EP0494132B1 - Dispensing package for pasty products and process for producing the same - Google Patents

Abstract

The container consists of a dispensing head with a nozzle and an outlet closed by a detachable cap, and a tubular body (7) with an inner sleeve (8). The body and sleeve are connected at one end to a collar around the dispensing head, and are closed at the other end. The tubular body is made from a material which returns to its original shape after it has been squeezed, while the inner sleeve is of a more supple material and contains the product to be dispensed. A non-return valve prevents air from escaping from the space between the body and sleeve. The inner sleeve has a double wall and can be made from a single sheet of material folded in half and rolled, with the free edges joined together. <IMAGE>

Description

The invention relates to dispenser packaging for viscous, creamy or paste products, as well as a manufacturing method for such containers. The packaging according to the invention is particularly suitable for the distribution of hygiene products or cosmetics in pasty form.

The cosmetic and sanitary industry has long sought relatively inexpensive packaging capable of delivering its content, without requiring the use of excessive force by the user, and which retains a pleasant external appearance until the end of their existence. .

A well known problem of packaging pasty material, in particular in cosmetics, but also in other technical fields, is to limit as much as possible the contact of the content with the ambient air, which accelerates the degradation of certain components. Containers made of kneadable materials (metal tubes) quickly have an unattractive appearance. Rigid containers easily regain their shape by sucking in air which replaces the paste which has just been extracted therefrom, which constitutes a drawback from the point of view of the degradation of the content and its asepsis. New forms of packaging have been developed to avoid these drawbacks.

US Pat. No. 4,842,165 describes a bottle with an elastic wall in which is hung a pocket intended to contain the product to be dispensed according to the preamble of Claims 1 and 2. This pocket is held at mid-height at the elastic wall. A non-return valve prevents the product from going back into the pocket after compression. A second non-return device placed in the base of the bottle allows air to enter between the bottle and the pocket when compression has ceased.

US-4,909,416 describes a container viscous product dispenser with an external container that can be pressed or deformed locally (accordion structure) and an internal deformable pocket connected to a spout. This spout has a one-way valve preventing backflow of the contents to the pocket. A second valve allows the introduction of air between the pocket and the outer container.

A characteristic common to the containers described in these two documents lies in their relative complexity. These devices use relatively complex valves and inner and outer covers which are manufactured separately and assembled for use. The cost of such containers is therefore relatively high and is only justified for relatively expensive products or for specific uses.

There is a market for distributor packaging for pasty products which, while benefiting from the intrinsic qualities of this type of packaging, could be produced at a relatively low price.

One of the aims of the invention is precisely the production and the placing on the market of a packaging distributor of viscous and pasty products which retains its shape, which is easy to produce and of low cost price.

Another object of the invention is that this packaging, which would only be used once, remains perfectly reliable throughout its use. Another aim is that the consumer can use it to the end without excessive grinding.

The subject of the invention is a dispenser packaging for a pasty or viscous product comprising a dispensing head and a body, said dispensing head comprising a spout traversed by a discharge opening, closable at one end by a removable closure and connected by its other end to a collar;
the body, essentially tubular, develops along an axis and has an inner envelope and a outer envelope surrounding said inner envelope, these two envelopes being closed at one end of the body and being, at the other end, interconnected and at the periphery of the flange of the dispensing head, the internal envelope being more flexible than the outer envelope, devoid of elastic memory and capable of containing a pasty or viscous product;
the outer casing being more elastic and more rigid than the inner casing, nevertheless make it deformable under the effect of a manual compressive force and capable of returning to its original shape when the compressive force ceases to be applied.

A non-return device prevents the passage of air from the volume between the outer envelope and the inner envelope to the outside when the outer envelope is compressed, but allows the passage of ambient air to this volume when the compression ceases to be applied.

The body of this packaging comprises two joined envelopes, these envelopes being joined and merged with the flange of the dispensing head and thus maintained at the level of said flange and at at least two points at the end of the body opposite to said dispensing head.

