DE19654230A1 - Food packaging, method for producing an oxygen-tight packaging, device for carrying out such a method and related cardboard cuts used - Google Patents

Abstract

Disclosed is a food packaging in the form of a shape-retaining preformed carrier shell comprising an upper peripheral edge (52), with a preferably oxygen-tight covering foil (20) to hermetically seal the inner space of the container. The edge (52) comprises individual edge segments (54) to fix the covering foil (24), wherein the edge (52) is formed on the outer side in such a way that the edge segments (54) evenly close each other in a closed position. Further disclosed is a method and a device for the production of oxygen-tight packaging, wherein preformed and shape-retaining carrier shells are fed by a dispenser. Said shells are covered with a plastic compound foil in a forming station. In order to enhance stability, the cardboard cuts (10) in the carrier shell rows are interconnected by connecting pieces that coincide with the edge (52) of the container thereby forming one piece. The shells pass through the food packaging installations in rows and synchronically and are sealed together.

Description

The invention relates to a food packaging ge according to the preamble of claim 1 and a method for Production of such a packaging according to claim 7, a Device for carrying out such a method the preamble of claim 15 and a suitable one Semi-finished product in the form of erected and glued cardboard cuts.

Food packaging is in great variety the market, with recent special efforts be made, the proportion of non-recyclable Plastics with such packaging to a minimum limit. So far, groceries have packs in the form of deep-drawn plastic trays enforced, which is usually made of a carrier material be thermoformed, which for example made of PVC, poly esterol or polyester is formed.

The conventional ones made of PVC, polyester or poly Shell made from esterol is produced in terms of production technology due to so-called "vacuum forming and filling systems" very uneven thickness distribution due to the available standing output strength in the known thermoplastic Deformation process.

On the one hand, this requires in relation to the desired one Drawing depth and container shape up to a strong starting thickness 1000 µm in order to achieve the required residual wall thickness in the Bo to reach the radii. On the other hand, the thinning leads the one to be used for shaping the plastic shells Plastic films in the base radii very often too  ten "kink breaks", especially during transport may occur.

Series tests have also shown that the results of the Production of the plastic shells used barrier layer layer, preferably made of polyvinyl alcohol (EVOH), which the required oxygen barrier guaranteed and at a previously described application of so-called rigid foil ver bound between the carrier film and the sealing layer is embedded, a much poorer molding result shows d. H. low residual wall thicknesses of this EVOH Layer.

It is therefore necessary that art backing material of the shells to be formed, for the Dimensional stability is required, with an additional acid barrier layer is equipped. This oxygen barrier Layer usually consists of polyvinyl alcohol. Additional Lich a third layer of film is required to To be able to seal the lidding film.

This requires a so-called multi-component existing, relatively thick multi-layer composite film, the one Recycling, i.e. a single reuse, impossible do.

Such a shell is for example in the EP 01 69 799. It also contains a method of with a variety of individual, separate Trays in a filling or sealing station be performed. The shells are successively made with one thin plastic layer lined before spitting with sp filled and sent to a sealing station the. A cover film is applied in the sealing station sealed the bowls filled with food. Ent stands a bowl, the carrier material is essentially Wood grinding or foamed plastic. Furthermore, the  Shell itself to be essentially porous, so art fabric film for lining the shell due to an under can be applied half the shell generated vacuum. The advantage of these packaging systems with such Scha len is that the packaging device over can be built visually, including a modular Compilation of the device is possible.

In contrast, attempts have been made to reduce the plastic content such food packaging, which, in order to meet the requirements to achieve residual wall thicknesses in the base radii, must be relatively high, by reducing that coated cardboard is used. Here it has However, it was found that it is difficult to use cardboard coated plastic materials in devices too process in which largely known or already exi permanent modules are used. In addition, at those pressed from coated cardboard containers maximum mold depths limited to 25 to 30 mm.

Even if through a barrier film sheeting such containers manufactured in the cold pressing process are equipped so that they are oxygen-tight due to the cold forming process folds due to the resulting material displacement. This unfolding extend into the edge flange area of the container, making a safe and uninterrupted, but most of all oxygen-tight sealing with the cover film impossible becomes. For example, container depths of more than 30 mm To produce depth of form, containers are made of coated used cardboard, which are formed from blanks. This made of coated cardboard on a separate aggre gat are erected, folded and glued and used as loading container fed to the packaging system.

However, it is not possible to use coated ones Cut the manufactured container to the cut or glue  order really gas and oxygen tight to connect. Such problems occur in particular with containers which have an edge flange. With the already known Coating of cardboard blanks is only one White moisture stability achieved, with the open Edges also do not completely remove moisture can be shielded.

