DE3600899A1 - Process for cleaning glassy fluorescent screen supports - Google Patents
Process for cleaning glassy fluorescent screen supportsInfo
- Publication number
- DE3600899A1 DE3600899A1 DE19863600899 DE3600899A DE3600899A1 DE 3600899 A1 DE3600899 A1 DE 3600899A1 DE 19863600899 DE19863600899 DE 19863600899 DE 3600899 A DE3600899 A DE 3600899A DE 3600899 A1 DE3600899 A1 DE 3600899A1
- Authority
- DE
- Germany
- Prior art keywords
- amine
- fluorescent screen
- organic acid
- acid
- screen supports
- 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.)
- Withdrawn
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
-
- 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
- H01J9/38—Exhausting, degassing, filling, or cleaning vessels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren nach dem Oberbegriff des Patentanspruches 1.The present invention relates to a method according to the preamble of claim 1.
Es ist bekannt, bei der Herstellung von Leuchtschirmen für Kathodenstrahlröhren den Leuchtstoff in einem Sedimentationsverfahren über Siliciumdioxid an der Glasoberfläche anzukleben. Ein üblicher Sedimentationsvorgang besteht darin, daß der Leuchtstoff mit Kaliwasserglas in einem vorgelegten Elektrolyten (z. B. Ba(NO3)2) mit Düsen eingebracht wird, wobei SiO2 ausfällt und der Leuchtstoffpartikel festklebt. Bei fehlerhaften Leuchtschirmen wird der Leuchtstoff wieder abgewaschen, was z. B. mittels Flußsäure geschieht. Dabei ist es unvermeidlich, daß die Glasoberfläche zumindest teilweise angeätzt wird, was bei Leuchtschirmen mit hohem Auflösungsvermögen unerwünscht ist.It is known in the manufacture of fluorescent screens for cathode ray tubes to adhere the phosphor to the glass surface in a sedimentation process over silicon dioxide. A common sedimentation process consists in introducing the phosphor with potash water glass into an electrolyte (eg Ba (NO 3 ) 2 ) with nozzles, with SiO 2 failing and the phosphor particle sticking. In the case of faulty fluorescent screens, the phosphor is washed off again. B. happens by means of hydrofluoric acid. It is inevitable that the glass surface is at least partially etched, which is undesirable for fluorescent screens with high resolution.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren der vorgenannten Art so zu verbessern, daß das Reinigungsverfahren keine störenden Spuren auf der Glasoberfläche des Leuchtschirmträgers hinterläßt.The present invention is based on the object to improve a method of the aforementioned type that the cleaning process shows no disturbing traces leaves the glass surface of the fluorescent screen support.
Diese Aufgabe wird gemäß den in dem Kennzeichen des Patentanspruches 1 angegebenen Merkmale gelöst.This task is carried out in accordance with the requirements of the Features specified 1 solved.
Das beschriebene Reinigungsverfahren ermöglicht in einfacher Weise die Entfernung von Verunreinigungen auf Glasoberflächen. Insbesondere mittels SiO2 angeklebte Leuchtstoffschichten werden vollständig und sauber entfernt, ohne daß die Glasoberfläche störend angegriffen wird. Ein erfindungsgemäß gereinigter Leuchtschirmträger kann wieder mit Leuchtstoff für einen hochauflösenden Leuchtschirm beschichtet werden.The cleaning method described enables contaminants to be removed from glass surfaces in a simple manner. In particular, phosphor layers adhered by means of SiO 2 are completely and cleanly removed without the glass surface being attacked in a disruptive manner. A luminescent screen support cleaned according to the invention can again be coated with phosphor for a high-resolution luminescent screen.
Anhand des nachfolgend beschriebenen Ausführungsbeispiels wird die Erfindung näher erläutert.Using the exemplary embodiment described below the invention is explained in more detail.
Von einem Leuchtschirmträger aus Glas soll eine fehlerhafte Leuchtstoffschicht wieder entfernt werden. Die Leuchtstoffschicht war durch Eindüsen des Leuchtstoffes und Kaliwasserglas in einem vorgelegten Elektrolyten aus Ba(NO3)2 sedimentiert worden. Dabei ausgefälltes SiO2 hat die Leuchtstoffpartikel an der Glasoberfläche festgeklebt.A defective phosphor layer should be removed from a fluorescent glass support. The phosphor layer had been sedimented by injecting the phosphor and potash water glass into an electrolyte made of Ba (NO 3 ) 2 . Precipitated SiO 2 adhered the phosphor particles to the glass surface.
