GB856488A - Improvements in or relating to the manufacture of composite glass tubing - Google Patents

Improvements in or relating to the manufacture of composite glass tubing

Info

Publication number
GB856488A
GB856488A GB2230358A GB2230358A GB856488A GB 856488 A GB856488 A GB 856488A GB 2230358 A GB2230358 A GB 2230358A GB 2230358 A GB2230358 A GB 2230358A GB 856488 A GB856488 A GB 856488A
Authority
GB
United Kingdom
Prior art keywords
tube
glass
coating
flames
heating
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
GB2230358A
Inventor
Michael Anthony Chadwic Heanly
Edward Ernest Miles
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2230358A priority Critical patent/GB856488A/en
Publication of GB856488A publication Critical patent/GB856488A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/02—Surface treatment of glass, not in the form of fibres or filaments, by coating with glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Glass Compositions (AREA)

Abstract

856,488. Glass manufacture, enamels and enamalling. GENERAL ELECTRIC CO. Ltd. May 20, 1959 [July 11, 1958], No. 22303/58. Class 56. The process of applying to the internal surface of a cylindrical tube of a fusi glass, a layer of a second glass of lower melting temperature includes the steps of coating the internal surface with a powdered second glass or enamel in a volatile suspending medium, heating the tube to remove the volatile constituents, rotating the tube while applying to the external surface at regions spaced apart along the length of the tube sufficient localised heat to fuse the powdered coating in circumferential regions of the tube and varying the regions of application of the heat axially along the tube until the whole of the powdered coating is fused, the heating, the width and spacing thereof and the rate of axial variation being such that the parts of the tube between the heated parts at any time remain sufficiently rigid to maintain the shape of the tube. The tube 1 is rotated and heated by resting a pair of rotating steel rollers 2, 3, heated from below by gas flames 4 and a current of air, passed through the tube to carry off the volatile constituents. A row of fine painted gas flames 5 are then lit, the flames being about half an inch apart and heating a zone 6 about 4 mm. wide. At intervals of about one minute the flames 5 are moved along the axis of the tube by about 4 mm. until the whole coating is fused. The process may be repeated several times to give a final inner coating of about 0.03 mm. thickness. For a sodium vapour discharge lamp of soda lime glass of composition SiO 2 70À12 Al 2 O 3 2À58; CaO 5À40; MgO 3À60; Na2O 16À82; K 2 O 0À35; B 2 O 3 0À78; SO 3 0À20, all in weight percentages, a coating of a sodium-resistant glass or enamel of the following composition is used SiO 2 8À0; Al 2 O 3 24À0; CaO 6À0; Na 2 O 14.0; B 2 O 3 48À0; Fe 2 O 3 0.01, the powder being milled in a solution of nitrocellulose in butyl acetate.
GB2230358A 1958-07-11 1958-07-11 Improvements in or relating to the manufacture of composite glass tubing Expired GB856488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2230358A GB856488A (en) 1958-07-11 1958-07-11 Improvements in or relating to the manufacture of composite glass tubing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2230358A GB856488A (en) 1958-07-11 1958-07-11 Improvements in or relating to the manufacture of composite glass tubing

Publications (1)

Publication Number Publication Date
GB856488A true GB856488A (en) 1960-12-14

Family

ID=10177201

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2230358A Expired GB856488A (en) 1958-07-11 1958-07-11 Improvements in or relating to the manufacture of composite glass tubing

Country Status (1)

Country Link
GB (1) GB856488A (en)

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