EP0161449B1 - Device for closing filled bags - Google Patents

Device for closing filled bags Download PDF

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Publication number
EP0161449B1
EP0161449B1 EP85103921A EP85103921A EP0161449B1 EP 0161449 B1 EP0161449 B1 EP 0161449B1 EP 85103921 A EP85103921 A EP 85103921A EP 85103921 A EP85103921 A EP 85103921A EP 0161449 B1 EP0161449 B1 EP 0161449B1
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EP
European Patent Office
Prior art keywords
sack
pressure
bars
applying
disposed
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.)
Expired
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EP85103921A
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German (de)
French (fr)
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EP0161449A1 (en
Inventor
Konrad Tetenborg
Helmut Hüwelmann
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to AT85103921T priority Critical patent/ATE29007T1/en
Publication of EP0161449A1 publication Critical patent/EP0161449A1/en
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Publication of EP0161449B1 publication Critical patent/EP0161449B1/en
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    • 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
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/02—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • B65B7/06—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap
    • B65B7/08—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap and folding

Definitions

  • the invention relates to a device for closing filled, at least partially made of thermoplastic material, preferably large sacks with a filling volume of 1 m 3 and more, with a conveyor device that moves the filled sacks into the closing station, preferably a conveyor belt, with the upper end of the sack above the Sack filling pulling apart and tightening spreading devices, with pressure strips that can be lowered onto the sack filling and parallel to one another on both sides of the sack end, and which limit a gap between them in the lowered position for the passage of the sack end, and with a closing device provided above the pressure strip.
  • a conveyor device that moves the filled sacks into the closing station, preferably a conveyor belt, with the upper end of the sack above the Sack filling pulling apart and tightening spreading devices, with pressure strips that can be lowered onto the sack filling and parallel to one another on both sides of the sack end, and which limit a gap between them in the lowered position for the passage of the sack end, and with a closing device
  • a device of this type known from DE-AS 12 65 643 is provided with a U-shaped deflection rail which is articulated via a lever to the handlebar carrying a pressure bar and which is pivotable via a pressure medium piston cylinder unit via the upper end of the bag released by the spreading devices in such a way that it opens up is folded and when the conveyor belt is switched on again it is inserted in the folded form in guide rails, via which it is fed to a sewing machine which fixes the folded end of the bag.
  • the object of the invention is therefore to provide a device of the type specified at the outset, with which the bag ends, in particular filled large bags, can be welded in a simple manner and firmly connected to the bag, so that they form compact packaging that can be stored well.
  • the closing device consists of welding strips engaging between the spreading devices and the pressure strips on the end of the bag and arranged on both sides thereof, that the pressure bar at the rear in the conveying direction is provided with adhesive nozzles directed against the upper bag wall pressed against the bag filling, and in that the front pressure bar in the conveying direction has a folding edge or rod facing the end of the bag, which folds it down after pressing on the conveyor after forming the head weld and opening the welding jaws onto the flattened trailing half of the top of the bag provided with glue strips.
  • the front pressure bar in the conveying direction can be provided with adhesive nozzles directed against the folded-over sack end.
  • the protruding frames of the folded end of the sack are then folded onto the glue strips applied by these adhesive nozzles in a downstream station, pressed on and thereby fixed.
  • a large sack 2 filled with filling material is transported from the upstream filling station to the welding and gluing station 3 shown in the drawing.
  • the upper open end of the bag 4 is held vertically and taut in width by grippers 5, which are moved along with the conveyor belt 1 in a manner not shown.
  • the welding and gluing station 3 has a frame with two side parts, of which only the rear side part 6 is indicated.
  • a shaft 7 is mounted in the two side parts 6 and can be rotated by the angle a by means of a pivot lever 8 attached to it via the piston-cylinder unit 8 '.
  • the piston-cylinder unit 8 ' is fastened via a bracket 10 to a crossbar 11 connecting the two side frames 6.
  • two links 12 are placed at a distance from one another, which act as parallel links with two further links 13 placed on a shaft 14, since their free ends are connected in an articulated manner to a holder 15 which consists of two vertical plates 16 and a cross member 17 connecting them.
  • the plates 16 are also connected to one another by three shafts 18-20, the entire holder 15 being held by the links 12 and 13 encompassing the shafts 18 and 20.
