WO2021160565A1

WO2021160565A1 - Flexible container for conditioning waste

Info

Publication number: WO2021160565A1
Application number: PCT/EP2021/052967
Authority: WO
Inventors: Franck MILHEM
Original assignee: Linerbenne
Priority date: 2020-02-11
Filing date: 2021-02-08
Publication date: 2021-08-19
Also published as: FR3107041A1; EP4103494A1; FR3107041B1

Abstract

Flexible container (1) for conditioning waste, comprising: - an outer envelope (2), - an inner envelope (3) having a lower wall (20), an upper wall (21) and at least one lateral wall (22, 23, 24, 25), the inner envelope (3) being arranged inside the outer envelope (2), and comprising a first part (45) comprising the upper wall (21) and a first upper portion (46) of said at least one lateral wall (22, 23, 24, 25), a second part (47) comprising the lower wall (20) and a second lower portion (48) of said at least one lateral wall (22, 23, 24, 25), and a fastening (50) extending within said at least one lateral wall (22, 23, 24, 25) over at least part of the periphery of the inner envelope (3) and making it possible to connect said first (45) and second (47) parts of the inner envelope (3).

Description

Title: FLEXIBLE CONTAINER FOR WASTE PACKAGING Technical area

The present invention relates to the field of packaging waste. The term “waste” is used within the meaning of European Directive 2006/12 / EC of April 5, 2006 and designates any substance or object that falls within the categories appearing in Annex I of this directive, which the holder discards or which he has the intention or the obligation to get rid of.

It relates more particularly to the conditioning of waste resulting from asbestos removal from construction or public works.

It thus relates to a container, in particular flexible, for packaging waste, as well as to a method of manufacturing such a container.

Prior art

In the context of packaging waste, in particular asbestos, patent application EP 3,133,033 is known relating to flexible packaging of solid waste with a capacity greater than 5 m ³ , consisting of a mechanically resistant outer casing and an inner casing. dust-tight, each comprising a lid which can be closed on a pocket by means of closure so as to close the packaging in a leaktight manner using a system of flaps extending from the upper peripheral edge of the packaging, interposed between the outer casing and the inner casing and covering the means for closing the inner casing.

In the field of the invention, it is essential to be able to guarantee the tightness of the waste container when loading waste on a collection site, during transport and during unloading on a storage site, while controlling costs. Manufacturing.

The flexible containers conditioning the waste are placed in a metal skip during loading and transport. Certain skips can be unloaded, on the storage site, from the transport truck, in particular using an articulated arm of the Ampliroll® type, requiring a low inclination during the dumping, which makes it possible to maintain the integrity and therefore the tightness of the container.

However, generally, the metal bucket with a capacity of 32T housing the flexible container remains attached to the transport truck and a tipping of the bucket to unloading the flexible container with the waste is operated. In the latter case, the tilting angle is large, in other words the inclination of the bucket during the dumping is important, which causes sudden unloading and greatly increases the risk of damaging the flexible container, in particular by tearing.

AU 2013 202449 discloses a bag having a lower portion and a side portion extending upwardly from the lower portion and defining an opening. The lower part and the side part have an outer reinforcement layer, an inner reinforcement layer and an intermediate waterproof liner layer.

FR 3,083,220 describes a flexible container for packaging waste comprising an outer casing, an inner casing arranged inside the outer casing and a system for strapping the container. The strapping system can be tightened to locally create a constriction in the cross section of the outer casing and / or the inner casing.

There is a need to benefit from flexible containers making it possible to condition and transport, from a collection site to a storage site, in a resistant and sealed manner, waste, in particular asbestos waste or other essentially solid waste.

Disclosure of the invention

Flexible container

The present invention thus relates, according to one of its aspects, to a flexible container for packaging waste, comprising:

- an outer envelope forming the outer surface of the container and having, in its upper part, an opening which can be opened or closed,

an inner envelope delimiting an internal volume of the container for receiving and housing the waste, and having a lower wall, an upper wall and at least one side wall connecting the lower and upper walls, the internal envelope comprising, within the wall upper, an opening which can be opened or closed by means of a closure system, the inner casing being arranged inside the outer casing. According to the invention, the inner envelope comprises: - a first part comprising the upper wall and a first upper portion of said at least one side wall,

- a second part comprising the lower wall and a second lower portion of said at least one side wall, and

- An attachment extending within said at least one side wall over at least part of the periphery of the inner shell and allowing said first and second parts of the inner shell to be connected.

