US20040025261A1 - Method for the carbonization of an at least inherently stable two-dimensional textile structure - Google Patents
Method for the carbonization of an at least inherently stable two-dimensional textile structure Download PDFInfo
- Publication number
- US20040025261A1 US20040025261A1 US10/432,083 US43208303A US2004025261A1 US 20040025261 A1 US20040025261 A1 US 20040025261A1 US 43208303 A US43208303 A US 43208303A US 2004025261 A1 US2004025261 A1 US 2004025261A1
- Authority
- US
- United States
- Prior art keywords
- fabric
- recited
- preoxidized
- laser beam
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/20—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products
- D01F9/21—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F9/22—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyacrylonitriles
Definitions
- the present invention is directed to a method for carbonizing an at least inherently stable textile fabric, in which preoxidized or a mixture of preoxidized and non-oxidized fibers are combined to form a fabric, and are stiffened.
- the object of the present invention is to devise a simplified method for carbonizing at least inherently stable textile fabrics.
- the objective is achieved in accordance with the present invention in that at least inherently stable textile fabric, in which preoxidized or a mixture of preoxidized and non-oxidized fibers are combined to form a fabric, and are stiffened, are heated under the admission of air, by a laser beam, in rows or columns, to temperatures of between 600° C. and 900° C., the heating taking place with increasing process power.
- the heating may be carried out using a laser beam and in the presence of air, without the fabric being destroyed, i.e., the fibers being burned.
- the method is greatly simplified, since the need is eliminated for devices for supplying inert gas, so that the method may be continuously implemented in a simple way.
- the process power introduced by laser is between 0.01 und 0.5 watt-seconds g ⁇ 1 .
- the process power employed ensures a conversion of the output fibers into carbonized fibers without burning the same.
- the heating is preferably effected using a CO 2 laser.
- the present invention is also directed to a device for implementing the method according to the present invention, where the laser beam is moved by motor and is directed along adjoining paths in such a way over the surface of the fabric that the fabric is irradiated in all surface zones substantially consistently.
- a homogeneously carbonized fabric is obtained by using the device according to the present invention.
- the present invention is also directed to a carbonized nonwoven fabric, which is produced in accordance with the method of the present invention and has a flexural rigidity of about 8 Taber to about 1 Taber, a tensile strength (machine running direction) of 0.4 to 4 N/mm 2 and a tensile strength (transversely to the machine running direction) of 0.7 to 4 N/mm 2 , an elongation property (machine running direction) of 0.12 to 14%, an elongation property (transversely to the machine running direction) of 0.15 to 19%, as well as an air permeability at 200 Pa pressure difference of 200 to 1600 l(m 2 *s), products having a greater flexural rigidity, greater tensile strength, less elongation representing relatively rigid products having less air permeability, and the opposite limiting values of the mentioned parameters leading to products having a substantial air permeability.
- the carbonized fabric in accordance with the present invention has sufficient mechanical strength, so that the handling characteristics of the carbonized fabric are ensured
- the present invention is elucidated in the following on the basis of an example.
- a mechanically stiffened nonwoven fabric having a mass per unit area of 120 g/m 2 undergoes treatment, as indicated in Table 1.
- the laser power is successively increased in ten steps, the treatment being repeated many times, in particular at the beginning of the process at low power stages.
- the maximum laser power was 1000 W.
- the laser beam having a diameter of 14 mm was directed with a lateral scan velocity (in the crosswise direction—CD) of 4 m/s and an advance (in the machine direction—MD) of 2 mm over the nonwoven fabric.
- the weight loss in response to the carbonization using the CO 2 laser was about 50% by weight. This corresponds to the weight reduction occurring during carbonization in the high-temperature oven.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Inorganic Fibers (AREA)
- Treatment Of Fiber Materials (AREA)
- Nonwoven Fabrics (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention relates to a method for the carbonization of an at least inherently stable two-dimensional textile structure, according to which preoxidized fibers or a mixture of preoxidized and non-oxidized fibers is combined to give a two-dimensional structure and is solidified. Said two-dimensional structure is heated up to temperatures ranging from 600° C. to 900° C. line by line or column by column by means of a laser beam and while supplying air, and the temperature increases as the process output increases.
Description
- The present invention is directed to a method for carbonizing an at least inherently stable textile fabric, in which preoxidized or a mixture of preoxidized and non-oxidized fibers are combined to form a fabric, and are stiffened.
- From the Japanese Patents JP 1077624 and JP 1077625, methods are known for fabricating porous material from carbon fibers. In this context, self-binding, carbonizable short fibers, such as pitch fibers, cellulose fibers or acrylic fibers are blended and molded into paper, sheets or boards, and carbonized in an inert gas atmosphere under the action of heat.
