DE3606712A1 - Packaging for liquids and method for its production - Google Patents

Abstract

A packaging for liquids is described, having flat side walls (2, 3), bottom and lid (4), which are connected to one another via fold lines (12, 13) and/or weld lines. In order that, despite maintaining the necessary rigidity, better utilisation of the material required for the manufacture of the package is guaranteed, it is proposed according to the invention that all the outer surfaces of the package are formed from a film of elastic plastic and only the bottom, lid (4) and two side walls (3) are additionally provided with a reinforcing panel made of plastic and, if appropriate, a support strap (6) is provided inside the package. <IMAGE>

Description

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

Box packs for milk or fruit juices are known, the made of plastic coated on both sides material, e.g. Paper or cardboard. These cuboid liquid packs have on the bottom and Cover two double walls opposite each other triangular fields after filling and closing the packaging folded around the adjacent bending line and on the side wall or the lid or bottom are sealed. Such liquid packs can in High-performance machines (large quantities per unit of time) manufactured, transported well and have the ver various opening devices by the end user are more or less easy to use.

Since the known liquid packs are one away packaging, the aim of the pack goes medium manufacturers there, that per packaging unit to keep material used to a minimum. For opening and hand at least have such a liquid pack the side panels have a certain stiffness so that you can can grasp, lift and turn the pack while doing so Sloshing out of the contents is avoided. They also have to thus stiff side walls with a certain strength be kept apart because otherwise all handling advantages will be nullified. That's why you have Always use a paper of a certain stiffness in order to to meet the above conditions. It understands for the specialist that the double-walled triangle fields or other tabs, for example with the double cardboard strips for the sealed seams one such  stiff material is superfluous and therefore a loss represents. On the contrary, when folding multilayer flaps, Cardboard strips or triangular fields are even leakproof problems.

The object of the invention is therefore to improve one Packaging and its manufacturing process in that that despite maintaining the necessary rigidity a better use of it for the creation of the pack required material is guaranteed.

For the liquid pack itself, it becomes this task solved according to the invention in that all the outer surfaces of the Package made of a film made of elastic plastic det and only the bottom, lid and two side walls additionally with a stiffening plate made of plastic are deposited. The liquid created in this way keitpackung thus contains no use as a carrier material detes paper or cardboard, especially the stiffening plate te is preferably made of plastic. Nevertheless but you can also imagine that the stiffening plate made of at least partially coated rigid Pa pier material is made. The invention is in fol but in connection with a stiffening plate Plastic described and this material is preferred because it works especially well in high-performance machines can be processed.

The novelty of the pack according to the invention is the deed thing that not all six fields of a square pac kung but only four of them from the more elaborate, stiffer material. The remaining two wall panels, for example the front side walls of a river liquid pack, are only from the invention elastic plastic formed, e.g. as a film very much is inexpensive commercially available and easy to process. This way you have compared to those made from paper webs manufactured liquid packs a not inconsiderable  che material saving, the more significant since it liquid packs are generally a mas product. All wall fields of the invention Pack can be correct in terms of material usage be dimensioned. So far in the state of the art oversized boxes for the tabs, cardboard strips or double triangular fields are advantageously omitted.

A preferred embodiment of the Ver Pack is characterized in that across the A tape is attached to the pack. Ver is used as a particularly thin plastic ne film, then there is after filling the fiction the possibility of bulging and thus Transport and stacking problems. This bulging can can be avoided by a carrier tape, which preferably from one end wall surface to the opposite The only thing that runs is the elastic art side wall panels formed so that this too Packing walls provided without stiffening plates are practical no longer bulge. The rectangular shape of the new pack is therefore also guaranteed when using thin plastic films accomplishes.

It is also advantageous according to the invention if the Stiffening plate profiled and at least partially with the elastic plastic film is sealed. This too Measure serves to save material because namely even the plastic sheet to create the stiffening plates can be made thinner if beads, rip pen, creases, grooves or other types of profiles this stiffer plastic sheet ensure that strong stiffening even with thin material can create plate. By sealing the stiffener tion plate with the elastic plastic film can be handle all of the material better during manufacture and further increases the strength of the finished package.  