Thanks to the invention, the attachment made on the inner shell is located away from the closure system, thus improving the strength of the inner shell. Indeed, the proximity of the closure system with a fastening which would for example be made at the peripheral edge of the upper wall of the inner casing could form a zone of weakness of the inner casing. On the contrary, moving the closure system away from the fastener increases the strength of the inner shell and therefore of the container.

By "flexible container" is meant a container made of flexible material (s), generally based on polymer (s), which can be bent, folded, without breaking or being damaged. The relatively thin thickness of the envelopes as well as the materials that constitute them are chosen to obtain this desired flexibility.

References to an “upper” or “lower” part or wall or element are made by a visitor who observes the container when it is placed on the ground in its waste loading position.

The upper wall of the inner envelope is advantageously delimited by one or more upper edges which may also be called the upper peripheral edge (s).

The lower wall is preferably delimited by one or more lower edges which may also be called the lower peripheral edge (s).

The top and bottom edge (s) of the inner shell may not be marked. They can be delimited for example by a connection to the outer casing. The upper edge (s) can be identified by a predefined distance to the closure system and / or by a fold and / or by double-sided adhesive strips which can be attached to another envelope of the container, for example on the outer envelope. or a possible intermediate envelope. The term “attachment” is preferably understood to mean a permanent and sealed attachment. The fastening is preferably a weld, but it could be constituted by another type of fastening, for example a seam or a gluing. In the case where the binding is a weld, the first and second parts forming the inner casing are welded together, in particular at the level of the lower end edge of the first part and of the upper end edge of the second part.

By "fixing extending within said at least one side wall" is meant that the fixing is not confused with one or more upper edges delimiting the upper wall of the inner casing nor with one or more lower edges delimiting the lower wall of the inner shell.

The binding is advantageously present over the entire periphery of the inner envelope. In this case, the first and second parts of the inner shell are connected to each other only by the fastening, in particular the welding. The first and second parts of the inner shell respectively form an upper half-shell and a lower half-shell. They together form the inner envelope, when fixed together by said fixing. Such a configuration is advantageous in that it makes it possible to fix the closure system, in particular the zipper more easily, on the upper wall of the inner casing, in particular when the latter is of large dimensions, for example of greater length. at 5 m, or even at 8 m.

Alternatively, only a portion of the first and second parts of the inner shell is connected by the fastener, since, for example, the rest of the first and second parts do not have to be connected, being formed in one piece.

The binding advantageously extends substantially parallel to one or more upper edges defining the upper wall and / or to one or more lower edges defining the lower wall.

The binding may extend in an area located at a distance of at least one upper edge of the inner casing of between 5% and 90% of the total height of said at least one side wall, better still between 10% and 60%. %, even better between 15% and 55%, or even between 15% and 50% of the total height of said at least one side wall. The total height of the side wall is advantageously equal to the total height of the inner casing. The container may include a reinforcing strip fixed to said at least one side wall of the inner casing and at least partially, preferably completely, covering the attachment, in particular the weld.

In this case, the reinforcing strip comprises, for example, an adhesive on one of its faces in contact with the binding. The reinforcing strip advantageously comprises a fibrous reinforcement and at least one layer of a polymer.

In a particular embodiment, the inner casing has four side walls including a front wall and a rear wall and two side walls, the four side walls being traversed by the attachment, in particular the weld, which preferably extends substantially parallel to the upper edges of the upper wall. The front and rear walls can be bordered laterally, preferably substantially perpendicular to said attachment, in particular to said weld, two secondary fasteners, in particular secondary welds, connecting them respectively to the side walls, preferably over the entire height of the inner envelope.

Likewise, the outer casing may have an upper wall and a lower wall interconnected by four side walls.

The outer casing and / or the inner casing may have a parallelepipedal shape.

In addition to the outer casing and the inner casing, the container may also include an intermediate casing interposed between the inner casing and the outer casing. The intermediate envelope is preferably open. It may have a bottom wall and at least one side wall.

