EP3826831B1 - Device and method for producing at least one empty open bag - Google Patents

Device and method for producing at least one empty open bag Download PDF

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Publication number
EP3826831B1
EP3826831B1 EP19748477.7A EP19748477A EP3826831B1 EP 3826831 B1 EP3826831 B1 EP 3826831B1 EP 19748477 A EP19748477 A EP 19748477A EP 3826831 B1 EP3826831 B1 EP 3826831B1
Authority
EP
European Patent Office
Prior art keywords
sack
bag
molding box
negative pressure
transport
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19748477.7A
Other languages
German (de)
French (fr)
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EP3826831A1 (en
Inventor
Willi Vollenkemper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Haver and Boecker OHG
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Haver and Boecker OHG
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Publication date
Application filed by Haver and Boecker OHG filed Critical Haver and Boecker OHG
Publication of EP3826831A1 publication Critical patent/EP3826831A1/en
Application granted granted Critical
Publication of EP3826831B1 publication Critical patent/EP3826831B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/006—Controlling; Regulating; Measuring; Safety measures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/004—Closing bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/261—Folding sheets, blanks or webs involving transversely folding, i.e. along a line perpendicular to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/36—Folding sheets, blanks or webs by continuously feeding them to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/02—Machines characterised by the incorporation of means for making the containers or receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/642—Uniting opposed surfaces or edges; Taping by applying heat or pressure using sealing jaws or sealing dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/645—Making seals transversally to the direction of movement

Definitions

  • the present invention relates to a device for producing at least one open sack or bag from at least one layer of a substantially flexible sack material.
  • a device for producing at least one open sack or bag from at least one layer of a substantially flexible sack material.
  • Such a device comprises at least one molding device with at least one essentially tubular molding box with an upper and a lower end in the contour of the bag to be molded.
  • At least one transport device is provided for transporting the bag material along the molding box and at least one closure device serves to connect the bag material along the molding box to form a tube.
  • at least one closing station is provided for producing a bag bottom, which is arranged below the lower end of the molding box.
  • the present invention also relates to a method for manufacturing a sack with such a device.
  • Sacks that are filled with a bulk material such as cement, high-quality grout or other building materials and that have relatively small weights can also be referred to as bags or small bags.
  • Such sacks are often produced in a device upstream of the device directly before filling.
  • a flat film is passed over a forming shoulder and the flat film is then passed over a forming element and welded to form a tubular film.
  • a bottom suture is placed and a sack of the desired size or height is severed from the tube.
  • a sack or bag produced in this way can then be transported on to a corresponding plant or station for filling with bulk material or filled on site through the molding box.
  • the bulk material to be filled is filled into the divided tube or sack until the desired weight or volume is reached. Then the top seam is sewn in and the sack with the bulk material inside is separated.
  • sacks produced in this way usually have side walls which bulge outwards at least slightly. This is due to the fact that when the sealing jaws are closed to introduce the seam for the bottom of a subsequent sack, air is pressed out of the film tube into the preformed sack. Since this is closed at the bottom by the bottom seam is, an overpressure is created in the sack blank until it is separated from the rest of the film tube.
  • a transfer to a transport box or the sliding of a sack into the transport box cannot always function reliably due to the low dead weight or empty weight.
  • the shape does not correspond to the desired outer contour, especially when the bag is filled with bulk material that is heavily compressed.
  • the resulting overpressure when closing the sealing jaws can lead to the film layers shifting relative to one another or to the formation of folds, which causes poor weld seam quality.
  • the DE24 48 694 A1 discloses a device by means of which a vacuum can be generated in a container made of film material and filled with a powdered material and closed, so that the film lies tightly against the powdered material.
  • the device according to the invention is intended for the production of at least one empty open sack from at least one layer of a substantially flexible sack material.
  • This device comprises at least one molding device with at least one molding box, which is formed essentially in the contour of the bag to be molded and has an upper and a lower end.
  • at least one transport device provided for transporting the bag material along the molding box.
  • the device comprises at least one closing device for connecting the bag material along the molding box to form a tube and at least one closing station for producing a bag bottom, which is arranged below the lower end of the molding box.
  • at least one vacuum device is provided, which is suitable and designed to generate at least a slight vacuum in the hose at least at the lower end of the molding box at least temporarily.
  • the vacuum device is preferably suitable and designed to generate the vacuum before and/or during the production of the bottom of the sack.
  • the substantially flexible bag material is first fed to the molding box, placed around it and transported along the molding box in the transport direction from the upper end to the lower end.
  • the transport device is provided, which is designed in a suitable manner.
  • the transport device comprises at least one conveyor belt, which presses the sack material against the transport box and conveys it along it.
  • the sack material is connected to form a tube by means of the closing device, with the tube then being closed by means of the closing station, as a result of which a sack base is produced.
  • the tube closed at the bottom is then transported further until the closing station produces the sack bottom of the next sack.
  • the closure station has closed to form the bottom of the sack, forming the bottom of the sack will purge the air in the closed tube also pressed in the direction of the preceding sack or the preceding sack bottom.
  • the preceding or lowermost sack is separated, preferably by means of a separating device, and the tube with the inserted sack bottom of the next sack is transported further.
  • a negative pressure is generated in the hose by means of the vacuum device, so that the sack material of the sack that is now to be separated is pulled slightly inward before the sack bottom of the subsequent sack is produced.
  • the negative pressure generated can be a few pascals up to a few hectopascals relative to the ambient pressure.
  • One advantage of this is that while the bottom of the following sack is being manufactured, air is again displaced into the preceding sack which is now to be separated, but this is not inflated now, but is inflated or reshaped back into its normal position. In this way, an optimally shaped sack can be produced in the shape or contour of the molding box when the open sack is separated. This can be optimally transferred to a molding box, since the bag material does not fall or fall out. is exposed to the outside.
  • the shape of the filled sack also corresponds to the shape specified by the molding box.
  • the generation of a slight negative pressure in the first sack when manufacturing the sack bottom of the subsequent sack prevents distortion from occurring as a result of tensions in the sack material, as a result of which the sack bottom or the closing seam would not be manufactured properly.
  • the device according to the invention is suitable for producing open, empty sacks from at least one layer of an essentially flexible sack material.
  • This sack material can be provided, for example, by a film web and/or a paper web, fabric, other materials or mixtures thereof.
  • the use of several layers or only partially multi-layer materials can also be advantageously used.
  • the sack material is made available in particular as endless material, which in particular also means material stored on a roll as a material supply, with these rolls being exchanged or connected as required.
  • the materials of the individual rolls can in particular be connected to form a practically endless material so that the material does not have to be threaded in again.
  • the molding device preferably comprises at least the in particular tubular molding box and at least one molding shoulder.
  • a forming shoulder is to be understood in particular as a component via which the essentially flexible bag material is formed or preformed in such a way that it is suitably fed to the molding box or guided around the molding box.
  • the sack shape or sack contour can be formed around the mold box from a layer of sack material, so that a hose can be inserted into the mold by means of the closure device Basic shape or cross-section of the later open bag is formed.
  • the closure device serves to produce a tube from the layer of bag material placed around the molding box.
  • the closure device is preferably designed in such a way that it connects the currently used bag material in a suitable manner.
  • a welding station can be provided which introduces a longitudinal seam into the bag material, with the film wrapped around the molding box overlapping slightly or at least slightly for this purpose.
  • the closure device can also be designed as a gluing station.
  • a coating or another material can be provided, so that in addition to an adhesive process, another closure option such as welding is also possible.
  • At least one device for forming a gusset and/or at least one device for pressing or pushing in the sack material to produce the sack bottom can also be assigned to the closure station for producing the sack bottom.
  • the sacks produced by means of the device according to the invention are then preferably transferred to a transport box or the like and then transported to a packing plant, in particular a separate one.
  • the sack can preferably be transferred from the transport box into a filling box and then filled in the packing plant.
  • the device according to the invention offers many advantages.
  • a considerable advantage is that, as already described above, the tube made of film material, which is closed at the bottom by the bottom seam, is made of film material before and/or during the production of the bottom of the sack of the following bag is at least slightly pulled inwards.
  • the sack separated after the production of the sack base of the subsequent sack is not inflated during the production of the sack base of the subsequent sack, as a result of which the side walls of the sack to be separated would bulge outwards.
  • the film material does not return to the original shape of the molding box to a satisfactory degree after the sack has been separated.
  • the sack would not slide optimally into a transport box or similar transfer box due to its low weight when it was transferred, which would mean that reliable operation of the system would not be guaranteed.
  • the shape of the sack or the uniform contact of the sack walls with the transfer box would also be different than specified. This is prevented according to the invention.
  • the vacuum device preferably comprises at least one vacuum line and/or at least one piston and/or at least one venturi device or any other type of vacuum generation.
  • a vacuum line or a suction line can be provided, which generates at least a slight vacuum on the underside or on the lower end of the molding box.
  • a piston can also be used, with air being sucked out of the hose or molding box depending on the stroke or setting of the stroke of the piston, so that the bag walls can be easily moved move inward.
  • a valve device can also generate the negative pressure if, for example, an air stream flows past an opening in the molding box and thus draws air out of it via the Venturi effect, whereby a negative pressure can also be generated on the underside of the molding box.
  • the molding box particularly preferably has at least one free flow cross section from the upper end to the lower end, the negative pressure device being connected at the upper end to the free flow cross-section.
  • the upper end is to be understood as meaning an upper section of the molding box on which the bag material is at least not yet completely guided around the molding box. In this way, the vacuum device can be connected to the molding box without interfering with the transport of the bag material along the molding box.
  • the molding box is of tubular design or is produced by bending or forming sheet metal, for example.
  • a hollow mold box is thus provided. If this is essentially closed at the upper end, a negative pressure is generated at the lower end of the mold box when a negative pressure is applied.
  • the free flow cross section and the vacuum device do not form a completely closed system.
  • a deliberate leak, so to speak, which is achieved in particular by the design of the molding box, can ensure that even if there is a permanent negative pressure, no vacuum is drawn in the hose, which is closed at least on one side, which could lead to the hose collapsing or even being pulled in would guide the molding box.
  • At least one suction connection is arranged on the molding box.
  • a suction connection can be provided in particular at the upper end, for example for connection to a suction line or to a hose.
  • the upper end is to be understood in such a way that in this area of the molding box there is still no full-surface encasing of the molding box with bag material.
  • the negative pressure generated by the negative pressure device is preferably adjustable.
  • a valve and/or a throttle and/or a secondary air flap can be provided, which set or by means of which the generation of a negative pressure can be switched on and off.
  • the negative pressure can also be set via a pulse, with the strength of the negative pressure being generated via the pulse length or the vibration of the air flow.
  • At least one transport plunger is arranged at the lower end of the molding box, which can be displaced at least slightly in the direction of transport of the bag material.
  • a transport plunger is in particular designed in such a way that it can be shifted into the transport box at least in sections and continues the contour of the molding box at least in sections.
  • the transport plunger can in particular be of essentially conical design.
  • Such a transport plunger serves in particular to further convey the tube of film material or the bag to be separated afterwards, even if the transport device should no longer have any contact with the bag material in the area of the lower end of the molding box, depending on the design of the device.
  • the transport plunger supports the sliding of the foil during further transport.
  • At least one through opening is provided in the transport plunger.
  • a negative pressure can also be generated in the tube if a transport plunger is provided, which would essentially close the lower end of the molding box from the contour and air can flow into the resulting cavity during further transport.
  • At least one pressure line can preferably also be routed through the molding box.
  • a pressure line is then preferably suitable and designed to generate at least a slight overpressure in the hose or in the hose closed on one side by the bottom of a sack.
  • Such a pressure line serves in particular to transport the bag or to push the film loose during further conveying and/or to straighten the film sliding off the molding box hose.
  • Such a pressure line is passed through the transport plunger, in particular when a transport plunger is used, or a corresponding opening is provided in the transport plunger, through which the pressure line can introduce excess pressure into the tube made of film material. With this pressure line, the inflow of air through the opening in the transport plunger can be additionally supported.
  • At least one separating device is preferably assigned to the closure station.
  • a separating device separates the previously formed sack during or after the manufacture of the sack bottom of a subsequent sack, as a result of which a sack that is open on one side is manufactured.
  • a separating device can be provided, for example, by a fly cutter, which is arranged downstream of the closure station or can also be integrated into the closure station.
  • sliding and/or draw knives can also be used.
  • the previously formed sack can also be thermally separated when the sack bottom of a subsequent sack is produced.
  • a thermowelding jaw can be provided, which is integrated into the closing station or makes the closing station available.
  • This can be shaped in such a way that, at the same time as producing a sack bottom, the sack hanging underneath that has not yet been separated is thermally separated. It must be ensured that the film layers of the open end of the sack produced do not stick to one another as a result of the thermal separation.
  • the method according to the invention is suitable for producing at least one open sack with a device as described above.
  • a device as described above.
  • at least one layer of a substantially flexible bag material in particular as a continuous material, is placed around the molding box in the contour of the bag to be formed.
  • the bag material is connected to a tube by means of the closing device, which is transported further along the molding box.
  • Below the molding box a closure station is arranged, which produces the sack bottom of the sack to be formed.
  • at least a slight negative pressure is generated in the tube made of sack material by means of the negative pressure device.
  • the method according to the invention also offers the advantages that have already been explained above for the device.
  • a finished sack is preferably separated by means of the separating device when producing the sack bottom of the following sack.
  • the transport of the hose is particularly preferably supported by the displacement of at least one transport plunger, which can preferably move in the transport direction and counter to the transport direction.
  • the overpressure device can also or additionally generate at least a slight overpressure in the hose at least temporarily in order to transport the hose further along the molding box or to support the sliding of the film at the end of the molding box.
  • figure 1 shows a perspective overall view of a device 200 for filling bulk materials and fluids into flexible, open-topped sacks 100 figure 1
  • the sacks 100 processed by the device 200 shown consist of a flexible sack material 101 and here of plastic material or foil.
  • the device 200 comprises a device 1 according to the invention for the production of open sacks 100, a transfer device 250, a filling carousel 201 and a compression station, the compression station not being shown in the figures.
  • the device 1 according to the invention for producing sacks 100 makes sacks available which, in the exemplary embodiment shown, fall or slide into a transport box 251 of the transfer device 250 .
  • the transport box 251 then swivels and lets the open sack 100 fall down into the filling box 202 above a filling box 202 .
  • the sack moves on the filling carousel 201 and is being filled at the same time.
  • sack material 101 is guided from a supply 20 around a molding box 3 via a forming shoulder 22, so that the web of sack material 101 overlaps at least slightly.
  • a closure device 7 By means of a closure device 7 , a tube 102 is formed from the bag material 101 placed around the mold box 3 , into which tube a bag base 103 is subsequently introduced by the closure station 8 .
  • an open bag 100 In order for an open bag 100 to slide or fall smoothly into both the transport box 251 and the filling box 202, it must have a predetermined shape or contour. This is ensured with the device according to the invention for the production of open sacks. In addition, it is achieved that the filled sack still has the desired shape even after a possible subsequent compression or even extreme post-compression.
  • FIG. 2 to 6 1 is a purely schematic representation of an exemplary embodiment of a device 1 according to the invention for the production of empty sacks 100 in various views.
  • the device 1 includes in the embodiment shown here in addition to a supply 20 for sack material 101, a deflection system 21, which comprises a plurality of rollers, via which the layer of sack material 101 via a in the Figures 2 to 6 not shown forming shoulder 22 is fed to the mold box 3.
  • a deflection system 21 which comprises a plurality of rollers, via which the layer of sack material 101 via a in the Figures 2 to 6 not shown forming shoulder 22 is fed to the mold box 3.
  • the molding shoulder 22 and the molding box 3 form the molding device 2.
  • the molding box 3 has the contour of the open bag 100 to be produced, with the layer or layers of bag material 101 being suitably fed to the molding box 3 or guided around it via the forming shoulder 22, so that the bag material is in the contour of the sack 100 to be formed can be connected to form a tube 102 by means of a closure device 7 .
  • the bag material 101 laid around the molding box 3 is transported along the molding box 3 by means of a transport device 6 which comprises two belt drives 23 in the exemplary embodiment shown here.
  • the belt drives 23 press the bag material 101 against the molding box 3 and thus transport the bag material 101 or the tube 102 along the transport direction 16 via the molding box 3.
  • the molding box 3 has an upper end 4 and a lower end 5, with a closing station 8 being provided below the lower end 5, which produces a sack 100 or a sack blank from the tube 102 made of sack material 101 by introducing a sack bottom 103. which is separated from the hose 102 by means of a separating device 19 .
  • a vacuum device 9 is provided, which generates at least one vacuum at the lower end 5 of the molding box 3 .
  • FIG 7 an exemplary embodiment of a device 1 according to the invention is shown purely schematically, with only the molding box 3, the closing station 8 and the separating device 19 being shown for a better overview.
  • bag material 101 or a tube 102 that has already been formed from bag material 101 is transported along molding box 3 , which has the contour of later open bag 100 .
  • FIG 7 shows purely schematically what happens when the closure station 8 moves together in order to form a bag bottom 103 . Since the hose 102 with the sack base 103 of the previously manufactured sack 100 is still hanging below the molding box 3, when the closure station 8 is moved together to form the sack base 103 of the subsequent sack 100, air in the hose 102 is also released into the section lying at the bottom in the transport direction 16 of the hose 102 pressed with the bottom 103 of the sack.
  • this section inflates and the sack walls 104 bulge outwards.
  • the excess pressure now prevailing in the bag 100 escapes as soon as the separating device 19, in this case a fly knife 24, has separated the bag 100, which is then open at the top, from the rest of the tube 102.
  • the sack walls 104 do not recover completely or satisfactorily. This has the disadvantage that the sack cannot slide so easily into a transport box 251 arranged underneath and later into the filling box 202 either.
  • a negative pressure is generated at the lower end 5 of the molding box 3 via a free flow cross section 13 within the molding box 3 via a suction connection 14 .
  • the suction connection 14 is provided here at the upper end 4 of the molding box.
  • the upper end 4 does not necessarily mean the uppermost section of the molding box 3, but rather each section of the molding box 3 around which the bag material 101 has not yet been completely folded, so that there is free access to the molding box 3. If necessary, also from above.
  • the negative pressure is provided here via a negative pressure line 10 which is connected to the suction connection 14 .
  • the vacuum device 9 can also include a piston 11 and/or a venturi device 12, for example.
  • the result is that the sack material 101 or the sack material 101 lying on top of one another does not shift against one another when the sack bottom 103 is being produced, so that a properly formed sack bottom 103 or closure seam 105 is produced, for example, in the form of a welded seam and/or glued seam.
  • a transport stamp 15 can be provided at the lower end 5 of the molding box 3 can, which can be moved in the transport direction 16 and counter to the transport direction 16.
  • the transport plunger 15 is of conical design, so that at least part of the transport plunger 15 can be accommodated within the mold box 3 .
  • Another section of the transport plunger 15 continues the outer contour of the mold box 3 here.
  • the outer circumference of the transport plunger 15 is preferably designed to be slightly smaller than the outer circumference of the molding box, so that the film can easily slide over it and is not pulled back with the rearward movement of the transport plunger 15 .
  • the movement of the transport plunger 15 in the transport direction 16 means that the tube 102 formed around the molding box 3 is also transported further when the transport device 6 is no longer in contact with the tube 102 in this area and is thus pushing the bag material 101.
  • the transport plunger 15 makes it easier for the tube 102 to slide off or loosen or set in motion from the molding box 3.
  • figure 9 shown purely schematically that a pressure line 18 can be in operative connection to the lower end 5 of the molding box through the molding box 3 or in another suitable manner.
  • an overpressure can also be generated in the last hose section by means of the pressure line in order to support the transport of the sack 100 or the hose 102 before the sack 100 is separated.
  • FIG 10 a view from below of a transport plunger 15 in a molding box 3 is shown purely schematically. It can be seen here that the transport plunger 15 completely fills the cross section of the molding box 3 so that no negative pressure could be generated through the molding box 3 at the lower end 5 of the molding box 3 .
  • a plurality of through-openings 17 are provided, through which a created by the molding box 3 Negative pressure can also act through the transport plunger 15 at the lower end 5 of the molding box 3, or when the hose 102 is conveyed further, air can flow in.
  • pressure line 18 can also have its own passage opening 17 or is arranged in another passage opening 17, so that a temporary overpressure can be applied in the hose 102 below the molding box 3 through the transport plunger.

