EP4308473A1

EP4308473A1 - Bag made of paper and a method and a device for producing a bag made of paper

Info

Publication number: EP4308473A1
Application number: EP22712379.1A
Authority: EP
Inventors: Jörg Christian THIES; Frank Sander
Original assignee: Windmoeller and Hoelscher KG
Current assignee: Windmoeller and Hoelscher KG
Priority date: 2021-03-19
Filing date: 2022-03-10
Publication date: 2024-01-24
Also published as: WO2022194657A1; US20240150083A1

Abstract

The invention relates to a bag (100) made of paper having a first layer (101) and a second layer (102), which are connected to one another at their side edges and form a filling space; the bag comprises a block or cross bottom (105) on its closed end, and at its open end, via which the filling space can be filled, the transverse edges (107, 108) of the first and the second layers end at the same height; at least one piece of paper (110) which extends beyond the transverse edges of the first and the second layer is connected to the first layer; the piece of paper is positioned in particular on the side of the first layer facing away from the filling space.

Description

Paper bag and a method and device for manufacturing a paper bag

The invention relates to a paper bag according to claim 1 and a method and a device for producing a paper bag according to claims 7 and 8, respectively.

Bags made of paper have been known for decades and are used to transport a wide variety of products, for example goods purchased in retail stores.

The starting point of the present invention are such bags that comprise a first layer and a second layer of paper, which are each connected to one another at their side edges. These two layers form a filling space into which products can be transported. One end of these bags is a bottomed end. The product can then be filled in via the second, open end.

The disadvantage of this type of bag, however, is that the goods to be transported are often voluminous, so that the open end is often wide open after the products have been filled in, so that the products are not only exposed to the weather but also to the prying eyes of passers-by , especially if the products come from clothing retailers. However, if you want to roll up the open end in the manner of a bag of bread, additional paper material is required. In addition, the products could be damaged. The object of the present invention is therefore to propose a bag, a manufacturing method and a manufacturing device which at least partially eliminate these disadvantages.

According to the invention, this object is achieved by all the features of claim 1. Possible developments of the invention are specified in the dependent claims. The present invention relates to a bag made of paper with a first layer and a second layer, which are connected to one another at their side edges and form a filling space, the bag comprising a cross bottom at its closed end and at its open end, via which the Filling space can be filled, the transverse edges of the first and second layers end at the same height, with the first layer being connected to a note which extends beyond the transverse edges of the first and second layer, the note being in particular on the side facing away from the filling space Side of the first layer is arranged. Accordingly, the invention relates in particular to bags with a cross bottom, which are formed from a piece of tubing and which are conveyed in a transport direction which runs parallel to the side edges, with the first layer and the second layer both at a first end and at a second end at the same point, and where a cross bottom is formed at one end. This end is preferably the leading end in the production process. The transport direction of the bags during production is at the same time the longitudinal direction or main direction of the bag, which accordingly runs between its two ends. The term cross bottom is understood to mean those bottoms that are created by pulling open one end of the tube piece to form side flaps and side pockets and by folding back parts of the side flaps.

The side edges between the first and the second layer can be designed as simple folded edges or as side folds in which in particular, an inwardly folded strip of paper is provided between the two layers on each side. If a bag has side gussets, the folded bottom is designed in particular as a block bottom. On the other hand, if the bag has no gussets, the bottom is often referred to as a cross bottom. In both cases, the bottom of a filled bag is essentially cuboid.

According to the invention, a note is now connected to the first page and extends beyond the transverse edge of the first and second layer, the note being arranged in particular on the side of the first layer facing away from the filling space. It is now possible to fold this piece of paper over to cover the open end of the bag. Before the bag is used, the note is essentially in the plane of the first layer. Before the filling space is filled, the bag is generally opened, with the bottom, which is often also located essentially in the plane of the first layer, being unfolded. After the bag has been filled, the piece of paper can now be folded over by 90 degrees, for example, but also further. In this way, the filling space is now better protected against the effects of the weather, for example. The folding edge around which the note is folded can be defined by means of a pre-embossing.

