EP0399948B1 - Method and device for continuously making packages - Google Patents

Method and device for continuously making packages Download PDF

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Publication number
EP0399948B1
EP0399948B1 EP90810340A EP90810340A EP0399948B1 EP 0399948 B1 EP0399948 B1 EP 0399948B1 EP 90810340 A EP90810340 A EP 90810340A EP 90810340 A EP90810340 A EP 90810340A EP 0399948 B1 EP0399948 B1 EP 0399948B1
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EP
European Patent Office
Prior art keywords
tube
items
negative pressure
intake chamber
transportation
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 - Lifetime
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EP90810340A
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German (de)
French (fr)
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EP0399948A1 (en
Inventor
Beda Ziegler
Ernst Wanner
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Schweizerische Industrie Gesellschaft
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Schweizerische Industrie Gesellschaft
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Publication of EP0399948A1 publication Critical patent/EP0399948A1/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
    • B65B23/00—Packaging fragile or shock-sensitive articles other than bottles; Unpacking eggs
    • B65B23/10—Packaging biscuits
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/06—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it
    • B65B9/067—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it the web advancing continuously

Definitions

  • the present invention relates to a method and a device for the continuous production of packs according to the preamble of patent claims 1 and 5, respectively.
  • product safeguards such as belts, chains with holders, i.e. with fingers, chains with pressing pieces and the like, are often applied to the biscuit groups or in the group spaces between a hose folding device and a transverse heating.
  • product safeguards such as belts, chains with holders, i.e. with fingers, chains with pressing pieces and the like, are often applied to the biscuit groups or in the group spaces between a hose folding device and a transverse heating.
  • a device is known in which the objects are held by rotating holders and in which the hose conveying means for the further transport of the hose is located in an area between a sealing device and the hose folding means.
  • Such product locks which can touch the hose hard or soft, for example also via foam rubber or leaf springs, are designed for the product dimensions and tolerances.
  • a suitable safety device must be available for each new product dimension, which can be replaced with the old one.
  • Such packaging machines sometimes also have suction devices which, after the tube feed means, are viewed in the conveying direction and / or are arranged in the region of the transverse heaters in order to prevent the packs from inflating or to enable better transverse sealing and thus more attractive gusset folds.
  • suction devices which, after the tube feed means, are viewed in the conveying direction and / or are arranged in the region of the transverse heaters in order to prevent the packs from inflating or to enable better transverse sealing and thus more attractive gusset folds.
  • Such a packaging machine is known for example from DE-A-28 00 658. However, this does not solve the disadvantages shown.
  • the device according to FIG. 1 has a transport chain 1 on which two stacks 2, 3 of biscuits standing upright are transported, the stack 3 being located partly in a hose folding means or folding box 4.
  • a suction chamber 5 in which a deflection wheel 6 for the transport chain 1 is accommodated as the first means of transport.
  • a take-off roller 7 two optionally electrically heated sealing rollers 8 and 9 and a transverse sealing roller 10 are present, which cooperate in the second transport.
  • drivers 11, 11 ', 11 ⁇ , .... and retaining fingers 12, 12', ... are arranged at equal intervals.
  • the conveyor chain 1 resting on the upper guide 13 enters the suction chamber 5 at the top and emerges at the bottom of a lower guide 14.
  • the interior of the suction chamber 5 is connected via a suction duct 15 to a fan 16, which form a suction device.
  • the opening of the suction channel 15 can be gradually closed with a displaceable throttle plate 17.
  • the suction chamber 5 has one with the Opening communicating atmosphere, which can be closed via a likewise displaceable closure plate 18.
  • the device according to FIG. 1 also has a film roll 19, from which a film 20 is drawn to produce the packs.
  • FIG. 2 the folding box 4, the suction chamber 5 with the suction channel 15 and two rollers 7 ', 7 ⁇ of the take-off roller 7 (Fig. 1) are shown schematically.
  • FIG. 3 shows a rear view of the suction chamber 5, the suction channel 15 and the fan 16.
  • the transport chain 1 a retaining finger 51, a driver 52, the upper guide 13 and the lower guide 14 can also be seen.
  • the device according to the invention functions as follows:
  • the biscuits stacked upright on the conveyor level between the carriers 11 and the retaining fingers 12 are transported in groups through the transport chain 1 to the folding box 4.
  • the packaging material 20 is tubular around the in a known manner packing biscuits or other objects, with a protruding longitudinal seam 21 being formed on the lower side, which is detected by the driven rollers 7, 8, 9, which can each comprise, for example, a pair of rollers (7 ', 7 ⁇ in FIG. 2) to advance the hose.
  • the longitudinal seam 21 is welded by the sealing rollers 8 and 9.
  • the tube 20 with the enclosed objects then passes into the cross-sealing roller 10 to produce the cross-welding point in order to weld one end of the packaging in each case.
  • the objects are thus transported through the conveyor chain 1 only up to the level of the suction chamber 5, where the drivers 11 'and retaining fingers 12' tip over in the manner shown in FIGS. 4 to 6 sequentially.
  • the action of the fan 16 creates a negative pressure in the suction chamber 5, which can propagate through the entire interior of the hose. This pressure is subjected to jerky fluctuations which occur when the retaining fingers 12 or the drivers 11 pass through the openings 53 and 54, because the effective opening area of these openings is then smaller.
  • the fan 16 must therefore be strong enough to suck up the air that flows in larger or smaller quantities through these openings.
  • An oversized fan 16 can expediently be provided, the vacuum effect of which is reduced by the plates 17 and 18.
  • the instantaneous vacuum surges can also be provided that the end of the folding box 4 is not flush with the beginning of the suction chamber 5. 1, the suction chamber 5 can therefore be shifted both to the right and to the left.
  • the vacuum can be, for example, between 0.03 to 0.1 mWS (approx. 300 to 1000 Pascal), although these limits are not mandatory.
  • the closure plate 18 and / or the throttle plate 17 can be adjusted in such a way that the changes in vacuum are less than +/- 0.01 mWS. It is also possible to control the closure 18 and / or the throttle 17 in time with the passages of the rotating holder 11, 12 'or 51, 53 through the openings 53 and 54 that the negative pressure in the suction chamber 5 is only small Subject to fluctuations.
  • the mechanism by which these plates 17, 18 can be controlled is not shown in the figures because its manufacture does not present any particular difficulties for the person skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Basic Packing Technique (AREA)
  • Making Paper Articles (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren und eine Vorrichtung zum kontinuierlichen Herstellen von Packungen gemäss dem Oberbegriff des Patentanspruchs 1 bzw. 5.The present invention relates to a method and a device for the continuous production of packs according to the preamble of patent claims 1 and 5, respectively.

