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EP3328739B1 - Method for operating a vffs for producing bags with a ground-cross-seal and a different head-seal-shape - Google Patents

Method for operating a vffs for producing bags with a ground-cross-seal and a different head-seal-shape Download PDF

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Publication number
EP3328739B1
EP3328739B1 EP17751021.1A EP17751021A EP3328739B1 EP 3328739 B1 EP3328739 B1 EP 3328739B1 EP 17751021 A EP17751021 A EP 17751021A EP 3328739 B1 EP3328739 B1 EP 3328739B1
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EP
European Patent Office
Prior art keywords
transverse
seams
seam
draw
tubular
Prior art date
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EP17751021.1A
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German (de)
French (fr)
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EP3328739A1 (en
Inventor
Volker Dersch
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Rovema GmbH
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Rovema GmbH
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Publication of EP3328739A1 publication Critical patent/EP3328739A1/en
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Classifications

    • 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
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2042—Means for altering the cross-section of the tube filling opening prior to transversal sealing, e.g. tube spreading devices
    • 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
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • 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
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion

Definitions

  • the invention relates to a method for operating a tubular bag machine for the production of bags with a bottom cross seam and a different head transverse seam according to the preamble of claim 1.
  • tubular bags are known in which the bottom cross-seam is formed in a different way than the cross-head seam.
  • tubular bags are known in which the bottom cross seam is folded laterally to form, for example, a footprint, whereas the head cross seam is formed as a simple longitudinal cross-seam.
  • the tubular bags then differ in terms of the seams on the head or bottom.
  • a head transverse seam and a bottom transverse seam are produced in each work cycle by the biaxially driven transverse sealing jaws by a corresponding film welding process.
  • the head and bottom transverse seams produced in this way delimit neighboring tubular bags from one another, so that the Formation of the individual bags then with a separator, such as a cutting knife, the film must be severed between the commonly produced bottom and top cross seams.
  • the inventive method is first of all characterized in that on the inside of the film web a Faltform Georgia is stationary, which cooperates in the formation of the gusset with the movable sofalter.
  • the distance between the transverse sealing jaws and the fixed folding molding is different in the formation of the head transverse seams than in the formation of the floor transverse seams.
  • the minimum distance of the transverse sealing jaws to the fixed folding molded piece in the production of the two head transverse seams is significantly greater than the minimum distance between the transverse sealing jaws and the folding shaped piece in the production of the floor cross seams.
  • the travel of the transverse sealing jaws is varied depending on whether two head transverse seams or two bottom transverse seams are to be sealed in the next working cycle. Nonetheless, most production processes require the production of tubular bags each having a constant height between bottom cross seam and head cross seam. In order to realize this constant bag length of all sealed bags in a simple manner, is provided by a preferred method variant that the Abzugsgeschwindigeit the trigger in the formation of a first bag a first speed profile, the Abzugsgeschwindigeit the trigger in the formation of an immediately following second tubular bag a thereof corresponds to different second velocity profile.
  • the speed profile of the take-off speed is alternately changed in this preferred process variant.
  • the process according to the invention is basically arbitrary.
  • the process according to the invention is particularly important in the manufacture of tubular bags, in which strip-shaped closing elements which can be brought into releasable engagement in the region of the head transverse seam are fastened transversely to the longitudinal axis of the film web. Because in this type of tubular bags, the production with different head cross seams and bottom cross seams is essential if in the area of the bottom cross seam, a footprint is desired.
  • Fig. 1 is shown in side view an embodiment of a tubular bag 01 produced by the method according to the invention.
  • the tubular bag 01 in this case has a folded bottom cross seam 02 and a non-folded head cross seam 03.
  • the film web 04 is longitudinally sealed with a longitudinal sealing device along a longitudinal seam 05 before filling and prior to the production of the transverse seams 02 and 03. Due to the folded bottom cross seam 02, a base can be formed on the bottom 06 of the tubular bag 01.
  • strip-like closing elements 07 and 08 which can be brought into releasable engagement, can be seen, which enable re-closing of the tubular bag 01 opened by the user after the head cross-seam has been removed.
  • Fig. 2 shows the tubular bag 01 in cross section along the section line II. It can be seen that the tubular bag 01 is not folded in the area below the head cross seam 03.
  • Fig. 3 represents the tubular bag 01 along the section line II-II.
  • the film web 04 is laterally folded at two side folds 09, thereby forming an at least slight footing on the bottom 06.
  • Fig. 4 shows several tubular bag 01 produced by the method according to the invention, wherein in the illustration according to FIG Fig. 4 the separation of the individual tubular bag 01 after filling and sealing is not shown.
  • the closing elements 07 and 08 are in Fig. 4 not shown.
  • the respective adjacent tubular bag 01 are sealed in such a way that either the two adjacent bottom transverse seams 02 and in the next working cycle the two adjacent head transverse seams 03 are sealed with the transverse sealing jaws. This is required to each alternately fold laterally the film tube formed from the film web 04, whereupon then the bottom cross seams 02 are sealed and then renounce in each successive working cycle on a folding of the film web and to seal the unfolded head transverse seams 03.
  • the inventive method for producing the tubular bag 01 is based on the representation in Fig. 5 and Fig. 6 be explained in more detail.
  • tubular bag machine 10 has a frame 11, at its upper portion a forming shoulder 12 is arranged, via which the band-like film web 04 is passed to form a longitudinal tube.
  • the film web 04 is formed in the longitudinal direction, wherein the outer edges are arranged overlapping, to subsequently welded together to form the longitudinal seam 05 to each other.
  • the welding of the film web edges takes place by means of a longitudinally welded device 13, which is shown only schematically and which is arranged in the longitudinal direction on the outside of a filling tube 14. Due to the refolding of the film web 04 in the region of the forming shoulder 12 and the welding by the longitudinal welding device 13, a basically endless film tube is thus formed, which encloses the filling tube 14.
  • two take-off belts 15, which are driven longitudinally adjacent to the filling tube 14, the film web 04 or the endless tube formed therefrom is moved downwards.
  • a biaxially driven transverse welding device 16 is arranged below the filling tube 14 .
  • the two transverse sealing jaws 17 can be driven in the Z direction, ie in the conveying direction of the tubular bag 01, and toward one another, ie transversely to the conveying direction.
  • the transverse sealing jaws 17 are pressed against each other and the film web 14th welded by heat.
  • the transverse sealing jaws 17 of the transverse sealing device 16 are moved in the Z direction in order to follow the conveying movement of the tubular bag 01 from top to bottom.
  • Fig. 5 shows the tubular bag machine 10 in the sealing of two folded bottom transverse seams, wherein, as shown in FIG Fig. 5 the transverse sealing jaws 17 of the transverse sealing device 16 occupy their highest point in the Z direction.
  • the two side folders 18 cooperate with a folding form 19 arranged on the inside of the film web 04.
  • the folding form 19 is mounted in the extension of the filling tube 14, wherein the cross section of the Faltform Cultures 19 just the desired wrinkling by retracting the Sofalter 18 corresponds.
  • Fig. 6 the bagger 10 is shown during the next working cycle to form two unfolded head transverse seams 03.
  • the transverse sealing device 16 with the transverse sealing jaws 17 takes in accordance with the illustration in Fig. 6 their highest point during the round. It can be seen that the transverse sealing jaws 17 when moving together the seal of the un-folded head transverse seams 03 with respect to the Faltform Georgia 19 has a greater distance 20. By this additional distance 20 of the transverse sealing jaws 17 for Faltform Georgia 19 at the start of sealing to seal the two head transverse seams 03 is an undesirable wrinkling in the region of the head transverse seams 03, as otherwise caused by the Faltform fabrics 19 avoided.
  • the sofalter 18 are during the working cycle for sealing the two head transverse seams 03 out of engagement of the film web 04th
  • the withdrawal speed of the two discharge belts 15 is varied.
  • the take-off speed of the take-off belts 15 the change in distance, i. the variation of the Z coordinates of the transverse sealing jaws 17 at the beginning of sealing of the bottom transverse seams 02 on the one hand and the head transverse seams 03 on the other hand are compensated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Making Paper Articles (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer Schlauchbeutelmaschine zur Herstellung von Beuteln mit einer Boden-Quernaht und einer davon unterschiedlichen Kopf-Quernaht nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for operating a tubular bag machine for the production of bags with a bottom cross seam and a different head transverse seam according to the preamble of claim 1.