It is advantageous if the slip is a separate workpiece which is connected to the first layer by means of a connection, in particular by means of an adhesive connection. The label can thus be applied to the first layer and fastened there, for example after the bag has been completely manufactured. However, it is preferred to apply this before the end of production and in particular before the bottom is molded on. An adhesive connection can take place, for example, using a cold glue, a heat-activatable adhesive (hot-melt adhesive) or by applying an extrudate. An adhesive connection can also be produced by means of a piece of material that is adhesive on both sides, for example with labels that are adhesive on both sides. However, the separate piece of paper can also be connected to the first layer in other ways, for example by means of staples, which are often also referred to as staples. In a further advantageous embodiment of the invention, grip strips are provided which extend beyond the transverse edges of the first and second layer, with the slip having recesses in the region of the grip strips. In this development, the grip strips are used for easier transport of the filled bag. The grip strips can be, for example, cord grip strips, which consist of yarns twisted together. Flat grip strips are also conceivable, which generally consist of paper strips folded over one another several times. It is advantageous if the grip strips are attached to the surfaces of the first and second layer facing the filling space. In order to be able to at least partially cover the filling space, it is provided according to the invention that the note comprises recesses in the area of the grip strips, so that the note can also be folded over through the grip strips. The term "cut-outs" should also include complete separations, which means that the note can be in several parts and can include note sections that are each not connected to another note section.

It is particularly advantageous if the note can be folded over onto the second layer in order to at least partially close the open end. In this case, not only is the open end covered, but the two layers are brought closer together again in the area of the open end, so that the open end is reduced in size by the note pressing the first and second ends together. To do this, the note is folded over a fold at an angle of more than 90 degrees, but less than 180 degrees.

It is also advantageous if at least one adhesive element is attached to the second layer, with which the note can be attached to the second layer when it is folded over onto the second layer, the adhesive element being arranged in particular on the side of the second layer facing away from the filling space . Thus, the adhesive element is preferably arranged on the outside of the bag, just like the note. With the use of an adhesive element, it is now possible to almost close the open end again. The adhesive element can in turn be a double-sided adhesive be tape. A liquefied extrudate or a liquefied pressure-sensitive adhesive can also be applied, which, when cooled again, provide adhesive force for the note. In order to prevent the adhesive effect of the adhesive element from decreasing or other objects from sticking to the adhesive element, a protective element is advantageously provided with which the adhesive element can be covered before it fulfills its intended purpose. The protective element can later be pulled off the adhesive element by the user before the note is folded over, so that the sticky outside of the adhesive element is exposed. The note can then be folded over onto the adhesive element.

The above-mentioned object is additionally achieved by a method for producing a bag made of paper, a paper web being made available which is folded over and connected to itself at its side edges to form a tube, a tube piece being severed from the tube, having a first ply and a second ply joined together at their side edges, respectively, forming a plenum, the length of tubing being molded with a block or cross bottom to form a closed end and leaving an open end, above that the filling space can be filled, with the transverse edges of the first and second layers ending at the same height at the open end, with a note being connected to the first layer which extends beyond the transverse edges of the first and second layer, with the Note is arranged in particular on the side facing away from the filling space of the first layer.

This achieves the same advantages as have already been described in connection with the device according to the invention.

The above-mentioned object is also achieved by a device for producing a bag made of paper, with an unwinding device for unwinding a paper web from a roll, with a tube forming device, with which parts of the paper web can be folded over and connected to themselves at their side edges to form a tube, with a separating device, with which a tube piece with a first layer and a second layer is successively separated from the tube, which is attached to its side edges are each connected to one another and form a filling space, is separable, with a base-forming device for forming a block or cross base on each piece of tubing to form a closed end, with an open end remaining on the tubing piece for filling the filling space, with the open end, the transverse edges of the first and second layers end at the same height, with a tagging device, with which a tag can be applied to the first layer of the hose piece and connected to the first layer, with the tag extending over the transverse edges of the first and second layer extends beyond, the note in particular can be arranged on the side of the first layer facing away from the filling space.

Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination of features mentioned. Within the scope of the entire disclosure, features and details that are described in connection with the method according to the invention apply, of course, also in connection with the device according to the invention and vice versa, so that the disclosure of the individual aspects of the invention is or are always referred to mutually can. The same applies with regard to the features that are described in connection with a bag according to the invention. These features also apply in connection with a method according to the invention and a device according to the invention. The individual figures show: 1 view of a bag according to the invention

Fig. 2 Rear view of the bag of Fig. 1

Fig. 3 floor closing station with several according to the invention

facilities

Fig. 4 Representation of process steps for the production of a bag according to the invention

