EP2868466B1 - Method for the production of film bags - Google Patents
Method for the production of film bags Download PDFInfo
- Publication number
- EP2868466B1 EP2868466B1 EP13190923.6A EP13190923A EP2868466B1 EP 2868466 B1 EP2868466 B1 EP 2868466B1 EP 13190923 A EP13190923 A EP 13190923A EP 2868466 B1 EP2868466 B1 EP 2868466B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gussets
- produced
- front side
- bag
- film
- 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.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/001—Flexible containers made from webs by folding webs longitudinally
- B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2170/00—Construction of flexible containers
- B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2170/00—Construction of flexible containers
- B31B2170/30—Construction of flexible containers having corrugated or pleated walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/26—Folding sheets, blanks or webs
- B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
- B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
- B31B70/813—Applying closures
- B31B70/8131—Making bags having interengaging closure elements
- B31B70/8133—Applying the closure elements in the cross direction
Definitions
- the present invention relates to a method of producing foil bags having first and second front sides, two side gussets inserted V-shaped between the front sides in a bag longitudinal direction, and an opening on a bag head, the front sides and the side pleats being in common a multilayer film are formed, wherein the gussets terminate below the opening at the bag head and wherein upper ends of the gussets are closed.
- the method according to the invention is intended, in particular, to produce flat, prefabricated foil pouches, which are subsequently charged and sealed with filling material in a pouch filling device, wherein the filling is usually carried out on a bag head. After filling, the film bag is closed by a heat seal and can then be ripped open again on first use.
- the film bag in question are formed from a multilayer film
- the multilayer film is usually heat-sealable only on one of its outer layers.
- These heat-sealable outer layer is arranged on the inside during the formation of the film bag and thus allows the formation of the bag by heat sealing and the attachment of functional elements such as a reclosure.
- the other outer layer arranged on the outside of the pouches remains unimpaired because it does not melt, at least at the set heat-sealing temperatures.
- the two front sides and the interposed gussets can be fed as separate films and then connected.
- the foil pouch or a strand from which individual foil pouches can be separated is then composed, as it were, of several foil sections or foil strips.
- the individual elements can be modified or adapted before merging.
- the present invention relates to a method in which the foil bags share the two front sides and the two side folds are formed from a multilayer film substantially by folding. This results in the advantage that not several parts must be supplied and connected to each other.
- the design possibilities of the bag are limited to a certain extent because it is always worked with a continuous, continuous web or a continuous, coherent strand.
- Corresponding methods for the production of film bags with gussets are made EP 1 754 596 B1 . US 2002/0103067 A1 and WO 2008/120062 A2 known.
- the ends formed by the punched folds in the region of the bag head are sealed either by respectively associated foil tape, a transversely extending film strip or a reclosure.
- the invention has for its object to provide a method for the production of foil bags, which allows in a simple manner the formation of foil bags by folding, which are closed by a punched shortened gussets safely.
- the side folds are folded obliquely onto themselves at one of their ends formed by the cutouts, so that the ends formed by punched-out lines are aligned along the longitudinal direction after folding over, the folded ends are then sealed.
- the ends can already be fixed so that they are held in position during the further handling of the strand.
- a tight integration into an edge of the strand or of the pouches to be formed therefrom preferably takes place only during the production of longitudinal sealing seams.
- the punches are interruptions of the gussets, wherein at least the end of the gussets is folded as described, which lies in a finished foil bag below the bag head.
- the film web is transported either continuously or intermittently in a feed direction, which usually corresponds to the longitudinal direction of the bag formed in retrospect.
- the punches are seen in the longitudinal direction formed at the same height with a distance in the transverse direction exactly where later the gussets are formed.
- the first front side can be formed approximately centrally on the film web.
- the edges of the film web then come together on the surface of the second front side and are to be connected there by a separate longitudinal sealing seam.
- a side fold, the first front side, the second side fold and finally the second front side are formed up to the other edge of the film web.
- the width of the punched holes in the transverse direction is preferably smaller than twice the width of the V-shaped inserted between the front side gussets.
- the edge of the punching falls exactly in a folded edge. There is then under certain circumstances an increased risk that the film web or the strand formed therefrom will be damaged during folding by folding knife.
- the width of the punched holes is smaller than twice the width of the V-shaped inserted between the front side gussets and if the punching centered centered with respect to the gusset, remains at the folding edges always at least a narrow portion of the film, which optionally subsequently by a trimming of the longitudinal edges can be removed. Such trimming is also referred to as trimming.
- the skein In order to be able to easily fold over the ends of the gussets arranged below the bag head, the skein can be guided past a folding device, which lifts and folds the end of the gusset at an inner folding edge. If the strand is transported continuously or intermittently in the feed direction, such folding over, depending on the configuration of the folding device provided for this purpose, can also be achieved by fixed, simply designed folding knives or the like. By feeding the strand, the ends of the gussets are then folded over immediately.
- the folding is expediently such that the folded ends are placed from above on the associated side fold. After the formation of the second front side, the folded-over ends are thus arranged between the respective side fold and the second front side.
- the ends are expediently folded at an angle of 45 °, so that the ends after folding exactly along the longitudinal direction are aligned.
