WO1995035237A1

WO1995035237A1 - Process for device for packing objects in portions

Info

Publication number: WO1995035237A1
Application number: PCT/EP1995/002357
Authority: WO
Inventors: Wolfgang Stederoth
Original assignee: Maschinenfabrik Spang & Brands Gmbh & Co.
Priority date: 1994-06-18
Filing date: 1995-06-19
Publication date: 1995-12-28
Also published as: DE4421366A1

Abstract

The device for packing objects or loose material in portions has a gathering device (24, 26) for radially gathering a net or foil tube (16) and an ultrasonic welding tool (32, 38) for making two adjacent weld seams in the gathering region. In order to reduce the load on the weld seam with short clock signals and when the tube is filled from above, there is an inertia brake which may by formed by parts (24, 33) of the gathering device (24, 26) and a welding tool (32, 38). The weld seams are side-by-side because a blade (44) forms parts of the welding tool (32, 38). Teeth on the pressure surfaces of the welding tool (32, 38) ensure short weld seams. The quality of the weld seam is improved by at least partially surrounding the gathered tube material (16) with a foil strip (54).

Description

Method and device for portion-wise packaging of objects

The invention relates to a method for portion-wise packing of objects or bulk material, in which a portion is introduced from above into a net tube closed at the lower end, which is then gathered radially above the portion, at two axially adjacent locations is closed and cut in between.

It is known to gather previously separated and filled foil bags radially at their upper end and to seal them using the ultrasonic welding method. Because only a single, already filled bag is fed to the closing device and the weld seam is not stressed immediately after the welding process, this method is unproblematic. This also contributes to the fact that tensions are distributed on all sides in a film material and do not attack the weld seam at certain points.

It is also known to axially gather a mesh hose on the outer circumferential surface of a filling tube and to gradually pull it downward against the action of a hose brake via its outlet opening. Fillings are poured into the tube end closed at the bottom and then the tube is constricted radially above the portion, closed by two clips spaced apart and cut through between them. The clips have the advantage that the closure produced with them is immediately fully loadable, but also the disadvantage that they consist of a different material to be separated during disposal than the bag, in many cases damage the net material and one complicated, mechanically prone locking mechanism.

ORIGINAL DOCUMENTS The invention is therefore based on the object of providing a packaging method of the type mentioned at the outset and a device suitable for carrying it out, by means of which homogeneous net packaging can be produced and the packaging process can be carried out very quickly and reliably using simple means.

According to the proposal of the invention, the above object is achieved in terms of method in that the mesh tube is closed by ultrasonic welding and the next portion is already introduced into the mesh tube while the pressure of the welding tool is still being maintained, the welding point being by weight this portion of the tensile forces exerted is largely relieved by temporarily supporting the portion after insertion into the mesh tube and / or temporarily holding the mesh tube between the portion and the weld.

The device provided according to the invention for carrying out this method has at least one filler tube oriented vertically or obliquely downwards, on the outer surface of which an axially gathered net or film tube can be pulled, which can be pulled off in a controlled manner, one below The shirring tool arranged radially for constricting the net hose, a closing device and a cutting device are arranged at the outlet opening of the filling tube. What is new about the device is that the closing device has an ultrasonic welding tool, above which a drop brake is arranged to relieve the strain on the welding point in the welding tool from the weight of a portion falling from the filling tube into the hose.

The invention offers the advantage that, with a very simple device, a very short cycle time and a network packaging consisting of only a single material are achieved become. The success is essentially due to the fact that the network threads, which are loaded to different degrees when the portion is introduced into the network, cannot punctually stress the weld seam because the drop brake absorbs the shock-like tensile forces. In this context it has to be taken into account that during ultrasonic welding the welding heat is generated in the material to be welded. The welding tool remains cold and supports the cooling of the weld seam if it remains closed for a certain period of time after the ultrasonic welding process. The transition between the welding zone and the adjacent, not softened material is, however, abrupt. There is a clear step or a step-like material thinning at the point where the material softens and has been compressed by the pressure surfaces of the ultrasonic welding tool. The step-like thinning of the material of the outer threads of the gathered and compressed net strand during welding would lead to breakage at the transition point when such individual threads are subjected to an impact, whereas possibly no damage would occur under similar conditions with foils due to the stress distribution in the material . The risk is greater when filling a radially gathered hose material than with non-gathered cross seams, because the weld seam produced after the radial gathering is very short and therefore all the forces that otherwise occur across the width are concentrated there. In addition, in the case of knitted nets, the breakage of even a single thread normally leads to a running stitch, that is to say a large hole in the net and thus leads to uselessness.

