SE546017C2 - Packaging for liquid products, a method for filling the package, a method for sterilizing the package and a method for making an inner bag for the package - Google Patents

Abstract

SUMMARYPackaging for liquid foodstuffs and method for filling the packaging, where the packaging has an outer casing (2) of cardboard, an inner bag (8) of plastic film consisting of e.g. fully recyclable bio-polyethylene plastic, where the inner bag is arranged inside the outer casing (2) and completely fills this when the inner bag is filled with the food, and an opening module, here called MF module (12), which contains an emptying direction and a filling direction arranged on a plastic tray (16) and where the MF module (12) is connected to the inner bag (8) by the underside of the plastic tray (16) being welded to the outer side of the inner bag in such a way that the emptying channel (13) is connected to a hole (11 ) in the inner bag (8) and that the filling channel (21) is connected to an opening with a sealing flap (14) in the inner bag (8), and where further the MF module (12) is connected to the outer casing (2) by side edges of the plastic washer (16) connects to the edge tabs (5) and cover (6) of the outer casing (2).

Description

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[0001] The present invention relates to a package intended for light-flowing as well as thick-flowing liquids, in particular for foodstuffs. Furthermore, the invention comprises a method for filling liquid into the package and a method for producing an inner bag arranged in the package to receive the liquid filled into the package.

STATE OF THE ART id="p-2" id="p-2" id="p-2"

[0002] The packaging currently used for containing liquid food cannot be recycled to a sufficient degree. For this reason, a large part of the recycled material from this type of food packaging is used for energy recovery instead of being reused. One reason why existing packaging on the market is currently recycled satisfactorily is that the cardboard used in the packaging is coated with some form of plastic film. id="p-3" id="p-3" id="p-3"

[0003] Packages that are common on the market today can be represented by, for example, that described in document US 6560950 (Bl). Some shortcomings regarding the known package are that they are relatively difficult to open for people who have weakened muscles in the fingers and hands. Caps that must be unscrewed to open the package are separated from the package after opening and can be lost or fall out. After resealing, air has been let into the package, which affects the shelf life of the food content. Even in unopened packages, air is present to an unsatisfactory degree. Up to 7% of the contents of a closed package can consist of air that oxidizes the contents. Furthermore, it is unsatisfactory that it is difficult to empty the package completely of its contents since the package cannot be flattened together sufficiently. id="p-4" id="p-4" id="p-4"

[0004] Packaging that is created according to the prior art from cardboard coated with a plastic film is a technique that is not desirable from an industrial point of view. Paper mills prefer to process raw material from pure cardboard. id="p-5" id="p-5" id="p-5"

[0005] As other examples of prior art, the patents US 3112047 and US 43 DESCRIPTION OF THE INVENTION id="p-6" id="p-6" id="p-6"

[0006] The device according to one aspect of the invention consists of a package which is primarily intended for the content of free-flowing as well as low-flowing foods such as milk, yoghurt, juices and the like. The package is also suitable for transport in an efficient manner. The invention also includes a method for filling contents into the package. id="p-7" id="p-7" id="p-7"

[0007] The packaging consists of three parts, an outer casing of cardboard, an inner bag in the form of a plastic foil, and a multifunctional opening module. id="p-8" id="p-8" id="p-8"

[0008] As mentioned, the outer casing is made of cardboard that is 100% recyclable. By 100% recyclable is meant that the approximately 90% paper fiber that constitutes the supporting material in the cardboard can be completely recycled. The remaining 10% of the cardboard consists of moisture and filler and glue residues that are not interesting from a recycling point of view. The cardboard material is preferably made of recycled paper fibers. The outside of the cardboard in the package is preferably made white or off-white to provide the best basis for clear printing on the outside of a package. The inside of the cardboard in the package is colored to provide the best possible UV barrier against UV radiation from the package's environment. The inside is naturally slightly brown when unbleached and/or recycled fibers are used. This provides a certain increased barrier effect against UV radiation from the package's environment. id="p-9" id="p-9" id="p-9"