The intermediate envelope may be partially or totally devoid of a top wall.

The container may include at least one flap interposed between the outer casing and the inner casing and covering the closure system of the inner casing.

Such a flap can make it possible to form a seal for the closure system of the inner envelope, in particular when the container is filled with waste and when the inner envelope is closed. For this, the flap or flaps are preferably provided with fixing means, for example adhesive strips. The flap (s) can be fixed to the upper wall of the inner casing, for example using these fixing means, on either side of the closure system, in particular on either side of the zipper.

The flap (s) can be attached and fixed to the outer casing. This fixing of the flap (s) is preferably permanent and it is different from the aforementioned fixing means, when present.

In this case, the outer casing may have an upper wall comprising said opening, the upper wall of the outer casing being delimited by one or more upper edges, said at least one flap being fixed to the said edge (s). (s) upper (s), in particular by welding or stitching, inside the outer casing.

As a variant, the flap or flaps can be fixed to the intermediate envelope. As indicated above, they can be attached and attached to the intermediate casing, the attachment of the flap (s) preferably being permanent and different from the aforementioned attachment means, when present. Alternatively, the flap or flaps are made in one piece with the intermediate casing, forming at least a portion of the upper wall of this intermediate casing.

In this case, said at least one side wall of the intermediate casing can be fixed and / or connected, in particular at its upper end, to said at least one flap.

The flap or flaps are preferably not attached or fixed to the inner envelope, before filling the waste into the container and / or other than by the aforementioned fixing means.

The flap (s), when present, may be made of a polymer material, woven or not, in particular of woven polypropylene or of a polyethylene film. When the flap or flaps are made of polyethylene film, the latter may have a thickness of between 100 μm and 250 μm approximately. When the flap (s) are made of woven polypropylene, their basis weight may be between 100 and 200 g / m ² , in particular equal to approximately ^{110 g / m 2.}

The flap (s), when present and attached, may be attached by welding, sewing and / or gluing to the outer casing or to the intermediate casing.

The materials used to make the outer casing and / or the inner casing and optionally the intermediate casing can be chosen so as to allow the container to be mechanically resistant and dust-tight. The outer shell may comprise at least one polymeric material, preferably woven, for example a woven polypropylene forming a polypropylene (PP) web. It advantageously has mechanical strength properties to resist tearing. It can include areas that are thicker than others or include reinforcements, so as to locally reinforce the mechanical resistance properties. In particular, it may include reinforcements at the edges of the front and rear side walls, made for example essentially of PP. It may have a basis weight of between approximately 190 g / m ² and 300 g / m ² , in particular between 200 g / m ² and 270 g / m ² , depending on the dimensions of the outer casing. The tensile strength, measured according to the standard ASTM D638, in the warp direction can be between approximately 180 kg _f and 240 kg _f , or approximately 1765 N and 2355 N. The tensile strength, measured according to the standard ASTM D638 , in the weft direction can be between 170 kg _f and 240 kg _f approximately, or approximately 1665 N and 2355 N. The elongation, measured according to the standard ASTM D638, can be between 18 and 20% approximately, in the direction weft or warp.

The inner shell may comprise a polymer material, woven or not, in particular a woven polypropylene, a polyethylene or a polyvinyl chloride (PVC).

When the inner envelope comprises polyethylene (PE), the latter may be in the form in particular of a PE film or of a PE weave. The inner envelope advantageously has dust tightness. The inner casing preferably has walls substantially parallel to the respective walls of the outer casing, in the immediate vicinity of the latter optionally separated by the walls of the intermediate casing when present, within the container. These different walls together define the interior volume of the interior envelope, corresponding to the interior volume of the container. The inner casing preferably has a parallelepipedal shape, in particular if and when attached to the outer casing, if the latter has a parallelepipedal shape or to the intermediate casing. The thickness of the walls of the inner envelope can be between approximately 200 μm and 400 μm, in particular between 200 μm and 350 μm. A layer, in particular glued, of expanded PE can be attached to the interior surface at the level of the lower wall of the interior envelope. The inner envelope may include areas that are thicker than others, so as to locally reinforce the mechanical resistance properties. Alternatively, the inner shell may comprise a woven polypropylene, for example similar to that of the outer shell. Such a woven polypropylene can be treated so as to impart a seal to the inner envelope and therefore to the container using a lamination technique.