The drop brake can be formed by special cushions, funnels, rollers and / or releasable clamps or brakes, which hold the net hose temporarily clamped or form-fitting in front of the welding point, but is preferably achieved solely through the design of the gathering tool and the ultra sound welding tool realized by z. B. the shirring tool has a substantially horizontally displaceable slide which can be advanced from a starting position radially retracted from the opening with its front edge beyond the opening into a closed position and alone or together with one laterally next to the opening of the The filling tube arranged in the filling tube gathers the hose radially, and in that the sonotrode and / or the anvil of the ultrasonic welding tool can be displaced into a closed welding position lying to the side of the vertical projection of the outlet opening and the welding tool and / or the gathering tool have a deflection edge have on which the hose between the closed welding tool and the outlet opening can be deflected with braking effect.

The portion is expediently introduced into the net tube at a point in time while the slide is still in its advanced position. In this position, the portion is caught by the laterally displaced net on the top of the slide. Furthermore, the above-mentioned deflection edge, at which the gathered net hose between the catch point and the welding point is bent like a kink, ensures that the particularly heavily loaded net threads are braked and their tensile forces to a large extent even before the welding point of parts of the shirring - And / or welding tool are included.

In a further preferred embodiment of the invention, the above-described step-like thinning of the material of the threads lying outside during the welding process can be avoided by introducing film material between the network tube and the welding tool at least at one closure point before the ultrasonic welding process. Then, during the welding process, the outer material is thinned at the transition point to the welding zone in the outer film material. material. This can simply be an additional material for improving the quality of the weld seam. However, it is advisable to weld a printed or printable film strip, which also has the function of e.g. B. may have a label or other tag of the mesh bag. The thinning of the material now occurs in the film strip, but is harmless there because it is normally not a load-bearing part and tensile forces are better distributed therein than in a network.

The two closures of the hose are expediently carried out simultaneously with a single ultrasonic welding tool and then the hose is severed between the two closures. This can be done with a knife or scissor-like cutting tool with a special drive. However, an embodiment of the ultrasonic welding tool is preferred in which there is a narrow projection on the sonotrode and / or on the anvil between the pressure surfaces for producing the closures of the hose, which projection extends at least over the width of the welding point and a smaller distance from the opposite one Has the area of the other welding tool part than the pressure surfaces. In this way, an extremely thin material zone can be produced between the two weld seams, which zone tears under the effect of the weight of the filled bag when the welding tool is opened, so that the bag is separated.

Some exemplary embodiments of the packaging device according to the invention are explained in more detail below with reference to the drawing, in which the essential tool parts and their movements are shown schematically. Show it: Fig. 1

A, B A simplified side view and

Top view of a device for portion-wise packaging of objects in mesh bags, the parts of the device being in the starting position while the objects are being filled into a mesh tube closed at the lower end;

Fig. 2

A, B side view and top view of the device according to FIGS. 1A, B during the gathering of the net tube above the filled objects;

Fig. 3

A, B side view and top view of the device according to FIGS. 1A, B during the closing of the net tube above the filled objects;

4 shows a longitudinal section through the mesh tube in the gathered area and the adjacent parts of an ultrasonic welding tool;

Fig. 5

A, B show a simplified vertical cross section and a plan view of an ultrasonic welding tool with an integrated knife in an intermediate position which has been modified compared to the embodiment according to FIGS. 1 to 4; Fig. 6

A, B cross section and top view of the

5 A, B in the

Welding position;

7 shows a partial cross section through the weld seam produced with the welding tool according to FIGS. 5 and 6;

Fig. 8

A, B show a simplified cross-section and a top view of a modification of the welding tool according to FIGS. 5 and 6 and of the co-operating shirring tool in a position after shirring, but before closing and connecting a net tube with an outer film strip;

9 shows a schematic diagram for the axial feed of the film strip in the gathering and welding tool according to FIGS. 8 A, B;

Fig. 10 is a schematic representation of a lateral feed of the film strip to the weld.