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Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Herstellung wenigstens eines offenen Sackes bzw. Beutels aus wenigstens einer Lage eines im Wesentlichen flexiblen Sackmaterials. Dabei umfasst eine solche Vorrichtung wenigstens eine Formeinrichtung mit wenigstens einem im Wesentlichen rohrförmigen Formkasten mit einem oberen und einem unteren Ende in der Kontur des zu formenden Sackes. Es ist wenigstens eine Transporteinrichtung zum Transport des Sackmaterials entlang des Formkastens vorgesehen und wenigstens eine Verschlusseinrichtung dient zum Verbinden des Sackmaterials entlang des Formkastens zu einem Schlauch. Weiterhin ist wenigstens eine Verschlussstation zum Erzeugen eines Sackbodens vorgesehen, welche unterhalb des unteren Endes des Formkastens angeordnet ist. Die vorliegende Erfindung betrifft zudem ein Verfahren zum Herstellen eines Sackes mit einer solchen Vorrichtung.The present invention relates to a device for producing at least one open sack or bag from at least one layer of a substantially flexible sack material. Such a device comprises at least one molding device with at least one essentially tubular molding box with an upper and a lower end in the contour of the bag to be molded. At least one transport device is provided for transporting the bag material along the molding box and at least one closure device serves to connect the bag material along the molding box to form a tube. Furthermore, at least one closing station is provided for producing a bag bottom, which is arranged below the lower end of the molding box. The present invention also relates to a method for manufacturing a sack with such a device.

Säcke, die mit einem Schüttgut wie Zement, hochwertigem Fugenmörtel oder anderen Baustoffen gefüllt sind und die relativ kleine Gewichte aufweisen, können auch als Beutel oder Kleinbeutel bezeichnet werden.Sacks that are filled with a bulk material such as cement, high-quality grout or other building materials and that have relatively small weights can also be referred to as bags or small bags.

