EP0510307A1 - Method for making a bag with rectangular bottom in filled condition and with gripper means and following this method made bag - Google Patents

Abstract

The present invention relates to a method of making a sack or bag with a rectangular bottom in the filled condition and with a gripping part, and sacks or bags made by this method. To achieve the object of making already known methods more simple, a continuously advanced flat web has applied to it on one side, at intervals of one bag length, two strips of sealing wax parallel to each other and perpendicular to the side edges; four short strips of sealing wax are applied to the rear side at a corresponding point and two reinforcements are adhesively attached over the full surface between the strips of sealing wax. Underneath the first reinforcement, a folded slip is adhesively attached by one side-piece, while the other side-piece is folded back onto it. Underneath the second reinforcement, an area which corresponds to the side-piece is format-glued. An adhesive strip is applied to one side of the flat web. The web is brought together, forming side folds, to make a tube, in such a way that the free side-piece is arranged on the format gluing and that at the same time the two reinforcements are arranged one above the other. The strips of sealing wax are activated and fold edges are pre-scored. Finally, a gripping hole is punched in the region of the superimposed reinforcements. The still open bottom is put on in the usual way after filling of the bag.

Description

The invention relates to a method for producing a sack or bag with a rectangular bottom when filled and with a handle part and sacks or bags produced by this method.

Sacks or bags of this type are known for example from DE-GM 81 15 909 and 82 07 889. However, these known sacks or bags have the disadvantage that the leg-like strips forming a base sheet, which are connected in their central region to the web part provided with the handle hole, are glued over the entire surface or almost over the entire surface to the floor the web part, that is to say in the region of the longitudinal center plane of the sack passing through the floor, considerable stresses are exerted when carrying, which result from the fact that the forces exerted by the web part are introduced into this essentially in the region of a line running centrally through the floor rectangle. In order to avoid this disadvantage, a sack or pouch was described in German patent application 40 12 896.2, which is partially caused by corner turns overlapping side folds is formed and the handle part used consists of a central web part with the grip hole and connected to this side leg-like strips made of flexible material, the drawn bottom is glued or welded in a manner known per se to an inner bar that seals the inner Edges of the corner folds and at least the inner edges of the side folds are connected adjacent to their fold lines, the handle part being inserted into the still open floor and its leg-like strips being at least partially covered by the side folds and glued or welded to them. In this sack or bag, the side of the side leg-like strip of the handle part, which carries the web part provided with the grip hole between them, is not glued to this inner bar, but the side folds overlap the side leg-like strips and are with the inner bar formed by a note this glued or welded through the sides, on which the middle web part is located with the handle part. This sack or bag is therefore characterized by a tunnel, which is formed between the underside of the handle part and the inside of the handle part of the inner bolt. Due to this design, the load is introduced directly into the side walls of the filled sack or bag via the central web part and the leg-like strips connected to it, so that the handle part is able to absorb much greater load-bearing capacity without the bag being damaged or the bottom parts of it be replaced.

However, it has proven to be disadvantageous that the sack or pouch described above cannot be easily and simply manufactured by machine. Also a method described in German patent application P 40 14 600.6 for producing a Sacks or bags with a tunnel of the type described above are relatively complicated.

The object of the present invention is therefore to provide a method for producing a generic sack or bag, with which this can be easily and inexpensively produced by machine in a production line.

According to the invention, this object is achieved by the sequence of methods according to claims 1, 3, 5 and 8.

The method sequences according to claims 5 and 8 correspond essentially to those according to claims 1 and 3. In contrast to the method sequences of claims 1 and 3, however, the method sequences according to claims 5 and 9 have relatively wide strips of reactivable adhesive or Sealing varnish, which in the area of the later gussets each have two triangular flat approaches, which make it possible for the corners of the finished gusseted bag to be additionally glued together after activation of the adhesive or sealing varnish. This results in an improved edge rigidity of the bottom, which leads to an exact and stable formation of the edges in the bottom area of the sack or bag.

In contrast to the previously known methods, the sack or bag produced according to the invention has no cross bottom with an integrated handle or handle parts. A favorable introduction of force is not achieved here by tunneling, but by the folded note that is glued to both side walls below the handle. Advantageously, this can be a simply folded note that does not need to be pre-assembled.

An advantage of the manufacturing method according to claim 1 is that the handle is incorporated directly into the floor during manufacture. As a result, additional operations, such as the manufacture of handle parts and gluing them on, are not necessary.

