WO2012052670A2

WO2012052670A2 - Flexible container for liquid, and manufacturing and filling method

Info

Publication number: WO2012052670A2
Application number: PCT/FR2011/052420
Authority: WO
Inventors: Isidro Martins Fernandes
Original assignee: Bag2Pack Sarl
Priority date: 2010-10-18
Filing date: 2011-10-17
Publication date: 2012-04-26
Also published as: FR2966133B1; FR2966133A1; WO2012052670A3

Abstract

The present invention relates to a flexible container including at least two film layers adhered or welded together along a line comprising a valve portion in which an outlet channel, for pouring the contents of said container after opening, is defined. According to the invention, the welding or adhesion line surrounding the inner end of said channel has, on each side thereof, at least one projecting portion that projects toward the inside of the container relative to the line surrounding said channel. The invention further relates to a film strip forming a continuous sealed sleeve, the stacked films of which are connected together by a welding or adhesion line forming the valves of a plurality of such containers. The invention also relates to a method for manufacturing such a strip and for filling and closing containers by means of said valvular strip.

Description

"Flexible liquid container, method of manufacture and filling"

The present invention relates to a flexible container comprising less than two film thicknesses bonded or welded together along a path having a valve portion in which is defined an outlet channel for pouring the contents of said container after opening. According to the invention, the weld or bonding pattern surrounding the inner end of this channel has on each side at least one projecting portion which projects towards the interior of the container with respect to the path surrounding said channel.

It further relates to a film strip forming a sealed continuous sleeve whose superposed films are interconnected by a weld or bonding pattern forming the valves of a plurality of such containers.

The invention also relates to a method of manufacturing such a strip, and to filling and closing containers from this valved strip.

For packaging and dispensing liquids, especially in the field of food processing, there are flexible containers based on flexible sheets that are welded or glued together tightly around the liquid to be dispensed. The liquids concerned are of various viscosities, for example very liquid such as water or milk or fruit juice, or of a much less fluid consistency such as fruit compote or curd or concentrated milk.

These flexible packages are particularly economical in material and manufacture, and often used in disposable form, they also have the advantage of being able to shrink as they are emptied, without the need to leave large amounts of area, which improves its conservation after opening.

Packaging have existed for a long time for example in the form of flat bags that inflate in the form of cushions once full, or welded wagons in the form of tetrahedrons as in the document FR 1 529 229 dating from 1969. The opening is done in general by cutting or tearing an angle of the bag which then acts as spout.

There are also packages with an outlet channel specially adapted for pouring the contents into a container or directly in the mouth. Such containers sometimes comprise a separate insert made of injected plastic, making it possible to pour more conveniently and also to close the container after opening, as for example in the document US 2010/215294. Such a patch, however, represents a significant cost compared to the cost of packaging and product. It is also likely to become detached which can be a source of embarrassment, or even be swallowed in particular by children who have risks such as suffocation.

One solution is proposed in document EP 1 615 843, which proposes a bag provided with an outlet channel with parallel walls extending transversely towards the outside of the bag. This document proposes to realize one or more obstacles in front of the interior entrance of the canal. This obstacle is achieved by interconnecting the two sheets forming the walls of the bag, at a sufficient distance from the entrance of the channel to allow the content to bypass the obstacle, while being sufficiently ready for the channel to close and limit the possibilities of air intake or liquid flow.

This solution, however, has drawbacks, for example to use. Indeed, the obstacle in front of the entrance of the channel greatly limits the possible flow, and also requires to seize the bag in a particular way to be able to pour the content, to the point that it proves useful to print explicit instructions on the bag to inform users.

An object of the invention is to overcome the disadvantages of the prior art, and in particular to improve the following points:

- simplicity and ergonomics of use;

- avoid or limit the learning required for use;

- simplicity and economy of manufacture;

- limit the quantities of materials used and discarded, both in production and use;

- freedom of choice of the materials used;

Another goal is also to allow greater flexibility of the manufacturing and packaging process. It is interesting, for example, to separate the manufacture of packaging, which is a production activity of rather, the volume of the plastics industry, and the use of packaging for packaging products, which can often be usefully produced by producers of products, in smaller quantities and closer to the production sites.