Bei der kontinuierlichen Verpackung von Biscuits werden oft zwischen einer Schlauchfalteinrichtung und einer Querheizung sogenannte Produktesicherungen wie Bänder, Ketten mit Haltern, das heisst mit Fingern, Ketten mit Pressstücken und dgl. auf die Biscuits-Gruppen oder in den Gruppenzwischenräumen angewendet. Aus der GB-A-1 444 277 ist beispielsweise eine Vorrichtung bekannt, bei der die Gegenstände von umlaufenden Haltern gehalten werden und bei der sich die Schlauchfördermittel für den Weitertransport des Schlauches in einem Bereich zwischen einer Siegeleinrichtung und den Schlauchfaltmitteln befindet.
Solche Produktesicherungen, die den Schlauch hart oder weich, beispielsweise auch über Schaumgummi oder Blattfedern berühren können, sind auf die Produkteabmessungen und Toleranzen ausgelegt. Für jede neue Produkt-Abmessung muss eine geeignete Sicherungseinrichtung bereit stehen, die mit der alten ausgetauscht werden kann.In the continuous packaging of biscuits, so-called product safeguards such as belts, chains with holders, i.e. with fingers, chains with pressing pieces and the like, are often applied to the biscuit groups or in the group spaces between a hose folding device and a transverse heating. From GB-A-1 444 277, for example, a device is known in which the objects are held by rotating holders and in which the hose conveying means for the further transport of the hose is located in an area between a sealing device and the hose folding means.
Such product locks, which can touch the hose hard or soft, for example also via foam rubber or leaf springs, are designed for the product dimensions and tolerances. A suitable safety device must be available for each new product dimension, which can be replaced with the old one.

