GB822160A - Improvements in or relating to the manufacture of luminescent screens for cathode ray tubes - Google Patents

Improvements in or relating to the manufacture of luminescent screens for cathode ray tubes

Info

Publication number
GB822160A
GB822160A GB1968655A GB1968655A GB822160A GB 822160 A GB822160 A GB 822160A GB 1968655 A GB1968655 A GB 1968655A GB 1968655 A GB1968655 A GB 1968655A GB 822160 A GB822160 A GB 822160A
Authority
GB
United Kingdom
Prior art keywords
nitrocellulose
specified
aqueous liquid
film
solution
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
GB1968655A
Inventor
James Norman Bowtell
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 GB1968655A priority Critical patent/GB822160A/en
Publication of GB822160A publication Critical patent/GB822160A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/221—Applying luminescent coatings in continuous layers
    • H01J9/223—Applying luminescent coatings in continuous layers by uniformly dispersing of liquid

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Luminescent Compositions (AREA)

Abstract

A process for forming a thin metallic film on a C.R.T luminescent screen includes the step of forming a nitrocellulose film, upon the surface of an aqueous liquid on a layer of luminescent powder, from a solution consisting of nitrocellulose, a plasticiser and a spreader liquid in a solvent composed of one or more acetates of aliphatic alcohols not higher than amyl alcohol, the nitrocellulose being of specified low viscosity grade and specified high nitration grade. The nitrocellulose film can be formed on water, and the plasticiser can be an alcohol phthalate such as dioctyl phthalate in specified proportions. The spreader liquid can consist of one or more lower aliphatic alcohols such as a mixture of methyl and ethyl alcohols with or without butyl alcohol in specified concentrations. The concentrations of the materials in the solution are such as to give from 0.005 to 0.015 mg. of nitrocellulose per sq. cm. of surface to be covered. The solution is introduced on to, but not below, the surface of the aqueous liquid by means of a pipette which can be of the kind described in Specification 800,346, [Group XXIX]. The solvent of the nitrocellulose is allowed to evaporate, the aqueous liquid is removed so that a film of nitrocellulose is deposited upon the luminescent powder, a thin layer of metal, e.g. aluminium, is applied to the nitrocellulose film and the nitrocellulose is then removed by heating.ALSO:A process of forming a nitrocellulose film upon an aqueous liquid on the luminescent screen of a cathode-ray tube utilizes a solution consisting of nitrocellulose, a plasticiser and a spreader liquid in a solvent composed of one or more acetates of aliphatic alcohols not higher than amyl alcohol, the nitrocellulose being of specified low viscosity grade and of specified high nitration grade. The plasticiser may be a phthalate such as dioctyl phthalate in specified proportions. The spreader liquid may consist of one or more lower aliphatic alcohols, such as a mixture of methyl and ethyl alcohols, with or without butyl alcohol, in specified concentrations. The concentrations of the materials in the solution are such as to give from 0.005 to 0.015 mg. of nitrocellulose per sq. cm. of surface to be treated. The solution is introduced on to, but not below, the surface of the aqueous liquid by means of a pipette, as described in Specification 800,346, [Group XXIX]. The solvent is allowed to evaporate and the aqueous liquid is removed.
GB1968655A 1955-07-07 1955-07-07 Improvements in or relating to the manufacture of luminescent screens for cathode ray tubes Expired GB822160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1968655A GB822160A (en) 1955-07-07 1955-07-07 Improvements in or relating to the manufacture of luminescent screens for cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1968655A GB822160A (en) 1955-07-07 1955-07-07 Improvements in or relating to the manufacture of luminescent screens for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB822160A true GB822160A (en) 1959-10-21

Family

ID=10133507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1968655A Expired GB822160A (en) 1955-07-07 1955-07-07 Improvements in or relating to the manufacture of luminescent screens for cathode ray tubes

Country Status (1)

Country Link
GB (1) GB822160A (en)

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