Carbon fiber carbonization apparatus using microwave

Patent metadata

Field	Value
Publication number	US-11459673-B2
Application number	US-201917047830-A
Country	US
Kind code	B2
Filing date	Jul 22, 2019
Priority date	Jul 23, 2018
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

The present invention relates to a carbon fiber carbonization apparatus using a microwave. The carbon fiber carbonization apparatus using a microwave comprises: a carbonization furnace into which the microwave is irradiated from an irradiation part disposed at one side thereof; a moving tube through which a carbon fiber moves along the inside thereof and which is mounted to pass through the carbonization furnace; and a heating element coupled to an outer circumferential surface of the moving tube to absorb the microwave so as to generate heat. A portion of the moving tube is covered by the heating element at the position, but a remaining portion is exposed at a position at which the heating element is coupled to the moving tube.

First claim

The invention claimed is:

1. A carbon fiber carbonization apparatus using a microwave, comprising:
a carbonization furnace in which a carbon fiber is carbonized;
a moving tube which passes through the carbonization furnace and through which the carbon fiber moves;
a heating element disposed inside the carbonization furnace, the heating element being disposed outside the moving tube, wherein the heating element is open in a direction in which the microwave is irradiated so that the carbon fiber is directly exposed to and irradiated by the microwave, and wherein the heating element occupies 1.7% or less of an internal volume of the carbonization furnace; and
an irradiation part configured to irradiate the microwave into the carbonization furnace,
wherein the heating element has a structure of which one side is opened.

2. The carbon fiber carbonization apparatus of claim 1 , wherein the heating element has a hexahedral shape,
corresponding surfaces of the heating element are penetrated by the moving tube, and
the moving tube is surrounded by three surfaces of the heating element.

3. The carbon fiber carbonization apparatus of claim 1 , wherein the heating element has a length of 1 cm to 7 cm in a direction in which the carbon fiber moves.

4. The carbon fiber carbonization apparatus of claim 1 , wherein the inside of the carbonization furnace has an inert gas atmosphere.

5. The carbon fiber carbonization apparatus of claim 1 , wherein the irradiation part comprises a waveguide through which the microwave moves, wherein the waveguide is connected to one side of the carbonization furnace.

6. The carbon fiber carbonization apparatus of claim 1 , wherein the moving tube is made of quartz.

7. The carbon fiber carbonization apparatus of claim 6 , wherein the moving tube made of the quartz has a loss tangent of less than 0.0003.

8. The carbon fiber carbonization apparatus of claim 1 , wherein a cross-sectional area of the moving tube is equal to or less than 5.9% of a cross-sectional area of the carbonization furnace.

9. The carbon fiber carbonization apparatus of claim 4 , wherein nitrogen is injected into the moving tube to generate the inert gas atmosphere.

10. The carbon fiber carbonization apparatus of claim 1 , wherein the heating element has a U-shaped groove defining an interior surface.

Assignees

• Lg Chemical Ltd

Inventors

• Shin Ji Hye
• Park Tae Eon
• Kim Su Jin
• Kim Ki Hwan
• Lee Ii Ha
• Lee Jun Young

Classifications

• D01F9/32 Primary

  Apparatus therefor · CPC title

• D06M10/003

  Treatment with radio-waves or microwaves · CPC title

• D06M10/00

  Physical treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, e.g. by ultrasonic waves, corona discharge, irradiation, electric currents or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements · CPC title

• B01J19/126

  Microwaves · CPC title