Oftmals werden solche Säcke in einer der Vorrichtung vorgeschalteten Einrichtung direkt vor der Füllung hergestellt. Dazu wird beispielsweise eine Flachfolie über eine Formschulter geführt und die Flachfolie dann über ein Formelement geführt und zu einem Folienschlauch verschweißt. In regelmäßigen Abständen wird eine Bodennaht eingebracht und ein Sack mit der gewünschten Größe bzw. Höhe wird von dem Schlauch abgetrennt.Such sacks are often produced in a device upstream of the device directly before filling. For this purpose, for example, a flat film is passed over a forming shoulder and the flat film is then passed over a forming element and welded to form a tubular film. Periodically a bottom suture is placed and a sack of the desired size or height is severed from the tube.

Ein so hergestellter Sack bzw. Beutel kann dann zur Abfüllung von Schüttgut an eine entsprechende Anlage oder Station weitertransportiert oder an Ort und Stelle durch den Formkasten hindurch befüllt werden. In den abgeteilten Schlauch bzw. Sack wird das abzufüllende Schüttgut eingefüllt, bis das gewünschte Gewicht oder Volumen erreicht wird. Dann wird die Kopfnaht eingebracht und der Sack mit dem darin befindlichen Schüttgut abgetrennt.A sack or bag produced in this way can then be transported on to a corresponding plant or station for filling with bulk material or filled on site through the molding box. The bulk material to be filled is filled into the divided tube or sack until the desired weight or volume is reached. Then the top seam is sewn in and the sack with the bulk material inside is separated.

Das der Abfüllung von Schüttgut vorgeschaltete Herstellen eines Sacks aus einer Lage von Sackmaterial wird beispielsweise in der DE 10 2014 113 864 A1 offenbart und funktioniert prinzipiell. Nachteilig ist jedoch, dass die mit bekannten Anlagen hergestellten Säcke nicht immer genau die Form bzw. den Querschnitt aufweisen, welcher eigentlich vorgesehen ist.The filling of bulk material upstream producing a bag from a layer of bag material is, for example, in DE 10 2014 113 864 A1 reveals and works in principle. The disadvantage, however, is that the sacks produced with known systems do not always have the exact shape or cross-section that is actually intended.

Dies passiert dadurch, dass bei dem Beispiel einer Anlage mit Folie zunächst eine Bodennaht in den Folienschlauch eingebracht wird, wodurch ein einseitig geschlossener Folienschlauch entsteht. Der Folienschlauch wird dann weitertransportiert, bis eine gewünschte Sackhöhe erreicht ist. Jetzt wird die Bodennaht des nachfolgenden Sackes in den Folienschlauch eingebracht und der erzeugte Sackformling wird unterhalb dieser Foliennaht von dem Rest des Folienschlauches abgetrennt und beispielsweise in einen Transportkasten gegeben, welcher den jetzt offenen Sack an die Abfüllung weiterreicht.This happens because, in the example of a system with film, a bottom seam is first introduced into the film tube, resulting in a film tube that is closed on one side. The film tube is then transported further until the desired bag height is reached. Now the bottom seam of the following sack is introduced into the film tube and the sack blank produced is separated from the rest of the film tube below this film seam and placed, for example, in a transport box, which passes the now open sack to the filling station.

Derartig hergestellte Säcke weisen jedoch in der Regel wenigstens leicht nach außen ausgebeulte Seitenwände auf. Dies entsteht dadurch, dass bei Schließen der Schweißbacken zum Einbringen der Naht für den Sackboden eines Folgesackes Luft aus dem Folienschlauch in den zuvor hergestellten Sackformling gedrückt wird. Da dieser nach unten hin durch die Bodennaht verschlossen ist, entsteht ein Überdruck in dem Sackformling, bis dieser von dem Rest des Folienschlauches abgetrennt wird.However, sacks produced in this way usually have side walls which bulge outwards at least slightly. This is due to the fact that when the sealing jaws are closed to introduce the seam for the bottom of a subsequent sack, air is pressed out of the film tube into the preformed sack. Since this is closed at the bottom by the bottom seam is, an overpressure is created in the sack blank until it is separated from the rest of the film tube.

Nun entweicht zwar der Druck aus dem jetzt oben offenen Sack, die leicht nach außen gebeulten Seitenwände bewegen sich jedoch nicht in die ursprünglich angedachte und über das Formelement vorgegebene Form zurück.Although the pressure now escapes from the sack, which is now open at the top, the side walls, which are slightly bulged outwards, do not move back into the shape originally intended and specified by the form element.

Dadurch kann eine Übergabe an einen Transportkasten bzw. das Hineingleiten eines Sackes in den Transportkasten nicht immer zuverlässig aufgrund des geringen Eigengewichtes bzw. Leergewichtes funktionieren. Zudem entspricht ist gerade bei einer stark verdichteten Füllung des Sackes mit Schüttgut die Form nicht der gewünschten Außenkontur.As a result, a transfer to a transport box or the sliding of a sack into the transport box cannot always function reliably due to the low dead weight or empty weight. In addition, the shape does not correspond to the desired outer contour, especially when the bag is filled with bulk material that is heavily compressed.

Ebenso kann es durch den entstehenden Überdruck beim Schließen der Schweißbacken insbesondere bei Beuteln mit eingelegten Seitenfalten zu einer Verschiebung der Folienlagen zueinander oder zu einer Faltenbildung führen, was eine schlechte Schweißnahtqualität bewirkt.Likewise, the resulting overpressure when closing the sealing jaws, particularly in the case of bags with inserted side folds, can lead to the film layers shifting relative to one another or to the formation of folds, which causes poor weld seam quality.

Die DE24 48 694 A1 offenbart eine Vorrichtung, mittels welcher in einem mit einem pulverförmigen Material gefüllten und geschlossenen Behälter aus Folienmaterial ein Vakuum erzeugt werden kann, sodass sich die Folie eng an das pulverförmige Material anlegt.the DE24 48 694 A1 discloses a device by means of which a vacuum can be generated in a container made of film material and filled with a powdered material and closed, so that the film lies tightly against the powdered material.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, die zuvor beschriebenen Nachteile bei der Herstellung von offenen Säcken zu verbessern.It is therefore the object of the present invention to improve the disadvantages described above in the production of open-mouth bags.

Diese Aufgabe wird gelöst durch eine Vorrichtung zur Herstellung eines leeren offenen Sackes mit den Merkmalen des Anspruchs 1 und durch ein Verfahren zur Herstellung eines offenen Sackes mit den Merkmalen des Anspruchs 12. Bevorzugte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche. Weitere Vorteile und Merkmale der vorliegenden Erfindungen ergeben sich aus der allgemeinen Beschreibung und der Beschreibung des Ausführungsbeispiels.This object is achieved by a device for producing an empty open sack with the features of claim 1 and by a method for producing an open sack with the features of claim 12. Preferred developments of the invention are the subject matter of the dependent claims. Further advantages and features of the present invention result from the general description and the description of the embodiment.

Die erfindungsgemäße Vorrichtung ist zur Herstellung wenigstens eines leeren offenen Sackes aus wenigstens einer Lage eines im Wesentlichen flexiblen Sackmaterials vorgesehen. Dabei umfasst diese Vorrichtung wenigstens eine Formeinrichtung mit wenigstens einem Formkasten, welcher im Wesentlichen in der Kontur des zu formenden Sackes ausgebildet ist und ein oberes und ein unteres Ende aufweist. Weiterhin ist wenigstens eine Transporteinrichtung zum Transport des Sackmaterials entlang des Formkastens vorgesehen. Zudem umfasst die Vorrichtung wenigstens eine Verschlusseinrichtung zum Verbinden des Sackmaterials entlang des Formkastens zu einem Schlauch und wenigstens eine Verschlussstation zum Erzeugen eines Sackbodens, welche unterhalb des unteren Endes des Formkastens angeordnet ist. Erfindungsgemäß ist wenigstens eine Unterdruckeinrichtung vorgesehen, welche dazu geeignet und ausgebildet ist, wenigstens an dem unteren Ende des Formkastens wenigstens zeitweise wenigstens einen geringfügigen Unterdruck in dem Schlauch zu erzeugen.The device according to the invention is intended for the production of at least one empty open sack from at least one layer of a substantially flexible sack material. This device comprises at least one molding device with at least one molding box, which is formed essentially in the contour of the bag to be molded and has an upper and a lower end. Furthermore, at least one transport device provided for transporting the bag material along the molding box. In addition, the device comprises at least one closing device for connecting the bag material along the molding box to form a tube and at least one closing station for producing a bag bottom, which is arranged below the lower end of the molding box. According to the invention, at least one vacuum device is provided, which is suitable and designed to generate at least a slight vacuum in the hose at least at the lower end of the molding box at least temporarily.

Dabei ist die Unterdruckeinrichtung vorzugsweise dazu geeignet und ausgebildet ist, den Unterdruck vor und/oder während des Erzeugens des Sackbodens zu erzeugen.The vacuum device is preferably suitable and designed to generate the vacuum before and/or during the production of the bottom of the sack.

Mit der erfindungsgemäßen Vorrichtung werden vorzugsweise getaktet oder auch kontinuierlich offene Säcke hergestellt. Dabei wird das im Wesentlichen flexible Sackmaterial zunächst dem Formkasten zugeführt, um diesen herum gelegt und entlang des Formkastens in der Transportrichtung von dem oberen Ende zu dem unteren Ende transportiert. Dazu ist die Transportvorrichtung vorgesehen, welche in einer geeigneten Art und Weise ausgebildet ist. In einer vorteilhaften Ausgestaltung umfasst die Transporteinrichtung wenigstens einen Förderriemen, welcher das Sackmaterial an den Transportkasten drückt und es an diesem entlang fördert.With the device according to the invention, open bags are preferably produced in cycles or also continuously. In this case, the substantially flexible bag material is first fed to the molding box, placed around it and transported along the molding box in the transport direction from the upper end to the lower end. For this purpose, the transport device is provided, which is designed in a suitable manner. In an advantageous embodiment, the transport device comprises at least one conveyor belt, which presses the sack material against the transport box and conveys it along it.

Entlang des Formkastens wird das Sackmaterial mittels der Verschlusseinrichtung zu einem Schlauch verbunden, wobei der Schlauch anschließend mittels der Verschlussstation verschlossen wird, wodurch ein Sackboden hergestellt wird.Along the molding box, the sack material is connected to form a tube by means of the closing device, with the tube then being closed by means of the closing station, as a result of which a sack base is produced.

Der unten geschlossene Schlauch wird dann weitertransportiert, bis die Verschlussstation den Sackboden des Folgesackes herstellt. Sobald die Verschlussstation sich geschlossen hat, um den Sackboden herzustellen, wird durch das Herstellen des Sackbodens die in dem geschlossenen Schlauch befindliche Luft auch in Richtung des vorhergehenden Sackes bzw. des vorhergehenden Sackbodens gedrückt.The tube closed at the bottom is then transported further until the closing station produces the sack bottom of the next sack. Once the closure station has closed to form the bottom of the sack, forming the bottom of the sack will purge the air in the closed tube also pressed in the direction of the preceding sack or the preceding sack bottom.