This packaging is characterized in that said envelopes are formed in one operation, the body being formed of at least two superimposed layers made from at least one sheet of material, folded in two along an axis perpendicular to that of said body. , welded overlapping on their sides extending along the axis of the body, their free end being connected to the periphery of the collar of the dispensing head.

According to another embodiment, this packaging is characterized in that the two envelopes are formed in one operation, the body consisting of at least two superimposed layers formed from at least one sheet of material, wound on themselves around the axis along which said body develops, said body comprising at least one weld substantially parallel to this axis.

Preferably, the end of the tubular body opposite the dispensing head is formed by a weld; in an alternative form, the end of the tubular body opposite the dispensing head is secured to the periphery of the collar of a base.

According to another embodiment, the outer envelope is formed of at least two sub-layers.

Advantageously, the inner envelope and the sub-layers of the outer envelope are identical to each other.

The inner envelope and the sub-layers of the outer envelope can moreover constitute the successive folds of the same sheet of material.

According to another embodiment, a central sub-layer and the inner envelope are made of the same material and preferably constitute two plies of the same sheet of material.

According to an advantageous embodiment, the middle sub-layer and the inner envelope are formed from a single sheet in the form of a sleeve flattened in substance along a plane.

The non-return device preferably comprises at least one orifice in the external envelope, a valve disposed on the internal face of the external envelope opposite said at least one orifice, an area where the external envelope and the internal envelope are not secured surrounding said at least one orifice and said valve.

According to another embodiment, the non-return device comprises at least one orifice formed in the outer envelope, the inner envelope being formed of a sheet whose edges are overlapped welded, the overlap of the edges of this sheet and the position of the weld being such that there remains, outside the internal envelope, a free end, the external envelope and the internal envelope being joined to one another in such a way that the free end is disposed opposite the orifice and forms a valve for said orifice, this arrangement forming a non-return device.

According to another embodiment, the non-return device comprises at least one orifice drilled in the outer casing, at least one orifice drilled in the middle layer, the material covering surface flexible between these two orifices forming a non-return valve, an area in which the outer casing and the middle sub-layer are not secured surrounding said valve.

According to another embodiment, the non-return device comprises at least one orifice drilled along a overlap weld of two sheets, the edge of the covered sheet extending at least as far as this at least one orifice , so as to form a non-return valve for this at least one orifice.

The subject of the invention is also a method of manufacturing dispenser packaging which comprises the following operations:
superposition of at least two layers of materials, made from at least one sheet of material, one of these layers being more rigid and more elastic than the second, the second being, conversely, more flexible and devoid of elastic memory than the first;
arrangement of a non-return device;
transverse folding or winding of these layers superimposed on themselves so as to form substantially tubular bodies;
hermetic junction of the sides of the layers extending along the axis of these bodies;
closing one of the ends of these tubular bodies by hermetically sealing the layers of the external envelope together and by securing the layers of the internal envelope between them;
joining together the sides of the layers forming the open end of the tubular wall;
securing the open end of each of the tubular bodies with the flange of a head, so that the inner casing, the outer casing and the flange form an inseparable whole.

This process preferably includes a surface joining of the two layers, a surface representing at least 50% of the total surface in contact remaining free to move.

Advantageously, this method further comprises the following preliminary operation: folding of a sheet of flexible material so as to produce at least two superposed layers.

The arrangement of a non-return device advantageously comprises the following operations:
drilling at least one orifice in the outer envelope of the tubular body, and
placement of a non-return valve between the outer casing and the inner casing.

According to another embodiment, this insertion of a non-return device comprises the following operations:
drilling at least one orifice in the outer envelope of the tubular body;
drilling at least one second orifice in a middle layer of the tubular body, the second orifices not coming opposite the first, and
provide a covering surface which is not glued between the axis of these first and second orifices, this covering surface forming a non-return valve.

