GB2228892A - Filaments and hot gas filter - Google Patents
Filaments and hot gas filter Download PDFInfo
- Publication number
- GB2228892A GB2228892A GB8905085A GB8905085A GB2228892A GB 2228892 A GB2228892 A GB 2228892A GB 8905085 A GB8905085 A GB 8905085A GB 8905085 A GB8905085 A GB 8905085A GB 2228892 A GB2228892 A GB 2228892A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filaments
- polymer
- conductive filler
- electrically conductive
- polyether
- 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.)
- Withdrawn
Links
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
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/09—Addition of substances to the spinning solution or to the melt for making electroconductive or anti-static filaments
-
- 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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Filtering Materials (AREA)
- Woven Fabrics (AREA)
Description
1 FILAMENTS This invention relates to filaments and fabrics suitable for
use in high temperature filtration, especially the filtration of hot gases to remove solid particulate 5 matter.
There may be an explosion risk in the filtration of hot gases either because the gas is explosive in itself or because of a high dust level in the gas. The gas may be derived from a high temperature chemical process or from heating apparatus, for example power station boilers, where the hot gas is filtered to remove fly ash.
Filaments according to the invention are melt-spun filaments of a polymer capable of retaining its strength at a temperature of 1700C and are characterised in that the filaments contain 5 to 25% by volume of an electrically conductive filler.
A filter according to the invention for hot gases is formed from filaments of a polymer capable of retaining its strength at a temperature of 1700C and containing 5 to 25% by volume of an electrically conductive filler.
The polymer from which the filaments are formed is preferably a polyether ether ketone, for example that sold by ICI plc as PEEK, a polyether imide, for example that sold under the trademark "Ultem", a polyether ketone, a polyether sulphone, a polyphenylene sulphide or a liquid crystal aromatic pol.yester, for example that sold under the trademark "Vectra". The maximum temperature of continuous use of these polymers, i.e. the maximum temperature at which they retain their strength, is generally in the range 170 to 2700C.
The electrically conductive filler is preferably carbon black used at 10 to 40% by weight, preferably 20 to R 2 33% by weight. The particle size of the carbon black is preferably in the range 0.5 to 10 nm. Other particulate conductive materials such as metal powders can be used as filler. The use of an electroconductive filler reduces 5 the risk of a spark giving rise to an explosion.
Polyether ether ketones containing electroconductive filler can be meltspun at a temperature of 380 to 4300C as described in Disclosures Nos. 216001 and 216002 in the magazine "Research Disclosures". Polyether imides can be melt-spun at a temperature of 360 to 4400C. Polyether ketones can be melt- spun at a temperature of 420 to 5000C. Polyether sulphones can be melt- spun as described in US patent 3373720. Polyphenylene sulphides can be melt-spun as described in British Patent 1420176. "Vectra" liquid aromatic polyester can be melt-spun at a temperature of 280 to 3400C. The filled polymers can be melt-spun using the apparatus described in published European patent application No. 298,767, particularly if they contain 10% or more by volume of the filler.
The filaments are preferably of non-circular cross section, for example trilobal Y-shaped and other multilobal filaments. Such multilobal cross-section fibres have improved filtration efficiency. They can be formed by extrusion through a spinnerette having appropriately shaped orifices.
The filaments can be bicomponent filaments, for example with a sheath of polyether ether ketone, which has very good chemical and heat resistance, and a core of a less-expensive heat-resistant polymer such as polyether imide. The sheath of a core/sheath bicomponent yarn should contain conductive filler in the amount specified. The core may or may not contain conductive filler. Similarly a polyether ether ketone coating can be applied to a fibre of another temperature-resistant polymer. In this case both- core fibre and coating preferably contain conductive 1 t Al 3 f i l ler.
The filter can be in the form of a woven, knitted or non-woven fabric and can be formed from continuous fila- ments or staple fibres. Examples of non-woven fabrics are air-laid, water-laid, needle-felted, spun-bonded and hydroentangled fabrics. The filaments containing electri cally conductive filler need not be the only fibres or filaments in the fabrics, for example a wove.n fabric can include yarns which do not contain conductive filler or a non-woven fabric can contain filaments or fibres which do not contain conductive filler. Such non-conductive yarns, fibres or filaments used in the filters of this invention will generally also be formed of a polymer capable of retaining its strength at a temperature of 1700C, for example the polymers described above.
r 4
Claims (11)
1. Melt-spun filaments of a polymer capable of retaining its strength at a temperature of 1700C, characterised in that the filaments contain 5 to 25% by volume of an electrically conductive filler.
2. Filaments according to claim 1, characterised in that the polymer is a polyether etherketone.
3. Filaments according to claim 1, characterised in that the polymer is a polyether imide.
4. Filaments according to claim 1, characterised in that the polymer is a polyether ketone.
5. Filaments according to claim 1, characterised in that the polymer is a polyether sulphone.
6. Filaments according to claim 1, characterised in that the polymer is a polyphenylene sulphide.
7. Filaments according to claim 1, characterised in that the polymer is a liquid crystal aromatic polyester.
8. Filaments according to claim 1, characterised in that the filaments are core/sheath bicomponent filaments in which the sheath contains electrically conductive filler.
9. Filaments according to any of claims 1 to 8, characterised in that the electrically conductive filler is carbon black.
