EP0547982A1 - Method of manufacturing a spreader body with a metal pouch, spreader body and corresponding spreader - Google Patents

Abstract

Pocket dispenser body (1) comprising a rigid external metal case (2) containing a waterproof and flexible metal pocket (3) assembled to said case, said case and said pocket, formed respectively from blanks (24) and (34) characterized in that, a) said body (1) is obtained by conification and common rolling of the ends of the two blanks after their assembly, the shrinking rate being at least 1.15; b) the upper end (37) of the blank (34) has a wall thickness E greater than the average thickness Eo of the skirt (35) of the blank (34), the ratio E / Eo being of at least 1.15. <IMAGE>

Description

FIELD OF THE INVENTION

The invention relates to a method of manufacturing a dispenser body with a flexible metal bag as well as the corresponding dispenser and dispenser body.

Such a pocket dispenser is used for cosmetic, pharmaceutical, hygienic or food products.

RECALL OF THE PRIOR ART

Numerous documents are known which describe methods of manufacturing pocket dispensers, also called two-chamber aerosols, in which the product to be dispensed is placed in a flexible sealed pocket provided with a dispensing valve, a pocket which constitutes a barrier between the product to be dispensed and the propellant gas, the bag and the propellant gas being contained in a rigid housing, generally metallic, most often made of aluminum or iron or an alloy of these metals.

In this application, the distributor body is called the distributor before fixing the distribution valve.

Documents are known which describe entirely metallic distributor bodies, as opposed to distributor bodies comprising at least one plastic part (pocket, dome, etc.).

In fact, it may be advantageous for a pocket dispenser body to be metallic, typically aluminum or aluminum alloy, and not plastic despite the ease of shaping of plastic materials, because this material is already recognized for its qualities and widely used in this type of packaging where its behavior with regard to packaged products is well known.

Thus, in EP 017147-A1, a pocket dispenser is described comprising a rigid housing with little or no neck shrinkage, a flexible metal pocket, with expanded neck and a metal dome provided with a valve, these three elements being assembled by rolling the edges of the case and the pocket then crimping or swaging the dome.

Finally, EP 326052-A2 describes a process for manufacturing a pocket dispenser body consisting in particular of a rigid case and a flexible, crumpled aluminum pocket, in which a skirt pocket pocket is assembled. cylindrical in a blank with a cylindrical skirt casing in their upper parts to be conified, then these upper parts thus assembled are conified and rolled simultaneously.

POSITION OF THE PROBLEM

• d'une part, sur le plan esthétique :
• parce que sa partie supérieure conifiée et roulée est en continuité avec son corps cylindrique, la surface lisse obtenue étant préférée à celle du corps avec dôme serti de EP 017147-A1 ;
• d'autre part sur le plan de la capacité :
• en effet, dans l'EP 017147-A1, la poche souple est introduite dans le boîtier rigide après formation de celui- ci. La poche souple présente donc un diamètre extérieur qui doit être inférieur au diamètre de l'orifice du boîtier rigide et, en conséquence, la capacité de la poche souple, c'est-à-dire la quantité de produit à délivrer, est limitée, beaucoup d'espace annulaire étant inutilisé entre la jupe du boîtier et celle de la poche. Ce n'est pas le cas avec le corps de distributeur décrit dans l'EP 326052-A2 pour lequel il y a un faible volume mort entre la jupe du boîtier rigide et celle de la poche souple.

The distributor body described in EP 326052-A2 has a number of advantages over that described in EP 017147-A1:

• on the one hand, on the aesthetic level:
• because its conical and rolled upper part is in continuity with its cylindrical body, the smooth surface obtained being preferred to that of the body with dome set with EP 017147-A1;
• on the other hand in terms of capacity:
• in fact, in EP 017147-A1, the flexible pouch is introduced into the rigid case after it has been formed. The flexible bag therefore has an outside diameter which must be less than the diameter of the orifice of the rigid case and, consequently, the capacity of the flexible bag, that is to say the quantity of product to be delivered, is limited, a lot of annular space being unused between the skirt of the case and that of the pocket. This is not the case with the distributor body described in EP 326052-A2 for which there is a small dead volume between the skirt of the rigid case and that of the flexible pocket.

The Applicant has therefore tried to manufacture dispenser bodies with a metal pocket with a conical and rolled housing which meet these aesthetic and capacity requirements by testing the process described in EP 326052.

More specifically, the applicant has attempted to manufacture a range of dispenser bodies varying in particular by diameter.

However, as in general the valves to be fixed on the housing body to form the housing itself (after filling the bag with product to be distributed) are of single and standard diameter (1 inch, or 25.4 mm), the Housing bodies manufactured in these tests therefore varied by the degree of conification or rate of constriction R of the conified walls. This shrinking rate R can be expressed by the ratio Di / di, Di corresponding to the inside diameter of the cylindrical skirt (not shrunk) and di corresponding to the inside diameter of the most constricted conical part, located at the neck where will be fixed the distribution valve.

However, the Applicant has encountered numerous difficulties during conformation tests, using the conification and rolling tools usually used by those skilled in the art. In particular, she observed that from a certain level of constriction or conification, the most constricted part of the pocket crumpled up and presented, at the inside of the neck, a surface too folded to allow the tight assembly of a valve, despite adapted adjustments of the tools.

The present invention makes it possible to solve this problem and therefore to obtain a distributor body with a high shrinkage level, with a neck free of folds, therefore suitable for the sealed assembly of a valve.

DESCRIPTION OF THE INVENTION

According to the invention, the method of manufacturing a pocket dispenser body (1) consisting of a rigid external metal case (2) containing a sealed, flexible and crumpled metal pocket (3) comprises the manufacture of a rigid housing blank (24) and the manufacture of a flexible blank of said pocket (34), the sealed assembly of these two blanks by connection of an upper part (27) of the housing blank, of height H, with an upper part (37) of the blank of the pocket, of height H ', so as to form a storage space (7) of a propelling means between the bottom (26) of the blank of the housing and the bottom (36) of the blank of the pocket, and the common shaping of said upper ends by conification and rolling so as to form a constricted neck (4) allowing the tight assembly of a valve (6) , and is characterized in that, so as to form a collar (4) with an interior surface free of folds for a rate of shrinking R of said pocket at least equal to 1.15 and ensuring the tight fixing of the valve (6), at least a portion of said upper part (37) of the blank of the pocket has a thickness E of upper wall at the average thickness Eo of the wall of the skirt (35) of said blank (34) of said pocket, the relative excess thickness S defined by the ratio E / Eo being at least equal to 1.15.

By convention, the "upper parts" of the two blanks extend to the open upper ends of these blanks.

The invention applies in particular in the case where the distributor body and more particularly the flexible pouch (2) has a significant shrinkage, that is to say when the shrinkage rate R (ratio Di / di between the inside diameter Di of the skirt (30) of the pocket (3) (or of the skirt (35) of the blank (34)), and that di of the most constricted part of the wall (32) of the pocket (3) corresponding substantially to the inside diameter of the neck (4) is high, greater than 1.2 and typically greater than 1.35.

Indeed, the problem to be solved by the invention does not arise at all or little when the shrinking rate R is equal to 1 or slightly greater than 1. On the other hand, as soon as this rate reaches, and a fortiori exceeds, value of 1.15, a neck (4) cannot be formed, despite prior adhesive assembly, without having folds on the constricted wall (32) of the pocket on the inside surface of the neck (4) where the level pocket shrinkage is the largest. These folds make it difficult, if not impossible, to seal a valve (6) tightly.

Taking into account that, according to the invention, the walls (skirt and upper part) of the housing (2) and of the pocket (3) are close and substantially homothetic, in particular in the conical part where they are assembled, the ratio Di / di expressing the shrinkage level R of the pocket (3) also substantially expresses that of the housing (2).

It is known that folds can also form when a cylindrical skirt of a rigid wall blank is conified and then the edge is rolled up to obtain a distributor body. In this case, the person skilled in the art knows that by carrying out an additional operation called counterbore, that is to say by machining the surface of the neck in order to remove the folds of metal, it is possible to recover the bodies. of defective distributor so as to then be able to carry out the sealed assembly of a distribution valve.

In the case of a dispenser with a flexible, crumpled pocket, typically 0.1 to 0.2 mm thick, it is not possible to lamate the neck because the corrugations of metal, of a few 1/10 th of a mm of amplitude, may have an amplitude at least equal to the thickness of the metal of the flexible pocket of small thickness relative to that of the rigid case, so that a countersink inevitably leads to piercing the flexible pocket (3).

