WO2013087216A1

WO2013087216A1 - Side-gusseted bag made of film

Info

Publication number: WO2013087216A1
Application number: PCT/EP2012/005166
Authority: WO
Inventors: Klaus Huckriede; Glenn Andrew SPENDLOW
Original assignee: Bischof + Klein Gmbh & Co. Kg
Priority date: 2011-12-16
Filing date: 2012-12-14
Publication date: 2013-06-20
Also published as: CA2874781A1; RU2014128938A; DE202011109209U1; US20150104120A1; EP2791022A1

Abstract

A side-gusseted bag (1, 22) made of film is disclosed, having two main walls (6, 7) and side-gusseted walls (8 to 11; 23, 24) lying therebetween on the periphery; said side-gusseted walls can be folded flat into a V-shape parallel to a longitudinal direction between two main walls (6, 7) lying on top of one another. The main walls (6, 7) encompass, in a head region (2, 28), a grommet (4, 33) with two opposing fastening surfaces for the film and the two sides of the grommet (4, 33) are also directly connected with one another in a head joint (5, 32). The side-gusseted bag is designed for complete filling as a liner in an outer container for production with standard machine means in such a manner that a plurality of side-gusseted walls (8 to 11; 23, 24) are arranged between the main walls (6, 7), at least on one side, and that the side-gusseted walls (8 to 11; 23, 24) are connected to one another or to the main walls (6, 7) in the head region (2, 28) and are bounded by diagonal seams (17, 18; 30, 31), which converge diagonally partially at one end and partially at the other end of a head seam (5, 32) bounded at a central region on both sides of the grommet (4, 33) with correspondingly spaced gusset lines (20, 21) of the side-gusseted walls (8 to 11, 23, 24).

Description

Side gusset bag made of foil

The invention relates to a gusseted bag according to the preamble of claim 1. Side gusset bags made of film, in particular plastic film, the circumferentially formed with two main walls and two intermediate gusset walls and upper and lower sides are limited by transverse seams or reclosures, are common in everyday life. A gusseted bag for receiving pasty or liquid substances - albeit with imperfectly formed gussets - can be seen from EP 1 362 797 B1, in which the bag is closed on the top side with a transverse top seam, in which a spout is sealed in the form of a cap closure. Spouts of this type typically have a weld-in or seal-in area, in which opposite mounting surfaces allow a wrinkle-free installation of the film and an attachment to a load-bearing and tight closure.

The form of the gusseted bag shown in the cited document is intended to give as wrinkle-free transitions between the bag made of film and the spout.

Nevertheless, the previously known bag, from its rectangular basic shape, tends to form a filling shape with gusseted and pocket-shaped areas which prevent filling without air pockets and emptying without liquid nests.

In contrast, there has been a considerable interest in material-saving and with respect to the liquid filling inert film packaging, which are easy to fill and empty completely. Such containers

CONFIRMATION COPY Both as a stand-alone container as well as a lining or inner bag for Umbehälter solid form such as cardboard, wood or metal containers into consideration, in which the inner container can be collapsing emptied and thereby possibly ensure an air lock. Wine containers make use of this, for example, which, with a large filling volume and correspondingly long emptying times, avoid impairments of the wine due to the admission of air. At the same time, there is an interest in rendering the production of such gusseted bags reliably reliable by means of mechanical means, moisture-proof and unbreakable, and in particular also inexpensive.

The object of the invention is hereafter, a gusseted bag as a closed, provided with a spout container so that it is suitable as a liquid container for full filling and complete emptying, but nevertheless can be created in conventional manufacturing processes and machines uncomplicated, fast and unbreakable , Wherein the shape should also be folded flat for a compact arrangement in shipping and storage.

According to the invention, this object is achieved by a gusseted bag according to the preamble of claim 1, starting with the characterizing features of claim 1. While the conventional four-sided gusseted bag is designed for a cuboid shape to be achieved when filling with granular material, for example, but which bulges and warps when filled with liquid and which otherwise forms corners and pockets, an increase in the thickness is already evident. Number of suitable to achieve a polygonal polygonal shape and thus a better approximation to a deliberate rounding of the circumference. Even a pentagonal cross-sectional shape adapts much better to a circular shape formed at least approximately by a fluid internal pressure than a quadrangular or square cross-sectional shape. The increase in the area is achieved by a larger number of gusseted panels, which, as in the conventional four-sided gusset bag, can adopt a flat arrangement with major surfaces and intermediate folded side walls.