[0009] The outer envelope has 4 flaps on the top of the package that are folded in when the outer envelope is closed so that a completely flat upper part of the outer envelope can be created when these flaps are folded in towards each other. This is described in more detail below. The lower plane that constitutes the bottom of the outer envelope is made with cardboard flaps that are foldable so that the cardboard flaps in the bottom of the outer envelope can be folded in from the bottom and upwards and thereby allow the outer envelope to be folded completely flat. The outer envelope is here made with an elongated parallelepipedal shape, where the surfaces that delimit the parallelepiped longitudinally are designated by the designations upper plane and bottom with reference to the position that the package and thus the outer envelope takes when storing and transporting a contained liquid in the trade. id="p-10" id="p-10" id="p-10"

[0010] The inner bag is made of a plastic foil which may be made of fully recyclable bio-polyethylene plastic (bio-PE). This inner bag is designed to completely fill the outer envelope when the inner bag is filled with a liquid, thereby preventing unnecessary empty spaces from arising between the outer envelope and the inner bag. id="p-11" id="p-11" id="p-11"

[0011] The multifunctional opening module, also referred to as the MF module, consists of fully recyclable plastic, preferably the same material as in the inner bag. The MF module consists of an elongated plastic tray with an emptying device and a filling device integrated with the plastic tray on one side, here referred to as the upper side, of this. The plastic tray has a flat underside and is welded to the outside of the inner bag at an upper part of the inner bag. A slot runs along the edge of the plastic tray, in which the upper flaps of the outer envelope engage when the inner bag is installed inside the outer envelope. The filling device is used when filling a liquid into the package and is completely closed after filling. The emptying device is used when emptying liquid out of the package and is completely closed during filling. id="p-12" id="p-12" id="p-12"

[0012] The emptying device has a emptying channel which is connected to a hole in the plastic tray. Around the lower part of the emptying channel on the outside of this is a locking tab. A cap is intended to fit tightly to the upper circumference of the emptying channel. In the case of a previously unopened closure, the cap is attached to the locking tab in the emptying channel by means of a corresponding plastic edge which is connected to the locking tab to form a bayonet closure so that the cap can be easily separated from the emptying channel. Reclosing of the package is also easy by using a bayonet closure. Of course, a threaded closure can also be used, where also in this embodiment a locking tab can be used to lock the cap to the emptying channel when the package is unopened. The cap also has a "break function", which can be carried out by locking the cap against the emptying channel with an easily breakable plastic tab in a manner known in the art. Furthermore, the cap is fixed in the MF module by means of a string that is attached to a filling plug at the filling device. This means that the plug follows the packaging even during waste sorting. This latter is a requirement according to the EU's SUP directive. The emptying channel can be provided with a non-return valve to prevent air from entering when the packaging is partially emptied. Such a non-return valve can be used for thin-flowing contents. The cap has a cap whose cross-section should be square with four rounded corners or have another polygon-like shape so that it is easy for a user to get a grip on the cap when opening it. id="p-13" id="p-13" id="p-13"

[0013] The filler plug is lockably connected to a filler channel which is also fixedly connected to a separate hole in the plastic tray. The lockable filler plug has at least two annular locking tabs arranged around the circumference of the filler plug and arranged parallel to each other. id="p-14" id="p-14" id="p-14"

[0014] In a preferred embodiment, the plastic tray, the emptying channel and the filling channel are made in one piece. id="p-15" id="p-15" id="p-15"

[0015] The inner bag is made of two plastic films that are welded together around the entire edge of each plastic film so that a soft container is formed. The welding is carried out when an upper plastic film is placed over a lower plastic film, whereupon the welding is carried out. Before the welding is carried out and before the two plastic films are placed on top of each other, a hole is punched out in the upper plastic film in the area that is to take place as the upper layer of the inner bag, where the upper layer refers to the plastic film that is placed over the lower layer of plastic film in connection with the welding of the two plastic films. This hole is later coordinated to the position of the emptying channel of the MF module when welding the MF module to the upper plastic film. A flap, a sealing flap, is punched out at a position on the upper plastic film where the filling channel of the MF module will be located when the MF module is welded to the upper plastic film. The sealing flap is larger than the cross-sectional area of the filling channel in order to seal against the filling channel hole in the plastic tray on the underside of the MF module after filling the inner bag with contents. id="p-16" id="p-16" id="p-16"

