Container provided with a pressure equalization opening
View Patent ↗A process for producing a container comprising an outer container, an inner bag disposed therein and a pressure equalisation opening disposed in the outer container, and a container produced according to this process, is described, wherein a pre-moulding, comprising two coaxial tubes, is first produced by co-extrusion with the help of a blow mould and with an outwardly-projecting base seam being formed. The process forms a pressure equalisation opening in the outer container without endangering the integrity of the container, wherein a lower wastage rate and higher productivity are achieved. To do this, the base seam is partially cut off and a force which acts in the direction of the seam is introduced into the pre-moulding, which has a temperature of 40 degrees C. to 70 degrees C., which force breaks open and plastically deforms the base seam so that a pressure equalisation opening is formed in the base area.
1. A container having a container opening, the container comprising:
(a) a substantially rigid outer container having a pressure equalization opening in a base area thereof; and
(b) an inner bag disposed in the outer container and at least partially fixed axially in a seam of the outer container, wherein
the outer container and inner bag respectively comprise different thermoplastic plastics not bonded to each other except wherein the pressure equalization opening is formed on one side of a longitudinal axis in the base area and the inner bag is affixed to the outer container in the base area on another side of the longitudinal axis, and
the container is configured in the shape of a bottle having a bottle neck with a face side, and the bottle neck is configured with a projection on its face side extending outwards in the radial direction, and the projection is made only from the thermoplastic of the inner bag.
2. A container having a container opening, the container comprising:
(a) a substantially rigid outer container having a pressure equalization opening in a base area thereof; and
(b) an inner bag disposed in the outer container and at least partially fixed axially in a seam of the outer container, wherein
the outer container and inner bag respectively comprise different thermoplastic plastics not bonded to each other,
the container is configured in the shape of a bottle having a bottle neck with a face side,
the inner bag is fixed in an area of the bottle neck and in the base area of the outer container on one side of a longitudinal axis of the container and the pressure equalization opening is formed on an opposite side of the longitudinal axis,
the bottle neck is configured with a projection on its face side extending outwards in the radial direction, and
the projection is made only from the thermoplastic of the inner bag.