Für verschiedene Verpackungsaufgaben in der Verpackungsindustrie sind Schlauchbeutel bekannt, bei denen die Boden-Quernaht in anderer Weise ausgebildet ist als die Kopf-Quernaht. So sind beispielsweise Schlauchbeutel bekannt, bei denen die Boden-Quernaht seitlich eingefaltet wird, um beispielsweise eine Standfläche auszubilden, wohingegen die Kopf-Quernaht als einfache Längs-Quernaht ausgebildet ist. Die Schlauchbeutel unterscheiden sich dann also hinsichtlich der Verschlussnähte an Kopf bzw. Boden.For various packaging tasks in the packaging industry, tubular bags are known in which the bottom cross-seam is formed in a different way than the cross-head seam. For example, tubular bags are known in which the bottom cross seam is folded laterally to form, for example, a footprint, whereas the head cross seam is formed as a simple longitudinal cross-seam. The tubular bags then differ in terms of the seams on the head or bottom.

Bei konventionellen Herstellungsverfahren zur Herstellung von Schlauchbeuteln werden bei jedem Arbeitstakt durch die zweiachsig antreibbaren Quersiegelbacken jeweils eine Kopf-Quernaht und eine Boden-Quernaht durch ein entsprechendes Folienschweißverfahren hergestellt. Die so hergestellten Kopf- und Boden-Quernähte grenzen voneinander benachbarte Schlauchbeutel voneinander ab, so dass zur Bildung der einzelnen Beutel dann mit einer Trenneinrichtung, beispielsweise einem Schneidmesser, die Folie zwischen den gemeinsam hergestellten Boden- und Kopf-Quernähten durchtrennt werden muss.In conventional manufacturing processes for the production of tubular bags, a head transverse seam and a bottom transverse seam are produced in each work cycle by the biaxially driven transverse sealing jaws by a corresponding film welding process. The head and bottom transverse seams produced in this way delimit neighboring tubular bags from one another, so that the Formation of the individual bags then with a separator, such as a cutting knife, the film must be severed between the commonly produced bottom and top cross seams.

Sollen Schlauchbeutel hergestellt werden, bei denen sich die Boden-Quernaht von der Kopf-Quernaht unterscheidet, nämlich eingefaltet ist, ist die gemeinsame Herstellung einer Boden-Quernaht und einer Kopf-Quernaht während eines einzelnen Arbeitstaktes der Quersiegelbacken nicht möglich, da bei der Herstellung der Boden-Quernaht die Folie des Schlauchbeutels eingefaltet werden muss, wohingegen die Herstellung der Kopf-Quernaht das Einfalten der Folie verbietet.If tubular bags are to be produced in which the bottom cross seam differs from the cross head seam, namely folded in, the joint production of a bottom cross seam and a head cross seam during a single working cycle of the transverse sealing jaws is not possible since in the production of the Bottom-cross seam, the film of the tubular bag must be folded, whereas the production of the head cross seam prohibits the folding of the film.