Nachdem der Sackboden des Folgesackes hergestellt ist, wird vorzugsweise mittels einer Trenneinrichtung der vorhergehende bzw. unterste Sack abgetrennt und abtransportiert der Schlauch mit dem eingebrachten Sackboden des Folgesackes weitertransportiert.After the sack bottom of the next sack has been produced, the preceding or lowermost sack is separated, preferably by means of a separating device, and the tube with the inserted sack bottom of the next sack is transported further.

Da Luft auch in den vorhergehenden Sack verdrängt wird, wird dieser beim Erzeugen des Folgesackes bzw. beim Erstellen des Sackbodens des Folgesackes geringfügig aufgebläht. Dieser in dem Sack entstehende Überdruck kann zwar beim Abtrennen des fertigen offenen Sackes wieder entweichen, jedoch stellen sich die Sackwandungen nicht unbedingt zurück, sondern verbleiben in der aufgeblähten Stellung, wobei die Seitenwände des Sackes leicht nach außen gedrückt sind. Dies ist nachteilig beispielsweise bei der Übergabe an einen Transportkasten. Auch die Kontur des gefüllten Sackes entspricht dann nicht der vorgegebenen bzw. gewünschten Form.Since air is also displaced into the preceding bag, it is slightly inflated when the next bag is created or when the bottom of the next bag is made. Although this overpressure created in the sack can escape again when the finished open sack is separated, the sack walls do not necessarily recede but remain in the inflated position, with the side walls of the sack being pushed slightly outwards. This is disadvantageous, for example, when handing over to a transport box. The contour of the filled sack then also does not correspond to the specified or desired shape.

Daher wird insbesondere vor und/oder während des Erstellens des Sackbodens eines Folgesackes mittels der Unterdruckeinrichtung ein Unterdruck in dem Schlauch erzeugt, sodass das Sackmaterial des nun abzutrennen Sackes vor dem Herstellen des Sackbodens des Folgesackes leicht nach innen gezogen wird. Je nach Materialstärke und Materialsteifigkeit kann der erzeugte Unterdruck relativ gegenüber dem Umgebungsdruck wenige Pascal bis hin zu einigen Hectopascal betragen.Therefore, in particular before and/or during the creation of the sack bottom of a subsequent sack, a negative pressure is generated in the hose by means of the vacuum device, so that the sack material of the sack that is now to be separated is pulled slightly inward before the sack bottom of the subsequent sack is produced. Depending on the thickness and stiffness of the material, the negative pressure generated can be a few pascals up to a few hectopascals relative to the ambient pressure.

Ein Vorteil hierbei ist, dass zwar beim Herstellen des Sackbodens des nachfolgenden Sackes auch wieder Luft in den vorhergehenden und nun abzutrennen Sack verdrängt wird, dieser jetzt aber nicht aufgebläht, sondern in seine Normalstellung zurückgebläht bzw. zurückgeformt wird. So kann ein optimal geformter Sack in der Form bzw. der Kontur des Formkastens beim Abtrennen des offenen Sackes hergestellt wird. Dieser kann optimal an einen Formkasten übergeben werden, da das Sackmaterial nicht nach außen fällt bzw. nach außen ausgestellt ist. Auch die Form des gefüllten Sackes entspricht der über den Formkasten vorgegebenen Form.One advantage of this is that while the bottom of the following sack is being manufactured, air is again displaced into the preceding sack which is now to be separated, but this is not inflated now, but is inflated or reshaped back into its normal position. In this way, an optimally shaped sack can be produced in the shape or contour of the molding box when the open sack is separated. This can be optimally transferred to a molding box, since the bag material does not fall or fall out. is exposed to the outside. The shape of the filled sack also corresponds to the shape specified by the molding box.

Zudem wird durch das Erzeugen eines leichten Unterdrucks in dem ersten Sack beim Herstellen des Sackbodens des Folgesackes verhindert, dass sich durch entstehende Spannungen in dem Sackmaterial ein Verzug einstellt, wodurch der Sackboden bzw. die Verschlussnaht nicht einwandfrei gefertigt werden würde.In addition, the generation of a slight negative pressure in the first sack when manufacturing the sack bottom of the subsequent sack prevents distortion from occurring as a result of tensions in the sack material, as a result of which the sack bottom or the closing seam would not be manufactured properly.

Die erfindungsgemäße Vorrichtung eignet sich zur Herstellung von offenen leeren Säcken aus wenigstens einer Lage eines im Wesentlichen flexiblen Sackmaterials. Dabei kann dieses Sackmaterial beispielsweise durch eine Folienbahn und/oder eine Papierbahn, Gewebe, anderen Materialien oder Gemische davon bereitgestellt werden. Auch die Verwendung von mehreren Lagen oder auch nur teilweise mehrlagigen Materialien kann vorteilhaft eingesetzt bzw. verwendet werden.The device according to the invention is suitable for producing open, empty sacks from at least one layer of an essentially flexible sack material. This sack material can be provided, for example, by a film web and/or a paper web, fabric, other materials or mixtures thereof. The use of several layers or only partially multi-layer materials can also be advantageously used.

Dabei wird das Sackmaterial insbesondere als Endlosmaterial zur Verfügung gestellt, worunter insbesondere auch auf einer Rolle bevorratetes Material als Materialvorrat verstanden wird, wobei diese Rollen bei Bedarf ausgetauscht bzw. verbunden werden. Dabei können die Materialien der einzelnen Rollen insbesondere zu einem praktisch endlosen Material verbunden werden, sodass ein neues Einfädeln des Materials nicht notwendig ist.. Dann kann das Sackmaterial beispielsweise von diesem Materialvorrat der Formeinrichtung bzw. dem Formkasten zugeführt werden.The sack material is made available in particular as endless material, which in particular also means material stored on a roll as a material supply, with these rolls being exchanged or connected as required. The materials of the individual rolls can in particular be connected to form a practically endless material so that the material does not have to be threaded in again.

Die Formeinrichtung umfasst vorzugsweise wenigstens den insbesondere rohrförmigen Formkasten und wenigstens eine Formschulter. Dabei ist unter einer Formschulter insbesondere ein Bauteil zu verstehen, über welches das im Wesentlichen flexible Sackmaterial derart umgeformt bzw. vorgeformt wird, dass es in geeigneter Weise dem Formkasten zugeführt bzw. um den Formkasten herum geführt wird. So kann aus einer Lage von Sackmaterial die Sackform bzw. Sackkontur um den Formkasten herum gebildet werden, sodass mittels der Verschlusseinrichtung ein Schlauch in der Grundform bzw. Querschnitt des späteren offenen Sackes gebildet wird.The molding device preferably comprises at least the in particular tubular molding box and at least one molding shoulder. A forming shoulder is to be understood in particular as a component via which the essentially flexible bag material is formed or preformed in such a way that it is suitably fed to the molding box or guided around the molding box. Thus, the sack shape or sack contour can be formed around the mold box from a layer of sack material, so that a hose can be inserted into the mold by means of the closure device Basic shape or cross-section of the later open bag is formed.

Die Verschlusseinrichtung dient erfindungsgemäß dazu, aus der um den Formkasten gelegten Lage von Sackmaterial einen Schlauch herzustellen. Dabei ist die Verschlusseinrichtung vorzugsweise derart ausgebildet, dass sie das aktuell verwendete Sackmaterial in geeigneter Art und Weise verbindet. Dabei kann insbesondere bei der Verwendung von Folie eine Schweißstation vorgesehen sein, welche eine Längsnaht in das Sackmaterial einbringt, wobei hierzu die um den Formkasten herumgelegte Folie sich leicht bzw. wenigstens geringfügig überlappt. Bei der Verwendung von Papier als Sackmaterial kann die Verschlusseinrichtung auch als Klebestation ausgebildet sein. Jedoch kann beispielsweise auch bei der Verwendung von Papier im Bereich der Überlappung zum Verbinden der Lage von Sackmaterial zu einem Schlauch eine Beschichtung oder ein weiteres Material vorgesehen sein, sodass neben einem Klebeprozess auch eine andere Verschlussmöglichkeit wie beispielsweise ein Verschweißen ermöglicht wird.According to the invention, the closure device serves to produce a tube from the layer of bag material placed around the molding box. The closure device is preferably designed in such a way that it connects the currently used bag material in a suitable manner. In particular when using film, a welding station can be provided which introduces a longitudinal seam into the bag material, with the film wrapped around the molding box overlapping slightly or at least slightly for this purpose. If paper is used as the bag material, the closure device can also be designed as a gluing station. However, for example, when using paper in the area of the overlap to connect the layer of bag material to form a tube, a coating or another material can be provided, so that in addition to an adhesive process, another closure option such as welding is also possible.

Je nach Ausgestaltung des herzustellenden offenen Sackes kann insbesondere der Verschlussstation zum Erzeugen des Sackbodens auch wenigstens eine Einrichtung zum Formen einer Seitenfalte und/oder wenigstens eine Einrichtung zum Eindrücken bzw. Einschieben des Sackmaterials zum Erzeugen des Sackbodens zugeordnet sein.Depending on the design of the open sack to be produced, at least one device for forming a gusset and/or at least one device for pressing or pushing in the sack material to produce the sack bottom can also be assigned to the closure station for producing the sack bottom.

Die mittels der erfindungsgemäßen Vorrichtung hergestellten Säcke werden dann vorzugsweise in einen Transportkasten oder dergleichen überführt und anschließend zu einer insbesondere separaten Packanlage transportiert. Hier kann der Sack vorzugsweise von dem Transportkasten in einen Füllkasten überführt und anschließend in der Packanlage gefüllt werden.The sacks produced by means of the device according to the invention are then preferably transferred to a transport box or the like and then transported to a packing plant, in particular a separate one. Here the sack can preferably be transferred from the transport box into a filling box and then filled in the packing plant.

Die erfindungsgemäße Vorrichtung bietet viele Vorteile. Ein erheblicher Vorteil ist, dass wie zuvor schon beschrieben der durch die Bodennaht nach unten hin verschlossene Schlauch aus Folienmaterial vor und/oder während des Erzeugens des Sackbodens des nachfolgenden Sackes wenigstens geringfügig nach innen gezogen wird. So wird der nach dem Herstellen des Sackbodens des Folgesackes abgetrennte Sack beim Herstellen des Sackbodens des Folgesackes nicht aufgebläht, wodurch sich die Seitenwandungen des abzutrennen Sackes nach außen aufblähen würden.The device according to the invention offers many advantages. A considerable advantage is that, as already described above, the tube made of film material, which is closed at the bottom by the bottom seam, is made of film material before and/or during the production of the bottom of the sack of the following bag is at least slightly pulled inwards. Thus, the sack separated after the production of the sack base of the subsequent sack is not inflated during the production of the sack base of the subsequent sack, as a result of which the side walls of the sack to be separated would bulge outwards.

