| 摘要 |
1,268,962. Capacitors. SIEMENS A.G. 24 June, 1969 [25 June, 1968], No. 31703/69. Heading HIM. In a method of manufacturing capacitors wherein dielectric strips and metal layers are assembled to form a parent capacitor which is divided into individual capacitors, the metal layers at the partition faces are provided with insulating boundary zones by a heat treatment of these faces, and the formation of the insulating zones is enhanced by the presence, in at least some of the dielectric strips of a regulated amount of dielectric solvent such that there is 0À25% by weight of the solvent in the strips in the region of the partition faces. The solvent may be residual solvent from the casting of the strips, and the correct proportion is obtained by storing the strips in an atmosphere containing or lacking the solvent vapours. In such cases the parent capacitor contains the solvent and the heat generated by the cutting operation is sufficient to form the insulating zones. Alternatively the severed capacitors can be stored in a suitable atmosphere until at least the partition face zones include 0À25% solvent and the heat treatment can then be carried out. Preferably, as shown, the parent capacitor comprises alternate dielectric strips 1 containing solvent, e.g. cast polycarbonate strips and strips 6 containing no solvent, e.g. extruded polyethylene terephthalate strips. Both strips 1 and 6 have a metallized layer 7. Heat treatment of the partition faces 2 and 3 causes metallized layers 7 on strips 1 to break up into islands forming insulating borders 4 and 5. The capacitors have high breakdown resistance and good regenerative properties at the cut faces. |