Among the advantages of the invention, one can cite the possibility of applying this type of packaging to relatively inexpensive products which benefit in this way from quality packaging and better conservation.

Another advantage is the low volume of raw materials required for manufacturing.

Another advantage lies in the ease of changing the manufacturing parameters, given the simplicity of the manufacturing process.

Another advantage is the possibility of variations in possible shapes.

Another advantage is that the design of the packaging ensures good maintenance of the inner envelope which empties without the formation of residual pockets.

• la Fig. 1 est une vue schématique éclatée, en perspective, d'un emballage suivant l'invention, à un stade de fabrication intermédiaire;
• la Fig. 2 est une vue de l'emballage de la Fig. 1 à un stade d'achèvement complet;
• la Fig. 3 est une vue en coupe suivant le plan III-III de l'emballage de la Fig. 1;
• la Fig. 4 est une vue schématique éclatée, en perspective, d'une autre forme de réalisation de l'emballage suivant l'invention;
• la Fig. 5 est une vue en coupe suivant le plan V-V d'un détail de la Fig. 4;
• les Fig. 6 à 8 sont des vues schématiques successives montrant l'enroulement progressif de l'empilement de feuilles pour la formation de la gaine;
• la Fig. 9 est une vue en coupe à hauteur de la valve de la Fig. 6;
• les Fig. 10 à 14 sont des vues schématiques en coupe transversale d'autres modes de réalisation de l'emballage suivant l'invention;
• la Fig. 15 est une vue en coupe à hauteur de la valve de la Fig. 12;
• la Fig. 16 est une vue en coupe de feuilles enroulées suivant la Fig. 14;
• la Fig. 17 est une vue en coupe d'un détail de la Fig. 11, et
• la Fig. 18 est une vue en coupe d'un détail de réalisation d'un dispositif antiretour.

Other particularities or advantages of the invention will emerge from the description of a particular embodiment given below, reference being made to the attached drawings, in which:

• Fig. 1 is an exploded schematic view, in perspective, of a packaging according to the invention, at an intermediate manufacturing stage;
• Fig. 2 is a view of the packaging of FIG. 1 at a stage of complete completion;
• Fig. 3 is a sectional view along the plane III-III of the packaging of FIG. 1;
• Fig. 4 is an exploded schematic view, in perspective, of another embodiment of the packaging according to the invention;
• Fig. 5 is a sectional view along the plane VV of a detail of FIG. 4;
• Figs. 6 to 8 are successive schematic views showing the progressive winding of the stack of sheets for the formation of the sheath;
• Fig. 9 is a sectional view at height of the valve of FIG. 6;
• Figs. 10 to 14 are schematic cross-sectional views of other embodiments of the packaging according to the invention;
• Fig. 15 is a sectional view at height of the valve of FIG. 12;
• Fig. 16 is a sectional view of sheets wound according to FIG. 14;
• Fig. 17 is a sectional view of a detail of FIG. 11, and
• Fig. 18 is a sectional view of a detail of embodiment of a non-return device.

Fig. 1 schematically shows two parts of the packaging according to the invention. The head 1 essentially comprises a dispensing spout 2 axially crossed by an orifice 3. One end of the spout 2 is normally closed by a removable closure (not shown). The other end widens to form a collar 4. This collar 4 is provided, over its entire periphery, with a contact surface 5. The packaging also includes a body 6 composed of two envelopes 7, 8 made of materials of different stiffness, the stiffest and most elastic material being arranged towards outside.

These two envelopes 7, 8 are wound on themselves so as to form the tubular body 6 with closed section. A weld 9 made parallel to the axis of this tubular body 6 keeps the envelopes 7, 8 in this configuration.

It goes without saying that the weld 9 could be replaced by a line of adhesive (or any other means known to those skilled in the art) without departing from the scope of the invention.