In a further advantageous embodiment of the invention lie the two with the stiffening plate Sidewalls opposite each other, and the strap is in the Distance from these side walls and parallel to them orderly and sealed with the elastic plastic film. These measures already result in the above indicated embodiment in which the material with the Stiffening plate cover and base and two each other opposite, connecting lid and bottom Forms side walls, while the front side walls without stiffening plate only made of elastic plastic foil exist. In this plastic film a if the carrier tape is made of sealable plastic sealed and thus between the front sides walls kept tense. This tape is located in the middle of the product, affects the product but in no way, because its material is for the be relevant filling practically inert. The new liquid pack receives additional rigidity due to the carrying strap, which is particularly optimized when another advantageous embodiment of the invention in the middle of Dec in the middle and in the two side walls without stiffening plate a sealing seam is provided. Not in the Covered sealing seam, which is in the opposite overlying, front side walls are the carrier tape is welded in. This makes it easier and ver making the liquid pack easier, because at the same time as closing the front Sidewalls also the strap is welded. Especially it is appropriate to use so-called separators welding tools.

It is also expedient according to the invention if from ge opposite side wall panels of the stiffening plate tabs are folded out to form handle supports, which are facing each other in pairs and across stand out from these side wall panels. The stiffening plate, which is the large side panel of the new liquid  keit pack should have sufficient strength and Stiffness, especially through the profiles, so that cutting out a flap and unfolding it across from the sidewall field no impairment of the for handling of the pack required stiffness points. Since you have opposite side wall panels with the Reinforced stiffening plates, you can on any forehead these pairs of tabs facing each other steer so that when gripping the pack in the area this tab also forms a handle support so the pack becomes difficult to handle, e.g. pouring out also not significantly deformed by the grip pressure. As a result, the pouring is carried out in an exact pouring stream different.

The process of making the packaging for liquid with flat side walls, bottom and lid that over Folding and / or bending lines are connected to one another, also allows saving material compared to the conventional paper packs, if according to the invention an elastic plastic film in the form of a web he most supply roll pulled off and in parallel from one pulled off a stiff plastic sheet from the second supply roll, profiled, is stiffened in stiffening plates and the Stiffening plates spaced apart from each other on the ela Plastic plastic film are sealed, then the united path in cross-section U-shaped and forming open packs on the tops of their faces is squeezed, welded and isolated, whereupon After filling, the package is closed and removed is changed. Despite the material-saving creation of a Liquid pack made of two different rigid materials alien is thus the continuous production and promotion possible. With appropriate design of the individual workstations can take a considerable amount of effort such packaging machine can be guaranteed. Interesting is the sealing of the isolated stiffening plates at a distance from each other, for example below  passing web of elastic plastic film, because this creates a united path that partially very elastic areas and sometimes very firm areas Has. If you look at the creation of a single pack, then each stiffening plate in the conveying direction is the united web before and after with a certain Provide strips of elastic plastic film, the late ter forms the front wall panels. The in between located stiffening plate can thus the framework of the Pack form practically while the elastic plastic film represents the liquid-tight skin.

According to the invention, it is particularly advantageous if a load when setting up the combined path in a U-shape band drawn in plastic and parallel to the web conveyor the direction and after compressing the End faces of the pack are welded to and through is separated. The advantages of a pack with one Carrying tape has already been mentioned above. The welding of the Carrying tape in the material of the elastic plastic film at the end of the pack is fiction through this appropriate measures particularly cheap and simple, because that Squeezing is practically closing the package on the front side with formation of the front wall panel the. If a separation welding device is used, the plastic carrier tape as well as the longitudinal track, which at this point is made of the elastic plastic film exists alone, welded and separated, so that through this separation welding the separation of the newly created packs.