The device shown in FIGS. 1 to 4 includes a filling tube 10, which is attached to an only indicated machine frame 12 in an obliquely downward position. Objects 14 to be packaged are filled in portions at its upper end. It can be z. B. to one or more pieces of fruit or vegetables, each a single Mei¬ ball, confectionery or any other piece goods to be enclosed in mesh bags. The next- The device described above can, in principle, have the same structure but also for packing bulk goods, eg. B. food, in foil bags that can be sealed in the ultrasonic welding process, use.

In the exemplary embodiment, a supply of net hose 16 sits axially on the fill tube 10. The lower end of the net tube 16, designated 18, is welded closed, so that a portion of the objects 14 to be packed, filled through the fill tube 10, is in the closed lower end of the net tube 16, which depends by a certain amount from the outlet opening 20 of the filling tube 10. A net brake, not shown, arranged on the filling tube 10 ensures that the weight of the objects 14 to be packaged does not pull further net hose 16 from the filling tube 10.

The outlet opening 20 formed by the lower end of the filling pipe 10 is located at a short distance above a cover plate 22 which is fixedly attached to the machine frame 12 and which is aligned with the filling pipe 10 with such a large opening that the bottom of the Filling tube 10 falling objects 14 freely through this opening in the cover plate 22. The lower end of the net hose 16 also extends through the opening in the cover plate 22. This has the primary function of covering the movable tool parts described below and thereby preventing operational accidents. The arrangement of the outlet opening 20 above the cover plate 20 has the advantage that two filling tubes 10 may be present, which are used alternately and are brought into the working position shown, while the other filling tube 10 in the meantime has been provided with a new network supply can be. A gathering tool is first installed below the cover plate 22 and consists of a slide 24 which interacts with a stationary gathering part 26. Both the slide 24 and the packer part 26 have a U-shaped vertical cross section according to FIG. 1A. Both the upper and the lower legs in the form of raffler plates of the slide 24 and the stationary raffler part 26 are cut out in a V-shape on their opposing front edges, as shown in FIG. 1B. In the middle of the V-shaped cutout in the legs of the stationary gathering part 26 there is a slot 28 which is dimensioned sufficiently large that it can accommodate the net hose 16 gathered at one point.

The slide 24 can be moved back and forth below the cover plate 22 in the direction of the horizontal directional component of the filling tube 10 according to the double arrow 30. From the retracted position shown in FIG. 1B under the outlet opening 20 with reference to FIG. 1B, it can move so far to the left that the mesh tube radially extends from the inclined surfaces of the V-shaped cutouts of the legs of the slide 24 and the gathering part 26 is gathered and pushed into the slots 28.

After the net tube 16 has been gathered radially in this way at two points and the parts of the device are in the position shown in FIGS. 2A, B, the net tube is tightly closed in the gathered area by ultrasonic welding. For this purpose, one half of an ultrasonic welding tool, in the example the anvil 32, also travels horizontally, but according to the double arrow 34 transversely to the direction of movement of the slide 24 between the legs of the packer part 26. Similar to the packer part 26, the anvil 32 has in the direction of movement FIG. 1B a U-shaped cross section, the two legs 33 of which are each provided with a V-shaped cutout that is open towards the front, to which a slot 36 connects in the middle position. Like the slide 24, operated by a cylinder-piston unit pressure medium, for. B. pneumatic, slidable anvil 32 moves after gathering laterally next to the outlet opening 20 of the filling tube 10 and below it as far between the legs of the packer part 26 until the gathered area of the mesh tube 16 are in the slot 36. Since in this position the slots 36 in the legs of the anvil 32 intersect with the longitudinal slots 28 in the legs of the packer part 26, the net tube 16 is bordered and caught all around at the gathered points.