A sack or pouch which is produced by one of the methods according to the invention preferably consists of a single material. This improves the recyclability of the sack or bag. The sack or bag is particularly advantageously made of paper.

• Die Figuren 1 bis 8:
  die Verfahrensfolge eines ersten erfindungsgemäßen Verfahrens zur Herstellung eines Sacks oder Beutels, und
• Die Figuren 9 bis 17:
  eine zweite Ausführungsform des erfindungsgemäßen Verfahrens zur Herstellung eines Sacks oder Beutels,
• Die Figuren 18 bis 25:
  eine dritte Ausführungsform des erfindungsgemäßen Verfahrens zur Herstellung eines Sacks oder Beutels und
• Die Figuren 26 bis 34:
  eine vierte Ausführungsform des erfindungsgemäßen Verfahrens zur Herstellung eines Sacks oder Beutels.

Further details and advantages of the invention are explained in more detail below with reference to the exemplary embodiments of the invention shown in the figures. Show it:

• Figures 1 to 8:
  the process sequence of a first method according to the invention for the production of a sack or bag, and
• Figures 9 to 17:
  a second embodiment of the method according to the invention for producing a sack or bag,
• Figures 18 to 25:
  a third embodiment of the method according to the invention for producing a sack or bag and
• Figures 26 to 34:
  a fourth embodiment of the method according to the invention for producing a sack or bag.

First, the individual method steps of the first exemplary embodiment of the method according to the invention for producing a sack or bag - in the present case a paper diaper bag with a kind of pinch-bottom - will be explained with reference to FIGS. 1 to 8.

On a continuously advancing flat web 10 shown in FIG. 1, two strips 12, 14 of reactivable adhesive or sealing wax running parallel to one another and perpendicular to the side edges are applied on the side facing the viewer, spaced apart from one bag length. In Fig. 2, the flat web is shown from the back, the corresponding strips 12 and 14 are shown in dashed lines because they are arranged on the opposite side. On this rear side, a plurality of strips 16, 18, 20 and 22 are applied congruently to the strips 12, 14 arranged on the other side, which strips have essentially the same length and are later intended to glue the bottom region of the side folds to be formed.

In Fig. 3, the flat web 10 is again shown from the front (see. Fig. 1). Between the strips 12, 14, reinforcements 24, 26 are glued onto the entire surface at a distance from one another. These reinforcements are advantageously made of strong cardboard. However, if the material of the flat web 10 as such already has a high tensile strength, the reinforcements 24 and 26 can also be omitted.

A folded slip 28 is stuck on beneath the reinforcement 24. A free leg of this folded note 28 is folded back onto the glued leg. Below the reinforcement 26, format gluing 32 is provided, that of the surface of the free leg 30 of the folded slip 28 corresponds. An adhesive strip 34 is applied to the side edge of the flat web 10.

The flat web 10 is now folded together into a tube with side folds 36 and 38 which, after being cut to size, has the shape indicated in FIG. 4. In Fig. 4a the bag open at the bottom is pulled apart slightly. In the middle is the slip 28 which is glued to the sides of the bag. As is clear from FIG. 4, the web is folded in such a way that the free leg 30 is arranged on the format gluing 32 and that at the same time the two reinforcements 24 and 26 are arranged one above the other.

In the process step shown in Fig. 5, the reactivatable adhesive strips or sealing wax strips 12 and 14 are activated by corresponding heated rollers, i.e. glued together. In addition, sealing wax strips 16 and 18 in the side fold 36 and 20 and 22 in the side fold 38 are glued together.

In the method step shown in FIG. 6, folded edges are pre-grooved. Approximately below the meanwhile activated sealing wax strip 14, a folding edge 40 running parallel to this is pre-grooved, to which a folding edge 42 is pre-grooved parallel to the open end of the bag. From the end points of the folded edge 42 directed inwards, inclined folded edges 44 and 46 are pre-grooved up to the folded edge 40.

According to the method step shown in FIG. 7, a finger hole punching 45 is now provided in the area of the reinforcements 24 and 26.

The diaper bag prepared in this way is then filled from below and then closed in the lower region in a manner known per se, which results in the container 47 shown in FIG. 8. In this container 47, a carrying handle 48 is formed perpendicular to the rectangular bottom of the bag 47 with punched hole punching 45. Such a bag can be placed very well side by side, i.e. Stack face to face and face to face, stack.

The method according to the second exemplary embodiment of the invention can be explained with reference to FIGS. 9 to 17. Here too, a continuously advanced flat web 50, which preferably consists of paper, is assumed, as shown in FIG. 9. At a spacing of one bag length in each case, a strip 52 of reactivable adhesive or sealing wax running perpendicular to the side edges is applied to one side.