Fig. 5 bag after carrying out the process steps according to Figure 4

Fig. 6 Completed bag

Fig. 7 Device for opening bags according to the invention

Figures 1 and 2 show perspective views of a bag 100 according to the invention, which comprises a first layer 101 and a second layer 102. These layers 101 and 102 are connected to one another, for example via gussets 103 and 104, as shown in the figures mentioned. At the lower end of the bag 100, a non-visible base 105 is formed, which in the shown unfolded state has a substantially rectangular shape. The bag 100 includes an open end 106 through which the bag can be filled. At this open end 106, the two layers 101 and 102 each have a transverse edge 107 and 108 which, viewed in the direction of the flap of the bag, end on the same flea, which means that the edges lie directly on top of one another when the bag is folded up. A label 110 is associated with the first ply 101 , the label preferably being on the outer surface of the ply 101 . This note 110 extends beyond the transverse edge 107 . The note 110 preferably extends over at least 60% of the width of the bag, in particular over at least 80% of the width of the bag. In the area of the surface in which the first layer and the note overlap, there is the connecting surface 111 for the note on the first layer, the connecting surface being covered with a connecting material which, for example, is a cold glue, a flot-melt adhesive or a double-sided adhesive material. One or more adhesive surfaces 112 are preferably arranged on the second layer 102 . These adhesive surfaces 112 are covered with a protective material 113, for example with silicone-coated paper, so that the adhesive surfaces initially remain inactive.

Furthermore, the bag 100 comprises handle elements 120, which can, however, also be dispensed with. A grip element 120 is preferably arranged on the surfaces of the layers 101 and 102 facing the interior and fastened there. In order to make the attachment more durable, reinforcing tabs 121 can be provided, which are glued to said surfaces of the sheets 101 and 102 and connected to a part of the handle elements 120.

If grip elements 120 are present, it is advantageous if the note 110 includes recesses 122 in the area of the grip elements 120 in order to enable the grip elements 120 to turn them over without being disturbed.

Figure 3 now shows the bag according to Figures 1 and 2, but in which the layers 101 and 102 are pressed together in the area of the open end 106, the protective material 113 has been removed from the adhesive surfaces 112 and the components of the label 110 on the outer surface of the layer 102 and have been attached there by means of the adhesive surfaces 112.

FIG. 4 now illustrates essential method steps for the production of a bag 100 according to the invention. In step a), a section from a paper web 200 can first be seen, which represents the basis for the subsequent bag. The paper web is transported in the transport direction T, which is also the direction of the longitudinal axis of the subsequent bag. The later transverse severing lines 201, along which the later hose is separated into hose sections, are already recognizable. These transverse dividing lines run completely orthogonally to the transport direction T and are designed as straight lines. The broken lines, which run parallel to the transport direction, represent folded edges 202 for the formation of the later side folds. On the back of the paper web 200, ie on the viewer side facing away, adhesive surfaces 112 and protective material 113 are applied in a first method step to each subsequent hose section. In a further step b), which can be carried out before, after or even at the same time as the step described above, grip elements 120 and optionally reinforcement slips 121 are applied and attached to the visible side of the paper web 200 . Subsequently, in a method step that is not shown, a tube is formed from the paper web 200 by folding the edges of the paper web in the direction of the viewer and connecting them to one another. The gussets are inserted at the same time or shortly afterwards. This is followed by a step in which the tube is separated into tube pieces. This can be done with a cutting tool that makes cuts along the lines 201 . As an alternative or in addition, the lines 201 can also be perforated before the grip elements are applied. In the separation step, a piece of tubing can then be torn off from the tubing. In a further step, which does not necessarily take place before the steps described in connection with FIGS. 5 and 6, a base, in particular a block base, is formed.

FIG. 5 shows a bag as presented after the method steps described in connection with FIG. The floor 105 can now be seen in this illustration.

In a final method step, a note 110 is then applied to the bag 100. For this purpose, a note can be separated from a sheet of notes (not shown) and provided with optional cutouts 122 . To carry out this step, one or more punching and/or cutting tools can be provided, which in turn are not shown. An adhesive can then be applied to the label 122 and/or to the area of the first layer 101 to which the label is to be glued. The next step is to place and thus attach the note to the first layer 101. This situation is shown in FIG. FIG. 7 shows a device 1 for producing bags 100. In this figure, the essential components of this device are shown schematically. The device 1 comprises an unwinding device 2 to which the paper web 200 is fed in the form of a roll 4 . Starting from this roll 4 , the material web 100 is fed via guide rollers 5 to an optional cross-cutting station 6 or perforating station 6 . This station 6 can include one or more cross-cutting or cross-perforating knives, not shown in detail, which rotate on a roller 7 . In particular, areas of the lines 201 can be pre-perforated or pre-cut in this station, in which the grip elements 120 will later intersect. Instead of knives, non-contact cutting devices such as a laser cutting device can also be used in this station. In this station 6, the material web 200 can run over a counter-pressure roller 8, which primarily has the purpose of providing the counter-pressure required for the cutting or perforating process. The web is not severed during this cutting or perforating process. In the further course, an optional grip application station 30 is now provided, with which grip elements 120 and reinforcement slips 121 can be attached to the paper web 200 according to the method steps that have been described in connection with FIGS. An adhesive surface application station 31 is also provided downstream of the station 6, with which the adhesive surfaces 112 and the protective material 113 can be applied to the surface of the paper web 200 facing away from the gripping element. The station 31 can also be arranged upstream of the station 6.

