GB1223805A - Glass tube manufacture - Google Patents

Glass tube manufacture

Info

Publication number
GB1223805A
GB1223805A GB2716269A GB2716269A GB1223805A GB 1223805 A GB1223805 A GB 1223805A GB 2716269 A GB2716269 A GB 2716269A GB 2716269 A GB2716269 A GB 2716269A GB 1223805 A GB1223805 A GB 1223805A
Authority
GB
United Kingdom
Prior art keywords
glass
tube
composition
fibre
temperature
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
GB2716269A
Inventor
Alec Harley Reeves
Cyril Francis Drake
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2716269A priority Critical patent/GB1223805A/en
Priority to DE19702025921 priority patent/DE2025921A1/en
Priority to FR7019527A priority patent/FR2043777B3/fr
Publication of GB1223805A publication Critical patent/GB1223805A/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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/01228—Removal of preform material
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/02—Forming molten glass coated with coloured layers; Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts
    • C03B17/025—Tubes or rods
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
    • C03B37/01245—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down by drawing and collapsing
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01265—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt
    • C03B37/01268—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt by casting
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01265—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt
    • C03B37/01274—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt by extrusion or drawing
    • 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
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/12—Drawing solid optical fibre directly from a hollow preform
    • C03B2205/16—Drawing solid optical fibre directly from a hollow preform the drawn fibre consisting of circularly symmetric core and clad

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Glass Compositions (AREA)

Abstract

1,223,805. Glass tube manufacture; glass fibres. STANDARD TELEPHONES & CABLES Ltd. 29 May, 1969, No. 27162/69. Heading C1M. A hollow open-ended cylinder of glass having a radially graded composition is made by causing molten glass 5 to flow under gravity at a controlled rate down the interior wall of an open-ended tube 2 which rate is determined in relation with a variation with time of the glass composition and of the temperature of the tube 2 so that a succession of substantially uniform thickness layers 6 of solidified glass are built up on the wall. The crucible 1 is heated at 3 and tube 2 at 4 and the glass 5 is flowed over the top of tube 2 to form layer 6 while excess glass 7 flows out at 8. Fresh layers are built up by changing the composition and the required temperature of tube 2 to give discrete layers or alternatively the composition and temperature may be changed continuously. The tube of glass is then removed, preferably by dissolving off the tube 2, and heated and pulled to form a rod and thence a fibre into graded composition. The graded fibre is particularly for fibre optics with refractive index increasing towards the centre. Suggested glasses therefor are initially, in weight percentages: Na 2 O 15; CaO 10; SiO 2 75 which is gradually changed to Na 2 O 20; CaO 10; SiO 2 70 giving the centre with increased refractive index.
GB2716269A 1969-05-29 1969-05-29 Glass tube manufacture Expired GB1223805A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2716269A GB1223805A (en) 1969-05-29 1969-05-29 Glass tube manufacture
DE19702025921 DE2025921A1 (en) 1969-05-29 1970-05-27 Apparatus for making a glass tube of radially graded composition
FR7019527A FR2043777B3 (en) 1969-05-29 1970-05-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2716269A GB1223805A (en) 1969-05-29 1969-05-29 Glass tube manufacture

Publications (1)

Publication Number Publication Date
GB1223805A true GB1223805A (en) 1971-03-03

Family

ID=10255212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2716269A Expired GB1223805A (en) 1969-05-29 1969-05-29 Glass tube manufacture

Country Status (3)

Country Link
DE (1) DE2025921A1 (en)
FR (1) FR2043777B3 (en)
GB (1) GB1223805A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2088486A1 (en) * 1970-05-11 1972-01-07 Corning Glass Works
FR2160949A1 (en) * 1971-11-25 1973-07-06 Siemens Ag
EP0017742A1 (en) * 1979-03-09 1980-10-29 Siemens Aktiengesellschaft Method for fabricating a multiple-core optical fiber
EP0249886A1 (en) * 1986-06-19 1987-12-23 3M Fiber Optic Products, Inc. Method of manufacturing hollow core optical fibers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737293A (en) * 1972-01-03 1973-06-05 Corning Glass Works Method of forming an economic optical waveguide fiber
US3826560A (en) * 1972-03-30 1974-07-30 Corning Glass Works Method of forming a light focusing fiber waveguide
JPS4983453A (en) * 1972-12-14 1974-08-10
FR2487811B1 (en) * 1980-07-31 1985-07-26 France Etat PROCESS AND PLANT FOR CONTINUOUSLY MANUFACTURING OPTICAL FIBERS

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2088486A1 (en) * 1970-05-11 1972-01-07 Corning Glass Works
FR2160949A1 (en) * 1971-11-25 1973-07-06 Siemens Ag
EP0017742A1 (en) * 1979-03-09 1980-10-29 Siemens Aktiengesellschaft Method for fabricating a multiple-core optical fiber
EP0249886A1 (en) * 1986-06-19 1987-12-23 3M Fiber Optic Products, Inc. Method of manufacturing hollow core optical fibers

Also Published As

Publication number Publication date
DE2025921A1 (en) 1970-12-03
FR2043777A7 (en) 1971-02-19
FR2043777B3 (en) 1973-03-16

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