Textiles and methods and systems for producing textiles

Patent metadata

Field	Value
Publication number	US-9587349-B2
Application number	US-201414557170-A
Country	US
Kind code	B2
Filing date	Dec 1, 2014
Priority date	Apr 30, 2008
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

Textiles are provided that include fibrous cellulosic materials having an α-cellulose content of less than about 93%, the fibrous materials being spun, woven, knitted, or entangled. The fibrous cellulosic materials can be irradiated with a dose of ionizing radiation that is sufficient to increase the molecular weight of the cellulosic materials without causing significant depolymerization of the cellulosic materials. Methods of treating textiles that include irradiating the textiles are also provided.

First claim

What is claimed is:

1. A method of treating a textile, the method comprising:
irradiating a textile comprising a fibrous cellulosic material;
quenching the irradiated textile by applying pressure to the textile by mechanically compressing the textile in at least two dimensions at a pressure of at least 1000 psi, together with a sufficient quantity of beat to elevate the temperature of the textile to above a melting point or softening point of a component of the textile; and
irradiating the quenched textile a second time with a second dose of ionizing radiation;
wherein the fibrous cellulosic material has an alpha-cellulose content of less than about 80 percent, is selected from the group consisting of flax, hemp, jute, abaca, sisal, wheat straw, lignocellulose filler (LF), ramie, bamboo fibers, cuprammonium cellulose, regenerated wood cellulose, lyocell, cellulose acetate, and blends thereof, and is spun, woven, knitted or entangled.

2. The method of claim 1 , where each dose of ionizing radiation is at least 0.10 Mrad of ionizing electron beam radiation.

3. The method of claim 2 , where each dose of ionizing radiation is from 0.25 to 2.5 Mrad.

4. The method of claim 1 , wherein quenching further comprises quenching in the presence of a gas selected to react with radicals present, in the irradiated textile.

5. The method of claim 1 , further comprising quenching the irradiated textile a second time.

6. The method of claim 4 , wherein the gas is selected from the group consisting of: nitrogen, oxygen, acetylene, acetylene in nitrogen, ethylene, chlorinated ethylenes, propylene, or mixture thereof.

7. The method of claim 4 , wherein irradiating followed by quenching provides the material with functional groups.

8. The method of claim 7 , wherein the functional groups comprise one or more of: aldehyde groups, enol groups, nitroso groups, nitrile groups, nitro groups, ketone groups, amino groups, alkyl amino groups, alkyl groups, chloroalkyl groups, chlorofluoroalkyl groups, and/or carboxylic acid groups.

9. The method of claim 1 , wherein after quenching, the radicals are at a level not detectable with an electron spin resonance spectrometer.

10. The method of claim 1 , further comprising dying, sizing or coating the textile.

11. The method of claim 1 , wherein quenching is conducted under conditions that alter the charge density of the textile, and the method further comprises using the textile to make a filter.

12. The method claim 1 , wherein the resulting textile has one or more of: increased moisture regain, work recovery, and decomposition temperature.

13. The method of claim 2 wherein electrons in the electron beam have an energy of at least 0.25 MeV.

14. The method of claim 13 wherein electrons in the electron beam have an energy of between 0.25 MeV and 7.2 MeV.

Assignees

• Xyleco Inc

Inventors

• Medoff Marshall

Classifications

• H01J2237/303

  Electron or ion optical systems · CPC title

• D06M2101/04

  Vegetal fibres · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• D06M10/001

  Treatment with visible light, infrared or ultraviolet, X-rays · CPC title

• D04H1/42

  characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece · CPC title