Um solche Schlauchbeutel mit voneinander unterschiedlichen Boden-Quernähten und Kopf-Quernähten herstellen zu können, ist aus der DE 38 24 753 A1 ein Herstellungsverfahren bekannt, wobei jeweils zwei Boden-Quernähte von benachbarten Beuteln in einem ersten Arbeitsgang der Quersiegelbacken ausgebildet werden und daran anschließend in einem zweiten Arbeitsgang jeweils zwei Kopf-Quernähte. Bei diesem Verfahren ergibt es sich, dass die einzelnen Beutel in Abzugsrichtung des Schlauchs mit alternierender Ausrichtung hergestellt werden, so dass jeweils benachbarte Beutel alternierend entweder mit der Kopf-Quernaht oder mit der Boden-Quernaht vorausgesiegelt werden.In order to produce such tubular bag with mutually different bottom cross-seams and cross-head seams, is from the DE 38 24 753 A1 a manufacturing method is known, wherein in each case two bottom transverse seams of adjacent bags are formed in a first operation of the transverse sealing jaws and subsequently in a second operation in each case two head transverse seams. In this method, it turns out that the individual bags are made in the withdrawal direction of the tube with alternating orientation, so that each adjacent bags are alternately vorgesiegelt either with the head cross seam or with the bottom cross seam.

Bei der Herstellung von Schlauchbeuteln mit eingefalteter Boden-Quernaht ist der Einsatz so genannter Seitenfalter erforderlich, mit denen die Folie vor dem Verschweißen der Boden-Quernaht in der gewünschten Weise zur Bildung einer Seitenfalte seitlich eingefaltet wird. Die Qualität der Seitenfalte wird dabei erheblich dadurch verbessert, wenn der Seitenfalter bei der Bildung der eingefalteten Boden-Quernähte mit einem feststehenden, auf der Innenseite angeordneten Faltformstück (Schute) zusammenwirkt. Durch das Zusammenwirken des Seitenfalters mit dem Faltenformstück wird die Folie im Bereich der Seitenfalte optimal geführt und kann sich in der gewünschten Weise einfalten. Die Verwendung von Faltformstücken auf der Innenseite der Folienbahn bei der Ausbildung der Seitenfalte wirft jedoch bei der Herstellung von Schlauchbeuteln mit unterschiedlichen Quernähten an Kopf und Boden erhebliche Probleme auf. Denn bei diesen Verfahren werden mit den Quersiegelbacken abwechselnd zwei Bodenquernähte und dann zwei Kopf-Quernähte hergestellt. Beim Siegeln der eingefalteten Boden-Quernähte ist es dabei wünschenswert, dass die Quersiegelbacken einen besonders geringen Abstand zum Faltformstück aufweisen, um eine optimale Faltenbildung zu gewährleisten. Umgekehrt ist ein zu geringer Abstand der Quersiegelbacken zum Faltformstück beim Siegeln der nicht eingefalteten Kopf-Quernaht von großem Nachteil, da sich bei einem zu geringen Abstand der Quersiegelbacken zum innenliegenden Faltformstück unerwünschte Falten in der nicht eingefalteten Kopf-Quernaht bilden können. Bei den bekannten Verfahren zum Betrieb einer Schlauchbeutelmaschine zur Herstellung von Beuteln mit eingefalteter Boden-Quernaht und nicht eingefalteter Kopf-Quernaht wurde deshalb auf die Verwendung von innenliegenden Faltformstücken verzichtet, was jedoch die Faltqualität beim Einfalten der Seitenfalte negativ beeinflusst.In the manufacture of tubular bags with folded bottom cross seam, the use of so-called lateral butterflies is required, with which the film is folded laterally before the welding of the bottom cross seam in the desired manner to form a gusset. The quality of the gusset is thereby significantly improved if the side moth cooperates with the formation of the folded bottom transverse seams with a fixed, arranged on the inside Faltformstück (barge). Due to the interaction of the side sill with the folding mold, the film is optimally guided in the area of the gusset and can fold in the desired manner. The use of Faltformstücken on the inside of the film web at However, the formation of the gusset poses considerable problems in the production of tubular bags with different cross-seams at the top and bottom. Because with these methods, two bottom cross seams and then two cross head seams are produced alternately with the transverse sealing jaws. When sealing the folded bottom transverse seams, it is desirable that the transverse sealing jaws have a particularly small distance from the folding fitting in order to ensure optimum wrinkling. Conversely, too small a distance of the transverse sealing jaws for Faltformstück when sealing the unfolded head transverse seam of great disadvantage, since at too small a distance of the transverse sealing jaws to the inner Faltformstück unwanted wrinkles in the unfolded head transverse seam can form. In the known method for operating a tubular bag machine for the production of bags with folded bottom cross seam and unfolded head cross seam was therefore dispensed with the use of internal Faltformstücken, but this adversely affects the folding quality when folding the gusset.

Ausgehend von diesem Stand der Technik ist es deshalb Aufgabe der vorliegenden Erfindung, ein neues Verfahren zum Betrieb einer Schlauchbeutelmaschine zur Herstellung von Beuteln mit eingefalteter Boden-Quernaht und nicht eingefalteter Kopf-Quernaht vorzuschlagen, bei dem eine optimale Faltenqualität bei der Bildung der Seitenfalte erreicht wird und zugleich eine problemlose Siegelung der nicht eingefalteten Kopf-Quernaht ermöglicht wird.Based on this prior art, it is therefore an object of the present invention to provide a new method for operating a tubular bag machine for the production of bags with folded bottom cross seam and not folded head cross seam, in which an optimal wrinkle quality is achieved in the formation of the gusset and at the same time a trouble-free sealing of the un-folded head cross seam is made possible.

