FI109345B - liquid Packaging - Google Patents

Description

109345

liquid packaging

BACKGROUND OF THE INVENTION The present invention relates to a liquid package formed from a cardboard based liquid packaging laminate having at least one surface comprising one or more plastic layers and comprising a cylindrical or chamfered conical casing and at least one end end connected to the casing a skirt on which the periphery of the jacket is pivoted, wherein the end piece is heat-sealed to the jacket by said overlapping areas.

10 Disposable liquid packaging is increasingly used for the packaging of liquid foods such as milk, juice and wine. Typically, these liquid packages are made from a prefabricated, laminated packaging material comprising a cardboard backing layer covered on at least one and usually on both sides by thin liquid-15 and gas-tight thermoplastic layers, for example polyethylene.

When packing foodstuffs of the above type into a package of the type described in the preamble, such as that disclosed in, for example, Fl patent 102956, the sterility of the package is a very important factor in the preservation of the liquid packaged in the package. If even a small amount of bacteria is left in the packaging during the filling of the package, the consequence is that the stability of the package, so-called. shelf life, drops significantly. In the case of packaging of the type described in the introduction, in particular the diaper and the base. '·· or the seams between the lid are places where adequate sterilization: "]": has proved problematic.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a package which can be sterilized more easily and reliably. This is accomplished by the package according to the invention, characterized in that the joint at which the end piece extends against the inner surface of the jacket. According to the invention, the gap between the wrapper and the end of the package which is very difficult to sterilize is, according to the invention, filled with a plastic material. vapors no longer have to penetrate the gap 35 at the junction, since this gap is now closed. Most preferably, the gap-closing plastic material is at least »♦ # 2 109345 a plastic material flushed from the gap area. a. This way, no separate material is required to fill the joint, but sufficient material can be removed from the layers on the inner surface of the liquid packaging laminate, particularly in the seam region.

5 List of patterns

In the following, the liquid packaging according to the invention will be described in more detail with reference to the accompanying drawing, in which Fig. 1 is a top view of an exemplary embodiment of a liquid packaging according to the invention; Fig. 2 is a cross-sectional view of the joint

DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows an exemplary embodiment of a liquid package according to the invention. This package comprises a cylindrical or alternatively frustoconical sheath 1 with end pieces 2 and 3 attached to the ends thereof. One of the end pieces is provided with a sealing strip 6 covering the outlet 7. The material of both the sheath 1 and the end piece 2 and / or 20 the at least one surface thereof, i.e. the surface facing the inside of the package in the finished package, comprises at least one layer of plastic material.

* ..! If the barrier layer of the packaging laminate is an aluminum foil, there may be only one of these '' inner plastic layers, but if the barrier layer of the packaging laminate is ··· 25 na EVOH, the plastic material layers also include this barrier layer: '*: several.

Figure 2 is a cross-sectional view of the bottom seam of the package of Figure 1, i.e. the seam between the sheath 1 and the bottom 3. This seam is provided such that the base 3 is provided relative to its general plane. '. : 30 with flip-flop 4 perpendicular to the direction and this end-piece 3 is sit-. ··. inserted into the end of the jacket 1 with the flap 4 facing outwards. After this · ', the edge 6 of the sheath 1 is turned over the flap 4. The sealing is effected by: hot sealing by pressing hot press jaws on part 6 of the sheath 1 turned over the flap 4 at a corresponding position against the flap 4. . ·. 35 pan 1 against portion 5. For example, Fl-. ··> can be used for this purpose. Packaging apparatus known from patent application 981222. The jaws as described therein 3 109345 clamp said areas 4, 5 and 6 against each other such that the layers of plastic material on their respective counter surfaces melt and adhere to one another.

For joining point 8, that is to say, where the skirt 3 of the base 3 points to | In accordance with the invention, the inner surface of the pan 1 without forming a gap in which the bacteria could remain stuck despite sterilization has been treated as shown in Fig. 3. Figure 3 shows on a larger scale the junction 8 of Figure 2. As shown in Figure 3, the junction 4 where the flange 4 of the end piece 3 abuts against the inner surface of the diaper 1 is filled with a plastic mat 10 to close the tapered gap between the flange 4 and the diaper 1. .

In this way, the narrow portion of the gap is closed so that the remaining gap, i.e. the gap remaining from the plastic material 9 towards the interior of the package, is already wide enough to allow sterilizing agents such as hydrogen peroxide and hot steam to penetrate this wide gap.

The plastic material 9 at said junction is most preferably provided by the layers of plastic material on the outer surface of the flap 4 and on the inner surface of the portion 5 of the jacket 1 which is positioned against it. These can be soldered to the top of the slot at position 8 by using a compression tool to close the seam, using a compression force and temperature to cause the plastic materials in the area to be soldered to position 8. This can also be observed from the enlarged sectional view of FIG. elsewhere on the inside of sheath 1 and base 3. ···. layers of plastic material 10 and 11, respectively, on the surface. The temperature of the press jaws required for this plastic material flow naturally depends on the plastic material being fluidized, but may be as high as about 400 ° C.

The liquid packaging according to the invention has been described above by way of one exemplary embodiment only, and it is to be understood that some modifications thereof may be made without departing from the scope defined by the appended claims. Thus, it is not excluded that the plastic material to be placed at the connection · '' ': originates outside the packaging itself. 'laminate coatings. For this purpose, for example, a suitable thin, thin ring of plastic material or the like could be placed in a suitable area of the diaper or end piece, which would then be melted when the seam was closed; ]: at the joining point for stuffing.

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Claims (2)

A liquid package formed from a cardboard-based liquid packaging laminate comprising at least one of its surfaces, one or more plastic layers, said liquid package comprising a sheath (1) in the form of a cylinder or a frustoconical cone and at least one end thereof. connected end piece (2, 3), which is arranged inside the male end and comprises a case (4) pivoted in the direction of the sheath on which the edge (6) of the sheath is pivoted, the end piece (3) being fixed to the men by heat sealing said abutment spacers (4, 5, 6) to each other, characterized in that the joint (8), wherein the case (4) of the end piece (3) is placed against the inner surface of the sheath (1), comprises plastic material (9) for sealing a run between the cases (4) and men (1) on the inner side of the package. Liquid package according to claim 1, characterized in that the plastic material (9) which closes the gap is plastic material derived from the cover of the sheath (1) and the laminate material coating of the end piece (3) at least mainly from the area of the gap. • · · *