It was therefore imperative to obtain a wrinkle-free collar.

DESCRIPTION OF THE FIGURES

• Figure 1 shows schematically, in longitudinal section, the two blanks of the housing (24) and the pocket (34) made mechanically integral by a sealed annular junction (8), before the conformation and rolling phase.
• Figure 2 shows schematically, in longitudinal section, the manufacture of a blank (34) of the pocket whose skirt (35) has an average thickness Eo and whose end (37) has, over a height H 'a greater thickness at Eo and over most of the height H 'a thickness equal to E.
• Figure 3 shows schematically, in longitudinal section a blank (34) of the pocket whose end (37) has an extra thickness located on the outer wall, while in Figure 2, the extra thickness was located on the inner wall of the draft (34).
• FIGS. 4a and 4b show diagrammatically, in longitudinal half-section relative to the axis of the distributor body, two methods of the offset h (h = H-H ') preferred according to the invention: h is close to zero in the case of FIG. 4a and it is, in FIG. 4b, of the order of 0.3 H, and such that the end of the pocket is completely conified but not rolled so as to constitute the interior surface of the orifice ( 5) and able to be pinched between the valve and the housing.
• FIG. 4c shows diagrammatically, in longitudinal half-section, a method according to the invention of the offset h, typically greater than H / 2, such that the constricted part (22) of the housing (2) is only partially covered internally by the part constriction (32) of the pocket (3).
• Figure 5 shows schematically, in longitudinal section, a bag dispenser body according to the invention.
• Figures 6a to 6c show, in longitudinal section, respectively, the blanks of the housing and the assembled bag, the same blanks after conformation, and after rolling of the edge or chimney.

PREFERENTIAL MODALITIES OF THE INVENTION

The Applicant has observed that said relative excess thickness S necessary for not obtaining folds varied with the shrinkage rate R of the flexible bag (3) (R = Di / di) greater than or equal to 1.15 and that the value of S should be at least equal to the value of R and preferably between R + 0.3 and R + 1.3.

The relative excess thickness S is preferably at least equal to 1.2 and has substantially the same value over the entire height H 'of the upper part (37) of the blank (34) and therefore over the entire constricted wall ( 32) and possibly rolled (33) of the pocket (3), this height H 'being typically between 5 and 50 mm and preferably between 15 and 40 mm, for a height H of the upper part (27) of l blank (24) typically between 25 and 50 mm.

But more preferably, a variable additional thickness S is chosen, at least over a fraction of said height H ', making it possible to progressively go from the average thickness of the skirt (35) Eo to the maximum thickness E, because it has been found that the extra thickness S is all the more necessary as the metal is more shrunk by conification, in the same conified body.

A variable relative excess thickness S moreover avoids unnecessary consumption of metal and above all facilitates the extraction of the blank (34) from the mandrel when the latter is manufactured by stretching or calibration as shown diagrammatically in FIG. 2.

This relative excess thickness S can be located on the interior wall of the skirt (35) when it is obtained with a punch of variable section as shown diagrammatically in FIG. 2.

It can also be located on the outer wall, as shown schematically in Figure 3.

The tight assembly of the blanks is carried out by a cylindrical annular junction (8) which is obtained either by chemical means, typically a thin adhesive layer, at most of a few 1/1 mm of thickness, or by mechanical means, such as forcibly fitting the blank (34) into the blank (24), which is possible with calibrated blanks (24) and (34) and in particular in the case where the extra thickness S of the blank (34) is of variable thickness and located on its outer wall, or again by localized annular welding of the two upper parts (27) and (37).

When an adhesive layer is used, the adhesive can be chosen from solutions or dispersions of resins, as the case may be in an aqueous medium or in a solvent medium, based on EAA, EVA, VMCH (common copolymer designations), Surlyn (R) ionomer resin, or based on hot-melt resins, known as "man-melt". Preferably, a maleic modified vinyl acetochloride copolymer is used.

Generally, the clearance between the blank (24) and the blank (34) after tight assembly is low. The clearance between the upper part (27) of the blank of the housing and the upper part (37) of the blank of the pocket is typically between 0.05 and 0.5 mm.

