EP2145754A1 - Packaging bag - Google Patents

Abstract

The method involves locking an opening (7) of a head section (6) of the packaging bag by a closing element (8). Two side folds (3,4), a front wall (1) and a rear wall (2) of the bag are equally long and are connected with each other. The front wall or the rear wall is folded in the head section by the surface of the front wall and rear wall. A welding process is performed which partially interconnects the front wall and the rear wall in the head section.

Description

Technical field of erection

The present invention relates to a method for producing a packaging bag, in particular a folding bag, according to the features of the preamble of claim 1 and a packaging bag according to claim 10.

State of the art

Packaging bags, in particular folded bags and gusseted bags, and manufacturing methods for such bags are known from the prior art.

Such gusseted bags typically include a front wall, a back wall, a right gusset, a left gusset, a bottom, and a bottom opposed opening which is closed by a closure member. Through the opening of the bag can be filled and the contents can be removed by a user through the opening of the bag. An arranged in the region of the opening closure element closes the bag. This closure element can be designed, for example, as a resealable closure element. The side walls connect the front wall and the rear wall, usually by means of a welded connection.

Typically, such bags are made of a polyethylene or polypropylene film (PE, PP). Such films are weldable or sealable on one side and printed on the other side and not least not weldable. The printed side lies outside so that the user of a bag can see the packaging information from the printed page. The weldable surface is therefore facing the interior. This property of the film poses some problems in the manufacture of a bag, since the individual elements must be arranged in such a way that there are always two weldable surfaces facing each other, so that a corresponding connection can be made. For example, it is difficult To make the bag close to the opening satisfactorily and efficiently.

For example, it is known from the prior art that parts of the gussets are folded outwards in the region of the opening so that they are no longer covered by the front wall or the rear wall. The parts are then cut away and the front wall is welded to the back wall in this area. The folding process can be made by machine, but is complex and uncertain.

A disadvantage of the bags of the prior art is the fact that they can open up in the region of the opening during the filling and / or removal of the bag contents, whereby, for example, solves the connection of the two gussets in this area. This is due to the fact that the joints in this region of the opening are poorly formed with respect to this mechanical action. As a result, the function of the resealable closure element is impaired, since in the region of the opening the front wall and the rear wall are too far away and therefore the closure element can burst open. A defined and secure closure is then no longer possible.

Presentation of the invention

Based on this prior art, the invention has for its object to provide a method and a bag, which overcomes the disadvantages of the prior art. In particular, a bag is to be made, which may be formed in the region of the opening in such a way that unfolding is no longer possible, wherein in addition the cross section of the opening should not be impaired.

This object is achieved by methods having the features of claim 1. Accordingly, a method for producing a packaging bag from a single-side weldable multilayer film is provided, the packaging bag having a front wall, a rear wall, a right side fold, a left side fold, a bottom and a bottom opposite Head section with an opening which is closable by a closure element comprises. The two gussets, the front wall and the rear wall are substantially the same length and welded together, so that the gussets except in the head section over its entire length with the front wall and the Rear wall are connected. The weldable surface is directed against the interior of the packaging bag. According to the method, the front wall and / or the rear wall in the head section are folded away from the surface of the respective wall. Subsequently, cutting areas of the gussets are removed. After removing the cutting areas, the respective wall is pivoted back to the original position and a welding process is carried out, which partially connects the front wall and the rear wall in the head section. In particular, the front wall is connected to the rear wall in the region of the cutting area.

By the connection of the front wall with the rear wall in the region of the cutting areas in the head portion, a connection is created, which prevents a gaping between the front wall and the rear wall.

Preferably, the cut region extends from one end along the outer edge of the respective gusset towards the gusset.

Preferably, the length of the cut area in the direction of the side fold is greater than the width of the cut area in the direction which is transverse to the direction of the side fold.

Preferably, a closure element is placed before the welding process, which is welded to the rear wall and the side fold.