Presentation of the invention

The invention provides a flexible container (1), of the type comprising at least two film thicknesses glued or welded together along a path defining an inner region (10) sealed filled or can be filled with liquid, including food. This pattern, or weld or bonding bead, is here described as a planar pattern, as in a configuration of the vacuum container, for example after emptying the contents.

In this type of container, this pattern comprises a so-called valve portion in which the trace extends transversely outwards, relative to the perimeter of the sealed volume, defining an outlet channel that can be used to pour the contents of said container. after opening. This pattern may be, for example, a fully drawn outline, for example when the container is intended to be opened by removal of material at the outer end 192 of the channel, typically by tearing or tearing or cutting off a portion of the outer end. of the canal.

Typically, such a channel may have sidewalls made by portions of the path and forming between them an angle of less than 45 ° or 30 ° over a length of at least 10 mm or 20 mm.

According to the invention, the weld or bonding pattern surrounding the inner end 191 of this outlet channel has on each side of its longitudinal axis at least one protruding part called the inlet spout, which projects towards the inside of the container by relative to the rest of the route surrounding this canal.

As detailed below, the presence of this projecting portion produces the unexpected effect of causing deformation of the films constituting the container, in the valve portion thus formed around the outlet channel. This deformation is in several directions that are difficult to model at this stage. It seems to comprise on the one hand an inclination of the entire valve relative to the initial plane of the remainder sachet, approximately around an axis in the plane of the valve and transverse to the axis of the canal; and on the other hand a camber of the valve itself which takes a curvature around one or more axes approximately parallel to the axis of the channel.

All of these deformations have the effect of pressing the two films against each other, particularly in the region of entry of the channel, and are probably further combined with the external atmospheric pressure on the walls.

It follows that the channel remains substantially closed even after the package is started. This deformation seems to exist as long as the container is not empty, not only when the container is placed valve up but also even more strongly when the container falls, whether it is overturned on its support or falling from a container. certain height. On the other hand, the flow remains very easy, for example by pressing on the body of the container in any way.

This provides an interesting result for the preservation of the product and also to avoid spurts untimely, with good ergonomics of use and effortless learning, for a simple and economical container for manufacturing and filling.

According to another aspect, the invention provides a method of manufacturing one or more flexible containers of the type described above. The method according to the invention then comprises at least one so-called valving step, comprising at least one welding or bonding to one another of said superimposed films along a determined path for producing the valve portion of one or more containers. as outlined above.

In the same spirit, the invention also provides a so-called valved band for producing flexible containers filled or can be filled with liquid, including food. This valved strip comprises at least two superimposed continuous films interconnected by a weld or bonding pattern forming the valves of a plurality of containers as described above. This band may be "continuous", for example a length of several tens of meters rolled up or folded on itself, or take the form of separate portions each containing several containers.

According to a feature, the method according to the invention comprises a realization of a so-called valved band comprising at least two films continuous superimposed interconnected by a weld or bonding pattern forming the valves of a plurality of containers as outlined above.

According to another feature, which may or may not be combined with the preceding one, the method comprises a process for filling containers, starting from a valved band as explained above, and including a successive iteration of the following steps:

- Performing a so-called lower weld or bonding between them superimposed films of said valved band, positioned to form a sealed lower portion of a container to be filled;

filling said sealed lower part;

- Achieving a so-called upper weld line or bonding them superimposed films of said valved band, positioned to seal said container.

It is then easier to dissociate the industrial manufacture and in large quantities from the packaging of the filling, by delivering on demand the quantities of valved strips corresponding to the needs to the different producers of liquid, which then need only the filling machine. and sealing the containers. The transportation needs of the products are limited while limiting the necessary investments for these producer-packers.