Zur Entfernung dieser Leuchtstoffschicht bzw. Schichtteile wird der Leuchtschirmträger mit einer organischen Säure, der ein Amin oder ein Glykol zugesetzt wurde, gewaschen. Dabei wird die Glasoberfläche sauber gereinigt, ohne daß Verätzungen auftreten, wie sie z. B. durch Flußsäure verursacht werden. To remove this phosphor layer or layer parts the fluorescent screen support with an organic Acid to which an amine or a glycol has been added washed. The glass surface is cleaned clean, without the occurrence of burns such as z. B. caused by hydrofluoric acid.
Als organische Säure wird Essigsäure, Zitronensäure oder bevorzugt Weinsäure in einer etwa 0,5 bis 20-gewichtsprozentigen Verdünnung verwendet. Als Amin oder Amingemisch hat sich besonders Triäthanolamin und als Glykol besonders Triäthylenglykol in etwa einer 0,1 bis 2-gewichtsprozentigen Verdünnung bewährt. Der derart gerinigte Leuchtschirmträger kann wieder verwendet werden.The organic acid is acetic acid, citric acid or preferably tartaric acid in about 0.5 to 20 weight percent Dilution used. As an amine or Amine mixture has been found to be especially triethanolamine and as Glycol especially triethylene glycol in about a 0.1 proven up to 2% by weight dilution. The fluorescent screen carriers cleaned in this way can be reused will.
Amine werden zweckmäßig in einer solchen Menge zugesetzt, daß sich ein PH-Wert von etwa 3 bis 5 einstellt.Amines are expediently added in such an amount that a pH of about 3 to 5 is established.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863600899 DE3600899A1 (en) | 1986-01-15 | 1986-01-15 | Process for cleaning glassy fluorescent screen supports |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863600899 DE3600899A1 (en) | 1986-01-15 | 1986-01-15 | Process for cleaning glassy fluorescent screen supports |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3600899A1 true DE3600899A1 (en) | 1987-07-16 |
Family
ID=6291842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19863600899 Withdrawn DE3600899A1 (en) | 1986-01-15 | 1986-01-15 | Process for cleaning glassy fluorescent screen supports |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3600899A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3841255A1 (en) * | 1987-12-09 | 1989-06-22 | Central Glass Co Ltd | METHOD FOR FORMING A PATTERNED FILM ON A SUBSTRATE SURFACE USING A METAL ALKOXIDE SOL |
DE4102886A1 (en) * | 1991-01-31 | 1992-08-06 | Georg Van Eyk | Reducing the release of heavy metals, esp. lead, from glass surfaces - by treatment with an aq. complex-forming extn. medium |
US6383696B2 (en) * | 1998-06-11 | 2002-05-07 | Micron Technology, Inc. | Methods of forming a face plate assembly of a color display |
-
1986
- 1986-01-15 DE DE19863600899 patent/DE3600899A1/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3841255A1 (en) * | 1987-12-09 | 1989-06-22 | Central Glass Co Ltd | METHOD FOR FORMING A PATTERNED FILM ON A SUBSTRATE SURFACE USING A METAL ALKOXIDE SOL |
DE3841255C2 (en) * | 1987-12-09 | 1993-08-05 | Central Glass Co., Ltd., Yamaguchi, Jp | |
DE4102886A1 (en) * | 1991-01-31 | 1992-08-06 | Georg Van Eyk | Reducing the release of heavy metals, esp. lead, from glass surfaces - by treatment with an aq. complex-forming extn. medium |
US6383696B2 (en) * | 1998-06-11 | 2002-05-07 | Micron Technology, Inc. | Methods of forming a face plate assembly of a color display |
US6406603B2 (en) * | 1998-06-11 | 2002-06-18 | Micron Technology, Inc. | Methods of forming a face plate assembly of a color display |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8120 | Willingness to grant licenses paragraph 23 | ||
8139 | Disposal/non-payment of the annual fee |