At the end of the retracting movement of the anvil 32 in the direction of the arrow 34, according to FIG. 3B, where the shirring tool parts have been omitted to simplify the illustration, it shifts with its upper leg over the upper part and with its lower leg under the lower part in a vertical longitudinal section U-shaped sonotrode 38. The anvil 32 moves so far that the mesh tube in the gathered area according to FIG. 4 is compressed between pressure surfaces 37 on the front edges of the legs of the sonotrode 38 and opposite counter pressure surfaces 39 on the anvil 32 (the remaining parts of the welding tool have been omitted in FIG. 4). In this position of the parts, the sonotrode is activated for a fraction of a second, and as a result the mesh tube 16 is welded together at the two points shown in FIG. 4 at an axial distance.

While the anvil 32 is still pressed against the sonotrode 38, the net tube 16 is cut by a scissor-like cutting device, indicated by arrow tips 35 in FIG. 4, between the two welding points. The cutting edges of the scissor arms can have a concave shape in order to prevent the plastic threads of the net tube 16 from escaping during the cutting process. Besides, can already while 3B and 4 are still in the closed position according to FIG. 3A, the next portion of objects 14 to be packed are filled into the network tube 16 via the filling tube 10. The control can be selected so that these objects first fall onto the plate forming the upper leg of the slide 24, which thus also serves as a collecting plate. This prevents a sudden load on the fresh weld. With a relatively light weight of the objects to be packaged, the slide 24 can also be retracted as shown in FIG. 3A if the objects fall into the net tube above the welding point. In both cases there is a very short work cycle, because the welding and filling process can take place simultaneously and the slide 24 can move forward again immediately thereafter.

The clamping of the net tube 16 between anvil 32 and sonotrode 38 absorbs three different forces, namely the weight of the already packaged objects 14, the reaction forces arising during the cutting process and finally the rest of the impact and weight forces of the next portion falling into the net tube 16. However, the last-mentioned forces can largely be kept away from the welding point in that the net tube 16 above the welding point, at the upper edge of the slot 36, is bent essentially at right angles to the outlet opening of the filling tube 10. The impact and weight forces of the objects falling into the net tube therefore essentially only load the deflection edge at the slot 36 in the upper leg 33 of the anvil 32, which acts as a deflection member.

After the welding process has ended, the anvil 32 moves back into its starting position according to FIG. 1B, the severed lower part of the net hose 16 falling down as a filled bag closed at both ends, and that - 12 -

The new end of the net tube 16 again hangs vertically, as shown in FIG. 1A. Only now do the filled objects 14 fall against the lowermost end and the weld seam that has meanwhile solidified. If the slide 24 then moves forward again and detects the net tube 16 above the filled objects 14 and laterally displaces it beyond the vertical projection of the outlet opening 20 of the filling tube 10, a certain length of net tube becomes again against the action of the net brake deducted from the fill tube 10, and the next gathering and closing process begins.

The embodiment according to FIGS. 1 to 4 permits numerous modifications. So z. B. the filling tube 10 can also be oriented vertically. The cover plate 22, which is insignificant for the function, can be replaced by any other cover or, if appropriate, also missing. The slider 24 could also advance against the network hose 16 from any other side. If no other braking device is provided, the lateral displacement of the net hose by the slide 24 is essential, so that on the one hand further net hose is pulled off the filling tube 10 and on the other hand the kink-like deflection of the net tube above the welding point shown in FIG. 3A is obtained , which is important for the interception of the forces exerted by the newly filled objects.

There are further possible modifications with regard to the shape of the gathering tools and the welding tool. These do not necessarily have to be separate tools. In an alternative embodiment of the invention, e.g. B. the slide 24 also take over the function of the anvil, while the packer part 26 also serves as a sonotrode. In both cases, instead of two welding points with an axial spacing, a single, larger welding point can be created, which is then severed in the axial center. For In addition to scissor-like cutting devices, the cutting process also includes cutting knives, saw-like cutting tools, glow wires and other cutting devices.

