Laminated package

#The present invention refers to a package involving a bottom field and a number of sides, preferably four, raised in relation to the bottom field and kept together by double folded corner parts, the material of the package consisting of a stiff backing sheet, for instance of cardboard, enclosed between two outer flexible foils of plastics and/or aluminum, etc.

#According to the invention the package is characterized by the fact that the backing sheet presents parts within the corner parts, from which all material has been removed, by means of which the finished package will have double folded flexible sealing flaps, totally or partly lacking inner stiffening backing sheet material. By this several real advantages are gained. Among other things a package of rather uniform thickness can be produced without the double folded parts of the corresponding conventional cardboard packages, which often give you trouble since, owing to their thickness, they can not be made quite tight-fitting. This is particularly important if you want to produce a wholly sterile preserving-package, which of course must be absolutely airtight.

#Furthermore, a number of advantages are gained that will be more thoroughly described in the following detailed description of a few preferable embodiments. These are described with reference to the attached drawings, which also show a plant for producing packaging elements to be used in packages according to the invention.

#FIG. 1 accordingly shows a plain backing sheet, intended to be an enclosed part of the package according to the invention.

#FIGS. 2 and 3 show sections along line II--II in FIG. 1 and should illustrate these sections in horizontal and raised positions, respectively.

#The backing sheet shown in FIG. 1 preferably consists of cardboard but can of course also be made of other corresponding stiff materials. The carboard element shown by way of example involves a bottom field 1, four side field 2, 3, 4 and 5, and four mainly triangular extension parts 6, which are connected with the side fields 4 and 5. As will best be seen by a comparison between FIGS. 1, 2 and 3, the bottom field 1 is separated from the side fields 2-5 by scratched folding lines 7. These V-formed folding lines 7 are cut down to about two thirds of the thickness of the cardboard material and have a form that will cause the least possible strain in the raising process to the outer foils with which the material is later to be laminated, as will be shown in detail in the following. Between the side fields 2 and 3 and the adjacent triangular extension parts 6 parts of the material 8 have been cut off by stamping, their innermost parts ending in a rather small circular hole 9. The hole 9 is also made by stamping and will be further explained later. In practice it has a diameter of 2-4 mm.

#If in FIG. 1 the border lines between the parts 8 and the side fields 2 and 3 are compared with the scratched folding lines 7, it will be found that the former are laterally dislocated 0.5-1 mm in relation to the latter. The same is applicable to the extension parts 6, i.e. the parts 8 are somewhat enlarged in relation to the theoretically true size of a certain cardboard element. This enlargement is to compensate later for the applied outer material as will be seen in the following.

#FIGS. 4-6 describe how the cardboard material according to FIG. 1 can be enclosed between outer foils of plastic and/or aluminum. Both in FIG. 5 and FIG. 6 the upper surface is meant to form the inner surface of the ready package. According to the embodiment shown in FIG. 5 the cardboard element, which as a whole has obtained the reference numeral 10, is thus intended to be enclosed between an inner plastic foil 11 and an outer one 12, an aluminum foil 13 being placed inbetween the plastics foil 12 and the cardboard element 10. With reference numerals 14 and 15, respectively, two binder layers are marked, which can be of an arbitrary kind but preferably consist of a two-component lacquer of the sort that is normally used in the lacquer-laminating of foils.