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 is, and the elastic plastic film stands for the bil a sealing seam on the bottom or lid a bit beyond the free ends of the stiffening plate. On  this way the lid or bottom made up of the two Wall panels is made by simply clicking in Pen and connect the halves together be put. In this way, the framework for the Pac kung created, and the tightness is ver welding the skin around the outside (the elastic Plastic film) created, namely with the sealed seam, which can be manufactured in a simple manner, that the material of the elastic plastic film over the protrudes free ends of the stiffening plate; in fact by an amount that is just producing the sealed seam allowed without using too much material.

If you want the performance of the packaging machine increase, then you can provide according to the invention that ge according to a further embodiment, that of the supply rolls deducted webs for the parallel production of several Packaging at the same time a multiple width one fold track. It's easy to imagine several methods of the type described above in parallel to let each other run off, the two of the supplies roll peeled webs for creating a pack line can, however, be widened many times over and in arranging the posture, molding and sealing stations of the individual packaging machines be cut. The entire machine can then easier to be supplied with the manufacturing material, because large supply rolls are lighter than a variety of smaller supply rolls are to be handled.

Further advantages, features and possible applications of the present invention result from the following Be description of a preferred embodiment in Ver binding with the drawings. Show it:

Fig. 1 shows in perspective a schematic view of the flues sigkeitspackung according to the invention with an indicated dashed fastener tape,

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

Fig. 3 is a view similar to Fig. 2, but wherein the pack is inverted and the other end-side wall surface or side wall is to be seen,

Fig. 4 schematically shows the different activities in the forth position of the pack,

Fig. 5 is a perspective and fragmentary view Einzelan in the region of the first pack that has just reached the position V,

Fig. 6 is a schematic sectional view through Fig. 5 taken along line VI-VI,

Fig. 7 (a) and (b) is a schematic plan view of the production line of Fig. 4 recorded on the BE with VII point,

Fig. 8 is a schematic cross-sectional view in the VIII station of the production line of FIG. 4 and

Fig. 9 shows schematically the top view of a production double line, but in which the rear singling, filling, sealing station, etc. are not shown ge.

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 cannot be seen either, but the lid 4 with the triangular flaps 5 can be seen . While the cover 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 package. This runs approximately in the middle of the pack in the middle of the filling material and is welded to the front side tenfelder 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 top cover 4 . All sealing seams 7 , 8 and 9 are created by connecting the elastic outer plastic film forming the entire outer skin of the pack. Backed 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 bottom.

In Fig. 2, a grip tape 10 and a general my 11 designated opening tab are shown, 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 seen 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 . In parallel in the web conveying direction 16 behind it and as shown in Fig. 4 to the left of the first supply roll 14 there is a second supply roll 17 , from which a stiffer plastic web 18 is pulled off, which is already partially provided with holes 19 , at the station 20 with heat treated, is profiled at station 21 to achieve a better stiffness, especially since the plastic sheet with profile could not be wound on the supply roll 17 who could cut through at 22 to separate stiffening plates 23 and in station 24 if necessary with further heating in accordance with Arrow 25 placed down on the elastic plastic sheet 15 and sealed there. In the area of station 21 , for example, fold lines can also have been embossed. Through these measures, a stiffening plate 23 is formed, which practically the structure of the pack, which 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 arrow 16 , the bottom in FIG a tear-open tab for the opening device 11 are attached to the center designated II, 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 further 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 marked V in FIG. 4 at the top in the middle is reached, which is broken off and is shown more clearly in FIG. 5. It can be seen in this manufacturing state the U-shaped united web 26 with the stiffening plates 23 arranged in the conveying direction 16 at a distance from one another, which are also folded in a U-shape, and the intermediate parts, which only consist of the web extending over the entire length 15 of the elastic plastic film exist. This web 15 later gives the liquid-tight skin for the pack. It stands at the free ends of the U-shaped stiffening plate 23 at 28 a little way upwards, 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 proceeds particularly clearly from the top view according to FIG. 7. The elastic plastic web 15 and the reinforcement strips 23 arranged on the inside can be seen again. Accordingly, the arrows 30 , a tool, not shown, is now inserted between two adjacent reinforcing plates 23 , and as a result the elastic plastic web 15 is compressed and welded at the point 31 , so that later this seam at 31 will seal you 7 or 8 forms. The front pack in front of a leading and squeezing point 30 is thus closed at the front and rear (but open at the top), and the packing located behind the mating pressing point 30 is only closed at the front, ie only one of the two end faces is closed.