5 and 6, an ultrasonic welding tool is shown, in which the cutting device is integrated, so that it requires no special drive and no control. In this embodiment, the anvil 32 consists of a main body 40 which is firmly connected to the upper and lower plates which form the legs 33 by screws 42. In its front area, the main body 40 contains a horizontal transverse slot in which a knife plate 44 is seated, the cutting edge 46 of which protrudes a little outwards beyond the pressure surfaces 39 on the front side of the main body 40. The exact position of the cutting edge 46 with respect to the pressure surfaces 39 can be adjusted by means of an indicated adjusting screw 48. In the adjusted position the knife plate 44 is held clamped by clamping screws 50 which are screwed into the main body 40 next to the knife plate 44 and when tightening the horizontal receiving slot of the knife plate narrow.

A further special feature of the welding tool according to FIGS. 5 and 6 is that the pressure surfaces 37 and 39 are formed with teeth, as best seen in FIG. 5B. The teeth extend in the vertical direction, ie axially with respect to the mesh tube, and in plan view have a sawtooth-like profile with symmetrical, straight flanks in the example. The tooth height and tooth width are uniform over the width of the pressure surfaces 37 and 39 and also the same on both opposite surfaces. However, the teeth are arranged on a gap, so that, for. B. The tooth of the sonotrode 38 lying on the center line in FIG. 5B on the anvil 32 side is opposite a tooth gap in the pressure surfaces 39. 5 and 6, the vertical distance between the upper and lower pressure surface 39 of the anvil 32 and, accordingly, the vertical distance between the pressure surfaces 37 of the sonotrode can be reduced substantially to the thickness of the knife plate 44. In this way, a large material saving is achieved with the network hose.

On the side of the sonotrode 38 there is a horizontal groove 52, rounded at the bottom, opposite the cutting edge 46 of the cutter plate 44. The cutting edge 46 projects only so much relative to the toothed pressure surface 39 that it does not yet form the base of the groove 52 during the welding process , at which point the spacing should be as small as possible. It is ensured by the set screw 48 and, if necessary, a fixed stop limiting the feed of the anvil 32. However, if the knife plate 44 wears, it can be easily replaced.

The spatial relationships during the welding process are shown in FIGS. 6A, B, the cross section of the weld being shown enlarged for clarification in FIG. 6B. The zigzag-shaped cross section throttles the displacement of the material softened during the welding process in the lateral direction and promotes the displacement in the vertical direction with respect to the mesh tube 16 in the axial direction. The thickness d indicated in FIG. 7 is substantially greater than the thickness of a mesh thread.

Nevertheless, as already mentioned above, a certain thinning of the material in the very narrow edge areas of the welding zones cannot be prevented during ultrasonic welding. In order to prevent this material thinning from occurring on the load-bearing net threads, a sheath of the gathered net tube at the welding point is to be sheathed according to FIGS. 8 to 10 Foil strip 54 is provided. It is fed axially in the gathering and welding tool according to FIG. 8 A, B from top to bottom, with reference to the net hose 16, whereby according to FIG. 9 it is bent into a U-shaped cross section by guide plates or rollers and by feed rollers is inserted from above into the slot 28 of the gathering part 26. Because the film strip 54 must first be inserted into the slot 28 in such a way that its leg ends, as shown in FIG. 8B, point to the entrance of the slot 28, and only then does the net hose 16, in cooperation with the packer part, be gathered radially by the slider 24 and is pushed into the slot 28, this is widened at its rear area receiving the U-shaped film strip 54 by approximately the thickness of the film strip, so that the threads of the network tube 16 pushed from the slider 24 to the rear end of the slot 28 do not hit the leg ends of the film strip, but are displaced without interference into its U-shaped cross section, as shown in FIG. 8B. If the anvil 32 then moves toward the right against the sonotrode 38 into the welding position with reference to FIG. 8B, it is not the threads of the mesh tube 16 but the legs of the U-shaped film strip 54 on the pressure surfaces 37 and 39 to the system, and accordingly there is only an indentation or thinning of the material in the material of the film strip 54, but not in the mesh threads.

It is expedient, as shown in FIG. 8A, to insert the film strip 54 both between the upper and between the lower pressure surfaces 37, 39. With regard to the weld seam formed between the lower pressure surfaces 37, 39, the film strip represents only an addition of material and a welding aid in order to improve the quality of the weld seam. On the other hand, a longer one hangs on the weld seam formed between the upper pressure surfaces 37, 39 Piece of film strip 54, the z. B. can serve as a label, price tag, wrist strap or the like. The welded-on film strip 54 can end freely after being severed or, at its other end, can be welded tight again during the next welding process, ie at the other end of the net bag formed.

Deviating from the embodiment according to FIGS. 8 and 9, there is also the possibility of horizontally tapping the film strip 54 according to FIG. H. transversely to the hose 16, to be introduced into the gathering tool, wherein it is expediently fed with reference to FIG. 8B in the direction of the slot 28 along one side wall, bends in a U-shape at the rounded end of the slot 28 and then in Top view or in cross section assumes essentially the same position as shown in FIG. 8B. Short sections of the film strip, the length of which just gives the used U-shaped cross section, can be inserted horizontally into the slot either by means of a plunger, in order to serve as a welding aid for improving the quality of the weld seam in the subsequent welding process. However, even in this embodiment of the method, a longer section of the film strip 54 can protrude forward from the slot 28 and this z. B. use as a label.

Finally, with reference to FIG. 8B in comparison to FIG. 1B, it is shown that the front edges of the slide 24 do not necessarily have to be cut into a V-shape, but also z. B. may have a straight shape extending transversely to the direction of movement. In this case, the gathering effect is exerted solely by the inclined edges of the gathering part 26.

In conclusion, it can be stated that the advantages of the gathering and welding tools described above can also be realized in the same way if instead of one A film tube is gathered radially and welded into packaging bags by means of the ultrasonic welding tool described. Even then, the toothing of the pressure surfaces 37, 39, which extends in the axial direction of the hose, reduces the lengthening of the weld seam in the direction transverse to the hose material, the inclusion of the knife 44, 46 in the welding tool permits a substantial simplification of the device and helps Saving packaging material, and the proposed welding of a film strip, preferably made of the same material as the mesh or film tube, overcomes a major deficiency in the ultrasonic welding process, namely the material weakening in the edge region of the welding zone, and makes it possible in a very simple manner To produce pouch packaging which, including the closure and label, consist of only one material. It can also be seen that the application of the abovementioned measures and the advantages achieved thereby are not limited to packaging processes in which the products to be packaged are introduced into the bags from above, since the processes during the welding process are the same , even if the mesh or film tube z. B. is fed horizontally to the ultrasonic welding tool and this executes a vertical or also horizontal closing and opening movement.

Claims

1. A method for portion-wise packaging of objects or bulk goods, in each of which a portion is introduced from above into a net tube (16) closed at the lower end, which is then gathered radially above the portion, closed at two axially adjacent locations and cut through between them, characterized by the fact that the mesh tube (16) is closed by ultrasonic welding and the next portion (14) is already introduced into the mesh tube (16) while the pressure of the welding tool is still being maintained, the welding point is largely relieved of tensile forces exerted by the weight of this portion (14) by temporarily supporting the portion after insertion into the mesh tube and / or temporarily holding the mesh tube between the portion and the welding point.

2. The method according to claim 1, characterized in that the net tube (16) gathered during a lateral displacement and the pressure of the welding tool (32, 38) is directed essentially transversely to the lateral displacement during gathering.

3. The method according to claim 1 or 2, characterized in that after gathering, the next portion (14) at the end of their case falls through the net hose (16) onto a base (24) lying to the side of the weld and at or immediately after the welding process and after the base (24) has been pulled away in a sagging section of the net tube (16) hangs on a deflection edge (at 36) of the closed welding tool (32, 38).

4. The method according to any one of claims 1 to 3, characterized ge indicates that with a single ultrasonic welding tool (32, 38) both adjacent closures of the hose (16) are produced at the same time and this between the closures by a narrow point (46, 52) of the welding tool (32, 38) is severed or provided with a predetermined breaking point.

5. The method according to any one of claims 1 to 4, characterized ge indicates that before the ultrasonic welding process we¬ at least at one closure film material (54) between the tube (16) and the welding tool (32, 38) is inserted.

