EP3170765A2 - Plastic film packaging bag with a carrying handle - Google Patents

Abstract

A packaging bag (19) made of plastic film, which is flat collapsible in the unfilled state and in the filled state in an approximately square shape, with two mutually parallel main walls (3,4), with two intermediate side walls (12,13), in the extending from both main walls (3,4) projecting and each connected by a side-separating weld (6,7) connected foil areas and with a in the unfilled state between the main walls (3,4) and the side walls (12,13) to be folded and Main walls (3,4) on top side connecting head wall (11), one of the head wall (11) opposite, open in the unfilled state gap between the main walls (3,4) forms a filling opening in the filled state of the packaging bag (1) with a To close a separating weld, wherein a carrying handle (2) made of plastic film on the upper side to the head fold wall (11) approximately centrally to this and in the folding direction of the Head fold wall (11) is arranged to extend and parallel to the main walls (3,4) along the head fold wall (11), in the course of development of packaging films to high strength but thin foils for a stiffer configuration when worn on the handle and for a more pleasant Handling of the handle when wearing designed in such a way that the carrying handle (2) formed from a separate strip of plastic film and secured along a lower edge (25) with a sealing or adhesive seam on the head fold wall (11) over substantially its entire length is.

Description

The invention relates to a packaging bag made of plastic film according to the preamble of claim 1 and a method for its production.

Such packaging bags are conventionally used as large-volume packaging bags for home-use lightweight consumer goods such as diapers, sanitary napkins, toilet paper and the like, which are packed in parallelepiped form and tightly embedded in the packaging bag. Because of the little handy size of the appropriate packaging a carrying handle on one of the narrow longitudinal sides of the cuboid shape is provided, with which the packaged bulk container is to be worn at a limited height and width.

Packaging bag of the type considered here with a head folding wall in the folded state, a carrying handle in the area of the head fold wall and an open before filling, to be closed after filling with a bottom seam bottom are from the DE 42 24 639 A1 known, wherein the carrying handle can be formed from a double fold of the film of the head folding wall, which is welded together to delineate the handle and head wall fold with a longitudinal sealing seam. Such a formation of the head fold wall with formed from the same film and sealed double-layered strip for a carrying handle is already inherently manufacturing technically delicate and expensive. In particular, however, the development of common bag films with high material strength but Materialerspranis and waste reduction extremely small thickness, for example, below 40 microns to the fact that the handle warps with the burden of the filling of the packaging bag in handling and that the carrying handle of the other, thin-walled packaging can provide no stiffening and stabilization anymore. In particular, however, is subject to the sealing seam between the two layers of the handle bar which simultaneously connects the two Falthälften the head fold wall, from the handle load ago and in particular also when machine filling by the filling heavy loads. These are unstoppable with a decreasing film thickness increasingly delicate sealed seam. Furthermore, the design possibilities of a carrying handle with a folded to a handle strip of the head wall fold are limited, if not about a contouring gaping foil areas to be taken into account.

The object of the invention is in contrast to provide a packaging betel, which is also to produce thin-walled film, while maintaining a handle-shaped form-retaining handle with an attractive contouring, the same time gives the filled packaging dimensional stability when this is worn hanging on the handle. At the same time, the packaging bag and its manufacturing method should be designed so that a predetermined dimensionally stable production is easy to perform and that the bag higher spreading forces and other loads can be exposed without risk by the contents during filling and during transport and handling the handle.

According to the invention, this object is achieved by a packaging bag according to the preamble of claim 1 with the characterizing features of claim 1. A separate strip of plastic film makes it possible to perform the head folding wall coherently instead of being sealed together from wall halves and thus to achieve a load capacity corresponding to the high strength of modern thin packaging films. A handle strip can be one or more layers provided with respect to a pleasant handling of thicker, possibly softer or fiber-reinforced material. This is also a greater rigidity of the handle to achieve that extend essentially over the entire length of the head wall and fold substantially over the entire length with this is to be connected by a sealed seam on the grip forces of a - usually middle handle area are distributed towards the head fold wall towards the ends of the head fold wall. This is important for the loading capacity of the packaging bag in the filled state and avoids, in particular for large packages, such as packaging for pulp products and other light goods with a corresponding length of the head wall, that the packaging lowers to the ends and warps to a "banana shape".