The web of material 200 then runs through a nip formed by a further guide roller 5 and a roller designed as a longitudinal glue 26 . This applies glue to a side portion of the material web 3, so that both Side areas are permanently connected to each other after the tube formation, which is described below.

In the following tube forming station 9, a tube 10 is formed from the material web 200 by the material web 200 being folded in laterally by means of guide elements, such as guide plates, so that the edges of the material web then overlap. The subsequently overlapping areas have already been provided with a suitable adhesive by means of longitudinal gluing 26 . Lateral folds can also be inserted while the paper web is being folded. In principle, however, the insertion of the gussets can also take place after the tube formation. The hose 10 is now essentially continued in the transport direction T. After the tube 10 was created, this is in the

Separation station 11 to hose pieces 12 isolated. For this purpose, the hose 10 is passed through the nip of a pair of rollers 13 . One of the rollers of the pair of rollers 13 is designed as a cutting roller. For this purpose, it preferably comprises at least one cutting blade running transversely to the transport direction T, which has recesses in particular in the area of the gripping elements in order not to cut through them. Of course, several individual knives can also be provided, which are spaced apart from one another in the area of the handle elements. The individual knives are nevertheless on a single cutting line and can be shifted relative to the cutting roller.

As the hose continues to advance, it enters the nip of an optional second pair of rollers 14. The rollers of the second pair of rollers can constantly or at least temporarily have a higher circumferential speed than the rollers of the first pair of rollers 13 in order to increase the distance between the piece of hose that was cut off last and the new one to generate the resulting leading end of the hose. The piece of tubing torn from the tubing now enters the bottom folding station 15, the exact structure of which will not be discussed further. In connection with the invention, however, the application station 17 for notes 110 is important, with which the notes can be applied to the bag 110 . This application has already been described in more detail in connection with FIGS.

After the bag is completed, the bottom maker cylinder 16 sets it down on a table 18 . The bags are usually arranged in a vertical position. From this table 18 the bags can then be removed in stacks in a suitable manner.

Claims

patent claims

1. Bag made of paper with a first layer and a second layer, which are connected to each other at their side edges and form a filling space, the bag comprising a block or cross bottom at its closed end and, at its open end, via the the filling space can be filled, the transverse edges of the first and second layers end at the same height, with the first layer being connected to at least one note which extends beyond the transverse edges of the first and second layers, the note in particular the side facing away from the filling space of the most layer is arranged.

2. Bag according to claim 1, characterized in that the note is a separate workpiece which is connected to the first layer by means of an adhesive connection.

3. Bag according to one of the preceding claims, characterized in that

Grip strips are provided, which extend beyond the transverse edges of the first and second layers, the note having recesses in the region of the grip strips.

4. Bag according to one of the preceding claims, characterized in that the slip can be folded over onto the second layer in order to at least partially close the open end.

5. Bag according to one of the preceding claims, characterized in that at least one adhesive element is attached to the second layer, with which the note can be attached to the second layer when it is folded over onto the second layer, the adhesive element being in particular on the filling space is arranged from the side facing the second layer.

6. Bag according to the preceding claim, characterized in that the adhesive element is covered with a protective element before use.

7. A method of making a bag of paper, wherein a web of paper is provided which is folded over and joined to itself at its side edges to form a tube, from which tube a length of tube is severed, having a first layer and a second Layer, which are connected to each other at their side edges and form a filling space, wherein a block or cross bottom is formed on the hose piece to form a closed end, and an open end is left through which the filling space can be filled, wherein at the open end, the transverse edges of the first and second layers end at the same height, with the first layer being connected to a note which extends beyond the transverse edges of the first and second layer, where the note in particular on the dem Filling space facing away from the first th layer is arranged.

8. Device for producing a bag made of paper, with an unwinding device for unwinding a paper web from a Wi- disgusting, with a tube-forming device, with which parts of the paper web can be folded over and connected to themselves at their side edges to form a tube, with a separating device, with which a piece of tube with a first layer and a second layer is successively separated from the tube, which are each connected to one another at their side edges and form a filling space that can be separated, with a base-forming device for molding a block or cross base onto a piece of tubing in each case in order to form a closed end, with an open end remaining on the piece of tubing for filling the filling space , where at the open end the transverse edges of the first and second layers end at the same height, with a slip device with which a slip can be applied to the first layer of the hose piece and connected to the first layer, with the slip extending over the transverse edges The first and the second layer he stretches out, with the slip into special on the side facing away from the filling space Be te the first layer can be arranged.