Container and set of preforms for forming a container

A set of preforms for forming a bag-in-container, comprising an inner preform and an outer preform,

• wherein a neck portion of one of the preforms is provided with at least one opening extending substantially radially there through, into a space between the outer preform and a part of the inner preform adjacent thereto,
• wherein the neck portion is provided with at least one of
• coupling elements, at opposite sides of said at least one opening, seen in circumferential direction;
• and
• a coupler element in or partly formed by the at least one opening for releasably coupling of a pressure medium feed line to a bag-in-container after blow moulding of the preforms, for introducing a pressure fluid through said at least one opening into a space between inner and outer containers,
• wherein the outer and inner preforms each have neck portions, wherein a ring is connected to the free ends of the neck portions.

A method for forming a set of preforms for integrally blow moulding a bag-in-container comprising,

• inserting an inner preform into an outer preform, wherein the inner preform is connected to the outer preform by at least a ring, welded or glued to a free end of at least one of the inner and outer preforms,
• wherein the ring is an integral part of or is connected to the other of the inner and outer preform,
• wherein a space between the inner and outer preform is closed off by said ring,
• wherein at least one opening is provided through a neck portion of the inner preform or outer preform, opening into said space and extending substantially radially through a wall of said neck portion, and
• wherein the set of preforms are then integrally blow moulded to form a bag-in-container.

A bag-in-container comprising a neck region with at least one opening extending substantially radially there through, into a space between an outer container and an inner container adjacent thereto, wherein:

• the neck region is provided with coupling elements, at opposite sides of said at least one opening, seen in circumferential direction, for coupling of a connecting device to the bag-in-container for introducing a pressure fluid through said at least one opening into a space between the inner and outer containers;
• and/or
• the at least one opening is provided with or forming part of a first coupler for coupling a pressure fluid feed line to said opening, for pressurizing the space between the inner and outer containers,
• wherein a ring is provided with at least one circumferential wall part, extending substantially parallel to a longitudinal axis of the bag-in-container or at least of the neck region thereof, and
• wherein teeth are provided on said wall part for engaging a spin welding tool.