Various embodiments of the invention are provided, integrating, according to all of their possible combinations, the various optional features set forth herein.

Other features and advantages of the invention will emerge from the detailed description of an embodiment which is in no way limitative, and the appended drawings in which:

- FIGURE 1 is a perspective view of a container, according to an exemplary embodiment of the invention, once filled and closed, when folding the flaps under the bottom of the container;

FIGURE 2 is a perspective view of the same finished container, possibly after opening, in a lying position illustrating the type of deformation providing the automatic closing of the outlet channel; FIGURE 3 is a scale plan view of a heating electrode used to make the solders producing the valve of the same container;

FIG. 3a is a partial scale view showing the flare angle of the opening and a possible mode of evaluation of this angle;

- FIGURE 4 and FIGURE 5 are respectively partial and full scale views of the same container, in section in the plane of the welds, restored to the flattened state and without folding of the flaps of the base; FIG. 6 is a scaled plan view of a portion of a film before making the valved strip for producing containers such as that of FIG. 1, in which the different faces of the containers and the zones of the container are represented. impression possible;

FIGURE 7 is a scale plan view of a portion of a strip for making containers such as that of FIGURE 1;

FIGURE 8 is a schematic top view illustrating the manufacturing process of the same valved band;

FIGURE 9 is a schematic perspective view of the process of filling and closing the containers from the same valved band.

In general and unless otherwise indicated, the dotted lines represent either hidden parts or already removed elements (see FIGURE 9). The mixed lines represent either axis or quotation marks or future elements (future cuts, see FIGURE 7 and FIGURE 9).

Description of the preferred embodiment

The films used may be of any flexible material, transparent or not, for example simple or complex films of types known in the field of agribusiness. Tests have been particularly successful using complex transparent films with a thickness of 75 μm comprising a layer of polypropylene between two layers of polyethylene. The invention is however also applicable with other flexible materials, transparent or not, printed or not, such as nylon or metal layers or PY-metal films.

FIG. 1 schematically shows in perspective a container 1 according to the presently preferred embodiment of the invention, once filled and closed, during the folding of the flaps 132 and 142 under the bottom of the container. Although it is a flexible material, the volumes are schematized by lines for the sake of simplicity and clarity of the figure.

FIGURE 2 shows the same filled and finished container in a recumbent position. The deformations caused by the specific shape of the valve 11 around the channel 19 appear to comprise a camber or inclination Cl of the valve relative to the remainder of the container, and a camber C2 within the valve 11 and around the axis of the channel 19.

Tests have shown that such a container, once opened by cutting D18 of the end of the channel, can be so reversed or dropped from a certain height without water flow, or a very small amount.

FIG. 3 is a scalar representation of a heating electrode 2 as used for producing the solders producing the valve 11 of the same container 1. FIG. 4 and FIG. 5 represent the container obtained, after closure by lateral seals 13 and 14, but cut in the plane of the welds, unfilled or restored to the flattened state and without folding the flaps of the base.

The raised parts El i of the electrode 2 are preferably covered with a Teflon film. They come together to weld the two superposed films, by heating applied against another symmetrical electrode, or against a flat counter-electrode for example covered with a Teflon cloth. The electrode is traversed in its thickness by coolant conduits, which control the overall temperature of the electrode and accelerate cooling.

Preferably, the cut ends (at least on the side of the channel) in a direction parallel to the rolling direction of the two films, which allows to obtain an easier tear during an opening by hand.

The housing E18 pass a blade just after welding, which achieve a linear cut 18, 18 'of the two films, here continues, opening outward of the contour of the films, and which stops in a portion 182 where the films are not interconnected. This cutout 18, 18 'is positioned so as not to cut the drawing portion 190 forming the wall of the outlet channel 19.

This gives a better resistance to involuntary tearing.