However, there is a need for a grocery store Pack according to the preamble of claim 1 create that with little conversion effort on conventional horizontal form, fill and seal system is adjustable, the proportion of plastic on a mini mum is reduced, but at the same time the stability of the Container and the oxygen density on a special high level can be maintained.

Another task is to develop a method for oxygen-tight packaging of food with aids Taking food packaging of the above kind to develop such that conventionally modular Packaging systems with a higher cycle rate and still running can be operated more economically. Finally there is an object of the invention still in the device for Carrying out the aforementioned method of the first to adapt packaging according to the invention that the Störan Maturity of the packaging systems even at the highest clock number is minimized.

These tasks are related to the food processing Pack with the features of claim 1, in terms of Method with the features of claim 7, with regard the device for performing the method according to An saying 15 and with regard to the semi-finished product with the features of claim 23 solved.  

The food packaging according to the invention has load-bearing base with a thin plastic composite foil lined cardboard blank, which automatically on straightenable and ver its interior at the cut edges sticks. The cardboard blank also has an edge flange with individual edge flange segments, on which then the lid film is attached. In addition, the Edge flange according to the invention shaped on the outside so that the Edge flange segments flush in the sealing position close. For this purpose, the individual edge flange segments fermentation cut lines on the basis of which the win angle position of the edge flange can be determined. By the use of prefabricated cardboard blanks results the advantage that when erecting the cardboard blanks no material thinning occurs, in contrast to the be knew bowl. This means that due to the material ver thinning disadvantages with the invention Food packaging overcome. Because the edge flange segments flush in the sealing position close, there is a closed edge flange top surface, which then securely seals the box tailored to be used.

According to claim 2, the plastic composite film Oxygen barrier layer, preferably made of polyvinyl alcohol, a sealing layer, preferably made of peelable polyethylene, and an adhesive layer, preferably made of modified Po ethylene, especially a copolymer of ethylene with 6% Methacrylic acid, partially (50%) with Na or zinc ions are neutralized (Surlyn A), so it becomes more flexible Composite used, its oxygen permeability in the front can be set from and also in the embedded Zu was not changed. Therefore one can clearly thinner EVOH layer, which in a flexible ver is embedded, can be used.  

If the food packaging according to the invention Claim 6 preferably with a cardboard blank from ge equips that of one recyclable or preferably two layered cardboard, it becomes a food packaging created that is suitable on the outer layer of the cardboard blank a special advertising effect bear pressure. This in particular becomes a possibility created the food packaging op to emphasize table.

Further advantageous embodiments of the food packaging are the subject of the other subclaims 3 to 5.

The inventive choice of the lined Kar There is a container in the clay cut-outs, which is used for shrinking into the vacuuming or sealing station except for one Side, namely the upper side, is oxygen-tight. There in addition, the plastic-lined cardboard blank also in the field of those specially trained according to the invention Edge flanges can have a particularly high dimensional stability this edge flange between the seals of the closed NEN sealing tool can be safely recorded so that it according to the invention, only the inner cavity of the shaped door cup must be evacuated. The power consumption of the Packaging system for generating the evacuation is ver wrestles, the cycle number of the packaging system can be raised significantly.

It has been shown that the invention formed edge flanges that are close together and close to form continuous saddle bars, high stability is reached and even when filling the bowl with Le means an uncontrolled break or an uncontrolled torn tearing of the webs can not take place. The Be drive reliability of the device can also can also be raised in that the between the  Carrier shell interiors are designed as sealing webs formed edge flanges from below using parallel to the trans directional sliding and guide rails un be supported. Further training is also advantageous, that the container in the filling section from below by means of one running synchronously with the transport device Support band are supported.

By inventing the erected cardboard blanks according to claim 7 in rows in the forming station are arranged, it is possible that between adjacent cardboard blanks a widened sealing surface the edge flanges is formed. This ensures that the sealing is achieved safely. Furthermore, it is achieved that several cardboard blanks are made at the same time can, and through the widened sealing surface because of the adjacent edge flanges the Versie is simplified.

These further developments result in particular Advantages of largely simplifying a ver packaging system, since this process does not have a separate tie drawing die station or special preheating system more required are. Nevertheless, the necessary for this che continuous path according to the invention for the accommodation the filling station can be used and thereby a space saver who created such a packaging system the.

The overall system can either be considerably shorter or the filling section can, if necessary, be used much better, which in some cases the Filling process is visibly easier.