Fig. 2 shows the same packaging in its completed form. The collar 4 is connected to the tubular body 6 and thus hermetically closes the volume determined by each of the envelopes 7, 8 making up the body 6; we note that at the terminal stage, the flange 4 is completely merged with the two outer 7 and inner 8 casings. The other end of the tubular body 6 is closed by a weld 10 which secures all of the layers together, both layers forming the inner envelope 8 than the layers forming the outer envelope 7.

We see, drilled in the outer casing 7, an orifice 11 which constitutes the outlet of a non-return device 12 the operation of which will be described in FIG. 3. This Fig. 3 shows the packaging 1 in section at the height of the valve 12. The thicknesses of the walls have been deliberately accentuated.

The ends of the envelopes 7, 8 are sealed together, hermetically with respect to one another by the longitudinal weld 9. The internal envelope 8 determines with the flange 4, on the one hand, and with the transverse weld 10, of the other, a volume ("the internal volume") which will be occupied by the pasty product for which the packaging is intended.

Outside the internal envelope 8, between the latter and the external wall 7, extends a second volume ("the external volume") also delimited on either side by the flange 4 and the transverse weld 10. This second volume, initially reduced, when the packaging is full, contains air and communicates with the atmosphere through the opening 11. A valve 13 closes this opening 11 - unidirectionally - so that the air presses on the valve 13 and cannot escape towards the outside when compressed packaging, but can easily enter when this pressure stops.

The operation of this device is simple: when the contours of the external envelope 7 are pressed, the air trapped in the external envelope 7 compresses the internal envelope 8 and causes the expulsion of a determined quantity of product pasty. The internal envelope 8, of low rigidity and practically without elastic memory, substantially retains the shape imposed when the pressure on the external envelope 7 ceases, while the external envelope 7, which is more rigid, quickly returns to its initial form by " "elastic memory. At this time, there is a slight depression in the external volume, which normally causes the suction, through the valve 12, of a volume of air corresponding to the volume of product expelled, the inertia of the internal envelope 8 and of the pasty product itself, as well as a slight restriction of the section of the orifice 3 (not shown) or a unidirectional device preventing the return of a significant quantity of air or product into the internal volume by orifice 3.

In the embodiment shown in FIG. 2, the valve 12 can be replaced, according to the desired performance, by any other non-return device, preferably inexpensive. We can thus limit ourselves to a simple orifice that the user closes when he presses the packaging, or even provide a porous zone in the wall of the external envelope 7, this zone with limited air flow causing a loss of negligible air when pressing on the outer casing 7, but allowing it to gradually resume its shape thanks to its elastic memory.

As the quantity of pasty product is reduced, the pocket formed by the internal envelope 8 is reduced accordingly. However, it is held in place throughout by the longitudinal weld 9 and by gluing zones which do not, however, retain more than half of its surface, so as to allow a gradual withdrawal and as complete an ejection as possible of the pasty product which it contains and avoid obstruction of the spout 2 by the formation of a pocket in the internal wall.

Fig. 4 shows another embodiment of a packaging according to the invention. In it, the body 6 is formed by folding in the direction of the length two sheets forming envelopes 7, 8 of different superimposed rigidities, the sheet forming the most rigid envelope 7 always being turned outwards. The body 6 is sealed along its axis by two junctions 15 securing (by welding or by gluing) the longitudinal edges of these folded sheets. A dispensing spout 2 is fixed, by a flange 4 of suitable shape, to the free edge of the body 6 thus formed.

There are thus two independent volumes, an internal volume communicating with the orifice 3 of the dispensing spout 2, delimited by the sheet forming the internal envelope 8, the two junctions 15 and the flange 4, and, on the other hand, the "external" volume comprised between the internal envelope 8 and the external envelope 7, also delimited by the two junctions 15 and the flange 4. It is noted that here also the two envelopes 7, 8 are merged (or even merged) with the collar 4 at its contact surface 5.

The external volume communicates through the orifice 11 with the atmosphere. A valve 13, located on the internal face of the external envelope 7, acts as a non-return device 12, as can be seen in more detail in FIG. 5.

