DE2302484A1 - FOLDING BOX FOR LIQUIDS OD. DGL - Google Patents

Description

PATENT Attorney DIPL.-ING. H. STRAW BAR

8000 MUNICH 60 MUSÄUSSTRASSE 5 TELEPHONE (0811) 881608

23Q2484

19.1.1973-SLa (5) 188-1045P

Christenssons Maskiner & Patenter Aktiebolag tkbacksvägen_32 to 34, S-161 30_Stockholm-Dromma_ £ Sweden)

Folding box for liquids or the like.

The invention relates to a folding box rectangular Cross-section for liquids or the like. with one with the formation of folding triangles and one connecting them, in particular Zürn tight closure by a weld certain outer web back closed lining hose and at least above four flaps made of other material from the rest of the box, one of which is located in the area of the one folding triangle is independent of the neighboring ones on both sides and that when the picking is open and protruding upwards from the feed tube can still be surmounted upwards, as well as a method for closing such a folding box.

For example, if milk is to be packed in carton-based cartons, a number of conditions must be met be rubbed a pleasing appearance of the packaging, the folding box should be easy to handle and, in particular, easy to open be. It should also be stackable if possible, which has a rectangular cross-section in all three dimensions Folding box assumes, and it should in any case be so reliably sealed that it is also with remains tight after careless handling. ·

Ice cream to this day is still no such packaging for

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Milk has become known that meets all of the above conditions una can also be produced at a reasonable cost.

The known packaging for liquids, which is comparable to this day have the disadvantage that they are either not sufficiently tight from the start or at least after a short time Time to leak. Closer investigations have shown that the tendency to leakage is mainly due to the nature of the Closure of the packaging previously filled with a liquid is required. Folding boxes that meet all of the aforesaid conditions up to meet the condition of a sufficient tightness, were usually made with a thin plastic skin-coated cardboard material. The waterproofing the folding box at its closure was either waxed, but this does not guarantee reliable tightness, or brought about by plastic welding, which in some Respect results in a more reliable tightness of the folding box.-This is not to be understood in such a way that every carelessly handled filled carton already leaks, but in such a way that with careless handling, too large a proportion of the filled and closed packaging of this type still leaks will.

On the other hand, of course, it cannot be fundamentally changed that the folding boxes concerned here also in the case of one completely tight closure cannot guarantee permanent tightness in the event of rough handling, e.g. then, if when unloading such folding boxes a box against a pointed object, a sharp corner or edge of a board or the like. should come across. A leak caused by this can not be prevented by an originally completely tight closure of the folding box and can of course occur in the same way in the case of previously sealed and previously unsealed folding boxes. The fixed to the previously known comparable folding boxes

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Rather, they only concern such leaks, either through faulty packaging material or at overlapping points of the packaging material caused by the production of the folding box or by errors in closing the already filled packaging.

Investigations on folding boxes that are already filled and ready for dispatch have shown that the leaks in the vast majority of cases Cases at the sealing points between adjacent wall surfaces the folding box. Even with such folding boxes, the cardboard material with a weldable plastic skin coated or covered with a plastic film is not just about the correct welding of the plastic Welding temperature, but also to ensure that the welding process is limited to a certain short period of time remain. In other words, only a certain amount of heat may be supplied, the size of which is proportional to the amount of material that absorbs the heat of welding. When welding plastic-coated cardboard material, it cannot be avoided ate the heat beyond the plastic layer also into that Cardboard material itself and to a certain extent also into the packaged goods located in the folding box.

In the present invention, it is therefore assumed that aa £ the component of the folding box that is during the closure is heated, is as small as possible, which at the same time reduces the amount of heat to be supplied and practically exclusively is available for the welding process.

According to the above, the folding box should be made from a cardboard material exist, which, if desired, can also be coated with a plastic layer, but this should be immediate The plastic layer adhering to the cardboard material does not participate in the welding process to seal the folding box tightly. The one that was welded to close the filled folding box Rather, plastic material should come from a feed tube made of a thin, liquid-tight plastic film

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exist which is weldable and which are independent at the welding point from the cardboard material or similar material of the folding box. It follows that the carton is only then closed if the feed tube has already been tightly closed, i.e. the closing process must be carried out in two successive steps Steps. Such a known folding box is described in FR-PS 1 19 3 500, for example. Unsolved However, the problem with this known packaging is that the lining tube, which is tightly closed by the welding, is connected to close together with the upper flaps of the folding box so that the folding box is "ready for use later." the simplest possible handling can be opened so that at the same time a suitable spout for pouring out the contents of the Folding box is formed.

