Abstract: Method of sterilizing a packaging material with a sterilizing agent in liquid form. The packaging material is discharged in order to eliminate electrostatic surface charged on the packaging material, after which the packaging material is wetted with the sterilizing agent which is applied in an electrostatically charged form to those areas of the packaging material which are to be sterilized. The packaging material with the sterilizing agent, which coalesces to a thin, homogeneous film, is finally heated to drive away the sterilizing agent from the sterilized packaging material.

Abstract: An arrangement for the volume-controlled feed of a medium, e.g. a liquid, in an outer flow system, comprising a movable pump piston (10) and a metering chamber (20) in connection, or connectable, to the flow system via a valve-controlled inlet (22) and outlet (23) for the intake and discharge respectively of the medium in time with the working cycles of the pump piston (10). To make possible the change between different desired feed volumes of the medium the arrangement has a wall element (15) delimiting the volume of the metering chamber (20) which is movable inside the metering chamber (20) for the adjustment of the desired metering chamber volume.