- the longitudinal sealing seam which closes the strand circumferentially has to be designed continuously in order to be able to close the bag. Further longitudinal sealing seams do not necessarily have to be carried out. In principle, it is sufficient if the folded-over end of the gussets and the two front sides are sealed in the region of the punched-out. Preferably, however, longitudinal sealing seams are produced, which extend along the entire strand.
- the folded ends of the gussets in the transverse direction are at least slightly opposite the edge of the skein.
- a subsequent trimming may be appropriate.
- the folding over of the ends of the gussets formed by the stamping is in particular provided in the transverse direction in the region of the punched-out part to use extending reclosure.
- a reclosure with profile strips is used, which can be locked together.
- a locking can be done, for example, by transversely extending grooves and teeth or in the manner of a hook and loop fastener.
- a zipper closure can be provided on the upper edge of the bag a reclosure with latchable profile strips that can be actuated by a slider.
- Corresponding closures are known in practice as so-called slider closures.
- a multilayer laminated film is preferably supplied, which in addition to the outer layer of weldable thermoplastic material has an opposite outer layer which is non-weldable at a predetermined heat sealing temperature.
- the strand can be formed by heat sealing, without the appearance of the film bag is impaired.
- internal printing can also be provided.
- laminated films with a heat-sealable outer layer of polyethylene, which is arranged on the inside of the bag, while the opposite outer layer can be formed, for example, from polyethylene terephthalate (PET) or biaxially oriented polypropylene (BO-PP), are suitable.
- PET polyethylene terephthalate
- BO-PP biaxially oriented polypropylene
- the Fig. 1 shows a foil bag, which is produced by the method according to the invention. For clarity, an upper corner of the foil bag is shown broken.
- the film bag comprises a first front side 1 and a second front side 2, between which two V-shaped inserted side pleats 3 are arranged.
- the foil bag is not closed on a bag head 4 and has there corresponding opening.
- the flattened with the inserted gussets 3 foil bag is provided as a prefabricated bag (pre-made bag) for subsequent filling.
- a reclosure 5 is provided in the region of the bag head 4, which is formed as a zipper closure of two interlockable profile strips 6.
- the gussets 3 are offset from the bag head 4.
- one end 7 of the gussets is in each case folded over and integrated into an associated longitudinal sealing seam 8 on the edge of the bag.
- the two lateral folds 3 are connected over their entire length to the first front side 1 and the second front side 2 in the illustrated embodiment.
- the ends 7 are turned over in a simple manner at an angle of 45 °.
- the Ends 7 are therefore arranged between the associated side fold 3 and the front wall 2.
- Fig. 2a and 2 B show the inventive method for the preparation of in Fig. 1 illustrated foil bag.
- the distance of the punch-outs 10 in the longitudinal direction also corresponds to the length of a film bag to be formed.
- the punch-outs 10 are introduced in the region of the gussets 3 to be subsequently formed, wherein the width of the punch-outs a is smaller than twice the width b of the side folds 3 to be formed in a V-shape between the front sides 1, 2.
- a reclosure 5 is supplied and placed between the punched holes 10 on the first front side 1. It may be appropriate to fix the reclosure 5 at least against slipping.
- the film web 9 is then folded in a folding station, not shown, such that a strand 12 with the gussets 3 and the first front side first is formed below the gussets 3.
- the section from which the second front side 2 is subsequently formed is then still unfolded next to one of the two lateral folds 3.
- the advancing in the transport direction end 7 of the gussets 3 is folded over at an angle to itself, so that the ends formed by the punching 7 of the gussets 3 are aligned along the longitudinal direction.
- the folding over of the ends 7 of the gussets 3 can be done by a folding device, not shown, which causes alone by the propulsion of the strand 12 in a particularly simple manner, the folding. After folding over the ends 7, these can be fixed or prefixed in this position.
- the second front side 2 is formed, which also covers the gussets 3.
- longitudinal sealing seams 8 are produced, wherein the longitudinal sealing seams 8 connect the side folds 3 to the first front side 1 and the second front side 2.
- the longitudinal sealing seams 8 between the gussets 3 and the second front side 2 also bind the folded-over ends 7.
- the strand 12 is where the edges of the film web 9 lie one above the other, closed by the associated longitudinal sealing seam 8 circumferentially.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Bag Frames (AREA)
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Folienbeuteln, die eine erste und eine zweite Frontseite, zwei V-förmig zwischen die Frontseiten eingelegte, sich in einer Beutellängsrichtung erstreckende Seitenfalten und eine Öffnung an einem Beutelkopf aufweisen, wobei die Frontseiten und die Seitenfalten gemeinsam aus einer mehrschichtigen Folie gebildet sind, wobei die Seitenfalten unterhalb der Öffnung an dem Beutelkopf enden und wobei obere Enden der Seitenfalten verschlossen sind.The present invention relates to a method of producing foil bags having first and second front sides, two side gussets inserted V-shaped between the front sides in a bag longitudinal direction, and an opening on a bag head, the front sides and the side pleats being in common a multilayer film are formed, wherein the gussets terminate below the opening at the bag head and wherein upper ends of the gussets are closed.