[0016] The MF module is welded to the upper plastic film which will later constitute one half of the inner bag. The weld joint is designed so that no product from the inner bag when it is filled can leak out of the sides of the MF module. The manufacture of the inner bag and the welded MF module takes place under conditions approved for food packaging. After joining, the inside of the inner bag and the MF module are sterilized by means of gamma radiation. Irradiation with gamma radiation can be carried out for each inner bag, for a container with inner bags or when a pallet is completely full of inner bags. It should be clarified that the said container consisting of the lower plastic film and the upper plastic film with the welded accessories is the inner bag referred to here in the text. The welding of the upper plastic film and the lower plastic film is carried out after the MF module has been joined to the Upper plastic film. The inner bag is completely empty (with the exception of a small amount of air in the discharge channel) and after welding the MF module is hermetically sealed. id="p-17" id="p-17" id="p-17"

[0017] The device has features according to the features specified in claim 1. Features of a method for filling the package are specified in an independent method claim. A method for producing the inner bag of the package is specified in an independent method claim. Further embodiments of the invention are presented in the dependent claims.

DESCRIPTION OF THE FIGURES Figure 1 schematically shows a plan view of a piece of cardboard that forms the basis for development into an outer casing for the package.

Figure 2 illustrates the outer casing in a perspective view when it has been developed and formed from the cardboard piece according to Figure 3. Figure 3 shows the upper plastic foil that will form one side of the inner bag when it is welded together with a lower plastic foil.

Figures 4a, 4b and 4c show the Multifunctional Module (MF Module) with its details. Figure 4a shows the MF Module seen from above. Figure 4b shows the plastic tray with its details in a side view. Figure 4c shows the drain channel cap and the filler plug seen from the side.

Figure 5 shows the upper plastic foil according to Figure 3 with the MF module welded on. A section shows the position of the welding wires when the MF module is welded to the upper plastic foil.

Figure 6 shows the lower plastic foil which is completely without openings or associated elements.

Figure 7 shows the position of the welding seams when the upper and lower plastic foils are welded together to form an inner bag.

Figure 8 shows a shape for a folded inner bag before it is inserted into the outer envelope.

Figure 9 illustrates the manner in which an inner bag is inserted into the outer envelope.

Figure 10 shows how the MF module is connected to the edge tabs of the outer casing.

Figure 11 shows the package closed with the outer casing lid attached to the MF module. Figure 12 and Figure 13 show the final filled package in side view and top plan view, respectively.

Figure 14 and Figure 15 show the MF module with the filler plug closed and with the filler plug opened, respectively, in both side views and top views.

Figure 16 and Figure 17 illustrate disinfection of the filling device with hydrogen peroxide and with UV radiation, respectively.

Figure 18 shows a section of the filling nozzle connected to the filling channel with the sealing flap opened on the inner bag.

Figure 19 shows a section of a filled package with a filled inner bag and a closed emptying or filling channel.

DESCRIPTION OF EXECUTIONS id="p-18" id="p-18" id="p-18"

[0018] In the following, a number of embodiments of the invention are described with the aid of the accompanying drawings. The drawings only show schematically the principle of the device and do not claim to show to scale any proportions between different elements thereof. As mentioned, the invention constitutes a package where in figure 1 a future outer casing of this is shown from a starting position in the form of a piece of cardboard 1 folded and glued along a long side to be developed further into an outer casing 2 according to figure 2, where the outer casing 2 in this figure is prepared for receiving a content after folding the cardboard at folding instructions 3 according to figure 1. Folded into the cardboard piece 1 are also shown a number of bottom flaps 4 which, when developing the cardboard piece 1, form the bottom of the outer casing 2. These bottom flaps 4 can be folded inside the cardboard piece 1 when the outer casing 2 is emptied so that the outer casing 2 can regain a flat shape after it is simultaneously flattened out at the folding instructions 3. This possibility of being able to achieve a flat shape of the outer casing 2 when emptying the content from it is of great importance in order to make it possible to completely empty the packaging. When the cardboard piece 1 is unfolded, a square cross-section is formed in the outer casing 2. This is a preferred embodiment. Of course, a rectangular cross-section is also a variant. When folding along the folding marks 3 in the upper part of the outer casing 2, three edge flaps 5 are formed, two at the sides and one in the front part of the outer casing 2. In the edge flap 5 in this front part, at each corner 7 of the outer casing 2, a fastening flap 5a is formed in the front edge flap. These fastening flaps 5a are brought down towards the two edge flaps 5 which are folded inwards along the sides and are glued together with the part of the underlying edge flap 5 which is covered by the fastening flaps 5a. The fastening flaps 5a together with the edge flaps 5 constitute fasteners to which the so-called MF module is attached, which is described below. A cover 6 opposite the front edge flap 5 is folded down and forms a cover of the outer casing 2 when the cover is folded down towards the installed MF module. id="p-19" id="p-19" id="p-19"

