CH671557A5 - - Google Patents

Description

DESCRIPTION

The invention relates to a packaging for liquids with flat side walls, bottom and lid, which are connected to one another via folding and / or welding lines.

Cuboid packs for milk or fruit juices are known, which are made of carrier material coated on both sides with plastic, e.g. Paper or cardboard. These cuboidal liquid packs each have two opposing double-walled triangular fields on the bottom and lid, which are folded around the adjacent bending line after the packaging has been filled and closed and sealed onto the side wall or the lid or bottom. Liquid packs of this type can be produced in high-performance machines (large quantities per unit of time), can be easily transported and have a wide variety of opening devices which are more or less easy to handle by the end user.

Since the known liquid packs are disposable packs, the packaging manufacturers strive to keep the material used per packaging unit to a minimum. For the opening and handling of such a liquid pack, at least the side panels must have a certain stiffness so that the pack can be gripped, lifted and rotated and the filling material is prevented from sloshing out. The side walls, which are thus stiff, must also be kept at a distance from one another with a certain strength, because otherwise all handling advantages are nullified. For this reason, paper of a certain stiffness has always been used in order to meet the above-mentioned conditions. It is understood by the person skilled in the art that in the case of the double-walled triangular fields or other flaps, for example also in the case of the double cardboard strips for the sealing seams, such a stiff material is superfluous and therefore represents a loss. On the contrary, when folding multilayer flaps, cardboard strips or triangular fields, there are even tightness problems.

The object of the invention is therefore to improve a packaging and its manufacturing process in such a way that, despite maintaining the necessary rigidity, better utilization of the material required for producing the packaging is ensured.

For the liquid pack itself, this object is achieved according to the invention in that all outer surfaces of the pack are formed from a film made of elastic plastic and only the bottom, cover and two side walls are additionally backed with a stiffening plate made of plastic. The liquid pack created in this way therefore no longer contains paper or cardboard used as a carrier material, especially since the stiffening plate is preferably made of plastic. Nevertheless, one can also imagine that the stiffening plate is made of at least partially coated stiff paper material. The invention is described below in connection with a stiffening plate made of plastic, and this material is preferred because it can be processed particularly well in high-performance machines.

The novelty of the pack according to the invention is the fact that no longer all six fields of a cuboid pack but only four of them consist of the more complex, more rigid material. According to the invention, the remaining two wall panels, for example the front side walls of a liquid pack, are only formed from the elastic plastic, which e.g. very cheap as a film5

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is commercially available and easy to process. In this way, compared to the liquid packs made from paper webs, there is a not inconsiderable material saving, which is all the more significant since liquid packs are generally a mass product. All wall fields of the pack according to the invention can be dimensioned correctly with regard to the material consumption. The fields for the flaps, cardboard strips or double triangular fields, which were previously oversized in the prior art, have advantageously been eliminated.

A preferred embodiment of the packaging according to the invention is characterized in that a carrier tape is attached running across the packaging. If a particularly thin film is used as the elastic plastic, then after the packing according to the invention has been filled there is the possibility of bulging and thus transport and stacking problems. Exactly this bulging can be avoided by means of a carrier tape, which preferably runs from one end wall surface to the opposite, just this side wall panels formed only from the elastic plastic film, so that even these packing walls provided without stiffening plates practically no longer bulge. The rectangular shape of the new pack is thus guaranteed even when using thin plastic films.

It is also advantageous according to the invention if the stiffening plate is profiled and at least partially sealed with the elastic plastic film. This measure also saves material, because even the plastic sheet for creating the stiffening plates can be made thinner if beads, ribs, creases, grooves or other types of profiling of this stiffer plastic sheet ensure that a strong stiffening plate is obtained even with thin material lets create. By sealing the stiffening plate with the elastic plastic film, the entire material can be handled better during manufacture and further increases the strength of the finished package.

In a further advantageous embodiment of the invention, the two side walls deposited with the stiffening plate lie opposite one another, and the carrier tape is arranged at a distance from and parallel to these side walls and sealed with the elastic plastic film. These measures result in the embodiment already indicated above, in which the material with the stiffening plate forms the cover and base and two opposite side walls connecting the cover and base, while the front side walls without a stiffening plate consist only of the elastic plastic film. In this plastic film, a carrier tape, which is also made of sealable plastic, is sealed in and thus held taut between the end side walls. Although this carrier tape is in the middle of the filling material, it does not impair the filling material in any way, since its material is practically inert for the filling material in question. The new liquid pack is given additional rigidity by the carrier tape, which is particularly optimized if, in a further advantageous embodiment of the invention, a sealing seam is provided in the center of the lid and in the center of the two side walls without a stiffening plate. The carrier tape is welded into the sealing seam that is not in the lid, that is to say in the opposite end side walls. This simplifies and simplifies the production of the liquid pack because, at the same time as the front side walls are closed, the carrier tape is also welded in. The use of so-called separation welding tools is particularly expedient here.