Preferably, the weld joint between the front wall and the rear wall in the region of the cutting area is formed directly and is indirectly formed in the remaining areas on the respective side fold or the closure element. The direct connection in the region of the cutting area has the advantage that the front wall and the rear wall are connected to each other without additional elements, which is why a particularly good and mechanically strong connection, which prevents the unfolding, is provided.

Preferably, the cut area extends transversely or at an angle to the direction of the respective gusset and extends over the entire width of the respective gusset, so that the Gusset is shortened in length and so that a cut edge is formed.

Preferably, after the cutting operation, a wrapping element is connected to the gusset, the wrapping element surrounding the cut edge of the cut area, and the wrapping element being welded to the gusset top on the gusseted top and gusseted underside. By arranging a wrapping element, a connection fixed with respect to the unfolding can be provided, in addition the wrapping element has the advantage of an improved sealing of the interior space.

Preferably, the welding connection between the front wall and the rear wall is formed indirectly via the respective side fold or the closure element or the wrapping element and / or directly in the region of an intermediate space.

Advantageous embodiments of the method are specified in the dependent claims.

A packaging bag made of a single-side weldable multilayer film comprises a front wall, a rear wall, a right side fold, a left side fold, a bottom and a head portion opposite the bottom with an opening which can be closed by a closure element. The two gussets the front wall and the rear wall are substantially equal in length and welded together, so that the gussets are connected except in the head section over its entire length with the front wall and the rear wall. The weldable surface is directed against the interior of the packaging bag. The gussets have cut areas. The front wall and the rear wall are welded together in the area of the cutting areas.

Advantageous embodiments of the device are specified in the dependent claims.

Short description of the drawing

Fig. 1

eine Draufsicht eines befüllten Beutels nach einer ersten Ausführungsform gemäss der vorliegenden Erfindung;

Fig. 2

einen Querschnitt durch den Beutel nach Figur 1 entlang der Schnittlinie A-A;

Fig. 3 bis 8

einen nicht befüllten Beutel nach Figur 1 bei verschiedenen Verfahrensschritten seiner Herstellung;

Fig. 9

einen Ausschnitt des Beutels nach Figur 1;

Fig. 10 bis 14

einen nicht befüllten Beutel nach einem zweiten Ausführungsbeispiel bei verschiedenen Verfahrensschritten seiner Herstellung;

Fig. 15

einen Ausschnitt eines befüllten Beutels nach Fig. 10.

Preferred embodiments will be described in more detail below with reference to the drawing by way of example. Show it:

Fig. 1

a plan view of a filled bag according to a first embodiment according to the present invention;

Fig. 2

a cross section through the bag after FIG. 1 along the section line AA;

Fig. 3 to 8

an unfilled bag after FIG. 1 at various process steps of its production;

Fig. 9

a section of the bag after FIG. 1 ;

10 to 14

an unfilled bag according to a second embodiment in various process steps of its manufacture;

Fig. 15

a section of a filled bag after Fig. 10 ,

Description of preferred embodiments

With reference to the drawings, possible embodiments will be described. The drawings and the description illustrate preferred embodiments and should not be construed to limit the invention which is defined by the claims.

Based on FIG. 1 showing a filled bag according to the present invention, the structural configuration of the bag will now be explained. The bag comprises a front wall 1, a back wall 2, a right gusset 3, a left gusset 4, a bottom 5 and a head portion 6 opposite the bottom 5 with an opening 7. As viewed from the opening 7, the left gusset 4 connects the front wall 1 with the rear wall 2 on the left side and the right side fold connects the front wall 1 with the rear wall 2 on the right side. The gussets 3, 4 are connected via welded connections to the front wall 1 and the rear wall 2.

The front wall 1, the rear wall 2, the two side folds 3, 4 and the bottom 5 limit the interior of the bag. Via the opening 7, the interior of the bag can be filled with the corresponding filling and the filling can be removed via the opening 7 in turn from the bag. In the region of the opening 7, a closure element 8 is also arranged. The closure element 8 is preferably a reclosable closure element and may additionally comprise a guarantee element. Here is a closure element 8 with a zipper or slider 15 is shown.