With the food packaging according to the invention the proportion of non-recyclable plastics Reduce minimum, with the invention  The choice of material for the cardboard blanks is an additional advantage problem-free self-rotting.

Finally, the power consumption of the packaging system, especially in the area of the forming station wrestles because the time it takes to warm a normal one Chen hard film from approx. 500 to 1000 µm (PVC, polystyrene or polyester) can be significantly reduced. The be required inherent stability of the container is inventively by using the cardboard blank he described is enough, especially if the cover film on the art fabric that lines the cardboard blank, attached is.

The food packaging according to the invention experiences ge compared to foodstuffs used in cardboard blanks tel packaging has increased dimensional stability and is in egg high degree of torsional stability.

Objects are further advantageous refinements of the other subclaims. Below is a schematic table drawings an embodiment of the invention explained in more detail.

Fig. 1 is a schematic side view of a first embodiment of the packaging system according to the invention.

Figure 2 is a perspective view of erected carton blanks.

Fig. 3 is a side view on an enlarged scale, the molding station of the packaging system.

Fig. 4 is a front view of the molding station shown in Fig. 3 with the inserted cardboard blank arranged in rows like a row and the Kunststoffverbundfo lie, which is fed for the lining.

Fig. 5 is a perspective view of cardboard blanks arranged laterally in a row, which are already lined with the plastic composite film, wherein in a sectional view shown on a somewhat enlarged scale along the line drawn with the arrow of the row-wise arranged cardboard blanks, the heat-laminated edge flange area is shown.

Fig. 6 is a front view of the vacuum or Versie gelungsstation with inserted cardboard blanks, which are already clad with plastic composite film and are connected to a row.

Fig. 7 is a perspective view of the connected cardboard blanks with plastic composite film and sealed cover film, the details of the cardboard blank and the adhering layers are shown more clearly on an enlarged scale.

Fig. 8 is a perspective view of a ready-to-use shell according to the invention.

Fig. 9 is a perspective view of the shell according to the Invention with the cover film partially detached.

Fig. 10 is a perspective view of the bowl to the invention OF INVENTION partially detached cover sheet and partially dissolved out inner film.

In Fig. 1 is a side view of the packaging system is shown which essentially consists of four stations, namely a molding station (FS), a filling line (BS), the sealing and Vakuumierungsstation (VS) and a preferably two-stage separation system (80, 81) , the latter can also be designed in one stage. The transport of the precisely arranged in-line cut boxes to the individual stations is preferably carried out via a transport chain or, when used on a so-called "tray sealer", via a specially designed conveyor belt with receiving spaces for the adjacent cardboard cuts. As shown in Fig. 1, 48 so-called support straps 50 may be additionally provided below the transport chain 48 for relief in parts of the transport chain.

The prepared in a magazine or dispenser 12 on directed cardboard blanks 10 fall clocked with the support of a proven, pneumatically working device 9 on a conveyor belt. Also clocked, the erected cardboard blank is transported under a Stempelvor direction with a stamp 11 , where the edge flange 52, in particular the edge flange segments 54, is broken before the individual cardboard blanks 10 are inserted into the forming station FS. The stamp 11 is designed in such a way that the edge flange 52 is broken into the possible sealing position with a corresponding inclination, depending on the fermentation cut at the ends of the edge flange segments 54 . After breaking the edge flange segments 54 , the cardboard cuts are transported to a transfer position, from which they are placed under clock-controlled suction air support by means of a special transport stamp 13 into the open receptacle form of the forming station FS. In the tray sealer system, the cardboard blanks are placed in corresponding receiving spaces in the transport chain 48 .

If, on the other hand, the edge flange segments 54 are only broken in the forming station FS, a process step can be saved. However, the design requirements for such a molding station are considerably higher. In this case, however, it would be ensured that the edge flange segments 54 would only be broken shortly before they were sealed.

If a method according to the known tray sealer is used, the transport chain 48 then transports the carton blanks 10 arranged closely to one another in a clock-controlled manner into the forming station FS. The molding station FS can be designed in the same way as, for example, a station of a molding, filling and sealing system according to the Multivac CD6000, which works according to the skin system.

Starting from this situation, the rows of closely arranged cardboard blanks are located in the forming station, the actual shaping or lining process of the cardboard blank 10 begins by means of plastic composite film 34 . In the forming station, the lining of the inner surface of the rows of cardboard blanks 10 arranged moderately next to one another is carried out with an oxygen-blocking plastic composite film 34 . The plastic composite film 34 is drawn from an endless roll 33 , which is attached to a support arm via the inlet section of the packaging system, via deflection rollers via the cardboard blanks 10 arranged in rows in the receptacle, essentially parallel to the transport chain.

When using a tray sealer, the transport chain 48 carries out the same cycle, the rows of cardboard blanks 10 arranged in rows in the receiving rooms of the transport chain under a forming station FS, whose working principle for lining the inner surface of the cardboard sections 10 with the plastic composite film 34 on a mold -, Filling and closing system used Iso-Pack-System by MULTIVAC.

The packaging containers are then transported by means of the transport chain 48 into the area of a filling section BS, the filling section BS being designed according to the number of filling steps.

To relieve the transport chain 48 , the card blanks 10 , which are now connected by the plastic composite film 34 , can be supported by a support belt 50 , which works in sync with the transport chain.

From the filling section BS, the filled shells run into a vacuuming and sealing station VS, a cover film 20 guided by the endless roller 22 via a deflection roller system being fed into the vacuuming and sealing station VS substantially parallel to the transport route. The operation of the vacuuming and sealing station VS corresponds to conventional systems, e.g. B. from Multivac and is described in Fig. 7 in detail.

After the filled packaging containers have been sealed, they are in turn fed to the individual stations 80 , 81 by means of the transport chain, the cardboard blanks 10 arranged in a row in a row being supported again by a conveyor belt 50 operating in a clockwise manner.

As can also be seen in Fig. 1, the transport route of the transport chain 48 and the support belt 50 extends from the donor to immediately behind the two-stage Ver single station 80 , 81 , so that the entire system works in the same cycle.

The peculiarity of the packaging device is that on the one hand, a specially designed Kartonzu cut 10 is used and on the other hand, this cardboard blank 10 in a special way, namely as a specially designed semi-finished product of the packaging system.

Contrary to conventional designs of such packaging systems, the dispenser 12 leads to a cardboard blank 10 which has already been formed and is, for example, dimensionally stable, for example by gluing, with an upper edge flange 52 . The semi-finished products supplied to the packaging device have, according to the invention, specially designed circumferential flanges, in particular edge flange segments 54 with mutually coordinated fermentation lines which are broken by the stamp 11 and are inclined in their sealing position depending on the fermentation line. The decisive factor here is that the edge flange segments 54 only have to be broken or inclined until the edge flange segments 54 are flush with one another. This results in closely fitting sealing surfaces which lie closely against one another and can rest on a sealing device provided for this purpose and thus provide a sealing surface which is sufficiently large for lining with plastic composite film.

In Fig. 2 erected, rows of cardboard blanks 10 are shown in perspective, just in case an optionally provided recessed handle GM can be seen, for which a special edge flange section 24 B can be provided. Furthermore, overlap sections 55 between adjacent wall sections of the carrier shells can be seen. However, an overlap does not take place in the area of the edge flange 52 , so that a coherent, stepless sealing surface can be created.

In the side view of FIG. 3 can be seen the way in which in the forming station FS 16 and 18 with the rows adjacent Kartonzusc cooperate hnitten the tool halves, and by a heating device 72, the inside and surfaces of the serially aneinanderlie constricting carton blanks 10 with the composite plastic film 34 undress.

The tool of the molding station FS, which works according to the so-called skin method, consists of a lower mold 16 and an upper mold 18 , which are moved apart and moved in a clocked manner in accordance with the arrow shown in FIG. 3. Here, the lower mold 16 preferably has a pro fil for the positive reception of the cardboard blanks 10 , so that the edge flanges 52 of the cardboard blanks 10 are supported by a seal. The upper mold 18 is also designed so that a heater 72 is added to who can. With 73 and 73 A recesses in the upper and lower part 16 , 18 are shown, which are designed according to the recessed grips GM.

In Fig. 4, the front view of the forming station FS is shown ge, the lower mold 16 having web-like inserts 66 , the shape of which is adapted to a cross section of the cardboard blanks 10 arranged and erected in rows. Here are the tightly adjacent Randflan cal adjacent cardboard blanks 10 on these web-shaped inserts fit snugly, so that in the collapsed state of the tool halves 16 and 18, the individual NEN cardboard blanks additionally by the intended mold inserts 58 , the surface contours of which correspond precisely to the shape of the individual cardboard blanks, positively are supported. The functionality of the forming station FS, in particular the skin process, is briefly described in the following procedure:
If a row of erected cardboard blanks, which lie close together with their edge flanges in a row and thus form a saddle-shaped support, is introduced into the forming station FS by means of a denester system and the edge flange segments 54 are precisely aligned, the lower part 16 of the tool previously moved downward moves Forming station FS in the direction of the arrow. When together the tool bottom part 16 menfahren part against the upper tool 18 a nearly saturated vollständi vacuum is created in the upper tool part 18th The plastic composite film 34 lying over the cardboard blanks 10 , which are arranged closely in rows, is thereby applied to the entire surface of the heating plate 72 and heated.

After the specified heating time, the tool upper part 18 is ventilated with simultaneous evacuation of the lower tool part 16 . This change creates a differential pressure of approx. 1 bar, which causes full-surface heat lamination between the plastic composite film and the inside of the cardboard blank (dashed line 34 A).

Since the inner surfaces of the closely spaced carton blanks are now lined with the plastic composite foils, the forming station FS is opened at the same time, whereby the individual carton blanks connected by the plastic composite foil are released and conveyed to the transport chain 48 for filling.

In Fig. 5 is formed by the closely spaced carton blanks 10 , lined with plastic composite film 34 on the inside and coherent Kartonzu section row, as this leaves the forming station FS ver. As can also be seen, the plastic composite film 34 also covers the grip hole recess GM in the edge flange area 24 B.

The sectional drawings along the edge flange 52 of a cardboard blank 10 with a cardboard blank composite film 34 lying thereon also show the individual layers forming the composite film. The plastic composite film 34 has an oxygen barrier layer 36 , preferably made of polyvinyl alcohol (EVOH) and a sealing layer 38 , preferably made of peelable polyethylene and an adhesive layer 37 , preferably made of modified polyethylene. It has been shown that the inner coating of the carrier material forming the food packaging can be carried out as extremely thin. The film thickness is preferably in the range of the residual wall thicknesses in the base radii between 25 and 30 µm.

The plastic composite film 34 can also be constructed and its behavior controlled so that it can be detached from the cardboard carrier after use of the packaging, so that pure components are available for disposal or recycling. According to the invention, the finger hole recess GM also serves this purpose.

After leaving the forming station FS, the cardboard blanks 10 to be connected run through the filling station along the filling section BS, during which they are filled with the foodstuffs to be packaged. The transport of the contiguous cardboard blanks 10 takes place in cycles, as it were, through the common system. From the filling line BS, the filled cardboard blanks 10 run into the vacuuming and sealing station VS, in which they are accommodated by the lower part 16 by means of appropriate mold inserts (see FIG. 6). Such a vacuum or sealing station of the conventional type consists of a lower part 16 and an upper part 18 , which are moved together and moved apart in a clocked manner. The lower mold 16 preferably has a profile for completely receiving the cardboard blanks 10 designed according to the invention such that the edge flanges of the trays can be supported in a sealed manner. The upper part is designed so that the heating plate 74 having a line pattern can receive movable in the vertical direction Rich.

The line pattern is designed so that it defines surface areas on which a sealing of the cardboard cut edge flange with the cover film 20 is to take place.

FIGS. 6 to the function of such a rungs- Vakuumie or show sealing tool according to the invention used. Well-known and proven conventional systems with minor changes can also be used for this process. Fig. 6 shows the sub form 16 with the web-like inserts 66 , the shape of a cross-section of the saddle forming between two adjacent edge flanges of the cardboard blanks 10 is adapted so that when the tool halves 16 and 18 are closed, the connected cardboard blanks 10th are positively supported by the intended mold insert 58 whose surface contour corresponds to the shape of the other cardboard blank. With 70 seals are referred to, against which the edge flanges or the saddle webs of the contiguous cardboard blanks 10 in the collapsed state of the tool 16 and 18 le, so that vacuuming of the individual cardboard blanks, which already contain the food in this state, can be carried out.

With 74 heating devices are designated, which are accommodated accordingly a pattern aligned with the edge webs in the upper tool half 18 , so that in the collapsed state of the tool halves 16 and 18 a welding of the cover film 20 with the relevant edge flanges of the individual container takes place in such a way that a continuous sealing surface is created. At this point it should be emphasized that a commercially available vacuum station can be used, in which, after evacuation, fumigation, for example with the usual gas mixture N ₂ / CO _2, usually in a ratio of 70:30, can be used. The in the upper part of the tool 18 be sensitive heating plate 74 is preferably formed with a relief-shaped sealing webs, the cover film being sealed with heat and pressure by the sealing coating of the peripheral edge flange and the resulting saddle webs of the connected cardboard blanks.

In Fig. 7 it is shown how now the food-filled, sealed and coherent Kartonzu cuts 10 have left the vacuuming and sealing station.

As can be seen by the selected hatching, the entire plastic composite film 34 is welded to the intended sealing surfaces with the cover film 20 . Le diglich in the area of the designated recessed grip in the rear flange area (seen in the direction of travel), the sealing with the plastic composite foil 34 with the cover film 20 is prevented by a special configuration of the sealing tool. This makes it possible, using the punched-out hole in the rear edge flange GM and the cover film 20 not sealed at this point with the plastic composite film 34 , to later remove the film cover or to remove the plastic composite film from the cardboard box 10 .

After leaving the vacuuming and sealing station VS, the filled cardboard blanks connected via the cover film and plastic composite film 34 are fed to a preferably two-stage separating system 80 , 81 .

It is also possible to use a complete punching and separation of the individual food packaging. In the case of a complete punching, the second stage of separation is therefore omitted. After leaving the singling station, the individual carton blanks are available as shown in FIG. 8.

With the above food packaging it is possible depending on the desired shape, by on average around 20 g per food packaging  save more recyclable plastic, d. H. about 70% of what occurs with conventional packaging of this type.

The working width of the device is a matter of course not limited. However, it has been shown that the widths should be at least about 420 mm to the Economy of the device on a particularly ho to maintain your level.

The cover film 20 is preferably also made of a plastic composite film 34 , which contains an oxygen barrier layer, which on the side facing the cardboard cut is preferably covered by a peelable plastic layer made of modified polyethylene. This layer then forms the seal with the plastic composite film 34 via sealing webs of the edge flanges.

The film or the heating or sealing element 72 facing is preferably formed from a film quality with a special high melting point or a heat-blocking layer, which preferably contains polyethylene and which lies above the oxygen barrier layer, in order to seal and seal with the lower part for a sufficient shape and To ensure surface stability during the sealing process. Since the gel layers of both the cardboard blank surface and the lid film 20 are preferably "peelable" to one another, the sealing of these two sealing layers creates a firm connection that can largely be peeled off by hand without destroying the cardboard blank film 34 (see FIG. 9 ).

Of course, be different from the previous be written embodiments possible without the Grundge thank to leave the invention. So it is self-evident of course, the number of feeds lined up  Cardboard blanks per row or work cycle, especially for riieren.

It is also conceivable that the plastic blanks after leaving the forming station FS via a special whose device was made sterile or sterile. Here it is advantageously a so-called called "hydrogen peroxide shower".

Due to the method according to the invention applied to both the oxygen-tight plastic composite film and the oxygen-tight cover film 20 , a composite combination of films from the polyolefin group can be used. This composite combination can be recycled as a monofilm. It has been shown that this regranulate can be used as filling material in the field of PE heavy film production.

Due to the inner coating made by means of the plastic composite film, the stability of the cardboard blank is considerably improved, particularly via the edge flanges designed according to the invention. After staring, the plastic composite film 34 loses considerable flexibility and additionally stiffens the entire carton blank over the edge flanges.

Through the subsequent sealing with the cover film The carton is added to the circumferential edge flanges cut an additional connection stiffness or ver stiffness.

An extremely secure seal with the one with a lock laminated cardboard blanks lined with the barrier layer cover film according to the invention created that the circumferential edge flange close together, so-called saddle bars with egg  form a sealing surface, which is increased to a double than with conventional edge flanges.

Since the entire available sealing surface, which is heat-laminated with the sealing side of the barrier film plastic bundle film 34 , is available as a sealing surface with the cover film 27 , there is always a sufficiently wide area for the formation of a secure one by the individualization of the packs only after sealing Seal seam maintained.

With individually fed carton blanks that do not have this particular design of the edge flange according to the invention, due to tolerances when fixing the carton blanks in the process or due to the manufacturing-related fluctuations in the carton blank design, a uniformly wide and thus sufficient secure sealing surface cannot be achieved. The separation of the oxygen-tight film inner component from the actual stability-giving cardboard blank is a further essential point of the invention (see FIG. 9). The plastic composite film lining the inside of the cardboard blank is heat-bonded to the fibers of the inner walls and the bottom of the cardboard blank.

By known methods, for example the Multivac Skin system, in which the heated, thus made plastic Plastic composite film with the specially trained Ka Schierschicht, which is preferably a Surlyn blend of Dupont company or a mixture (PE type) with particularly high hem (preferably over 20%) ent ethylene vinyl acetate holds, the plasticized composite film is through the corresponding pressure difference to the cardboard blank inside pressed surfaces and can in the fibers of this inner surface penetration.  

The lidding film 20 is firmly connected to the lower part of the packs via the circumferential edge flanges and the saddle bars of the row-like connected cardboard blanks, which are coated with a sealing layer as described in the method, after evacuation or gassing in the sealing station.

The intended semi-oval punching (GM) of the rear edge flange lying in the transport direction and the ent speaking design of the sealing tool in this loading rich creates the possibility of a so-called Griffla cushions that are not covered with liner at this point sealed lidding film is formed on the intended Grip hole trough GM the entire composite from the then pure To remove the cardboard blank, which is then sorted by type is stable.

It belongs to the field of application of food packaging also peeling off the cover film from the sealing bars to Open the package to its contents easily and without any work to be able to remove stuff. This can be done through a special Design of the sealing tool in the sealing station oh a major changeover.

In this case, the consumer loosens the cover film from the sealing surfaces until he can easily remove the contents (see Fig. 10). The plastic composite film and the not completely peeled-off cover film are then detached from the actual cardboard blank on the grip hole recess provided for this purpose via the grip tab. This ensures that the separation is sorted and that the individual materials can be recycled.

The invention thus creates food packaging in the form of a stable cardboard blank with one peripheral peripheral flange, which according to the invention be  is specially designed and by means of a preference wise oxygen-blocking cover foil a hermetically the container is closed.

The carrier shell is made of cardboard and carries innensei tig in the area of the flaps designed for edge flanges an oxygen-saving plastic film for sealing is suitable with the cover film.

A method, a device, is also described device for the production of an oxygen-tight food packaging, whereby preformed and dimensionally stable cardboard cuts are fed from a dispenser system or in the If used via a so-called tray sealer, d. H. from the donor directly to the trans port chain of a tray sealer can be used. This card sound cuts are made in a molding station with an art composite film, preferably an oxygen barrier layer contains, lined.

Arranged in a row close together Cardboard blanks are used to increase stability Crosspieces that connect to the edge flanges of the container to coincide with one another after undressing connected, so that the containers side by side other and synchronously clocked packaging systems go through and be sealed together.

Claims (23)