Ein Zurückstellen des Folienmaterials nach dem Abtrennen des Sackes in die ursprüngliche Form des Formkastens ergibt sich in der Regel nämlich nicht in einem zufriedenstellenden Maße. Dadurch würde der Sack bei der Übergabe an einen Transportkasten oder dergleichen Übergabekasten aufgrund des geringen Eigengewichtes nicht optimal in diesen hineingleiten, wodurch ein zuverlässiger Betrieb der Anlage nicht gewährleistet wäre. Auch die Sackform bzw. die gleichmäßige Anlage der Sackwandungen an den Übergabekasten wäre anders als vorgegeben. Dies wird erfindungsgemäß verhindert.This is because, as a rule, the film material does not return to the original shape of the molding box to a satisfactory degree after the sack has been separated. As a result, the sack would not slide optimally into a transport box or similar transfer box due to its low weight when it was transferred, which would mean that reliable operation of the system would not be guaranteed. The shape of the sack or the uniform contact of the sack walls with the transfer box would also be different than specified. This is prevented according to the invention.

Bevorzugt umfasst die Unterdruckeinrichtung wenigstens eine Unterdruckleitung und/oder wenigstens einen Kolben und/oder wenigstens eine Venturieinrichtung oder eine beliebig anders geartete Unterdruckerzeugung. So kann beispielsweise eine Unterdruckleitung bzw. eine Saugleitung vorgesehen sein, welche an der Unterseite bzw. an dem unteren Ende des Formkastens einen wenigstens geringfügigen Unterdruck erzeugt. Dies ist insbesondere bei einem nicht vollständig abgeschlossenen System vorteilhaft, insbesondere bei einem strömungstechnisch abgeschlossenes System kann auch ein Kolben verwendet werden, wobei je nach Hub bzw. Einstellung des Hubes des Kolbens Luft aus dem Schlauch bzw. Formkasten gesaugt wird, sodass die Sackwandungen sich leicht nach innen bewegen. Auch eine Ventileinrichtung kann den Unterdruck erzeugen, wenn beispielsweise ein Luftstrom an einer Öffnung des Formkastens vorbeiströmt und so über den Venturieffekt Luft aus diesem herauszieht, wodurch auch so an der Unterseite des Formkastens ein Unterdruck erzeugt werden kann.The vacuum device preferably comprises at least one vacuum line and/or at least one piston and/or at least one venturi device or any other type of vacuum generation. For example, a vacuum line or a suction line can be provided, which generates at least a slight vacuum on the underside or on the lower end of the molding box. This is particularly advantageous in a system that is not completely closed, in particular in a fluidically closed system, a piston can also be used, with air being sucked out of the hose or molding box depending on the stroke or setting of the stroke of the piston, so that the bag walls can be easily moved move inward. A valve device can also generate the negative pressure if, for example, an air stream flows past an opening in the molding box and thus draws air out of it via the Venturi effect, whereby a negative pressure can also be generated on the underside of the molding box.

Besonders bevorzugt weist der Formkasten wenigstens einen freien Strömungsquerschnitt von dem oberen Ende zu dem unteren Ende auf, wobei die Unterdruckeinrichtung an dem oberen Ende mit dem freien Strömungsquerschnitt verbunden ist. Dabei ist unter dem oberen Ende konstruktionsbedingt ein oberer Abschnitt des Formkastens zu verstehen, an welchem das Sackmaterial wenigstens noch nicht vollflächig um den Formkasten herum geführt wird. So kann die Unterdruckeinrichtung an den Formkasten angeschlossen werden, ohne den Transport des Sackmaterials entlang des Formkastens zu stören.The molding box particularly preferably has at least one free flow cross section from the upper end to the lower end, the negative pressure device being connected at the upper end to the free flow cross-section. Due to the design, the upper end is to be understood as meaning an upper section of the molding box on which the bag material is at least not yet completely guided around the molding box. In this way, the vacuum device can be connected to the molding box without interfering with the transport of the bag material along the molding box.

In zweckmäßigen Ausgestaltungen ist der Formkasten rohrartig ausgebildet bzw. durch das Umbiegen bzw. Umformen beispielsweise eines Bleches hergestellt. So wird ein hohler Formkasten zur Verfügung gestellt. Ist dieser am oberen Ende im Wesentlichen verschlossen, wird beim Anlegen eines Unterdrucks ein Unterdruck an dem unteren Ende des Formkastens erzeugt.In expedient configurations, the molding box is of tubular design or is produced by bending or forming sheet metal, for example. A hollow mold box is thus provided. If this is essentially closed at the upper end, a negative pressure is generated at the lower end of the mold box when a negative pressure is applied.

In bevorzugten Ausgestaltungen bilden der freie Strömungsquerschnitt und die Unterdruckeinrichtung kein vollständig geschlossenes System. Durch eine sozusagen gewollte Undichtigkeit, welche insbesondere durch die Ausgestaltung des Formkastens erreicht wird, kann gewährleistet werden, dass auch bei einem dauerhaft anliegenden Unterdruck kein Vakuum in dem wenigstens einseitig geschlossenen Schlauch gezogen wird, was zu einem Kollabieren des Schlauches oder gar Einziehen des Schlauches in den Formkasten führen würde.In preferred configurations, the free flow cross section and the vacuum device do not form a completely closed system. A deliberate leak, so to speak, which is achieved in particular by the design of the molding box, can ensure that even if there is a permanent negative pressure, no vacuum is drawn in the hose, which is closed at least on one side, which could lead to the hose collapsing or even being pulled in would guide the molding box.

In zweckmäßigen Ausgestaltungen ist wenigstens ein Sauganschluss an dem Formkasten angeordnet. Ein solcher Sauganschluss kann insbesondere an dem oberen Ende beispielsweise zum Anschluss an eine Saugleitung bzw. an einen Schlauch vorgesehen sein. Dabei ist auch hier wieder das obere Ende derart zu verstehen, dass in diesem Bereich des Formkastens noch keine vollflächige Ummantelung des Formkastens mit Sackmaterial besteht.In expedient configurations, at least one suction connection is arranged on the molding box. Such a suction connection can be provided in particular at the upper end, for example for connection to a suction line or to a hose. Here, too, the upper end is to be understood in such a way that in this area of the molding box there is still no full-surface encasing of the molding box with bag material.

Bevorzugt ist der von der Unterdruckeinrichtung erzeugte Unterdruck einstellbar. Dazu kann beispielsweise ein Ventil und/oder eine Drossel und/oder eine Falschluftklappe vorgesehen sein, welche die Stärke des erzeugten Unterdrucks einstellen oder mittels welcher das Erzeugen eines Unterdrucks an- und ausgestellt werden kann. Auch über einen Impuls kann der Unterdruck eingestellt werden, wobei die Stärke des Unterdrucks hierbei über die Impulslänge bzw. das Vibrieren des Luftstromes erzeugt wird.The negative pressure generated by the negative pressure device is preferably adjustable. For this purpose, for example, a valve and/or a throttle and/or a secondary air flap can be provided, which set or by means of which the generation of a negative pressure can be switched on and off. The negative pressure can also be set via a pulse, with the strength of the negative pressure being generated via the pulse length or the vibration of the air flow.

Besonders bevorzugt ist an dem unteren Ende des Formkastens wenigstens ein Transportstempel angeordnet, welcher in Transportrichtung des Sackmaterials wenigstens geringfügig verlagerbar ist. Dabei ist ein solcher Transportstempel insbesondere derart ausgebildet, dass er wenigstens abschnittsweise in den Transportkasten verlagert werden kann und wenigstes abschnittsweise die Kontur des Formkastens fortsetzt. Dazu kann der Transportstempel insbesondere im Wesentlichen konisch ausgebildet sein. Ein solcher Transportstempel dient insbesondere dazu, den Schlauch aus Folienmaterial bzw. den anschließend abzutrennen Sack weiter zu fördern, auch wenn die Transporteinrichtung je nach Konstruktion der Vorrichtung keinen Kontakt mehr zu dem Sackmaterial im Bereich des unteren Endes des Formkastens haben sollte. Dabei unterstützt der Transportstempel das Losschieben der Folie beim Weiterfördern.Particularly preferably, at least one transport plunger is arranged at the lower end of the molding box, which can be displaced at least slightly in the direction of transport of the bag material. Such a transport plunger is in particular designed in such a way that it can be shifted into the transport box at least in sections and continues the contour of the molding box at least in sections. For this purpose, the transport plunger can in particular be of essentially conical design. Such a transport plunger serves in particular to further convey the tube of film material or the bag to be separated afterwards, even if the transport device should no longer have any contact with the bag material in the area of the lower end of the molding box, depending on the design of the device. The transport plunger supports the sliding of the foil during further transport.

In zweckmäßigen Ausgestaltungen ist in dem Transportstempel wenigstens eine Durchgangsöffnung vorgesehen. Durch eine solche Ausgestaltung wird erreicht, dass auch ein Unterdruck in dem Schlauch erzeugt werden kann, wenn ein Transportstempel vorgesehen ist, welcher von der Kontur das untere Ende des Formkastens im Wesentlichen verschließen würde und beim Weiterfördern Luft in den entstehenden Hohlraum nachströmen kann.In expedient configurations, at least one through opening is provided in the transport plunger. Such a configuration means that a negative pressure can also be generated in the tube if a transport plunger is provided, which would essentially close the lower end of the molding box from the contour and air can flow into the resulting cavity during further transport.

Durch den Formkasten kann bevorzugt auch wenigstens eine Druckleitung geführt sein. Eine solche Druckleitung ist dann vorzugsweise dazu geeignet und ausgebildet, in dem Schlauch bzw. in dem durch den Sackboden eines Sackes einseitig geschlossenen Schlauches wenigstes einen geringfügigen Überdruck zu erzeugen. Dabei dient eine derartige Druckleitung insbesondere zum Sacktransport bzw. zum Losschieben der Folie beim Weiterfördern und/oder zum Geradeziehen des von dem Formkasten abgleitenden Schlauches. Dabei ist eine derartige Druckleitung insbesondere bei der Verwendung eines Transportstempels durch den Transportstempel hindurchgeführt bzw. in dem Transportstempel ist eine korrespondierende Öffnung vorgesehen, durch welche die Druckleitung einen Überdruck in den Schlauch aus Folienmaterial einbringen kann. Mit dieser Druckleitung kann das Nachströmen der Luft durch die Öffnung im Transportstempel zusätzlich unterstützt werden.At least one pressure line can preferably also be routed through the molding box. Such a pressure line is then preferably suitable and designed to generate at least a slight overpressure in the hose or in the hose closed on one side by the bottom of a sack. Such a pressure line serves in particular to transport the bag or to push the film loose during further conveying and/or to straighten the film sliding off the molding box hose. Such a pressure line is passed through the transport plunger, in particular when a transport plunger is used, or a corresponding opening is provided in the transport plunger, through which the pressure line can introduce excess pressure into the tube made of film material. With this pressure line, the inflow of air through the opening in the transport plunger can be additionally supported.