FIG. 2 shows the cross section of a bag. Seen in cross section, the gussets 3, 4 are V-shaped. Accordingly, the side folds 3, 4 extend from the junction with the front wall 1 in a first section 3a, 4a in the interior of the bag 1. In the interior, the side fold 3, 4 is deflected and extends as a second section 3b, 4b against the connection point with the rear wall 2 from the interior to the outside. The surface of the respective first section 3 a, 4 a, which extends in the direction of the interior and can be welded, can also be referred to as side gusset top 11. The surface of the respective second section 3b, 4b, which extends in the direction of the interior and can be welded, may also be referred to as gusseted underside 12. Alternatively, the gussets 3, 4 may also be C-shaped or bellows-shaped with a plurality of folds. It is important that at least one fold is present, which protrudes into the interior of the bag, so that the bag from a flat state in which the front wall 1 and the rear wall 2 almost touch, go into an expanded state.

With the help of the schematic cross-section of FIG. 2 the weldability of the bag is explained. The bag is made of a film whose one surface can be welded and whose other surface is printed and not weldable. The weldable surface bears the reference symbol S and the printed surface the reference symbol B. In the case of a welding of two film parts, the parts can be welded together via the respective weldable surfaces. In the bag described herein, the front wall 1, the rear wall 2 and the two side folds 3, 4 are arranged such that the weldable surface S is directed against the inner space. Accordingly, the printed surface B is directed to the outside. From the FIG. 2 In addition, the welding points 17 can be seen, which connect the side folds 3, 4 with the walls 1, 2. For example, a polyethylene film can be used. Such a film may comprise a plurality of layers, such as a carrier layer (eg of PET or PA), which is connected on one side with a weldable polyethylene film. Alternatively, a polypropylene film can be used as a weldable film. The weldable surface can also be called a seal surface.

Since only one surface of the film is weldable, two weldable surfaces must be opposite each other. A welding tool heats the area covered by it. After a certain exposure time, the weldable surfaces S in this area change to a semi-liquid or liquid state, the two surfaces being joined together.

The bottom 5 can be designed in various ways. Corresponding embodiments are known in the art.

Seen in the direction of the gussets 3, 4, the bag is divided into different sections. A bag section 13 essentially forms the interior. In this section, the front wall 1 and the rear wall 2 are substantially parallel to each other.

A transition section 14, which adjoins the bag section 13, forms the transition to the opening 7 or to the head section 6. In this transition section 14, the front wall 1 and the rear wall 2 extend at an angle to each other when the interior is filled, so that the distance between the two walls 1 , 2 continuously reduced to the opening 7 down. In this case, the distance between the two walls 1, 2 decreases to the effect that the two walls 1, 2 against the end of the transition portion 14 are at a distance from each other, which substantially corresponds to the thickness of the closure element 8.

The transition section 14 adjoins the head section 6, in which the front wall 1 and the rear wall 2 in turn extend substantially parallel to each other. Between the walls 1, 2 is the closure element 8 and parts of the gussets 3, 4 as will be described below. The arrangement and formation of a head portion 6, as will be further explained below, prevents the bag from opening. A gaping of the bag is understood to mean, in particular, the separation of the front wall 1 from the rear wall 2 in the region of the transition from the transition section 14 to the head section 6, as well as in the head section 6. This area is denoted by the reference numeral 16 (see FIG. 1 ) Mistake. Such opening up is disadvantageous since the closure element then easily burst inadvertently and leak out the contents of the bag can. This is especially true when the entire head section 6 opens, that is, when the front wall 1 no longer runs parallel to the rear wall 2 in the region of the closure element 8.

Based on FIGS. 3 to 8 Now, a manufacturing method for producing a bag after FIG. 1 explained. In this case, all figures show an unfilled bag, wherein the front wall 1 rests substantially on the rear wall 2.