It is also expedient according to the invention if tabs are folded out from opposite side wall fields of the stiffening plate to form handle supports, which are directed towards one another in pairs and protrude transversely from these side wall fields. The stiffening plate, which is to form the large side wall panel of the new liquid pack, has sufficient strength and rigidity, in particular due to the profiles, so that the cutting out of a tab and the folding out across the side wall panel in no way impairs the rigidity required for handling the pack. Since opposite side wall panels have been reinforced with the stiffening plates, these tabs can be articulated in pairs on each end face 15, so that when the pack is gripped in the area of these tabs a handle support is also formed so that the pack is easy to handle, e.g. the pouring is not significantly deformed even by the grip pressure. This promotes pouring in an exact pouring stream. 20 The process for producing the packaging for liquids with flat side walls, bottom and lid, which are connected to one another via fait and / or welding lines, also allows material to be saved compared to conventional paper packs if, according to the invention, an elastic plastic film in sheet form pulled off a first supply roll and, in parallel, pulled off a stiff plastic sheet from a second supply roll, profiled, separated into stiffening plates and the stiffening plates are sealed onto the elasti-30 see plastic film at a mutual distance, then the combined sheet is set up in a U-shaped cross section and is pressed, welded and separated to form open packs on the end faces thereof, whereupon the pack is sealed and removed after filling. 35 Despite the material-saving creation of a liquid pack from two different rigid materials, continuous production and conveyance is possible. With an appropriate design of the individual work stations, a considerable performance of such a packaging machine can be guaranteed. It is interesting to seal the individual stiffening plates at a distance from one another on a sheet of elastic plastic film, for example, which is drawn underneath, because this creates a combined sheet which has partially very elastic areas 45 and sometimes very firm areas. If one considers the formation of a single pack, each stiffening plate in the conveying direction of the combined web is provided in front of and behind it with a certain strip of the elastic plastic film, which later forms the end wall panels. The stiffening plate located between them can thus form the framework of the pack, while the elastic plastic film practically represents the liquid-tight skin.

It is particularly advantageous according to the invention if, when setting up the combined web in a U-shape, a plastic carrier tape is drawn in and moved parallel to the web conveying direction and, after being compressed, is welded and severed at the end faces of the pack. The advantages of a pack with such a carrier tape have already been mentioned above. The welding of the carrier tape into the material of the elastic plastic film on the end faces of the pack is particularly inexpensive and simple as a result of these measures according to the invention, because the compression is practically the sealing 65 of the pack on the end face, forming the end face wall panels. If a separation welding device is used, the carrier tape can be made of plastic just like the longitudinal track, which at this point is made of elastic art

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Fabric film is ordered, welded and separated on its own, so that the newly created packs are separated by this separation welding.

In an advantageous further embodiment of the invention, at the free end of the U of the stiffening plate, a wall field is articulated to it via a bending line, which is larger than half the area of the bottom or lid, and the elastic plastic film stands for the formation of a sealing seam on the bottom or lid a little 'beyond' the free ends of the stiffening plate. In this way, the lid or base, which is made from the two wall panels, can be made by simply folding in and connecting the halves together. In this way, the framework for the pack is created, and the tightness is created by welding the skin lying around on the outside (the elastic plastic film), namely with the sealing seam, which can be produced in a simple manner by covering the material of the elastic plastic film the free ends of the stiffening plate protrude; by an amount that just allows the production of the sealed seam without using too much material.

If one wants to increase the performance of the packaging production machines, then according to the invention it can be provided that, according to a further embodiment, the webs pulled off the supply rolls for the parallel production of several packagings simultaneously have a multiple width of a simple web. Although one can easily imagine running several processes of the type described above in parallel with one another, the two webs drawn off from the supply rolls for the production of a packing line can be widened many times over and when the holding, shaping and sealing stations are arranged individual packaging machines can be cut in between. The entire machine can then be supplied with the production material more easily because large supply rolls are easier to handle than a large number of smaller supply rolls.