[0019] The inner bag 8 is made of two plastic films which are welded together around the entire edge of each plastic film so that a soft container is formed. The welding is carried out when an upper plastic film 9 is placed over a lower plastic film 10 (see figures 5, 6, 7) whereupon the welding is carried out. Before the welding is carried out and before the two plastic films 9, 10 are placed on top of each other, a hole 11 is punched in the upper plastic film 9 in the area which is to take place as the upper part of the inner bag 8. This hole 11 is later coordinated with the position of the emptying channel 13 of the latter when the MF module 12 is welded to the upper plastic film 9. A sealing tab 14 is cut or punched out at a position on the upper plastic foil 9 where the filling channel 15 of the MF module 12 will be located when the MF module 12 is welded to the upper plastic foil 9. Thus, an opening with a sealing tab is created in the plastic foil 9, where the sealing tab is cut out with 3 sides free from the upper plastic foil 9. Furthermore, the area of the sealing tab 14 is arranged to be larger than the cross-sectional area of the filling channel 15 in order to be able to seal against the filling channel 15 hole in the plastic tray 16 on the underside of the MF module 12 after filling a content into the inner bag 8. The upper plastic foil 9 and the lower plastic foil are punched or cut out during production from a rolled-out plastic foil sheet. id="p-20" id="p-20" id="p-20"

[0020] Figures 4a to 4c show the structure of the MF module 12. The bottom figure 4a shows a plan view from above while figures 4b and 4c show side views of the details of the MF module 12. The MF module is built on a plastic tray 16. The MF module consists of an elongated plastic tray with an emptying device and a filling device integrated with the plastic tray on one side, commonly called the upper side, of this. The plastic tray has a flat underside and is welded to the outside of the inner bag at an upper part of the inner bag. The dashed line in the plastic tray 16 indicates the inner depth of a slit 17 running around the side edge of the plastic tray 16. The edge flaps 5 of the outer casing 2 connect to this slit 17 when the MF module 12 is connected to these. The emptying device has a emptying channel which is connected to a hole in the plastic tray. Around the lower part of the emptying channel on the outside of this is a locking tab. The MF module 12 further has a hole in which the emptying channel 13 is fixedly connected. In figure 4c, above the emptying channel 13 in the connecting figure 4b, a cap 18 is shown which is sealing against the opening of the emptying channel 13 when the cap 18 is connected to it. In the case of a previously unopened closure, the cap is attached to the locking tab =I~~on the outside of the emptying channel by means of a corresponding plastic edge which is connected to the locking tab to form a bayonetšššsá gclosure so that the cap can be easily separated from the emptying channel. The packaging can also be easily re-closed by using the bayonetššfix* =l=§=.»;_§closure. Furthermore, the cap is fixed in the MF module by means of a string which is connected to a filling plug at the filling device. The cap 18 is equipped with the elements previously described, such as a breaking function 19 against the discharge channel 13 and a string 20 connected to the MF module 12. The breaking function 19 can be performed by locking the cap against the discharge channel with an easily broken plastic tab in a manner known in the art. The string 20 is connected to a filling plug at the filling device. When the closure has not been opened previously, the cap 18 is fixed to the locking tab (not shown) 'ëššthe discharge channel by means of a corresponding plastic edge which is connected to the locking tab. Such locking tabs are known in the art and will not be described further. The cap 18 is in a design closing against the discharge channel 13 by means of a bayonet-type closure. Bayonet-type closures are well known in the art and will not be described further. The bayonet-type closure is opened by turning the cap 18 less than 90 degrees. Since the cap 18 is detached from the discharge channel 13 via a connection with a break function, a consumer can easily see whether the package has been opened previously. In the plastic tray 16 there is a further hole to which the filling channel 15 is fixedly connected. A filling plug 21 is fitted to the filling channel 15. This filling plug 21 is after filling the package sealingly connected to the filling channel 15 by means of double annular locking tabs 22 around the plug 21 which securely locks the filling plug 21 to the MF module 12. Hereby, the cap 18 is also firmly connected to the MF module 12 since the string 20 is connected to both the cap 18 and the filling plug 21. When the package is to be used to contain thin-fluid products, the emptying channel can be provided with a check valve to prevent air from entering the inner bag when the contents are poured out. This prevents oxidation of the contents, thereby extending the shelf life of the product. id="p-21" id="p-21" id="p-21"