When present, the intermediate casing may comprise a polymer material, for example woven, in particular a woven polypropylene, for example less thick than that of the outer casing with a basis weight of between 100 g / m ² and 200 g / m ² , for example example equal to approximately 140 g / m ^2. The presence of the intermediate casing can make it possible to mechanically reinforce the container.

The outer and inner envelopes and, where appropriate, the intermediate envelope, are preferably interconnected, in particular two by two, in particular using double-sided adhesive tapes. The connection zones can be located on the side walls of the envelopes, for example in a low zone, in a central zone and / or in a high zone of the side walls. Such a connection makes it possible to give the container a hold, despite the fact that the envelopes are made of flexible materials. This can also make it possible to give a shape to the inner envelope, and for example to define the upper wall and / or the lower wall thereof.

The openings of the outer shell and the inner shell are preferably at least partially overlapped.

The opening of the inner casing may occupy a large part of the upper wall of the inner casing, and have three edges, for example in the shape of a U, of which the two longitudinal edges and a third edge, connecting them, in proximity. of the front or rear wall of the inner casing, substantially parallel thereto. The three edges of the opening are preferably provided with gear teeth to allow a zipper (or rack) of the opening which then forms the closure system of the inner envelope.

Likewise, the opening of the outer casing can occupy a large part of the upper wall of the outer casing, and have three edges, for example in the shape of a U, including the two longitudinal edges and a third edge, connecting them. , near the rear or front wall of the outer casing, substantially parallel thereto. The three edges of the opening of the outer casing are preferably provided with gear teeth to allow a zipper (or rack) of the opening. The outer casing can thus be provided with a closure system which is specific to it, along the opening, for example a zipper. When the outer and inner envelopes are provided with zippers, the latter may have a U profile of opposite orientation, on the top wall of the envelopes for example.

The present invention is however not limited to a particular type of closure system and other closure systems can be envisaged without departing from the scope of the invention, for example a system of loops and hooks cooperating with one another.

The intermediate envelope, when present, may not have a closure system.

The internal volume of the container, in particular of the inner envelope, may be greater than or equal to 3 m ³ , in particular 5 m ³ , in particular 10 m ³ , in particular 16 m ³ , or even 18 m ³ , in particular 24 m 3. m ³ , or even 35m ³ .

The inner casing may be provided, on its inner surface, in particular of the side wall (s), with a plurality of anchor points for tensioners, or elastic cables. These elastic cables can make it possible to secure the container to a metal bucket in which the container would be placed, in the open position of the openings of the outer and inner envelopes, in order to facilitate the loading of waste from the container.

Container manufacturing process

Another subject of the invention, according to another of its aspects, in combination with the foregoing, is a method of manufacturing a container as defined above, comprising the following steps: a) producing the inner envelope by following the following steps:

- make two films in a material comprising a polymer,

- arrange the films edge to edge,

- make a cutout, in particular in a U-shape, in an area of one of the films forming the upper wall and fix the closing system of the inner casing therein,

- fixing, in particular by making a weld, the films between them at the level of the edges of the films, b) making the outer casing with the opening, c) if necessary make the intermediate envelope, d) open the outer envelope using its opening, e) if the intermediate envelope is present, place the inner envelope in the intermediate envelope and place the intermediate envelope in the outer envelope, or, if there is no intermediate envelope, arrange the inner envelope in the outer envelope.

The two films form the first and second parts of the inner shell, respectively. They can include a polymeric material such as polyethylene.

The two films can be identical so that the fixing, in particular the welding, of the films between them is in the middle of the side wall of the inner envelope. In this case, the distance between the upper edge of the inner shell and the fastener is substantially equal to 50% of the total height of the side wall of the inner shell.

The method may include the step, during the production of the inner envelope, consisting in, after fixing the films together, at least partially covering said fixing, in particular said welding, with a reinforcing strip.

When the container has one or more flaps fixed to the outer casing, respectively to the intermediate casing when present, the method may include the step, during the production of the outer casing, respectively of the intermediate casing, consisting fixing said at least one flap, preferably the flaps, on the upper edge (s) of the outer casing, inside the outer casing, respectively on the upper edge of the side wall (s) of the casing intermediate.

The method may include the step of performing a secondary fastening, in particular a weld, at each side edge of the front and rear side walls of the inner shell, the secondary fasteners preferably being perpendicular to the fastening, in particular the weld. , linking the films together.

Waste conditioning process

Another subject of the invention, according to another aspect, in combination with the above, is a method for packaging waste comprising the following steps: - place a flexible container as defined above, in a metal bucket,

- open the container by opening the outer casing and the inner casing,

- deposit the waste in the interior volume of the container,

- close the container tightly, by closing the inner envelope using the closure system, then, if one or more flaps are present, by fixing the flap (s) to the inner envelope using means fixing, then closing the outer casing.

Brief description of the drawings

The invention may be better understood from reading the detailed description which follows, of non-limiting examples of implementation thereof, and by examining the appended drawing, in which:

[Fig 1] shows schematically, in perspective and seen from the outside, an example of a container according to the invention,

[Fig 2] shows schematically and in perspective, the inner envelope of the container of Figure 1,

[Fig 3] shows schematically and partially, in cross section, a side wall of the envelope of Figure 2,

[Fig 4] shows schematically, in cross section, the container of Figure 1,

[Fig 5] is a view similar to Figure 4 of another example of a container according to the invention,

[Fig 6] shows, schematically, the front wall of an inner envelope of another example of a container according to the invention, and

[Fig 7] shows, in block diagram, different steps of an example of a method of manufacturing a container according to the invention.

detailed description

In the remainder of the description, identical elements or identical functions bear the same reference sign. For the sake of conciseness of the present description, they are not described with reference to each of the figures, only the differences between the embodiments being described. There is illustrated in Figure 1 a flexible container 1 according to the invention, closed. In FIG. 1, only the exterior of this container is displayed 1. The container 1 comprises an outer casing 2. The outer surface of the container 1 is formed by the outer surface 4 of the outer casing 2, visible in this figure.

The outer casing 2, and therefore the container 1, has an elongated shape along a longitudinal axis X, as visible.

In the example illustrated, the outer casing 2 has a parallelepipedal shape, with a lower wall 5 and an upper wall 6, interconnected by four side walls, namely a front side wall 7, a rear side wall 8, two side side walls 9 and 10. The side walls 7 to 10 define the total height H of the outer casing 2 and therefore of the container 1. In this example, the height H is substantially equal to 160 cm. Each side wall 9 or 10 has a length L corresponding to the length of the outer casing 2 and therefore of the container 1. In this example, the length L is substantially equal to 880 cm. Each side wall 7 or 8 has a width l corresponding to the width of the outer casing 2 and therefore of the container 1. In this example, the width l is substantially equal to 250 cm.

The upper wall 6 is occupied over a large part of its surface by an opening 11 defined by three edges, in the shape of a U, namely two longitudinal edges 12 and 13, parallel to the longitudinal axis X and a front edge 14 connecting them. , near the front side wall 7 in this example, perpendicular to the longitudinal axis X. The opening 11 can be opened or closed using a closure system 15 along the longitudinal edges 12 and 13 and front 14. The closure system 15 of the outer casing 2 comprises a zipper in this example. Cords 16 of sufficient length are provided to allow an operator to actuate the closure system 15 from the bottom of the container 1 or to facilitate this actuation.

The outer casing 2 is made of woven polymer material, in particular of PP fabric. The basis weight of the outer shell 2 is, in this example, about 270 g / m ² . The outer casing 2 has mechanical strength.

The container 1 also has an inner envelope 3. Inside the outer casing 2 is arranged the inner casing 3, shown in isolation in Figure 2, closed. The inner envelope 3 delimits an inner volume of the container 1 for receiving and housing the waste. The inner casing 3 has a parallelepipedal shape in this example, with a lower wall 20, an upper wall 21 and four side walls, connecting the lower 20 and upper 21 walls, namely a front side wall 22, a rear side wall 23 , and two side side walls 24 and 25. The upper wall 21 is delimited by upper edges 27, 28, 29 and 30. Likewise, the lower wall 20 is delimited by lower edges 31, 32, 33 and 34. The front side wall 22 is delimited laterally by the side edges 35 and 36. The rear side wall 23 is delimited laterally by the side edges 37 and 38.