The object set is achieved according to the invention in that the two closing flaps running along the back of the web are only one half of them measured across the back of the web Have box width corresponding width.

As a result, they differ from the aforementioned prior art Training of the flaps creates the possibility of the back of the lining tube through to let the two already-closed flaps mentioned protrude through, which is a decisive one Simplification for a later reopening of the packaging means.

According to one embodiment of the invention, a closure flap located at one end of the web spine is connected to both sides subsequent closure flaps connected via a folding line, which is what the later reopening of the packaging Formation of a pouring spout favors.

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According to a further, preferred embodiment of the invention, the closing flap connected to the adjacent closing flaps has two folding lines running from the two corners of the folding box assigned to it to the middle of its outer edge which continue to favor the formation of a spout when the carton is opened again.

In yet another embodiment of the invention the two closing flaps adjacent to the aforementioned middle closing flap are each one of the one with the middle closing flap common corner of the folding box to the middle of its outer edge running fold line on what when reopening the folding box further favors the formation of the pouring spout, namely when both sides of the spout to be formed located side walls of the box in a manner known per se, for example from US Pat. No. 2,982,461 will.

According to a further embodiment of the invention, the folding box an adhesive strip or the like. for easily detachable fixing of the associated folding triangle and the following part of the web spine is assigned to the outwardly downwardly folded closure flap on the side wall of the box there. If at Closing the folding box the closing flap opposite the closing flap which has been folded down in the aforementioned manner folded up onto the top edge of the box and set there, then this results in a without any further tight closure of the folding box, although in the event of a later detachment of the adhesive strip and one then tearing off what was previously held by the adhesive tape Part of the spine and a slight lateral compression of the folding box the desired pouring spout is practically formed by itself.

The last-mentioned tearing off of a part of the spine is continued according to yet another embodiment of the invention.

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Relieved when the back of the bridge is close to the outside Edge of the said middle flap opposite and inwardly on the one hand in the plane of the upper edge of the folding box, folded over the back of the folded closure flap located point one of its outer edge over a possibly existing weld seam Has part of its width extending incision.

Other specific embodiments of the invention relate to further structural details of the folding box according to the invention.

The invention also includes a method for closing the box, in addition to the actual design of the folding box Folding box according to the invention, which consists in that after the formation of the folding triangles and the spine initially the closing flaps running on both sides of the same with the remaining closing flaps folded outwards against one another can be folded up to the box-side edge of the bar spine protruding upwards and outward between the flaps and then the back of the web, which may have previously been tightly sealed by a weld seam, to one side on the upper one The edge of the box is folded up, whereupon that of the neighboring independent remaining closure flap with the associated folding triangle and web back part inwards on the upper one Folded box edge and set on it and finally the remaining flap together with the associated folding triangle together with the spine part folded outwards and downwards onto the associated side wall of the folding box and is attached to it in an easily detachable manner.

In the drawing, the invention is illustrated by way of example; show it:

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Fig. 1 oen intended to form the folding box at his Inside already provided with a lining tube Folding box blank in an external view;

2 shows a corresponding view of the already glued together to form a hollow profile, but still folded flat Folding box blanks;

3 shows a rear view of the not yet unfolded folding box shown in FIG. 2;

Fig. 4 shows the upper part of the fully unfolded and already filled and in a closed box along the upper back of your feed tube perspective held view obliquely from above;

FIG. 5 is a view corresponding to FIG. 4, according to which the FIG The back is folded up onto the outside of the one closed side flap that runs along it and apart from the two side flaps also those at the place of a folding triangle of the lining tube located third flap is closed;

6 shows a similar view, according to which now the rest of the closure flap with the part running along it of the ridge to the outside down to the side wall of the folding box there and through a Adhesive tape is held in this position;

FIG. 7 shows a representation similar to FIG. 6, in which the folding box, however, after the adhesive strip has been removed and tearing off the thereby exposed part of the web spine was opened to form a pouring spout.