Dies verursacht grosse Aufwendungen; insbesondere ergeben sich Schwierigkeiten und eine Verminderung der Betriebssicherheit bei grossen Produkt-Toleranzen, die an sich gewünscht wären.This causes great expenses; in particular, difficulties arise and a reduction in operational safety in the case of large product tolerances, which would be desirable per se.

Solche Verpackungsmaschinen weisen manchmal auch Saugeinrichtungen auf, die nach dem Schlauchvorschub-Mittel in Förderrichtung gesehen und/oder im Bereich der Querheizungen angeordnet sind, um eine Aufblähung der Packungen zu vermeiden oder eine bessere Quersiegelung und damit schönere Zwickelfalten zu ermöglichen. Eine derartige Verpakkungsmaschine ist beispielsweise aus der DE-A-28 00 658 bekannt. Damit werden jedoch die angezeigten Nachteile nicht behoben.Such packaging machines sometimes also have suction devices which, after the tube feed means, are viewed in the conveying direction and / or are arranged in the region of the transverse heaters in order to prevent the packs from inflating or to enable better transverse sealing and thus more attractive gusset folds. Such a packaging machine is known for example from DE-A-28 00 658. However, this does not solve the disadvantages shown.

Solche Nachteile werden erfindungsgemäss durch ein Verfahren mit den im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmalen gelöst. Die Vorrichtung zur Durchführung dieses Verfahrens ist im Anspruch 5 und andere vorteilhafte Ausgestaltungen der Erfindung in weiteren abhängigen Ansprüchen angegeben.Such disadvantages are solved according to the invention by a method with the features specified in the characterizing part of claim 1. The device for performing this method is specified in claim 5 and other advantageous embodiments of the invention in further dependent claims.

Im folgenden wird die Erfindung beispielsweise anhand einer Zeichnung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Längsquerschnitt durch die erfindungsgemässe Vorrichtung,
Fig. 2
einen perspektivischen Ausschnitt von Fig. 1 in grösserem Massstab,
Fig. 3
einen Schnitt durch die Linie AA in Fig. 1,
Fig. 4 bis 6
eine schematische Sequenzdarstellung der Bewegung des Rückhaltefingers und des Mitnehmers einer solchen Vorrichtung.
The invention is explained in more detail below, for example, using a drawing. Show it:
Fig. 1
2 shows a schematic longitudinal cross section through the device according to the invention,
Fig. 2
2 shows a perspective section of FIG. 1 on a larger scale,
Fig. 3
2 shows a section through the line AA in FIG. 1,
4 to 6
a schematic sequence representation of the movement of the retaining finger and the driver of such a device.