Das erfindungsgemäße Verfahren ist insbesondere dazu vorgesehen, flachliegende, vorgefertigte Folienbeutel herzustellen, die nachfolgend in einer Beutelfülleinrichtung mit Füllgut beschickt und verschlossen werden, wobei die Befüllung üblicherweise an einem Beutelkopf erfolgt. Nach der Befüllung wird der Folienbeutel durch eine Heißsiegelnaht verschlossen und kann dann bei einem erstmaligen Gebrauch wieder aufgerissen werden.The method according to the invention is intended, in particular, to produce flat, prefabricated foil pouches, which are subsequently charged and sealed with filling material in a pouch filling device, wherein the filling is usually carried out on a bag head. After filling, the film bag is closed by a heat seal and can then be ripped open again on first use.
Es ist bekannt, entsprechende Folienbeutel mit einem Wiederverschluss zu versehen. Um eine leichte Anordnung eines solchen Wiederverschlusses zu ermöglichen, sind die Seitenfalten gegenüber dem Beutelkopf abgesetzt, so dass der Wiederverschluss oberhalb der Seitenfalten zwischen die erste und die zweite Frontseite über die gesamte Breite des Folienbeutels eingesetzt werden kann.It is known to provide corresponding foil bag with a reclosure. In order to allow easy placement of such reclosure, the gussets are offset from the bag head so that the reclosure above the gussets between the first and second fronts can be deployed across the entire width of the film bag.
Bei einem solchen Seitenfaltenbeutel mit von dem Beutelkopf abgesetzten Seitenfalten besteht die Notwendigkeit, die gekürzten Seitenfalten zuverlässig zu verschließen. Dabei ist zu beachten, dass die in Rede stehenden Folienbeutel aus einer mehrschichtigen Folie gebildet sind, wobei die mehrschichtige Folie üblicherweise nur an einer ihrer Außenschichten heißsiegelbar ist. Diese heißsiegelbare Außenschicht wird bei der Bildung des Folienbeutels an der Innenseite angeordnet und erlaubt so die Ausformung des Beutels durch Heißsiegeln sowie das Anbringen funktioneller Elemente wie beispielsweise eines Wiederverschlusses. Bei der Erzeugung entsprechender Heißsiegelnähte bleibt die andere, an der Beutelaußenseite angeordnete Außenschicht ohne Beeinträchtigungen, weil diese - zumindest bei den eingestellten Heißsiegeltemperaturen - nicht aufschmilzt.In such a gusseted bag with side gussets deposited from the bag head, there is a need to reliably close the shortened gussets. It should be noted that the film bag in question are formed from a multilayer film, the multilayer film is usually heat-sealable only on one of its outer layers. These heat-sealable outer layer is arranged on the inside during the formation of the film bag and thus allows the formation of the bag by heat sealing and the attachment of functional elements such as a reclosure. In the production of corresponding heat-sealing seams, the other outer layer arranged on the outside of the pouches remains unimpaired because it does not melt, at least at the set heat-sealing temperatures.
Häufig werden als Folie mehrschichtig kaschierten Folien eingesetzt, die dann auch mit einer innenliegenden Bedruckung versehen sein können. Gerade solche Beutel zeichnen durch gute Funktionseigenschaften und ein hochwertiges Erscheinungsbild aus.Frequently be used as a film multilayer laminated films, which can then be provided with an internal printing. Especially such bags are characterized by good functional properties and a high-quality appearance.
Für die Erzeugung vorgefertigter Folienbeutel mit abgesetzten Seitenfalten kommen zwei grundsätzlich unterschiedliche Verfahrensansätze in Betracht. So können die beiden Frontseiten und die dazwischen eingelegten Seitenfalten als separate Folien zugeführt und dann verbunden werden. Der Folienbeutel bzw. ein Strang, aus dem einzelne Folienbeutel abgetrennt werden können, wird dann gleichsam aus mehreren Folienabschnitten oder Folienstreifen zusammengesetzt. Bei einer solchen Verfahrensführung ergibt sich ein großes Maß an Flexibilität, weil sich sehr weitreichende Kombinationsmöglichkeiten ergeben, wobei die einzelnen Elemente bereits vor ihrem Zusammenführen modifiziert oder angepasst werden können.For the production of prefabricated film bags with offset gussets, two fundamentally different process approaches come into consideration. Thus, the two front sides and the interposed gussets can be fed as separate films and then connected. The foil pouch or a strand from which individual foil pouches can be separated is then composed, as it were, of several foil sections or foil strips. In such a process management results in a great deal of flexibility, because there are very far-reaching combination options, the individual elements can be modified or adapted before merging.
Entsprechende Verfahren sind aus
Die vorliegende Erfindung bezieht sich dagegen auf ein Verfahren, bei dem die Folienbeutel mit den beiden Frontseiten und den beiden Seitenfalten gemeinsam aus einer mehrschichtigen Folie im Wesentlichen durch Falten gebildet werden. Es ergibt sich der Vorteil, dass nicht mehrere Teile zugeführt und miteinander verbunden werden müssen. Andererseits sind die Gestaltungsmöglichkeiten des Beutels in einem gewissen Maße eingeschränkt, weil stets mit einer durchgehenden, zusammenhängenden Bahn bzw. einem durchgehenden, zusammenhängenden Strang gearbeitet wird. Entsprechende Verfahren zur Herstellung von Folienbeuteln mit Seitenfalten sind aus
Um im Rahmen eines solchen Verfahrens einen dichten Verschluss der durch eine Ausstanzung gekürzten Seitenfalten zu erreichen, werden die durch die Ausstanzungen gebildeten Enden der Seitenfalten im Bereich des Beutelkopfes entweder durch jeweils zugeordnete Folienzettel, einen in Querrichtung verlaufenden Folienstreifen oder einen Wiederverschluss versiegelt.In order to achieve a tight closure of the shortened by a punching gussets in the context of such a method, the ends formed by the punched folds in the region of the bag head are sealed either by respectively associated foil tape, a transversely extending film strip or a reclosure.