10. A filter for hot gases formed from filaments of a polymer capable of retaining its strength at a temperature of 1700C, and containing 5 to 25% by volume of an electrically conductive filler.
v 9 -41
11. A filter according to claim 10, characterised in that the filter is a fabric formed from a mixture of the said filaments containing electrically conductive filler and filaments of a polymer capable of retaining its strength at a temperature of 1700C which do not contain conductive filler.
Published 1990 at The Patent Office. State House. 8671 High Ho]born. IondonWClR4TP PLirther copies maybe obtained from The Patent Office SiLles Branch, St Mary Cray. Orpington, Kent BR5 3RD. Printed by Multiplex techniques ItcL St Mary Cray, Kent, Con. V87
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8905085A GB2228892A (en) | 1989-03-06 | 1989-03-06 | Filaments and hot gas filter |
| EP19900302311 EP0386975A3 (en) | 1989-03-06 | 1990-03-05 | Filaments and hot gas filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8905085A GB2228892A (en) | 1989-03-06 | 1989-03-06 | Filaments and hot gas filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8905085D0 GB8905085D0 (en) | 1989-04-19 |
| GB2228892A true GB2228892A (en) | 1990-09-12 |
Family
ID=10652825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8905085A Withdrawn GB2228892A (en) | 1989-03-06 | 1989-03-06 | Filaments and hot gas filter |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0386975A3 (en) |
| GB (1) | GB2228892A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2004202196A1 (en) * | 2004-05-21 | 2005-12-08 | Melbatex Pty Ltd | Fabric construction |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1278533C (en) * | 1989-08-22 | 1991-01-02 | E. Lee Noddin | Polyimide composite filter fabrics |
| US5482773A (en) * | 1991-07-01 | 1996-01-09 | E. I. Du Pont De Nemours And Company | Activated carbon-containing fibrids |
| IL102338A (en) * | 1991-07-01 | 1996-11-14 | Du Pont | Polymeric febrids containing activated carbon |
| US5229200A (en) * | 1991-12-18 | 1993-07-20 | W. L. Gore & Associates, Inc. | Static dissipative nonwoven textile material |
| US5527569A (en) * | 1994-08-22 | 1996-06-18 | W. L. Gore & Associates, Inc. | Conductive filter laminate |
| US6989194B2 (en) * | 2002-12-30 | 2006-01-24 | E. I. Du Pont De Nemours And Company | Flame retardant fabric |
| US7485592B2 (en) | 2006-09-13 | 2009-02-03 | E.I. Du Pont De Nemours And Company | Bag filter comprising polyphenylene sulfide and acrylic fiber |
| CN101680130B (en) * | 2007-06-07 | 2012-10-10 | 阿尔巴尼国际公司 | Conductive monofilament and fabric |
| US7998577B2 (en) * | 2007-12-13 | 2011-08-16 | E. I. Du Pont De Nemours And Company | Multicomponent fiber with polyarylene sulfide component |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2001901A (en) * | 1977-08-08 | 1979-02-14 | Kanebo Ltd | Conductive composite filaments |
| GB2003084A (en) * | 1977-07-07 | 1979-03-07 | Bayer Ag | Fibre and filament mixtures containing high-shrinkage bifilar poly(mod)acrylic filaments or fibres with carbon black |
| GB2036638A (en) * | 1978-11-23 | 1980-07-02 | Akzo Nv | Anti-static conjugate fibre structure |
| GB2077182A (en) * | 1980-06-06 | 1981-12-16 | Kanebo Ltd | Conductive composite filaments |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE790254A (en) * | 1971-10-18 | 1973-04-18 | Ici Ltd | CONDUCTIVE TEXTILE MATERIALS |
| JPS52151393A (en) * | 1976-06-11 | 1977-12-15 | Toyobo Co Ltd | Poly-(n-ethylenetrimellitateimide) fiber or film its preparation |
| JPS6392724A (en) * | 1986-09-30 | 1988-04-23 | Kuraray Co Ltd | Composite fiber having excellent heat-resistance, chemical resistance and antistaticity |
| JPH0714625B2 (en) * | 1987-03-30 | 1995-02-22 | 呉羽化学工業株式会社 | Highly crystallized polyarylenthi ether molded product |
-
1989
- 1989-03-06 GB GB8905085A patent/GB2228892A/en not_active Withdrawn
-
1990
- 1990-03-05 EP EP19900302311 patent/EP0386975A3/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2003084A (en) * | 1977-07-07 | 1979-03-07 | Bayer Ag | Fibre and filament mixtures containing high-shrinkage bifilar poly(mod)acrylic filaments or fibres with carbon black |
| GB2001901A (en) * | 1977-08-08 | 1979-02-14 | Kanebo Ltd | Conductive composite filaments |
| GB2036638A (en) * | 1978-11-23 | 1980-07-02 | Akzo Nv | Anti-static conjugate fibre structure |
| GB2077182A (en) * | 1980-06-06 | 1981-12-16 | Kanebo Ltd | Conductive composite filaments |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2004202196A1 (en) * | 2004-05-21 | 2005-12-08 | Melbatex Pty Ltd | Fabric construction |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0386975A2 (en) | 1990-09-12 |
| GB8905085D0 (en) | 1989-04-19 |
| EP0386975A3 (en) | 1990-10-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |