EP2049327A1

EP2049327A1 - Method for the production of packaging bags having a reinforced base region and device for carrying out the method

Info

Publication number: EP2049327A1
Application number: EP07763957A
Authority: EP
Inventors: Tiziano Colla
Original assignee: Water-Line SA; Water Line SA
Current assignee: Water-Line SA; Water Line SA
Priority date: 2006-07-27
Filing date: 2007-07-20
Publication date: 2009-04-22
Also published as: US20100022375A1; WO2008011740A1

Abstract

In a method for the production of packaging bags (30) made of plastic film a section of the packaging bag disposed on one end of the packaging bag (30) is folded upwards along a laterally extending folding line (22) as the folding section (21), and glued to the packaging bag (30). Before it is folded, an adhesive is applied to at least one of the two surfaces to be glued. A hot glue is used as the adhesive. According to the invention, the adhesive is applied approximately simultaneously in the form of a plurality of adhesive sections (25,..,29, 125).

Description

DESCRIPTION

METHOD FOR MANUFACTURING PACKAGING BAGS

REINFORCED SOIL AREA AND DEVICE FOR IMPLEMENTING THE PROCESS

TECHNICAL AREA

The present invention relates to the field of production of packaging bags. It relates to a method for producing packaging bags, in particular with reinforced bottom area, as well as a device for carrying out the method.

STATE OF THE ART

For the packaging of animal feed or the like, high-quality, stable packaging bags made of plastic film material are used today. As a film material is both single-layered and multilayer material is used in which, for example, films made of different plastics can be combined with intermediate aluminum foil. In the Production, first, a film tube is formed, which is usually provided with gussets. In the film tube transverse welds are introduced at regular intervals, which form the bottom of the subsequent packaging bag.

When filling the bags with contents and during later transport and use of the filled bags there is a risk that the welds will not withstand the load and rise. This is particularly a problem when the packaging bags are intended for larger containers with contents of 1, 5 kg, 2 kg or more.

It has therefore been increasingly begun to provide the packaging bag with a bottom reinforcement, which is produced by folding over a bottom portion and gluing the folded bottom portion with the bag. The folded bottom portion may also be provided with a print for promotional or informational purposes, which can be read in a lying bag. Such a packaging bag with bottom reinforcement is shown in simplified form in FIGS. 6 and 7. The packaging bag 30 has a front side 34 and a back side 35, as well as gussets 36 and 37. In the bottom region 32, a folding section 21 is folded back along a fold line 22 and glued to the back 35 of the packaging bag 30. At the top in Fig. 6, a filling opening 31 can be seen, through which the bag can be filled or emptied. For the closure of the filling opening 31 different measures can be taken. In particular, the opening can be reclosed, e.g. be formed by means of a so-called zipper.

For gluing the folding portion 21, an adhesive application 33 of a hot melt or hot melt adhesive is usually used, which is applied to the back 35 of the packaging bag 30 parallel to the fold line 22, ie across the bag, and over the entire width of the packaging bag 30. The spiral adhesive application 33 is produced with a fine adhesive nozzle, which is guided in a circular movement across the entire width of the bag. is the adhesive application 33 completed, the folding section 21 is folded over and pressed onto the adhesive application 33.

However, the described type of soil reinforcement or the adhesive application has disadvantages that are particularly in the lack of durability of the bond or the lack of mechanical strength are sought: The hot melt used in direct order from the (heated) adhesive nozzle on the outer plastic film on the Back 35 of the packaging bag 30 to an intimate connection with the film, so that with respect to this connection few problems. However, the situation is different in the connection between the adhesive application 33 and the inside of the folded folding section 21. The application of the adhesive to the packaging bag takes a comparatively long period of time, because the application of adhesive extends over the entire width of the bag. As a result, the already applied adhesive cools down before the adhesive application is completed. Further, an outer skin is formed on the surface of the adhesive, which has a lowered adhesiveness. Especially with large bags, the pot life (service life) of the adhesive is often exceeded due to the long time when applying the adhesive. Experiments have shown that the folding section 21 can be detached from the packaging bag by hand without much effort. It was also found that the adhesive adhered only on the side to which it was applied. It then comes to a bond between the adhesive layer 33 and the film of the folding portion 21, which is more similar to a pressure-sensitive adhesive and runs without intimate connection between the adhesive and the film.

The folding section 21 can then be subjected to increased load - e.g. during filling, or when its slightly protruding outer edge catches behind a projection - thus loosening the intended effect of the soil reinforcement.

From FR 969.987 a paper bag is known, which is formed substantially as a folded bag with taped seams. The bottom area of the Paper bag can be folded over, wherein the fold can be bonded to the surface of the paper bag. The disadvantage is that the paper bag is weakened by the same in the area of the adhesive application. In particular, the paper bag can tear in the area of the adhesive application.

PRESENTATION OF THE INVENTION

It is therefore an object of the invention to provide a method for producing a packaging bag, in particular with (bonded) bottom reinforcement, which avoids the disadvantages of known methods and results in a simple way to a soil reinforcement with high load capacity. Furthermore, an apparatus for carrying out the method should be specified. In particular, a method or a device is to be specified which accelerates the process of producing a soil reinforcement. In particular, the time between the beginning of the adhesive application and the folding of the folding section should be reduced.

The object is solved by the features of claims 1, 19, 30 and 31, respectively.

Accordingly, there is provided a method for manufacturing plastic film pouches, which method includes one at one end of the pouch

Packing bag arranged portion of the packaging bag as

Folded section along a transverse fold line is folded upwards and glued to the packaging bag. Before refolding, an adhesive is applied to at least one of the two surfaces to be bonded. The adhesive used is a hot-melt adhesive. According to the invention, the adhesive is applied approximately simultaneously in the form of a plurality of adhesive sections.

The essence of the invention is to make the adhesive application, in particular using multiple distributed adhesive nozzles so that the time for the adhesive application can be reduced. Thus, the bonding can be done very quickly after application of the adhesive and the applied adhesive can intimately connect with both surfaces to be bonded. Thereby Bonding is achieved with high mechanical strength, because the adhesive adheres to both surfaces to be bonded due to the short time between application and bonding with both surfaces.

Preferably, the adhesive portions are spaced from each other. This is advantageous because it allows the adhesive to be applied in a short time. Alternatively, the adhesive portions may be disposed adjacent to each other or overlapping.

A durable and durable bonding is achieved in that the application of the adhesive and the subsequent folding of the folding portion is carried out so that the adhesive substantially over the entire length of the adhesive application, ie the adhesive portion, connects to the two surfaces to be bonded.

In particular, the adhesive is applied in the form of a plurality of individual, distributed over the width of the packaging bag, arranged short sections, wherein preferably each of the adhesive portions or portions of the adhesive application is assigned its own adhesive nozzle.

According to a development, the sections or adhesive sections have the form of adhesive beads, wherein for applying the adhesive beads of the packaging bag and / or the adhesive nozzles are moved.

In particular, the adhesive beads may preferably extend approximately or exactly transversely to the bag longitudinal direction. But you can also run obliquely to the bag longitudinal direction.

But it is also conceivable that the adhesive beads run in the bag longitudinal direction.

The adhesive beads can also cross the fold line. According to another development, the sections have the form of glue dots.

Another embodiment of the method according to the invention is characterized in that the adhesive is applied to both surfaces to be bonded in such a way that adhesive deposits of both surfaces come to rest on one another during folding, in particular congruently. As a result, a particularly good adhesive bond is obtained.

It is particularly advantageous if, immediately after the adhesive application has been completed, the folding section is folded over and pressed onto the packaging bag, the adhesive application and the subsequent folding and pressing of the folding section preferably taking place in a time interval of a few tenths of a second.

Another embodiment of the method according to the invention is characterized in that the individual packaging bags are cut off from a continuous tubular film web, which is transversely welded upstream of the subsequent separation points, and the free end of the film web is first transported into the position intended for the adhesive application and is held there, that then the packaging bag is separated from the film web, and that applied immediately after the separation of the adhesive and the folding section is folded over.