Although essential effects on the dimensional stability of the packaging in the filled state can be achieved even if the carrying handle extends only substantially but not completely over the entire length of the head folding wall and is sealed. Preferably, however, the carrying handle is provided in the entire length of the head folding wall and sealed together with the end edges of the head folding wall in the side separating weld. The separating weld results in a relatively high-strength welded joint, as the material is melted through and not only superficially melted.

The carrying handle then attaches with the ends of its lower edge to the downwardly directed tips of the gusset between the unfolded halves of the head folding wall and the overlying portions of the side walls and pulls them up. It thus counteracts an appearance hanging down on both sides of the two ends, which is at least visually unfavorable.

Furthermore, it is of interest from the load distribution to the ends of extending the handle over the everted during filling to a head wall longitudinal regions out to the area of Endzwickel in front of the side-Trennschweißnähten to the lowest possible acting on the handle longitudinal forces To have attack point on the packaging film. Incidentally, the extension of the carrying handle over the entire length of the head folding wall is a prerequisite for a simple manufacture of the packaging bag, in which the carrying handle "endless", i. can be supplied as a continuous belt and is divided only with a final attachment of the side-separating welds.

The carrying handle can be placed exactly centered on the head fold wall or so over the center of the head fold wall survive that the sealing seam between head fold wall and carrying handle lies on one side of the fold line of the head folding wall and the exposed portion of the carrying handle on the other side. However, this has the disadvantage that the carrying handle, which is generally much thicker and thicker, has to be folded with the head folding wall when the packaging bag is folded flat in the underfilled state. In contrast, an embodiment of the packaging bag is preferred, in which the carrying handle extends altogether together with its sealed end edge on one side of the center fold of the head fold wall. To the accumulation of material thicknesses, which is given in the head wall in particular with a handle made of thicker material, an additional thickening is avoided by folding a carrying handle, which would be unfavorable especially in the flat folded empty state of the packaging bag in a stacking.

The carrying handle can be specified not only in its film thickness regardless of the film of the rest of the packaging bag, it can also be given regardless of the production of the other bag with a handle selectable shape and with a Oberkantenkonturierung, the contouring example, in the region of a handle opening a can provide sufficient width or height, while this width or height of the handle can leak to the two side-Trennschweißnähten out. The carrying handle can be formed from a single-layer film strip, which is then used only in one layer. A single-layer film strip at least partially constant strip width but can also be folded in two layers or in total - for example in the region of the handle - double-layered and sealed together with a downwardly folded back longitudinal edge double-layered before attaching it to the top of the head with a simple sealing or adhesive seam.

The unfilled packaging container is on a (lower) side, the head wall opposite, open and thus provides a filling opening, which is to be closed after filling. For a simple closing operation by means of a separating weld, sufficient protrusions of the plastic film are provided, which are pressed from the bottom to the bottom, approximately from both sides, and welded together.

For this purpose, provided for the formation of a bottom sheet can be designed with uneven protrusions in order to pull apart the initially flat superimposed films of a packaging bag for filling easier. Then, a wicket perforation may be provided at the edge of the most protruding film to provide the empty packaging containers in a stack on a filling machine.

The plastic film to be considered here is generally a mono-film, such as a polyethylene film, which is sealable on both sides. For the production of empty packaging bags and also for welding the filled bags also multi-layer films can be used, which are designed to be sealed together only on one, namely for the inside of the packaging bag side. The handle of typically thicker (foil) material is in total or at least with a surface layer of a sealable with the film packaging bag material form.