In this case, an increase in the Seitenwahdzahl both for the sake of ease of mutual production as well as uniform folding position of the gusseted bag on each two gusset walls under each side of the main walls to give preference to achieve a better rounding than with a hexagonal cross-sectional shape with a hexagonal cross-sectional shape , In the same senses even higher numbers of walls can be provided, which, however, then the production cost is greater without the approximation of the polygonal outline could be increased to a circular cross-section to the same extent.

To avoid nests or pockets when filling or emptying of such a gusseted bag oblique seams between the gusset walls and between the side gusset walls and the main walls contribute significantly, at least the inside of the head area provided with a geometry in the form of a smooth ceiling wall. Such a ceiling wall can, for example, be fitted to match a container with flat floor and ceiling surfaces. ben. However, it is also possible, by means of smaller angles of the oblique seams with respect to the longitudinal direction, to align the design of the inner shape in the head area in a conical manner on the grommet in order to ensure a complete and easy inlet and outlet.

Although gusseted bags with (three or) five peripheral sides are known from US Pat. No. 7,147,597 B2, they are not flat and can be folded smoothly. There, all oblique seams in the head area are aligned on a single central point to connect a spout with all peripheral sides. These compounds are not easy to produce by machine and lead to not wrinkle-free foldable wall transitions.

An inventive gusseted film bag can in particular be produced simply with the aid of sealing seams if the film as a whole is sealable or at least provided on one side with a sealable layer. A composite film with a polyolefin, in particular polyethylene, as inner layer, which opens up a good sealability on the inside, as well as a mostly thinner, firmer and also higher melting outer layer of polyester, is customary and also usable in this respect. This combination of materials also has the advantage, in practice, of being able to seal the sealing seams one above the other between the side fold walls and between the side fold walls and the main walls through a plurality of foils, without the outer sides being subsequently interlocked. would be welded and would stand out a refolding of the bag from a flat position out into the filling position.

It goes without saying that, depending on the requirements of impermeability and chemical resistance, it is also possible to use glueable or weldable metal foils or composite foils with a metal layer instead of plastic composite foils.

The production of such a gusseted bag is possible on machines that already manufacture conventional gusseted bags with two main walls and only two individually gusseted sidewalls. The production is initially directed to a (circumferentially closed) hose, which can be created both by the fact that a single film web is folded with the opposite side edges and closed with only one longitudinal seam to a hose, as well as in an alternative conventional form at the main walls and gusseted walls are brought together as strips and joined together by a plurality of longitudinal seams to form a tube. In conventional side gusseted bags have been partially used as support seams at 45 ° to the longitudinal direction in some cases, but the side gusseted walls usually have not limited but only internally formed. However, with a greater number of gusseted panels in accordance with the invention, the oblique seams typically extend at an angle of less than 45 ° to the longitudinal direction. The more precise determination of the angle takes place from the point of view of whether a flat-flat head area - for adaptation to a top flat Umbehältnis - or a funnel-shaped head area - for better complete filling and emptying - is provided. In the plan-level head design form the oblique seams of the unfolded side walls and main walls in the top level triangles, which join together to form a flat surface. Notwithstanding a uniform division of a pentagon, hexagon or a polygon by matching, converging inwards triangles is to be considered that two opposite walls are not pointed, but to collide with an at least short top seam, in which the spout is to be integrated. Accordingly, typically two larger triangles are provided with the tip cut off for the top seam, which are usually provided for the main walls, with the oblique seams diverge only from the opposite ends of the top seam.

The above configuration also applies in principle to a conical or funnel-shaped formation of the side-fold bag in the head area, the triangular shapes of the walls wiping the oblique seams becoming more acute-angled, the more strongly the conical shape is to be formed.

In the case of all freedom of design, it is particularly obvious to design the side-fold walls on mutually equal circumferential widths, in which the adjacent side-fold walls in the folded-in state also overlap one another congruently. gene, while the main walls to the length of the top seam have greater width.

The main walls and gusseted walls can also be provided with longitudinal seams between them, if the manufacture of the side gusset bag is designed from a single film web and insofar actually would require only a single longitudinal seam. However, longitudinal seams between the main walls and the gusseted walls or between the gusseted walls may be useful for stiffening the container and for more controlled collapse upon evacuation. Preferably, the longitudinal seams are then provided as outwardly projecting fin seams. This makes it possible to provide the gusseted bag in an inherently smooth manner and without unnecessary wetted surfaces. The outwardly projecting fin seams are also desirable in side gusseted bags, which are to be used as inner container use and thus counteract undesirable adhesion of the inner container to the outer container.