The Applicant has observed that by assembling the two blanks by a cylindrical annular junction (8), of height possibly less than the height H 'of the upper part (37) of the pocket subjected to deformation, the metal walls of the two assembled blanks behaved in the conformation and rolling tool substantially like a single metal wall.

This cylindrical junction (8) becomes, after deformation by conification and rolling, the shaped annular junction (9), which secures all or part of the constricted walls (22) and (32) and possibly of the rolled edges (23) of the rigid housing and (33) of the flexible pocket when the end of the flexible pocket forms a rolled edge (33).

It is preferable, according to the invention, to offset the end of the upper part (37) of the blank (34) of the pocket, towards the inside of the blank of the housing and relative to the end of the upper part (27) of the blank (24) of the housing, from a height h to 0 (h = H-H '), this for reasons of both economy of metal and ease of installation artwork.

Preferably, this offset height h is less than H / 2, ie substantially 25 mm, so that, as illustrated in FIGS. 4a and 4b, the deformed part of the pocket (3) covers at least the constricted part (22) of the housing so that the assembly of the valve (6) makes it possible to pinch and fix mechanically the flexible pocket (3) at the neck (4) between two relatively rigid concentric surfaces which are the outer edge of the valve and the inner edge of the neck of the housing (2).

The constricted portion (22) of the housing or (32) of the pocket is defined as the portion of the housing or pocket that is only subjected to a reduction in diameter or that is shrunk during conification (portion located between dotted lines in FIG. 4a or 4b), as opposed to the rolled part (23) of the housing or (33) of the pocket, when it exists, which has been then subjected to expansion (slight increase in diameter after conification).

But it is possible according to the invention, although this is not the preferred mode of the invention, to choose an offset height h such that the constricted part of the pocket only partially covers the constricted part of the housing, as illustrated in Figure 4c.

In this case, the seal between the housing (2) and the pocket (3) only rests on the seal and the mechanical strength of the annular junction (9) between the walls (22) and (32) constricted respectively. case and pocket.

The blanks of the housing (24) and of the pocket (34) are preferably made of aluminum or aluminum alloy. The blank of the housing (24) intended to form the rigid housing (2) is preferably made of aluminum alloy chosen from the 1000, 3000 and 5000 series according to the standardized designation of the AA (Aluminum Association) while the blank of the pocket (34) intended to form the flexible pocket (3) is preferably made of aluminum alloy chosen from the 1000 series, lightly loaded with additives or impurities.

As regards its metallurgical state, the blank of the pocket (34) is in the annealed state so that the pocket (3) has sufficient flexibility.

The thickness of the skirt (25) of the blank of the housing is generally between 0.30 and 0.50 mm depending in particular on the pressure resistance which is required for the housing (2). Its diameter is between 35 and 66 mm in the case of the usual diameters of the distributor bodies (1).

The thickness Eo of the skirt (35) of the blank of the pocket is generally between 0.1 and 0.2 mm and preferably between 0.12 and 0.18 mm, except at the upper end of the skirt, over all or part of its height H ', where the maximum thickness E is generally between 0.25 and 0.45 mm, this thickness being variable as already mentioned over all or part of the height H'.

The blanks of the housing (24) and of the pocket (34) can be completely or partially covered with a protective coating, whether it is a varnish or a film resistant to deformation by conification and by rolling. . Preferably, the blank (24) of the housing has its painted and decorated external surface and its internal surface coated or not with a protective layer (varnish or plastic film), and the blank (34) of the pocket has its surface. internal coated with a protective layer (varnish or plastic film) compatible with the product to be packaged while its external surface can be bare or coated.

During the formation of a pocket distributor body by conification and rolling of assembled blanks, the bottom (21) of the housing is shaped, the bottom which has been provided with a central orifice (10) making it possible to introduce into the storage space (7) the propellant, typically a propellant, which may be partially in the liquid state.

The assembly, by crimping or swaging, of a valve (6) to the distributor body after filling of the bag (3) with the product to be dispensed, and the closing of the orifice (10) after introduction of the propellant in the storage space (7) complete the manufacture of a pocket dispenser loaded with product to be dispensed.