1. Food packaging which has a carrier shell with a peripheral edge flange which is lined on the inside with a plastic composite film and the carrier shell interior is hermetically sealed by means of a preferably oxygen-blocking cover foil, characterized in that the carrier shell is a cardboard blank ( 10 ), the edge flange ( 52 ) has individual edge flange segments ( 54 ) for fastening the cover film ( 20 ) and the edge flange ( 52 ) is shaped on the outside so that the edge flange segments ( 54 ) are flush with one another in the sealing position. 2. Food packaging according to claim 1, characterized in that the plastic composite film ( 34 ) a Sau erstoffsperrschicht ( 36 ) preferably made of polyvinyl alcohol and a sealing layer ( 38 ) preferably made of peelable polyethylene and an adhesive layer ( 37 ), preferably from a modified polyethylene , in particular a copolymer of ethylene with 6% methacrylic acid, which is partially (50%) neutralized with Na or zinc ions (Surlyn A). 3. Food packaging according to claim 1 or 2, characterized in that the cover film ( 20 ) is formed from a plastic composite film ( 34 ) which on the side facing the cardboard blank ( 10 ) has a preferably peelable plastic layer, preferably made of polyethylene and at least one overlying it acid barrier layer, preferably made of polyvinyl alcohol and a covering heat barrier layer, for example made of polypropylene. 4. Food packaging according to one of claims 1 to 3, characterized in that the Kunststoffverbundfo lie ( 34 ) has an initial thickness in the range between 100 and 150 microns depending on the depth of form. 5. Food packaging according to one of claims 1 to 4, characterized in that the Kunststoffverbundfo lie ( 34 ) which lines the cardboard blank ( 10 ) is identical to the plastic composite film which covers the edge flange ( 24 ). 6. Food packaging according to one of claims 1 to 5, characterized in that the cardboard blank ( 10 ) consists of a recyclable, preferably two-ply cardboard. 7. A process for the oxygen-tight packaging of food, in particular in a food packaging according to one of claims 1 to 6, in which cardboard cuts cycle through a forming station (FS) and a filling section (BS), which a vacuuming and sealing station (VS ) is connected downstream, characterized in that the erected carton blanks ( 10 ) are arranged in rows in the forming station (FS). 8. The method according to claim 7, characterized in that the cardboard blanks ( 10 ) with erected Randflan rule's ( 52 ) of the forming station (FS) are fed in rows. 9. The method according to claim 8, characterized in that the edge flange segments ( 54 ) of the edge flange ( 52 ) are broken before insertion into the forming station. 10. The method according to any one of claims 7 to 9, characterized in that the edge flanges ( 52 ) in the Formsta tion (FS) are pressed into their sealing position so that the edge flanges ( 52 ) of the adjacent Kartonzu cuts ( 10 ) lie close together . 11. The method according to any one of claims 7 to 10, characterized in that the lining of the inner surface of the cardboard blanks ( 10 ) is carried out in rows and by means of a plastic composite film ( 34 ) covering the entire sealing surface of the edge flanges ( 52 ), with the molding being followed Plastic composite film ( 34 ) the transport is carried out synchronously through a transport chain ( 48 ) to the filling station (BS). 12. The method according to claim 11, characterized in that the plastic composite film ( 34 ) is formed by producing a pressure difference in the cardboard blank ( 10 ) and is heat-laminated with the edge flanges ( 52 ) and the inside of the cardboard blank ( 10 ). 13. The method according to any one of claims 7 to 12, characterized in that through the lining plastic composite film ( 34 ) related Kartonzu cuts ( 10 ) in the vacuum and sealing station (VS) with a cover film ( 20 ) flange over the edge ( 52 ) preferably welded continuously. 14. The method according to claim 13, characterized in that the cover film ( 20 ) with the plastic composite film ( 34 ) in the region of a gripping recess (GM) formed from the trailing edge flange of the cardboard blanks, starting from the inner edge of the edge flange ( 24 ) only over a partial area (TB ) which is welded into the overlap extending into the gripping recess (GM). 15. An apparatus for performing the method according to any one of claims 7 to 14 in a device for the clocked transport of the plastic composite film ( 34 ) in the cardboard-clad linings lined on the other side through a filling section (BS), a downstream vacuum and sealing station (VS) and one Ver single station ( 80 , 81 ), characterized in that at least bilaterally adjacent cardboard blanks ( 10 ) connected via edge flanges ( 52 ) in the filling section (BS) can be fed in the same cycle via a transport device of the vacuuming and sealing station (VS). 16. The apparatus according to claim 15, characterized in that for the adjoining edge flanges ( 54 ) to prevent uncontrolled deflection to additional support and guide devices, preferably as in the form of vertically aligned webs are seen, which are preferably adjustable in height. 17. The device according to one of claims 15 or 16, characterized in that after taking over the related cardboard blanks ( 10 ) by the Transportket te ( 48 ) suitable for forming the plastic composite films from plastic composite film ( 34 ) from egg ner endless dispenser roll ( 33 ), which is arranged essentially vertically above the inlet section, is pulled through a deflection roller over the cardboard blanks ( 40 ) connected by adjacent edge flanges ( 52 ) or saddle-shaped supports. 18. Device according to one of claims 15 to 17, characterized in that the over the edge flanges ( 52 ) and saddle webs ( 42 ) of the cardboard blanks ( 10 ) drawn plastic composite film ( 34 ) through sealing webs ( 74 ) of the forming station (FS) with the edge flanges ( 52 ) or the saddle-shaped support of the connected Kartonzu cuts ( 40 ) is welded or sealed in a clock-controlled manner. 19. The device according to one of claims 15 to 18, characterized in that the plastic composite film ( 34 ) connected to the edge flanges ( 54 ) and saddle bars ( 42 ) is transported endlessly by the clock-controlled forward movement of the transport device through the molding station (FS). 20. The apparatus according to claim 19, characterized in that the plastic composite film ( 34 ) by a heating plate ( 72 ) of the molding station (FS) made plastic and so heated by means of pressure difference is drawn into the Kartonzu sections. 21. The apparatus according to claim 20, characterized in that a support belt ( 50 ) rotates synchronously with the transport device, with which the cohesive Kartonzu cuts are supported in particular in and after the filling section (BS) from below. 22. Device according to one of claims 15 to 21, characterized in that the vacuuming and sealing treatment station (VS) has a lower tool part ( 16 ) for the precise recording of the cardboard blanks and a heatable res tool upper part ( 18 ) with which the Roll ( 22 ) endlessly into the opened tool, the cover film ( 20 ) can be pressed against the saddle webs ( 42 ) or the peripheral edge flanges and can be welded under the effect of heat to the plastic composite film ( 34 ). 23. Connected cardboard blanks each with a running edge flange ( 52 ), characterized in that cardboard blanks ( 10 ) hang together via their lining foil, the respective edge flanges ( 54 ) having edge flange segments, the edge flange segments close flush in their sealing position, with adjacent cardboard blanks are integrally connected to one another via their adjacent edge flanges ( 54 ).