Diese Aufgabe wird durch ein Verfahren nach der Lehre des Anspruchs 1 gelöst.This object is achieved by a method according to the teaching of claim 1.

Vorteilhafte Ausführungsformen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Das erfindungsgemäße Verfahren ist zunächst einmal dadurch charakterisiert, dass auf der Innenseite der Folienbahn ein Faltformstück feststehend angeordnet ist, das bei der Bildung der Seitenfalte mit dem verfahrbaren Seitenfalter zusammenwirkt. Um die unerwünschte Faltenbildung im Bereich der an sich nicht einzufaltenden Kopf-Quernähte zu vermeiden, ist erfindungsgemäß vorgesehen, dass der Abstand der Quersiegelbacken zu dem feststehenden Faltformstück bei der Ausbildung der Kopf-Quernähte ein anderer ist als bei der Ausbildung der Boden-Quernähte. Dies bedeutet also mit anderen Worten, dass die Quersiegelbacken jeweils abhängig davon, ob mit den Quersiegelbacken zwei Kopf-Quernähte oder zwei Boden-Quernähte gesiegelt werden, in eine andere Position entlang der Z-Achse verfahren werden.The inventive method is first of all characterized in that on the inside of the film web a Faltformstück is stationary, which cooperates in the formation of the gusset with the movable Seitenfalter. In order to avoid the undesirable formation of wrinkles in the region of the head transverse seams which are not to be folded in, it is provided according to the invention that the distance between the transverse sealing jaws and the fixed folding molding is different in the formation of the head transverse seams than in the formation of the floor transverse seams. In other words, this means that the transverse sealing jaws are each moved into a different position along the Z axis, depending on whether two head transverse seams or two bottom transverse seams are sealed with the transverse sealing jaws.

Der minimale Abstand der Quersiegelbacken zum feststehenden Faltformstück bei der Herstellung der beiden Kopf-Quernähte ist dabei signifikant größer als der minimale Abstand der Quersiegelbacken zum Faltformstück bei der Herstellung der Boden-Quernähte. Durch den dadurch erreichten zusätzlichen Abstand der Quersiegelbacken zu dem feststehenden Faltformstück während des Siegelns der Kopf-Quernähte wird die unerwünschte Faltenbildung im Bereich der Kopf-Quernähte - verursacht durch das Faltformstück - weitgehend verringert bzw. gänzlich vermieden. Beim Siegeln der Boden-Quernähte wird dagegen ein geringerer minimaler Abstand der Quersiegelbacken zum Faltformstück vorgesehen, so dass die Funktionen der seitlich beweglichen Seitenfalter beim Einfalten der Folie im Bereich der Boden-Quernaht durch das feststehende Faltformstück optimal unterstützt werden kann. Dies bedeutet also mit anderen Worten, dass die Quersiegelvorrichtung auf ihrer geschlossenen zweiachsigen Bewegungsbahn bei der Herstellung der Boden-Quernähte eine höhere Position anfährt als bei der Herstellung der Kopf-Quernähte, soweit die Abzugsrichtung vertikal nach unten gerichtet ist.The minimum distance of the transverse sealing jaws to the fixed folding molded piece in the production of the two head transverse seams is significantly greater than the minimum distance between the transverse sealing jaws and the folding shaped piece in the production of the floor cross seams. By thus achieved additional distance of the transverse sealing jaws to the fixed Faltformstück during the sealing of the head transverse seams unwanted wrinkling in the area of the head transverse seams - caused by the Faltformstück - largely reduced or completely avoided. When sealing the bottom transverse seams, however, a lesser minimum distance between the transverse sealing jaws is provided for Faltformstück so that the functions of the laterally movable Seitenfalter can be optimally supported by the fixed Faltformstück when folding the film in the bottom cross-seam. In other words, this means that the transverse sealing device on its closed biaxial trajectory in the production of bottom cross seams anfährt a higher position than in the production of the head transverse seams, as far as the withdrawal direction is directed vertically downwards.