Bevorzugt ist der Verschlussstation wenigstens eine Trenneinrichtung zugeordnet. Eine solche Trenneinrichtung trennt beim oder nach dem Herstellen des Sackbodens eines nachfolgenden Sackes den zuvor geformten Sack ab, wodurch ein einseitig geöffneter Sack hergestellt wird. Eine solche Trenneinrichtung kann beispielsweise durch ein Schlagmesser zu Verfügung gestellt werden, welches der Verschlussstation nachfolgend angeordnet ist oder auch in die Verschlussstation integriert sein kann. Es können je nach Ausgestaltung auch Schiebe- und/oder Zugmesser verwendet werden. Insbesondere bei der Verwendung von Folie als Sackmaterial kann der zuvor geformte Sack beim Herstellen des Sackbodens eines nachfolgenden Sackes auch thermisch abgetrennt werden. Dazu kann beispielsweise eine Thermoschweißbacke vorgesehen sein, welche in die Verschlussstation integriert ist bzw. die Verschlussstation zur Verfügung stellt. Diese kann so geformt sein, dass gleichzeitig zum Herstellen eines Sackbodens der darunter hängende noch nicht abgetrennte Sack thermisch abgetrennt wird. Wobei sichergestellt sein muss, dass durch das thermische Abtrennen nicht die Folienlagen des oben offenen Endes des erzeugten Sackes aneinander heften.At least one separating device is preferably assigned to the closure station. Such a separating device separates the previously formed sack during or after the manufacture of the sack bottom of a subsequent sack, as a result of which a sack that is open on one side is manufactured. Such a separating device can be provided, for example, by a fly cutter, which is arranged downstream of the closure station or can also be integrated into the closure station. Depending on the configuration, sliding and/or draw knives can also be used. In particular when foil is used as the sack material, the previously formed sack can also be thermally separated when the sack bottom of a subsequent sack is produced. For this purpose, for example, a thermowelding jaw can be provided, which is integrated into the closing station or makes the closing station available. This can be shaped in such a way that, at the same time as producing a sack bottom, the sack hanging underneath that has not yet been separated is thermally separated. It must be ensured that the film layers of the open end of the sack produced do not stick to one another as a result of the thermal separation.

Das erfindungsgemäße Verfahren eignet sich zur Herstellung wenigstens eines offenen Sackes mit einer Vorrichtung, wie sie zuvor beschrieben wurde. Dabei wird wenigstens eine Lage eines im Wesentlichen flexiblen Sackmaterials insbesondere als Endlosmaterial um den Formkasten in der Kontur des zu formenden Sackes gelegt. Mittels der Verschlusseinrichtung wird das Sackmaterial zu einem Schlauch verbunden, welche entlang des Formkastens weitertransportiert wird. Unterhalb des Formkastens ist eine Verschlussstation angeordnet, welche den Sackboden des zu formenden Sackes herstellt. Erfindungsgemäß wird wenigstens vor und/oder während der Herstellung des Sackbodens eines Folgesackes wenigstens ein geringfügiger Unterdruck in dem Schlauch aus Sackmaterial mittels der Unterdruckeinrichtung erzeugt.The method according to the invention is suitable for producing at least one open sack with a device as described above. In this case, at least one layer of a substantially flexible bag material, in particular as a continuous material, is placed around the molding box in the contour of the bag to be formed. The bag material is connected to a tube by means of the closing device, which is transported further along the molding box. Below the molding box a closure station is arranged, which produces the sack bottom of the sack to be formed. According to the invention, at least before and/or during the manufacture of the sack bottom of a subsequent sack, at least a slight negative pressure is generated in the tube made of sack material by means of the negative pressure device.

Auch das erfindungsgemäße Verfahren bietet die Vorteile, wie sie zuvor schon zu der Vorrichtung ausgeführt wurden.The method according to the invention also offers the advantages that have already been explained above for the device.

Bevorzugt wird ein fertiggestellter Sack beim Erzeugen des Sackbodens des nachfolgenden Sackes mittels der Trenneinrichtung abgetrennt.A finished sack is preferably separated by means of the separating device when producing the sack bottom of the following sack.

Besonders bevorzugt wird der Transport des Schlauches durch das Verlagern wenigstens eines Transportstempel unterstützt, wobei dieser sich vorzugsweise in Transportrichtung und entgegen der Transportrichtung bewegen kann.The transport of the hose is particularly preferably supported by the displacement of at least one transport plunger, which can preferably move in the transport direction and counter to the transport direction.

In zweckmäßigen Ausgestaltungen kann auch oder zusätzlich mittels der Überdruckeinrichtung wenigstens zeitweise wenigstes ein geringfügiger Überdruck in dem Schlauch erzeugt werden, um den Schlauch entlang des Formkastens weiter zu transportieren bzw. das Losschieben der Folie am Ende des Formkastens zu unterstützen.In expedient configurations, the overpressure device can also or additionally generate at least a slight overpressure in the hose at least temporarily in order to transport the hose further along the molding box or to support the sliding of the film at the end of the molding box.

Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus dem Ausführungsbeispiel, welches im Folgenden mit Bezug auf die beiliegenden Figuren erläutert wird.Further advantages and features of the present invention result from the exemplary embodiment, which is explained below with reference to the enclosed figures.

In den Figuren zeigen:

Fig. 1
eine perspektivische Gesamtansicht einer Füllvorrichtung für Schüttgüter mit einer vorgeschalteten erfindungsgemäßen Vorrichtung zur Herstellung eines Sackes in einer rein schematischen Darstellung;
Fig. 2
eine rein schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Herstellung eines offenen Sackes in einer perspektivischen Ansicht;
Fig. 3
eine rein schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Herstellung eines offenen Sackes in einer Frontansicht (teilweise sind Bauteile zur besseren Verdeutlichung weggelassen);
Fig. 4
eine Vergrößerung des markierten Bereichs in Figur 3;
Fig. 5
eine rein schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Herstellung eines offenen Sackes in einer Seitenansicht;
Fig. 6
die Ansicht gemäß Figur 5, wobei teilweise Bauteile zur besseren Verdeutlichung weggelassen sind;
Fig. 7
eine rein schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Herstellung eines offenen Sackes in einer Seitenansicht;
Fig. 8
eine rein schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Herstellung eines offenen Sackes in einer Seitenansicht;
Fig. 9
eine rein schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Herstellung eines offenen Sackes in einer Seitenansicht; und
Fig. 10
eine rein schematische Ansicht von unten auf einen Transportstempel in einem Formkasten.
In the figures show:
1
a perspective overall view of a filling device for bulk materials with an upstream device according to the invention for the production of a sack in a purely schematic representation;
2
a purely schematic representation of an embodiment of a device according to the invention for the production of an open sack in a perspective view;
3
a purely schematic representation of an embodiment of a device according to the invention for producing an open sack in a front view (some components have been omitted for better clarity);
4
an enlargement of the marked area in figure 3 ;
figure 5
a purely schematic representation of an embodiment of a device according to the invention for the production of an open sack in a side view;
6
according to the view figure 5 , wherein some components are omitted for clarity;
Figure 7
a purely schematic representation of an embodiment of a device according to the invention for the production of an open sack in a side view;
8
a purely schematic representation of an embodiment of a device according to the invention for the production of an open sack in a side view;
9
a purely schematic representation of an embodiment of a device according to the invention for the production of an open sack in a side view; and
10
a purely schematic view from below of a transport plunger in a molding box.

Figur 1 zeigt eine perspektivische Gesamtansicht einer Vorrichtung 200 zur Abfüllung von Schüttgütern und Fluiden in flexible oben offene Säcke 100. Die an der in Figur 1 dargestellten Vorrichtung 200 verarbeiteten Säcke 100 bestehen aus einem flexiblen Sackmaterial 101 und hier aus Kunststoffmaterial bzw. Folie. figure 1 shows a perspective overall view of a device 200 for filling bulk materials and fluids into flexible, open-topped sacks 100 figure 1 The sacks 100 processed by the device 200 shown consist of a flexible sack material 101 and here of plastic material or foil.

Die Vorrichtung 200 umfasst in dem gezeigten Ausführungsbeispiel eine erfindungsgemäße Vorrichtung 1 zur Herstellung von offenen Säcken 100, eine Übergabeeinrichtung 250, ein Füllkarussell 201 und eine Verdichtungsstation, wobei die Verdichtungsstation in den Figuren nicht dargestellt ist.In the exemplary embodiment shown, the device 200 comprises a device 1 according to the invention for the production of open sacks 100, a transfer device 250, a filling carousel 201 and a compression station, the compression station not being shown in the figures.

Die erfindungsgemäße Vorrichtung 1 zur Herstellung von Säcken 100 stellt Säcke zur Verfügung, welche in dem gezeigten Ausführungsbeispiel in einen Transportkasten 251 der Übergabeeinrichtung 250 fallen bzw. gleiten. Der Transportkasten 251 verschwenkt dann und lässt oberhalb eines Füllkastens 202 den offenen Sack 100 nach unten in den Füllkasten 202 fallen. In dem Füllkasten 202 verfährt der Sack auf dem Füllkarussell 201 und wird währenddessen gefüllt.The device 1 according to the invention for producing sacks 100 makes sacks available which, in the exemplary embodiment shown, fall or slide into a transport box 251 of the transfer device 250 . The transport box 251 then swivels and lets the open sack 100 fall down into the filling box 202 above a filling box 202 . In the filling box 202, the sack moves on the filling carousel 201 and is being filled at the same time.

Zum Herstellen von Säcken 100 wird Sackmaterial 101 von einem Vorrat 20 über eine Formschulter 22 um einen Formkasten 3 herumgeführt, sodass sich die Bahn aus Sackmaterial 101 wenigstens geringfügig überlappt. Mittels einer Verschlusseinrichtung 7 wird aus dem um den Formkasten 3 herumgelegten Sackmaterial 101 ein Schlauch 102 gebildet, in welchen nachfolgend von der Verschlussstation 8 ein Sackboden 103 eingebracht wird.To produce sacks 100, sack material 101 is guided from a supply 20 around a molding box 3 via a forming shoulder 22, so that the web of sack material 101 overlaps at least slightly. By means of a closure device 7 , a tube 102 is formed from the bag material 101 placed around the mold box 3 , into which tube a bag base 103 is subsequently introduced by the closure station 8 .

Damit ein offener Sack 100 problemlos sowohl in den Transportkasten 251 und in den Füllkasten 202 gleiten bzw. fallen kann, muss er eine vorbestimmte Form bzw. Kontur haben. Dies wird mit der erfindungsgemäßen Vorrichtung zur Herstellung von offenen Säcken sichergestellt. Zudem wird erreicht, dass der gefüllte Sack selbst nach einer eventuell anschließenden Verdichtung oder sogar extremen Nachverdichtung noch die gewünschte Form aufweist.In order for an open bag 100 to slide or fall smoothly into both the transport box 251 and the filling box 202, it must have a predetermined shape or contour. This is ensured with the device according to the invention for the production of open sacks. In addition, it is achieved that the filled sack still has the desired shape even after a possible subsequent compression or even extreme post-compression.

In den Figuren 2 bis 6 ist rein schematisch ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung 1 zur Herstellung von leeren Säcken 100 in verschiedenen Ansichten rein schematisch dargestellt.In the Figures 2 to 6 1 is a purely schematic representation of an exemplary embodiment of a device 1 according to the invention for the production of empty sacks 100 in various views.