10 again shows the back of the flat web 50, in which the strip 52, since it is not visible here, has been shown in dashed lines. On the back of the flat web 50, two short strips 54 and 56 of reactivatable adhesive or sealing wax are placed at the appropriate place, i.e. in an area that partially coincides with the course of the strip 52.

In the running direction of the flat web 50, two incisions 58 and 60 are provided in front of the strip 52 at a distance from one another, as shown in FIG. 11. According to FIG. 12, a grip part 62, which is also preferably made of paper, is glued in the area of the incision 58 such that it projects beyond the strip 52 and the incision 58. This grip part 62 is made from a strip-shaped band by bending the ends by 90 ° educated. The ends of the handle 62 are glued to the flat web 50 up to the incision 58.

In the area of the ends of the handle part 62, a folded note 64 is glued on with one leg in such a way that it rests on the free glued ends of the handle, while the other leg is folded back onto this first leg. A surface is glued below the second incision 60, which surface essentially corresponds to the leg 66 of the folded slip. 13, an adhesive strip 70 is applied to one side of the flat web 50. Subsequently, the web 50 is folded together to form side folds 72 and 74 in such a way that the free leg 66 of the folded slip 64 is arranged on the format gluing 68. After cutting into bag lengths, the bag shown in FIGS. 14 and 14a results. A cutting of the bag in the area of the handle 62 is possible in that the incisions 58 and 60 are already provided in the handle area. As a result, only the part that has not already been cut need be cut through with the respective knife to separate from the next bag. 14a again shows a view from below into the bag, the side walls of the bag being slightly pulled apart. The note 64 becomes visible.

In the method step shown in FIG. 15, the reactivatable strips 52 and in the region of the side folds 72 and 74 the strips 54 and 56 are activated and thereby glued to one another. In the embodiment shown in FIG. 16, fold lines 76, 78 and 80 are grooved again, which correspond to fold lines 42, 44 and 46 in the first embodiment. A fold line corresponding to the fold line 40 is not provided in this exemplary embodiment.

After the usual filling of the bag and the closing of the open bag end by any base, the container 82 results, which is shown in FIG. 17. In this illustration it is clear that the handle 62 with the web part formed above the rectangular bottom lies flat on the floor, which is achieved in that in this embodiment no fold line is provided which corresponds to the fold line 40 of the first embodiment. Of course, such a fold line can also be provided in the present embodiment, so that the web with the handle 62 is vertical, as is shown in the first embodiment in FIG. 9. Alternatively, of course, the first embodiment can also be designed without the pre-grooved fold line 40, so that the handle would lie on the floor as shown in the second embodiment in FIG. 17.

The embodiment shown in FIG. 17 has the advantage that the containers 82 can be stacked on one another without any problems, without the handle 62 having to be folded over with the corresponding overhang first.

The embodiment shown in FIGS. 18 to 25 essentially corresponds to that according to FIGS. 1 to 8.

On a continuously advancing flat web 110 shown in FIG. 18, strips 112 of reactivable adhesive or sealing wax, which are relatively wide and run perpendicular to the side edges, are applied on the side facing the viewer, spaced apart from one bag length. The strip 112 has triangular projecting surface areas 114 according to the configuration shown in FIG. 18. The areas of the adjacent triangular areas 114 correspond the area of the side folds 136 and 138 shown in FIG. 21. Areas 120 and 122 are left out of the strip 112 made of reactivatable adhesive or sealing wax. The arrangement of the recesses 120, 122 not provided with sealing wax likewise results from FIG. 18. In FIG. 19, the flat web 110 is shown from the rear, the corresponding strip 112 being dashed again since it is arranged on the opposite side shown. On this reverse side, strips 112, 118 of sealing wax are applied congruently to the strip 112 arranged on the other side.

20, the flat web 110 is shown again from the front. In the cutouts 120 and 122 of the strip 112, reinforcements 124 and 126 are glued onto the entire surface at a distance from one another. These reinforcements are advantageously made of strong cardboard. They also have a sealing wax coating on their tightly glued side. Here, too, in the event that the material of the flat web 110 already has a high tensile strength, this additional reinforcement can be omitted from the reinforcing sections 124 and 126.

A folded note 128 is stuck on beneath the reinforcement 124. A free leg of this folded note 128 is folded back onto the glued leg. Below the reinforcement 126, format gluing 132 is provided, which corresponds to the area of the free leg 130 of the folded note 128. An adhesive strip 134 is applied to the side edge of the flat web 110.