The method of manufacturing a package according to the invention is quick and inexpensive and its elements are found in the figures described. According to a first form of process, one starts from sheets of materials having two different rigidities 16, 17 (by their nature or by their thickness). For continuous production, these sheets are generally removed mechanically from rolls with continuous unwinding. After superposition, the sheets 16, 17 are wound on themselves and welded to form a tubular sleeve 18. It is also possible to glue the two sheets 16, 17 over at least part of their perimeter. The sections are cut to length and a non-return device 12 is inserted or formed in the body 6. A weld or a sizing at the end allows the insertion of the collar 4, supporting the spout 2, on the body 6. The packaging is finished by pinching the other end 10 of the body or inserting it on a base. Depending on the desired qualities, it is also possible to start from a single sheet 19, of plastic material for example, which, for manufacturing, is first folded back on itself and glued between two plies, so as to form an outer layer. thicker and more rigid composite. This folded sheet 19 is used as a superposition of sheets, wound on itself and welded to form a sleeve as described above. A glued sheet reacts better than an identical sheet with double thickness would react. The adhesive layer 20 in fact also participates, by its intrinsic mechanical properties and by its thickness, in the properties of the envelope.

Figs. 6 and 10 to 13 show different ways of arranging the sheets to produce the body of a package according to the invention.

These different figures show the appearance of the sheets 16, 17 stacked before their shaping to produce the body 6 of the packaging, which allows a better understanding of the particularities of the packaging and of its manufacturing process.

Fig. 6 shows, in perspective, a stack comprising a flexible sheet 16 and a more rigid sheet 17, in this case of substantially rectangular shape. These sheets 16, 17 have two longitudinal sides 21, 22 and two transverse sides 23. A securing means 20 (glue, in this case) is distributed between the sheets 16, 17; this joining is however distributed so as to do not hinder the movements of the leaves over more than 50% of their surface. The non-return device 12, as it appears in section in FIG. 9, here comprises a valve 13 closing the orifice 11 drilled in the most rigid layer 17. To make the body 6 of the packaging according to the invention, the longitudinal sides 21, 22 or the transverse sides 23, 23 are brought together so as to obtain the successive configurations shown in FIGS. 7 and 8, and finally a tubular shape 18. The two edges in contact 21, 22 or 23, 23 are joined to maintain this shape.

Fig. 10 shows another starting point for producing, according to the same process, packaging according to the invention. A single sheet 19, of uneven thickness, is folded in two along a longitudinal axis. Two superimposed layers 24, 25 of different rigidity are obtained. As in the previous example, the winding can be done along a longitudinal axis, parallel to the fold, or along a transverse axis, perpendicular to the latter.

The two layers 24, 25 are partially glued (while retaining their relative freedom over at least 50% of their surface). As in fig. 9, a valve 13 is inserted on the most rigid layer 24, at the level of an orifice 11 so as to produce a non-return device 12.

Various methods make it possible to obtain two different rigidities from the same sheet. As described in Fig. 10, one can use a sheet 19 having, over its width, variable thicknesses, or paste several successive thicknesses of the same sheet. It is also possible, during manufacture, to print a certain bend on a sheet. The part of this curved sheet, intended to form the outer envelope 7, is worked while preserving the direction of its initial curvature. The part intended to form the inner envelope 8, on the contrary, is turned over by folding and shaped by counteracting its initial bending, hence a loss of elasticity which differentiates it from the outer envelope 7.

It is also possible, by a simple mechanical treatment (trituration for example) of part of the width of the original sheet, to obtain different mechanical qualities, favorable to the desired effect in the packaging according to the invention.

Finally, it can be noted that the double fold necessary for the formation of the two envelopes 7, 8 can also be obtained by flattening, roughly along a plane, a section of hose made in the appropriate material or materials. This flattened hose is then folded back on itself, as shown in Figs. 7 and 8 to form a new tubular body 18.