Die Vorrichtung 1 umfasst in dem hier gezeigten Ausführungsbeispiel neben einem Vorrat 20 für Sackmaterial 101 ein Umlenksystem 21, welches mehrere Rollen umfasst, über welche die Lage an Sackmaterial 101 über eine in den Figuren 2 bis 6 nicht näher dargestellte Formschulter 22 dem Formkasten 3 zugeführt wird. Die Formschulter 22 und der Formkasten 3 bilden dabei in dem hier gezeigten Ausführungsbeispiel die Formeinrichtung 2.The device 1 includes in the embodiment shown here in addition to a supply 20 for sack material 101, a deflection system 21, which comprises a plurality of rollers, via which the layer of sack material 101 via a in the Figures 2 to 6 not shown forming shoulder 22 is fed to the mold box 3. In the exemplary embodiment shown here, the molding shoulder 22 and the molding box 3 form the molding device 2.

Dabei weist der Formkasten 3 die Kontur des zu produzierenden offenen Sackes 100 auf, wobei über die Formschulter 22 die Lage bzw. die Lagen an Sackmaterial 101 in geeigneter Weise dem Formkasten 3 zugeführt bzw. um diesen herum geführt werden, sodass das Sackmaterial in der Kontur des zu bildenden Sackes 100 mittels einer Verschlusseinrichtung 7 zu einem Schlauch 102 verbunden werden kann.The molding box 3 has the contour of the open bag 100 to be produced, with the layer or layers of bag material 101 being suitably fed to the molding box 3 or guided around it via the forming shoulder 22, so that the bag material is in the contour of the sack 100 to be formed can be connected to form a tube 102 by means of a closure device 7 .

Das um den Formkasten 3 herumgelegte Sackmaterial 101 wird entlang des Formkastens 3 mittels einer Transporteinrichtung 6 transportiert, welche in dem hier gezeigten Ausführungsbeispiel zwei Riemenantriebe 23 umfasst. Dabei drücken die Riemenantriebe 23 das Sackmaterial 101 gegen den Formkasten 3 und transportieren so das Sackmaterial 101 bzw. den Schlauch 102 entlang der Transportrichtung 16 über den Formkasten 3.The bag material 101 laid around the molding box 3 is transported along the molding box 3 by means of a transport device 6 which comprises two belt drives 23 in the exemplary embodiment shown here. The belt drives 23 press the bag material 101 against the molding box 3 and thus transport the bag material 101 or the tube 102 along the transport direction 16 via the molding box 3.

Der Formkasten 3 weist ein oberes Ende 4 und ein unteres Ende 5 auf, wobei unterhalb des unteren Endes 5 eine Verschlussstation 8 vorgesehen ist, welche aus dem Schlauch 102 aus Sackmaterial 101 durch das Einbringen eines Sackbodens 103 einen Sack 100 bzw. einen Sackformling herstellt, welcher mittels einer Trenneinrichtung 19 von dem Schlauch 102 abgetrennt wird. Erfindungsgemäß ist eine Unterdruckeinrichtung 9 vorgesehen, welche an dem unteren Ende 5 des Formkastens 3 wenigstens einen Unterdruck erzeugt.The molding box 3 has an upper end 4 and a lower end 5, with a closing station 8 being provided below the lower end 5, which produces a sack 100 or a sack blank from the tube 102 made of sack material 101 by introducing a sack bottom 103. which is separated from the hose 102 by means of a separating device 19 . According to the invention, a vacuum device 9 is provided, which generates at least one vacuum at the lower end 5 of the molding box 3 .

In Figur 7 ist rein schematisch ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung 1 dargestellt, wobei zur besseren Übersicht lediglich der Formkasten 3, die Verschlussstation 8 und die Trenneinrichtung 19 dargestellt sind.In figure 7 an exemplary embodiment of a device 1 according to the invention is shown purely schematically, with only the molding box 3, the closing station 8 and the separating device 19 being shown for a better overview.

Man erkennt, dass Sackmaterial 101 bzw. ein bereits gebildeter Schlauch 102 aus Sackmaterial 101 entlang des Formkastens 3 transportiert wird, wobei dieser die Kontur des späteren offenen Sackes 100 aufweist.It can be seen that bag material 101 or a tube 102 that has already been formed from bag material 101 is transported along molding box 3 , which has the contour of later open bag 100 .

In Figur 7 ist rein schematisch dargestellt, was passiert, wenn die Verschlussstation 8 zusammenfährt, um einen Sackboden 103 auszubilden. Da unterhalb des Formkastens 3 noch der Schlauch 102 mit dem Sackboden 103 des zuvor gefertigten Sackes 100 hängt, wird beim Zusammenfahren der Verschlussstation 8 zum Ausbilden des Sackbodens 103 des nachfolgenden Sackes 100 in dem Schlauch 102 befindliche Luft auch in den in Transportrichtung 16 unten liegenden Abschnitt des Schlauches 102 mit dem Sackboden 103 gedrückt.In figure 7 shows purely schematically what happens when the closure station 8 moves together in order to form a bag bottom 103 . Since the hose 102 with the sack base 103 of the previously manufactured sack 100 is still hanging below the molding box 3, when the closure station 8 is moved together to form the sack base 103 of the subsequent sack 100, air in the hose 102 is also released into the section lying at the bottom in the transport direction 16 of the hose 102 pressed with the bottom 103 of the sack.

Dadurch bläht dieser Abschnitt sich auf und die Sackwandungen 104 wölben sich nach außen. Der in dem Sack 100 nun herrschende Überdruck entweicht zwar, sobald die Trenneinrichtung 19, in diesem Fall ein Schlagmesser 24, den dann nach oben hin offenen Sack 100 von dem Rest des Schlauches 102 abgetrennt hat. Jedoch stellen sich die Sackwandungen 104 nicht wieder vollständig bzw. zufriedenstellend zurück. Dies hat den Nachteil, dass der Sack nicht so leicht in einen darunter angeordneten Transportkasten 251 und später auch nicht in den Füllkasten 202 gleiten kann.As a result, this section inflates and the sack walls 104 bulge outwards. The excess pressure now prevailing in the bag 100 escapes as soon as the separating device 19, in this case a fly knife 24, has separated the bag 100, which is then open at the top, from the rest of the tube 102. However, the sack walls 104 do not recover completely or satisfactorily. This has the disadvantage that the sack cannot slide so easily into a transport box 251 arranged underneath and later into the filling box 202 either.

In Figur 8 ist dargestellt, dass in dem hier gezeigten Ausführungsbeispiel über einen freien Strömungsquerschnitt 13 innerhalb des Formkastens 3 über einen Sauganschluss 14 ein Unterdruck an dem unteren Ende 5 des Formkastens 3 erzeugt wird.In figure 8 It is shown that in the exemplary embodiment shown here, a negative pressure is generated at the lower end 5 of the molding box 3 via a free flow cross section 13 within the molding box 3 via a suction connection 14 .

Der Sauganschluss 14 ist hier an dem oberen Ende 4 des Formkastens vorgesehen. Dabei ist unter dem oberen Ende 4 nicht unbedingt der oberste Abschnitt des Formkastens 3 zu verstehen, sondern jeder Abschnitt des Formkastens 3, um welchen das Sackmaterial 101 noch nicht vollumfänglich umgelegt ist, sodass ein freier Zugang zum Formkasten 3 besteht. Gegebenenfalls also auch von oben.The suction connection 14 is provided here at the upper end 4 of the molding box. The upper end 4 does not necessarily mean the uppermost section of the molding box 3, but rather each section of the molding box 3 around which the bag material 101 has not yet been completely folded, so that there is free access to the molding box 3. If necessary, also from above.

Dabei wird der Unterdruck hier über eine Unterdruckleitung 10 bereitgestellt, welche an den Sauganschluss 14 angeschlossen ist. Je nach Ausgestaltung kann die Unterdruckeinrichtung 9 aber auch beispielsweise einen Kolben 11 und/oder eine Venturieinrichtung 12 umfassen.In this case, the negative pressure is provided here via a negative pressure line 10 which is connected to the suction connection 14 . Depending on the design, the vacuum device 9 can also include a piston 11 and/or a venturi device 12, for example.

Mittels der Unterdruckeinrichtung 8 wird wie in Figur 8 angedeutet ein leichter Unterdruck in dem Schlauchabschnitt des zuvor gebildeten Sackes erzeugt, sodass sich die Sackwandung 104 leicht nach innen wölbt.By means of the vacuum device 8, as in figure 8 indicated, a slight negative pressure is generated in the hose section of the previously formed sack, so that the sack wall 104 curves slightly inwards.

Fährt jetzt die Verschlussstation 8 zusammen, wird wieder Luft aus dem Schlauch 102 auch in den Schlauchabschnitt unterhalb der Verschlussstation 8 gedrückt, sodass in dem hier gezeigten Beispiel sich die Sackwandung 104 wieder nach außen drückt, sodass ein offener leerer Sack 100 mit der gewünschten Kontur gebildet wird, welche durch den Formkasten 3 vorgegeben ist und sicher weiter verarbeitet werden kann.If the closing station 8 now closes, air is again pressed from the hose 102 into the hose section below the closing station 8, so that in the example shown here the sack wall 104 is pressed outwards again, so that an open, empty sack 100 with the desired contour is formed is, which is determined by the molding box 3 and can be safely further processed.

Durch das Erzeugen eines leichten Unterdrucks zumindest während der Ausbildung des Sackbodens 103 des nachfolgenden Sackes 100 bzw. beim Zusammenfahren der Verschlussstation 8 wird zudem erreicht, dass sich das Sackmaterial 101 bzw. das aufeinanderliegende Sackmaterial 101 beim Erzeugen des Sackbodens 103 nicht gegeneinander verschiebt, sodass ein ordnungsgemäß gebildeter Sackboden 103 bzw. Verschlussnaht 105 beispielsweise in der Form einer Schweißnaht und/oder Klebenaht erzeugt wird.By generating a slight negative pressure at least during the formation of the sack bottom 103 of the following sack 100 or when the closure station 8 is being moved together, the result is that the sack material 101 or the sack material 101 lying on top of one another does not shift against one another when the sack bottom 103 is being produced, so that a properly formed sack bottom 103 or closure seam 105 is produced, for example, in the form of a welded seam and/or glued seam.

In Figur 9 ist rein schematisch angedeutet, dass an dem unteren Ende 5 des Formkastens 3 ein Transportstempel 15 vorgesehen sein kann, welcher in Transportrichtung 16 und entgegen der Transportrichtung 16 bewegt werden kann. Der Transportstempel 15 ist in dem hier gezeigten Ausführungsbeispiel konisch ausgebildet, sodass wenigstens ein Teil des Transportstempels 15 innerhalb des Formkastens 3 aufgenommen werden kann. Ein weiterer Abschnitt des Transportstempels 15 setzt hier die Außenkontur des Formkastens 3 fort. Wobei der Transportstempel 15 in seinem Außenumfang bevorzugt geringfügig kleiner als der Außenumfang des Formkastens ausgeführt ist, sodass die Folie leicht darübergleiten kann und bei der Rückwärtsbewegung des Transportstempels 15 nicht wieder mit zurückgezogen wird.In figure 9 is indicated purely schematically that a transport stamp 15 can be provided at the lower end 5 of the molding box 3 can, which can be moved in the transport direction 16 and counter to the transport direction 16. In the exemplary embodiment shown here, the transport plunger 15 is of conical design, so that at least part of the transport plunger 15 can be accommodated within the mold box 3 . Another section of the transport plunger 15 continues the outer contour of the mold box 3 here. The outer circumference of the transport plunger 15 is preferably designed to be slightly smaller than the outer circumference of the molding box, so that the film can easily slide over it and is not pulled back with the rearward movement of the transport plunger 15 .