  • the shaft 19 as well as on the shaft 20 two equally spaced levers 21 and 22 are clamped at one end, which are articulated at the other ends with vertical arms 23, which are welded with their lower two ends to a support profile 24.
  • This support profile carries a press rake consisting of several bars 25.
  • Two hot-melt adhesive nozzles 26 arranged at a distance from one another are also still attached to the support profile 24, which can be supplied in a manner not shown from a reservoir via supply lines with adhesive if required.
  • the piston-cylinder unit 27 which is connected to the cross member 17 and the pivoted lever 28 clamped onto the shaft 20, the levers 21 and 22 can be pivoted parallel to one another.
  • the right side of the machine facing the viewer has a simpler structure.
  • the rake bars 25 ' are also connected to a support profile 24' and the latter in turn to arms 23 ', the arms 23' being attached to the levers 21 'and 22'.
  • the levers 21 'and 22' are fixedly connected with their ends facing away from the arms 23 'to two shafts 19' and 20 ', with the pivot lever 28' additionally being clamped onto the shaft 19 ', so that the arms 23' and thereby the rake bars 25 'can also be pivoted from the position shown in full lines into the position shown in dashed lines, specifically by the piston-cylinder unit 27' acting on the pivot lever 28 '.
  • the shafts 19 'and 20' are mounted in two vertical plates 16 ', which are held by a crossbar.
  • the support profile 24 ' On the side facing the edge 4, the support profile 24 'has two hot-melt adhesive nozzles 26' arranged at a distance from one another, which are identical to the nozzles 26.
  • the sack 2 In operation, the sack 2 is moved into the station 3 with the edge 4 held taut and held in the direction of arrow A by tongs 5, the tongs 5 having been lowered so far that the upper edge of the sack maintains its height during the subsequent processing steps, that is to say the sack material located below the tongs 5 hangs down lumpy and wrinkled up to the level of the filling material in the manner indicated by the dash-dotted lines.
  • the rake bars on the left with reference to the figure assume the position shown in full lines.
  • the sack 2 or the sack conveyor belt 1 is stopped as soon as the sack edge 4 is in front of the fixed welding jaw 31. At this time, the counter jaw 32 is pivoted up.
  • the piston-cylinder unit 8 ' is then actuated, as a result of which the rake bars 25 are pivoted into the position B, which is only indicated. They then assume the same altitude as the rake bars 25 'shown with solid lines.
  • the piston-cylinder units 27 and 27 ' are then actuated approximately simultaneously, the rake bars 25 and 25' pressing the filling material from above and thereby squeezing out the air located in the bag 2 above the filling material. Subsequently, the counter jaw 32 is pivoted against the welding jaw 31 and thereby the edge of the bag is welded.
  • the jaw 32 swings down again, the piston-cylinder units 27 and 27 'are depressurized, if necessary even subjected to a lower counterpressure in order to bring the rake bars 25 and 25' into a state of equilibrium, and the conveyor belt 1 is switched on.
  • hot melt adhesive runs out of the nozzles 26 and 26 ', so that on the one hand on the upper left half of the sack and on the other hand on the edge of the sack 4 folded over by the rod 30 two parallel adhesive strips are formed.
  • the upper edge of the sack 4 which lies completely flat, is folded over the folding rod 30 onto the adhesive strips formed by the two nozzles 26.
  • the two laterally protruding sack flags are folded over and fixed in place on the two adhesive strips formed by the nozzles 26 '.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Closures (AREA)
  • Making Paper Articles (AREA)
  • Closing Of Containers (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

Apparatus for closing filled sacks, preferably large sacks, which consist at least in part of thermoplastic material, comprises a feeder for feeding the filled sacks into a closing station. The feeder preferably comprises a roller conveyor or a belt conveyor. The apparatus also comprises means for holding the top end portion the sack above the contents of the sack, pressure-applying bars, which are parallel to each other and adapted to be lowered onto the contents of the sack on both sides of the sack end portion, which is held taut, which pressure-applying bars when in a lower position define between them a gap for the passage of the sack between said bars, and closing means provided above the pressure-applying bars. The closing means comprise welding bars and backing bars, which engage the sack end portion between the end-holding means and the pressure-applying bars and are disposed on opposite sides of said sack end portion. That of the pressure-applying bars which is disposed on the trailing side of the sack is provided with adhesive discharge nozzles directed toward the upper wall portion of the sack in contact with the contents of the sack, and that of said pressure-applying bars which is disposed on the leading side of the sack comprises a folding edge or folding rod, which faces the end of the sack. When the end seam weld has been formed and the welding and backing bars have released the sack and the conveyor has subsequently been restarted said folding edge or folding rod causes the end portion of the sack to be folded down onto and forced against the flattened upper portion of the trailing wall of the sack.