Fig. 11 shows another form of a stack of sheets that can be rolled up to form the body of a package according to the invention. As in the example in Fig. 10, it is a sheet of uneven thickness. The thinner part 27 forms the lower layer. The two free ends 28, 28 of the original sheet, which are thicker, form the upper layer. They are joined by a welded connection which will remain visible after winding since it is part of the outer envelope 7. Such an embodiment shows that the sheets forming the inner 8 and outer 7 envelopes can be interrupted without doing any harm to the good packaging operation. Consequently, it is possible to integrate into the manufacturing process of the packaging according to the invention intermediate operations without departing from the basic concept. Furthermore, with reference to FIG. 17, it can be seen that this manufacturing method allows the easy production of a non-return device 12. During overlap welding, the end 31 of the covered part is allowed to protrude slightly below; this part 31 is applied just like a valve on the orifice 11 formed near the weld. Such a valve can also be provided in a middle layer, of lower elasticity, the orifice of the valve being placed opposite an orifice 11 formed in the outer casing 7; the efficiency of the valve thus formed can be improved by a longitudinal notch, which weakens the section, or by two transverse notches which reduce the length.

Figs. 12 and 13 illustrate the possibility of producing a packaging body from a sheet 32, 33, 34 folded in two folds on itself, so as to obtain three layers 32, 33, 34 of superimposed material. Prior to folding, perforations 11, 35 are produced on two of the folds, arranged so as not to come opposite one another, as seen in FIG. 15. The tongue 36 of flexible material separating these two perforations 11, 35 performs the function of a non-return valve 12, further improved by the bending which occurs during the manufacture of the body 6 of the packaging. The shape and dimensions of the holes 11 and 35 depend on the rigidity of the plastic used. The fold 32 intended to be turned towards the outside and the median fold 33 are secured, by gluing 20 for example (with the exception of the area surrounding the perforations), so as to obtain a "double" wall, more rigid than the "simple" layer of the inner envelope 34 and which therefore functions perfectly according to the principle of the invention. Note that the folding can be done in a Z as in FIG. 12 or in cross folds as in FIG. 13.

You can still combine the material sheets in different ways. In Fig. 14, two sheets 37, 38 of different materials are used: a sheet 37 of more rigid material and a sheet 38 of more flexible material, the latter folded in half. The first envelope is obtained by joining the first sheet 37 and one of the folds of the second sheet 38, by making the non-return device 12 according to the method described above. The second envelope 8 is produced by joining the longitudinal edges of the second sheet 38. The whole is wound as described above (Fig. 7, 8) to form the body 6 of the package.

Fig. 16 shows the section of a coiled body using a structure as described in FIG. 14. As can be seen, it is possible, during the superimposition, to slightly offset the sheets 37, 38 relative to each other, which makes it possible in particular to save material and improve the technical qualities of packaging.

Depending on the technical requirements which the packaging must meet, it may be necessary to superimpose to achieve it an undetermined number of layers, obtained either by successive folding of one or more sheets, or by stacking separate sheets, which are then rolled up on themselves and welded.

Fig. 18 shows another very advantageous way of producing a non-return device. In this embodiment, the outer envelope 7 has an orifice 11. The edges of the sheet forming the inner envelope 8 have a strong overlap and are welded longitudinally by a weld 9, so that a free edge 31 s 'extends in the interval between the inner casing 8 and the outer casing 7 and comes opposite the orifice 11. This free edge 31 assumes the role of a valve vis-à-vis this orifice 11 and forms therewith a non-return device 12. Maintaining the relative positions of the two envelopes 7, 8 is ensured by a bonding 20 disposed near the valve 12.

It will be clear to those skilled in the art that each time reference is made in the present application to an assembly or a joining, this operation can be obtained either by welding, or by spot welding, or by gluing, or by sealing, either by other sealing means suitable for plastic or composite sheets, possibly comprising a metallic or metallized film.

