Method and device for producing tubular cellulosic spun-bonded nonwoven fabrics

Patent metadata

Field	Value
Publication number	US-2022018048-A1
Application number	US-201917299606-A
Country	US
Kind code	A1
Filing date	Dec 4, 2019
Priority date	Dec 5, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A device for producing a seamless tubular cellulosic spunbonded nonwoven fabric, comprising a spinning dope production ( 8 ), a spinning system ( 2 ), a coagulation system ( 4 ), a deposition section ( 3 ) for depositing and dewatering the spunbonded nonwoven, a transport device ( 13, 22 ) for carrying off the spunbonded nonwoven in the transport direction, a washing system ( 5 ) and a drying system ( 6 ), wherein the deposition section ( 3 ) is designed so as to be rotatable, with the axis of rotation of the deposition section ( 3 ) lying along the transport direction.

First claim

1 . A device for producing a seamless tubular cellulosic spunbonded nonwoven fabric, comprising:
a spinning dope production, a spinning system, a coagulation system, a deposition section for depositing and dewatering the spunbonded nonwoven, a transport device for carrying off the spunbonded nonwoven in a transport direction, a washing system and a drying system,
wherein the deposition section is designed so as to be rotatable, with an axis of rotation of the deposition section lying along the transport direction.

2 . The device according to claim 1 , further comprising at least one suction device associated with the deposition section.

3 . The device according to claim 2 , wherein the at least one suction device is inclined at least in sections.

4 . The device according to claim 1 , further comprising a cutting unit.

5 . A method of producing a seamless multi-layered tubular cellulosic spunbonded nonwoven fabric, comprising:
processing cellulose into a spinning dope and, subsequently, extruding the spinning dope with a spinning system to form drawn filaments by using hot air, and moistening the drawn filaments, before a deposition, with a coagulation liquid in such a way that adhesions will form at least between the drawn filaments or across several layers during the deposition, wherein the drawn filaments are deposited on a rotating tray, dewatered, washed and dried.

6 . The method according to claim 5 , further comprising washing a solvent out of the spunbonded nonwoven and supplying it to a solvent recovery.

7 . The method according to claim 6 , further comprising extracting process air and supplying it to the solvent recovery.

8 . A seamless tube comprising several layers of drawn cellulose filaments, wherein the cellulose filaments adhere to each other in each layer section wise, and wherein the individual layers adhere to each other section wise, with the tube being essentially free from binders.

9 . A filter comprising a tube according to claim 8 .

10 . The filter according to claim 9 , wherein the filter is used for at least one of: adsorption, chemical bonding or absorption of substances from gases, liquids and emulsions, separation of emulsions, dedusting of waste gases, as a droplet separator, decolorization of liquids, disinfection of gases and liquids, drinking water treatment, water softening, separating oil from gases, separating emulsions, deodorization in the food industry.

11 . A method according to claim 5 , wherein the drawn filaments adhere to each other section wise.

Assignees

• Chemiefaser Lenzing Ag

Inventors

• Sagerer-Foric Ibrahim

Classifications

• D06M2101/06

  cellulosic · CPC title

• D06M13/535

  Suction; Vacuum treatment; Degassing; Blowing · CPC title

• D04H3/073 Primary

  Hollow cylinder shaped · CPC title

• D04H3/03

  at random · CPC title

• B01D39/18

  the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14) · CPC title