Bei dem erfindungsgemäßen Verfahren wird der Verfahrweg der Quersiegelbacken abhängig davon variiert, ob im nächsten Arbeitstakt zwei Kopf-Quernähte oder zwei Boden-Quernähte gesiegelt werden sollen. Nichtsdestotrotz erfordern die meisten Produktionsprozesse die Herstellung von Schlauchbeuteln mit jeweils konstanter Höhe zwischen Boden-Quernaht und Kopf-Quernaht. Um diese konstante Beutellänge aller gesiegelten Beutel in einfacher Weise zu realisieren, ist nach einer bevorzugten Verfahrensvariante vorgesehen, dass die Abzugsgeschwindigeit der Abzugsvorrichtung bei der Ausbildung eines ersten Schlauchbeutels einem ersten Geschwindigkeitsprofil entspricht, wobei die Abzugsgeschwindigeit der Abzugsvorrichtung bei der Ausbildung eines unmittelbar nachfolgenden zweiten Schlauchbeutels einem davon unterschiedlichen zweiten Geschwindigkeitsprofil entspricht. Anders als bei konventionellen Schlauchbeutelherstellungsverfahren, bei denen die Abzugsgeschwindigkeit der Folienbahn für alle Schlauchbeutel dem gleichen Geschwindigkeitsprofil folgt, wird also das Geschwindigkeitsprofil der Abzugsgeschwindigkeit bei dieser bevorzugten Verfahrensvariante alternierend geändert. Durch diese abwechselnde Änderung des Geschwindigkeitsprofils der Abzugsgeschwindigkeit ist es möglich, die Änderung des minimalen Abstands der Quersiegelbacken zum Faltformstück dahingehend zu kompensieren, dass die Beutellänge aller gesiegelten Beutel im Wesentlichen konstant ist.In the method according to the invention, the travel of the transverse sealing jaws is varied depending on whether two head transverse seams or two bottom transverse seams are to be sealed in the next working cycle. Nonetheless, most production processes require the production of tubular bags each having a constant height between bottom cross seam and head cross seam. In order to realize this constant bag length of all sealed bags in a simple manner, is provided by a preferred method variant that the Abzugsgeschwindigeit the trigger in the formation of a first bag a first speed profile, the Abzugsgeschwindigeit the trigger in the formation of an immediately following second tubular bag a thereof corresponds to different second velocity profile. In contrast to conventional tubular bag production processes in which the take-off speed of the film web follows the same speed profile for all tubular bags, the speed profile of the take-off speed is alternately changed in this preferred process variant. By this alternating change in the speed profile of the take-off speed, it is possible to compensate for the change in the minimum distance of the cross-seal jaws from the fold mold such that the bag length of all sealed bags is substantially constant.

Dabei ist es besonders vorteilhaft, wenn die Abzugsgeschwindigkeit, mit der die Folienbahn in Längsrichtung abgezogen wird, bei der Ausbildung von benachbarten Beuteln zwischen einem Geschwindigkeitsmaximum und einem Geschwindigkeitsminimum alternierend verändert wird. Durch diese Variation der Abzugsgeschwindigkeit ist es besonders einfach möglich, die Änderung des minimalen Abstands der Quersiegelbacken zum Faltformstück dahingehend zu kompensieren, dass die Beutellänge aller gesiegelten Beutel im Wesentlichen konstant ist.It is particularly advantageous if the withdrawal speed at which the film web is withdrawn in the longitudinal direction, is alternately changed in the formation of adjacent bags between a maximum speed and a minimum speed. By this variation of the take-off speed, it is particularly easy to compensate for the change in the minimum distance between the transverse sealing jaws and the folding-shaped piece in such a way that the bag length of all sealed bags is substantially constant.

Für welche Art von Schlauchbeuteln das erfindungsgemäße Verfahren eingesetzt wird, ist grundsätzlich beliebig. Besonders große Bedeutung hat das erfindungsgemäße Verfahren bei der Herstellung von Schlauchbeuteln, bei denen im Bereich der Kopf-Quernaht jeweils streifenförmige, miteinander in lösbarem Eingriff bringbare Verschließelemente quer zur Längsachse der Folienbahn befestigt sind. Denn bei dieser Art von Schlauchbeuteln ist die Herstellung mit unterschiedlichen Kopf-Quernähten und Boden-Quernähten unerlässlich, wenn im Bereich der Boden-Quernaht eine Standfläche gewünscht wird.For which type of tubular bags the process according to the invention is used is basically arbitrary. The process according to the invention is particularly important in the manufacture of tubular bags, in which strip-shaped closing elements which can be brought into releasable engagement in the region of the head transverse seam are fastened transversely to the longitudinal axis of the film web. Because in this type of tubular bags, the production with different head cross seams and bottom cross seams is essential if in the area of the bottom cross seam, a footprint is desired.

Eine Variante des erfindungsgemäßen Verfahrens wird anhand der schematischen Zeichnungen nachfolgend beispielhaft erläutert.A variant of the method according to the invention is explained below by way of example with reference to the schematic drawings.

Es zeigen:

Fig. 1
einen Schlauchbeutel mit einer eingefalteten Boden-Quernaht und einer nicht eingefalteten Kopf-Quernaht in seitlicher Ansicht;
Fig. 2
den Schlauchbeutel gemäß Fig. 1 im Querschnitt entlang der Schnittlinie I-I;
Fig. 3
den Schlauchbeutel gemäß Fig. 1 in einem Querschnitt entlang der Schnittlinie II-II;
Fig. 4
eine Seitenansicht mehrerer nach dem erfindungsgemäßen Verfahren hergestellter Schlauchbeutel ohne Durchtrennung;
Fig. 5
eine schematische Seitenansicht einer Schlauchbeutelmaschine mit zweiachsig antreibbaren Quersiegelbacken während des Siegelns der beiden eingefalteten Boden-Quernähte zweier benachbarter Schlauchbeutel;
Fig. 6
die Schlauchbeutelmaschine gemäß Fig. 5 während des Siegelns der benachbarten, nicht eingefalteten Kopf-Quernähte zweier benachbarter Schlauchbeutel in seitlicher Ansicht.
Show it:
Fig. 1
a tubular bag with a folded bottom cross seam and a non-folded head cross seam in a side view;
Fig. 2
the tubular bag according to Fig. 1 in cross-section along the section line II;
Fig. 3
the tubular bag according to Fig. 1 in a cross section along the section line II-II;
Fig. 4
a side view of several produced by the process according to the invention tubular bag without transection;
Fig. 5
a schematic side view of a tubular bag machine with biaxially driven transverse sealing jaws during the sealing of the two folded bottom transverse seams of two adjacent tubular bag;
Fig. 6
the flow wrapper according to Fig. 5 during the sealing of the adjacent, un-folded head transverse seams of two adjacent tubular bags in a lateral view.