Description

Die Erfindung betrifft eine Vorrichtung zum Verschließen gefüllter, zumindest teilweise aus thermoplastischem Material bestehender Säcke, vorzugsweise Großsäcke mit einem Füllvolumen von 1 m3 und mehr, mit einer die gefüllten Säcke in die Schließstation einfahrenden Fördereinrichtung, vorzugsweise einem Förderband, mit das obere Sackende oberhalb der Sackfüllung auseinanderziehenden und straffhaltenden Spreizeinrichtungen, mit beidseits des straffgehaltenen Sackendes auf die Sackfüllung absenkbaren und zueinander parallelen Andrückleisten, die in der abgesenkten Stellung einen Spalt zum Durchtritt des Sackendes zwischen sich begrenzen, und mit einer oberhalb der Andrückleiste vorgesehenen Verschließeinrichtung.The invention relates to a device for closing filled, at least partially made of thermoplastic material, preferably large sacks with a filling volume of 1 m 3 and more, with a conveyor device that moves the filled sacks into the closing station, preferably a conveyor belt, with the upper end of the sack above the Sack filling pulling apart and tightening spreading devices, with pressure strips that can be lowered onto the sack filling and parallel to one another on both sides of the sack end, and which limit a gap between them in the lowered position for the passage of the sack end, and with a closing device provided above the pressure strip.

Eine aus der DE-AS 12 65 643 bekannte Vorrichtung dieser Art ist mit einer über Hebel an die eine Andrückleiste tragenden Lenker angelenkte U-förmige Umlenkschiene versehen, die über eine Druckmittelkolbenzylindereinheit derart über das von den Spreizeinrichtungen freigegebene obere Sackende schwenkbar ist, daß dieses auf sich gefaltet wird und beim erneuten Einschalten des Förderbandes in der gefalteten Form in Leitschienen eingeführt wird, über die es einer das umgefaltete Sackende fixierenden Nähmaschine zugeführt wird.A device of this type known from DE-AS 12 65 643 is provided with a U-shaped deflection rail which is articulated via a lever to the handlebar carrying a pressure bar and which is pivotable via a pressure medium piston cylinder unit via the upper end of the bag released by the spreading devices in such a way that it opens up is folded and when the conveyor belt is switched on again it is inserted in the folded form in guide rails, via which it is fed to a sewing machine which fixes the folded end of the bag.

Insbesondere bei Großsäcken besteht das Bedürfnis, das offene obere Sackende nach der Befüllung durch eine Schweißnaht zu schließen und an dem Sack zu befestigen.In the case of large sacks in particular, there is a need to close the open upper sack end after filling by means of a weld seam and to fasten it to the sack.

Aufgabe der Erfindung ist es daher, eine Vorrichtung der eingangs angegebenen Art zu schaffen, mit der sich in einfacher Weise die Sackenden insbesondere von gefüllten Großsäcken verschweißen und fest mit dem Sack verbinden lassen, so daß diese kompakte, gut lagerfähige Verpackungen bilden.The object of the invention is therefore to provide a device of the type specified at the outset, with which the bag ends, in particular filled large bags, can be welded in a simple manner and firmly connected to the bag, so that they form compact packaging that can be stored well.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Verschließeinrichtung aus zwischen den Spreizeinrichtungen und den Andrückleisten an das Sackende angreifenden und beidseits von diesem angeordneten Schweißleisten besteht, daß die in Förderrichtung hintere Andrückleiste mit gegen die auf die Sackfüllung angedrückte obere Sackwandung gerichteten Klebstoffdüsen versehen ist und daß die in Förderrichtung vordere Andrückleiste- eine dem Sackende zugewandte Faltkante oder -stange besitzt, die dieses nach dem Anfahren des Förderers nach dem Bilden der Kopfschweißnaht und Öffnen der Schweißbacken auf die mit Leimstreifen versehene flachgedrückte nachlaufende Hälfte der Sackoberseite umlegt und andrückt.According to the invention, this object is achieved in that the closing device consists of welding strips engaging between the spreading devices and the pressure strips on the end of the bag and arranged on both sides thereof, that the pressure bar at the rear in the conveying direction is provided with adhesive nozzles directed against the upper bag wall pressed against the bag filling, and in that the front pressure bar in the conveying direction has a folding edge or rod facing the end of the bag, which folds it down after pressing on the conveyor after forming the head weld and opening the welding jaws onto the flattened trailing half of the top of the bag provided with glue strips.

Mit der erfindungsgemäßen Vorrichtung lassen sich kompakte etwa quaderförmige verschlossene Säcke schaffen, die sich raumsparend lagern und transportieren lassen. Beim Umlegen des oberen Sackendes kann dieses von den Spreizeinrichtungen freigegeben oder abgezogen werden.With the device according to the invention, compact, approximately cuboid, closed bags can be created which can be stored and transported in a space-saving manner. When the upper end of the sack is folded down, it can be released or pulled off by the spreading devices.

Um auch die über den Sack seitlich überstehenden Fahnen des umgelegten und auf dem Sack fixierten Sackendes auf dem Sack zu befestigen, kann in weiterer Ausgestaltung der Erfindung die in Förderrichtung vordere Andrückleiste mit gegen das umgelegte Sackende gerichteten Klebstoffdüsen versehen sein. Auf die durch diese Klebstoffdüsen aufgetragenen Leimstreifen werden sodann die überstehenden Fahmen des umgelegten Sackendes in einer nachgeschalteten Station gefaltet, angedrückt und dadurch fixiert.In order to also fix the flags of the folded-over and fixed on the sack end projecting laterally over the sack on the sack, in a further embodiment of the invention the front pressure bar in the conveying direction can be provided with adhesive nozzles directed against the folded-over sack end. The protruding frames of the folded end of the sack are then folded onto the glue strips applied by these adhesive nozzles in a downstream station, pressed on and thereby fixed.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further advantageous embodiments of the invention are the subject of the dependent claims.

Ein Ausführungsbeispiel' der Erfindung wird nachstehend anhand der Zeichnung, in deren einziger Figur die Verschließvorrichtung im Schnitt dargestellt ist, näher erläutert.An embodiment of the invention is explained below with reference to the drawing, in the single figure of which the closing device is shown in section.

Auf dem Förderband 1 wird in Förderrichtung A von einer vorgeschalteten Füllstation ein mit Füllgut gefüllter Großsack 2 zu der in der Zeichnung dargestellten Verschweiß- und Beleimstation 3 transportiert. Während des Transports wird dabei das obere offene Sackende 4 durch mit dem Förderband 1 in nicht dargestellter Weise mitbewegte Greifer 5 senkrecht und in der Breite straff gehalten.On the conveyor belt 1, in the conveying direction A, a large sack 2 filled with filling material is transported from the upstream filling station to the welding and gluing station 3 shown in the drawing. During transport, the upper open end of the bag 4 is held vertically and taut in width by grippers 5, which are moved along with the conveyor belt 1 in a manner not shown.