Claims (16)

1. Dispensing packaging for variously pasty or viscous products comprising a dispenser head (1), a body (6), the dispenser head, including a nozzle (2) traversed by a discharge opening (3), being obturable at one extremity by a detachable closure, and being connected by its other extremity to a flange (4),
      the body (6), essentially tubular, extending according to an axis and including an interior envelope (8) and an exterior envelope (7), said exterior envelope (7) surrounding the interior envelope (8), these two envelopes (7, 8) being closed at one extremity of the body (6) and being, at the other extremity, connected to each other and to the periphery (5) of the flange (4) of the dispenser head (1), the interior envelope (8) being more supple than the exterior envelope (7), devoid of elastic memory and suitable for containing a pasty or viscous product,
      the exterior envelope (7) being more elastic and more rigid than the interior envelope (8), but nevertheless deformable under the effect of a manual compression force and capable of resuming substantially its initial form when the compression force ceases to be applied,
      a non-return device (12) for prohibiting the passage toward the exterior of air from the volume comprised between the exterior envelope (7) and the interior envelope (8) when the exterior envelope (7) is compressed, but permitting the passage of ambient air towards this volume when the compression force ceases to be applied,
      the body being comprised of two coupled envelopes (7, 8), said envelopes (7, 8) being united and merged with the flange (4) of the disperser head (1) and thus held in position with respect to the aforesaid flange (4) and on at least two points towards the extremity opposite the aforesaid disperser head (1), characterized in that
      the aforesaid envelopes (7, 8) are made up in one operation, the body (6) being made up of at least two superposed layers (16, 17, 24, 25) formed from at least one sheet of material (16, 17, 19) folded over in two according to an axis perpendicular to that of the aforesaid body (6), lap-welded along their sides (15) extending according to the axis of the body (6), their free extremity being connected to the periphery (5) of the flange (4) of the dispenser head.
2. Dispensing packaging for variously pasty or viscous products comprising a disperser head (1), a body (6), the dispenser head including a nozzle (2) traversed by a discharge opening (3), being obturable at one extremity by a detached closure, and connected by its other extremity to a flange (4),
      the body (6), essentially tubular, extending according to an axis and including an interior envelope (8) and an exterior envelope (7), said exterior envelope (7) surrounding the interior envelope (8), these two envelopes (7, 8) being closed at one extremity of the body (6) and being, at the other extremity, connected to each other and to the' periphery (5) of the flange (4) of the dispenser head (1), the interior envelope (8) being more supple than the exterior envelope (7), devoid of elastic memory and suitable for containing a pasty or viscous product,
      the exterior envelope (7) being more elastic and more rigid than the interior envelope (8), but nevertheless deformable under the effect of a manual compression force and capable of resuming substantially its initial form when the compression force ceases to be applied,
      a non-return device (12) for prohibiting the passage toward the exterior of air from the volume comprised between the exterior envelope (7) and the interior envelope (8), when the exterior envelope (7) is compressed, but permitting the passage of ambient air towards this volume when the compression force ceases to be applied,
      the body (6) being comprised of two coupled envelopes (7, 8), said envelopes (7, 8) being united and merged with the flange (4) of the disperser head (1) and thus held in position with respect to the aforesaid flange (4) and on at least two points towards the extremity opposite the aforesaid disperser head (1), characterized in that
      the aforesaid envelopes (7, 8) are made up in one operation, the body (6) being made up of at least two superposed layers (16, 17, 24, 25) formed from at least one sheet of material (16, 17, 19) rolled up on themselves around the axis according to which the aforesaid body (6) extends, the aforesaid body comprising at least one weld (9) substantially parallel to this axes.
3. Packaging according to claim 2, characterized in that the extremity of the tubular body (6) opposite to the dispenser head is closed by a weld (10).
4. Packaging according to claim 2, characterized in that the extremity of the tubular body (6) opposite to the dispenser head is joined together to the periphery of the flange of a base.
5. Packaging according to any one of claims 1 to 4, characterized in that the exterior envelope (7) is formed of at least two underlayers (32, 33, 37, 38).