- From the document DE 19 45 154, a method for carbonizing and graphitizing fibers is known where precursor fibers, such as polyacrylonitrile polymers or aromatic polyamides, are preoxidized by heating to a temperature of 180° C. to 550° C. in an oxygen-containing atmosphere, and are subsequently heated by a laser beam in a non-oxidized atmosphere to a temperature of between 700° C. and approximately 1,200° C., and are carbonized. For this, the yarn or non-woven fabric to be carbonized is introduced into an inert gas atmosphere. Measures of this kind make the production process more expensive and also slow it down.
- The object of the present invention is to devise a simplified method for carbonizing at least inherently stable textile fabrics.
- The objective is achieved in accordance with the present invention in that at least inherently stable textile fabric, in which preoxidized or a mixture of preoxidized and non-oxidized fibers are combined to form a fabric, and are stiffened, are heated under the admission of air, by a laser beam, in rows or columns, to temperatures of between 600° C. and 900° C., the heating taking place with increasing process power.
- Surprisingly, it was found that the heating may be carried out using a laser beam and in the presence of air, without the fabric being destroyed, i.e., the fibers being burned. As a result, the method is greatly simplified, since the need is eliminated for devices for supplying inert gas, so that the method may be continuously implemented in a simple way.
- Preferably, the process power introduced by laser is between 0.01 und 0.5 watt-seconds g−1. The process power employed ensures a conversion of the output fibers into carbonized fibers without burning the same.
- The heating is preferably effected using a CO2 laser.
- The present invention is also directed to a device for implementing the method according to the present invention, where the laser beam is moved by motor and is directed along adjoining paths in such a way over the surface of the fabric that the fabric is irradiated in all surface zones substantially consistently. A homogeneously carbonized fabric is obtained by using the device according to the present invention.
- The present invention is also directed to a carbonized nonwoven fabric, which is produced in accordance with the method of the present invention and has a flexural rigidity of about 8 Taber to about 1 Taber, a tensile strength (machine running direction) of 0.4 to 4 N/mm2 and a tensile strength (transversely to the machine running direction) of 0.7 to 4 N/mm2, an elongation property (machine running direction) of 0.12 to 14%, an elongation property (transversely to the machine running direction) of 0.15 to 19%, as well as an air permeability at 200 Pa pressure difference of 200 to 1600 l(m2*s), products having a greater flexural rigidity, greater tensile strength, less elongation representing relatively rigid products having less air permeability, and the opposite limiting values of the mentioned parameters leading to products having a substantial air permeability. The carbonized fabric in accordance with the present invention has sufficient mechanical strength, so that the handling characteristics of the carbonized fabric are ensured. In comparison to conventional methods, the rigidity of the fabric carbonized using a CO2 laser may be clearly increased, without the material becoming brittle.
- The present invention is elucidated in the following on the basis of an example.
- A mechanically stiffened nonwoven fabric having a mass per unit area of 120 g/m2 undergoes treatment, as indicated in Table 1. The laser power is successively increased in ten steps, the treatment being repeated many times, in particular at the beginning of the process at low power stages. The maximum laser power was 1000 W. The laser beam having a diameter of 14 mm was directed with a lateral scan velocity (in the crosswise direction—CD) of 4 m/s and an advance (in the machine direction—MD) of 2 mm over the nonwoven fabric. The weight loss in response to the carbonization using the CO2 laser was about 50% by weight. This corresponds to the weight reduction occurring during carbonization in the high-temperature oven.
Laser Laser Laser process Number of power power power CD Step treatments [%] [kW] [kW s g−1] 1 4× 25 0.480 0.14 2 3× 30 0.550 0.16 3 3× 35 0.630 0.19 4 1× 40 0.680 0.20 5 1× 45 0.740 0.22 6 1× 50 0.790 0.24 7 1× 55 0.830 0.25 8 1× 60 0.880 0.26 9 1× 65 0.910 0.27 10 1× 77 1.000 0.30
Claims (6)
1. A method for carbonizing an at least inherently stable textile fabric, in which preoxidized or a mixture of preoxidized and non-oxidized fibers are combined to form a fabric, and are stiffened,
wherein the textile fabric is heated under the admission of air, by a laser beam, by lines or columns, to temperatures of between 600° C. and 900° C., the heating taking place with increasing process power.
2. The method as recited in claim 1 ,
wherein the process power is varied in steps between 0.01 und 0.5 watt-seconds g−1.
3. The method as recited in claim 1 or 2,
wherein the low process powers are input repeatedly.
4. The method as recited in one of claims 1 through 3,
wherein the heating is effected using a CO2 laser.
