Method and apparatus for producing liquid-contents-filled containers from preforms by contents being introduced into the preform under pressure

Abstract

The invention relates to a method and an apparatus for producing liquid-contents-filled containers () from preforms () by contents being introduced into the preform () under a filling pressure, wherein the contents are placed under pressure by a pressure pump () and are introduced into the preform () at a molding and filling station () by a filling valve (). A pressure accumulator () arranged between the pressure pump () and the filling valve () is subjected to pressure and is filled with a volume of contents by the pressure pump (). The invention is distinguished in that a displacement pump () having a filling chamber () for the contents and having a displacement body () guided so it is movable therein is provided, wherein the displacement body () divides the chamber () into a first partial chamber () on the filling station side and a second partial chamber () facing away from the filling station, each of which can be brought into a fluidic connection with the pressure accumulator (). The displacement body () has a drive connection to a drive unit () and is drivable by the drive unit (), wherein when the filling valve () is opened, the drive unit () and/or the pressure accumulator () each at least temporarily apply a drive force to the displacement body (), and at the same time the displacement body () displaces at least a part of the quantity of contents required for the forming of the preform () in the direction of the preform ().