The formation of a bottom area, the head area opposite bottom, can be done under very similar aspects, although a central top seam is unnecessary, since in the ground regularly no spout or other

Emptying opening must be provided. In this respect, even in the bottom area tapered triangles between oblique seams can be specified. Preferably, however, the bottom area is designed congruent with the head area in consideration of a smooth folding of the bag. The "congruent" formation of the floor area prevents the head area Also, not to make the floor about flat when the head area is pulled out conical and vice versa. The usual designations with "head or" bottom "mentally refer to a (filling) position with top-side spout, even if the bag for emptying is quite upside down.

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

1 side view of a first embodiment (partially broken away),

2 is a plan view of the embodiment of FIG. 1,

3 shows a cross section of the embodiment according to FIG. 1 and FIG. 2 at the beginning of the

Collapsing,

4 enlarged detail IV of FIG. 3,

5 cross-section through the gusseted bag in folded form,

Fig. 6 top view of the folded shape of FIG. 5 and

Fig. 7 side view of a second embodiment of the gusseted bag.

In Fig. 1 and Fig. 2, a gusseted bag according to the invention in an unfolded form is generally designated 1. He has a hexagonal outline of six in width not or not significantly different from each other walls that adjoin each other circumferentially and converge to a head portion 2 and a bottom 3 towards the center. The head area is equipped in the middle with a nozzle 4. The gusseted bag 1 is formed from an inner sealable film, in the present case a plastic composite film having a polyethylene (PE) inner layer and a polyester (PET) outer layer. In this film, the nozzle 4 is sealed tightly and firmly in a top seam 5 with two opposite sealing surfaces as mounting surfaces. The spout shown can be closed with a screw cap, but could of course also be provided with a stopper or other closure.

The gusseted bag 1, which is substantially unfolded into a drum shape, has a hexagonal outline for filling with fluid, in which it attaches to a

approximates cylindrical shape formed by juxtaposed side walls, which converge in the head area 2 and the bottom 3 like pie pieces towards the center. However, these do not come together in a single central point, but each encounter one of two ends of the top seam 5, which allows the two-sided sealing a spout. The top seam 5 is formed between the upper capped triangular tips of two walls 6, 7, which are given a little wider than the remaining walls 8, 9, 10, 11, in order to match the geometry of the side lengths and angles. Basically, however, also sides of the same circumferential width can be specified here, as long as the arrangement of a spout is guaranteed in the head area.

Fig. 3 shows the sides 8, 9, 10, 11 slightly bent in parallel to a centrally from the bottom 3 to the head portion 2 to thinking longitudinal direction. This implies that these walls are supposed to be gusseted walls which allow the gusset to fold up. Tenfaltenbeutels allow as conventional side folding bags with four walls. This is not only a space-saving destacking and shipping given, but also a flat production, such as a single film web, which is folded and sealed in the longitudinal direction with the opposite edges, or a production of strips, in the width of the respective walls assembled and sealed together with seams.

In the former case, in which initially a tubular shape is created from a single film web, peripheral longitudinal seams - apart from a single hose-forming seam - are not absolutely necessary. Nevertheless, in particular, the enlarged view of FIG. 4 shows a deliberately sealed longitudinal seam 12 between the gusset wall 9 and the wider wall 7, which is incorporated for stiffening and contouring and does not require a tight seal, since the film passes through uncut at this point and only a solid Stiffening fold receives.

Fig. 5 shows the gusseted bag 1 in a folded state in which the wider walls 6 and 7 lie flat as main walls and the gusseted panels 8, 9, 10, 11 are folded approximately halfway in the longitudinal direction and lie therebetween. Since the main walls 6, 7 are wider than the uniformly wide side fold walls 8, 9, 10, 11, the half-folded side fold walls do not collide in the middle, but remain longitudinally along fold lines 21, 22 drawn in FIG. Fig. 6 shows the folded shape of the gusseted bag 1 in a flat plan view with overhead main surface 6, the parallel side edges 13, 14 extend in the longitudinal direction according to an arrow 15 in Fig. 1 and are stiffened there with parallel, laterally projecting seams 15, 16 , The seams 15, 16 converge toward the top seam 5 with oblique seams 17, 18 which, in the case of a hexagonal side-folding bag of the type considered here, can be seen on the line of an approximately equilateral triangle. The bottom 3 is formed in the folded shape of FIG. 5 and FIG. 6 also triangular, with a congruent to the top seam 5 provided bottom seam 19 (without spout) is provided for reasons of symmetry, so that there are parallel fold lines and congruent seams. The folded form according to FIGS. 5 and 6 thus forms a "package" with superimposed fold lines and seams. It goes without saying that quite deliberate modifications are possible, for example, to offset the fold lines and the seams in the folded state against each other, if this is preferred for better distribution of fold lines or seams.