Diese Vorgehensweise hat sich in der Praxis bewährt, jedoch ist die Anbringung eines separaten Folienzettels bzw. die genaue Positionierung des Wiederverschlusses überlappend mit dem oberen Ende der Seitenfalten aufwendig. Insbesondere muss mit dem Folienzettel, Folienstreifen oder zugeordneten Teil des Wiederverschlusses am oberen Ende der eingekürzten Seitenfalte eine Stufe überbrückt werden, so dass dort eine zuverlässige Abdichtung nur erreicht werden kann, wenn die Versiegelung mit einer großen Sorgfältigkeit vorgenommen wird.This approach has been proven in practice, however, the attachment of a separate film pile or the exact positioning of the reclosure is overlapping with the upper end of the gussets expensive. In particular, a step must be bridged with the foil strip, film strip or associated part of the reclosure at the upper end of the shortened gusset, so that there a reliable seal can be achieved only if the seal is made with great care.
Aus der
Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung von Folienbeuteln anzugeben, welches auf einfache Weise die Bildung von Folienbeuteln durch Falten ermöglicht, wobei durch eine Ausstanzung eingekürzte Seitenfalten sicher verschlossen sind.Against this background, the invention has for its object to provide a method for the production of foil bags, which allows in a simple manner the formation of foil bags by folding, which are closed by a punched shortened gussets safely.
Gegenstand der Erfindung und Lösung der Aufgabe ist ein Verfahren gemäß Patentanspruch 1.Object of the invention and solution of the problem is a method according to
Ausgehend von einem Verfahren zur Herstellung von Folienbeuteln durch Falten einer Folienbahn ist erfindungsgemäß vorgesehen, dass die Seitenfalten an einem ihrer durch die Ausstanzungen gebildeten Enden schräg auf sich selbst umgefaltet werden, so dass die durch Ausstanzungen gebildeten Enden nach dem Umfalten entlang der Längsrichtung ausgerichtet sind, wobei die so umgefalteten Enden dann versiegelt werden. Direkt nach dem Umfalten kann bereits eine Fixierung der Enden erfolgen, damit diese bei der weiteren Hand-habung des Stranges in ihrer Position gehalten werden. Eine dichte Einbindung in einen Rand des Stranges bzw. der daraus zu bildenden Beutel erfolgt aber vorzugsweise erst bei der Erzeugung von Längssiegelnähten.Starting from a method of producing film bags by folding a film web, it is provided according to the invention that the side folds are folded obliquely onto themselves at one of their ends formed by the cutouts, so that the ends formed by punched-out lines are aligned along the longitudinal direction after folding over, the folded ends are then sealed. Immediately after folding over, the ends can already be fixed so that they are held in position during the further handling of the strand. However, a tight integration into an edge of the strand or of the pouches to be formed therefrom preferably takes place only during the production of longitudinal sealing seams.
An dem Strang stellen die Ausstanzungen Unterbrechungen der Seitenfalten dar, wobei zumindest das Ende der Seitenfalten wie beschrieben umgelegt wird, welches bei einem fertigen Folienbeutel unterhalb des Beutelkopfes liegt.On the strand, the punches are interruptions of the gussets, wherein at least the end of the gussets is folded as described, which lies in a finished foil bag below the bag head.
Erfindungsgemäß kann auf besonders einfache Weise ein dichter Verschluss der Seitenfalten erreicht werden, wobei keine weiteren Einschnitte, Umformungen oder dergleichen notwendig sind. Es ergibt sich damit eine besonders einfache Verfahrensführung, welche auch einen besonders hohen Durchsatz, das heißt eine große Geschwindigkeit der Folienbahn bzw. des Stranges, ermöglicht.According to the invention can be achieved in a particularly simple manner a tight closure of the gussets, with no further cuts, transformations or the like are necessary. This results in a particularly simple process control, which also allows a particularly high throughput, that is, a high speed of the film web or the strand.
Die Folienbahn wird entweder kontinuierlich oder taktweise in einer Vorschubrichtung transportiert, welche üblicherweise der Längsrichtung der im Nachhinein gebildeten Beutel entspricht. Die Ausstanzungen werden in Längsrichtung gesehen auf gleicher Höhe mit einem Abstand in Querrichtung genau dort gebildet, wo später die Seitenfalten ausgeformt werden.The film web is transported either continuously or intermittently in a feed direction, which usually corresponds to the longitudinal direction of the bag formed in retrospect. The punches are seen in the longitudinal direction formed at the same height with a distance in the transverse direction exactly where later the gussets are formed.
Grundsätzlich kann die erste Frontseite etwa mittig an der Folienbahn gebildet werden. Bei einer solchen im Wesentlichen symmetrischen Ausgestaltung kommen dann die Ränder der Folienbahn auf der Fläche der zweiten Frontseite zusammen und sind dort durch eine separate Längssiegelnaht zu verbinden.In principle, the first front side can be formed approximately centrally on the film web. In such a substantially symmetrical configuration, the edges of the film web then come together on the surface of the second front side and are to be connected there by a separate longitudinal sealing seam.