The bags are prepared so that the left gusset 3 and the right gusset 4 are already connected to the walls 1, 2 via the joint weld 17 and lie flat therebetween. Optionally, the floor 5 may also already be prepared. Seen in the direction of the gussets 3, 4, the gussets 3, 4 have an equal length, as the walls 1, 2. The connecting welds 17 between the gussets 3, 4 and the walls 1, 2 extend over the entire length of the The connecting weld seams 17 are shorter than the side folds 3, 4. This means that in the transition section 14 and in the head section 6, the side folds 3, 4 are not connected to the walls 1, 2.

Optionally, however, an auxiliary welding seam 18 may be provided, which connects the front wall 1 and the rear wall 2 to one another in a reference region 19, which is illustrated by dashed lines. The auxiliary weld seam 18 may also be formed as a point, which is arranged in the corners of the reference region 19. This reference region 19 is separated in a first optional method step by a device, so that a reference edge 20 is available, to which the further method steps can be aligned. The reference edge 20 then forms the end of the head section 6.

After the optional step of removing the reference region 19, the front wall 1 as well as the rear wall 2 are pivoted angularly relative to their respective surface. The upwardly pivoted parts of the walls 1, 2 may also be referred to as Verschwenkabschnitte 22. This is in the FIG. 3 shown. The axis 21 about which the pivoting movement is performed is preferably a line in the axis Area at which the bag section 13 and the transition section 14 meet. Due to the pivoting process are parts of the side walls 3, 4, which can be referred to as free ends 23, 24, free-standing, that is not covered by the side walls 3, 4. In other words, it can also be said that the free ends 23, 24 protrude from the interior of the bag.

Like in the FIG. 5 As shown, the free ends 23, 24 can be machined. In this embodiment, each free end 23, 24 is separated in each case a cutting region 9. The cutting region 9 is shown here in dashed lines and extends along the direction X, in which the corresponding gusset 3, 4 extends, from the end face 25 of the gusset 3, 4 in the free end 23, 24 in and is in the transverse direction at the outer edge 35 arranged. As the outer edge 35, the edge is referred to here, which does not face the interior. The section region 9 extends both through the first section 3a, 4a and through the second section 3b, 4b of the lateral folds 3, 4. Preferably, the length of the cutting region in the direction X is greater than the width in the corresponding transverse direction Y. In the rear Area, which is the end face 25 opposite, the cutting area 9 is preferably rounded.

In a subsequent step, the rear wall 2 is folded down again, so that the corresponding pivoting section 22 parallel to the free ends 23, 24 extend.

In a subsequent step, the closure element 8 is now supplied. This will be in FIG. 6 shown. The closure element 8 has a length which is preferably shorter than the width of the bag. This means that the closure element 8 extends only partially over the bag width. Particularly preferably, the length of the closure element 8 is selected such that it does not project or only partially into the cut regions 9. Like in the FIG. 5 shown, the closure element 8 is located on the inside of the rear wall 2 and on the inside of the respective gussets 3, 4. As mentioned above, the interior facing surfaces are weldable. The welding at this point follows two stages. In a first stage ( FIG. 6 ) is followed by a Erstschweissung 26. Here, the closure element 8 are connected to the respective side gussets 3, 4 and the gussets 3, 4 are connected to the rear wall 2. In a second stage ( FIG. 7 ), the closure element 8 is provided with a closure seal 27 which extends over the entire width of the bag or the closure element 8 extends, welded to the rear wall 2 of the bag. The two-stage approach increases the safety of the welded connection, in particular the connection between the gussets 3, 4 and the rear wall 2. By this welding connection, the gussets 3, 4 and the closure element 8 are securely and tightly connected to the rear wall 2. Furthermore, the closure element 8 the first sections 3a, 4a of the gussets 3, 4 securely and tightly connected.

Once the closure member 8 has been welded, the pivoting portion 22 of the front wall 1 can also be pivoted against the free ends 23, 24. After the swivel process follows another welding process, which in the FIG. 8 is shown. Here, the welding tool extends from the head section 6 via the transition section 14 to partially into the bag section 13 and applies a lateral closure weld 31. By welding, the weldable surface of the front wall 1 is welded together with the weldable surface of the rear wall 2 at the cutting areas 9. This will be in FIG. 8 and 9 , which shows a section of a head region, as a hatched area 28, which may also be referred to as a closure weld 28 shown. By the welding of the weldable surface of the front wall 1 with the weldable surface of the rear wall 2 in this head portion 6 prevents the bag can open in this area.