A further development is characterized in that the free end of the film web rests in the position provided for the adhesive application with the underside on a holding device and is held there by means of negative pressure, freeing the free end of the film web in the position intended for the adhesive application with the folding section projects beyond the holding device, and that the freely projecting folding section is folded over the entire width along the fold line by means of a pivotable folding device. In an embodiment of the device according to the invention for carrying out the method, an adhesive device and a folding device, in particular a floor treatment unit, are arranged one behind the other in the transport direction along a transport plane. The folding device is for folding over a folding portion of the packaging bag to be produced, and immediately before the folding device, the adhesive device is provided with a plurality of distributed adhesive nozzles. The adhesive nozzles are designed for approximately simultaneous application of a hot-melt adhesive for a plurality of adhesive sections.

An embodiment of the device according to the invention is characterized in that within the soil treatment unit in the region of the adhesive nozzles a negative pressure holding device is provided which sucks the film web lying on it during processing and holds, and that above the holding device holding-down are arranged, which hold down the film web at the edges on the holding device.

Another embodiment of the device according to the invention is characterized in that the distance between the cutting unit and the processing unit in the transport direction is adjustable, and that between the two units a length-adjustable, first belt-shaped transport device is arranged.

Another embodiment of the device according to the invention is characterized in that behind the processing unit, a second belt-shaped transport device is provided with two parallel belts, between which the finished packaging bags are transported compressed. A further embodiment of the device according to the invention is characterized in that the folding device comprises a pivotable beam arranged transversely to the transport direction.

The adhesive nozzles can be mounted stationary in the inventive device above the transport plane; But they can also be mounted movable above the transport plane in the transverse direction.

BRIEF EXPLANATION OF THE FIGURES The invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the drawing. Show it

Fig. 1 in several sub-figures Fig. 1A to 1F in the side view in a greatly simplified form various steps in the production of packaging bags with bottom reinforcement according to a preferred embodiment of the invention;

2 is a plan view from above of an adhesive application in the form of a plurality of transverse adhesive beads according to an embodiment of the invention;

FIG. 3 shows the configuration of FIG. 2 after the folding section has been folded over; FIG.

Fig. 4 in plan view from above an adhesive application in the form of several obliquely or extending in the longitudinal direction

Adhesive beads according to another embodiment of the invention;

Fig. 5 in plan view from above an adhesive application in the form of several adhesive dots according to another

Embodiment of the invention; Fig. 6 in perspective side view of a packaging bag with

Floor reinforcement as known in the art;

7 shows a known from the prior art, continuous spiral adhesive application for soil reinforcement.

Fig. 8 shows a preferred embodiment of a device according to the

Invention in side view;

9 shows the device from FIG. 8 in a perspective illustration; FIG.

FIG. 10 shows, in a representation comparable to FIG. 8, the device viewed from the other side, wherein the distance between the cutting unit and the processing unit is set at a maximum; FIG. and

FIG. 11 shows, in a somewhat simplified representation comparable to FIG. 9, the device with maximum distance between the cutting unit and the processing unit.

FIG. 12 is a perspective view of another embodiment of a soil treatment unit according to the invention; FIG. and

13 is a side view of the soil working unit 11.

WAYS FOR CARRYING OUT THE INVENTION

Fig. 1 shows in several sub-figures Fig. 1A to 1 F in the side view in a greatly simplified form various steps in the production of packaging bags with bottom reinforcement according to a preferred embodiment of the invention. The device 10 for producing a packaging bag according to FIG. 1A comprises a cutting unit 12 and a Soil processing unit 11, which are arranged along a horizontal transport plane 13 in a row. Between the two units 11 and 12, a transport device 15 is provided in the form of a belt running on rollers. The transport device 15 is omitted in the subfigures 1C to 1F for clarity. The left-hand roller of the transport device 15 is part of a pair of rollers 16 with the aid of which the film web (20 in FIG. 1B) can be precisely drawn into the floor-processing unit 11 and held there in the intended processing position. The distance between the two units 11 and 12 corresponds to the length of the packaging bag (L in Figure 1 F) and can preferably be adjusted. The transport device 15 is then correspondingly adjustable in length.

In the cutting unit 12, a knife 14 is provided, with each of which a packaging bag is separated from the continuous film web 20. The blade 14 is indicated schematically in FIG. 1 as a knife bar cutting from top to bottom. In a preferred embodiment of the device, the knife is designed as a transversely movable knife arranged below the transport plane 13, which transversally cuts through the film web 20 and thereby dips into the groove of a clamping bar (41 in FIG. 8) from above presses on the film web 20 and this fixed.

In the processing unit 11, the transport plane 13 runs over a behind the pair of rollers 16 arranged holding device 18, which is supplied with negative pressure and on the top suction openings (38 in Fig. 2), can be sucked by the negative pressure overlying the film web 20 and fixed , Above the holding device 18, a transversely extending row of a plurality of spaced adhesive nozzles 17 is provided, through which a suitable hot-melt adhesive, which is supplied via not shown heated or thermally insulated feeds, can be sprayed onto the upper side of the film web 20. In the transport direction (from right to left) behind the holding device 18, a folding device 19 is placed, which comprises a transverse bar, which due to a hinge mechanism (48 in Fig.10) while maintaining its orientation upwards, the holding device 18 and on the holding device 18 can be pivoted down (see Fig. 1D to 1F). The folding device 19 folds a folding section 21 projecting beyond the holding device back onto the film web 20 in order there to form the bottom reinforcement of the next packaging bag by bonding to one side of the film web 20.

At the beginning of the processing cycle (which takes a total of about 1 s, for example), the (continuous) film web 20 by means of a (not shown) transport device right before the cutting unit 12 (42 in Fig. 8, 9), the transport device 15 and by means of the roller pair 16 with its free end through the cutting unit 12 so far forward in the processing unit 11 in that it protrudes with a track portion of predetermined length, which corresponds to the folding portion 21, over the holding device 18 (Figure 1B). The pair of rollers 16 is operated with a relation to the transport device 42 by about 1% higher speed, so that the film web is always pulled taut. Since the film web 20 is still uncut at this time, the section of the film web 20 provided for the next packaging bag can be introduced into the processing unit 11 with high positioning accuracy and without slipping. In the region of the holding device 18, a sensor is arranged, which detects the presence of the film web and gives corresponding signal to the control of the processing unit 11.

As soon as the film web 20 has reached its end position according to FIG. 1B, the film web is severed in the cutting unit 12. The separated section is now fixed by the roller pair 16, and the holding unit 18, which switches the negative pressure to the suction openings 38 by means of built-in valves. In addition, at the side edges and / or in the middle of the film web 20 still more hold-down (23, 24 in Fig. 2, 11) are provided, which are formed as resilient metal strips and the film web 20 at the edges or hold down in the middle to the folding line (22 in Fig. 2). Almost simultaneously with the severing of the film web 20, adhesive is briefly applied to the upper side of the cut-off packaging bag by the adhesive nozzles 17 (FIG. 1C), which is indicated by an arrow on the adhesive nozzle 17. Depending on the type of adhesive application, the nozzle assembly can be moved in different directions, whereby correspondingly formed and oriented adhesive beads arise (see Fig. 2-4). Under an adhesive bead is essentially understood an adhesive application along a predetermined contour. The contour can be understood, for example, as a straight line, as a continuous line or as a point. But it can also be a combined movement of the nozzles 17 and the film web 20 are provided to achieve a certain adhesive application. In this case, the film web would be the adhesive application is not fixed by vacuum. Due to the arrangement of a plurality of adhesive nozzles 17, a plurality of adhesive beads or adhesive portions can be applied approximately simultaneously. Such individual adhesive sections do not extend over the entire width of the bag, but over a plurality of smaller sections or adhesive sections. By applying the adhesive with a plurality of adhesive nozzles 17, the time between the beginning of the adhesive application and the folding after the application of the hot-melt adhesive, ie the effective bonding, can be reduced. This ensures that the temperature of the adhesive drops only insignificantly before it can form a connection with the folding section 21.

The almost simultaneous application can be carried out simultaneously or at different times for all adhesive sections. The term "offset in time" is understood to mean that the adhesive application is to be started for all adhesive sections within a certain period of time. In particular, the time period should not exceed the time required for the application of an adhesive portion. Preferably, the adhesive portions are adjacent or spaced apart or overlapping each other. This depends on the length of the adhesive section. If the adhesive portions are adjacent to each other, the two adjacent adhesive portions touch. In the spaced apart arrangement, there is a gap between the adhesive sections without adhesive. In the overlapping arrangement, the adjacent adhesive portions overlap.

Immediately (a few tenths of a second) after application of the hot-melt adhesive (FIG. 1C), the folding section 21 projecting beyond the holding unit 18 is folded upwards along the fold line 22 by means of the pivotable folding device 19 and pressed from above onto the film web. The fold line 22 may already be predetermined by a score line or bead, which has been introduced in advance in attaching the transverse welds in the film web 20, and facilitates the folding. For example, it is conceivable to make the score line or bead with a preheated beam. The preheated bar can easily deform the bags 30 in the desired section. To fold over, the bar-shaped folding device 19 engages under the folding section 21 at the beginning of the pivoting operation and moves upward (FIG. 1D), then folds the folding section 21 back against the transport direction (FIG. 1E) and then presses on the folding section 21 the film web 20 (FIG. 1 F), wherein the applied hot-melt adhesive intimately connects with both the folding section 21 and the film web 20. Since the adhesive application from several nozzles simultaneously and only over short distances and the folding process connects directly, the entire process can be completed in a very short time. The hot melt applied in the molten state thus retains its full bondability during the tillage operation, so that the gluing of the folding section is very stable and resistant.

As part of the distributed and multiple simultaneous adhesive application a variety of configurations are conceivable within the scope of the invention. Some of the most preferred types of adhesive application are shown in Figs. 2-5 3 three adhesive beads 25 are produced from three juxtaposed and transversely moving to the transport direction adhesive jets or adhesive jets at rest film web, which then at three points gluing the folding portion 21 with the film web 20 and the already cut packaging bag section effect (Fig. 3). The adhesive nozzles 17 may return to their original position after application of the adhesive beads 25 for the next adhesive application. It is even easier if the adhesive nozzles are moved back during an adhesive application and back again during the next subsequent adhesive application.

In order to achieve, in addition to a transversely extending adhesive bond, an adhesive stretching extending in the transport direction, oblique adhesive beads 26 can be applied according to FIG. The oblique course can be generated either by a corresponding method of adhesive nozzles 17 or adhesive jets, or by appropriate superposition of two orthogonal movements of the adhesive nozzles 17 (adhesive jets) and the film web 20 itself.

It can also be seen in FIG. 4 that the adhesive application can optionally be effected before and / or behind the fold line 22. If analog adhesive beads 27 are also applied on the other side of fold line 22, crossed adhesive webs are produced after folding. The adhesive beads on both sides of the fold line 22 may also be oriented so that they lie exactly on top of each other after folding. In this way, the adhesive beads are optimally anchored in the film material, and when folding connects directly to the adhesive of the superimposed adhesive beads.

But it is also conceivable, as shown in FIG. 4, either at dormant adhesive nozzles 17 or Kiebstoffstrahlen only by a corresponding feed of

Film web 20, or at resting film web 20 by methods of

Adhesive nozzles 17 extending in the transport direction in the longitudinal direction To produce adhesive beads 28, which can also extend beyond the fold line 22 away. These adhesive beads 28, of which only one is shown by way of example in FIG. 4, can be exposed at the fold line 22. If they are guided to the outer edge of the folding portion 21 and on the other side of the fold line 22 insert accordingly early, so the soil reinforcement can be glued over the entire gain range.

It is further conceivable, according to FIG. 5, to apply glue dots 29 instead of or in addition to elongated adhesive beads of the type shown in FIGS. 2 and 4. These glue dots 29 may be arranged in a straight line as shown in FIG. 5; however, they can also be distributed over the width of the film web 20 in another configuration (eg along a zig-zag line). The glue dots 29 can be applied even faster than the adhesive beads. The adhesive nozzles 17 may also be movable in the vertical direction (see FIG. 11).

