SE525077C2 - Stand bag with reinforcement along the lower edge of the side wall - Google Patents

Abstract

A package comprising a bag of flexible sheet material which, prior to being filled, is laid flat and comprises two opposing side walls ( 2 ) substantially in contact with each other, which side walls are tightly sealed along opposing side edges ( 5 ), the bag also comprising a bottom wall ( 3 ) which is folded double and has two fields ( 31 ) facing each other received between the lower parts of the side walls ( 2 ), the parts of the end edges of the bottom wall being sealed together. At least in the vicinity of the fold line ( 32 ), the side edges of the bottom wall are joined to the side walls at their side edges and a string of springy, elastic material ( 4 ) is connected to a respective side wall ( 2 ) at its lower edge ( 21 ), along substantially the entire length of the lower edge of the side wall when the package is in its flat state, and the two material strings are separated from each other. The package is filled by inserting a substantially leaf-shaped pouring mouthpiece into the flat neck of the pack-age and introducing liquid through the mouthpiece, after which the neck of the package is sealed. The packages may be joined together in a coherent chain of packages attached to each other at their side edges.

Description

The object of the invention is to provide a package which, despite the fact that the sheet material of the package substantially lacks its own rigidity, still gives the package, as standing on a horizontal surface and as filled with flowable material, yet has a stability such that it can stand on its own, and, albeit with some caution, can be lifted to allow a user to drink from or pour through the upper generally horizontal edge of the opened package. The purpose thus includes to eliminate the mentioned inconveniences. The object is achieved by the invention.

The invention is defined in the appended independent packaging requirement.

Embodiments of the invention appear from the appended dependent claims on the package.

When filling a flat-laid package according to the invention with liquid, the package rises towards a rounded cross-section, at the same time as the double-folding edge of the bottom wall moves downwards towards a plane which is clamped by the two material strands. The end edge connection of the bottom wall to the connecting seam of the side walls, at least in the vicinity of the original double fold of the bottom wall, produces a certain forced control of the cross-sectional shape of the lower part of the liquid-filled package. The width of the package is defined by the width of the bottom wall. The material strings lead to a stabilization of the packaging. It appears that the material string is given a generally U-shaped curvature on a horizontal surface and thereby defines a stabilized transition between the vertical side wall of the liquid-filled package and the horizontal bottom and keeps this transition taut. It then appears that the string prevents the side wall from sinking and unfolding to merge into a horizontal bottom wall. 10 15 20 25 30 35 s nu o: 00, o. Nu: .II- .I. . ,, 'q o 0 I ann I 0. . . ge 0 Q o 0 OO 525 077 3 cooaan I 0 Q 0 oo oo soon 0 u I 0 0 0 0 1 0 0 nu Even in horizontal directions extending through the interconnecting lines of the side walls, a stabilization of the package against collapse in said direction is obtained . The strands may optionally be formed by a series of string pieces, which are arranged at short intervals. However, it is preferred that the strands be substantially full and extend along the entire lower edge of the flattened package, on the lower side thereof.

In one embodiment, the material strands can be applied as prefabricated strands, which are connected to the side walls.

Alternatively, the strands may be applied as a strand of a non-solidified plastic material, for example a strand co-extruded with the film or a strand of hot hot-melt adhesive. In other embodiments, a thin resilient strip of plastic film can be attached to the respective side wall adjacent to and along its lower edge, by conventional attachment techniques. The material strand can thus be fastened with radiation technology, ultrasonic technology, adhesive dressings, soldering technology, welding technology, double-sided adhesive tape and the like.

The flattened unfilled package can be made as a chain of packages, where the packages of the chain connect to each other at the side edges of their side surfaces.

The packages can thus be connected to each other with weld seams, which interconnect the side walls of the packages and which in their longitudinal center area may have a separation instruction, ie a line of weakness which allows easy separation of the packages from each other, or may have a section which may extend up to near the top edge of the package.

The packaging chain is suitably produced from a plastic film web, which in its manufacture is provided with the mentioned material strands by extrusion or the like. Furthermore, similar straight strands can be extruded along the side edges of the web. The web is then flattened to a W-profile, so that the lower strands are given the 10 15 20 25 30 35 see I Qcc a n lb Inc: .oo. : C00 '00. C. lv o n 0 I I n u I n uno n n l. n q o c o a 0 I I,, 00: ont I 0 I Û g. 2: z. I I: 1 z .f ',,' 'gp co Ino coon near said positions. The web can then be sealed with transverse seams to form the chain, whereby separation instructions or cuts can be introduced into these seams.

The material strands at the opening edge of the packages stiffen the opening part of the package and facilitate the handling of the packaging chain and the packages. The strings can be connected to the packages only at their longitudinal center area.

The opening edge portion of the packages including the material strands above the neck closure of the package can be separated after the neck closure and returned to the production site for the web, where these residues can be processed for use in the material strands at the lower edge of the side walls of the packages.

The recycled material usually has a slightly higher stiffness than the basic material of the film web and can therefore be used to advantage to form the mentioned material strands in web.