The above-described embodiment in the manner of a "drum" with a flat bottom and head area is particularly in applications in which such a gusseted bag is to be used as an "inliner" in a firmer Umbehältnis of cardboard, wood or metal, even with a round-cylindrical inner shape well with a hexagonal gusseted bag. Even a pentagonal shape would have significant adaptation advantages over the conventional gusset bag with four peripheral surfaces. On the other hand, it becomes obvious if desired, you can design and produce an even polygonal shape on the same line.

Outwardly finned seams such as the seam 12 in Fig. 4 have not only proven to be advantageous for contouring the fold lines and stiffening the side gusset bag, but also help, with inwardly smooth Umbehältern exclude an inside adhesion of the film of the gusseted bag.

In Fig. 7, a variant of a gusseted bag is generally indicated at 22, in which two in the representation to be seen gusset walls 23 and 24 with a fin seam 25 between each other and with fin seams 26, 27 opposite adjacent main walls (not shown) can be seen, the Gusset walls 23, 24, as well as the other gusseted walls and the main walls, converge in a head region 28 and in a bottom 29 toward the center in a funnel shape. This is of interest for liquid-filled gusseted bags, especially in the head area 28, to facilitate full filling and complete emptying. Such a bag is like the gusseted bag of Fig. 1 to 6 interpreted in the same way flat collapsible, resulting in only between the oblique seams such as oblique seams 30, 31 elongated triangular end portions of the main and gusseted walls with slimmer angles between the seams. At these angles, in turn, a head seam 32 is to be specified, into which a spout 33 is to be enclosed from two sides in order to provide the film of the side gusset bag with a fixed filling and pouring-out injection-molded part.

Claims

protection claims

A gusseted bag (1, 22) made of film having two main walls (6, 7) and circumferentially intermediate gusset walls (8 to 11, 23, 24) parallel with two superimposed main walls (6, 7) and V-shaped between the main walls to be folded flat to a longitudinal direction, wherein the main walls (6, 7) in a head region (2, 28) include a spout (4, 33) with two opposite attachment surfaces for the film and on both sides of the spout (4, 33) in one Head seam (5, 32) are also directly connected to each other, characterized in that between the main walls (6, 7) at least on one side a plurality of side fold walls (8 to 11, 23, 24) are arranged and that the Seitenfal- tenwände (8 to 11 23, 24) are connected and confined between each other or with the main walls (6, 7) in the head region (2, 28) by oblique seams (17, 18, 30, 31) which are inclined partly to one and partly to the other End of a middle Bereic h on both sides of the spout (4, 33) limited head seam (5, 32) with correspondingly spaced fold lines (20, 21) of the gusset walls (8 to 11, 23, 24) converge.

A side gusseted bag according to claim 1, characterized in that the oblique seams (17, 18; 30, 31) extend at an angle of less than 45 ° with respect to the longitudinal direction (15) when the bag is folded flat.

3. gusseted bag according to claim 1 or 2, characterized in that the oblique seams (17, 18) are aligned with each other so that the unfolded gusseted walls and the main walls in the head region (2) form a flat surface.

4. gusseted bag according to claim 1 or 2, characterized in that the unfolded side gusset walls (23, 24) and the main walls converge conically to the top seam (32).

A side gusseted bag according to any one of claims 1 to 4, characterized in that the gusset panels (8 to 11; 23, 24) have an equal circumferential width and the main walls (6, 7) have a width opposite to the circumferential width of gusseted panels is greater by the length of the top seam (5).

6. gusseted bag according to one of claims 2 to 5, characterized in that the main walls (6, 7) and side gusset walls (8 to 11) respectively

between one another with longitudinal seams (12, 15, 16).

7. gusseted bag according to claim 6, characterized in that the longitudinal seams (12, 15, 16) protrude in the form of fin seams to the outside.

8. gusseted bag according to one of claims 1 to 7, characterized in that the main walls (6, 7) and the gusset walls (8 to 11, 23, 24) in a NEN the head portion (2, 28) opposite the bottom region (3, 29) are also connected to each other with converging oblique seams.

9. gusseted bag according to claim 8, characterized in that the unfolded gusset walls (8 to 11) and the main walls (6, 7) complement each other in the bottom region between the oblique seams to a flat surface.

10. gusseted bag according to one of claims 1 to 9, characterized in that the film is a multilayer composite film with a sealable or weldable layer on the inside.