EXAMPLE

• A) Manufacture of a rough outer case blank:
  • a rigid housing blank (24) was manufactured by drawing-drawing from an aluminum alloy pin (alloy 1040 according to the designation of Aluminum Association):
  • outside diameter 47 mm
  • height: 184 mm
  • wall thickness: 0.30 mm at the bottom of the skirt - 0.35 mm at the top of the skirt

After degreasing, a decoration was printed on the external surface of this blank of the housing.

A layer of adhesive (maleic modified vinyl acetochloride) of 15 micrometers was deposited on the upper part of the interior surface of the housing, and this, over a height of 25 mm counted from the upper end. This adhesive was dried for 2 min at 80 ° C.

• B) Fabrication de l'ébauche de la poche (34) :
  • on a d'abord fabriqué une ébauche de la poche semi-souple par filage-étirage à partir d'un pion en alliage

Before depositing the adhesive, the inside diameter of the upper part of the housing blank is 46.10 mm.

• B) Manufacturing of the pocket blank (34):
  • we first made a blank of the semi-flexible pocket by drawing-stretching from an alloy pin

• diamètre extérieur : 45,98 mm
• hauteur : 148 mm
• épaisseur de paroi : 0,15 sur 138 mm (partie basse de la jupe)
• (en mm) : 0,35 sur 25 mm (partie haute de lajupe) 0,15-0,35 sur 10 mm de transition entre partie haute et partie basse

of aluminum (alloy 1040 according to the designation of the Aluminum Association) with a punch with a narrowed diameter from a height of 138 mm counted from its end, so as to obtain a pocket blank having the following dimensions:

• outer diameter: 45.98 mm
• height: 148 mm
• wall thickness: 0.15 by 138 mm (lower part of the skirt)
• (in mm): 0.35 on 25 mm (upper part of the skirt) 0.15-0.35 on 10 mm of transition between upper part and lower part

This semi-flexible pocket blank was then treated 5 mm at 500 ° C. so as to obtain a flexible pocket blank in the annealed condition and it was varnished internally.

Then a layer of adhesive (maleic modified vinyl acetochloride) of 15 micrometers was deposited on the upper part of the external surface of the flexible pocket blank, and this, over a height of 25 mm counted from the upper end . This adhesive was dried for 2 min at 80 ° C.

• on a introduit l'ébauche de la poche (34) dans celle du boîtier (24) bord à bord (ici h + 0) et on a étuvé l'ensemble à 160°C pendant 2 minutes.

The outside diameter of the upper part of the pocket blank before adhesive deposition is 45.98 mm. C) Assembly of the blanks of the case and the pocket:

• the blank of the pocket (34) was introduced into that of the case (24) edge to edge (here h + 0) and the whole was baked at 160 ° C for 2 minutes.

D) Conification and rolling:

this assembly was conified in several successive passes like a single wall aerosol so as to reduce the internal diameter to 25.4 mm (1 "). The formed chimney was then rolled after a slight trimming of the formed chimney and the body of dispenser thus obtained was steamed at 160 ° C. for 2 minutes The interior surface of the constricted portion and of the chimney or neck was surprisingly free of folds and smooth at the end of conification.

Figures 6a to 6c show different stages of the manufacture of the dispenser body according to the example. The blanks of the housing and of the pocket are shown assembled in FIG. 6a, after conformation in FIG. 6b and after rolling in FIG. 6c, which shows in section the distributor body obtained according to the example described above.

• H = H' = 35 mm
• Eo = 0,15 mm, E = 0,35 mm S = E/EO = 2,33
• Di = 45,98 - 0,7 = 45,28 mm, di = 25,4 mm Di/di = 1,78

Jeu entre partie hautes (27) et (37) = 0,12 mm.With the notations used in the description, we have, in this example, the following values or relations:

• H = H '= 35 mm
• Eo = 0.15 mm, E = 0.35 mm S = E / EO = 2.33
• Di = 45.98 - 0.7 = 45.28 mm, di = 25.4 mm Di / di = 1.78

Clearance between upper parts (27) and (37) = 0.12 mm.

The invention also relates to a pocket dispenser body consisting of a rigid external metal case containing a flexible, crumpled waterproof metal pocket having a skirt, the upper parts of said case and of said pocket skirt being linked together. and forming a constriction ending in a collar extending by an externally rolled edge, the constriction ratio R of said pocket being at least equal to 1.15, this body being obtainable by the preceding method, characterized in that said skirt the pocket has, within 10 mm from the start of said constriction, a maximum thickness E1 greater than the average thickness Eo of the skirt in its non-constricted part, E1 / Eo being at least equal to 1.15 and the external surface of said collar free of creases.