In Fig. 1 ist in Seitenansicht ein Ausführungsbeispiel eines mit dem erfindungsgemäßen Verfahren hergestellten Schlauchbeutels 01 dargestellt. Der Schlauchbeutel 01 weist dabei eine eingefaltete Boden-Quernaht 02 und eine nicht eingefaltete Kopf-Quernaht 03 auf. Zur Bildung eines endlosen Längsschlauchs aus einer Folienbahn wird die Folienbahn 04 mit einer Längssiegeleinrichtung entlang einer Längsnaht 05 vor der Befüllung und vor der Herstellung der Quernähte 02 und 03 längsgesiegelt. Durch die eingefaltete Boden-Quernaht 02 kann am Boden 06 des Schlauchbeutels 01 eine Standfläche gebildet werden. Im Bereich der nicht eingefalteten Kopf-Quernaht 03 nämlich direkt unterhalb der Kopf-Quernaht 03 sind streifenförmige, miteinander in lösbarem Eingriff bringbare Verschließelemente 07 und 08 erkennbar, die ein Wiederverschließen des nach Entfernen der Kopf-Quernaht durch den Benutzer geöffneten Schlauchbeutels 01 ermöglichen.In Fig. 1 is shown in side view an embodiment of a tubular bag 01 produced by the method according to the invention. The tubular bag 01 in this case has a folded bottom cross seam 02 and a non-folded head cross seam 03. To form an endless longitudinal tube from a film web, the film web 04 is longitudinally sealed with a longitudinal sealing device along a longitudinal seam 05 before filling and prior to the production of the transverse seams 02 and 03. Due to the folded bottom cross seam 02, a base can be formed on the bottom 06 of the tubular bag 01. In the area of the unfolded head transverse seam 03, namely directly underneath the head transverse seam 03, strip-like closing elements 07 and 08, which can be brought into releasable engagement, can be seen, which enable re-closing of the tubular bag 01 opened by the user after the head cross-seam has been removed.

Fig. 2 zeigt den Schlauchbeutel 01 im Querschnitt entlang der Schnittlinie I-I. Man erkennt, dass der Schlauchbeutel 01 im Bereich unterhalb der Kopf-Quernaht 03 nicht eingefaltet ist. Fig. 2 shows the tubular bag 01 in cross section along the section line II. It can be seen that the tubular bag 01 is not folded in the area below the head cross seam 03.

Fig. 3 stellt den Schlauchbeutel 01 entlang der Schnittlinie II-II dar. In diesem Bereich ist die Folienbahn 04 an zwei Seitenfalten 09 seitlich eingefaltet, um dadurch am Boden 06 eine zumindest geringfügige Standfläche zu bilden. Fig. 3 represents the tubular bag 01 along the section line II-II. In this area, the film web 04 is laterally folded at two side folds 09, thereby forming an at least slight footing on the bottom 06.

Fig. 4 zeigt mehrere mit dem erfindungsgemäßen Verfahren hergestellte Schlauchbeutel 01, wobei in der Darstellung gemäß Fig. 4 die Durchtrennung der einzelnen Schlauchbeutel 01 nach dem Befüllen und Versiegeln nicht dargestellt ist. Auch die Verschließelemente 07 und 08 sind in Fig. 4 nicht dargestellt. Fig. 4 shows several tubular bag 01 produced by the method according to the invention, wherein in the illustration according to FIG Fig. 4 the separation of the individual tubular bag 01 after filling and sealing is not shown. The closing elements 07 and 08 are in Fig. 4 not shown.

Die jeweils benachbarten Schlauchbeutel 01 werden derart gesiegelt, dass entweder jeweils die beiden benachbarten Boden-Quernähte 02 und im nächsten Arbeitstakt die beiden benachbarten Kopf-Quernähte 03 mit den Quersiegelbacken gesiegelt werden. Dies ist erforderlich, um jeweils alternierend den aus der Folienbahn 04 gebildeten Folienschlauch seitlich einzufalten, woraufhin dann die Bodenquernähte 02 gesiegelt werden und dann im jeweils darauf folgenden Arbeitstakt auf ein Einfalten der Folienbahn zu verzichten und die nicht eingefalteten Kopf-Quernähte 03 zu siegeln.The respective adjacent tubular bag 01 are sealed in such a way that either the two adjacent bottom transverse seams 02 and in the next working cycle the two adjacent head transverse seams 03 are sealed with the transverse sealing jaws. This is required to each alternately fold laterally the film tube formed from the film web 04, whereupon then the bottom cross seams 02 are sealed and then renounce in each successive working cycle on a folding of the film web and to seal the unfolded head transverse seams 03.

Das erfindungsgemäße Verfahren zur Herstellung der Schlauchbeutel 01 soll anhand der Darstellung in Fig. 5 und Fig. 6 näher erläutert werden.The inventive method for producing the tubular bag 01 is based on the representation in Fig. 5 and Fig. 6 be explained in more detail.