5. The device as recited in one of claims 1 through 4,
wherein the laser beam is moved by motor and is directed along adjoining paths in such a way over the surface of the fabric that the fabric is irradiated in all surface zones substantially consistently.
6. A carbonized nonwoven fabric produced in accordance with one or more of the claims 1 through 4,
wherein it has a flexural rigidity of about 8 Taber to about 1 Taber, a tensile strength (machine running direction) of 0.4 to 4 N/mm2 and a tensile strength (transversely to the machine running direction) of 0.7 to 4 N/mm2, an elongation property of 0.12 to 14 (flexible) %, an elongation property (transverse) of 0.15 (rigid) to 19%, as well as an air permeability at 200 Pa pressure difference of 200 to 1600 l(m2*s).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10057868A DE10057868C1 (en) | 2000-11-21 | 2000-11-21 | Process for carbonizing an at least inherently strong, textile fabric |
DE10057868.3 | 2000-11-21 | ||
PCT/EP2001/008449 WO2002042532A1 (en) | 2000-11-21 | 2001-07-21 | Method for the carbonization of an at least inherently stable two-dimensional textile structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040025261A1 true US20040025261A1 (en) | 2004-02-12 |
Family
ID=7664197
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/432,083 Abandoned US20040025261A1 (en) | 2000-11-21 | 2001-07-21 | Method for the carbonization of an at least inherently stable two-dimensional textile structure |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040025261A1 (en) |
EP (1) | EP1336000A1 (en) |
JP (1) | JP2004526872A (en) |
AU (1) | AU2001289718A1 (en) |
DE (1) | DE10057868C1 (en) |
WO (1) | WO2002042532A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116084060A (en) * | 2023-03-10 | 2023-05-09 | 长春理工大学中山研究院 | Polyacrylonitrile-based carbon fiber laser preoxidation method and device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3699210A (en) * | 1968-09-06 | 1972-10-17 | Monsanto Res Corp | Method of graphitizing fibers |
US4370141A (en) * | 1981-05-18 | 1983-01-25 | Celanese Corporation | Process for the thermal stabilization of acrylic fibers |
US5066433A (en) * | 1988-02-16 | 1991-11-19 | Hercules Incorporated | Method of manufacturing carbon fiber using preliminary stretch |
USH1052H (en) * | 1989-06-30 | 1992-05-05 | Method for stabilization of pan-based carbon fibers | |
US5256344A (en) * | 1989-02-23 | 1993-10-26 | Hercules Incorporated | Process of thermally stabilizing pan fibers |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6477624A (en) * | 1987-09-16 | 1989-03-23 | Toray Industries | Production of porous material made of carbon fiber |
JPS6477625A (en) * | 1987-09-16 | 1989-03-23 | Toray Industries | Production of porous carbon fiber |
-
2000
- 2000-11-21 DE DE10057868A patent/DE10057868C1/en not_active Expired - Fee Related
-
2001
- 2001-07-21 EP EP01969466A patent/EP1336000A1/en not_active Withdrawn
- 2001-07-21 AU AU2001289718A patent/AU2001289718A1/en not_active Abandoned
- 2001-07-21 JP JP2002545228A patent/JP2004526872A/en active Pending
- 2001-07-21 WO PCT/EP2001/008449 patent/WO2002042532A1/en not_active Application Discontinuation
- 2001-07-21 US US10/432,083 patent/US20040025261A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3699210A (en) * | 1968-09-06 | 1972-10-17 | Monsanto Res Corp | Method of graphitizing fibers |
US4370141A (en) * | 1981-05-18 | 1983-01-25 | Celanese Corporation | Process for the thermal stabilization of acrylic fibers |
US5066433A (en) * | 1988-02-16 | 1991-11-19 | Hercules Incorporated | Method of manufacturing carbon fiber using preliminary stretch |
US5256344A (en) * | 1989-02-23 | 1993-10-26 | Hercules Incorporated | Process of thermally stabilizing pan fibers |
USH1052H (en) * | 1989-06-30 | 1992-05-05 | Method for stabilization of pan-based carbon fibers |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116084060A (en) * | 2023-03-10 | 2023-05-09 | 长春理工大学中山研究院 | Polyacrylonitrile-based carbon fiber laser preoxidation method and device |
Also Published As
Publication number | Publication date |
---|---|
EP1336000A1 (en) | 2003-08-20 |
AU2001289718A1 (en) | 2002-06-03 |
JP2004526872A (en) | 2004-09-02 |
DE10057868C1 (en) | 2002-06-13 |
WO2002042532A1 (en) | 2002-05-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CARL FREUDENBERG KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SEVERICH, BIRGIT;SCHOEPPING, GERHARD;REEL/FRAME:014591/0691;SIGNING DATES FROM 20030311 TO 20030316 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |