EP3795492A1 - Recyclable package, in particular square ended bag - Google Patents

Abstract

Packaging (1), in particular block bottom bag, which has a bottom area (6) and a head area (5) and a side area (7) running between them and which has an inner layer (2) made of a first packaging material and an outer layer (3) made of a second packaging material wherein in the bottom area (6) the inner layer (2) and the outer layer (3) are connected to one another, in particular glued, and adjacent to the bottom area (6) in the side area (7) the inner layer (2) is detached from the outer layer ( 3) runs towards the head area (5) and adjacent to the bottom area (6) in the outer layer (3) a separating device (8) is formed which serves to separate the outer layer (3) from the bottom area (6).

Description

Technical field

The invention relates to packaging which is produced as a mixed product from paper and plastic.

background

If such a packaging mentioned at the beginning is used, for example, for the transport of food for animals and humans, a material mix of paper and plastic is often used at present. Both materials have different properties that affect the manufacture of the packaging on the one hand and the packaging itself on the other. In this way, web-shaped paper can be easily processed into a so-called block-bottom bag on block-bottom bag machines and printed with relatively little effort. However, paper has only inadequate barrier properties for packaging applications in which the packaged goods are e.g. moist and / or greasy or also emit odors. The same applies to the protection of the packaged goods from environmental influences. In order to obtain the required barrier properties, a paper extrusion-coated with plastic or a paper with a laminated plastic film is usually used.

This common, so-called mixed product packaging, however, does not allow any, in particular ecological, single-type separation, disposal or recycling of the paper or plastic components of the packaging.

Against this background, the invention has set itself the task of providing a packaging in which the problems discussed above are overcome. In particular, the packaging should enable a largely pure separation of paper and material so that these materials can be recycled separately.

Summary of the invention

This object is achieved by a packaging according to claim 1. The subject matter of the invention is therefore a packaging, in particular a block bottom bag, said packaging having a bottom area and a head area and a side area running between them and the packaging having an inner layer made of a first packaging material and an outer layer made of a second packaging material, the inner layer in the bottom area and the outer layer are connected to one another, in particular glued, and adjacent to the bottom area in the side area, the inner layer runs detached from the outer layer towards the head area and a separating device is formed in the outer layer adjacent to the bottom area, which separates the outer layer from the bottom area serves.

This object is achieved by a method for producing a packaging according to claim 6. The subject matter of the invention is therefore a method for producing a packaging, in particular a block bottom bag, the packaging having a bottom area and a head area and a side area running between them, wherein according to the method an inner layer made of a first packaging material and an outer layer made of a second packaging material overlap are approximated, preferably in the form of two webs of material, and before the inner layer and the outer layer are brought together in the outer layer adjacent to that area which is intended to form the bottom area, a separating device is formed in that area which is intended to form the side area is, and between the inner layer and the outer layer, an adhesive is introduced at that area which is intended to form the bottom area and there the inner layer is glued to the outer layer.

The packaging according to the invention has the advantage that, apart from the relatively small base area, a substantial part of the packaging can be dismantled into its two layers, from which the packaging is made up. The layers separated from one another in this way can be introduced separately from one another into the disposal and, if necessary, recycling processes available for this purpose. Only the relatively small portion of packaging in the bottom area may have to be disposed of separately because there is an essentially permanent connection between the inner layer and the outer layer.

Further, particularly advantageous configurations and developments of the invention emerge from the dependent claims and the following description.

The inner layer preferably consists of a plastic film or a plastic film composite. A combination of a metallic layer or such layers and plastic (layer (s)) can also be used. This allows the use of a barrier layer optimized for the respective application purpose, in particular realized by a plastic film, which is in direct contact with the packaged goods and develops its special barrier properties there. The property of the inner layer can also be optimized for puncture resistance through the special layer material selection.

The outer layer preferably consists of paper or a paper composite, e.g. of several or different paper layers, which can be flat or intrinsically shaped or structured.

However, other arrangements are also conceivable, such as a plastic film on the outer layer and paper as the inner layer. This can be of interest if, for example, plastic should not come into contact with the packaged goods.

Instead of paper, cardboard can of course also be used.

Paper as the outer layer can also have recesses, openings or windows.

The separating device can be formed, for example, by a tear-open tab or a tear-open thread integrated into the outer layer, or also by a material weakening produced, for example, with the aid of an embossing tool. However, it is preferably implemented as a tear-open perforation in the outer layer because this is a technically reliable and cost-effective solution which at the same time is also as easy to use as possible for the user.

In the head area, the outer layer can be detached from the inner layer, in particular if, when the packaging is being filled, there is no risk of the packaged goods being able to penetrate between the outer layer and the inner layer. If this is to be avoided in any case, it is advantageous if the inner layer is connected to the outer layer in the head area. This connection can be achieved by exposure to heat and pressure the plastic film as the inner layer to the paper outer layer. For this purpose, however, an adhesive is preferably introduced between the inner layer and the outer layer, so that the two layers are glued to one another in the head area.

After the packaging has been filled, it can be closed by turning over part of the head area. The head area can also be completely closed, which can be achieved, for example, by heat sealing the adjacent surfaces of the plastic inner layer or by gluing with adhesive.

When producing the packaging, the production method discussed below, in particular for producing a block bottom bag, can be used. As discussed, the finished package has a bottom area and a head area and a side area extending therebetween. According to the method, an inner layer made of a first packaging material and an outer layer made of a second packaging material are brought closer to one another, preferably in the form of two material webs which are unwound from storage rolls.

Before the inner layer and the outer layer are brought together, the separating device is incorporated into the outer layer in that area which is intended to form the side area, adjacent to that area which is provided for forming the bottom area. Furthermore, adhesive is introduced between the inner layer and the outer layer in that area which is intended to form the bottom area. With the help of the adhesive, which, depending on the arrangement or procedure, was applied either to the side of the inner layer that faces the outer layer, or otherwise to the side of the outer layer that faces the inside, or to both layers on those facing each other Sides was applied, the inner layer is glued to the outer layer where the adhesive is located. This can also be referred to as strip bonding. The adhesive can be applied over the entire surface, point-like, grid-like, strip-like or lamellar-like, etc. in the said area.

If the outer layer and the inner layer are also to be connected to one another in the head area, as discussed, it is advantageous if, before the inner layer and the outer layer are brought together, adhesive is applied to the area that is intended to form the head area, and there the inner layer with the Outer layer is glued. Also one of the measures listed in the previous paragraph can be used for this purpose.

The strips of adhesive run in the bottom area, possibly also in the head area, transversely to a web direction along which the inner layer and the outer layer are unwound from their storage rolls.

The inner and outer layers that are connected to one another in the form of strips, leaving the side area free, are subsequently separated by machine from the composite of outer-layer web and inner-layer web to the packaging length. Subsequently, said composite is mechanically brought into the shape of the packaging by laying and producing a glued longitudinal seam. The tightly sealed bottom area is also produced by gluing the parts of the interconnected inner and outer layers that are placed one on top of the other.

According to the method, after one of the preceding method steps, the packaging can be tightly closed or glued in its head area after being filled with a packaged item.

When the packaging is used by a user, the user must first open the packaging. This can preferably be done by cutting away the head area with the aid of a cutting tool, such as a pair of scissors. In order to guide the cutting line, the packaging can have a marking on its outer layer, which shows the user where to insert his cutting tool so that the head area can be cut away completely. This ensures that the inner layer and the outer layer at the upper end of the opened packaging are no longer glued to one another and can be gripped separately from one another. This cut-away strip of the head area is usually relatively small compared to the rest of the packaging and is therefore negligible in the amount of waste.

As soon as the packaging has been emptied, the user can devote himself to the aspect of feeding the packaging components to a recycling system, which in the domestic as well as public environment usually consists of a separate container for paper and a container for plastic. In order to separate the outer layer from the inner layer, the user only has to grasp the packaging with one hand on the bottom area and with the other hand on the head area on the outer layer and both hands from each other move away. The outer layer separates from the bottom area as planned along the tear perforation. After completion of the separation process, the user holds the outer layer in one hand and the inner layer with the bottom area in the other hand, which makes further handling considerably easier, as he then immediately puts the two separated packaging parts in the recycling container provided for them can dispose of.

These and further aspects of the invention emerge from the figures discussed below.

Brief description of the figure

Fig. 1

einen kopfseitig offenen Blockbodenbeutel gemäß der Erfindung;

Fig. 2

einen Schnitt durch den Blockbodenbeutel gemäß der Figur 1;

Fig. 3

den Blockbodenbeutel 1 gemäß der Figur 1 mit verschlossenem Kopfbereich;

Fig. 4

ein ebenes Zwischenprodukt für die Herstellung des Blockbodenbeutels gemäß der Figur 1.

The invention is explained in more detail below with reference to the attached figures using exemplary embodiments, to which the invention is not limited, however. The same components are provided with identical reference symbols in the various figures. It show in a schematic way:

Fig. 1

a block bottom bag open at the top according to the invention;

Fig. 2

a section through the block bottom bag according to FIG Figure 1 ;

Fig. 3

the block bottom bag 1 according to the Figure 1 with closed head area;

Fig. 4

a flat intermediate product for the production of the block bottom bag according to FIG Figure 1 .

Description of the exemplary embodiments

In the Figure 1 a block bottom bag 1 is shown, which has an inner layer 2 made of a plastic film and an outer layer 3 made of paper. A rear fold 4 and a front fold 5 as well as a head area 5, which surrounds a filling or removal opening peripherally, and a flat bottom area 6, hermetically sealed by gluing the previously folded wall areas, can be clearly seen A side area 7 extends from the bottom area 6. The side area 7 extends up to the edge at which the bottom area 6 begins.

Approximately five millimeters above the bottom area 6, the outer layer 3 has a tear-open perforation 8 (one or two lanes) extending circumferentially along the entire side area 7 as a separating device. The separation device should sensibly be located in a range from a few millimeters up to approximately three centimeters above the bottom area 6 in order to be able to detach as large a proportion of the outer layer 3 as possible from the bottom area 6.

In contrast to the outer layer 3, the inner layer 2 is designed over the entire surface and serves as a barrier against fat and moisture.

In the Figure 2 is a sectional view of the in FIG Figure 1 illustrated block bottom bag 1 visualized, with one in the Figure 1 The sectional plane shown intersects the block bottom bag 1 along the two larger side walls of the side area 7. FIG. 2 shows the sectional view in the viewing direction according to that in FIG Figure 1 arrow P shown, which is oriented normal to the cutting plane. The direction of the arrow P is determined with the aid of a Cartesian coordinate system consisting of the X and Y axes, the two axes X and Y running in the cutting plane and the arrow P being oriented normally on both axes X and Y in the direction of the cutting plane. Where the two larger side surfaces of the side area 7 are intersected by the cutting plane, cutting lines S are shown to visualize this fact. Consequently, in the Figure 2 only the rear fold 4 is visible.

Furthermore shows the Figure 2 in strongly distorted proportions that the inner layer 2 and the outer layer 3 are glued to one another in the head area 5 with the aid of an adhesive 9. This adhesive bond extends along the entire circumference of the head region 5 and ensures that when the block bottom bag 1 is filled with packaged goods, the packaged goods cannot penetrate between the inner layer 2 and the outer layer 3. In the same way, the outer layer 3 is also essentially glued over a large area with the aid of the adhesive 9 in the floor area. Can be clearly seen in the Figure 2 also that the inner layer 2 and the outer layer 3 are not glued to one another in the side area 7, but are present detached from one another.

Finally, it should also be mentioned that the dash-dotted line 10 indicates the lower limit of the head region 5, that is to say the limit of the bonding zone. Adjacent to this, an auxiliary line 11 or the like can be visualized on the outer layer, which allows the user to separate the head area 5 with scissors and to open the packaged goods space below on the head side. Such an auxiliary line 11 is printed on the outer layer 3 and in the Figure 3 shown, with the Figure 3 the block bottom bag 1 with closed Head area 5 shows. The head area 5 was hermetically sealed here by heat-sealing areas of the inner layer 2 that were pressed against one another.