The inner shell 3 has, within the upper wall 21, an opening 26 for the introduction of waste. The opening 26 can be opened or closed with the aid of a closure system 19 constituted in this example by a zipper. It is delimited, in a U-shape in this example, by two longitudinal edges 39 and 40 and a rear edge 41, similarly to the outer casing 2, except that the opening 26 is opened towards the before while opening the opening 11 of the outer casing 2 towards the rear, that is to say in the opposite direction, in this example.

According to the invention, the inner casing 3 comprises a first part 45 comprising the upper wall 21 and a first upper portion 46 of the side walls 22, 23, 24 and 25. The inner casing 3 also comprises a second part 47 comprising the lower wall 20 and a second lower portion 48 of the side walls 22, 23, 24 and 25.

The inner casing 3 comprises a fixing 50 extending within the side walls 22, 23, 24 and 25, on at least part of the periphery of the inner casing 3 and making it possible to connect the first part 45 of the inner casing 3 and the second part 47 of inner casing 3 between them, preferably in a sealed manner. In the example illustrated, the binding 50 extends over the entire periphery of the inner casing 3 and is formed by a weld. As visible in Figures 2 and 3, this attachment 50 is formed within the side walls 22 to 25. In the example illustrated, this attachment 50, in particular this weld, extends parallel to the upper edges 27, 28, 29 and 30. Therefore, it also extends parallel to the lower edges 31, 32, 33 and 34.

Furthermore, the binding 50 is located in this example substantially in the middle of the total height of the side walls, that is to say at a distance D from the upper edges 27 to 30 of the upper wall 21 corresponding to 50% of the total height H of the inner casing 3 which corresponds to the total height of the side walls in this example. In the example illustrated, the height ¾ of the inner casing 3 is substantially equal to the height H of the outer casing 2, being approximately equal to 160 cm. Thus, in this example, D is equal to approximately 80 cm.

It should be noted that the fixing 50 is located at a relatively large distance from the closure system 19 of the opening 26, which is advantageous for the mechanical strength of the container 1.

Four other secondary fasteners 55, produced in this example by welds, are present on the inner casing 3. These secondary fasteners 55 are present at the side edges laterally delimiting the front 22 and rear 23 side walls of the inner casing 3. The secondary fasteners 55 are thus merged with the edges 35, 36, 37 and 38.

Apart from the fastening 50 and the secondary fasteners 55, no other fastening of this type, that is to say in this example in the form of a weld, permanent and waterproof, is present in the inner casing 3. In particular, it there is no weld at the upper edges 27, 28, 29 and 30 nor at the lower edges 31, 32, 33 and 34.

Still in the example illustrated, the binding 50 is covered, as can be seen in particular in FIG. 3 but also in FIG. 2, with a reinforcing strip 56 extending over the entire binding 50. A reinforcing strip 57 is also present on the secondary fasteners 55. Portions of reinforcing strips 58 have also been placed at the eight corners of the inner casing 3, in this example. At least one of the reinforcing bands may include a layer of adhesive in contact with the binding 50, the secondary binding 55 and / or the inner shell 3, as well as at least one polymeric material and a fibrous reinforcement.

The inner casing 2 is also provided in this example with a plurality of anchoring points 90 of elastic cables 91 or tensioners visible in FIG. 2. The anchoring points 90 are fixed, at regular intervals, all around the periphery. of the inner surface of the inner casing 3, that is to say on the inner surface of the four side walls 22, 23, 24 and 25. The elastic cables 91 can be fixed in a removable manner, in the open position of the container 1, on fixing points present on a metal skip housing the container 1 when loading waste. There is shown in Figure 4 the container 1 in cross section, perpendicular to the longitudinal axis X. This figure shows the superposition of the outer casing 2 and the inner casing 3, which is arranged inside of the outer casing 2 and connected thereto by double-sided adhesive strips 60 in the example illustrated in this figure. In this example, the double-sided adhesive tapes 60 occupy at least part of the periphery of the outer 2 and inner 3 envelopes and are located in lower, central and upper areas, respectively, of the inner 3 and outer 2 envelopes.