The above-mentioned object is further achieved by a method for the production of plastic bag packaging bags with a carrying handle on the head folding wall and an open bottom area for filling by a film web during a pass through a machine along a given for a fold line in a central region of the film web Pass line is covered with a continuous, preferably stronger, foil strip for carrying handles or with a chain of handles made of sealable plastic film and joined by hot sailing, then to obtain in a continuous folding process within the machine longitudinal folding, which surrounds the carrying handle or handles on both sides and which is then subdivided by transversely directed to the film web separating welds in three-sided closed packaging bag for separation.

Fig. 1:

Ansicht eines unbefüllten, flach zusammengefalteten Verpackungsbeutels,

Fig. 2:

Ansicht des Verpackungsbeutels nach Fig. 1 im befüllten und bodenseitig für die Anbringung einer Schließnaht zusammengefassten Form,

Fig. 3, 4 und 5:

Schematisch dargestellte Fertigungsschritte bei der Herstellung des Verpackungsbeutels nach Fig. 1 und 2.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below. In the drawing show:

Fig. 1:

View of an unfilled, flat folded packaging bag,

Fig. 2:

View of the packaging bag behind Fig. 1 in the filled and bottom-side form for the attachment of a closing seam combined form,

3, 4 and 5:

Schematically represented manufacturing steps in the production of the packaging bag according to Fig. 1 and 2 ,

The in Fig. 1 When folded flat packaging bag 1 has a handle 2 made of a suitable for handling the packaging bag 1 stiffer and generally also thicker sheet material, while the packaging bag 1 is otherwise formed from a single, folded piece of thin sealable film. This film is in the empty state according to Fig. 1 two-ply to two main walls 3, 4 on each other, wherein the underlying main wall 4 is visible only with a bottom-side strip, while the main walls 3, 4 on the opposite (upper) side in a head folding wall into each other, in the empty state between the main walls 3, 4th folded double-folded and up to a broken bottom fold line 5 is flat with two wall halves between the main walls 3,4. Between the superimposed halves of the head folding wall of the handle 2, near the fold line 5 is welded to one of the wall halves. The carrying handle 2 extends in the present example over the entire length of the fold line 5 and is firmly bound together with the halves of the folded head fold wall on both sides in separating welds 6, 7.

The different length of the main walls 3, 4, of which the latter protrudes with a supernatant with respect to the overhead main wall 3 and protrudes with wicket holes 8 (holes for support pins), has only meaning for a machine filling. The holes 8 enable standardized provision of the packaging bag 1 in the stack, lined up on corresponding stacking pins. The lower edges 9, 10 of the main walls 3, 4, which are offset from each other downwards, also facilitate the separation and gripping of the superimposed films of a packaging bag for filling. The films of the packaging bag are on the bottom side, ie not connected to each other in the region of the lower edges 9, 10 and accordingly provide a filling opening.

In the filled state according to Fig. 2 (Shown without contents) is desired a cuboid shape, for which the packaging bag is already designed in the empty state and which is advantageous for a space-saving storage and handling of goods. In this case, the head folding wall to an overhead flat wall 11, while lateral vertical edge strips of the main walls 3, 4 and side walls 12, 13 transverse to the main walls 3, 4, said edge strips on a vertical center line of the side walls 12, 13 collide and are firmly connected to each other by the separating welds 6, 7.

In this molding process from the flat folded empty bag to the filled packaging bag is formed at the upper end of the side walls 12, 13, a three-shaped gusset with down-facing tip, which is on the outside of the only pronounced by the filling side wall 6, 7 covered, but on the inside a part the head fold wall, folded down, covering both sides of the original course of the head fold edge 5. In this gusset and the adjacent ends of the carrying handle 2 are involved, which thus set against the head fold wall 11 lower.

The carrying handle 2 is welded on a continuous sealing seam with the head folding wall 11 on one side along the fold line 5 and also incorporated into the side-separating welds 6, 7. Opposite the unfolded head folding wall 11 with a horizontal orientation, it is erected for handling upwards and can then be detected, for example in a grip hole 14.

