GB1280463A - Anti-convection head for a glass-fibre drawing furnace - Google Patents
Anti-convection head for a glass-fibre drawing furnaceInfo
- Publication number
- GB1280463A GB1280463A GB4529868A GB4529868A GB1280463A GB 1280463 A GB1280463 A GB 1280463A GB 4529868 A GB4529868 A GB 4529868A GB 4529868 A GB4529868 A GB 4529868A GB 1280463 A GB1280463 A GB 1280463A
- Authority
- GB
- United Kingdom
- Prior art keywords
- furnace
- head
- gas
- glass
- flow
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/029—Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/80—Means for sealing the preform entry or upper end of the furnace
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
1280463 Drawing glass fibres POST OFFICE 2 July 1969 [24 Sept 1968] 45298/68 Heading C1M [Also in Division F4] In a vertically mounted glass fibre drawing furnace 3 the formation of convection currents, due to the escape of hot gases from the top of the furnace at the entry point of a glass rod 8, is eliminated by the provision of a cylindrical head 1 which surrounds the rod 8 and is supplied with a control gas through a horizontal inlet tube 9. The flow of control gas which is downwards, counterbalances the upward flow of hot gases. The flow rate of the gas is adjusted in dependence of the temperature indicated by a thermocouple located in the hot zone of the furnace, the thermocouple giving a maximum reading when the condition of balance is achieved. The type of gas fed to the head is chosen to provide a suitable atmosphere in the hot zone of the furnace. The head is positioned to cover the exit 5 of the central furnace tube 4. The diameter of the glass rod 8 is slightly less than that of the aperture 6 and surrounding sleeve 7 thereby providing a high resistance to gas flow from the interior of the head 1 to the external atmosphere.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4529868A GB1280463A (en) | 1968-09-24 | 1968-09-24 | Anti-convection head for a glass-fibre drawing furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4529868A GB1280463A (en) | 1968-09-24 | 1968-09-24 | Anti-convection head for a glass-fibre drawing furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1280463A true GB1280463A (en) | 1972-07-05 |
Family
ID=10436679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4529868A Expired GB1280463A (en) | 1968-09-24 | 1968-09-24 | Anti-convection head for a glass-fibre drawing furnace |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1280463A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2739374A1 (en) * | 1995-09-29 | 1997-04-04 | Samsung Electronics Co Ltd | Optical fibre spinning furnace - having inlet and outlet apertures, heater for optical fibre preform, means for establishing inert gas flow within furnace, and inlet sleeve in which inlet aperture is formed and having inner surface projections and/or indentations |
WO2000050351A1 (en) * | 1999-02-26 | 2000-08-31 | Corning Incorporated | Method and apparatus for sealing the top of a furnace for drawing optical fibre from a preform |
-
1968
- 1968-09-24 GB GB4529868A patent/GB1280463A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2739374A1 (en) * | 1995-09-29 | 1997-04-04 | Samsung Electronics Co Ltd | Optical fibre spinning furnace - having inlet and outlet apertures, heater for optical fibre preform, means for establishing inert gas flow within furnace, and inlet sleeve in which inlet aperture is formed and having inner surface projections and/or indentations |
WO2000050351A1 (en) * | 1999-02-26 | 2000-08-31 | Corning Incorporated | Method and apparatus for sealing the top of a furnace for drawing optical fibre from a preform |
US6381990B1 (en) | 1999-02-26 | 2002-05-07 | Corning Incorporated | Draw furnace sealing assembly and method |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |