearly any given trajectory.

[0045] Furthermore, the spin-up device 11 includes a rotation device 17 that causes the torsion of the molded bodies 3 in the loose molded body curtain 2. To this end, the rotation device 17 includes a rotatable torsion means 18 that is preferably formed as a turntable 31, the torsion means 18 and the turntable 31, respectively, being provided as an end effector 15 on the second manipulator arm 13 and performing the function of the bundling device 5. The rotation axis 19 of the torsion means 18 and thus the torsion axis 20 of the spinning curtain 2 is, more particularly, arranged in parallel to the extrusion direction 32 of the molded bodies 3 in the loose spinning curtain 2.

[0046] FIG. 5 shows a detailed plan view of the rotation device 17 of the spin-up device 11. In order to guarantee a reliable torsion of the spinning curtain 2, holding elements 24 in the form of hooks 25 are provided on the torsion means 18 and particularly on the turntable 31, respectively. As a result, the molded body ends 23 can reliably adhere to the hooks 25 and impart torsion to the spinning curtain 2 via the rotating motion of the torsion means 18.

[0047] The torsion means 18 serving as a bundling device 5 can be advanced and retracted between the spinnerets 7 and the spinning bath container 8 by means of the second manipulator arm 13, whereby the bundling device 5 can be displaced from a rest position 21 to a use position 22 as needed. Thus, the bundling device 5 can remain in the rest position 21 during the continuous extrusion of the molded bodies 3 and will not constitute an obstacle between the spinnerets 7 and the spinning bath container 8. If renewed spinning up of the spinning device 1 becomes necessary, then the bundling device 5 can be displaced to the use position 22 and permit the execution of a spin-up method according to the invention.

[0048] The inventive method for spinning up the spinning device 1 is shown schematically in FIGS. 1 to 4. FIG. 1 shows the spinning device 1 in the first step of the spin-up method. The molded bodies 3 are extruded from the spinnerets 7 in the form of a loose spinning curtain 2. In a further stepas shown schematically in FIG. 2the bundling device 5, more particularly the torsion means 18 and the turntable 31, respectively, is positioned between the spinnerets 7 and the spinning bath container 8 such that the ends 23 of the extruded molded bodies 3 come to rest on the torsion means 18. The molded body ends 23 adhere to the holding elements 24 and hooks 25, respectively, of the torsion means 18 formed as a turntable 31, thus increasing the adhesion between the molded bodies 3 and the torsion means 18 so that undesired gliding of the molded bodies 3 on the torsion means 18 is prevented. Preferably, the torsion means 18 is at standstill at the beginning of the method, however, it can also be put into rotation before the molded body ends 23 impinge on the torsion means 18. After the molded body ends 23 have impinged on the torsion means 18, the rotational velocity of the torsion means 18 will be increased until a predetermined final velocity is reached. This can, for example, be done in steps or continuously according to a predefined acceleration profile. The rotation of the torsion means 18 causes the spinning curtain 2 to be twisted around the torsion axis which is preferably located parallel to the extrusion direction 32 of the molded bodies 3 and passes through the center of the spinning curtain 2. The final velocity of the torsion means 18 of the rotation device 17 determines the desired draw-off velocity of the molded bodies 3 from the spinnerets 7 for the spin-up procedure and thus, for example, the desired fiber titer during spin-up. Furthermore, the diameter 28 of the molded body bundle 4 can be influenced via the rotational velocity. In this method, diameters 28 from 1 to 20 cm, more preferably from 3 to 12 cm, have proven particularly preferable, as such diameters 28 permit the simple and reliable handling of the molded body bundle 4 with a gripper 16. The torsion of the spinning curtain 2 creates an engagement area 29 on the molded body bundle 4, which is preferably located in the area of the smallest diameter 28 of the molded body bundle 4. Furthermore, the torsion of the spinning curtain 2 also leads to the formation of a vertex 30 on the twisted spinning curtain 2, the smallest diameter 28 of the molded body bundle 4 substantially being at the vertex 30.

[0049] FIG. 2 shows the spinning device 1 according to FIG. 1 after the torsion means 18 has been displaced from its rest position 21 to its use position 22 by means of the second manipulator arm 13 and positioned between the spinnerets 7 and the spinning bath container 8. Then, in a second method step, the spinning curtain 2 was produced as described hereinabove by means of the rotation of the torsion means 18, and thus the molded body bundle 4 was created.

[0050] Furthermore, FIG. 3 shows the spinning device 1 after the molded body bundle 4 has been created through torsion of the spinning curtain 2. The molded body bundle 4 is now grabbed by the gripper 16 on the first manipulator arm 12 of the spin-up device 11 in order to subsequently provide the molded body bundle 4 to a draw-off member 10 of the spinning device 1.

[0051] In this case, FIG. 4 shows the last method step, wherein the molded body bundle 4 held reliably by the gripper 16 is first transported through the spinning bath 9 around a deflection member 26 in the spinning bath container 8 by means of the first manipulator arm 12. Subsequently, the molded body bundle 4 is moved out of the spinning bath container 8 again and inserted into the draw-off member 10 which more particularly consists of a row of juxtaposed draw-off godets 27. Following the insertion of the molded body bundle 4 into the draw-off member 10, a continuous extrusion of the molded bodies 3 from the spinnerets 7 is possible, and the spin-up process has thus been completed successfully.