Das Bewegen des Transportstempels 15 in Transportrichtung 16 führt dazu, dass der um den Formkasten 3 gebildete Schlauch 102 auch dann weiter transportiert wird, wenn in diesem Bereich die Transporteinrichtung 6 nicht mehr in Kontakt zu dem Schlauch 102 steht und so das Sackmaterial 101 schiebt. Dabei erleichtert der Transportstempel 15 das Abgleiten bzw. das Lösen bzw. das in Bewegung setzen des Schlauchs 102 von dem Formkasten 3.The movement of the transport plunger 15 in the transport direction 16 means that the tube 102 formed around the molding box 3 is also transported further when the transport device 6 is no longer in contact with the tube 102 in this area and is thus pushing the bag material 101. The transport plunger 15 makes it easier for the tube 102 to slide off or loosen or set in motion from the molding box 3.

Zudem ist in Figur 9 rein schematisch dargestellt, dass durch den Formkasten 3 oder in anderer geeigneter Art und Weise eine Druckleitung 18 in Wirkverbindung zu dem unteren Ende 5 des Formkastens stehen kann. So kann mittels der Druckleitung auch ein Überdruck in dem letzten Schlauchabschnitt erzeugt werden, um den Transport des Sackes 100 bzw. des Schlauchs 102 vor dem Abtrennen des Sackes 100 zu unterstützen.In addition, figure 9 shown purely schematically that a pressure line 18 can be in operative connection to the lower end 5 of the molding box through the molding box 3 or in another suitable manner. Thus, an overpressure can also be generated in the last hose section by means of the pressure line in order to support the transport of the sack 100 or the hose 102 before the sack 100 is separated.

In Figur 10 ist rein schematisch eine Ansicht von unten auf einen Transportstempel 15 in einem Formkasten 3 gezeigt. Hier ist zu sehen, dass der Transportstempel 15 den Querschnitt des Formkastens 3 vollflächig ausfüllt, sodass kein Unterdruck durch den Formkasten 3 hindurch an dem unteren Ende 5 des Formkastens 3 erzeugt werden könnte.In figure 10 a view from below of a transport plunger 15 in a molding box 3 is shown purely schematically. It can be seen here that the transport plunger 15 completely fills the cross section of the molding box 3 so that no negative pressure could be generated through the molding box 3 at the lower end 5 of the molding box 3 .

Daher sind in dem hier gezeigten Ausführungsbeispiel in dem Transportstempel 15 mehrere Durchgangsöffnungen 17 vorgesehen, durch welche hindurch ein durch den Formkasten 3 angelegter Unterdruck auch durch den Transportstempel 15 hindurch am unteren Ende 5 des Formkastens 3 wirken kann, bzw. beim Weiterfördern des Schlauches 102 Luft nachströmen kann.Therefore, in the embodiment shown here in the transport stamp 15 a plurality of through-openings 17 are provided, through which a created by the molding box 3 Negative pressure can also act through the transport plunger 15 at the lower end 5 of the molding box 3, or when the hose 102 is conveyed further, air can flow in.

Zudem ist in Figur 10 dargestellt, dass auch die Druckleitung 18 eine eigene Durchgangsöffnung 17 aufweisen kann oder aber in einer anderen Durchgangsöffnung 17 angeordnet ist, sodass auch ein temporärer Überdruck in dem Schlauch 102 unterhalb des Formkastens 3 durch den Transportstempel hindurch angelegt werden kann.In addition, figure 10 shown that the pressure line 18 can also have its own passage opening 17 or is arranged in another passage opening 17, so that a temporary overpressure can be applied in the hose 102 below the molding box 3 through the transport plunger.

BezugszeichenlisteReference List

11
Vorrichtungcontraption
22
Formeinrichtungmolding facility
33
Formkastenmolding box
44
oberes Endetop end
55
unteres Endelower end
66
Transporteinrichtungtransport device
77
Verschlusseinrichtunglocking device
88th
Verschlussstationcapping station
99
Unterdruckeinrichtungvacuum device
1010
Unterdruckleitungvacuum line
1111
KolbenPistons
1212
Venturieinrichtungventuri device
1313
freier Strömungsquerschnittfree flow cross-section
1414
Sauganschlusssuction port
1515
Transportstempeltransport stamp
1616
Transportrichtungtransport direction
1717
Durchgangsöffnungpassage opening
1818
Druckleitungpressure line
1919
Trenneinrichtungseparator
2020
Vorratstock
2121
Umlenksystemdeflection system
2222
Formschulterform shoulder
2323
Riemenantriebbelt drive
2424
Schlagmesserfly knife
100100
offener Sackopen sack
101101
Sackmaterialbag material
102102
SchlauchHose
103103
Sackbodensack bottom
104104
Sackwandungsack wall
105105
Verschlussnaht (Schweißnaht, Klebenaht)Closing seam (weld seam, adhesive seam)
200200
Abfüllvorrichtung für SchüttgüterFilling device for bulk goods
201201
Füllkarussellfilling carousel
202202
Füllkastenfilling box
250250
Übergabeeinrichtungtransfer device
251251
Transportkastentransport box

Claims (14)

  1. A device (1) for producing at least one open bag (100) from at least one layer of a substantially flexible bag material (101), comprising at least one molding device (2) with at least one molding box (3) in the contour of the bag to be molded with an upper end (4) and a lower end (5), at least one transport device (6) for transporting the bag material (101) along the molding box (3), at least one closing device (7) for connecting the bag material (101) along the molding box to form a tube (102), and at least one closing station (8) for producing a bag base (103), which is arranged below the lower end (5) of the molding box (3),
    characterized in
    that at least one negative pressure device (9) is provided which is suitable and designed to generate, at least temporarily, at least a slight negative pressure in the tube at least at the lower end (5) of the molding box (3).
  2. The device (1) according to claim 1, characterized in that the negative pressure device (9) is suitable and designed to generate the negative pressure before and/or during the manufacture of the bag base (103).
  3. The device (1) according to any one of the preceding claims, characterized in that the negative pressure device (9) comprises at least one negative pressure line (10) and/or at least one piston (11) and/or at least one venturi device (12).
  4. The device (1) according to any one of the preceding claims, characterized in that the molding box has at least one free flow cross-section (13) from the upper end (4) to the lower end (5), and in that the negative pressure device (9) is connected at the upper end (4) to the free flow cross-section (13).
  5. The device (1) according to the preceding claim, characterized in that at least the free flow cross-section and the negative pressure device (9) do not form a completely closed system.
  6. The device (1) according to any one of the preceding claims, characterized in that at least one suction connection (14) is arranged on the molding box (3).
  7. The device (1) according to any one of the preceding claims, characterized in that the negative pressure generated by the negative pressure device (9) is adjustable.
  8. The device (1) according to any one of the preceding claims, characterized in that at least one transport plunger (15) is arranged at the lower end of the molding box, which transport plunger can be displaced at least slightly in the transport direction (16).
  9. The device (1) according to the preceding claim, characterized in that at least one passage opening (17) is provided in the transport plunger (15).
  10. The device (1) according to any one of the preceding claims, characterized in that at least one pressure line (18) is guided through the molding box (3), which pressure line is suitable and designed to generate, at least temporarily, at least a slight overpressure in the tube (102).
  11. The device (1) according to any one of the preceding claims, characterized in that at least one cutting device (19) is associated with the closing station (8).
  12. A method for producing at least one open bag with a device according to any one of the preceding claims, wherein at least one layer of a substantially flexible bag material is placed as continuous material in the contour of the bag to be formed around the molding box and is connected by means of the closing device to form a tube, and wherein a bag base is produced by means of the closing station,
    characterized in
    that at least before and/or during the manufacture of the bag base of a following bag at least a slight negative pressure is generated, at least temporarily, in the tube of bag material by means of the negative pressure device.
  13. The method according to the preceding claim using a device according to at least claim 11, characterized in that during the manufacture of the bag base of the following bag, a completed bag is cut off by means of the cutting device.
  14. The method according to any one of the two preceding claims using a device according to at least claims 8 and 10, characterized in that the transport plunger (15) is displaced for transporting the tube (102) and/or that at least a slight overpressure is generated at least temporarily in the tube (102) by means of the pressure line (18) for transporting the tube (102) along the molding box (3).
EP19748477.7A 2018-07-24 2019-07-11 Device and method for producing at least one empty open bag Active EP3826831B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018117871.9A DE102018117871A1 (en) 2018-07-24 2018-07-24 Device and method for producing at least one empty open sack
PCT/EP2019/068663 WO2020020651A1 (en) 2018-07-24 2019-07-11 Device and method for producing at least one empty open bag

Publications (2)

Publication Number Publication Date
EP3826831A1 EP3826831A1 (en) 2021-06-02
EP3826831B1 true EP3826831B1 (en) 2022-09-14

Family

ID=67513481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19748477.7A Active EP3826831B1 (en) 2018-07-24 2019-07-11 Device and method for producing at least one empty open bag

Country Status (7)

Country Link
US (1) US11780200B2 (en)
EP (1) EP3826831B1 (en)
CN (1) CN112469555B (en)
CA (1) CA3107047A1 (en)
DE (1) DE102018117871A1 (en)
ES (1) ES2932288T3 (en)
WO (1) WO2020020651A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022254313A1 (en) * 2021-06-01 2022-12-08 Lohia Corp Limited An apparatus and a method for producing a bag with an integrally closed bottom and self-closing top and a bag

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH373683A (en) * 1962-11-12 1963-11-30 Sig Schweiz Industrieges Device for filling bulky, pourable material
DE1586328A1 (en) * 1967-06-01 1971-01-14 Verpackungs Und Schokoladenmas Method for relieving the cross weld seam
SE7315471L (en) 1973-11-15 1975-05-16 Platmanufaktur Ab
CH574806A5 (en) * 1974-02-13 1976-04-30 Sig Schweiz Industrieges
DE2519631A1 (en) * 1975-05-02 1976-11-11 Bosch Gmbh Robert Vacuum packaging machine for powdered materials - operates at high output without powder being entrained in sealed region
WO1995013218A1 (en) * 1993-11-12 1995-05-18 Shinwa Corporation Method of and device for packing article by means of athmospheric pressure
JP2010184732A (en) * 2009-02-13 2010-08-26 Ishida Co Ltd Bag-making packaging machine
CN102673835A (en) 2012-05-30 2012-09-19 张秀英 Heat sealer with vacuum pumping device
DE102014113859A1 (en) 2014-09-24 2016-03-24 Haver & Boecker Ohg Apparatus and method for filling open-mouth bags
DE102014113864A1 (en) * 2014-09-24 2016-03-24 Haver & Boecker Ohg Apparatus and method for filling flowable materials

Also Published As

Publication number Publication date
US20210237388A1 (en) 2021-08-05
CN112469555A (en) 2021-03-09
WO2020020651A1 (en) 2020-01-30
ES2932288T3 (en) 2023-01-17
US11780200B2 (en) 2023-10-10
CN112469555B (en) 2023-04-25
EP3826831A1 (en) 2021-06-02
CA3107047A1 (en) 2020-01-30
DE102018117871A1 (en) 2020-01-30

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