Functionalization of foreign material in lyocell-methods

Patent metadata

Field	Value
Publication number	US-11519101-B2
Application number	US-201916962209-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 regenerated cellulosic molded body, wherein the method comprises supplying a starting material which comprises cellulose and at least one foreign matter, transferring at least a part of the starting material with at least a part of the at least one foreign matter into a spinning mass which additionally contains a solvent for solving at least a part of the cellulose of the starting material in the solvent, and extruding the spinning mass to the molded body, and subsequently precipitating in a spinning bath, wherein thereby the molded body is obtained, wherein the molded body comprises cellulose and at least a part of the at least one foreign matter.

First claim

The invention claimed is:

1. Method of manufacturing a regenerated cellulosic molded body, wherein the method comprises:
supplying a starting material which comprises cellulose and at least one foreign matter, wherein the cellulose and the at least one foreign matter of the starting material, when being supplied, are present in a common solid body composite;
transferring at least a part of the starting material with at least a part of the at least one foreign matter into a spinning mass which additionally contains a solvent for solving at least a part of the cellulose of the starting material in the solvent;
selectively adjusting a desired or pre-given residual concentration of the at least one foreign matter in the molded body for obtaining a technical function of the at least one foreign matter in the molded body; and
extruding the spinning mass to the molded body and subsequently precipitating in a spinning bath, wherein thereby the molded body is obtained, wherein the molded body comprises cellulose and at least a part of the at least one foreign matter.

2. Method according to claim 1 , wherein the method comprises at most partially removing at least one of the at least one foreign matter by separating a part of the at least one foreign matter from the cellulose of the starting material to precipitating.

3. Method according to claim 1 , wherein the starting material comprises or consists of a cellulose source to be recycled that is completely or partially made of remains of a clothing manufacture and/or made of old clothes.

4. Method according to claim 1 , wherein the at least one foreign matter comprises at least one of a group which is consisting of a colorant, an optical brightener, a matting agent, and an antimicrobial substance.

5. Method according to claim 1 , wherein the at least one foreign matter comprises elastane which, during solving the cellulose, is also at least partially solved.

6. Method according to claim 1 , wherein the at least one foreign matter comprises polyester which is at least partially retained in the starting material, when the starting material is at least partially solved.

7. Method according to claim 1 , wherein the method comprises at least partially removing non-cellulosic fibers from the starting material prior to precipitating.

8. Method according to claim 1 , wherein the method comprises at least partially removing metals from the starting material.

9. Method according to claim 1 , wherein in the method the regenerated cellulosic molded body is manufactured without performing a bleaching procedure.

10. Method according to claim 1 , wherein, prior to solving, the starting material is presorted by colors in multiple color groups and respectively only presorted starting material of a common color group is solved.

11. Method according to claim 1 , wherein the at least one foreign matter which is present in the molded body has a portion of at least 0.01 weight percent with respect to the total weight of the molded body.

12. Method according to claim 1 , wherein as molded body one of a group is manufactured which is consisting of fibers, foils, sponges or spheres.

13. Method according to claim 1 , comprising at least one of the following features:
wherein precipitating is caused by diluting the starting material solved in the spinning mass, by an aqueous environment in the spinning bath;
wherein the method comprises comminuting, the starting material prior to solving the starting material in the solvent;
wherein the starting material, prior to precipitating is at least partially freed from cross-linkers which are cross-linking fibers of the starting material;
wherein the starting material, prior to its precipitating in the solvent is combined with another cellulose source, wherein in particular the other cellulose source comprises a material of a group which is consisting of wood pulp, rags pulp, cotton, cellulose manufactured by a lyocell-method, and cellulose manufactured by a viscose-method;
wherein the method comprises postprocessing the precipitated molded body;
wherein solving the starting material is performed by a direct solving method and/or by tertiary amine oxides as solvent;
wherein the method is performed such that, based on a control command, an amount of the at least one foreign matter which is retained in the molded body to be manufactured, is adjusted in a user-defined manner;
wherein the common solid body composite comprises at least one of a group which is consisting of a textile planar structure, a fiber composite and a molded body composite;
wherein the method comprises further processing of manufactured molded bodies to a product.

14. The method according to claim 1 , wherein manufacturing the regenerated cellulosic molded body comprises a lyocell method or a viscose method.

15. The method according to claim 1 , comprising at least one of the following features:
wherein elastane is used as foreign matter, in order to impart elasticity to the manufactured molded body;
wherein polyester is used as foreign matter, in order to impart a thermoplastic deformability and/or an increased mechanical stability to the molded body.

Assignees

• Chemiefaser Lenzing Ag

Inventors

• Klaus-Nietrost Christoph
• Herchl Richard
• Weilach Christian

Classifications

• D01F1/10 Primary

  Other agents for modifying properties · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B29K2467/00

  Use of polyesters {or derivatives thereof} as filler · CPC title

• D01F2/08 Primary

  Composition of the spinning solution or the bath · CPC title

• D01D1/02

  Preparation of spinning solutions · CPC title