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AssigneeHoechst Aktiengesellschaft
InventorsPeter Dinter, Hermann Dallmann, Lothar Bothe, John D. Gribbin
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Pretreating the surface of electrically conducting molded materials, such as metal foil or plastic films in whose polymer matrix electrically conducting particles have been incorporated, by means of electrical corona discharge is provided. A generator subjects the high voltage discharge electrodes of the corona discharge to a high-frequency alternating current of high voltage. The metal core of a roller, over whose metallic circumference a film web or foil is transported, serves as the grounded metallic counter-electrodes. A housing encloses the high voltage electrodes of the corona discharge and is connected via a line to an atomizer apparatus, in which a liquid is atomized to give a suspendible aerosol by means of a piezoelectric ultrasonic vibrator system or by two-material atomizer nozzles operating at the speed of sound. A blower whose throughput can be regulated is connected to the atomizing apparatus and conveys the carrier gas, for example air, for the aerosol through the atomizing apparatus into the corona discharge.
A process for pretreating the surface of a single-layer or multilayer molded material by means of an electrical corona discharge treatment taking place in the space between high voltage discharge electrodes and a grounded counter-electrode space therefrom, said space between said high voltage electrodes and said ground counter-electrode forming a corona discharge zone, where said single-layer or multilayer molded material is located, said process comprising:
Apparatus for pretreating the surface of a molded material, comprising:
Apparatus for pretreating the surface of molded material, comprising an electrostatic corona discharge means having high voltage electrodes, a high frequency, high voltage generator connected with said high voltage electrodes, and a grounded counter-electrode spaced a given distance away from said high voltage electrodes;
Dependencies are inferred from the claim text.