Process and apparatus for pretreating the surface of a single-layer or multilayer molded material by means of an electrical corona discharge

US4940521A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Peter Dinter · Obermoschel, DE
• Hermann Dallmann · Wiesbaden, DE
• Lothar Bothe · Mainz, DE
• John D. Gribbin · Schlangenbad, DE

Key dates

• Filing date: Aug 8, 1989
• Grant date: Jul 10, 1990
• Expiry date: Aug 8, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S422/907
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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.