Further advantages and possible uses of the present invention result from the following description of a preferred exemplary embodiment in conjunction with the drawings. Show it:

FIG. 1 is a perspective view of a schematic view of the liquid pack according to the invention with a carrying band indicated by dashed lines,

FIG. 2 shows a view similar to that in FIG. 1, but showing no inner parts (carrying strap) but instead a grip strap and opening device,

FIG. 3 shows a view similar to FIG. 2, but with the package rotated and the other end wall or side wall being visible,

FIG. 4 shows schematically the individual activities in the manufacture of the pack,

FIG. 5 shows a perspective and broken-off individual view in the area of the first pack, which has just reached position V,

FIG. 6 shows a schematic sectional illustration through FIG. 5 along the line VI-VI,

7 (a) and (b) show a schematic plan view of the production line of FIG. 4 at the point designated VII,

Figure 8 is a schematic cross-sectional view in station VIII of the production line according to Figure 4 and

FIG. 9 schematically shows the top view of a double production line, in which, however, the rear singling, filling, closing station etc. are not shown.

The packaging shown in perspective in FIGS. 1 to 3 consists of the side walls 1 to 3, the large rear side wall not being visible. The bottom is also not visible, but the lid 4 with the triangular flaps 5 can be seen. While the lid 4 is shown in a very simplified manner in FIG. 1, there is a dashed line 6 made of plastic in the middle of the pack. This runs approximately in the middle of the pack in the middle of the filling material and is welded to the front side panels 1 and 2, which consist only of the elastic plastic film, along the sealing seams 7 and 8. There is a further sealing seam 9 in the lid 4 at the top. All sealing seams 7, 8 and 9 are produced by connecting the elastic plastic film which forms the entire outer skin of the pack. Backed up with stiffer material parts are only the large side wall panels 3 (or the opposite side wall panel, which is not provided with a reference number and is invisible) and cover 4 and base.

FIG. 2 also shows a grip tape 10 and an opening tab, generally designated 11, which can be produced by means known per se and are not of further importance for the invention. Finally, one can also see the upper longitudinal fold lines 12 and 13, via which the cover 4 is connected to the adjacent side walls 3 (or the invisible opposite side wall).

The more precise structure of the pack can best be obtained from the description of the manufacturing process, starting from FIG. 4. There one sees a first supply roll 14, from which a web 15 of an elastic plastic film is pulled off and moved in the direction of arrow 16. Parallel to it in the web conveying direction 16 and, as shown in FIG. 4, to the left in front of the first supply roll 14 is a second supply roll 17, from which a stiffer plastic web 18 is pulled off, which is already partially provided with holes 19, treated with heat at the station 20, is profiled at station 21 to achieve better rigidity, especially since the plastic sheet with a profile could not be wound on the supply roll 17, cut through at 22 to separate stiffening plates 23 and in station 24 if necessary with further heating according to arrow 25 down to the elastic plastic sheet 15 is placed and sealed there. In the area of station 21, for example, fold lines can also have been embossed. These measures form a stiffening plate 23, which practically forms the framework of the package that will be manufactured later.

After sealing in the station labeled I in FIG. 4 below, the grip strip or handle 10 can also be applied, and if the thus combined web 26 is conveyed further in the direction of the arrow 16, the bottom in the center in FIG II designated station a tear tab for the opening device 11 are attached, which is not important for the present invention.

The combined web 26 with the elastic plastic film 15 and the stiffening plates 23, which are arranged at a distance from one another, is thus moved on in the web conveying direction 16. A plastic carrier tape 6 is inserted from the side via a roller 27 into the middle between the two legs of the now U-shaped folded web 26. In this way, the position indicated by V in the upper middle in FIG. 4 is reached, which is broken off and is more clearly shown schematically in FIG. In this state of manufacture, one can see the U-shaped combined web 26 with the stiffening plates 23 which are arranged at a distance from one another in the conveying direction 16 and which are also folded in a U-shape, and the intermediate parts which only consist of the web 15 of the entire length elastic plastic film best5

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hen. This web 15 later gives the liquid-tight skin for the pack. At the free ends of the U-shaped stiffening plate 23, it protrudes a little upwards at 28, as can be seen particularly clearly from FIGS. 5 and 6. This later creates the upper sealing seam, which preferably comes to rest on the bottom, that is to say the sealing seam 9 in the cover 4 is diametrically opposite.

If the material web has now reached position VII in the course of production, the further method is particularly clear from the top view according to FIG. 7. The elastic plastic sheet 15 and the reinforcement strips 23 arranged on the inside can be seen again. According to the arrows 30, a tool (not shown) is now inserted between two adjacent reinforcement plates 23, and the elastic plastic sheet 15 is thereby pressed together and welded at the point 31, so that this weld at 31 later forms the sealing seam 7 or 8. The front package in front of the insertion and compression point 30 is thus closed at the front and rear (but open at the top), and the package arranged behind the compression point 30 is only closed at the front, i.e. only one of the two end faces is closed.