In addition, the weldable surface of the corresponding gussets 3, 4 is connected to the front 1 and the back 2. This is in the FIG. 9 represented by the hatched closure portion 33. Due to the fact that the printed area B is not weldable, the gussets 3, 4 are not welded together on the outside despite heat, so the gussets 3, 4 can be unfolded during the filling process.

At this time, there is still no connection between the front wall 1 and the closure element 8, that is between the front wall 1 and the closure element 8 exists a filling opening 29 through which the contents can be filled into the bag. Otherwise, all other places in the head area are welded accordingly. After filling, the front wall 1 can be welded to the closure element 8.

In a further optional method step before filling, the edge 30 in the area of the head section can also be processed with a punching tool. The punch removes a fine strip from the bag in this area so that residues originating from the weld and having escaped from the weld can be cut away. Thus, a visually appealing bag can be created.

In the FIG. 9 The welding situation will be shown again. It can be seen that the weld seam 17 merges into the closure region 33. The closure region 33 merges into the closure weld 28, which in turn merges into the closure weld 27.

The FIGS. 10 to 14 show another method for producing a bag. The outer structure of the bag is similar to the structure of the previously explained bag, which is why at this point on the FIG. 1 and 2 and whose explanations are referenced. Identical parts are provided with the same reference numerals.

In the FIG. 10 a first step of the manufacturing process is shown. In this case, pivot areas 22 of the front wall 1 and the rear wall 2 are in turn pivoted about a pivot axis 21.

In a further step, in each case a section region 9 is removed from the corresponding side fold 3, 4. The cutting area 9 here has the shape of a rectangle, wherein the cutting edge 32 extends substantially perpendicular to the direction of the gussets 3, 4. In other words, it can also be said that the gussets 3, 4 are shortened.

Alternatively, the cutting edge 32 could also extend at an angle to the direction of the gussets 3, 4. For example, it is conceivable that the angle is arranged such that the length of the respective free end increases in the direction of the bag center. This is indicated by the dashed line 32 '.

After the cutting area 9 has been removed, the bag, as shown in the FIGS. 11 and 11a is shown, a wrapping element 10 is supplied. The wrapping element 10 is designed such that it envelops the respective lateral folds 3, 4. That is, the wrapping member is in contact with the weldable surface S of the gussets 3, 4, that is, with the gusseted top 11 and gusseted bottom 12. The weldable surface S is due to the folding of the side gussets 3, 4 directed both against the front wall 1 and against the rear wall 2. In other words, it can also be said that the wrapping element 10 encloses the front parts of the free ends 23, 24 in the region of the end face. The wrapping element 10 is then connected to the corresponding surface of the gussets 3, 4 by welding. It is important that the wrapping element 10 is arranged such that it extends over the entire length of the cut edge 32 and completely envelops the latter. The wrapping element 10 is formed for example of polyethylene or polypropylene and both sides weldable or sealable. For example, the wrapping element 10 may be multi-layered and comprise a carrier layer. It is important that the wrapping element is made of the same material as the weldable surface of the front wall 1 or the rear wall 2, so that a good and permanent connection between the wrapping element and front wall 1 or rear wall 2, as described herein, can arise.

The wrapping element 10 in this embodiment has the same width as the free ends 23, 24 of the gussets 3, 4. In an alternative embodiment, only one wrapping element 10 could be provided which extends from the free end 23 over the entire bag width to the free end 24 extends. It is only important that the free ends 23, 24 of the gussets 3, 4 must be completely enveloped by the respective wrapping element 10.

By attaching a wrapping element 10, the part of the side fold 3, 4, which is directed against the front wall 1, with the part of the side fold 3, 4, which is directed against the rear wall 2, connected.