Die Vorrichtung nach Fig. 1 weist eine Transportkette 1 auf, auf der zwei Stapel 2, 3 hochkant stehender Biskuits transportiert werden, wobei der Stapel 3 sich teilweise in einem Schlauchfaltmittel oder Faltkasten 4 befindet. Nach dem Faltkasten 4 und unterhalb der Förderebene ist eine Saugkammer 5 vorhanden, in der ein Umlenkrad 6 für die Transportkette 1 als erstes Transportmittel untergebracht ist. Nach der Saugkammer 5 in Förderrichtung sind eine Abzugswalze 7, zwei gegebenenfalls elektrisch beheizte Siegelwalzen 8 und 9 und eine Quersiegelwalze 10 vorhanden, die beim zweiten Transport mitwirken. An der Förderkette 1 sind in gleichen Abständen Mitnehmer 11, 11′, 11˝, .... und Rückhaltefinger 12, 12′, ... angeordnet. Die auf oberer Führung 13 aufliegende Förderkette 1 tritt oben in die Saugkammer 5 ein und unten bei einer unteren Führung 14 heraus. Der Innenraum der Saugkammer 5 ist über einen Saugkanal 15 mit einem Ventilator 16 verbunden, die eine Saugeinrichtung bilden. Die Oeffnung des Saugkanals 15 ist mit einer verschiebbaren Drosselplatte 17 graduell verschliessbar. Die Saugkammer 5 weist eine mit der Atmosphäre kommunizierende Oeffnung auf, die über eine ebenfalls verschiebbare Verschlussplatte 18 verschliessbar ist. Die Vorrichtung nach Fig. 1 weist auch eine Folienrolle 19 auf, von der eine Folie 20 zur Herstellung der Packungen gezogen wird.The device according to FIG. 1 has a transport chain 1 on which two stacks 2, 3 of biscuits standing upright are transported, the stack 3 being located partly in a hose folding means or folding box 4. After the folding box 4 and below the conveyor level there is a suction chamber 5 in which a deflection wheel 6 for the transport chain 1 is accommodated as the first means of transport. After the suction chamber 5 in the conveying direction, a take-off roller 7, two optionally electrically heated sealing rollers 8 and 9 and a transverse sealing roller 10 are present, which cooperate in the second transport. On the conveyor chain 1 drivers 11, 11 ', 11˝, .... and retaining fingers 12, 12', ... are arranged at equal intervals. The conveyor chain 1 resting on the upper guide 13 enters the suction chamber 5 at the top and emerges at the bottom of a lower guide 14. The interior of the suction chamber 5 is connected via a suction duct 15 to a fan 16, which form a suction device. The opening of the suction channel 15 can be gradually closed with a displaceable throttle plate 17. The suction chamber 5 has one with the Opening communicating atmosphere, which can be closed via a likewise displaceable closure plate 18. The device according to FIG. 1 also has a film roll 19, from which a film 20 is drawn to produce the packs.

In Fig. 2 sind der Faltkasten 4, die Saugkammer 5 mit dem Saugkanal 15 und zwei Rollen 7′, 7˝ der Abzugwalze 7 (Fig. 1) schematisch dargestellt.In Fig. 2 the folding box 4, the suction chamber 5 with the suction channel 15 and two rollers 7 ', 7˝ of the take-off roller 7 (Fig. 1) are shown schematically.

Fig. 3 zeigt eine Ansicht von hinten der Saugkammer 5, des Saugkanals 15 und des Ventilators 16. In Fig. 3 sind auch die Transportkette 1, ein Rückhaltefinger 51, ein Mitnehmer 52, die obere Führung 13 und die untere Führung 14 ersichtlich. Insbesondere soll auf die Oeffnungen 53 und 54 hingewiesen werden, durch die die Förderkette 1 in die Saugkammer 5 hinein bzw. aus ihr heraustritt.FIG. 3 shows a rear view of the suction chamber 5, the suction channel 15 and the fan 16. In FIG. 3 the transport chain 1, a retaining finger 51, a driver 52, the upper guide 13 and the lower guide 14 can also be seen. In particular, attention should be drawn to the openings 53 and 54 through which the conveyor chain 1 enters and exits the suction chamber 5.