Die Verschweiß- und Beleimstation 3 weist ein Gestell mit zwei Seitenteilen auf, von denen nur das hintere Seitenteil 6 angedeutet ist. In den beiden Seitenteilen 6 ist eine Welle 7 gelagert, die mittels eines auf ihr befestigten Schwenkhebels 8 über die Kolbenzylindereinheit 8' um den Winkel a verdreht werden kann. Die Kolbenzylindereinheit 8' ist dabei über eine Konsole 10 an einer beide Seitengestelle 6 verbindenden Traverse 11 befestigt. Auf die Welle 7 sind neben dem Schwenkhebel 8 zwei Lenker 12 mit Abstand zueinander aufgesetzt, die mit zwei weiteren auf eine Welle 14 aufgesetzten Lenkern 13 wie Parallellenker wirken, da deren freie Enden gelenkig mit einem Halter 15 verbunden sind, der aus zwei senkrechten Platten 16 und einem diese verbindenden Querträger 17 besteht. Außer durch den Querträger 17 sind die Platten 16 noch durch drei Wellen 18-20 miteinander verbunden, wobei der gesamte Halter 15 von den die Wellen 18 und 20 umgreifenden Lenkern 12 und 13 gehalten wird. Auf die Welle 19 ebenso wie auf die Welle 20 sind je zwei mit Abstand zueinander angeordnete gleichlange Hebel 21 und 22 einendig aufgeklemmt, die anderenends mit senkrechten Armen 23 gelenkig verbunden sind, welche mit ihren unteren beiden Enden mit einem Tragprofil 24 verschweißt sind. Dieses Tragprofil trägt einen aus mehreren Stäben 25 bestehenden Preßrechen. Zwei im Abstand zueinander angeordnete Schmelzkleberdüsen 26 sind ebenfalls noch an dem Tragprofil 24 befestigt, die auf nicht dargestellte Weise aus einem Vorratsbehälter über Zulaufleitungen bei Bedarf mit Kleber versorgt werden können. Über die Kolbenzylindereinheit 27, die mit dem Querträger 17 verbunden ist und den auf die Welle 20 aufgeklemmten Schwenkhebel 28 können die Hebel 21 und 22 parallel zueinander verschwenkt werden.The welding and gluing station 3 has a frame with two side parts, of which only the rear side part 6 is indicated. A shaft 7 is mounted in the two side parts 6 and can be rotated by the angle a by means of a pivot lever 8 attached to it via the piston-cylinder unit 8 '. The piston-cylinder unit 8 'is fastened via a bracket 10 to a crossbar 11 connecting the two side frames 6. On the shaft 7, in addition to the pivot lever 8, two links 12 are placed at a distance from one another, which act as parallel links with two further links 13 placed on a shaft 14, since their free ends are connected in an articulated manner to a holder 15 which consists of two vertical plates 16 and a cross member 17 connecting them. In addition to the cross member 17, the plates 16 are also connected to one another by three shafts 18-20, the entire holder 15 being held by the links 12 and 13 encompassing the shafts 18 and 20. On the shaft 19 as well as on the shaft 20 two equally spaced levers 21 and 22 are clamped at one end, which are articulated at the other ends with vertical arms 23, which are welded with their lower two ends to a support profile 24. This support profile carries a press rake consisting of several bars 25. Two hot-melt adhesive nozzles 26 arranged at a distance from one another are also still attached to the support profile 24, which can be supplied in a manner not shown from a reservoir via supply lines with adhesive if required. Via the piston-cylinder unit 27, which is connected to the cross member 17 and the pivoted lever 28 clamped onto the shaft 20, the levers 21 and 22 can be pivoted parallel to one another.

Die dem Betrachter zugewandte rechte Maschinenseite ist einfacher aufgebaut. Die Rechenstäbe 25' sind zwar ebenfalls mit einem Tragprofil 24' verbunden und letzteres wiederum mit Armen 23', wobei die Arme 23' an den Hebeln 21' und 22' befestigt sind. Die Hebel 21' und 22' sind mit ihren den Armen 23' abgewandten Enden fest mit zwei Wellen 19' und 20' verbunden, wobei auf die Welle 19' zusätzlich noch der Schwenkhebel 28' geklemmt ist, so daß die Arme 23' und dabei auch die Rechenstäbe 25' aus der mit vollen Linien dargestellten Lage in die mit gestrichelten Linien dargestellte verschwenkt werden können, und zwar durch die an dem Schwenkhebel 28' angreifende Kolbenzylindereinheit 27'. Die Wellen 19' und 20' sind in zwei senkrechten Platten 16' gelagert, die von einer Quertraverse gehalten werden. Die vorderen Enden der Stäbe 25' sind miteinander durch eine Faltstange 30 verbunden. An der dem Rand 4 zugewandten Seite weist das Tragprofil 24' zwei mit Abstand zueinander angeordnete Schmelzkleberdüsen 26' auf, die identisch sind mit den Düsen 26. Oberhalb des offenen und senkrecht stehenden Sackrandes 4 befindet sich eine Schweißeinrichtung, die aus einer ortsfesten und aus einer gegen die ortsfeste schwenkbaren Schweißbacke 31 bzw. 32 besteht.The right side of the machine facing the viewer has a simpler structure. The rake bars 25 'are also connected to a support profile 24' and the latter in turn to arms 23 ', the arms 23' being attached to the levers 21 'and 22'. The levers 21 'and 22' are fixedly connected with their ends facing away from the arms 23 'to two shafts 19' and 20 ', with the pivot lever 28' additionally being clamped onto the shaft 19 ', so that the arms 23' and thereby the rake bars 25 'can also be pivoted from the position shown in full lines into the position shown in dashed lines, specifically by the piston-cylinder unit 27' acting on the pivot lever 28 '. The shafts 19 'and 20' are mounted in two vertical plates 16 ', which are held by a crossbar. The front ends of the bars 25 'are connected to each other by a folding bar 30. On the side facing the edge 4, the support profile 24 'has two hot-melt adhesive nozzles 26' arranged at a distance from one another, which are identical to the nozzles 26. Above the open and vertical sack edge 4 there is a welding device which consists of a fixed and a against the stationary pivotable welding jaw 31 or 32.

