DE322552C - Process for the production of filaments for electric light bulbs - Google Patents

Process for the production of filaments for electric light bulbs

Info

Publication number
DE322552C
DE322552C DE1914322552D DE322552DD DE322552C DE 322552 C DE322552 C DE 322552C DE 1914322552 D DE1914322552 D DE 1914322552D DE 322552D D DE322552D D DE 322552DD DE 322552 C DE322552 C DE 322552C
Authority
DE
Germany
Prior art keywords
threads
production
filaments
light bulbs
electric light
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
DE1914322552D
Other languages
German (de)
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.)
Dick Kerr & Co Ltd
Original Assignee
Dick Kerr & Co Ltd
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 Dick Kerr & Co Ltd filed Critical Dick Kerr & Co Ltd
Application granted granted Critical
Publication of DE322552C publication Critical patent/DE322552C/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01KELECTRIC INCANDESCENT LAMPS
    • H01K3/00Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/02Manufacture of incandescent bodies

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)

Description

Verfahren zur Herstellung von Fäden für elektrische Glühlampen. Die vorliegende Erfindung betrifft ein, Verfahren zur Herstellung von Wolframfäden für elektrische Glühlampen und .insbesondere eine weitere Ausbildung der durch das Patent a72347 geschützten Erfindung: Es werden zunächst Fäden aus einer Wolframpaste gespritzt, die nach dem Hauptpatente unter Benutzung von Wasserglaslösung als Bindemittel hergestellt ist. Die gespritzten Fäden werden getrocknet und dann erhitzt, um sie leitend zu machen. Beim Herausnehmen der Fäden aus dem Erhitzüngsofen zeigt sich nun der Übelstand, daß größere Mengen dieser Fäden in Bündeln zusammenhängen, die nur mit Schwierigkeit getrennt werden können. Diesem Übelstande soll durch die vorliegende Erfindung abgeholfen werden.Process for the production of filaments for electric light bulbs. the The present invention relates to a method for producing tungsten filaments for electric incandescent lamps and .in particular a further development of the patent a72347 protected invention: First, threads are injected from a tungsten paste, manufactured according to the main patent using water glass solution as a binder is. The sprayed threads are dried and then heated to make them conductive do. When removing the threads from the heating furnace, the problem now shows up, that larger quantities of these threads are connected in bundles, which only with difficulty can be separated. The present invention is intended to remedy this disadvantage will.

Die gespritzten Fäden werden über Stangen aus Glas u. dgl. gehängt und in Heißluftöfen gelegt, um die Fäden auszuhängen und zu trocknen. Nach dem Trocknen werden sie von Aden Glasstäben entfernt und bündelweise auf Haken aus feuerfestem Metall, wie z. B. Molybdän oder Wolfram, gehängt. Die Haken, von denen die Fäden herunterhängen, werden dann in .einen elektrischen Ofen gebracht, der bei Hellrothitze (etwa -9oo bis 95o° C) gehalten wird. Der innere Teil des Ofens wird mit trockenem Wasserstoff oder einem anderen inerten Gase gefüllt, die an den Haken befindlichen Fäden werden einer gleichmäßigen Erhitzung ausgesetzt. Danach werden sie aus dem Ofen herausgenommen und in ein Bad heißer oder kalter Flußsäure des Handels auf die Dauer von ungefähr einer Stunde gelegt, wodurch die Fadenbündel ziemlich biegsam werden. Durch diese Behandlung mit Flußsäure wird das Bindemittel, welches sich gewissermaßen zwischen den Fäden befindet und deren Aneinanderhaften verursacht, durch den Angriff der Säure entfernt, so daß man die Fäden leicht voneinander trennen kann, während diese selbst dagegen von der Flußsäure nicht angegriffen werden. Die Fäden werden dann aus dem Bade herausgenommen und einige Zeit mitWasser gewaschen, um den Überschuß an Säure zu entfernen. Gegebenenfalls können die Fäden so lange im Wasser bleiben, bis sie für die Endstufe des Verfahrens gebraucht werden sollen.The injected threads are hung over rods made of glass and the like and placed in convection ovens to unhook and dry the threads. After drying They are removed from Aden glass rods and placed in bundles on hooks made of fireproof Metal, such as B. molybdenum or tungsten, hung. The hooks from which the threads hang down, are then placed in an electric oven, which is bright red heat (about -9oo to 95o ° C) is maintained. The inner part of the oven is covered with dry Hydrogen or some other inert gas filled the hooks located on Threads are exposed to even heating. After that, they will be removed from the Remove the furnace and place it in a bath of hot or cold commercial hydrofluoric acid The duration of about an hour is laid, which makes the bundle of threads quite pliable will. By this treatment with hydrofluoric acid, the binder, which is in a sense between the threads and causes them to stick together, removed by the attack of the acid, so that one can easily separate the threads from one another can, while these themselves are not attacked by the hydrofluoric acid. the Threads are then taken out of the bath and washed with water for some time, to remove the excess of acid. If necessary, the threads can last that long remain in the water until they are to be used in the final stage of the process.

Die Weiterbehandlung der Fäden erfolgt in bekannter Weise, und zwar ganz gleich, ob die Sinterung der Fäden im einzelnen vorgenommen wird durch Hindurchleiten eines elektrischen Stromes durch jeden einzelnen Faden, oder - gemeinschaftlich in Bündeln, durch Erhitzen in einem geeigneten elektrischen Ofen auf t5oo bis t6oo° C.The further treatment of the threads takes place in a known manner, namely it does not matter whether the sintering of the threads is carried out individually by passing them through an electric current through each individual thread, or - collectively in bundles, by heating in a suitable electric oven at t5oo to t6oo ° C.

In letzterem Falle sind die Fäden nach dem Entfernen der Bündel aus dem Ofen vollständig voneinander getrennt und dann fertig zum Einsetzen in die Lampen.In the latter case the threads are off after removing the bundle The oven is completely separated from each other and then ready to be inserted into the lamps.

Claims (1)

PATENTANSPRUCH `"erfahren zur Herstellung von Fäden für elektrische Glühlampen gemäß Patent 27-2347 aus gepulvertem, metallischer Wolfram vermittels des Spritzverfahrens, bei welchem Natriumsilikatlösung als Bindemittel benutzt wird, dadurch gekennzeichnet, daß die nach dem Trocknen und Brennen in Bündeln zusammenhängenden Fäden mit wäßriger Flußsäure behandelt und zweckmäßig in Wasser gewaschen werden, zu dem Zweck, die Fäden leicht trennen zu können.PATENT CLAIM "" learn about the production of threads for electrical Incandescent lamps according to patent 27-2347 made of powdered, metallic tungsten by means of the spraying process in which sodium silicate solution is used as a binder, characterized in that, after drying and firing, they are connected in bundles Threads are treated with aqueous hydrofluoric acid and washed in water, for the purpose of being able to separate the threads easily.
DE1914322552D 1913-06-26 1914-05-26 Process for the production of filaments for electric light bulbs Expired DE322552C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB322552X 1913-06-26

Publications (1)

Publication Number Publication Date
DE322552C true DE322552C (en) 1920-07-01

Family

ID=10335738

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1914322552D Expired DE322552C (en) 1913-06-26 1914-05-26 Process for the production of filaments for electric light bulbs

Country Status (1)

Country Link
DE (1) DE322552C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE752641C (en) * 1939-03-19 1953-03-16 Degussa Process for the production of metal powders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE752641C (en) * 1939-03-19 1953-03-16 Degussa Process for the production of metal powders

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