AT127137B

AT127137B - Electrical conductors insulated with multiple seamless layers of gutta percha.

Info

Publication number: AT127137B
Authority: AT
Inventors: Josef Jaennisch
Original assignee: Siemens Schuckertwerke Wien
Priority date: 1929-06-07
Filing date: 1929-06-07
Publication date: 1932-03-10

Description

  

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  Mit mehreren nahtlosen Guttaperchaschichten isolierter elektrischer Leiter. 
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   Beispielsweise hatten nach der Erfindung isolierte zweiadrige Telephonsehnüre von   1'80'In Länge   bei 72% Luftfeuchtigkeit nach 24 Stunden einen Isolationswiderstand von über 40.000 Megohm, in steigender Luftfeuchtigkeit von 90-98   %   nach weiteren 198 Stunden noch über 3500 Megohm, in   100%   Luftfeuchtigkeit nach weiteren 56 Stunden noch über 1100 Megohm. 



   Bei Guttapercha befürchtet man   zuweilen Unbeständigkeit   gegen Licht und Luft. Solche Einflüsse sind beim Gegenstand der Erfindung leicht auszuschliessen, indem die   Guttaperchaschiehten   einzeln oder gemeinsam mit einer luftdichten und für chemisch wirksames   Licht undurchlässigen   nahtlosen Hülle vorzugsweise aus gefärbten Zellulosederivaten überzogen werden. 



   Die Guttapercha wird in bekannter Weise in Lösung (z. B. in Chloroform) etwa nach dem Durchziehverfahren auf den Leiter oder die   Zwischenhülle   aufgebracht. Gemäss der Erfindung wird ein weiterer Überzug erst nach dem Eintrocknen (Erstarren) des vorhergehenden Überzuges aufgetragen, um zu 
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PATENT-ANSPRÜCHE :
1. Mit mehreren nahtlosen Guttaperchaschichten isolierter elektrischer Leiter, gekennzeichnet durch mehrere nahtlose Guttaperchaschichten je in der Stärke von Bruchteilen eines Millimeters, die vorzugsweise unmittelbar übereinanderliegen, aber auch mit andersartigen Schichten abwechseln können.



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  Electrical conductors insulated with multiple seamless layers of gutta percha.
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   For example, according to the invention, insulated two-wire telephone cords 1'80 'in length at 72% humidity had an insulation resistance of over 40,000 megohms after 24 hours, and in an increasing humidity of 90-98%, after another 198 hours, still over 3500 megohms, in 100% humidity after another 56 hours still over 1100 megohms.



   In the case of gutta-percha, it is sometimes feared that it is not resistant to light and air. In the subject matter of the invention, such influences can easily be ruled out by covering the gutta-percha point individually or jointly with an airtight seamless casing, which is impermeable to chemically effective light, preferably made of colored cellulose derivatives.



   The gutta-percha is applied to the conductor or the intermediate sheath in a known manner in solution (e.g. in chloroform) using the pull-through process. According to the invention, a further coating is only applied after the previous coating has dried (solidified) in order to
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PATENT CLAIMS:
1. Electrical conductors insulated with several seamless gutta-percha layers, characterized by several seamless gutta-percha layers each with a thickness of fractions of a millimeter, which preferably lie directly on top of one another, but can also alternate with different types of layers.

Claims

2. Insulated conductor according to claim 1 or 2, characterized in that the seamless gutta-percha layers each have a wall thickness in the order of magnitude of 0.01 to 0.03 inches.

3. Insulated conductor according to claim 1, 2 or 3, characterized in that it is covered with a chemically non-insulating fiber layer and above it with four to eight seamless gutta-percha layers.

4. Insulated conductor according to claim 1 or one of the dependent claims, in particular Leonean conductor or jumper wire, characterized in that its multi-layer seamless guttapereha insulation has a total wall thickness in the order of magnitude of 01 mm.

5. Insulated conductor according to claim 1 or one of the dependent claims, characterized in that the gutta-percha layers individually or together with an airtight and for chemically effective. Light impermeable shell are preferably coated from colored cellulose derivatives.

6. insulation method for the conductor according to claim 1 or one of the dependent claims, in which the gutta-percha in solution, preferably in chloroform by the pull-through process, is applied to the conductor or an intermediate cover, characterized in that the conductor is coated with the gutta-percha solution and according to it Drying up (solidification) the procedure is repeated.