This FIG. 4 also shows the presence, in the container 1, of flaps 65 which are fixed to the upper edges 68, 69, 70 and 71 delimiting the upper wall 6 of the outer casing 2. In FIG. 4, it is visualized only the flaps 65 attached to the top edges 68 and 70 but similar flaps are found attached to the top edges 69 and 71. These flaps 65 constitute a wall portion extending between the outer casing 2 and the inner casing 3, more precisely, as shown in Figure 4, between the upper walls 6 and 21 of the outer casing 2 and the inner casing 3, respectively, so as to cover the closure system 19 of the inner casing 3. Each flap 65 can be fixed, using fixing means 75 constituted in this example by double-sided adhesive strips located on either side of the closure system 19 of the inner casing 3, as can be seen in FIG. 4. This allows, after fulfilled wise of the inner envelope 3 with waste, to close the opening 11 and make it more waterproof thanks to the flaps 65. The double-sided adhesive strips forming the fastening means 75 may be of a width less than the adhesive strips 60.

Another example of a container 1 in accordance with the invention has been shown containing 1 comprising, in addition to the outer 2 and inner 3 envelopes, an intermediate envelope 80 interposed between the inner 3 and outer 2 envelopes as visible. This intermediate envelope 80 comprises in this example a lower wall 81 located interposed between the lower walls 5 and 20 respectively of the outer 2 and inner 3 envelopes. The intermediate envelope 80 also comprises four side walls, two of which, 82 and 83, are visible. in FIG. 5. The intermediate envelope 80 also comprises the flaps 65 forming an upper wall portion and being interposed between the upper walls 6 and 21 respectively of the outer 2 and inner 3 envelopes. The side walls, in particular 82 and 83 but also the other two, not visible, of the intermediate casing 80 are interposed between the side walls of the outer 2 and inner 3 casings, as visible. Double-sided adhesive tapes 60 are also provided to connect, this time, the intermediate casing 80 to the inner casing 3 on the one hand, and the intermediate casing 80 to the outer casing 2 on the other hand. The inner envelope 3 can be made of polyethylene, preferably dust tight. The intermediate casing 80 can be made of a material similar to that of the outer casing 2, thus increasing the mechanical strength of the container 1.

The invention is not limited to the examples which have just been described. For example, the fixing 50 can be placed on the side walls of the inner casing 3 at another location, in particular at a distance D from the upper edges of the inner casing 3 of between 10% and 60% of the height Hi of inner casing 3.

In the example illustrated in FIG. 6 which shows only the front wall 22 of the inner casing 3, the fixing 50 is located at a distance D from the upper edge 30 of less than 50% and greater than 15%, approximately equal to 30% of the total height Hi of the inner casing 3. Thus, in this example, the first part 45 will be lower than the second part 47 of the inner casing 3.

To manufacture the container 1, different steps can be implemented illustrated in FIG. 7. In a first step 90, the inner envelope 3 is produced, for example by following the following steps: two films are produced which will form the first and respectively the first and second steps. second parts 45 and 47 of the inner casing 3, in a material comprising a polymer. A particularly U-shaped cutout is made in an area forming the upper wall of one of the films and which will form the upper wall 21 of the inner casing 3 and the closure system 19 of the inner casing 3 is fixed therein, in particular. by sewing. Then the films are placed edge to edge and the films are fixed, in particular by making a weld, at the level of the edges of the films, so as to achieve the fixing 50.

In a step 91, the outer casing 2 is produced by forming the opening 11 and providing it with a closure system 15.

In a step 92, if the container 1 has one, the intermediate casing 80 is produced, forming the various walls as illustrated for example in FIG. 5. In a step 93, the outer casing 2 is opened using its opening

11.

In a step 94, if the intermediate casing 80 is present, the inner casing 3 is placed in the intermediate casing 80 and then the intermediate casing 80 is placed in the outer casing 2. If there is no no intermediate casing 80, the inner casing 2 is placed in the outer casing 3 and, where appropriate, they are connected together with, for example, double-sided adhesive tapes 60.

The method may include a step consisting in performing a secondary fixing 55 in particular by welding at each side edge of the front and rear side walls 22 and 23 of the inner casing 3.

Other variations can still be considered.