Im Betrieb wird der Sack 2 mit senkrecht und straffgehaltenem Rand 4 in Pfeilrichtung A von Zangen 5 gehalten in die Station 3 eingefahren, wobei die Zangen 5 schon so weit abgesenkt sind, daß die obere Sackkante während der nachfolgenden Bearbeitungsgänge ihre Höhenlage beibehält, das heißt, das unterhalb der Zangen 5 befindliche Sackmaterial hängt bis zur Füllguthöhe in der strichpunktiert angedeuteten Weise lappig und faltig herunter. Um während des Einfahrens des Sackes 2 in die Station 3 nirgendwo anzuecken, nehmen die mit Bezug auf die Figur linken Rechenstäbe die mit voll ausgezogenen Linien dargestellte Lage ein. Der Sack 2 bzw. das das Sackförderband 1 wird angehalten, sobald sich der Sackrand 4 vor der festen Schweißbacke 31 befindet. Zu diesem Zeitpunkt ist die Gegenbacke 32 hochgeschwenkt. Danach wird die Kolbenzylindereinheit 8' betätigt, wodurch die Rechenstäbe 25 in die nur angedeutete Position B verschwenkt werden. Sie nehmen dann dieselbe Höhenlage ein, wie die mit voll ausgezogenen Linien dargestellten Rechenstäbe 25'. Sodann werden die Kolbenzylindereinheiten 27 und 27' etwa gleichzeitig betätigt, wobei die Rechenstäbe 25 und 25' von oben auf das Füllgut drücken und dabei die oberhalb des Füllgutes im Sack 2 befindliche Luft auspressen. Im Anschluß daran wird die Gegenbacke 32 gegen die Schweißbacke 31 geschwenkt und dadurch der Sackrand verschweißt.In operation, the sack 2 is moved into the station 3 with the edge 4 held taut and held in the direction of arrow A by tongs 5, the tongs 5 having been lowered so far that the upper edge of the sack maintains its height during the subsequent processing steps, that is to say the sack material located below the tongs 5 hangs down lumpy and wrinkled up to the level of the filling material in the manner indicated by the dash-dotted lines. In order not to bother anywhere while the bag 2 is being moved into the station 3, the rake bars on the left with reference to the figure assume the position shown in full lines. The sack 2 or the sack conveyor belt 1 is stopped as soon as the sack edge 4 is in front of the fixed welding jaw 31. At this time, the counter jaw 32 is pivoted up. The piston-cylinder unit 8 'is then actuated, as a result of which the rake bars 25 are pivoted into the position B, which is only indicated. They then assume the same altitude as the rake bars 25 'shown with solid lines. The piston-cylinder units 27 and 27 'are then actuated approximately simultaneously, the rake bars 25 and 25' pressing the filling material from above and thereby squeezing out the air located in the bag 2 above the filling material. Subsequently, the counter jaw 32 is pivoted against the welding jaw 31 and thereby the edge of the bag is welded.

