Apparatus and Method of Shaping Plastics Material Pre-forms into Plastics Material Containers with Stretch Bar Movement Sealed Off by Rolling Diaphragm

摘要

An apparatus for shaping plastics material pre-forms into containers includes a blow moulding station on a movable conveying device. The station has a blow mould forming a cavity in which the pre-forms are expandable by a gaseous medium. A stressing device acts upon the pre-forms with the gaseous medium to expand them. A clean room surrounds the blow moulding station at least in part. A stretching unit stretches the pre-forms along their longitudinal direction and includes a stretch bar movable with respect to the plastics material pre-forms. The stretch bar is insertable into the pre-forms. The station has a receiving space with a wall for receiving the stretch bar, which is movable relative to the receiving space and which surrounds the stretch bar at least in part. A flexible sealing device, which separates a sterile room area from a non-sterile room area, is arranged inside the receiving space.