For example, the container 1 may have a cylindrical shape, in which case the inner casing 3 has only one cylindrical side wall, for example, as well as the outer casing 2 and the possible intermediate casing 80. In another example, the binding 50 does not extend over the entire periphery of the inner casing 3 but over only a portion, for example over three of the four side walls.

Claims

1. Flexible container (1) for packaging waste, comprising:

- an outer casing (2) forming the outer surface (4) of the container (1) and having, in its upper part, an opening (11) which can be opened or closed,

- an interior envelope (3) delimiting an interior volume of the container (1) for receiving and housing the waste, and having a lower wall (20), an upper wall (21) and at least one side wall (22, 23, 24 , 25) connecting the lower (20) and upper (21) walls, the inner casing (3) comprising, within the upper wall (21), an opening (26) which can be opened or closed using 'a closure system (19), the inner casing (3) being arranged inside the outer casing (2), characterized in that the inner casing (3) comprises:

- a first part (45) comprising the upper wall (21) and a first upper portion (46) of said at least one side wall (22, 23, 24, 25),

- a second part (47) comprising the lower wall (20) and a second lower portion (48) of said at least one side wall (22, 23, 24, 25), and

- a fastener (50) extending within said at least one side wall (22, 23, 24, 25) on at least part of the periphery of the inner casing (3) and making it possible to connect said first ( 45) and second (47) parts of the inner casing (3).

2. Container (1) according to claim 1, wherein the attachment (50) is present over the entire periphery of the inner shell (3).

3. Container (1) according to claim 1 or 2, wherein the attachment (50) extends substantially parallel to one or more upper edges (27, 28, 29, 30) defining the upper wall (21) and / or to one or more lower edges (31, 32, 33, 34) delimiting the lower wall (20).

4. Container (1) according to any one of claims 1 to 3, wherein the attachment (50) extends in an area located at a distance (D) from at least one upper edge (27, 28, 29 , 30) of the inner envelope (3) between 5% and 90% of the total height (¾) of said at least one side wall (22, 23, 24, 25), better still between 10% and 60%, Again better still between 15% and 55%, or even between 15% and 50% of the total height (Hi) of said at least one side wall (22, 23, 24, 25).

5. Container (1) according to any one of the preceding claims, comprising a reinforcing strip (56) fixed to said at least one side wall (22, 23, 24, 25) of the inner casing (3) and covering at least partially the fixing (50).

6. A container (1) according to any preceding claim, wherein the attachment (50) of the first and second parts (45; 47) of the inner shell (3) is a weld.

7. Container (1) according to any one of the preceding claims, wherein the inner casing (3) has four side walls (22, 23, 24, 25) including a front wall (22) and a rear wall (23). ) and two side walls (24, 25), the four side walls (22, 23, 24, 25) being traversed by the fixing (50), in particular the weld, which preferably extends substantially parallel to the upper edges ( 27, 28, 29, 30) of the upper wall (21), and the front and rear walls (22, 23) being bordered laterally, preferably substantially perpendicular to said attachment, in particular to said weld, of two secondary attachments (55 ), in particular secondary welds, connecting them respectively to the side walls (24, 25), preferably over the entire height (Hi) of the inner casing (3).

8. Container according to any one of the preceding claims, comprising an intermediate casing (80) interposed between the inner casing (3) and the outer casing (2).

9. Container (1) according to any one of the preceding claims, comprising at least one flap (65) interposed between the outer casing (2) and the inner casing (3) and covering the closure system (15) of the inner envelope (3).

10. Container (1) according to the preceding claim, wherein said at least one flap (65) is attached and fixed to the outer casing (2), the outer casing preferably having an upper wall (6) comprising said opening. (26), the upper wall (6) of the outer casing (26) preferably being delimited by one or more upper edges (68, 69, 70, 71), said at least one flap (65) being in particular fixed to the (x) said upper edge (s) (68, 69, 70, 71), in particular by welding or stitching, inside the outer casing (2).

11. Container (1) according to claims 8 and 9, wherein said at least one flap (65) is attached to the intermediate casing (80).

12. Container (1) according to any one of the preceding claims, wherein the outer (2) and inner (3) envelopes and, where appropriate, the intermediate envelope (80), are fixed together, in particular two. in pairs, in particular using double-sided adhesive tapes (60).