Gemäß einer alternativen, bevorzugten Ausgestaltung der Erfindung wird ausgehend von einem Rand der Folienbahn eine Seitenfalte, die erste Frontseite, die zweite Seitenfalte und schließlich bis zum anderen Rand der Folienbahn die zweite Frontseite gebildet. Es ergibt sich dann der Vorteil, dass die den Strang umfangsseitig schließende Längssiegelnaht entlang eines Beutelrandes verläuft, so dass beide Frontseiten ohne Unterbrechung bereitgestellt werden können, wodurch sich ein besonders ansprechendes Erscheinungsbild ergibt.According to an alternative, preferred embodiment of the invention, starting from one edge of the film web, a side fold, the first front side, the second side fold and finally the second front side are formed up to the other edge of the film web. This results in the advantage that the strand circumferentially closing longitudinal sealing seam runs along a bag edge, so that both front sides can be provided without interruption, resulting in a particularly appealing appearance.
Die Breite der Ausstanzungen in Querrichtung ist vorzugsweise kleiner als die doppelte Breite der V-förmig zwischen die Frontseiten eingelegten Seitenfalten.The width of the punched holes in the transverse direction is preferably smaller than twice the width of the V-shaped inserted between the front side gussets.
Wenn die Ausstanzungen sich über die gesamte Seitenfalte erstrecken, fällt der Rand der Ausstanzung genau in eine Faltkante. Es besteht dann unter Umständen eine erhöhte Gefahr, dass die Folienbahn bzw. der daraus gebildete Strang beim Falten durch Faltmesser beschädigt werden. Wenn dagegen die Breite der Ausstanzungen kleiner als die doppelte Breite der V-förmig zwischen die Frontwände eingelegten Seitenfalten ist und wenn die Ausstanzung bezogen auf die Seitenfalte mittig zentriert angeordnet wird, verbleibt an den Faltkanten stets zumindest ein schmaler Abschnitt der Folie, welcher gegebenenfalls nachträglich durch ein Beschneiden der Längsränder entfernt werden kann. Ein solches Beschneiden wird auch als Besäumen bezeichnet. Durch ein Beschneiden der Längskanten kann insbesondere auch der optische Gesamteindruck des Folienbeutels verbessert werden.When the cutouts extend over the entire gusset, the edge of the punching falls exactly in a folded edge. There is then under certain circumstances an increased risk that the film web or the strand formed therefrom will be damaged during folding by folding knife. In contrast, if the width of the punched holes is smaller than twice the width of the V-shaped inserted between the front side gussets and if the punching centered centered with respect to the gusset, remains at the folding edges always at least a narrow portion of the film, which optionally subsequently by a trimming of the longitudinal edges can be removed. Such trimming is also referred to as trimming. By trimming the longitudinal edges, in particular the overall visual impression of the film bag can be improved.
Um die unterhalb des Beutelkopfes angeordneten Enden der Seitenfalten auf einfache Weise umfalten zu können, kann der Strang an einer Falteinrichtung vorbeigeführt werden, welche das Ende der Seitenfalte an einer innenliegenden Faltkante anhebt und umlegt. Wenn der Strang kontinuierlich oder taktweise in Vorschubrichtung transportiert wird, kann ein solches Umfalten je nach Ausgestaltung der dazu vorgesehenen Falteinrichtung auch durch feststehende, einfach ausgestaltete Faltmesser oder dergleichen erreicht werden. Durch den Vorschub des Stranges werden dann die Enden der Seitenfalten unmittelbar umgefaltet.In order to be able to easily fold over the ends of the gussets arranged below the bag head, the skein can be guided past a folding device, which lifts and folds the end of the gusset at an inner folding edge. If the strand is transported continuously or intermittently in the feed direction, such folding over, depending on the configuration of the folding device provided for this purpose, can also be achieved by fixed, simply designed folding knives or the like. By feeding the strand, the ends of the gussets are then folded over immediately.
Das Umfalten erfolgt zweckmäßigerweise derart, dass die umgefalteten Enden von oben auf die zugeordnete Seitenfalte aufgelegt werden. Nach der Bildung der zweiten Frontseite sind die umgefalteten Enden also zwischen der jeweiligen Seitenfalte und der zweiten Frontseite angeordnet.The folding is expediently such that the folded ends are placed from above on the associated side fold. After the formation of the second front side, the folded-over ends are thus arranged between the respective side fold and the second front side.
Wenn in der Folienbahn gemäß einer bevorzugten Ausgestaltung der Erfindung rechteckig in Quer- und Längs- bzw. Vorschubrichtung berandete Ausstanzungen gebildet werden, erfolgt ein Umfalten der Enden zweckmäßigerweise in einem Winkel von 45°, so dass dann die Enden nach dem Umfalten genau entlang der Längsrichtung ausgerichtet sind.If in the film web according to a preferred embodiment of the invention rectangular cutouts bounded in the transverse and longitudinal or feed direction are formed, the ends are expediently folded at an angle of 45 °, so that the ends after folding exactly along the longitudinal direction are aligned.