6. Packaging according to claim 5, characterized in that a median underlayer and the interior envelope (8) are constituted of one and the same material.
7. Packaging according to claim 6, characterized in that the median underlayer and the interior envelope (8) are formed of one same tubular sheet of material, flattened substantially according to a plane.
8. Packaging according to anyone of the preceding claims, characterized in that the non-return device (12) comprises at least one orifice (11) in the exterior envelope (7), a valving mean (13) placed on the internal face of the exterior envelope, facing this at least one orifice (11), a zone where the exterior envelope (7) and the interior envelope (8) are not joined together surrounding said at least one orifice (11) and said valving means (13).
9. Packaging according to any one of claims 1 to 6, characterized in that the non-return device (12) comprises at least one orifice (11) provided in the exterior envelope (7), the interior envelope being formed of a sheet of which the edges are lap-welded, the overlap of the edges of this sheet and the position of the weld being such that a free extremity (31) subsists towards the exterior of the internal envelope, the external envelope (7) and the internal envelope (8) being joined together one in relation to the other so that the free extremity (31) is facing the orifice (11) and forms valving means for the aforesaid orifice, this disposition forming a non-return device (12).
10. Packaging according to anyone of claims 5 to 7, characterized in that the non-return device (12) comprises at least one orifice (11) pierced in the exterior envelope, and at least one orifice (35) pierced in the median layer, the overlap surface (36) of supple material between these two orifices (11, 35) forming non-return valving means, a zone in which the exterior envelope and the median underlayer are not joined together surrounding the aforesaid valving means.
11. Packaging according to any one of claims 1 to 7, characterized in that the non-return device (2) comprises at least one orifice (11) pierced along a longitudinal lap-welding (9) of two edges, the covered edge (31) of the sheet extending at least up to face this at least one orifice (11), so that it forms non-return valving means for this at least orifice (11).
12. Manufacturing process of a dispensing packaging according to anyone of claims 1 to 7, characterized in that it comprises the following operations:
       superposition of at least two layers of materials (16, 17, 24, 25) formed from at least one sheet of material (16, 17, 19), one of these layers (17) being more rigid and more elastic than the second, the second (16) being, inversely, more supple and devoid of elastic memory than the first;
       fitting of a non-return device (12);
       transversally plying or rolling up these superposed layers on themselves in a manner to form approximately tubular bodies (6);
       hermetically jointing the sides of the layers (21, 22) extending according to the axis of these bodies;
       closing one of the extremities of these tubular bodies by hermetically joining together to each other the layers of the external envelope and by joining together to each other the layers of the internal envelope;
       joining together to each other the sides of the layers forming the open extremity of the tubular wall, and
       joining together the open extremities of each of the tubular bodies with the flange of a head, in a manner such that the internal envelope, the external envelope and the flange form an indissociable whole.
13. Process according to claim 12, characterized in that it further comprises the following operation:
       superficially joining together these two layers (16, 17), a surface representing at least 50% of the total surface in contact remaining free of movement.
14. Process according to claim 12, characterized in that it further comprises the following preliminary operation: folding a sheet of supple material in such a manner to realize at least two superposed layers.
15. Process according to anyone of claims 12, 13, 14, characterized in that the fitting of a non-return device (12) comprises the following operations:
       piercing at least one orifice (11) in the exterior envelope of the tubular body, and
       placing non-return valving means (13) between the exterior envelope (7) and the interior envelope (8), facing this orifice.
16. Process according to any one of claims 12, 13 and 14, characterized in that the fitting of a non-return device (12) comprises the following operations:
       piercing at least one orifice (11) in the exterior envelope (7) of the tubular body;
       piercing at least a second orifice in a median layer (33) of the tubular body (6), the second orifices (35) not facing the first ones, and
       providing an overlap surface not glued (36) between the axis of these first and second orifices, this overlap surface forming non-return valving means.

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