The constricted portion is deformed circumferentially and axially, and the result is typically a thickening which increases towards small diameters.

The invention avoids crumpling creases in the thin flexible pocket when the shrinkage rate R is high, the most important practical result being the absence of folds on the inside surface of the neck. To this absence of folds is added, to recognize a dispenser body of the invention, the presence of a thickening of the pocket before the shrinking or at the beginning of the shrinking, that is to say in an unaffected area or little affected by the progressive thickening effect linked to shrinking.

Typically, the interior surface of the skirt shrinkage is also free of creases, as well as the exterior surface of the rolled edge.

The maximum thickness E1 of the pocket more or less 10 mm from the neck is preferably such that E1 / Eo is greater than R and at least equal to 1.2. This maximum thickness E1 increases even more with the preferential condition E1 / Eo greater than or equal to R + 0.3, corresponding to the condition "E / E greater than or equal to R + 0.3" adopted preferably for the pocket blank.

The effect of the invention, absence of internal folds of the neck, and typically of the shrinking of the pocket, is even more remarkable when R is greater than 1.35. The significant excess thickness in the vicinity of the start of the shrinking of the pocket is then most often a characteristic complementary sign.

In particular, the pocket is made of aluminum or aluminum alloy and typically has a thickness of 0.1 to 0.2 mm.

ADVANTAGES OF THE INVENTION

The method of the invention is used to obtain pocket distributors comprising, in addition to the distributor body, a distribution valve or pump fixed in a sealed manner thanks to the invention, by a cup for fixing this valve or pump, to or against the inside of the neck and on the rolled edge of the body whose pocket has just been filled with the dispensed product. In the case of an aerosol dispenser, the bottom of the housing has a propellant introduction orifice, closed by a plug after this introduction.

The invention provides a solution to the problem of sealing the valve in the case of bag dispenser bodies, the conical part of which has a high shrinkage rate.

Thus, the invention makes it possible to widen the range of dispenser bodies with a pocket towards large diameters (high shrinkage rate), and provides greater security with regard to the tight fixing of the valve, compared to the prior art, even in the case of dispenser bodies with a low shrinkage rate, typically close to or less than 1.15.

Claims (25)

