Method and device for producing adhesion forces at the top surface of hollow bodies made of plastic

摘要

1. A method of producing adhesion forces at the surfaces of hollow bodies manufactured from nonpolar plastics material in a discontinuous blowing process by means of a corona discharge, wherein the corona discharge is produced by two electrodes which are supplied with an alternating current and of which one is arranged in the interior of each hollow body or in the region of the opening thereof and the other is arranged in the region of its outside surface, characterised in that at the beginning, during or after the blowing operation, a gas or gas mix which fills each hollow body (12) and which is more easily ionisable than air is introduced as a carrier medium for the potential produced by the electrodes and thereafter ionised by means of electrical ignition pulses by collision ionisation, wherein corona discharge is produced at the same time in conjunction with a tool (1, 40) as an earth electrode, which at least partially embraces the hollow body or bodies (12).