GB1280463A - Anti-convection head for a glass-fibre drawing furnace - Google Patents

Anti-convection head for a glass-fibre drawing furnace

Info

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
Application number
GB4529868A
Inventor
George Archer Clark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Post Office
Original Assignee
Post Office
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Post Office filed Critical Post Office
Priority to GB4529868A priority Critical patent/GB1280463A/en
Publication of GB1280463A publication Critical patent/GB1280463A/en
Expired legal-status Critical Current

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.
GB4529868A 1968-09-24 1968-09-24 Anti-convection head for a glass-fibre drawing furnace Expired GB1280463A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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