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AssigneeBoehringer Ingelheim Pharma GmbH & Co. KG
InventorsTorsten Kuehn, Burkhard Peter Metzger
Estimating the term…
A process for the production of a container (1) comprising an outer container (2), an inner bag (3) disposed therein and a pressure equalization opening (10) disposed in the outer container (2), and also a container (1) produced according to this process, is described, wherein firstly a pre-molding, comprising two coaxial tubes, is first produced by co-extrusion with the help of a blow mold and with an outwardly-projecting base seam (5) being formed. The process is to form a pressure equalization opening (10) in the outer container (2) of the container (1) without endangering the integrity of the container (1), wherein a lower wastage rate and higher productivity are to be achieved. This is attained by a process wherein the base seam (5) is partially cut off and a force which acts in the direction of the seam is introduced into the pre-molding, which still has a temperature of 40° C. to 70° C., which force breaks open and plastically deforms the base seam (5) so that a pressure equalisation opening (10) is formed in the base area (4).
A process for production of a container (1) provided with a container opening (8), having a substantially rigid outer container (2) and an inner bag (3) disposed therein, which is in contact with the later container contents, these respectively comprising different thermoplastic plastics which are not bonded to each other, and a pressure equalisation opening (10), disposed in the outer container (2), which equalises a pressure difference between the outer container (2) and the inner bag (3), wherein a preliminary molding, comprising two coaxial tubes which have a sufficient length for manufacture of the container, is first produced by co-extrusion between the opened halves of the blow mold, the blow mold is closed and, with that an outwardly-projecting base seam (5) is formed, the excess material in the base area (4) of the container that is to be manufactured being squashed out in such a way that the material of the outer container (2) which is in contact in the area of the seam is welded together, the tube which forms the inner bag is clamped, axially fixed and welded between the wall sections of the outer container (2) and the inner bag (3) is subjected to pressure so that the walls of the preliminary molding lie against the contours of the blow mold from inside, characterised in that on closing the blow mold and with the associated formation of the base seam (5), the seam of the inner bag (3) is at least partially fixed axially in the seam of the outer container and at least one pressure equalisation opening (10) is formed in that the base seam (5) is at least partially cut off after shaping
A process according to one of the preceding claims, characterised in that the production of a container takes place without the formation of a shoulder seam in the form of a squeeze seam.
A process according to one of the preceding claims, characterised in that when the base seam (5) is at least partially broken open, the material which comprises the inner bag (3) remains stuck, on one side of the base seam (5), to the outer container (2) and the ends of the base seam (11), whereupon axial fixing is maintained.
A process according to one of the preceding claims, characterised in that the base seam (5) of the outer container (2) is only partially broken open and the seam of the inner bag (3) is fixed by the unbroken part of the base seam of the outer container (2).
A process according to one of the preceding claims, characterised in that cutting off the base seam (5) and application of the force which opens and permanently deforms the outer container (2) occur simultaneously in one work step.
A process according to one of the preceding claims, characterised in that cutting off the base seam (5) and application of the force which opens and permanently deforms the outer container (2) take place on the plastic blowing machine.
A process according to one of the preceding claims, characterised in that the container (1) is configured in the shape of a bottle.
Dependencies are inferred from the claim text.