Ist dies geschehen, schwenkt die Backe 32 wieder ab, die Kolbenzylindereinheiten 27 und 27' werden drucklos geschaltet, bei Bedarf sogar mit geringerem Gegendruck beaufschlagt, um die Rechenstäbe 25 und 25' in einen Gleichgewichtszustand zu bringen, und das Förderband 1 wird eingeschaltet. Während des Abtransportes des Sackes 2 durch das Förderband 1 läuft Schmelzkleber aus den Düsen 26 und 26' aus, so daß einerseits auf die obere linke Sackhälfte und andererseits auf den durch die Stange 30 umgelegten Sackrand 4 je zwei parallel zueinander verlaufende Kleberstreifen gebildet werden. Auf die durch die beiden Düsen 26 gebildeten Klebestreifen wird, wie gesagt, über die Faltstange 30 der obere Sackrand 4 gefaltet, der ganz flach liegt. Die beiden seitlich überstehenden Sackfahnen werden in einer nachfolgenden Station auf die beiden durch die Düsen 26' gebildeten Kleberstreifen nach innen umgelegt und fixiert.Once this has been done, the jaw 32 swings down again, the piston-cylinder units 27 and 27 'are depressurized, if necessary even subjected to a lower counterpressure in order to bring the rake bars 25 and 25' into a state of equilibrium, and the conveyor belt 1 is switched on. During the removal of the sack 2 by the conveyor belt 1, hot melt adhesive runs out of the nozzles 26 and 26 ', so that on the one hand on the upper left half of the sack and on the other hand on the edge of the sack 4 folded over by the rod 30 two parallel adhesive strips are formed. As mentioned, the upper edge of the sack 4, which lies completely flat, is folded over the folding rod 30 onto the adhesive strips formed by the two nozzles 26. In a subsequent station, the two laterally protruding sack flags are folded over and fixed in place on the two adhesive strips formed by the nozzles 26 '.

Claims (7)

1. Apparatus for closing filled sacks consisting at least in part of thermoplastic material, preferably large sacks having a volume capacity of 1 m3 and more, comprising a conveyor preferably consisting of a belt conveyor (1) and serving to move the filled sacks (2) into the closing station, pressure-applying bars (25, 25'), which are parallel to each other and are adapted to be lowered onto the contents of the sack on both sides of the sack end (4), which is held taut by spreading means (5), which pressure-applying bars in their lowered position define between them a gap, which constitutes a passage for the sack end, and closing means (31, 32) disposed above the pressure-applying bar, characterized in that the closing device consists of welding bars (31, 32), which engage the sack end (4) between the spreading means (5) and the pressure-applying bars (25, 25') and are disposed on opposite sides of the sack end, the pressure-applying bar (25) which is disposed at the rear in the direction of conveyance is provided with adhesive nozzles (26), which are directed to the upper sack ply that is forced onto the contents of the sack, and that pressure-applying bar (25') which is disposed in front in the direction of conveyance comprises a folding edge or folding rod (30), which faces the sack end (4) and when the conveyor (1) has been started, the seam weld at the head has been formed and the welding jaws have been opened that folding edge or rod reversely folds the sack end and urges it against the trailing half of the upper side of the sack, which trailing half has been provided with glue strips and collapsed under pressure.
2. Apparatus according to claim 1, characterized in that that pressure-applying bar (15') which is disposed in front in the direction of conveyance (A) is provided with adhesive nozzles (26'), which are directed to the reversely folded sack end (4).
3. Apparatus according to claim 1 or 2, characterized in that the pressure-applying bars (25, 25') consist of rods which are arranged to constitute a grate.
4. Apparatus according to any of claims 1 to 3, characterized in that each pressure-applying bar (25, 25') is platelike and covers approximately onehalf of the upper surface of the sack.
5. Apparatus according to any of claims 1 to 3, characterized in that the pressure-applying bars (25, 25') are provided with vertical carriers (23, 23'), which are connected to the frame by parallel links (21, 22, 21', 22') in such a manner that the pressure-applying bars extending in a vertical plane can be lowered parallel to themselves onto the contents of the sack on both sides of the sack end (4), which is held taut.
6. Apparatus according to claim 5, characterized in that the parallel links (21, 22) associated with the pressure-applying bar (25) which is disposed at the rear in the direction of travel are - pivoted to the vertical coupling link (16) associated with parallel links (12, 13) which are movably mounted in the frame and are pivoted to said coupling link on the same side as said rear pressure-applying bar so that the pressure-applying bar (25) is adapted to be raised above the top edge of the top edge of the sack end (4) which top edge is held by spreading means (5), which move in unison with the belt conveyor (1).
7. Apparatus according to any of the preceding claims, characterized in that one of the parallel links (12, 21, 22') of each set is secured to an associated shaft (7, 20, 19'), which serves to pivotally move the parallel links and for that purpose is connected to a lever (8, 28, 28'), to which a fluid-operable piston cylinder unit (8', 27, 27') is pivoted.
EP85103921A 1984-04-26 1985-04-01 Device for closing filled bags Expired EP0161449B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85103921T ATE29007T1 (en) 1984-04-26 1985-04-01 DEVICE FOR CLOSING FILLED BAGS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3415604A DE3415604C2 (en) 1984-04-26 1984-04-26 Device for closing filled sacks
DE3415604 1984-04-26