The folding box blank shown in Fig. 1, on the inside of which is already made of a liquid-tight plastic film existing feed tube 10 is in the rest of four side walls 11, 12, 13 and IU adjoining one another in the circumferential direction of the box, with an A side edge of the side wall IH facing away from the preceding side walls is also joined by an adhesive flap 15. Furthermore the named side walls are separated from each other by a fold line 16, 17 and 18 and the adhesive flap 15 from the side wall divided by a fold line 19.

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\ At their lower edges are the side walls in the above Successively provided with closure flaps 20, 21, 22 and 23, which are attached to the associated side walls via a folding line 24 or 25, 26 and 27. In the illustrated embodiment, the flaps 20, 21, 22 and 23 are independent from each other. Apart from the fact that the bottom seal of the actual folding box is also in some other suitable one Wise could be done, it is assumed in the embodiment that the feed tube 10 is also suitable Way, for example by a weld seam, is closed liquid-tight at the bottom. In addition, the lower shutter should be the filled and closed folding box not only reliably liquid-tight, but also be sufficiently rigid so that the carton is not too sensitive to pressure and for example can also be stacked.

At its upper edge it preferably has an outer edge plastic-coated cardboard material following the side walls 12, 13 and 14 · closing flaps 28, 29 and 30, which are laterally consecutive are connected to one another, the fold line 17 between the two closure flaps 28 and 29 by a fold line 3 7 and the fold line .18 between the two flaps 29 and 30 by a fold line 38 is extended. On the rest of the side wall 11 adjoins at the top a closure flap 31 which is independent of the rest in the usual manner. All upper locking flaps otherwise close to the associated side walls in the aforementioned ^ Successive fold lines 39, 34, 40 and 41 at.

So that the closing flaps 28, 29 and 30 are pivoted about their bending lines 3, 9, 34 and 40 when the folded box is closed can be, the middle (29) of the three interconnected flaps also has one of the at the connection-side corners of the folding box to the middle of the

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Fold lines 3 2 and 3 3 running on the outer edge of the closure flap 29, select ¹ en α the closure flaps 28 and 30 which adjoin on both sides also each have a fold line 3 5 and 3 6, respectively. The fold line 35 starts from the same folding box corner as the fold line 3 2 mentioned and ends in the middle of the outer rim of the closure flap 28, while the fold line 36 starts from the same gap as the fold line 33 mentioned and in the middle of the outer edge of the closure flap 30 ends.

Ler feeding tube 10 is in the usual way on the inside oer both side walls 12 and 13 and has adhesive layers on its rear side in the direction of view of FIG. 1 on, so when he continued to unfold the carton, o.h. when folding the two side walls 11 and 14 against each other to the rear and when gluing the adhesive flap 15 to the according to Fig. 1 rear outer edge surface of the side wall 11 at the same time connected to the rear sides egg beiaen side walls 11 and 14 is, this initially creates a hollow profile box part that encompasses the lining tube 10 and is still folded flat, as shown in FIG. 2 in a front view corresponding to FIG. 1 and in FIG. 3 in a rear view.

Should the folded box prepared in this way and ready for dispatch in the flat folded state be further unfolded and, for example be filled with a liquid, so must first, if this should not have already happened before, the Feeding tube JO sealed liquid-tight at its lower Ranü will. This can be done in the usual way by applying a plastic weld seam along the lower edge of the lining tube 10, whereupon the two closing flaps 20 first of all when the box is unfolded to form a rectangular hollow profile and 22 and then the two closing flaps 21 and 23 each against one another in the plane of the bottom of the folding box be folded against or on one another. The last folded two closure flaps 21 and 2 3 at the same time

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glued together, whereupon the folding box already has a rectangular cross-section running over its entire height.