The carrying handle 2 is formed in the present case of a polyethylene film, which is much thicker and stiffer than the film of the walls of the packaging bag. At its upper edge, it has a contouring, which is spread over the handle hole 14 and narrowed to the two ends. Advantageously, the carrying handle 2 can also be at least partially executed approximately in the grip area, double-layered. For this purpose, the film of the carrying handle 2 can be folded back at an upper edge down and sealed at the free end edge again on the carrying handle film.

The Fig. 2 shows so far not the final shape of the package, as over the filling projecting film areas of the main walls 3, 4 and the side walls 2, 13 only by (not shown) gripping tools tightly contracted below the filling to a closing line on which then a separation weld 15 the Main walls 3 and 4 and also recessed areas of the side walls 12 and 13 to a closed bottom 16 summarizes. This is a mechanically fast and easy to perform closing process that is easy to set up in bottling plants.

Regarding the machining of an unfilled packaging bag according to Fig. 1 is in Fig. 3 - With interruptions - a generally unwound continuously from a parent roll foil web 21 predetermined width shown, which is typically performed to save space within a machine processing space around pulleys and is subject to continuous or even clocked operations processing.

The film web 21 has an overall width which corresponds to the extension of the main surfaces 2, 3 and the head folding wall 11 in a vertical section parallel to the separating welds 6, 7. In a central region of this film web 21 is an imaginary pass line 22 - corresponding to the fold line 5 in Fig. 1 - Provided opposite to the film web 21 with a certain inequality according to the different lengths of the main walls 3 and 4 of the packaging container 1 to be produced. The film web 21 consists of a thin polyethylene film with a thickness of for example 40 microns, as it is to be used for light packaging and in view of the achievable high strength of the film is also sufficient for the packaging of light goods.

According to Fig. 3 Along the pass line 22 to one side a continuous strip 23 is placed from a suitable material for carrying handles, which may include 14 already in the intended for the production of packaging containers rapport grip holes 14 and in the same repeat on an outer edge 15 as shown in FIG Fig. 1 can be contoured. Alternatively, the grip holes 14 but also be stamped after inserting the strip 23 in the head fold 11.

The strip consists of a relative to the film web 21 sealable material, so at least on the film web 21 facing outer layer with the polyethylene of the film web welded, but can also be made entirely of the same material. Otherwise, however, the strip 23 may also consist of foamed, fiber-reinforced, embossed or otherwise deformed material, as long as it can be welded continuously and firmly to the film web 21 with a lower edge strip 25.

For sealing the lower edge strip 25 to the film web 21 here is a heat-sealing roller 26, rotatable about an axis 27, shown, with which a continuous seal is to be achieved. It is understood that other welding methods can be used, such as a melting of the surfaces to be welded by a hot air nozzle, which is directed into the gusset between the supplied handle strip and the film web 21 and thus a heat seal with the heated sealing roller 26 by the relatively strong handle material avoids, so that the strip 25 then only with a - possibly cold - roll or the like must be pressed.

In the present example, a strip 23 is supplied for the handle in continuous form and sealed at the edge of the film web 21, although it is understood that individual prefabricated carrying handles in a shortened form, possibly with gaps can be fed and sealed in the order of a chain.

The film web 21 passes through the sealing of the handle material a series of folding operations and folds by means of baffles ("folding areas") and forming rollers. According to Fig. 4 the film web is double-folded along the pass line 22 folded flat, wherein the film strip 23 terminates for the carrying handles with a folding edge 28 along the pass line 22.

In the further pass, the film web 21 is inverted together with the handle strip 23 in the longitudinal direction, so that the folding edge 28 of the film web 21 is folded and that on both sides of the folding edge 28, a film strip 29 and 30 in half the width of the (everted) head folding wall 11 Carry handle strip 23 receives flat between them.

The thus configured film web already conforms to the vertical section configuration of the packaging bag Fig. 1 - In the unfilled state - from the packaging container according to Fig. 1 to be separated by attaching separating welds 6 and 7. These separating welds, which, unlike sealing seams, melt through and sever the superimposed film layers, produce a continuous, firm connection between the layers of the thin bag film and possibly also the thick handle film.