The right portion of the electrode 2 shown comprises a pre-cut form E182 which does not overflow the position of the future cut D14 (mixed line). It carries out an opening precut comprising at least one linear cut 18 of the two films, continuous or in dotted lines, emerging towards the outside of the contour of the films and progressing towards a portion 190 of the weld or glue line delimiting the outer end 192 of the outlet channel 19 crossing:

firstly a region 181 where the two films are glued or welded,

and then a region 182 where the two films are not connected to each other.

This gives a greater width and better homogeneity of the part taken in hand to tear the outer end 192 of the channel 19 and unseal the container.

The left part of the electrode 2 represents here a precut variant producing a precut according to another option, in which the space E182 'overflows on the future cut line D13.

As seen in FIGURE 3 and FIGURE 4, the valve 11 has a protruding portion 111 and an inner portion 10 of the container 1 in the plane of the welds on both sides of the channel 19.

According to a presently preferred feature of the invention, each of these protruding parts, or inlet nose 111, 111 ', is connected to the remainder of the path 112, 112' of the wall surrounding the channel 19 in a shape having a concave portion 113 directed inward 10 of the container 1.

The two wall portions 112, 112 'immediately surrounding the channel 19 form between them an acute angle A112 on the side of the interior of the container, here at two symmetrical angles B112 and B112' distributed around the axis A19 of the channel.

This angle is typically between 176 ° and 120 °, or even between 170 ° and 160 °, for example an angle A112 of 168.8 ° corresponding to symmetrical angles B112 and B112 'of 5.6 ° each. This angle Al 12 seems to contribute to the automatic closing of the channel, better than for one by

The inlet nozzles 111, 111 'protrude from the wall 112, 112' surrounding the channel 19 with a length H1 of between 2 and 10 mm, or even between 3 and 6 mm, and for example 4.5 mm. Preferably, they each have a width LU I less than 8 or even 5 mm, and for example 3 mm

In this embodiment, the arrangement of the spouts 111, 11 'leaves a volume accessible in the concave portion 113, which may contain a certain amount of liquid. It is possible that this characteristic contributes to the closing of the channel.

The inner end 191 of the channel 19 has an inwardly flared opening 10 1.

This inner opening 191 of the channel 19 is preferably flared over at least the length 111 of the spouts 111, 111 '. This flare preferably has an angle of between 5 ° and 30 ° on each side, or between 10 ° and 20 °.

FIGURE 3a a possible mode of evaluation of this flare angle A191, by measuring this angle on the straight line M 191 median to the course of the flared wall, that is to say cutting the course of the flare in a position forming between the straight line M 191 and the path to the lowest point Pl ll two zones of equal areas distributed around this straight line M191.

According to the shape configurations, the walls 1910 of the flare may also have a radius of curvature of between 6 and 15 mm; or the inner opening 191 of the channel 19 may have a width greater than the narrowest width of the channel of between 15% and 40%, and for example 35%, ie 2.2mm on each side for a channel of 13mm wide.

The container comprises a base portion 12 on which it can be placed in a stable and non-flowable position when the container is filled and the channel 19 is open. This base is here formed a fold of film and shown in hatching. It could also be done by welding or gluing of the same type as the rest of the layout. As illustrated in FIGURE 4 and FIGURE 5, the pattern 13, 14 of the future lateral welds moves away, beyond the valve portion 11, in a direction diverging outwards at an angle A131, A141 , included on each side between 10 ° and 45 °, or between 15 ° and 25 °, and worth for example 19.5 °.

The shape of the pattern of the future lateral welds 13 and 14 has around the base 12 two acute angles A132, A142, preferably between 80 ° and 45 °, or between 75 ° and 65 °, and for example 80.5 °. The ends of these angles, after filling, can be folded in the plane of the drawing and in folds P13, P14 transverse to this plane, in two flaps 132, 142, thus forming a bottom for the stability of the container 1. These flaps could also be folded differently, for example towards each other towards the bottom, or upwards by moving away from each other.

This folding flaps gives the container thickness and provides a certain rigidity in a plane transverse to the plane of the welds, which gives a better stability to the container when it is placed on its base 12.