Die in Fig. 5 gezeigte Schlauchbeutelmaschine 10 weist einen Rahmen 11 auf, an dessen oberen Bereich eine Formschulter 12 angeordnet ist, über welche die bandartige Folienbahn 04 zur Bildung eines Längsschlauchs geleitet wird. Im Bereich der Formschulter 12 wird die Folienbahn 04 in Längsrichtung geformt, wobei die äußeren Ränder überlappend angeordnet werden, um diese nachfolgend unter Bildung der Längsnaht 05 miteinander zur verschweißen. Die Verschweißung der Folienbahnränder erfolgt mittels einer lediglich schematisch dargestellten Längsschweißeinrichtung 13, die in Längsrichtung an der Außenseite eine Füllrohrs 14 angeordnet ist. Bedingt durch die Umfaltung der Folienbahn 04 im Bereich der Formschulter 12 und die Verschweißung durch die Längsschweißeinrichtung 13 wird somit ein im Prinzip endloser Folienschlauch ausgebildet, der das Füllrohr 14 umschließt. Mittels zweier Abzugsbänder 15, welche längs am Füllrohr 14 anliegend angetrieben werden, wird die Folienbahn 04 bzw. der daraus gebildete Endlosschlauch nach unten bewegt.In the Fig. 5 shown tubular bag machine 10 has a frame 11, at its upper portion a forming shoulder 12 is arranged, via which the band-like film web 04 is passed to form a longitudinal tube. In the region of the forming shoulder 12, the film web 04 is formed in the longitudinal direction, wherein the outer edges are arranged overlapping, to subsequently welded together to form the longitudinal seam 05 to each other. The welding of the film web edges takes place by means of a longitudinally welded device 13, which is shown only schematically and which is arranged in the longitudinal direction on the outside of a filling tube 14. Due to the refolding of the film web 04 in the region of the forming shoulder 12 and the welding by the longitudinal welding device 13, a basically endless film tube is thus formed, which encloses the filling tube 14. By means of two take-off belts 15, which are driven longitudinally adjacent to the filling tube 14, the film web 04 or the endless tube formed therefrom is moved downwards.

Durch das Füllrohr 14 wird in nicht dargestellter Weise Füllgut geschüttet, das aus dem Füllrohr 14 austritt und in den Innenraum des Folienschlauchs gelangt. Unterhalb des Füllrohrs 14 ist eine zweiachsig antreibbare Querschweißvorrichtung 16 angeordnet. Die beiden Quersiegelbacken 17 können in Z-Richtung, d.h. in Förderrichtung der Schlauchbeutel 01, und aufeinander zu, d.h. quer zur Förderrichtung angetrieben werden. Beim Siegeln der Schlauchbeutel 01 werden die Quersiegelbacken 17 gegeneinander gepresst und die Folienbahn 14 durch Wärmeeinwirkung verschweißt. Zeitgleich werden die Quersiegelbacken 17 der Quersiegelvorrichtung 16 in Z-Richtung verfahren, um der Förderbewegung der Schlauchbeutel 01 von oben nach unten zu folgen.Through the filling tube 14 in a manner not shown filling material is poured, which exits from the filling tube 14 and enters the interior of the film tube. Below the filling tube 14 a biaxially driven transverse welding device 16 is arranged. The two transverse sealing jaws 17 can be driven in the Z direction, ie in the conveying direction of the tubular bag 01, and toward one another, ie transversely to the conveying direction. When sealing the tubular bag 01, the transverse sealing jaws 17 are pressed against each other and the film web 14th welded by heat. At the same time, the transverse sealing jaws 17 of the transverse sealing device 16 are moved in the Z direction in order to follow the conveying movement of the tubular bag 01 from top to bottom.

Fig. 5 zeigt die Schlauchbeutelmaschine 10 bei der Siegelung zweier eingefalteter Boden-Quernähte, wobei gemäß der Darstellung von Fig. 5 die Quersiegelbacken 17 der Quersiegelvorrichtung 16 ihren höchsten Punkt in Z-Richtung einnehmen. Zur Bildung der Seitenfalten 09 im Bereich der zu siegelnden Boden-Quernähte 02 werden seitlich verfahrbare Seitenfalter 18 verwendet, die quer zur Förderrichtung der Schlauchbeutel 01 gegen die Folienbahn 04 gedrückt werden. Um eine optimale Faltenbildung zu realisieren, wirken die beiden Seitenfalter 18 mit einem auf der Innenseite der Folienbahn 04 angeordneten Faltformstück 19 zusammen. Das Faltformstück 19 ist in der Verlängerung des Füllrohrs 14 angebracht, wobei der Querschnitt des Faltformstücks 19 grade der gewünschten Faltenbildung durch Einfahren der Seitenfalter 18 entspricht. Fig. 5 shows the tubular bag machine 10 in the sealing of two folded bottom transverse seams, wherein, as shown in FIG Fig. 5 the transverse sealing jaws 17 of the transverse sealing device 16 occupy their highest point in the Z direction. To form the gussets 09 in the area to be sealed bottom cross seams 02 laterally movable Seitenfalter 18 are used, which are pressed transversely to the conveying direction of the tubular bag 01 against the film web 04. In order to realize optimum wrinkling, the two side folders 18 cooperate with a folding form 19 arranged on the inside of the film web 04. The folding form 19 is mounted in the extension of the filling tube 14, wherein the cross section of the Faltformstücks 19 just the desired wrinkling by retracting the Seitenfalter 18 corresponds.