Grundsätzlich ist es aber auch denkbar, eine nicht genau rechteckige, sondern beispielsweise rautenförmige Ausstanzung vorzusehen. Um die so gebildeten freien Enden der Seitenfalten dann entlang der Längsrichtung ausrichten zu können, ist dann eine von 45° abweichende Abwinklung erforderlich.In principle, it is also conceivable to provide a not exactly rectangular, but for example diamond-shaped punched out. In order to align the free ends of the gussets thus formed along the longitudinal direction, then an angle deviating from 45 ° is required.
Die den Strang umfangsseitig schließende Längssiegelnaht muss durchgehend ausgestaltet sein, um den Beutel verschließen zu können. Weitere Längssiegelnähte müssen nicht zwingend durchgeführt werden. Grundsätzlich ist es ausreichend, wenn die umgefalteten Ende der Seitenfalten und die beiden Frontseiten im Bereich der Ausstanzung miteinander versiegelt werden. Vorzugsweise werden aber Längssiegelnähte erzeugt, welche sich entlang des gesamten Stranges erstrecken.The longitudinal sealing seam which closes the strand circumferentially has to be designed continuously in order to be able to close the bag. Further longitudinal sealing seams do not necessarily have to be carried out. In principle, it is sufficient if the folded-over end of the gussets and the two front sides are sealed in the region of the punched-out. Preferably, however, longitudinal sealing seams are produced, which extend along the entire strand.
Insbesondere wenn die Ausstanzungen kleiner als die doppelte Breite der Seitenfalten sind, stehen die umgefalteten Enden der Seitenfalten in Querrichtung zumindest etwas gegenüber dem Rand des Stranges zurück. Gerade um hier eine Angleichung zu ermöglichen, kann ein nachträgliches Besäumen zweckmäßig sein. Darüber hinaus besteht auch die Möglichkeit, die Längssiegelnähte im Bereich der umgefalteten Enden mit einer Verbreiterung zu versehen.In particular, when the punches are smaller than twice the width of the gussets, the folded ends of the gussets in the transverse direction are at least slightly opposite the edge of the skein. Just to allow an approximation here, a subsequent trimming may be appropriate. In addition, it is also possible to provide the longitudinal sealing seams in the region of the folded ends with a broadening.
Das Umfalten der durch die Ausstanzung gebildeten Enden der Seitenfalten ist insbesondere dazu vorgesehen, um im Bereich der Ausstanzung einen in Querrichtung verlaufenden Wiederverschluss einzusetzen. Vorzugsweise wird dazu ein Wiederverschluss mit Profilstreifen eingesetzt, die miteinander verriegelbar sind. Eine Verriegelung kann beispielsweise durch in Querrichtung verlaufende Nuten und Zähne oder auch nach Art eines Klettverschlusses erfolgen. Neben einem solchen in der Praxis auch als Zipper bezeichneten Verschluss kann auch an dem oberen Rand des Beutels ein Wiederverschluss mit verrastbaren Profilstreifen vorgesehen sein, die durch einen Schieber betätigt werden können. Entsprechende Verschlüsse sind in der Praxis als sogenannte Slider-Verschlüsse bekannt.The folding over of the ends of the gussets formed by the stamping is in particular provided in the transverse direction in the region of the punched-out part to use extending reclosure. Preferably, a reclosure with profile strips is used, which can be locked together. A locking can be done, for example, by transversely extending grooves and teeth or in the manner of a hook and loop fastener. In addition to such as in practice also referred to as a zipper closure can be provided on the upper edge of the bag a reclosure with latchable profile strips that can be actuated by a slider. Corresponding closures are known in practice as so-called slider closures.
Als Folienbahn wird vorzugsweise eine mehrschichtig kaschierte Folie zugeführt, die neben der Außenschicht aus schweißbarem thermoplastischen Kunststoff eine gegenüberliegende Außenschicht aufweist, die bei einer vorgegebenen Heißsiegeltemperatur nicht-schweißbar ist. Im Rahmen einer solchen Ausgestaltung kann der Strang durch Heißsiegeln gebildet werden, ohne dass das Erscheinungsbild des Folienbeutels beeinträchtigt wird. Insbesondere kann bei einer kaschierten Folie auch eine innenliegende Bedruckung vorgesehen sein. Geeignet sind beispielsweise kaschierte Folien mit einer heißsiegelbaren Außenschicht aus Polyethylen, die innenliegend an dem Beutel angeordnet wird, während die gegenüberliegende Außenschicht beispielsweise aus Polyethylenterephthalat (PET) oder biaxial orientiertem Polypropylen (BO-PP) gebildet sein kann.As a film web, a multilayer laminated film is preferably supplied, which in addition to the outer layer of weldable thermoplastic material has an opposite outer layer which is non-weldable at a predetermined heat sealing temperature. In the context of such an embodiment, the strand can be formed by heat sealing, without the appearance of the film bag is impaired. In particular, in the case of a laminated film, internal printing can also be provided. For example, laminated films with a heat-sealable outer layer of polyethylene, which is arranged on the inside of the bag, while the opposite outer layer can be formed, for example, from polyethylene terephthalate (PET) or biaxially oriented polypropylene (BO-PP), are suitable.
Die Erfindung wird im Folgenden anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung erläutert. Es zeigen:
- Fig. 1
- einen Folienbeutel und
- Fig. 2a und 2b
- die Verfahrensschritte zur Herstellung des Folienbeutels.
- Fig. 1
- a foil bag and
- Fig. 2a and 2b
- the process steps for the production of the film bag.
