Reusing of lyocell-cellulose for lyocell-methods

Patent metadata

Field	Value
Publication number	US-11519100-B2
Application number	US-201916962207-A
Country	US
Kind code	B2
Filing date	Jan 14, 2019
Priority date	Jan 15, 2018
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

Method of manufacturing a cellulose-regenerated-molded body, wherein the method comprises supplying a starting material which is manufactured by a lyocell-method and which comprises cellulose, which is manufactured by solving a cellulose source in a solvent for manufacturing a spinning mass, by extruding the spinning mass and by subsequently precipitating in a spinning bath, solving the starting material which comprises cellulose, in a solvent for manufacturing a spinning mass, and extruding, and subsequently precipitating the spinning mass in a spinning bath, wherein thereby the molded body is obtained.

First claim

The invention claimed is:

1. Method of manufacturing a cellulose-regenerated-molded body, wherein the method comprises:
supplying a starting material which is manufactured by a lyocell-method and which comprises cellulose, which is manufactured
by solving a cellulose source in a solvent for manufacturing a spinning mass,
by extruding the spinning mass, and
by subsequently precipitating in a spinning bath;

solving the starting material which comprises cellulose in a solvent for manufacturing a spinning mass, wherein solving the starting material is performed by a direct solving method; and
extruding and subsequently precipitating the spinning mass in a spinning bath, wherein thereby the molded body is obtained.

2. Method according to claim 1 , wherein the spinning bath for the solved starting material which comprises cellulose comprises water and solvent.

3. Method according to claim 1 , wherein the spinning bath for the solved cellulose source comprises water and solvent.

4. Method according to claim 1 , wherein the molded body is a filament, a fiber, a foil, a sponge or a sphere.

5. Method according to claim 1 , wherein the method comprises performing a further lyocell-method which comprises:
solving the molded body in a solvent for manufacturing a spinning mass; and
extruding and subsequently precipitating the spinning mass in a spinning bath, wherein thereby another molded body is obtained.

6. Method according to claim 1 , wherein the method comprises comminuting the starting material prior to solving the starting material in the solvent.

7. Method according to claim 1 , wherein the method comprises solving the starting material in the solvent without chemical pretreatment of the starting material.

8. Method according to claim 1 , wherein the method comprises at least partially cleaning the starting material prior to solving the starting material in the solvent.

9. Method according to claim 8 , wherein the cleaning comprises at least partially removing colorants from the starting material prior to solving the starting material in the solvent.

10. Method according to claim 1 , wherein the starting material, prior to precipitating it is at least partially freed from cross-linkers which are cross-linking fibers of the starting material.

11. Method according to claim 1 , comprising at least one of the following features:
wherein the starting material is completely or partially made of remains from a clothing manufacture and/or of old clothes;
wherein the starting material, prior to precipitating it is mixed with another starting material which comprises cellulose, wherein the other starting material comprises at least one material of a group which is consisting of wood pulp, rags pulp, textiles, clothes, cotton, and cellulose manufactured by a viscose-method;
wherein the method comprises postprocessing the precipitated molded body;
wherein the solving of the starting material and/or the solving of the cellulose source is performed by a direct solving method and/or by tertiary amine oxides and/or by ionic liquids as solvent;
wherein the solving of the starting material and the subsequent precipitating of the molded body is performed by a lyocell-method.

12. Method according to claim 1 , wherein the method comprises manufacturing the starting material which comprises cellulose by means of:
solving the cellulose source in the solvent for manufacturing the spinning mass; and
extruding and subsequently precipitating the spinning mass in the spinning bath.

13. Method according to claim 1 , wherein fibers of the starting material or the molded body comprise a smooth round outer surface.

14. Use of a starting material which is manufactured by a first lyocell-method and which comprises cellulose, for manufacturing a molded body which comprises cellulose, by treating the starting material by a second lyocell-method.

15. Use according to claim 14 , wherein as at least a part of the starting material, textiles are used.

Assignees

• Chemiefaser Lenzing Ag

Inventors

• Klaus-Nietrost Christoph
• Herchl Richard
• Weilach Christian
• Sperger Christian

Classifications

• C08J11/06

  without chemical reactions · CPC title

• Y02P20/582

  Recycling of unreacted starting or intermediate materials · CPC title

• D01F2/02

  from solutions of cellulose in acids, bases or salts · CPC title

• D01D5/06

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

• Y02W30/62

  Plastics recycling; Rubber recycling · CPC title