6. Device for carrying out the method according to one of claims 1 to 5, with at least one vertically or obliquely downwardly oriented filling tube (10), on the outer surface of which an axially gathered net or film tube (16) can be pulled, which is controlled downwards is removable, one below the outlet opening

(20) of the filling pipe (10) arranged gathering tool (24, 26) for the radial constriction of the hose (16), a closing device (32, 38) and a cutting device (35, 44), characterized in that the closing device (32, 38) has an ultrasonic welding tool, above which there is a drop brake (24, 36) for relieving the strain on the welding point in the welding tool by the weight of one from the filling tube (10) into the hose

(16) falling portion (14) is arranged.

7. The device according to claim 6, characterized in that the shirring tool (24, 26) has a substantially horizontally movable slide (24) which from its radially retracted starting position from its opening (20) with its front edge through the outlet opening (20) can be pushed forward into a closed position, and the sonotrode (38) and / or the anvil (32) of the welding tool against the shirred hose (16) in a closed position lying to the side of the vertical projection of the outlet opening (20) Welding position are displaceable, and that the welding tool (32, 38) and / or the gathering tool (24, 26) have a deflection edge (at 36) on which the hose (16) between the closed welding tool (32, 38) and the outlet opening ¬ tion (20) can be deflected with braking effect.

8. The device according to claim 6 or 7, characterized gekennzeich¬ net that the slider (24) cooperates during gathering with a fixed gathering part (26) and at least one of the two gathering tool parts (24, 26) with a V-shaped cut front edge is formed, the slide (24) and the gathering part (26) at different levels, each above the ultrasonic welding tool (32, 38), an upper gathering plate and below the ultrasonic welding tool (32, 38), a lower Raf ¬ fer plate.

9. Device according to one of claims 6 to 8, characterized ge indicates that the slide (24) is controlled such that it can only be retracted into the starting position after insertion of a portion (14) into the tube (16) and in the advanced position forms the drop brake or part of it.

10. The device according to one of claims 6 to 9, characterized ge indicates that the sonotrode (38) and / or the anvil (32) of the welding tool are substantially displaceable transversely to the direction of movement of the slide (24).

11. Device according to one of claims 6 to 10, characterized in that the sonotrode (38) and the anvil (32) of the welding tool (32, 38) with an upper and a lower end pressure surface for producing two closures of the hose arranged side by side (16) is formed.

12. Device according to one of claims 6 to 11, characterized in that the tool part (32) of the ultrasonic welding tool (32, 38) which is displaceable against a fixed tool part (38) and has a deflection member (33) attached above it ) is connected, which has the deflecting edge (at 36) which extends essentially parallel to its direction of movement, at which, after the slide (24) has been withdrawn from the advanced position, the hose (16) between the filling tube

(10) and the pressure surfaces (37, 39) of the welding tool (32, 38).

13. The apparatus according to claim 12, characterized in that the deflecting member (33) is formed with an inclined surface leading to this when the ultrasonic welding tool (32, 38) closes (at 36) of the deflecting edge (at 36).

14. Ultrasonic welding tool for a device according to egg nem of claims 6 to 13, characterized in that on the sonotrode (38) and / or on the anvil (32) between the pressure surfaces (37, 39) for producing the closures of the hose (16) there is a narrow projection (46) which extends at least over the width of the welding point and has a smaller distance from the opposite area (52) of the respective other welding tool part (32, 38) than the pressure surfaces (37 , 39).

15. Welding tool according to claim 14, characterized in that the projection (46) by a on the main body (40) of the anvil (32) detachably attached knife plate (44) is gebil¬ det.

16. Welding tool according to claim 14 or 15, characterized gekenn¬ characterized in that the pressure surfaces (37, 39) of the sonotrode (38) and the anvil (32) with it substantially in

Teeth extending in the longitudinal direction of the hose (16) are formed, which are arranged on a gap on the cooperating, opposing pressure surfaces (37, 39).

17. Welding tool according to one of claims 14 to 16, characterized by a feed device for inserting a film strip (54) between the pressure surfaces (37, 39) of the sonotrode (38) and anvil (32).

18. Bag packaging produced by a method of claims 1 to 5 and / or with a device of claims 6 to 17, characterized in that a film strip (54) is also welded onto at least one welding point on at least one side.