Die
Der Folienbeutel umfasst eine erste Frontseite 1 sowie eine zweite Frontseite 2, zwischen denen zwei V-förmig eingelegte Seitenfalten 3 angeordnet sind. Der Folienbeutel ist an einem Beutelkopf 4 nicht verschlossen und weist dort entsprechend eine Öffnung auf. Der mit den eingelegten Seitenfalten 3 flachgelegte Folienbeutel ist als vorgefertigter Beutel (pre-made bag) für eine nachträgliche Befüllung vorgesehen.The film bag comprises a first
Zwischen der ersten Frontseite 1 und der zweiten Frontseite 2 ist im Bereich des Beutelkopfes 4 ein Wiederverschluss 5 vorgesehen, der als Zipper-Verschluss aus zwei miteinander verriegelbaren Profilstreifen 6 gebildet ist.Between the first
Um den Wiederverschluss 5 auf einfache Weise über die gesamte Breite des Folienbeutels zwischen der ersten Frontseite 1 und der zweiten Frontseite 2 anordnen zu können, sind die Seitenfalten 3 gegenüber dem Beutelkopf 4 abgesetzt. Um dabei einen dichten Verschluss der Seitenfalten 3 zu erreichen, ist jeweils ein Ende 7 der Seitenfalten umgeknickt und in eine zugeordnete Längssiegelnaht 8 an dem Beutelrand eingebunden. An den Längssiegelnähten 8 sind in dem dargestellten Ausführungsbeispiel die beiden Seitenfalten 3 über ihre gesamte Länge mit der ersten Frontseite 1 bzw. der zweiten Frontseite 2 verbunden.In order to be able to arrange the
Um eine zuverlässige Abdichtung der Seitenfalten 3 zu erreichen, sind die Enden 7 auf einfache Weise in einem Winkel von 45° umgeschlagen. Die Enden 7 sind damit also zwischen der zugeordneten Seitenfalte 3 und der Frontwand 2 angeordnet.In order to achieve a reliable sealing of the
Die
Zunächst wird gemäß der
Der Abstand der Ausstanzungen 10 in Längsrichtung entspricht dabei auch der Länge eines zu bildenden Folienbeutels.The distance of the punch-
Zur Verdeutlichung des Verfahrens sind bereits bei der in
Sodann wird ein Wiederverschluss 5 zugeführt und zwischen den Ausstanzungen 10 auf die erste Frontseite 1 aufgesetzt. Dabei kann es zweckmäßig sein, den Wiederverschluss 5 zumindest gegen ein Verrutschen zu fixieren.Then, a
Die Folienbahn 9 wird dann in einer nicht dargestellten Faltstation derart gefaltet, dass ein Strang 12 mit den Seitenfalten 3 und der ersten Frontseite 1 unterhalb der Seitenfalten 3 gebildet wird. Der Abschnitt, aus dem nachfolgend die zweite Frontseite 2 gebildet wird, liegt dann noch aufgeklappt neben einer der beiden Seitenfalten 3.The
Sodann wird das in Transportrichtung vorlaufende Ende 7 der Seitenfalten 3 schräg auf sich selbst umgefaltet, so dass die durch das Ausstanzen gebildeten Enden 7 der Seitenfalten 3 entlang der Längsrichtung ausgerichtet sind.Then, the advancing in the transport direction end 7 of the
Das Umfalten der Enden 7 der Seitenfalten 3 kann durch eine nicht dargestellte Falteinrichtung erfolgen, welche alleine durch den Vortrieb des Stranges 12 auf besonders einfache Weise das Umfalten bewirkt. Nach dem Umfalten der Enden 7 können diese in dieser Position fixiert bzw. vorfixiert werden.The folding over of the
Sodann wird durch ein weiteres Falten des Stranges 12 die zweite Frontseite 2 gebildet, welche auch die Seitenfalten 3 abdeckt.Then, by further folding of the
Gemäß der
Der Strang 12 wird dort, wo die Ränder der Folienbahn 9 aufeinanderliegenden, durch die zugeordnete Längssiegelnaht 8 umfangsseitig verschlossen.The
Schließlich werden aus dem Strang 12 einzelne Folienbeutel geschnitten, nachdem eine den Boden der Folienbeutel bildende Quersiegelnaht 13 gebildet wurde und nachdem die Ränder des Stranges 12 beschnitten wurden, wobei auch die außenliegenden Faltkanten 11 abgetrennt werden.Finally, 12 individual foil bags are cut from the strand, after forming a bottom of the foil bag
Claims (10)
- A method for manufacturing film bags that feature a first and a second front side (1, 2), two gussets (3) that are placed between the front sides (1, 2) in a V-shaped fashion and extend in a longitudinal direction of the bag and an opening at a bag top (4), wherein the front sides (1, 2) and the gussets (3) are jointly produced of a multilayer film, wherein the gussets (3) end underneath the opening at the bag top (4), and wherein upper ends of the gussets (3) are sealed, with said method comprising the steps of:a) a film section (9) of the multilayer film featuring an outer layer of weldable thermoplastic plastic is made available,b) window-shaped punchings (10) are produced in the film section (9) on segments, on which the bag tops (4) of the film bags are subsequently produced,c) the film section (9) is transported through a folding station, in which a strip (12) with the gussets (3) and the first front side (1) underneath the gussets (3) is produced by folding the film section (9),characterized by the additional steps of:d) the gussets (3) on the strip (12) are obliquely folded over onto themselves on their end (7) produced by the punchings (10) such that the ends (7) produced by the punchings are aligned along the longitudinal direction after the folding operation,e) after the ends (7) of the gussets (3) have been folded over, the second front side (2) is produced by additionally folding the strip (12) on at least one of the gussets (3) such that the second front side covers the gussets (3),f) after the second front side (2) has been produced, longitudinal hot-sealing seams (8) are produced in order to circumferentially seal the strip (12) and the folded ends (7) of the gussets (3) are respectively sealed into a bag edge, andg) the strip (12) is cut into individual film bags in such a way that the opening is located at the punching (10) above the folded gussets (3).