Since the compression and welding according to arrows 30 is a separating welding station, the individual packs which are closed at the front and rear are also isolated. This is illustrated more clearly by the right part (b) of FIG. 7, in which the individual pack is shown somewhat at a distance from the web end according to part (a) of FIG. One can now also see the triangular fields 5 'which have arisen from the compression at the bottom of the pack and which are cut off at point 32 (FIG. 4). The product,

e.g. Milk or fruit juice, filled into the package, which is closed at the bottom and all around, but still open at the top up to level 33. Then the sealing takes place at the top in a manner known per se, with the volume of the pack decreasing according to the arrows 34 machine stamps, so that the sealed pack is finally free of air.

The pack has now reached position VIII in the production line according to FIG. 4. A cross-sectional view of this position VIII is shown in Figure 8. The arrows 34 show 10 how machine stamps, not shown, can move together. At the same time, sealing jaws, not shown, move together according to the arrows 35 in order to create the sealing seam in the area of the double material strip 28 at the top, which can form the seam in the bottom, for example, the sealing seam 9 in the Dec-15 angle 4 if one assumes that the package is turned upside down after leaving position VIII. FIG. 8 also shows the tabs 36 for forming handle supports, which are directed towards one another in pairs and lie transversely to the 20 side wall panels 3.

FIG. 9 shows how two production lines are arranged directly next to one another. The supply roll 17 'shown there illustrates the double width of the stripped sheet of the stiffer plastic in the direction of arrow 16. Below this is the non-visible supply roll with the elastic plastic sheet 15, which is also referred to as the combined sheet 26 in the right area, because In the right half of FIG. 9, the individual stiffening plates 23 are already sealed and are transported together with the elastic plastic film 15. The rest of the production takes place in the same way as described above, only twice at the same time.

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Claims (10)

671 557 1. Packing for liquids with flat side walls (1 to 3), bottom and lid (4), which are connected to each other via fait (12, 13) and / or welding lines, characterized in that all outer surfaces of the pack are made of a film ( 15) are made of elastic plastic and only the bottom, cover (4) and two side walls (3) are additionally deposited with a stiffening plate (23) made of plastic or of at least partially coated stiff paper material. 2. Packaging according to claim 1, characterized in that a carrier tape (6) is mounted running across the pack. 2nd PATENT CLAIMS 3. Packaging according to claim 1 or 2, characterized in that the stiffening plate (23) is profiled and at least partially sealed with the elastic plastic film (15). 4. Packaging according to one of claims 1 to 3, characterized in that the two with the stiffening plate (23) backed side walls (3) opposite each other and the carrier tape (6) at a distance from these side walls (3) and arranged parallel to them and is sealed with the elastic plastic film (15). 5. Packaging according to one of claims 1 to 4, characterized in that a sealing seam (7-9) is provided centrally in the lid (4) and centrally in the two side walls (3) without stiffening plate (23). 6. Packaging according to one of claims 1 to 5, characterized in that tabs (36) are folded out from opposite side wall panels (3) of the stiffening plate (23) to form handle supports, which are directed towards one another in pairs and transversely from these side wall panels (3) protrude (Fig. 6). 7. A method for producing a packaging for liquids with flat side walls (1 to 3), bottom and lid (4), which are connected to one another via fait (12, 13) and / or welding lines, characterized in that an elastic plastic film ( 15) drawn off in a web form from a first supply roll (14) and, in parallel, from a second supply roll (17), a stiff, at least partially plastic-coated paper or a stiff plastic sheet (18), profiled (21), separated into stiffening plates (23) and the stiffening plates (23) are sealed (24, 25) onto the elastic plastic film (15) at a mutual distance, then the combined web (26) is set up in a U-shaped cross-section and forms open packs on the end faces (1, 2 ) is compressed (30), welded and separated, whereupon after filling (32) the package is closed (35) and removed (Fig. 4 to 8). 8. The method according spoke 7, characterized in that when setting up the combined web (26) in a U-shape, a plastic carrier tape (6) is drawn in and moved parallel to the web conveying direction (16) and after compression on the end faces (1,2 ) the package is welded and cut with these. 9. The method according to claim 7 or 8, characterized in that at the free end of the U of the stiffening plate (23) via a bending line (12, 13) a wall panel (3) is articulated thereon, which larger than half the area of the floor or cover (4), and that the elastic plastic film (15) for the formation of a sealing seam (9) protrudes a bit beyond the free ends of the stiffening plate (23) (Fig. 6). 10. The method according to claim 7, characterized in that the webs (15, 18) drawn off from the supply rolls (14, 17) for the parallel production of a plurality of packagings simultaneously have a multiple width of a simple web (FIG. 9).