The flat web 110 is now folded together to form a tube with side folds 136 and 138 which, after being cut to size, has the shape indicated in FIG. 21. In Fig. 21a the bag open at the bottom is slightly pulled apart. In the middle note 128 is shown, which is glued to the sides of the bag.

In the process step shown in FIG. 22, the reactivatable adhesive strips or sealing wax strips 112 together with the flat projections 114 are activated by corresponding heated rollers, that is to say they are glued to one another. In addition, the sealing wax strips 116 and the side fold 136 and 118 are glued together in the side fold 138.

In the method step shown in FIG. 23, the folded edges 140, 142, 144 and 146 are pre-grooved.

According to the method step shown in FIG. 24, a finger hole punching 145 is now provided in the area of the reinforcements 124 and 126.

The diaper bag prepared in this way is then, as usual, filled from below and then closed in the lower area in a manner known per se, which results in the container 147 shown in FIG. 25.

The fourth exemplary embodiment shown with reference to FIGS. 26 to 34 essentially corresponds to the exemplary embodiment according to FIGS. 9 to 17. Here too, a continuously advanced flat web 150, which preferably consists of paper, is assumed, as shown in FIG. 26. At a spacing of one bag length, a relatively wide strip 152 of reactivable adhesive or sealing wax running perpendicular to the side edges is applied to one side. This in turn has three triangular approaches 153 made of reactivable adhesive or sealing wax lying side by side in pairs.

FIG. 27 again shows the back of the flat web 150, in which the strip 152, since it is not visible here, has been shown in dashed lines. On the back of the flat web 150, two short strips 154 and 156 of reactivatable adhesive or sealing wax are applied at the appropriate place, that is to say in an area that partially overlaps in the course of the strip 152. This area corresponds to the area of the triangular surfaces 153 arranged next to one another on the other side.

In the running direction of the flat web 150, two incisions 158 and 160 are provided at a distance from one another in front of the strip 152, as shown in FIG. 28. According to FIG. 29, a grip part 162, which is also preferably made of paper, is glued in the area of the incision 158 such that it projects beyond the strip 152 and the incision 158. This grip part 162 is formed in the same way as the grip part 62. The ends of the handle 162 are glued to the flat sheet 150 up to the incision 158.

In the area of the ends of the handle part 162, a folded note 164 is glued with one leg in such a way that it rests on the free glued ends of the handle part, while the other leg is folded back onto this first leg. Below the second incision 160, an area is glued in format which essentially corresponds to the leg 166 of the folded slip. 30, an adhesive tape 170 is applied to one side of the flat web 150.

Subsequently, the web 150 is folded together to form gussets 172 and 174 in such a way that the free leg 166 of the folded note 164 is arranged on the format gluing 168. After cutting into bag lengths, the bag shown in FIGS. 31 and 31a is obtained.

In the method step shown in FIG. 32, the reactivatable strips 152 with the triangular surfaces 153 and the strips 154 and 156 are activated and thereby glued together. According to FIG. 33, fold lines 176, 178 and 180 are formed which correspond in their arrangement to those according to the exemplary embodiment shown in FIG. 17.

After the usual filling of the bag and the closing of the open bag end by any base, the container 182 results, which is shown in FIG. 34.

The sacks or bags produced by means of the method according to the invention advantageously have no handle parts in the area of the side walls and can therefore be printed over the entire surface.

Claims (9)