A package according to the invention can be filled by orienting it in the flattened state with an opening upwards, whereby a liquid filling nozzle having a large width (amounting to 70% or more, preferably about 90% of the length of the package) and small thickness is inserted between the side walls parallel. with these and a piece is lowered into the package, liquid being introduced through the nozzle to fill the bag. Because the bag is initially substantially flattened, even after the insertion of the filling nozzle, there is initially no volume of air in the package, so no foaming occurs in the package during liquid filling, of course provided that the filling liquid or filling line does not contain a significant amount of gas. The nozzle is substantially formed of resilient elastic material and has, in the relieved condition, two substantially abutting, usually flat walls, which are arranged slightly flexible, so that the nozzle is widened by the flow of liquid therethrough. This means that 10 15 20 25 30 35 .- I ': nu' _. z I ... I I I C 0 0 i '' pg IIOI IOIO f ~ _v m »m cv -q» i U'l the nozzle is to some extent self-closing when the liquid flow is interrupted.

A series of such nozzles may be provided to move along the chain or respective package to fill the packages during transport. The nozzles can then be arranged to move in a circulation path, synchronously with the chain / packages and thereby be able to be inserted into or pulled out of the packages during their forward transport.

After filling the package, the neck is closed perpendicular to the side edges to form a sealing seam, which extends between the side edges of the side walls. The end portions of this sealing seam, together with adjacent triangular packaging portions, can be flattened and folded down against the side walls of the package or against the upper end wall of the package, in a conventional manner. Of course, the package can be sealed with other sealing means.

In the flattened state, a chain of packages can be led past a filling apparatus, from which nozzles are inserted into the heels of the unfilled bags for separate filling of the bags.

The invention will be described in the following in an exemplary form, with reference to the accompanying drawing.

Fig. 1 shows a flattened packaging bag according to the invention, before filling.

Fig. 2 schematically shows a section taken along line II-II in Fig. 1.

Fig. 3 shows a side view of the package according to Fig. 1 in a liquid-filled state, before closing. 10 15 20 25 30 35 S 2 5 Û 7 7 6 ¿° '¿§ ::; _-: j = {I = Fig. 4 schematically shows a view taken along line IV-IV in Fig. 3.

Fig. 5 shows a chain of packages according to Fig. 1 as running past a liquid filling station and a sealing station.

Fig. 6 schematically shows a web of plastic film, which can be used as starting material for a package according to Fig. 1.

Fig. 7 shows a set of folding wheels for forming a blank for a packaging chain from a plastic film web.

Fig. 8 is a perspective view of a closed filled package according to the invention.

Fig. 6 schematically illustrates a W-profile folded, flat-laid web 1 of thin flexible plastic film material. The web comprises two side walls 2, the free edges 22 of which are located next to each other. A central portion 3 of the web 1 is folded in between the side walls 2 via folding lines 21 and has in its middle portion a folding line 32. The lines 21 and 32 delimit the field 31.

Longitudinal sections of the web 1 are welded sealed across the longitudinal direction of the web, preferably perpendicular to the longitudinal direction, and cut along the cutting sections. Along the lower edge of each side 2, along the substantially full width of the longitudinal section 1 ', a resilient elastic material string 4 is applied. you can see the weld seams 5, the fold line 32 and the fold line 21 in the flattened condition of the longitudinal section 1 '.

This longitudinal section 1 'forms a packaging blank, where the portion 3' forms the bottom of the package after filling in a flowable f 15. 7 7 if :: "=:. :: § ==: .- °: = material, for example a liquid in the upper part of the package, ie in between the walls 2 via the edges 22. The liquid that is filled up- The fields 31 form a flat bottom surface of the package, in a plane which accommodates the package, which goes towards a round cross-section. connects to the side weld seams 5, initially follows the seams 5 but is deflected to the said plane.

The side panels 31 are tightly connected to each other, and are also connected to the side walls 2, at least in the area of the connection of the double fold 32 to the weld seam 5, preferably all the way down to the edges 21.

The strand 4 can be applied as a "hot-melt" strand, which in the hot state is laid out on the respective side wall 2 at the edge 21. The flattened package according to Figs. , is inserted from above between the opening edges 22 in the flattened package, after which liquid is injected through the nozzle 7. Since the flattened package 1 'does not contain any air volume, there is of course no air volume in the package 1' which is displaced out of the package, as the liquid introduced therein. As a result, the liquid filling can take place quickly and substantially without foaming.