A preferred embodiment of a device according to the invention is shown in Fig. 8 (and Fig. 10) fragmentary in side view. The main parts of the device have already been shown schematically in FIG. The device 10 is constructed on a subframe not shown in detail, which, inter alia, allows the displaceability of the cutting unit 12 relative to the processing unit 11 to adapt to different bag lengths (in Fig. 8, the minimum distance between cutting unit 12 and processing unit 11 is set; Transport device 15 arranged between cutting unit 12 and processing unit 11 is received by a movable arrangement of deflection rollers provided below the device; in FIG. 10, the maximum distance is set). The uncut, continuous film web is transported from the right by means of a directly before the cutting unit 12 arranged first drive unit 42, which is equipped with a motor-driven roller pair, through the cutting unit 12 passes into the processing unit 11, where the end of the film web from the pair of rollers 16 received and is further transported to the holding unit 18 and shortly thereafter. To the holding unit 18 extends from below coming a plurality of vacuum lines 47, which via arranged in the holding unit 18 valves to the intake ports 38 (in Fig. 2 are two examples drawn) lead, whose function has already been described above.

9, in the exemplary embodiment a total of 8 adhesive nozzles 17 are uniformly spaced from each other for two film webs to be processed side by side, ie four nozzles each for a film web, as shown in FIG two nozzles for two webs available), which are supplied by thermally insulated adhesive feeds 43 with the hot melt adhesive. The adhesive nozzles 17 themselves are heated and controlled by a valve located immediately behind the nozzle. In the example of FIGS. 8 and 9, the adhesive nozzles 17 are mounted stationary. Of course, they can also be designed to be movable transversely.

The roller pair 16 not only guides the film web to the holding device 18, but also transports the cut and finished bag on the bottom to a subsequent transport device 39, where the bag between two parallel belts 45, 46 pressed for subsequent treatment (control, packaging, etc.). ) is transported. By compressing the bags between the bands, the bonding process in the bottom area is mechanically supported until the hot glue has cooled sufficiently. The two belts 45, 46 are driven by a second drive unit 40. Both the two bands 45, 46 and the band 44 are subdivided into a multiplicity of separate subbands, as can be seen in FIGS. 9 and 11.

Figures 12 and 13 show another embodiment according to the present invention. Identical parts are provided with the same reference numerals. Furthermore, features of the preceding embodiments be combined with each other and with this further embodiment as desired to new embodiments. The arrow T represents the transport direction.

As shown in FIG. 12, the device further comprises a hold-down device 100. The hold-down device 100 comprises a drive 101, a coupling element 102, a transmission rod 103, a plurality of fastening elements 104 and hold-downs 105 fastened thereto. The drive 101, which is here as a pneumatic cylinder is shown, brings a movement via the coupling element 102 on the transmission rod 103. In this case, the coupling element 102 is moved due to its storage in a pivoting movement. With a similar movement, the transmission rod 103 is moved. On the transmission rod 103, the fasteners 104 are mounted stationary or movable. Each of the fastening elements 104 comprises a hold-down 105, which projects in the direction of the splice spot 125. The hold-down 105 is preferably designed as a flexible sheet, in particular made of spring steel. The hold-down 105 may also be referred to as finger-shaped design.

Between two adjacent adhesive nozzles 17, a hold-down device 100 is preferably placed in each case. The hold-down 105 protrudes into a region between two adhesive sections or splices 125, so that the hold-down 105 does not come into contact with the adhesive.

The drive of the hold-down device is actuated with the retraction of the bag in the soil working unit 11. The hold-downs 105 protrude into the region of the folding portion 21 of the bag and press the bag against the transport plane 13. After applying the adhesive and performing the folding, the drive of the hold-down device is actuated again and the hold-down drive against the transport direction of the device the space between the bag and folding section 21 back with a pivoting movement. Also shown in FIGS. 12 and 13 is a further embodiment of the folding device 19. The folding device 19 shown here comprises a folding beam 190, which is connected to the left and right of the transport direction with a folding lever 191. The folding lever 191 is driven by an unillustrated servomotor. Once the adhesive is applied, the folding lever 191 performs a rotational movement, and thus moves the folding beam 190 in the direction of the folding portion 21 of the bag. In the further movement of the folding section 21 is taken and folded in the direction of splices and pressed there. By relative displacement of the folding beam 190 to the center of rotation, the folding beam can be adjusted depending on the thickness of the bag material to be folded. The folding beam is moved along the arrow F. Other alternative folding types or folding devices are also conceivable.

