Verfahren zur Herstellung dünner Kondensatorbänder

1,081,230. Capacitor strips. SIEMENS A.G. Dec. 22, 1964 [Dec. 23, 1963], No. 52143/64. Heading H1M. A process for the manufacture of a capacitor strip comprises forming a layer assembly by applying a first varnish layer 2 to a carrier strip 12, Fig. 7 (or 1, Fig. 1), vapour depositing a metal layer 3 on said varnish layer 2, applying on metal layer 3 a varnish layer or a dielectric strip 4, and, if desired, applying further alternate metal and varnish layers, applying an auxiliary carrier strip 121, Fig. 7 (or 5, Fig. 2) to the face of said assembly remote from said first carrier strip, peeling off said first carrier strip, and vapour depositing a metal layer 6 on the surface of said first varnish layer 2 previously covered by said first carrier strip, and, if desired, applying a further varnish layer 7 on the metal layer 6. In Fig. 6, the metal layers extend up to the edge on one longitudinal side only of the strip so that when two such strips are rolled together to form a capacitor and the electrodes contacted by spraying metal on to the ends of the rolled assembly, the metal layers 3, 6 are conductively connected and the varnish layers 2 are in a field'-free space. Hence, the varnish layer 2 is of a material having good self-healing properties, e.g. cellulose, benzylcellulose, nitrocellulose, ethylcellulose, acetylcellulose, acetobutyl &e., or polyamides, polyacrylates, polyurethanes, and polyesters, and the other varnish layers, 4, 7 are of a material having good dielectric properties. In an alternative form, one of the metal layers extends to one longitudinal side only and the other metal layer to the other longitudinal side only so that when this single strip is rolled and the electrodes contacted, the first varnish layer 2 is dielectrically active. Hence, the varnish layer 2 is of a material having good dielectric properties, e.g. polystyrene, acetylcellulose. The auxiliary carrier strip may serve as at least part of the dielectric. The metal layers applied to the first varnish layer can be subdivided by a pattern of cracks. In Fig. 7, a supply reel 10 carries a layer assembly 11 (Fig. 1) and carrier strip 12, for example of paper impregnated with hydrocarbons. An auxiliary carrier strip 121 contacts the assembly 11 and the three strips are passed over a heated bonding roller 13 to effect bonding of the carrier strip 121 to the layer assembly 11, after which the original carrier strip 12 is peeled away from the layer assembly 11 by a roller 14 and a