Since it is a separation welding station when compressing and welding in accordance with arrows 30 , the individual packs sealed at the front and back are also isolated. This is illustrated more clearly by the right part ( b ) of FIG. 7, in which the singular pack is shown somewhat at a distance from the web end according to part ( a ) of FIG. 7. One can now also see the triangle fields 5 'which are created by the compression at the bottom of the pack, which are cut off at point 32 ( FIG. 4). Via the filler tube 32 , the product, for example milk or fruit juice, is filled into the bottom and around the closed but still open package up to the level 33 . Then the closure takes place in a manner known per se, whereby according to the arrows 34 machine stamps reduce the volume of the package, so that the sealed package 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 Fig. 8. The arrows 34 indicate how machine stamps, not shown, can move together. At the same time, not Darge presented sealing jaws together according to the arrows 35 to create the seam in the area of the double material strip 28 at the top, which, for example, can form the seam 9 in the lid 4 opposite seam in the bottom if one assumes that the package is turned upside down after leaving position VIII. In Fig. 8, it also recognizes the 36 plates to the formation of the handle supports, which are facing to each other in pairs and are transverse to the side wall zones 3.

In Fig. 9 it is shown how two production lines are arranged di right next to each other. The supply roll 17 shown there illustrates the double width of the stripped web of the stiffer plastic in the direction of the arrow 16 . Below this is the invisible supply roll with the elastic plastic web 15 , which is also referred to in the right area as a combined web 26 , 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 . Otherwise, the production is carried out in the same manner as described above, but only twice at the same time.

Claims (10)

1. Packaging for liquids with flat side walls ( 1 to 3 ), bottom and lid ( 4 ), which are connected by folding ( 12 , 13 ) and / or welding lines, characterized in that all outer surfaces of the Pac Kung from a film ( 15 ) are made of elastic plastic and only the bottom, cover ( 4 ) and two side walls ( 3 ) are additionally backed with a stiffening plate ( 23 ) made of plastic. 2. Packaging according to claim 1, characterized in that a carrier tape ( 6 ) is mounted running across the pack. 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 te ( 23 ) deposited side walls ( 3 ) lie opposite one another and the carrier tape ( 6 ) at a distance from these side walls ( 3 ) and parallel to these arranged and 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 from opposite side wall fields ( 3 ) of the stiffening plate ( 23 ) to form handle supports tabs ( 36 ) are folded out, the pair are directed towards each other and transversely from these side wall fields ( 3rd ) 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 each other via folding ( 12 , 13 ) and / or welding lines, characterized in that a elastic plastic film ( 15 ) in the form of a web is pulled off a first supply roll ( 14 ) and, in parallel, a rigid plastic web ( 18 ) is drawn off from a second supply roll ( 17 ), 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 pressed together to form open packs on its end faces ( 1 , 2 ) ( 30 ), welded and separated, whereupon after filling ( 32 ) the pack is closed ( 35 ) and conveyed off ( Fig. 4 to 8). 8. The method according to claim 7, characterized in that when setting up the combined web ( 26 ) in a U-shape, a carrier tape ( 6 ) drawn from plastic and moved parallel to the web conveying direction ( 16 ) and after pressing together on the end faces ( 1 , 2 ) the pack with which it is welded and cut. 9. The method according to claim 7 or 8, characterized in that at the free end of the U stiffening plate ( 23 ) via a bending line ( 12 , 13 ) a wall field ( 3 ) is articulated on this, which is greater than half Surface of the bottom or lid ( 4 ), and that the elastic plastic film ( 15 ) for the formation of a sealing seam ( 9 ) is a bit far beyond the free end of the stiffening plate ( 23 ) ( Fig. 6). 10. The method according to claim 7, characterized in that from the supply rolls ( 14 , 17 ) deducted webs ( 15 , 18 ) for the parallel production of several packagings at the same time have a multiple width of a simple web ( Fig. 9).