When the liquid is introduced into the package 1 ', the distance between the edges 21 increases and the fold line 32 will shift to a horizontal plane which is clamped by the edges 21 and the material strands 4, the fields 31 also lying in this plane. The bottom wall 3 of the package will normally rest on a substantially flat horizontal surface, the package 1 being stable, ie having no tendency to fall over, since the material strands 4 offer a substantial stabilizing effect on the package, the bottom area of which occupies that in fig. 4 showed the shape. 10 15 20 25 30 35 f; 5 0 7 7 8. * Iï - i? íï = The cross section of the package in liquid-filled state approaches a rounded shape, 3 width, connected to the weld seams 5. which is determined by the circumference of the package, the bottom and the fact that the ends of the bottom panels 31 are From Fig. 5 it can also be seen that the packages 1 'are formed by the web 1 by means of transverse sealing seams 50 with a central line of weakness 1, along which the packages 1 'can be separated. The chain of continuous packages 1 'can be separated before or after the liquid filling of the packages. Fig. 5 shows that after filling the chain is led past a pair of welding jaws 8, of which only one is shown in Fig. 5, between which the packages 1 'are sealed with a weld seam in the vicinity of the upper edge 22. Thereafter the filled sealed packages can be separated as indicated by line 9 in Fig. 5.

The exemplary embodiment relates to the packages being formed on the basis of an elongate web with a cross-sectional profile according to Fig. 6, but it should be clear that the blanks for the package according to Fig. 1 can be formed in another way, the starting blank usually having a W- formed cross-section and sealed with two parallel welds 5. It is of course also possible to establish the panels 2, 3 in the package 1 'in another way, by connecting welding separate sheet panels and applying the elastic strands 4 as shown on the finished package 1 .

The package can be filled with liquid material such as powder, cream, liquid or the like.

If the package is given relatively large dimensions, especially at a height of approximately the same order of magnitude as the circumference, at pack volumes of 0.5 l or more, certain care should be taken when handling the package after opening. It is then conceivable to provide a cup-like support device, in which the package can be placed in connection with it being emptied by drinking out or pouring out. As mentioned, the chain of packages 1 'can be manufactured from a plastic film web. In the manufacture of this web, the stiffening strands 4 can be established as continuous strands 4 ', which are formed in connection with the extrusion of the film web.

As can be seen from Fig. 7, the film web can then be folded with conventional folding equipment, for example a pair of coaxial wheels 121, between which the periphery of a further wheel 32 projects from below, and suitable guide webs, so that the plastic film web is transformed into a W profile as indicated. In this case, the extruded strands 4 'must of course be placed in the immediate vicinity of the lower periphery of the wheels 121, shown in Fig. 7, so that they occupy the reported position in the raised package.

Figures 6 and 7 further show that the film web can be provided with longitudinal beads 23 in the vicinity of its free edges. The beads 23 stiffen the opening edge parts of the packages 1 and also form a support, with which the packages can be hung on and possibly can be displaced along the corresponding support before and / or after filling. The edges of the film web including the beads 23 can be separated after they have fulfilled their function and can then be returned to the production plant where the film with the beads 4 'and 23 is connected.

Finally, Fig. 8 shows that the end portions of the cross-closure fin 81 and the adjacent corner portions of the upper part of the package are flattened to form triangular corner flaps 82, the side walls 52 of the package, alternatively folded up and fastened which are suitably folded against and fastened to the top surface.

Claims (8)

10 15 20 25 30 35 525 077 w: '=:.:' § * == ë-: I§i:; š: Patontkrav A package comprising a bag of flexible sheet material, which before material filling is laid flat and comprises two opposite and substantially abutting side walls (2), which are mutually tightly closed along opposite side edges (5), the bag comprising a bottom wall (3), which is double-folded and has two abutting fields (31) received between the side walls (2) in their lower part, and the opposite parts of the end edges of the bottom wall being closed to each other, the bottom wall side edges are at least in the vicinity of the double fold line (32) of the bottom wall connected to the side walls at their side edges (5), characterized in that a resilient elastic material string (4) is connected to a respective side wall (2) in its lower edge (21) along substantially the entire length of the lower edge of the side wall in the flattened state of the package, the material string defining a stabilized transition between the liquid-filled package no vertical side wall and horizontal bottom, and that the two strands of material are separated from each other. Packaging according to claim 1, characterized in that the material strand (4) is a strand which is integrated in or applied to the sheet material. Packaging according to claim 1 or 2, characterized in that the packaging is formed by a longitudinal section of a web of a thin plastic film, which is flat-weighted to a W-shaped cross-sectional profile, and which is provided with separate transverse weld seams (5). Packaging according to one of Claims 1 to 3, characterized in that the neck of the packaging is closed with a closing seam (81) in the longitudinal direction of the section and that the end section of the fin (81) is together with adjacent corner portions of the packaging. nu uno .g .uno. "| c..oqoon IP °. nuu _ nn GW ll Û zz ° '. i .onncol I' I z '' o .u '.,' ',,' u; man ' : zone uno. uu flattened to form triangular portions, which are folded against and attached to an adjacent packaging wall. Chain of packages according to one of Claims 1 to 4, characterized in that the packages (1 ') are interconnected longitudinal sections of the web (1). Chain according to claim 5, characterized in that the longitudinal sections (50) of the web (1) connecting the packages (1 ') each have a line of weakness (51). Chain according to Claim 5 or 6, characterized in that the chain is formed by a plastic film web folded to a W-profile, which has material strands along the lower side edges of the packages, and in that the web is closed with transverse seals (5). Chain according to claim 7, characterized in that the plastic film web has along its free edges longitudinal strands (23), the packages. or beads which are interconnected