Die erfindungsgemässe Vorrichtung funktioniert folgendermassen:
Die zwischen den Mitnehmern 11 und den Rückhaltefingern 12 hochkant auf der Förderebene gestapelten Biscuits werden gruppenweise durch die Transportkette 1 zum Faltkasten 4 transportiert. Im Faltkasten 4 wird auf an sich bekannte Weise das Verpackungsmaterial 20 schlauchförmig um die zu verpackenden Biscuits oder anderen Gegenstände gelegt, wobei auf der unteren Seite eine vorstehende Längsnaht 21 entsteht, die von den angetriebenen Walzen 7, 8, 9, die beispielsweise je ein Rollenpaar (7′, 7˝ in Fig. 2) umfassen kann, erfasst wird, um den Schlauch weiterzufördern. Gleichzeitig wird die Längsnaht 21 durch die Siegelwalzen 8 und 9 verschweisst. Der Schlauch 20 mit den eingeschlossenen Gegenständen gelangt dann in die Quersiegelwalze 10 zum Herstellen der Querschweissstelle, um jeweils ein Ende der Verpackung zu verschweissen. Die Gegenstände werden somit durch die Förderkette 1 nur bis zur Höhe der Saugkammer 5 transportiert, wo die Mitnehmer 11′ und Rückhaltefinger 12′ in der aus den Figuren 4 bis 6 sequentiell dargestellten Weise umkippen. Durch die Wirkung des Ventilators 16 entsteht in der Saugkammer 5 ein Unterdruck, der sich durch den ganzen Schlauchinnenraum fortpflanzen kann. Dieser Druck ist ruckartigen Schwankungen ausgesetzt, die beim Durchgang der Rückhaltefinger 12 bzw. der Mitnehmer 11 durch die Oeffnungen 53 und 54 entstehen, weil dann die effektive Oeffnungsfläche dieser Oeffnungen geringer ist. Der Ventilator 16 muss daher genügend kräftig sein, um die Luft aufzusaugen, die in grösseren oder kleineren Mengen durch diese Oeffnungen fliesst. Zweckmässigerweise kann ein überdimensionierter Ventilator 16 vorgesehen sein, dessen Vakuumwirkung durch die Platten 17 und 18 reduziert wird. Die erwähnten ruckartigen Unterdruckeinwirkungen erzeugen bei gewissen Schlauchmaterialien derart leichte kaum sichtbare permanente Deformationen der Schlauchfolie um die Kanten der Gegenstände herum, dass dadurch die Gegenstände nicht umfallen, wenn sie nach ihrem Durchgang durch den Faltkasten nicht mehr von einem Rückhaltefinger 12′ und einem Mitnehmer 11′, sondern nur noch vom Schlauch gehalten werden. In Fig. 1 befinden sich das Ende des Faltkastens 4 und der Anfang der Saugkammer 5 in derselben Ebene AA. Wenn der Rückhaltefinger 51 (Fig. 3) durch die Oeffnung 53, die sich in der Ebene AA befindet, in die Saugkammer 5 hineinkommt, ergibt sich ein erster momentaner Unterdruckstoss, der sich insbesondere auf das erste Biscuit der Gruppe 3 und auf das letzte Biscuit der vorhergehenden Gruppe 3′ in der Transportrichtung wie oben erwähnt auswirkt, während beide Biscuits noch vom Rückhaltefinger 12′ beziehungsweise vom Mitnehmer 11′ gehalten werden. Beim Durchgang des Mitnehmers 11˝ durch die untere Oeffnung 54 (Fig. 3) ergibt sich ein zweiter momentaner Unterdruckstoss, der den beschriebenen Effekt unterstützt. Eine weitere Unterstützung des beschriebenen Effekts kann auch erreicht werden, indem man ein gleichzeitiges Durchgehen der Rückhaltefinger und/oder Mitnehmer durch die Oeffnungen 53 und 54 in einem Moment vorsieht, in dem das erste Biscuit einer Gruppe 3 und das letzte Biscuit der vorhergehenden Gruppe 3′ noch gehalten werden. Es hat sich jedoch gezeigt, dass diese zusätzliche Unterstützung nicht bei allen Verpackungsmaterialien erforderlich ist. Die momentanen Unterdruckstösse können auch derart vorgesehen sein, dass das Ende des Faltkastens 4 nicht mit dem Anfang der Saugkammer 5 bündig ist. In bezug auf Fig. 1 kann daher die Saugkammer 5 sowohl nach rechts als auch nach links verschoben sein. Der Unterdruck kann beispielsweise zwischen 0,03 bis 0,1 mWS (ca. 300 bis 1000 Pascal) sein, wobei diese Grenzen nicht zwingend sind.The device according to the invention functions as follows:
The biscuits stacked upright on the conveyor level between the carriers 11 and the retaining fingers 12 are transported in groups through the transport chain 1 to the folding box 4. In the folding box 4, the packaging material 20 is tubular around the in a known manner packing biscuits or other objects, with a protruding longitudinal seam 21 being formed on the lower side, which is detected by the driven rollers 7, 8, 9, which can each comprise, for example, a pair of rollers (7 ', 7˝ in FIG. 2) to advance the hose. At the same time, the longitudinal seam 21 is welded by the sealing rollers 8 and 9. The tube 20 with the enclosed objects then passes into the cross-sealing roller 10 to produce the cross-welding point in order to weld one end of the packaging in each case. The objects are thus transported through the conveyor chain 1 only up to the level of the suction chamber 5, where the drivers 11 'and retaining fingers 12' tip over in the manner shown in FIGS. 4 to 6 sequentially. The action of the fan 16 creates a negative pressure in the suction chamber 5, which can propagate through the entire interior of the hose. This pressure is subjected to jerky fluctuations which occur when the retaining fingers 12 or the drivers 11 pass through the openings 53 and 54, because the effective opening area of these openings is then smaller. The fan 16 must therefore be strong enough to suck up the air that flows in larger or smaller quantities through these openings. An oversized fan 16 can expediently be provided, the vacuum effect of which is reduced by the plates 17 and 18. The jerky negative pressure effects mentioned produce such in certain hose materials slight, hardly visible permanent deformations of the tubular film around the edges of the objects, so that the objects do not fall over when they are no longer held by a retaining finger 12 'and a driver 11' after their passage through the folding box, but only by the hose. In Fig. 1, the end of the folding box 4 and the beginning of the suction chamber 5 are in the same plane AA. When the restraining finger 51 (FIG. 3) enters the suction chamber 5 through the opening 53, which is located in the plane AA, there is a first instantaneous vacuum surge, which affects in particular the first biscuit in group 3 and the last biscuit the previous group 3 'in the direction of transport as mentioned above, while both biscuits are still held by the retaining finger 12' or the driver 11 '. When the driver 11˝ passes through the lower opening 54 (FIG. 3), there is a second instantaneous vacuum surge which supports the effect described. A further support for the described effect can also be achieved by providing for simultaneous passage of the retaining fingers and / or drivers through the openings 53 and 54 at a moment in which the first biscuit of a group 3 and the last biscuit of the preceding group 3 ′ still be held. However, it has been shown that this additional support is not required for all packaging materials. The instantaneous vacuum surges can also be provided that the end of the folding box 4 is not flush with the beginning of the suction chamber 5. 1, the suction chamber 5 can therefore be shifted both to the right and to the left. The vacuum can be, for example, between 0.03 to 0.1 mWS (approx. 300 to 1000 Pascal), although these limits are not mandatory.