LIST OF REFERENCE NUMBERS

10 Apparatus for producing a packaging bag

11 tillage unit

12 cutting unit 13 transport plane

14 knives

15.39 transport device (band-shaped)

16 pairs of rollers

17 adhesive nozzle 18 holding device (negative pressure)

19 folding device

20 film web (tubular)

21 folding section

22 fold line 23,24 hold-down

25,26,27,28 adhesive bead

29 glue point 0 packaging bag 1 filling opening 2 bottom area 3 glue application

34 front side

35 back side

36, 37 gusset

38 intake opening

40.42 drive unit

41 clamping bars

43 adhesive feed (thermally insulated)

44, .., 46 conveyor belt

47 Vacuum line

48 joint mechanism (folding device)

100 hold-down device

101 Drive for hold-down

102 coupling element

103 transmission rod

104 fasteners

105 hold down

190 folding beams

191 folding lever

125 adhesive section

L length (bag)

T transport direction

F folding direction

Claims

A method of manufacturing plastic bag packaging bags (30), which method has one end of the film

Packaging bag (30) arranged portion of the packaging bag (30) as a folding portion (21) along a transverse fold line (22) folded upwards and bonded to the packaging bag (30), wherein prior to folding an adhesive to at least one of the two Placed surfaces and adhesive is used as a hot-melt adhesive, characterized in that the adhesive in the form of a plurality of adhesive portions (25, .., 29, 125) is applied approximately simultaneously.

2. The method according to claim 1, characterized in that the adhesive portions (25, ..., 29, 125) are arranged adjacent to each other or spaced apart or overlapping.

A method according to any one of the preceding claims, characterized in that the packaging bag (30) has a reinforced bottom portion (32) and that said portion is a lower end portion.

4. The method according to any one of the preceding claims, characterized in that the packaging bag is closed at the end to be folded in particular with a weld.

5. The method according to any one of the preceding claims, characterized in that the adhesive application in the form of a plurality of individual, over the width of the packaging bag (30) arranged distributed, short adhesive sections (25, .., 29) takes place.

6. The method according to any one of the preceding claims, characterized in that each of the adhesive portions (25, .., 29) of the adhesive application is assigned its own adhesive nozzle (17).

7. The method according to any one of the preceding claims, characterized in that the adhesive portions in the form of adhesive beads (25, 26, 27, 28), and that for applying the adhesive beads (25, 26, 27, 28) of the packaging bag and / or the adhesive nozzles (17) are moved.

8. The method according to claim 7, characterized in that the

Adhesive beads (25) extend transversely to the bag longitudinal direction.

9. The method according to claim 7, characterized in that the adhesive beads (26, 27) extend obliquely to the bag longitudinal direction.

10. The method according to claim 7, characterized in that the adhesive beads (28) extend in the bag longitudinal direction.

11. The method according to any one of claims 9 or 10, characterized in that the adhesive beads (28) traverse the fold line (22).

12. The method according to any one of claims 1 to 6, characterized in that the sections have the form of adhesive dots (29) or of adhesive lines.

13. The method according to any one of claims 1 to 12, characterized in that the adhesive is applied to both surfaces to be bonded so that adhesive applications of both surfaces come to rest on each other when folding.

14. The method according to any one of claims 1 to 13, characterized in that immediately after completion of the adhesive application, the folding portion (21) folded over and pressed onto the packaging bag (30).

15. The method according to claim 14, characterized in that the

Adhesive application and the subsequent folding and pressing of the folding section (21) takes place in a period of a few tenths of a second.

16. The method according to any one of the preceding claims, characterized in that the bag (30) is held during the application of the adhesive and / or during the folding by means of hold-downs (105) which between the adhesive portions (25, .., 29, 125 ) protrudes.

17. The method according to any one of claims 1 to 16, characterized in that the individual packaging bag (30) by a continuous tubular film web (20), which is transversely welded upstream of the later separation points, is cut off, that the free end of the film web (20 ) is first transported in each case provided for the adhesive application position and held there, that then the packaging bag (30) is separated from the film web, and that applied immediately after the separation of the adhesive and the folding section (21) is folded over.