This characteristics also seems to contribute to the deformation allowing the automatic closing of the channel.

In the tests shown here, the complete layout of the container forms an equilateral trapezoid whose bases are respectively 194 mm base 12 and 40 mm valve 11 over a height of 230 mm, providing a capacity of approximately 500 ml.

The pattern is obtained by a weld of width LS substantially constant, between 1 and 6 mm, or even between 2 and 4 mm, for example 3 mm, on two superposed films each of thickness between 50 and 100 pm, here 75pm.

The channel 19 has a width chosen according to the viscosity of the contents and the desired flow rate and, for a content of between 100 and 1000 ml of liquid of viscosity similar to water, is between 7 and 20 mm, and even between 9 and 17 mm. , here 13 mm.

FIGURE 6 to FIGURE 9 illustrates the manufacture and filling of containers of the type described above. FIG. 8 illustrates the process of manufacturing a so-called valved strip 4, consisting of a continuous flattened continuous sleeve whose two thicknesses are already welded together at the locations of a series of valves 11a-1c, which will thus be able to be used to produce a plurality of containers Ic-lc.

The realization of this valved strip 4 comprises, before the embodiment 53 of the drawing of the valves 1 -11c, at least one folding step 51 on itself of a continuous strip of film 3, coming from a roll 30. The two edges of this continuous film web 3 are folded inwardly, each in at least one longitudinal fold P51a, P51b continuous to form a flattened continuous sleeve, prior to making the pattern of the valves 1a-1c.

The constitution of the sleeve by folding makes it possible to handle only one source 30 of film 3. It also makes it possible to use the two plies P51a and P51b to directly make the base 12 and the closure of the outer end 192 of the channel 19 , which provides better reliability and a better surface appearance compared to a welded closure. The base can also unfold more easily once the container is filled.

FIGURE 6 shows a portion of continuous film 3, of longitudinal axis shown in the horizontal of the figure, before making the valved strip for producing containers as described above. In this figure, the cross-hatched portions represent the different faces of the containers and the possible printing areas on the outer surfaces of the future container.

We see that the containers are arranged head to tail and contiguously. This arrangement allows a saving of material and a good efficiency of the filling process.

In the preferred embodiment, the valves 11a-1c are formed in positions alternately on one side and the other side of the longitudinal axis A4 of said strip 4, and preferably in a position adjacent to the edge. These positions are determined to correspond to the valve portions 1-l lc of a plurality of successive containers la-lc to achieve in a transverse arrangement on the strip 4, with respect to their axis connecting the valve to the base. In the embodiment presented here, the valve plot is made by welding (53) by pressing the two superposed films between at least one heating electrode (2, 2a, 2b) and at least one counter-electrode.

The choice of the heat weld is made possible by the simplicity of shape of the welding pattern of the container and the valve and the use of a thin film, and allows greater simplicity than other processes such as welding by ultrasound.

Once folded film strip 3 3, valves 1a-1c are formed by a repetition of at least one welding operation 53 or bonding a repeating pattern 2 within said pattern, triggered in positions 2a, 2b determined by a detection of at least one pre-existing repetitive marker 31a-31c on the two superposed film thicknesses.

FIGURE 7 shows a portion of a valved strip for making containers 1a-1c as described above.

The tests have currently allowed a production rate of the order of 4000 to 4500 bags per hour on a machine.

FIGURE 9 illustrates the process of filling and closing containers la-lc from the same valved strip 4.

The valved band 4 is unwound from a roll 40, and is brought to a vertical position pointing downwards. A filling pipe 62 is introduced between the two overlapping edges 3a and 3b.

As it descends, these two edges are welded 60 one above the other, above the outlet orifice of the filling pipe 62.