[0021] The MF module 12 consists of the plastic tray 16 and the emptying device, which comprises at least the emptying channel 13 with the associated cap 18 and further comprises at least the filling channel 15 with the associated filling plug 21. The plastic tray 16, the emptying channel 13 and the filling channel 21 together constitute a fully integrated and individual unit. The MF module 12 is made of a fully recyclable plastic, preferably of the same plastic material as the inner bag 8. In any case, at least one of the cap 18 and the filling plug is fixed to and associated with the MF module id="p-22" id="p-22" id="p-22"

[0022] Figure 5 shows how the MF module 12 is welded to the upper plastic foil 9 which will later constitute one half of the inner bag 8. The weld joint 23 is shown in Figure 5, in a section, as a roughly dashed line along the edges of the underside of the MF module 12 and also across the underside of the MF module between the emptying channel 13 and the filling channel 15. The MF module is designed so that no product from the inner bag 8, when filled, can leak out of the sides of the MF module. The manufacture of the inner bag 8 and the welded MF module 12 takes place under conditions approved for food packaging. The inside of the inner bag 8 and the MF module are sterilized after joining by means of gamma radiation. It should be clarified that the said container consisting of the lower plastic film 9 and the upper plastic film 10 with the welded accessories is the inner bag 8 referred to here in the text. The welding of the upper plastic film 9 and the lower plastic film 10 is carried out after the MF module 12 has been joined to the upper plastic film 9. The formed inner bag 8 formed during the welding is shown in Figure 7, where the dashed line shows the position of the weld joint 8a between the two plastic films 9, 10. After the welding, the inner bag 8 is completely airless (with the exception of a small amount of air in the discharge channel) and hermetically sealed. id="p-23" id="p-23" id="p-23"

[0023] The filling process is described below. This begins with the edge flaps 5 being folded down inwards towards each other. In the front corners 7 of the outer casing 2 where the front ends of the edge flaps 5 meet the fastening flaps 5a and abut each other, these are glued together and thereby locked to a defined position and form the upper corners of the outer casing 2. The inner bag 8 has been folded into a format according to figure 8 where the inner bag can preferably fill the entire space inside the outer casing 2 when supplying liquid to the inner bag 8. Figure 9 shows how the folded inner bag 8 is inserted into the outer casing 2. When inserting the inner bag 8 into the outer casing 2, it is ensured that the MF module 12 slots 17 in its plastic tray 16 engage with the three edge flaps 5 and are locked in position against these edge flaps (see figure 10). The MF module is held in a fixed position during the filling process. This is done by using an external tool that holds the MF module 12 during filling. A counter pressure from the MF module is needed to hold a filling nozzle tightly against the filling channel 15. The filling plug 21 in the filling channel 15 is loosened and temporarily lifted off during the time during which filling of a liquid to the inner bag 8 is in progress. Before filling, parts of the inner bag around the filling opening are disinfected (suggestedly with a hydrogen peroxide atmosphere in combination with UV light) to ensure a bacteria-free filling. For the sake of clarity, disinfection using hydrogen peroxide is shown in Figure 16 and correspondingly disinfection with UV light in Figure 17. Equipment for disinfection using hydrogen peroxide is marked with H and equipment for disinfection with U. The details of the MF module 12 itself in Figures 16 and 17 correspond entirely to those indicated in Figures 14 and 15. By being able to disinfect on this small scale, there is a significant saving of hydrogen peroxide compared to disinfecting the inside of entire packages with hydrogen peroxide as is done in today's technology, for example when filling packages without an inner bag. id="p-24" id="p-24" id="p-24"

