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AssigneeMetalvuoto Films S.p.A.
InventorPietro Ronchi
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The formation of three layers of overlapped metals having different thicknesses is provided on a dielectric film, these layers being a very thin layer of silver, copper or their alloys, a second zinc layer provided with a reinforcement and a third layer of aluminium or aluminium alloy comprising a percentage of titanium, silicon or cadmium lower than 1%. The layers are obtained by depositing metal vapours in a chamber at a pressure of about 10.sup.-4 torr. The apparatus comprises a vacuum chamber (10) divided in two sections (11 and 12), section (11) being a film's transit area, while in section (12) separate evaporating devices for the three metals are foreseen. Particularly, a resistive bar is foreseen for melting silver, copper or their alloys, a radiation furnace for zinc and a heated cylindric bar for aluminium or aluminium alloys.
A process for making metallized films for electric capacitors according to which three overlapped metal layers are deposited on a film of dielectric material, wherein the film is caused to pass through a chamber at a pressure of about 10.sup.-4 torr (1,3.10.sup.-2 Pa);
An apparatus for making a metallized film for electric capacitors, characterized in that it comprises a vacuum chamber (10) divided in two sections (11 and 12) the first section (11) being at a pressure of 10.sup.-2 -10.sup.-3 torr (1,3- 0,13 Pa) and the second section (12) at a pressure of 10.sup.-4 torr (1,3.10.sup.-2 Pa);
A metallized film comprising three layers of different material laid on a dielectric film, the first layer (31) being silver, copper or their alloys, which is thinner than the second (32) one which is a layer of zinc and the third (33) a layer of aluminium or aluminium alloy, comprising a percentage of titanium, silicon or cadmium lower than 1%, and in that it has uncovered peripheral edges (36).
Dependencies are inferred from the claim text.