For each of the successive containers 1c-1c, the following operations, described here for the container 1a, are then carried out:

- Performing a so-called lower trace 61c of welding between them superimposed films of said valved strip 4, positioned to sealingly connect the bottom of a valve 11c located on one side of the strip, with the bottom of the fold P51b , located on the other side of the strip and providing a sealed base 12c for a container 1c, thereby forming a sealed bottom portion 10c for said container;

filling 62c of said lower part 10c of this container;

- Achieving a said upper 63c weld line between them of these superimposed films, positioned to tightly connect the top of this same valve 11c with the top of the same base 12c sealed, sealingly closing said container.

Typically, the filling 62c is made discontinuously between two containers 1b, filled successively for example by measuring the amount poured and optionally leaving a gaseous volume in addition to the liquid inside said containers after closure.

Preferably, the upper trace 63b made to close a container lb constitutes the lower trace 61c of the next container, which allows good productivity.

Current tests have allowed a rate of filling and closure of the order of 2000 bags per hour.

Of course, the invention is not limited to the examples that have just been described and many adjustments can be made to these examples without departing from the scope of the invention.

Claims

1. Flexible container (1), of the type comprising at least two film thicknesses glued or welded together along a path defining an inner region (10) sealed filled or can be filled with liquid, including food, said route comprising a so-called valve portion (11) in which said trace extends transversely outwardly delimiting an outlet channel (19) that can be used to pour the contents of said container after opening, characterized in that the weld pattern or bonding around the inner end 191 of said channel has on each side of the longitudinal axis A19 of the channel, at least one protruding portion (111, 111 ') said inlet mouthpiece protruding inwards (10) of the container by relative to the path (112, 112 ') surrounding said channel.

Container (1) according to claim 1, characterized in that the inlet spout (111, 111 ') is connected to the remainder of the path (112, 112') of the wall surrounding the channel (19) in a form having a concave portion (113) directed inwardly of the container (1).

3. Container (1) according to any one of claims 1 to 2, characterized in that the two wall portions (112, 112 ') immediately surrounding the channel (19) form between them an acute angle (A112) on the side from inside the container.

4. Container (1) according to any one of claims 1 to 3, characterized in that the inlet nozzles (111, 111 ') protrude from the wall (112, 112') surrounding the channel (19). a length (H11) of between 2 and 10 mm, or even between 3 and 6 mm, and each have a width (LU I) of less than 8 or even 5 mm.

5. Container (1) according to any one of claims 1 to 4, characterized in that the inner end (191) of the channel (19) has an inwardly flared opening (10) of said container, on at least sure the length (D 11) of passing the nozzles (111, 111 ') and at an angle of between 5 ° and 30 ° on each side, or even between 10 ° and 20 °.

Container (1) according to any one of claims 1 to 5, characterized in that it comprises a part forming a base (12) on which said container can be placed in a stable position and without flow when the container is filled and that the channel (19) is open, and in that the path (13, 14) moves away, beyond the valve portion (11), in a direction away from the angle (A131, A141) included on each side between 10 ° and 45 °, or between 15 ° and 25 °.

7. Container (1) according to claim 6, characterized in that the base is obtained by a shape of the path having around the base two acute angles (A132, A142) whose ends, after filling, can be folded in the plane plotted (P13, P14) transverse to said plane in two flaps (132, 142) thus forming a bottom for the stability of the container (1).

8. Container (1) according to any one of claims 1 to 7, characterized in that it has an opening precut comprising at least one linear cut (18) of the two films, continuous or dotted, opening to the outside the contour of the films and progressing towards a portion (190) of the weld or glue pattern delimiting the outer end (192) of the outlet channel (19) through at least one region (181) where the two films are glued together or welded followed by at least one region (182) where the two films are not connected to each other.

9. Strand (4) (continuous) called valved for the production of flexible containers filled or can be filled with liquid, especially food, characterized in that it comprises at least two superimposed continuous films interconnected by a weld pattern or adhesive forming the valves of a plurality of containers (1, la-lc) according to any one of claims 1 to 8.