After the subsequent filling, the folding box must now also be closed in a liquid-tight manner at its upper end. This is done in two steps. First, the upper edge of the lining tube 10 is pressed together to form a web 42 and at the same time moved down to the top edge of the folding box, thereby moving to both ends of the spine 42 each forms a folding triangle 43 and 44, respectively. It is useful that the feed tube 10 in the area of its upper Edge is also glued to the closure flaps 28, 29, 30 and 31, whereby when the web spine 2 2 moves downwards the upper edge of the box at the same time the two flaps 2 Close 8 and 30 against each other in the plane of the upper edge of the box and attach the feed tube to the lower edge of the Stegrüekens 42 pinch between them, while those of the remaining flaps independent upper flap 31 on the outside of the folding triangle 44 with this in the off 4 is pivoted outwardly as can be seen. In addition, the downward movement of the web 42 is the the closing flap 31 opposite the closing flap 29 along its folding lines 32 and 3 3 to that of the folding triangle 4 3 aligned Folded in a triangular shape, which also makes that according to Fig. 4 left end of the web spine 42 is clamped at its base between two flap edges, namely through the two halves of the outer edge of the closure flap 29, which now run directly next to one another.

The liquid-tight closure of the lining hose 10 along its web back 42 by making a weld seam can have already taken place before its position shown in FIG. 4, but must take place at the latest in the position shown in FIG. The tightly closed web back 42 according to the exemplary embodiment is now forward into the plane of the upper edge

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of the folding box and then the closing flap 31 on the right according to FIG. 4 together with the folding triangle 44 there and that part of the web back 42 located in their area folded up to the top left on the upper edge of the folding box and in this j from Fig. 5 apparent position by an adhesive or the like. fixed to the rest of the folding box.

The next step in closing the folding box can be seen in FIG. 6. Accordingly, that according to FIG. 5 now becomes left folding triangle 4 3 together with the flap enclosing it 29 folded outwardly down to the local side wall 13 and in this position by means of a dash-dotted line in FIG. 6 indicated adhesive strip 49 on the folding box easily detachably fixed. The packaging is now completely closed and intended for both dispatch and delivery to the end user. The folding box has a total of a cuboid shape with a rectangular cross-section in all three main directions of the box and is therefore easy to stack. Moreover, it not only has a pleasing appearance and is reliable both at its bottom and at its upper edge liquid-tight closed, the web back 42 for closing only one of the plastic material of the lining tube there 10 needs to be supplied to the welding heat bringing heat, but the folding box can also be very just open it again so that a suitable pouring spout is formed at the same time.

To reopen the folded box closed in the aforementioned manner, the adhesive strip 49 is first peeled off, whereupon the closing flap 29 with the folding triangle 43 enclosed by it and the part of the web 42 located on it due to the inherent elasticity of the cardboard and lining tube material by itself in an approximately horizontal direction will pivot above so that these parts will again assume the position shown in FIG. Due to the

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elasticity of the lining hose material, the upwardly pivoted part of the web back 42 is at the same time erected somewhat upwards will. In order to open the carton ready for use, all that remains is to remove it of the adhesive strip 49 exposed part of the web spine 42, which at its base in the manner described between each other facing edge parts of the closure flaps 28, 29 and 30 is clamped, from the rest of the lining tube to one side of the packaging up to the area of the outer edge 45 (cf. FIG. 7) of the closure flap 31 to be torn off.

The folding box is now open in the area of the left half of its top and now only need the two opposite side walls 12 and 14 in their the opening associated, indicated in Fig. 7 by a circle 46 upper area to be pressed slightly against each other, whereby in the area of the closure flap 29 and the adjoining area of the two closure flaps 28 and 30 also through the feed tube 10 results in an approximately rhombus-shaped opening 47.

If the carton is not immediately emptied completely should be, it can easily be closed again sufficiently tightly by reusing the adhesive strip 49, by first turning the opening 47 back into one by applying slight pressure from above on the upwardly projecting closure flap parts narrow slot is closed and the closure flap 29, which again protrudes to the left outside as shown in FIG. 7, goes down again folded up to the side wall 13 and is fixed in this position by the adhesive strip 49 on the side wall 13 again. If the adhesive strip 49, as indicated in FIG. 6, also covers the area of the opening 47, it thereby leads at the same time an airtight seal of the opening 47, which of course no longer needs to be so tight, that the re-closed box could be shipped.