In the Figure 4 an intermediate product 12, which is produced for the production of the block bottom bag 1, is shown. This is the inner layer 2 and the outer layer 3, which are glued together in strips with the help of said adhesive 9, lying flat against one another in those areas on which the head area 5 and the bottom area 6 are produced in a later work step on a block bottom bag manufacturing machine becomes. The tear perforation 8, which was produced in the outer layer 3 before the inner layer 2 was glued to the outer layer 3, can be clearly seen here again. The dash-dotted lines 10 again mark the limits of the spread of the adhesive 9 which was introduced between the inner layer 2 and the outer layer 3. This is indicated here with the help of crosses or stars.

When using the block bottom bag 1, the head area 5 is first cut off along the auxiliary line 11. The packaged goods can then be removed and, after the block bottom bag 1 has been emptied, the outer layer 3 along the tear perforation 8 can be separated from the bottom area 6, that is, from a large part of the inner layer 2, and disposed of or recycled separately.

Finally, it should be mentioned that the circumferentially closed shape of the block bottom bag 1 is obtained with the help of a longitudinal seam, not explicitly shown in the figures, with the aid of which the longitudinal edges of the intermediate product 12 are glued to one another in a slightly overlapping manner, so that a tubular basic shape of the block bottom bag 1 is obtained .

Finally, it is pointed out once again that the figures described in detail above are only exemplary embodiments which can be modified in the most varied of ways by the person skilled in the art without departing from the scope of the invention. For the sake of completeness, it is also pointed out that the use of the indefinite article “a” or “an” does not exclude the possibility of the relevant features also being present several times.

Claims (9)

Packaging (1), in particular a block bottom bag, said packaging (1) having a bottom area (6) and a head area (5) and a side area (7) running between them and the packaging having an inner layer (2) made of a first packaging material and an outer layer (3) made of a second packaging material, wherein in the bottom area (6) the inner layer (2) and the outer layer (3) are connected to one another, in particular glued, and adjacent to the bottom area (6) in the side area (7) the inner layer ( 2) runs detached from the outer layer (3) towards the head area (5) and, adjacent to the bottom area (6), a separating device is formed in the outer layer (3), which separates the outer layer (3) from the bottom area (6) serves. Packaging (1) according to claim 1, wherein the inner layer (2) consists of a plastic film or a plastic-film composite. Packaging (1) according to one of claims 1 to 2, wherein the outer layer (3) consists of paper or a paper composite or of cardboard. Packaging (1) according to one of the preceding claims, wherein the separating device is formed by a tear-open perforation (8). Packaging (1) according to one of the preceding claims, wherein in the head region (5) the inner layer (2) is connected, preferably glued, to the outer layer (3), particularly preferably the packaging (1) is closed. A method for producing a packaging (1), in particular a block bottom bag, the packaging (1) having a bottom area (6) and a head area (5) and a side area (7) running between them, wherein according to the method: - an inner layer (2) made of a first packaging material and an outer layer (3) made of a second packaging material are brought closer to one another, preferably in the form of two material webs, and
before merging the inner layer (2) and the outer layer (3): - In the outer layer (3) adjacent to that area which is intended to form the bottom area (6), a separating device (8) is formed in the area which is intended to form the side area (7), and - An adhesive (9) is introduced between the inner layer (2) and the outer layer (3) at that area which is intended to form the bottom area (6), and there the inner layer (2) is glued to the outer layer (3) . The method according to claim 6, wherein before the inner layer (2) and the outer layer (3) are brought together, the adhesive (9) is applied to that area which is intended to form the head area (5) and there the inner layer (2) with the Outer layer (3) is glued. Method according to one of Claims 6 to 7, the shape of the packaging being produced by laying the inner and outer layers glued together and by producing a glued longitudinal seam, and a tightly closed bottom area (6) by gluing the parts of the glued together inside that are placed one on top of the other - and outer layer (2, 3) is generated. Method according to one of the preceding claims 6 to 8, wherein the packaging is tightly closed or glued in its head area (5) after being filled with a packaged product.

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