Spinning device and method for spinning up a spinning device, and spin-up device

Patent metadata

Field	Value
Publication number	US-11718930-B2
Application number	US-201816754965-A
Country	US
Kind code	B2
Filing date	Oct 8, 2018
Priority date	Oct 12, 2017
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The invention shows a spin-up device (11, 51) and a method for spinning up a spinning device (1, 101) for the continuous extrusion of molded bodies (3) from a spinning solution (6), containing a solvent and cellulose dissolved in the solvent, wherein the molded bodies are extruded from the spinning solution (6) through spinnerets (7) of the spinning device (1, 101) in the form of a loose spinning curtain (2), the molded bodies (3) of the loose spinning curtain (2) are combined into a molded body bundle (4) after the extrusion, and the molded body bundle (4) is, in a further step, fed to a draw-off member (10) of the spinning device (1, 101) in order to start a continuous extrusion of the molded bodies (3). In order to make the spin-up method simpler in terms of process technology and more reproducible, it is proposed to increase the tensile strength of at least some areas of the molded bodies (3) of the loose spinning curtain (2) after their extrusion and before combining them into a molded body bundle (4).

First claim

What is claimed is:

1. A method for spinning up a spinning device for the continuous extrusion of molded bodies from a spinning solution comprising a solvent and cellulose dissolved in the solvent, 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 twisted around a torsion axis via a rotating member 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 tensile strength of the molded bodies of the loose spinning curtain, after their extrusion and before combining them into a molded body bundle, is increased in at least some areas, wherein an automatic gripper grabs the molded body bundle and feeds it to the draw-off member of the spinning device by machinery, and wherein the rotating device, draw-off member and automatic gripper are configured to spin-up the spinning device.

2. The method according to claim 1 , wherein the tensile strength of the molded bodies is increased in at least some areas such that the molded bodies will substantially not rupture due to their own weight.

3. The method according to claim 1 , wherein by virtue of the increase in tensile strength in at least some areas an engagement area is created on the molded body bundle, where the molded bodies have a viscosity that is increased as compared to the spinning solution.

4. The method according to claim 3 , wherein the viscosity is increased 1.5-fold as compared to the spinning solution.

5. The method according to claim 1 , wherein combining of the molded bodies into the molded body bundle and/or feeding the molded body bundle to the draw-off member is done by machinery.

6. The method according to claim 1 , wherein the automatic gripping device grabs the molded body bundle in an engagement area.

7. The method according to claim 1 , wherein the molded bodies, after their extrusion, are cooled in order to increase their tensile strength.

8. The method according to claim 7 , wherein the temperature of the molded bodies after cooling by at least 10° C. is lower than the temperature of the spinning solution.

9. The method according to claim 8 , wherein the temperature of the molded bodies after cooling by at least 20° C. is lower than the temperature of the spinning solution.

10. The method according to claim 7 wherein the cooling of the molded bodies is carried out by blowing a cooling air stream at least some areas thereof.

11. The method according to claim 7 wherein the cooling of the molded bodies is carried out by spraying at least some areas with a cooling liquid or by immersing at least some areas in a cooling.

12. The method according to claim 11 , wherein the cooling liquid contains a coagulant for the dissolved cellulose.

13. The method according to claim 11 , wherein the cooling liquid is an aqueous solution.

14. The method according to claim 1 , wherein the molded bodies are combined into the molded body bundle by machinery by one or a combination of several of the following steps:
torsion of the spinning curtain around a torsion axis,
encircling the spinning curtain with a sling and pulling the sling tight, or passing the spinning curtain through a funnel of decreasing cross-section.

15. The method according to claim 1 , wherein the automatic gripper is a gripper on a manipulator arm.

16. A spin-up device for spinning up a spinning device comprising a bundling device for bundling of molded bodies extruded from the spinnerets of the spinning device into a molded body bundle, wherein the bundling device includes a rotating member that is configured to twist the molded bodies around a torsion axis to combine the molded bodies into the molded body bundle, wherein the spin-up device includes a first manipulator arm with a first end effector, the first end effector including a gripper configured to grab the molded body bundle, and wherein the bundling device and manipulator arm are configured to spin-up the spinning device.

17. The spin-up device according to claim 16 , wherein the spin-up device includes a second manipulator arm with a second end effector, the second end effector including the bundling device.

18. The spin-up device according to claim 16 , wherein the rotating member is a turntable.

19. A spinning device for the continuous extrusion of molded bodies, which comprises at least a spinning bath container comprising spinning bath, spinnerets associated with the spinning bath container for the extrusion of the molded bodies from the spinnerets into the spinning bath, and a spin-up device for spinning up the spinning device according to claim 16 .

20. The spinning device according to claim 19 , wherein the spinning device comprises a cooler, for increasing the strength of the extruded molded bodies in at least some areas.

21. The spinning device of claim 19 , wherein the spinning device is for the extrusion of cellulosic molded bodies from a spinning solution comprising water, cellulose, and tertiary amine oxide.

22. The spinning device according to claim 19 , wherein the spinning device comprises a coagulant applicator, for increasing the strength of the extruded molded bodies in at least some areas.

Assignees

• Chemiefaser Lenzing Ag

Inventors

• Dürnberger Franz Alfred
• Schrempf Christoph
• Sperger Christian

Classifications

• D01D5/06

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title

• D01D5/02 Primary

  Starting the formation · CPC title

• B65H51/02

  Rotary devices, e.g. with helical forwarding surfaces (devices for temporarily storing filamentary material during forwarding B65H51/20; driven rotary devices for controlling tension B65H59/18) · CPC title

• B65H54/00

  Winding, coiling, or depositing filamentary material (cores, formers, holders, cans or receptacles B65H75/02) · CPC title

• D01D4/022

  Processes or materials for the preparation of spinnerettes · CPC title