[0024] Filling of the inner bag 8 is carried out by inserting a filling nozzle 24 into the filling channel 15 of the MF module 12 (see figure 18). The filling nozzle 24 seals completely against the inside of the filling channel 15. When the liquid product (liquid) is filled under pressure through the filling nozzle 24, the punched-out flap 14 in the inner bag 8 opens automatically so that a free passage for the liquid is created. Filling can now take place with high pressure because the inner bag 8 is airless and therefore no air needs to be pressed out during the filling process. After the filling of the inner bag 8 is completed, the filling channel 15 is closed by means of the filling plug 21 which thereby seals directly against the sealing flap 14 in the inner bag 8. The filling plug 21 is securely locked against the inside of the filling channel 15 by the annular locking flaps 22 of the filling plug 21 around its periphery engaging with corresponding annular slots along the inside of the filling channel 15 when the filling plug has been fully inserted into the filling channel. id="p-25" id="p-25" id="p-25"

[0025] After filling the inner bag 8, the sealing flap 14 is pushed back by the contents and seals against the underside of the MF module 12, i.e. against the underside of the plastic tray 16 and against the underside of the filling plug 21 where this is completely immersed in the filling channel 15. See Figure 19. The liquid content in Figure 19 is referred to with reference number 27. Since the inner bag 8 is airless when filled, there is only a very small air volume in the filling channel 15 of the MF module 12 itself. This prevents unwanted oxidation of the contents of the inner bag, i.e. of the liquid that constitutes a foodstuff, and thereby significantly extends the shelf life of the contents. The air content in a 1-liter package produced and filled according to the inventive aspect constitutes less than 0.3% percent of the packaging volume. In prior art packaging for liquid foods, the air content can be up to 7% of the corresponding volume. This property is of significant importance in food technology, as the shelf life during transport and storage of liquid foods can be significantly extended compared to what is possible when using today's equivalent packaging. id="p-26" id="p-26" id="p-26"

[0026] During filling, air between the inner bag 8 and the outer casing 2 flows out partly via the top and partly via the bottom of the outer casing 2, which also has openings in the foldable bottom structure between some of the bottom flaps 4. After filling the inner bag 8, the large flap of the outer casing 2, here called the lid 6, is inserted into the rear part of the slot 17 of the MF module 12. The lid 6 is simultaneously fixed to the connecting two side flaps 5 with a glue point on each side of the lid 6 (Figures and 11) at the points id="p-27" id="p-27" id="p-27"

[0027] A filled package according to the invention is shown in a side plan view in Figure 12, where both the cap 18 and the filling plug 21 are closed against the emptying channel and the filling channel, respectively.

Figure 13 shows a plan view of a filled package from above. id="p-28" id="p-28" id="p-28"

[0028] The folding construction with the bottom flaps 4 at the bottom of the outer envelope 2 allows a consumer to easily squeeze out viscous foods (such as yogurt, crème fraiche, etc.). The lower sides of the outer envelope 2 can be pressed together to thereby apply pressure to the inner bag 8 and help empty the package. When the inner bag has been removed from the package, the outer envelope can be easily flattened by the user pressing the bottom flaps into the outer envelope and simultaneously pressing on the sides of the outer envelope. In this way, the outer envelope 2 is easily returned to a flat piece of cardboard 1 similar to the original state according to figure 1, after which it is sorted as cardboard material. The outer cover 2 is easily opened on the top using a lifting tab 26 located in the lid 6 of the carton. This allows the consumer to remove the inner bag 8 and possibly empty it further if desired. The inner bag 8 is then closed with the cap 18 and disposed of as plastic. id="p-29" id="p-29" id="p-29"

[0029] If an additional barrier effect against the influence of oxygen and/or other gases and UV light on the food content is desired, the inner bag 8 can be made of a plastic material other than PE plastic and/or of laminate. Laminate here means that the material can consist of several layers of plastic, e.g. 3 plastic foils, and/or aluminum and other coatings. ll id="p-30" id="p-30" id="p-30"

[0030] The weight of a 1-liter package according to the invention is equivalent to corresponding packages for liquids currently on the market (about 30 grams per piece). The height of a 1-liter package is about 10% (about 2 cm) lower compared to a package of the TetraRex® type, which makes it possible to increase the number of packages that can be loaded on a cargo platform or container.