18. The method according to claim 17, characterized in that the free end of the film web (20) rests in the position provided for the adhesive application position with the underside on a holding device (18) and is held there by means of negative pressure, that the free end of the film web ( 20) protrudes freely beyond the holding device (18) in the position provided for the adhesive application with the folding section (21), and in that the freely projecting folding section (21) is moved over the entire width along the folding line (22) by means of a pivotable folding device (19) ) is folded over.

19. Device (10) for carrying out the method, characterized in that along a transport plane (13) an adhesive device (17) and a folding device (19), in particular a soil treatment unit (11) are arranged one behind the other in the transport direction, and that the folding device (19) for folding over a folding section 21 of the packaging bag (30) to be produced and immediately before the folding device (19), the adhesive device (17) is provided with a plurality of distributed adhesive nozzles (17), which for simultaneous application of a hot melt adhesive for a plurality of Adhesive sections (25, .., 29, 125) are formed.

20. The device according to claim 19, characterized in that a hold-down device (100) with a plurality of hold-downs (105) is arranged, wherein a hold-down (105) between two adjacent glue nozzles (17) is arranged, so that the hold-down (105) between the adhesive portions (25, .., 29, 125).

21. The device according to claim 19, characterized in that along a transport plane, a cutting unit (12) and the soil treatment unit (11) are arranged one behind the other in the transport direction, wherein the film web (20) by the cutting unit (12) can be guided, and that means ( 16, 42) for

Feeding a continuous tubular film web (20) for

Adhesive device (17) and folding device (19) in the transport plane (13) are provided.

22. The apparatus according to claim 19, characterized in that the

Adhesive nozzles (17) are arranged transversely to the bag longitudinal direction or transport direction.

23. The device according to claim 19, characterized in that within the soil treatment unit (11) in the region of the adhesive nozzles (17) is provided with a negative pressure holding device (18) which sucks the film web lying on it (20) during processing and holds ,

24. The device according to claim 23, characterized in that above the holding device (18) down device (23, 24) are arranged, which hold down the film web (20) at the edges on the holding device (18).

25. Device according to one of claims 19 to 24, characterized in that the distance between the cutting unit (12) and the processing unit (11) in the transport direction is adjustable, and that between the two units (11, 12) adjustable in length , first belt-shaped transport device (15) is arranged.

26. Device according to one of claims 19 to 25, characterized in that behind the processing unit (11) a second belt-shaped transport device (39) with two parallel belts (45, 46) is provided, between which the finished packaging bags are transported compressed ,

27. Device according to one of claims 19 to 26, characterized in that the folding device (19) comprises a transversely arranged to the transport direction pivotable beams.

28. Device according to one of claims 19 to 27, characterized in that the adhesive nozzles (17) above the transport plane (13) are mounted stationary.

29. Device according to one of claims 19 to 27, characterized in that the adhesive nozzles (17) above the transport plane (13) are mounted movable in the transverse direction.

30. A method of producing plastic bag packaging bags (30) having a reinforced bottom portion (32), which method comprises a portion of the packaging bag disposed at the lower end of the packaging bag (30) (30) folded as a folding section (21) along a transverse fold line (22) upwards and bonded to the packaging bag (30), wherein applied prior to folding an adhesive on at least one of the two surfaces to be bonded and used as an adhesive adhesive is characterized in that the application of the adhesive and the subsequent folding of the folding portion (21) takes place so that the adhesive connects substantially over the entire length of the adhesive application with the two surfaces to be bonded.

31. Device (10) for carrying out the method, characterized in that along a transport plane (13) a cutting unit (12) and a soil treatment unit (11) are arranged one behind the other in the transport direction, that means (16, 42) for supplying a continuous tubular Film web (20) by the cutting unit (12) for soil treatment unit (11) in the transport plane (13) are provided, and that within the soil processing unit (11) a folding device (19) for folding a folding portion 21 in the bottom region (32) of the packaging bag to be produced (30) and immediately before the folding device (19) a plurality of transversely to the bag longitudinal direction or transport direction distributed adhesive nozzles (17) is provided, which are designed for applying a hot melt adhesive.