Bei anderen Verpackungsmaterialien, die die oben erwähnten permanenten Deformationen nicht zeigen, kann die Verschlussplatte 18 und/oder die Drosselplatte 17 derart eingestellt werden, dass die Unterdruckänderungen weniger als +/- 0,01 mWS betragen. Dabei ist es auch möglich, den Verschluss 18 und/oder die Drossel 17 derart im Takt mit den Durchgängen der umlaufenden Halter 11, 12′ oder 51, 53 durch die Oeffnungen 53 und 54 zu steuern, dass der Unterdruck in der Saugkammer 5 nur kleinen Schwankungen unterworfen wird. Der Mechanismus, mit dem diese Platten 17, 18 gesteuert werden können, wird in den Figuren nicht dargestellt, weil seine Herstellung keine besonderen Schwierigkeiten für den Fachmann bietet.For other packaging materials that do not show the permanent deformations mentioned above, the closure plate 18 and / or the throttle plate 17 can be adjusted in such a way that the changes in vacuum are less than +/- 0.01 mWS. It is also possible to control the closure 18 and / or the throttle 17 in time with the passages of the rotating holder 11, 12 'or 51, 53 through the openings 53 and 54 that the negative pressure in the suction chamber 5 is only small Subject to fluctuations. The mechanism by which these plates 17, 18 can be controlled is not shown in the figures because its manufacture does not present any particular difficulties for the person skilled in the art.