In the FIG. 12 it is shown that now in the further steps, the pivoting portion 22 of the rear wall 2 is pivoted back to the original position. Furthermore, the closure element 8 is now placed and with an optional Erstschweissung 26th connected to the back wall. The closure element 8 is arranged such that between the closure element 8 and the wrapping element 10, a gap 36 is present.

Then, as in FIG. 13 the closure weld 27, which extends over the entire width produced.

In a next step, as in the FIG. 14 is shown, the pivoting portion 22 of the front wall 1 swung back to the original position. This is followed by another weld. Here, the welding tool extends from the head section 6 via the transition section 14 to partially into the bag section 13 and applies a lateral closure weld 34. By welding 34, the front wall 1 is partially welded indirectly and partially directly to the rear wall 2. Partly indirectly, because the front wall 1 is connected to the gussets 3, 4, the wrapping element 10 and the closure element 8, and because the back wall 2 is connected to the same elements on the other side. In the region of the intermediate space 36, the front wall 1 is connected directly to the rear wall 2. The direct connection ensures a particularly high level of security against uncovering.

In an alternative embodiment, in which the closure element 8 directly adjoins the wrapping element 10, the welded connection takes place indirectly, which also provides security against unfolding.

In the FIG. 12 For example, the area over which the side closure weld 34 extends is shown in phantom on the left side. By this welding can be prevented that the bag gapes in the front area. This means that the front wall 1 and the rear wall 2 always remain parallel to each other when the bag is closed, which prevents unintentional bursting of the closure element.

As already mentioned in connection with the first embodiment, there is still no connection between the front wall 1 and the closure element 8, that is, between the front wall 1 and the closure element 8 exists a filling opening 29 through which the contents can be filled into the bag. Otherwise are welded all open areas of the bag accordingly.

In the FIG. 14 The welding situation will be shown again. It can be seen that the weld 17 merges in the region of the covering element 10 into the closure weld 34, which in turn merges into the closure weld 27.

As mentioned above, here too, the edge 30 can be serged by a further punching operation.

LIST OF REFERENCE NUMBERS

1

front wall

2

rear wall

3

right gusset

4

left gusset

5

ground

6

header

7

opening

8th

closure element

9

cutting areas

10

armoring member

11

Gusseted top

12

Gusseted bottom

13

bag portion

14

Transition section

15

pusher

16

Aufklaffbereich

17

Weld

18

Auxiliary weld

19

reference range

20

reference edge

21

swivel axis

22

Verschwenkabschnitte

23

free end

35 24

free end

25

front

26

Hilfsschweissung

27

Verschlussschweissung

28

Verschlussschweissung

40 29

filling opening

30

edge

31

lateral closure welding

32

cutting edge

45 33

closure area

34

Verschlussschweissung

35

outer edge

36

gap

Claims (15)