Publications (2)

Publication Number Publication Date
EP0161449A1 EP0161449A1 (en) 1985-11-21
EP0161449B1 true EP0161449B1 (en) 1987-08-19

Family

ID=6234446

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Application Number Title Priority Date Filing Date
EP85103921A Expired EP0161449B1 (en) 1984-04-26 1985-04-01 Device for closing filled bags

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US (1) US4574560A (en)
EP (1) EP0161449B1 (en)
AT (1) ATE29007T1 (en)
CA (1) CA1254867A (en)
DE (1) DE3415604C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872303A (en) * 1988-02-25 1989-10-10 Mid America Machine Corp. Bag top forming method and apparatus
DE3818910A1 (en) * 1988-06-03 1989-12-14 Haver & Boecker DEVICE FOR FILLING AND SEALING OPEN BAGS
CA2204309A1 (en) * 1997-05-02 1998-11-02 Salvatore Nicastro Bag filling and sealing apparatus
CN108891683A (en) * 2018-07-03 2018-11-27 合肥亚卡普机械科技有限公司 A kind of sealing device for food packaging processing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252116B (en) * 1967-10-12 Fr Hesser, Maschinenfabnk-Ak tiengesellschaft, Stuttgart-Bad Cannstatt Device for the production of Klebeverbmdungen on closure parts of bags or the like
US3115736A (en) * 1961-04-24 1963-12-31 Axel F Peterson Bag closing apparatus
DE1923332U (en) * 1964-08-19 1965-09-09 Holstein & Kappert Maschf DEVICE FOR WELDING PROJECTING PACKAGING PARTS TO FILLED PACKAGES.
DE1265643B (en) * 1965-08-24 1968-04-04 Mahlkuch Greif Werk Ernst Device for folding over the top of filled bags
DE1931100A1 (en) * 1969-06-19 1971-01-07 Savannah Sugar Refining Corp Packing machine
DE2013486A1 (en) * 1970-03-20 1971-09-30 Windmoller & Holscher, 4540 Lengerich Method for closing filled paper sacks
DE2240909C3 (en) * 1972-08-19 1979-08-02 Packautomatic Gmbh & Co Kg, 5828 Ennepetal Device for closing a foil pack, in particular a foil bag
US3968629A (en) * 1973-05-29 1976-07-13 Cvp Systems, Inc. Packaging apparatus
DE2812138C2 (en) * 1978-03-20 1983-06-01 Jagenberg-Werke AG, 4000 Düsseldorf Device for folding and closing gable-shaped heads of folding boxes
DE3118866C2 (en) * 1981-05-13 1984-04-12 Haver & Boecker, 4740 Oelde "Machine for filling and closing plastic sacks, preferably gusseted sacks or flat sacks"
DE3138407C2 (en) * 1981-09-26 1987-04-23 A. Beeck GmbH & Co KG, 2900 Oldenburg Device for folding the edges of filled folding bags
DE3204773A1 (en) * 1982-02-11 1983-08-18 Altstädter Verpackungs-Vertriebsgesellschaft mbH, 6102 Pfungstadt DEVICE FOR CLOSING A LIQUID PACK

Also Published As

Publication number Publication date
US4574560A (en) 1986-03-11
CA1254867A (en) 1989-05-30
DE3415604A1 (en) 1985-11-07
DE3415604C2 (en) 1986-03-13
EP0161449A1 (en) 1985-11-21
ATE29007T1 (en) 1987-09-15

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