WO1991012702A1 - Radiofrequency heating of thin filaments - Google Patents
Radiofrequency heating of thin filaments Download PDFInfo
- Publication number
- WO1991012702A1 WO1991012702A1 PCT/GB1991/000189 GB9100189W WO9112702A1 WO 1991012702 A1 WO1991012702 A1 WO 1991012702A1 GB 9100189 W GB9100189 W GB 9100189W WO 9112702 A1 WO9112702 A1 WO 9112702A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radiofrequency
- filament
- heating apparatus
- source
- modulation
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the invention relates to the manufacture and or processing of filamentary material and in particular to heating of filaments by remote contactless means.
- the object of the invention is to provide a novel non-contacting filament heating arrangement which can be used over long lengths of filament and assembled to a heating chamber in a convenient manner.
- the invention provides a radiofrequency heating apparatus for heating thin electrically conductive filaments comprising a means to linearly support a length of filament, characterised in that there are provided:
- SUBSTITUTE SHEET a coil, earthed at one end, located adjacent to the filament; a source of radio frequency signals in the frequency range from H.F. to U.H.F. connected to the coil; and a conducting element connected to the non-earthed end of the coil and arranged to form or lie adjacent to the filament whereby the heating of the filament occurs within the cylindrical conducting element; characterised in that: the source of radio frequency signals is amplitude modulated.
- the conducting element is so formed as to lie on the surface of a cylinder through which the filament passes coaxially.
- the apparatus includes a cylindrical enclosure through which the wire is drawn and the conducting element is helically wound around the enclosure.
- the amplitude modulation may be at audio frequencies, using double or single sideband modulation. It has been found that uniform heating of filaments or wires by this contactless heatinf apparatus can be ensured by modulation of the RF source.
- SUBSTITUTE SHEET through a cylindrical heating enclosure 11 from a take-off spool (not shown) to a take-up spool (not shown) .
- the filament 10 is drawn axially through the cylindrical enclosure 11 which may be made of glass.
- a 13-56 MHz radio frequency source 12 is connected via a variable capacitor 13 to one end 14 of an earthed coil 15-
- the coil 15 is made of copper tubing through which cooling water is passed and is formed with eight turns of diameter 5cm and an overall length of about 5cm.
- the variable capacitor 13 is adjusted to tune the arrangement to the RF supply frequency of 13- 6 MHz.
- An electrical connection is also provided connecting the end 14 of the coil 15 to a conducting wire element 16, helically wound around the glass cylinder 11.
- a shortwave transmitter or other suitable RF generator 12 may be used.
- SUBSTITUTE SHEET improved heating in some circumstances. Heating of the filament according to the present invention occurs only within the helix.
- a standard type of commercially available shortwave 2 kW output can be used.
- the helical aerial shown in the Figure other shapes of aerial can be used.
- An advantage of the helix is that it can be stretched out (i.e. fewer turns per inch) locally to give a locally cooler region, or locally compressed to give a locally hotter region.
- the wire element Although described in relation to a helical wire element wrapped around the cylindrical heating vessel it is possible for the wire element to be formed as a printed circuit arrangement on the outer surface of the vessel. The path of the conducting element could then be made to differ from a simple helical form while retaining the overall cylindrical form.
- a cylindrical copper aerial, cut axially to allow viewing, has been found to give excellent results.
- grounded resistors may be connected to one or both ends of the heated filament at points remote from the aerial (heated) region.
- the heating apparatus described above can be used for chemical vapour deposition onto a core filament, wire annealing, etc.
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- General Induction Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909002947A GB9002947D0 (en) | 1990-02-09 | 1990-02-09 | Radio-frequency heating of thin filaments |
GB9002947.1 | 1990-02-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991012702A1 true WO1991012702A1 (en) | 1991-08-22 |
Family
ID=10670714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/000189 WO1991012702A1 (en) | 1990-02-09 | 1991-02-06 | Radiofrequency heating of thin filaments |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0514448A1 (en) |
JP (1) | JPH05504231A (en) |
AU (1) | AU7246991A (en) |
CA (1) | CA2074185A1 (en) |
GB (1) | GB9002947D0 (en) |
WO (1) | WO1991012702A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2021901A1 (en) * | 1969-05-05 | 1970-11-19 | Gen Electric | High frequency induction heating system |
US4309586A (en) * | 1978-09-27 | 1982-01-05 | Toyo Seikan Kaisha, Ltd. | High frequency induction heating circuit |
WO1989011770A1 (en) * | 1988-05-19 | 1989-11-30 | The Secretary Of State For Defence In Her Britanni | Contactless heating of thin filaments |
-
1990
- 1990-02-09 GB GB909002947A patent/GB9002947D0/en active Pending
-
1991
- 1991-02-06 JP JP3504251A patent/JPH05504231A/en active Pending
- 1991-02-06 WO PCT/GB1991/000189 patent/WO1991012702A1/en not_active Application Discontinuation
- 1991-02-06 CA CA002074185A patent/CA2074185A1/en not_active Abandoned
- 1991-02-06 EP EP91904058A patent/EP0514448A1/en not_active Withdrawn
- 1991-02-06 AU AU72469/91A patent/AU7246991A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2021901A1 (en) * | 1969-05-05 | 1970-11-19 | Gen Electric | High frequency induction heating system |
US4309586A (en) * | 1978-09-27 | 1982-01-05 | Toyo Seikan Kaisha, Ltd. | High frequency induction heating circuit |
WO1989011770A1 (en) * | 1988-05-19 | 1989-11-30 | The Secretary Of State For Defence In Her Britanni | Contactless heating of thin filaments |
Also Published As
Publication number | Publication date |
---|---|
EP0514448A1 (en) | 1992-11-25 |
AU7246991A (en) | 1991-09-03 |
CA2074185A1 (en) | 1991-08-10 |
GB9002947D0 (en) | 1990-04-04 |
JPH05504231A (en) | 1993-07-01 |
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