Claims (11)

1. PATENT CLAIMS Packaging for liquid food, wherein the packaging is characterized in that it comprises: an outer casing (2) of cardboard, an inner bag (8) of plastic foil consisting of fully recyclable bio-polyethylene plastic, wherein the inner bag is arranged inside the outer casing (2) and completely fills this when the inner bag is filled with said liquid food, an opening module, here called MF module (12), which contains a discharge device and a filling device arranged on a plastic tray (16), wherein the discharge device comprises at least one discharge channel (13) and a cap (18) and wherein the filling device comprises at least one filling channel (15) and a filling plug (21) and wherein the MF module (12) is connected to the inner bag (8) by the underside of the plastic tray (16) being welded to the outside of the inner bag in such a way that the discharge channel (13) is connected to a hole (11) in the inner bag (8) and that the filling channel (21) is connected to an opening with a sealing flap (14) in the inner bag (8), and where the plastic tray (16) of the MF module (12) has side edges that are provided with a slot (17) and the MF module (12) is connected to the outer casing (2) by edge flaps (5) and lids (6) of the outer casing (2) being connected to the slot (17) in the side edges of the plastic tray (16). 2. Packaging according to claim 1, wherein the outer casing (2) consists solely of fully recyclable cardboard containing approximately 90% paper fibers. 3. Packaging according to claim 2, wherein the inner bag (8) is made of an upper (9) and a lower (10) plastic foil placed against each other and welded together along the edges of the plastic foils (9, 10) by means of a welding joint (8a). 4. Packaging according to claim 3, wherein the outer casing (2) has an elongated parallelepipedal body, one of the surfaces defining the elongated body constituting the bottom of the outer casing (2) while the other defining surface of the elongated body constituting the top of the outer casing. 5. Packaging according to claim 4, wherein the top of the outer casing (2) consists of edge flaps (5) and a lid (6) which are all folded against the side edges of the plastic tray (16) in the MF module (12) and wherein the edge flaps (5) and the lid (6) are glued to each other at the points where the edge flaps (5) and lid (6) abut each other. 6. Packaging according to claim 5, wherein the MF module (12) šæ-aï-*fï-eiæ--capsule (18) §:_í§1__is attached to the emptying channel (13) by means of a bayonet closure and a connection with a break function (19), wherein the filling channel (15) is closed by means of the filling plug (21), and wherein the cap (18) is connected to the filling plug (21) by means of a string (20). 7. Method for filling the package according to claim 1, characterized by the steps: the emptying channel is kept closed by means of the cap (18), a filling nozzle (24) is inserted into the filling channel (15) of the MF module (12), liquid food is introduced into the inner bag (8) under pressure, whereby the sealing flap (14) in the inner bag is opened and allows the introduction of the food, after the filling of the inner bag (8) is completed, the filling channel (15) is closed by means of the filling plug (21), and the filling plug (21) is sealingly connected after filling the package to the filling channel (15) by means of double annular reading flaps (22) around the plug (21) which read the filling plug (21) to the MF module (12). 8. Method according to claim 7, comprising the steps: the liquid food is filled into the inner bag (8) until less than about 0.1% of the volume of the package consists of air, after filling the inner bag with the food, the sealing flap (14) is pressed back towards the filling channel (15). 9. A method for sterilizing the package according to claim 1, comprising the step of: sterilizing the inside of the inner bag (8) and the MF module (12) by means of gamma radiation. 10. Method according to claim 7, comprising the step: when filling the package, the filling plug (21) and the filling channel (15) are disinfected with hydrogen peroxide (H) and preferably also with ultraviolet light (U). 11. Method for producing the inner bag (8) for the package according to claim 3, characterized in that it comprises the steps: - an upper plastic foil (9) and a lower plastic foil (10) are punched or cut out from plastic foil sheets, - a hole (11) and a sealing flap (14) are punched or cut out in the upper plastic foil (9), - the MF module (12) with a discharge channel (13) and a filling channel (15) are welded to the upper plastic foil (9), whereby the discharge channel is arranged against the hole (11) and the filling channel is arranged against the sealing flap (14), - the upper plastic foil (9) is welded together with the lower plastic foil (10) along the edges of these two foils.