Claims (9)

  1. A method for continuously producing packages of groups of edgewise stacked items by means of an enveloping tube having a fin-type longitudinal seam and two transverse fins, wherein the items are conveyed to the tube folding means (4), where a packaging material (20) in the form of a tube is placed about a group of the items, wherein the foremost and rearmost item of the individual groups (3, 3') of items are held during a first transportation portion by rotating retainers (12, 11, 12', 11') of a first transportation means (1) guided around a downstream guide member (6) until the support is assumed by the tube as the second transportation means and wherein this tube (20) is further transported with the aid of tube conveying means (7, 8, 9), which are located in a region between a sealing device (10) and the tube folding means (4) characterised in that a negative pressure is produced in the tube (20) in advance of the tube conveying means (7, 8, 9) and at the guide member (6) of the first transportation means, in order to press the packaging material (20) against the edges of the items (3').
  2. A method according to claim 1, characterised in that the negative pressure is in the region of 300 Pa to 1000 Pa.
  3. A method according to claim 1 or 2, characterised in that the negative pressure varies in time with the machine.
  4. A method according to claim 3, characterised in that the changes in the negative pressure, which varies in time with the machine, amount to less than ± 100 Pa.
  5. A device for carrying out the method according to any one of claims 1 to 4, having a rotating retainer (12, 11, 12', 11', .....) for the purpose of holding the items upright and comprising the first transportation means (1) for the items, which is guided by way of a downstream guide member (6), having a tube folding means (4) for shaping a tube (20) around each group of these items, and having tube conveying means (7, 8, 9) for the further transportation of the tube (20) containing the groups, which are located in a region between a sealing device (10) and the tube folding means (4), characterised in that the guide member (6) is disposed in an intake chamber (5), which is connected to a negative pressure source (16) and that this intake chamber (6) is located in advance of the tube conveying means (7, 8, 9).
  6. A device according to claim 5, characterised in that the intake chamber (5) comprises in each case an opening (53;54) through which the rotating retainer (11,12'; 51, 52) move in and out.
  7. A device according to claim 6, characterised in that the guide device having an axis and guide wheel (6) is disposed in the intake chamber (5).
  8. A device according to claims 6 or 7, characterised in that the intake chamber (5) comprises a further opening having an adjustable closure device (18) and/or the intake device (15,16) comprises an adjustable restrictor (17).
  9. A device according to claim 8, characterised in that the closure device (18) and/or the restrictor (17) can be controlled by the two first openings (53, 54) in time with the passing through of the rotating retainers (11,12'; 51, 52) in such a way that the negative pressure in the intake chamber (5) is only subjected to small fluctuations.
EP90810340A 1989-05-24 1990-05-04 Method and device for continuously making packages Expired - Lifetime EP0399948B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1947/89 1989-05-24
CH194789 1989-05-24

Publications (2)

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EP0399948A1 EP0399948A1 (en) 1990-11-28
EP0399948B1 true EP0399948B1 (en) 1994-11-02

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EP90810340A Expired - Lifetime EP0399948B1 (en) 1989-05-24 1990-05-04 Method and device for continuously making packages

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US (1) US5052166A (en)
EP (1) EP0399948B1 (en)
JP (1) JPH0329712A (en)
BR (1) BR9002179A (en)
DE (1) DE59007596D1 (en)
ES (1) ES2062484T3 (en)

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US5052166A (en) 1991-10-01
EP0399948A1 (en) 1990-11-28
JPH0329712A (en) 1991-02-07
ES2062484T3 (en) 1994-12-16
DE59007596D1 (en) 1994-12-08
BR9002179A (en) 1991-08-13

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