Patent ID: 9573315
Date: 2017-02-21
CPC Classifications: B29C

Claim:
1. An apparatus for shaping plastics material pre-forms into plastics material containers, the apparatus comprising: a blow molding station arranged on a movable conveying device, the blow molding station having a blow mold forming a cavity in an interior of which the plastics material pre-forms are expandable by being acted upon with a gaseous medium in order to form the plastics material containers; a stressing device which acts upon the plastics material pre-forms with the gaseous medium in order to expand the plastics material pre-forms; a clean room which surrounds the blow molding station at least in part; and a stretching unit which stretches the plastics material pre-forms along a longitudinal direction of the plastics material pre-forms, wherein the stretching unit has a stretch bar which is movable with respect to the plastics material pre-forms and which is insertable into the plastics material pre-forms, wherein the blow molding station has a receiving space with at least one wall for receiving the stretch bar, wherein said receiving space surrounds the stretch bar at least in part and the stretch bar is movable with respect to said receiving space, wherein a flexible sealing device, which separates a sterile room area of the apparatus from a non-sterile room area of the apparatus, is arranged inside the receiving space, wherein the stretch bar moves permanently in the sterile room area, wherein the sealing device is designed in the form of a rolling diaphragm, the apparatus has a drive device for moving the stretch bar along a longitudinal direction thereof, said drive device being arranged outside the clean room, wherein the sealing device has a first end portion arranged in a stationary manner in the direction of movement of the stretch bar and a second end portion movable in the direction of movement of the stretch bar, and wherein the second end portion is mounted onto a carrier with no direct contact with the stretch bar, said carrier moving the stretch bar.