Method for producing a packaging bag from a single-sided weldable multilayer film, the packaging bag having a front wall (1), a rear wall (2), a right side fold (3), a left side fold (4), a bottom (5) and a bottom (5) 5) opposite the head portion (6) having an opening (7) which is closable by a closure element (8) comprises, wherein the two side folds (3, 4), the front wall (1) and the rear wall (2) substantially equal are long and welded together, so that the gussets (3, 4) except in the head portion over its entire length with the front wall (1) and the rear wall (2) are connected, the weldable surface is directed against the interior of the packaging bag, characterized in that the front wall (1) and / or the rear wall (2) in the head portion (7) are seen from the surface of the respective wall (1, 2) folded away, that then cut areas (9) of the side folds (3, 4) are removed, and that after removing the cutting portions (9), the respective wall (1, 2) is pivoted back to the original position, and that a welding operation is carried out, which the front wall (1) and the rear wall (2) in the head portion (6) partially interconnected. A method according to claim 1, characterized in that the cutting region (9) extends from an end face (25) along the outer edge (35) of the respective gussets (3, 4) in the direction of the gussets (3, 4), preferably the Length of the cutting area (9) in the direction of the gusset (3, 4) is greater than the width of the cutting area (9) in the direction (Y) which is transverse to the direction of the gusset (3, 4). Method according to one of the preceding claims, characterized in that before the welding process, a closure element (8) is placed, which is welded to the rear wall (2) and the side fold (3, 4), wherein the closure element (8) preferably has a length , which is smaller than the width of the bag, and wherein the closure element (8) is preferably arranged centrally to the width. Method according to one of the preceding claims, characterized in that the welding connection between the front wall (1) and the rear wall (2) in the region of the cutting area (9) is formed directly and in the remaining areas on the respective gussets (3, 4) and The closure element (8) is formed indirectly. A method according to claim 1, characterized in that the cutting region (9) extends transversely or at an angle to the direction (X) of the respective lateral fold (3, 4) and extends over the entire width of the respective lateral fold (3, 4), so that the Side fold (3, 4) is shortened in length and so that a cutting edge (32) is formed. A method according to claim 5, characterized in that after the cutting operation, a wrapping element (10) is connected to the lateral fold (3, 4), wherein the wrapping element (10) surrounds the cut edge (32) of the cutting area (9) and wherein the wrapping element (10) 10) on the gusseted top (11) and on the gusseted underside (12) is welded to the gusset (3, 4). Method according to one of the preceding claims, characterized in that the welded connection between the front wall (1) and the rear wall (2) indirectly via the respective side fold (3, 4) or the closure element (8) or the wrapping element (10) and / or directly in the region of a gap (36) is formed. Method according to one of the preceding claims, characterized in that after the welding operations parts in the region of the cutting areas (9) are cut away, so that the edges of the bag are removed in these areas of residues from the welding process. Method according to one of the preceding claims, characterized in that before removing the cutting areas, a reference area (19) is separated, so that a reference edge (20) is provided, wherein the reference area (19) the area of the opening (7) or the head section (6) adjoins. Packaging bag made of a single-side weldable multilayer film, wherein the packaging bag has a front wall (1), a rear wall (2), a right side fold (3), a left side fold (4), a bottom (5) and a bottom section (5) opposite the head section (6) with an opening (7 ), which is closable by a closure element (8), wherein the two lateral folds (3, 4) are substantially equal in length to the front wall (1) and the rear wall (2) and are welded together so that the gussets (3 4) are connected to the front wall (1) and the rear wall (2) over their entire length, except in the head section, the weldable surface being directed towards the interior of the packaging bag, characterized in that the side folds (3, 4) are sectional areas (3, 4). 9), wherein the front wall (1) and the rear wall (2) are welded together in the region of the cutting areas. Packaging bag according to claim 10, characterized in that the cutting region (9) extends from an end face (25) along the outer edge (35) of the respective lateral fold (3, 4) in the direction of the lateral fold (3, 4). Packaging bag according to claim 10 or 11, characterized in that the closure element (8) with the rear wall (2) and the side folds (3, 4) is welded. Packaging bag according to one of claims 10 to 12, characterized in that in the region of the cutting region (9), the front wall (1) is welded directly to the rear wall (2), and that in the remaining areas, the front wall (1) with the rear wall ( 2) is welded indirectly via the respective lateral fold (3, 4) or the closure element (8). Packaging bag according to claim 10, characterized in that the cutting region (9) extends transversely or at an angle to the direction (X) of the respective lateral fold (3, 4) and extends over the entire width of the respective lateral fold (3, 4), so that the Side fold (3, 4) is shortened in length and so that a cut edge (32) is formed and / or that the side fold (3, 4) is connected to a wrapping element (10), wherein the wrapping element (10), the cutting edge ( 32) of the cutting area (9), and wherein the wrapping element (10) on the gusset top (11) and on the gusseted underside (12) is welded to the gusset (3, 4). Packaging bag according to claim 14, characterized in that the front wall (1) and the rear wall (2) indirectly via the respective side fold (3, 4) or the closure element (8) or the wrapping element (10) and / or directly in the area a gap (36) are connected.

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