In Fig. 6 ist die Schlauchbeutelmaschine 10 während des nächsten Arbeitstakts zur Bildung zweier nicht eingefalteter Kopf-Quernähte 03 dargestellt. Die Quersiegelvorrichtung 16 mit den Quersiegelbacken 17 nimmt dabei gemäß der Darstellung in Fig. 6 ihren höchsten Punkt während des Umlaufs ein. Man erkennt, dass die Quersiegelbacken 17 beim Zusammenfahren der Siegelung der nicht eingefalteten Kopf-Quernähte 03 gegenüber dem Faltformstück 19 einen größeren Abstand 20 aufweist. Durch diesen zusätzlichen Abstand 20 der Quersiegelbacken 17 zum Faltformstück 19 beim Siegelbeginn zur Siegelung der beiden Kopf-Quernähte 03 wird eine unerwünschte Faltenbildung im Bereich der Kopf-Quernähte 03, wie sie sonst durch das Faltformstück 19 verursacht wurde, vermieden. Die Seitenfalter 18 sind während des Arbeitstakts zur Siegelung der beiden Kopf-Quernähte 03 außer Eingriff der Folienbahn 04.In Fig. 6 the bagger 10 is shown during the next working cycle to form two unfolded head transverse seams 03. The transverse sealing device 16 with the transverse sealing jaws 17 takes in accordance with the illustration in Fig. 6 their highest point during the round. It can be seen that the transverse sealing jaws 17 when moving together the seal of the un-folded head transverse seams 03 with respect to the Faltformstück 19 has a greater distance 20. By this additional distance 20 of the transverse sealing jaws 17 for Faltformstück 19 at the start of sealing to seal the two head transverse seams 03 is an undesirable wrinkling in the region of the head transverse seams 03, as otherwise caused by the Faltformstück 19 avoided. The Seitenfalter 18 are during the working cycle for sealing the two head transverse seams 03 out of engagement of the film web 04th

Um den zusätzlichen Abstand 20 zum Siegelbeginn der Siegelung zur Herstellung der beiden Kopf-Quernähte im Hinblick auf die Beutellänge zu kompensieren, wird die Abzugsgeschwindigkeit der beiden Abzugsbänder 15 variiert. Durch die Variation der Abzugsgeschwindigkeit der Abzugsbänder 15 kann die Abstandsänderung, d.h. die Variation der Z-Koordinaten der Quersiegelbacken 17 bei Siegelbeginn der Boden-Quernähte 02 einerseits bzw. der Kopf-Quernähte 03 andererseits ausgeglichen werden.In order to compensate for the additional distance 20 to the seal start of the seal for the production of the two head transverse seams with respect to the bag length, the withdrawal speed of the two discharge belts 15 is varied. By varying the take-off speed of the take-off belts 15, the change in distance, i. the variation of the Z coordinates of the transverse sealing jaws 17 at the beginning of sealing of the bottom transverse seams 02 on the one hand and the head transverse seams 03 on the other hand are compensated.

Claims (4)

  1. A method for operating a tubular bag machine (10) having a biaxially drivable transverse sealing device (16) for producing tubular bags (01), a film sheet (04) being closed by means of a transverse bottom seam (02) and a transverse top seam (03) after having formed a film tube, at least an edge area of the film sheet (04) of the tubular bag (01) being folded at the side so as to form a side fold (09) using a side folder (18), which is moveable transversally to the longitudinal axis of the film sheet (04), before the transverse bottom seam is formed, and two transverse bottom seams (02) of adjacent tubular bags (01) being formed in one work step of the transverse sealing device (16), and two transverse top seams (03) of adjacent tubular bags being formed in one work step of the transverse sealing device (16), and said tubular bags (01) being formed with an alternating orientation in the draw direction by means of a draw device (15),
    characterized in that
    the side folder (18) interacts with a stationary fold molding (19) disposed on the inner side of the film sheet (04) when forming the side fold (09) in the area of the transverse bottom seam (02), the minimal distance of the transverse sealing device (16) to the fold molding (19) being alternatingly altered in the draw direction on the closed movement trajectory when forming the transverse top seams and the transverse bottom seams, said minimal distance of the transverse sealing device (16) to the fold molding (19) being larger when producing the two transverse top seams (03) than the minimal distance of the transverse sealing device (16) to the fold molding (19) when producing the transverse bottom seams (02).
  2. The method according to claim 1,
    characterized in that
    the draw speed of the draw device (15) when forming a first tubular bag (01) corresponds to a first speed profile, said draw speed of the draw device (15) corresponding to a second speed profile different to the first speed profile when forming a directly following second tubular bag.
  3. The method according to claim 2,
    characterized in that
    the draw speed of the draw device (15), by means of which the film sheet is drawn in the longitudinal direction, is alternatingly altered between a speed maximum and a speed minimum in such a manner that the alternating alteration of the minimal distance of the transverse sealing device (16) to the fold molding (19) is compensated and the tubular bag length of all sealed tubular bags (01) is kept constant.
  4. The method according to any of claims 1 to 3,
    characterized in that
    strip-shaped closing elements (07, 08), which can be detachably engaged with each other, are fastened adjacent to the transverse top seam (03) of the tubular bag (01) transversally to the longitudinal axis of the film sheet (04).
EP17751021.1A 2016-07-18 2017-07-11 Method for operating a vffs for producing bags with a ground-cross-seal and a different head-seal-shape Active EP3328739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016213087.0A DE102016213087B4 (en) 2016-07-18 2016-07-18 Method for operating a tubular bag machine for the production of bags with a bottom cross seam and a different head cross seam
PCT/EP2017/067420 WO2018015217A1 (en) 2016-07-18 2017-07-11 Method for operating a tubular-bag machine for producing bags with a transverse bottom seam and a transverse head seam, which is different from the bottom seam

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EP3328739A1 EP3328739A1 (en) 2018-06-06
EP3328739B1 true EP3328739B1 (en) 2019-09-25

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US (1) US10946991B2 (en)
EP (1) EP3328739B1 (en)
DE (1) DE102016213087B4 (en)
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JP7212356B2 (en) 2018-12-27 2023-01-25 株式会社イシダ bag making and packaging machine

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WO2018015217A1 (en) 2018-01-25
DE102016213087A1 (en) 2018-01-18
US20190248520A1 (en) 2019-08-15
ES2763808T3 (en) 2020-06-01
DE102016213087B4 (en) 2018-07-05
EP3328739A1 (en) 2018-06-06
US10946991B2 (en) 2021-03-16

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