- The method according to claim 1, wherein the second front side (2) is produced of a continuous film section, and wherein the longitudinal hot-sealing seam (8) for circumferentially sealing the strip (12) extends along a bag edge and also seals in the end (7) of one of the gussets (3).
- The method according to claim 1 or 2, wherein continuous longitudinal hot-sealing seams (8) are produced on the strip (12).
- The method according to claim 3, wherein the longitudinal hot-sealing seams (8) produced on the longitudinal bag edges feature a widening in the region of the folded ends (7).
- The method according to one of claims 1-4, wherein a reclosure system (5) is placed onto the first front side (1) before the second front side (2) is produced.
- The method according to one of claims 1-5, wherein the ends (7) of the gussets (3) are folded over by transporting the strip (12) past a folding device that lifts and folds over the end (7) of the gusset on an inner folding edge (11).
- The method according to one of claims 1-6, wherein the ends (7) of the gussets (3) are folded over in such a way that the folded ends (7) are arranged between the respective gusset (3) and the second front side (2).
- The method according to one of claims 1-7, wherein the strip (12) is trimmed on its longitudinal edges before it is cut into individual film bags.
- The method according to one of claims 1-8, wherein a width (a) of the punchings in the lateral direction is smaller than twice the width (b) of the gussets (3) inserted between the front sides (1, 2) in a V-shaped fashion.
- The method according to one of claims 1-9, wherein the supplied film section (9) consists of a multilayer laminated film that not only features the outer layer of weldable thermoplastic plastic, but also an opposite outer layer that is not weldable at a predefined hot-sealing temperature.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HUE13190923A HUE029237T2 (en) | 2013-10-30 | 2013-10-30 | Method for the production of film bags |
EP13190923.6A EP2868466B1 (en) | 2013-10-30 | 2013-10-30 | Method for the production of film bags |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13190923.6A EP2868466B1 (en) | 2013-10-30 | 2013-10-30 | Method for the production of film bags |
Publications (2)
Publication Number | Publication Date |
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EP2868466A1 EP2868466A1 (en) | 2015-05-06 |
EP2868466B1 true EP2868466B1 (en) | 2016-04-06 |
Family
ID=49510010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13190923.6A Not-in-force EP2868466B1 (en) | 2013-10-30 | 2013-10-30 | Method for the production of film bags |
Country Status (2)
Country | Link |
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EP (1) | EP2868466B1 (en) |
HU (1) | HUE029237T2 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20017182U1 (en) | 2000-10-06 | 2002-02-14 | Bischof und Klein GmbH & Co., 49525 Lengerich | Gusseted bags made of flexible, weldable material |
FR2820076B1 (en) | 2001-01-26 | 2003-07-25 | Flexico France Sarl | BELLOWS BAGS, METHOD AND MANUFACTURING MACHINE THEREFOR |
CA2453331C (en) | 2002-07-24 | 2007-04-10 | Totani Corporation | Plastic bag and plastic bag making apparatus |
DE202004006857U1 (en) | 2004-04-29 | 2005-09-08 | Bischof + Klein Gmbh & Co. Kg | Satchel bags |
US20080085823A1 (en) * | 2004-12-23 | 2008-04-10 | Marco Reggi | Method for Making a Bag |
FR2882683B1 (en) | 2005-03-02 | 2008-08-15 | Autobar Flexible Packaging Sa | METHOD FOR MANUFACTURING A BRAKE BAG FROM A PLASTIC FILM AND THE BAG OBTAINED |
DE102005026149B4 (en) * | 2005-06-06 | 2011-05-26 | Nordenia Deutschland Halle Gmbh | Process for the production of foil bags |
PL1754596T3 (en) | 2005-08-19 | 2008-03-31 | Nordenia Deutschland Halle Gmbh | Method for manufacturing bags with gussets |
JP4806565B2 (en) * | 2005-12-19 | 2011-11-02 | トタニ技研工業株式会社 | Plastic bag |
ITBO20070230A1 (en) | 2007-03-30 | 2008-09-30 | Bordi Carlo S R L | PROCEDURE AND EQUIPMENT FOR THE REALIZATION OF PLASTIC BAGS AND BAGS. |
US8414465B2 (en) | 2008-11-13 | 2013-04-09 | Totani Corporation | Plastic bag making apparatus |
-
2013
- 2013-10-30 EP EP13190923.6A patent/EP2868466B1/en not_active Not-in-force
- 2013-10-30 HU HUE13190923A patent/HUE029237T2/en unknown
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EP2868466A1 (en) | 2015-05-06 |
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