1. A method of manufacturing a pocket dispenser body (1) consisting of a rigid external metal case (2) containing a sealed, flexible and crumpled metal pocket (3) comprising the manufacture of a rigid blank of housing (24) and the manufacture of a flexible pocket blank (34), the sealed assembly of these two blanks by connection of an upper part (27) of the housing blank, of height H, with a part upper (37) of the blank of the pocket, of height H ', so as to form a storage space (7) of a propulsion means between the bottom (26) of the blank of the housing and the bottom ( 36) of the blank of the pocket, and the common shaping of said upper ends by conification and rolling so as to form a constricted neck (4) allowing the tight assembly of a valve (6), and characterized in that that, so as to form a collar (4) with an interior surface free of folds for a shrinkage rate R of said poc he at least equal to 1.15 and ensure the tight fixing of the valve (6), at least a part of said upper end (37) of the blank of the pocket has a wall thickness E greater than the average thickness Eo of the wall of the skirt (35) of said blank (34) of said pocket, so that the relative excess thickness S, defined by the ratio E / Eo, is at least equal to 1.15. 2. Method according to claim 1 wherein said relative excess thickness S of metal is at least equal to the value of the shrinkage ratio R, and is at least 1.2. 3. Method according to claim 2, wherein said additional thickness S is preferably between R + 0.3 and R + 1.3. 4. Method according to any one of claims 1 to 3 wherein said excess thickness S has the same value substantially over the entire height H 'of the upper part (37) of the blank (34). 5. Method according to any one of claims 1 to 3 wherein said excess thickness S is variable, at least over a fraction of the height H 'of the upper part (37) of the blank (34) subjected to deformation, the thickness of the blank (34) gradually increasing there from Eo to E. 6. Method according to any one of claims 1 to 5 wherein said excess thickness S is located on the inner wall of the skirt (35) of the pocket blank. 7. Method according to any one of claims 1 to 5 wherein said additional thickness S is located on the outer wall of the skirt (35) of the pocket blank. 8. Method according to any one of claims 1 to 7, wherein the sealed assembly of the housing blank and the pocket blank is obtained by a cylindrical annular junction (8) using mechanical means, or a localized annular welding. 9. The method of claim 8 wherein said chemical means consist of adhesives chosen from solutions or dispersions of resins, as the case may be in aqueous medium or in solvent medium, based on EAA, EVA, VMCH (designation of copolymers common), of Surlyn (R) ionomer resin, or based on hot-melt resins, known as "hot-melt". 10. Method according to any one of claims 1 to 9, wherein said upper part (37) of the pocket blank is offset, towards the inside of the housing blank and relative to said upper part (27) of the blank of the housing, from a height h to 0 (h = H-H ') inside the blank of the housing, typically less than H / 2 so that the deformed part of said pocket covers at least the constricted part (22) of said housing and so that the flexible pocket (3) can be pinched and mechanically fixed between the outer edge of said valve and the inner edge of the neck of said housing, when the valve is fixed. 11. Method according to any one of claims 1 to 9 wherein said offset height h is chosen so that the constricted part of the pocket only partially covers the constricted part of the housing. 12. Method according to any one of claims 1 to 11, in which the housing blank (24) is made of aluminum alloy preferably chosen from the 1000,3000,5000 series according to the standardized designation of the AA (Aluminum Association ). 13. Method according to any one of claims 1 to 12 wherein the pocket blank (34) is made of aluminum alloy in the annealed state selected from the 1000 series (AA), lightly loaded with additives or impurities . 14. Method according to any one of claims 1 to 13, wherein the housing blank (24) has a skirt (25) of thickness between 0.30 and 0.50 mm and diameter between 35 and 66 mm . 15. Method according to any one of claims 1 to 14, wherein the average thickness Eo of the skirt (35) of the pocket blank (34) is between 0.1 and 0.2 mm and preferably between 0 , 12 and 0.18 mm, except in the upper part (37) of the skirt over all or part of its height H ', where the maximum thickness E is between 0.25 and 0.45, the thickness E possibly be variable over all or part of the height H '. 16. Method according to any one of claims 1 to 15, in which the blanks (24) and (25) are partially or totally covered with a protective coating. 17. The method of claim 16, wherein the blank (24) of said housing has a lacquered and decorated external surface and wherein the blank (34) of said pocket is coated internally with a protective layer of varnish or film. plastic. 18. Distributor body with pocket (1) consisting of a rigid external metal case (2) containing a flexible waterproof pocket and chiffonnalbe of metal having a skirt (30), the upper parts of said case (2) and said skirt of the pocket (3) being linked together and forming a constriction ending in a neck (4) extending by an externally rolled edge (33), the constriction rate R of said pouch (3) being at least equal to 1, 15, this body being obtainable by the method of any one of claims 1 to 17, characterized in that said skirt (30) of the pocket (3) has, within 10 mm from the start of said constriction, a maximum thickness E1 greater than the average thickness Eo of the skirt (30) in its non-constricted part, E1 / Eo being at least equal to 1.15 and the interior surface of said neck (4) being free of folds. 19. Dispenser body according to claim 18, in which the inner surface of the neck (32) of the skirt (3) is also free of folds. 20. Dispenser body according to any one of claims 18 or 19, in which E1 / Eo is at least equal to R and is at least 1.2. 21. Distributor body according to any one of claims 18 or 19, in which E1 / Eo is greater than or equal to R + 0.3. 22. Dispenser body according to any one of claims 20 or 21, in which said shrinkage rate R is greater than 1.35. 23. Dispenser body according to any one of claims 18 to 22, wherein said metal of the pocket (3) is aluminum or aluminum alloy. 24. Pocket dispenser comprising the dispenser body (1) of any one of claims 18 to 23 and further a valve or a dispensing pump equipped with a fixing cup which is tightly fixed inside said neck (4) and on said rolled edge of the body (1). 25. The dispenser according to claim 24, intended for dispensing an aerosol and comprising a dispensing valve, the outer casing (2) of its body (1) comprising an orifice for introducing the propellant fluid.

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