Strip according to claim 9, characterized in that the valves (Hal le) are formed in positions alternately on one side and the other side of said strip, determined to correspond to the valve portions of a plurality of successive containers (la-lc) to be produced in a transverse arrangement on the strip.

11. A method of manufacturing one or more flexible containers, of the type comprising at least two film thicknesses glued or welded together along a path defining a sealed inner region filled with liquid, especially food, said route having a portion said valve (11) wherein said trace extends transversely outwardly delimiting an outlet channel (19) that can be used to pour the contents of said container after opening, characterized in that it comprises at least one step said valving (5), comprising at least one weld (53) or a bonding to one another of said superimposed films in a predetermined pattern to achieve the valve portion (11, l la-l lc) of a or several containers (1, la-1c) according to any one of claims 1 to 8.

12. Method according to claim 11, characterized in that the realization of the welding or bonding valve pattern comprises at least one weld.

(53) by pressing the two superposed films between at least one heating electrode (2, 2a, 2b) and at least one counter-electrode.

13. Method according to any one of claims 11 to 12, characterized in that it comprises an embodiment (5) of a so-called valved strip.

(4) comprising at least two superimposed continuous films interconnected by a weld or glue pattern forming the valves (1a-1c) of a plurality of containers (la-1c) according to any one of claims 1 at 8.

Method according to claim 13, characterized in that the valves (1a-1c) are formed in positions alternately on one side and the other side of the longitudinal axis (A4) of said strip ( 4) and determined to correspond to the valve portions (lla-l lc) of a a plurality of successive containers (la-lc) to be produced in a transverse arrangement on the strip (4).

15. Method according to any one of claims 13 to 14, characterized in that the valves (lla-l lc) are formed by a repetition of at least one operation (53) of welding or bonding a pattern ( 2) repetitive within said pattern, triggered in positions (2a, 2b) determined by detection of at least one pre-existing repetitive marker (31a-31c) on the superimposed film (s).

16. Method according to any one of claims 13 to 15, characterized in that it comprises, before the embodiment (53) of the layout of the valves (lla-l lc), at least one folding step (51) on itself of a strip of film (3) continuous in at least one continuous longitudinal fold (P51a, P51b), thus forming the two superposed films.

The method according to claim 16, characterized in that the two edges of the continuous film web (3) are folded inwardly each in at least one continuous longitudinal fold (P51a, P51b) to form a continuous flattened sleeve, before the realization (53) of the layout of the valves.

18. Process according to any one of claims 11 to 17, characterized in that it comprises, from a valved strip (4) according to any one of claims 9 to 10, a filling process (6) of containers (la-lc) comprising a successive iteration of the following steps:

- Performing a so-called lower trace (61c) of welding or bonding together superimposed films of said valved strip (4), positioned to form a lower portion (10c) sealed a container (1) to be filled;

filling (62c) of said sealed lower part (10c);

- Achieving a so-called upper line (63c) of welding or bonding between them superimposed films of said valved band (4), positioned to seal said container (1c).

19. Method according to any one of claims 11 to 18, characterized in that it comprises, from a valved strip (4) according to claim 10, a filling process (6) of containers (la-lc ) comprising a successive iteration of the following steps:

- Performing a so-called lower trace (61c) of welding or bonding together superimposed films of said valved strip (4), positioned to connect sealingly the bottom of a valve (11c) located on one side of the strip, with the bottom of a longitudinal portion (eg fold P51b) located on the other side of the strip and providing a tight base (12c) for a container (1c), thereby forming a watertight lower portion (10c) for said container;

filling (62c) of said lower part (10c) of the container;

- Realization of a so-called upper line (63c) of welding or gluing together said superimposed films, positioned to sealingly connect the top of said valve (11c) with the top of said base (12c) sealed for said container (the ), sealingly closing said container (1c).

20. Method according to any one of claims 18 to 19, characterized in that the upper trace (63b) made during an iteration to close a first container (lb) is the lower trace (61c) of a second container (the) filled during the next iteration.