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The tearing off of the left part of the web spine 42 according to FIGS. 6 and 7 can still be carried out with respect to the remainder of the web spine be facilitated by the fact that the web back 4 2 at a according to FIG. 6 close to the outer edge 45 of the folded inward Closure flap 31 located one of its outer Rana over a part of it that leaves the weld seam free Has a wide incision 48 running.

In the case of a plastic coating of the cardboard material Polyethylene is well suited for the coating, although other plastics can also be used. For the feed tube In addition to polyethylene or another similar plastic, some metal foils are also suitable, which is particularly good an aluminum foil coated on the one hand with a polyethylene layer is suitable. The coated side runs the aluminum foil on the inside of the lining tube because Polyethylene is and also can be welded very well and reliably remains firmly attached to the aluminum foil when rolling in the lining tube edge. In addition, polyethylene does not cause anything a change in taste or smell in the lining tube absorbed liquid, so that a folding box lined with such a feeding tube is particularly good for holding drinks,

Patent claims:

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Claims (11)

Claims IJ folding box with rectangular cross-section for liquids or the like, with one under the formation of folding triangles and one connecting them, in particular for a tight seal a welded seam of the outer web back, closed lining hose and at least four at the top made of the material of the remaining box formed closure flaps, one of which is located in the area of a folding triangle regardless of which is adjacent on both sides and with the packaging open and protruding upward from the feed hose still protrudes upwards are, characterized in that the two closure flaps (28 and 30) running along the web back (42) 'each one only half, across the. The width of the box measured on the spine, 2. Folding box according to claim 1, characterized in that a closure flap located at one end of the spine (4-2) (29) is connected to the closure flaps (28 and 30) adjoining on both sides via a respective fold line (37 or 38). 3. Folding box according to claims 1 and 2, characterized in that that the closing flap (29) connected to the adjacent closing flaps (28 and 30) is two of the two associated corners of the folding box has folding lines (32 and 33) running towards the middle of its outer edge, 4. Folding box according to claim 2 or 3, characterized in that the aforementioned middle closure flap (29) is adjacent two Vex-closing flaps (28 and 30) each one of the with the middle flap (29) common corner of the folding box have folding lines (35 or 36) running towards the middle of their outer edge. 309831/0469 5. Folding box according to one of the preceding claims, characterized in that you have an adhesive strip (49) or the like. for easy releasable fixing of the associated folding triangle (43) together with the adjoining part of the web spine (42) outwards and downwards folded flap (29) is assigned to the side wall (13) of the box there (Fig. 6). 6. Folding box according to one of claims 2 to 5, characterized that the web back (42) at a close in front of the outer edge of the said middle closure flap (29) opposite and inward on the web spine (42) which is folded over on one side in the plane of the upper edge of the folding box folded flap (31) located one from its outer edge over a possibly existing The weld seam leaving part of its width extending incision (48). 7. Folding box according to one of the preceding claims, characterized in that it consists of an externally plastic-coated Cardboard material. 8. Folding box according to claim 7, characterized in that its cardboard material is coated with polyethylene. 9. Folding box according to one of the preceding claims, characterized in that the feed tube (10) consists of one on the one hand aluminum foil coated with a plastic film or vice versa. 10. Folding box according to one of the preceding claims 2 to 9, characterized in that the three directly contiguous Closure flaps (28 to 30) adjacent parts of a feed tube (10) are glued to these flaps. 11. A method for closing a folding box according to one of the preceding claims, characterized in that according to 309831/0459 Formation of the folding triangles (43 and 4 4) uric of the bar spine (4 2) initially oie closing flap running on both sides (28 uric 30) with the remaining closure flaps folded outwards (29 and 30) against each other up to the sides of the box There are no flaps on the web that protrudes upwards and outwards (42) and then cer previously a weld seam tightly sealed webs (42) is folded up to one side onto the upper edge of the box, whereupon the remaining independent of αen Closure flap (31) with an associated folding triangle (44) una ctegrCckeiiteil inward on the upper Schachtiran g worked uhü Gdrauf set unc finally the remaining one remaining closure flap (29) associated with ctem Folding triangle (43) together with the piece part folded outwards and downwards onto the associated side wall (13) of the folding shaft] uno oaran is easily detachable. 309831 / O Fig 1? Blank page