Preferably, the in Fig. 1 and 2 shown wicket holes 8 introduced in the course of the separation by the attachment of the separating welds, to then stack the individual empty packaging.

Claims (13)

Packaging bag (19) made of plastic film, which is flat collapsible in the unfilled state and in the filled state to form in an at least approximate parallelepiped shape, with two mutually parallel main walls (3,4), with two intermediate side walls (12,13) into which extending from both main walls (3,4) and each connected by a side-separating weld (6,7) connected foil areas and with an unfilled state between the main walls (3,4) and the side walls (12,13) to be folded and the main walls (3.4) connecting top side head fold wall (11), one of the head fold wall (11) opposite, open in the unfilled state gap between the main walls (3,4) forms a filling opening in the filled state of the packaging bag (1) with a separating weld is close, wherein a carrying handle (2) made of plastic film on the upper side to the head fold wall (11) approximately centrally to this and in the folding direction of the head fold wall (11) is arranged to extend and parallel to the main walls (3,4) along the head fold wall (11), characterized in that the carrying handle (2) formed of a separate strip of plastic film and along a lower edge (25) is attached with a sealing or adhesive seam on the head fold wall (11) over substantially its entire length. Packaging bag (1) according to claim 1, characterized in that the carrying handle (2) is sealed together at both ends with two-sided end edges of the folded head folding wall (11) in the side separating welds (6,7). Packaging bag (1) according to claim 1 or 3, characterized in that the carrying handle (2) with a sealed or glued lower edge (25) on one side of a central fold of the head fold wall (11). Packaging bag (1) according to claim 1, 2 or 3, characterized in that the carrying handle (2) has a handle opening (14) in a central longitudinal region. Packaging bag (1) according to claim 4, characterized in that the carrying handle (2) is formed on one of the sealing seam opposite extending upper edge with an upper edge contour. Packaging bag (1) according to claim 5, characterized in that the upper edge contour has a widening of the carrying handle (2) in the region of the handle opening. Packaging bag (1) according to one of claims 3 to 6, characterized in that the carrying handle (2) is formed from a single-layer foil strip. Packaging bag (1) according to any one of claims 3 to 6, characterized in that the carrying handle (2) is double-folded at least in the central longitudinal region at the top and double-sealed at a folded down longitudinal edge double-layered. Packaging bag (1) according to claim 8, characterized in that the folded carrying handle (2) includes a reinforcing insert. Packaging bag (1) according to any one of claims 1 to 9 with a parallelepiped filling and at least one filling opening to a bottom closing separation weld, are connected by the film projections of both main walls (3,4), characterized in that the separating weld each end towards the ground also transposed overhangs of the side walls (12,13) miterfasst. Packaging bag (1) according to claim 10, characterized in that the projections of the side walls ((12,13) pulled together and welded in a line with the projections of the main walls (3,4). Method for producing plastic bag packaging bags (1) with a carrying handle (2) on a head folding wall (11) and a floor area open for filling, the method providing a passage through a machine to which a film web (21) is continuously fed along a throughput line predetermined for a fold line (28) in a middle region of the film web (21) (22) with carrying handles (24) made of at least one side sealable film in continuous or in successive piece form and is connected by heat sealing or gluing, after which the film web (21) in the longitudinal direction along the pass line (22) to a handle strip of film on both sides folded longitudinal folding is folded and the folded film web with the carrying handles (2) by transverse to the film web (21) directed separating welds in three-sided closed packaging bag (1) is subdivided for separation. A process for the production of packaging with packaging bags (1), which are manufactured according to the method of claim 12, then filled by one of the head wall (1) opposite filling opening from approximately parallelepiped while a flat unfolded head fold wall (11), two of film areas on both sides of Separating welds formed in one of the head wall corresponding width side walls (12,13) and two lying between the side walls (12,13) main walls (3,4) form, after which initially protrusions of the side walls (12,13) folded around each other and together with then against each other folded overhangs of the main walls (3,4) are combined in a separating weld.

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