Process for producing a sack or bag with a rectangular bottom when filled and with a handle part comprising the following steps: a) on a continuously advancing flat web (10), two strips (12, 14) of reactivable adhesive or sealing wax running parallel to one another and perpendicular to the side edges are applied on one side at a spacing of one bag length, b) at the appropriate place, four short strips (16, 18, 20, 22) made of reactivable adhesive or sealing wax are applied to the back of the flat web (10), c) two reinforcements (24, 26) are glued over the entire surface between the strips (12, 14) made of reactivatable adhesive or sealing wax, d) under the first reinforcement, a folded piece of paper (28) is glued on with one leg, while the other leg (30) is folded back onto this, e) below the second reinforcement (26), a surface (32) is format glued, which corresponds to the leg (30), f) an adhesive strip (34) is applied to one side of the flat web (10), g) the web (10) is folded together to form side gussets (36, 38) so that the free leg (30) is arranged on the format glue (32) and that at the same time the two reinforcements (24, 26) one above the other are arranged h) the reactivatable adhesive strips or sealing wax strips (12, 14; 16, 18, 20, 22) are activated, i) folding edges (40, 42, 44, 46) are pre-grooved, j) a grip hole (45) is punched in the area of the reinforcements (24, 26) lying one on top of the other. Sack or bag according to claim 1, characterized in that it is made from a single material, preferably paper. Process for producing a sack or bag with a rectangular bottom when filled and with a handle part comprising the following steps: a) a strip (52) of reactivable adhesive or sealing wax, running perpendicular to the side edges, is applied to one side of a continuously advanced flat web (50), spaced apart from one bag length, b) at the appropriate place, two short strips (54, 56) of reactivable adhesive or sealing wax are applied to the back of the flat web (50), c) in the running direction of the flat web (50) in front of the strip (52) and parallel to it, two incisions (58, 60) are provided at a distance from one another, d) in the area of at least one of the incisions (58), at least one grip part (62) is glued onto the flat web (50) in such a way that it projects beyond the strip (52) and the incision (58), e) a folded note (64) is glued on with one leg in such a way that it rests on the free glued ends of the handle (62), while the other leg (66) is folded back onto it, f) below the second incision (60), a surface (68) is format glued, which corresponds to the leg (66) of the folded note (64), g) an adhesive strip (70) is applied to one side of the flat web (50), h) the web (50) is folded together to form side gussets (72, 74) in such a way that the free leg (66) of the folded slip (64) is arranged on the format gluing (68), i) the reactivatable adhesive strips (52; 54, 56) are activated, j) folding edges (76, 78, 80) are pre-grooved. Sack or bag according to claim 3, characterized in that it is made from a single material, preferably paper. Process and production of a sack or bag with a rectangular bottom when filled and with a handle part consisting of the following steps: a) a strip (112) of reactivable adhesive or sealing wax running perpendicular to the side edges is applied to one side of a continuously moving flat web (110) at a spacing of one bag length, this strip being followed by triangular surfaces (114 ) having, b) at the appropriate point, two flat strips (116, 118) made of reactivable adhesive or sealing wax are applied to the back of the flat web (110), c) below the strip (112), in the area of a later side wall between two triangular projections (114), a folded note (128) with one leg is glued, while the other leg (130) is folded back onto this d) below the strip (112), on the opposite side wall, a surface (132) is size-glued, which corresponds to the leg (130), e) an adhesive strip (134) is applied to one side of the flat web (110), f) the web (110) is folded into a tube to form side folds (136, 138) in such a way that the free leg (130) is arranged on the format glue (132), g) the reactivatable adhesive strips or sealing wax strips (112, 116) are activated, h) folding edges (140, 142, 144, 146) are pre-grooved, i) a grip hole (145) is punched in. A process for producing a sack or bag according to claim 5, characterized in that

that in the strip (112) made of reactivatable adhesive or sealing wax two areas are left open when the strip (112) is applied, onto which reinforcements (124, 126) are glued over the entire surface, the non-glued side of which is preferably also coated with reactivatable adhesive or sealing wax. Sack or bag according to claim 1, characterized in that it is made from a single material, preferably paper. Process for producing a sack or bag with a rectangular bottom when filled and with a handle part comprising the following steps: a) a strip (52) of reactivable adhesive or sealing wax, which runs perpendicular to the side edges, is applied to one side of a continuously advanced flat web (50) at a distance from one bag length and has two attached triangular surfaces (153 ) also made of reactivable adhesive or sealing wax, b) at the appropriate point, two short strips (154, 156) of reactivable adhesive or sealing wax are applied to the back of the flat web (150), c) in the running direction of the flat web (150) in front of the strip (152) and parallel to it, two cuts (158, 160) are provided at a distance from one another, d) in the area of at least one of the incisions (158), at least one grip part (162) is glued onto the flat web (150) in such a way that it projects beyond the strip (152) and the incision (158), e) a folded piece of paper (164) is stuck on with one leg in such a way that it rests on the free glued ends of the handle (162), while the other leg (166) is folded back onto it, f) below the second incision (160), a surface (168) is size-glued, which corresponds to the leg (166) of the folded note (164), g) an adhesive strip (170) is applied to one side of the flat web (150), h) the web (150) is folded together to form side folds (172, 174) in such a way that the free leg (166) of the folded slip (164) is arranged on the format glue (168), i) the reactivatable adhesive strips (152; 154, 156) are reactivated, j) folding edges (76, 78, 80) are pre-grooved. Sack or bag according to claim 8, characterized in that it is made from a single material, preferably paper.

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