EP0547982B1 - Method of manufacturing a spreader body with a metal pouch, spreader body and corresponding spreader - Google Patents

Description

The invention relates to a method of manufacturing a flexible metal bag dispenser body according to the preamble of claim 1 as well as the dispenser body according to the preamble of claim 18 and corresponding dispenser.
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 for manufacturing pocket dispensers, also called two-chamber aerosols, in which the product to be dispensed is placed in a flexible waterproof 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 case, generally metallic, usually 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 completely 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 made of 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-A1-017147 a pocket dispenser is described comprising a rigid casing with a neck which is little or not constricted, a flexible metal pocket with a neck expanded and a metal dome provided with a valve, these three elements being assembled by rolling the edges of the housing and of the pocket then crimping or swaging the dome.

Finally, EP-A-0 326052 describes a method of manufacturing a pocket distributor body consisting in particular of a rigid housing and a flexible and crumpled aluminum pocket, in which a pocket blank is assembled. with cylindrical skirt in a case blank with cylindrical skirt in their upper parts to be conified, then these upper parts thus assembled are conified and rolled simultaneously.

POSITION OF THE PROBLEM

The distributor body described in EP 326052-A2 has a number of advantages over that described in EP-A1-017147:
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-A1-017147;
on the other hand in terms of capacity:
in fact, in EP-A1-017147, 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 dispenser body described in EP-A-0 326052 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 metallic 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 tried to manufacture a range of distributor 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 constriction rate 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 encountered numerous difficulties during the 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 had, at the level of the inside of the neck, a surface too folded to allow the watertight assembly of a valve, despite suitable 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 consisting of a rigid external metal case containing a waterproof, flexible and crumpled metal pocket comprises the manufacture of a rigid case blank and the manufacture of 'a flexible blank of said pocket, the sealed assembly of these two blanks by connecting an upper part of the housing blank, of height H, with an upper part of the blank of the pocket, of height H' , so as to form a space for storing a propulsion means between the bottom of the blank of the case and the bottom of the blank of the pocket, and the common shaping of said upper ends by conification and rolling so forming a constricted neck allowing the tight assembly of a valve, and is characterized in that, so as to form a neck with an interior surface free of folds for a constriction rate R of said pocket at least equal to 1.15 and a secure the sealed fixing of the valve, at least a portion of said upper part of the pocket blank has a wall thickness E greater than the average thickness Eo of the wall of the skirt of said blank of said pocket, the additional thickness relative S defined by the E / Eo ratio 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 dispenser body and more particularly the flexible bag has a significant shrinkage, that is to say when the shrinkage rate R (ratio Di / di between the internal diameter Di of the skirt of the pocket (or of the skirt of the blank), and the internal diameter di of the most constricted part of the wall of the pocket corresponding substantially to the internal diameter of the neck) 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, the value of 1.15, a neck cannot be formed, despite prior adhesive assembly, without having folds on the narrowed wall of the pocket on the inside surface of the neck where the level of shrinkage of the pocket is greatest . These folds make it difficult, if not impossible, to seal a valve tightly.

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

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, a 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 defective distributor bodies so that the sealed assembly of a distribution valve can then be carried out.

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.

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

The invention also relates to a pocket dispenser body consisting of a rigid external metal case containing a flexible and 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 neck 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, at less than 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 the crumpling of the thin flexible pouch 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 gradual 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 / Eo 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 pocket shrinkage, 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.

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).

) préférées : h est voisin de zéro dans le cas de la figure 4a et il est, sur la figure 4b, de l'ordre de 0,3 H, et tel que l'extrémité de la poche soit totalement conifiée mais non roulée de manière à constituer la surface intérieure de l'orifice (5) et à pouvoir être pincée entre la valve et le boîtier.FIGS. 4a and 4b show diagrammatically, in longitudinal half-section relative to the axis of the distributor body, two modalities of the offset h ( $\text{h = H-H '}$

) preferred: 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 conical but not rolled of so as to constitute the internal surface of the orifice (5) and to be able to be pinched between the valve and the housing.

Figure 4c shows schematically, in longitudinal half-section, a modality offset h, typically greater than H / 2, such that the constricted part (22) of the housing (2) is only partially covered internally by the constricted part (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 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 the blank (24) typically between 25 and 50 mm.

However, preferably again, a variable relative 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 produced 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 sealed 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 / 10ths of a mm thick, or by means mechanical, 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 "hot-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 edges rolled (23) of the rigid case and (33) of the flexible pocket when the end of the flexible pocket forms a rolled edge (33).

), cela pour des raisons à la fois d'économie de métal et de facilité de mise en oeuvre.It is preferable 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, with a height h ≧ 0 ( $\text{h = H-H '}$

), this for reasons of both economy of metal and ease of implementation.

Preferably, this offset height h is less than H / 2, that is to say 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) allows to pinch and mechanically fix the pocket (3) flexible at the neck (4) between two relatively rigid concentric surfaces which are the outer edge of the valve and the inner edge of the housing neck (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, 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 FIG. 4c . In this case, the seal between the housing (2) and the pocket (3) is only based 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 dispenser body after filling the bag (3) with the product to be dispensed, and closing 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 184mm 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 housing blank.
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. Before depositing the adhesive, the inside diameter of the upper part of the housing blank is 46.10 mm.
B) Manufacturing of the pocket outline (34):
we first made a blank of the semi-flexible pocket by drawing-stretching from a pawn in aluminum alloy (alloy 1040 according to the designation of the Aluminum Association) with a punch with a diameter shrunk from '' a height of 138 mm counted from its end, so as to obtain a pocket blank having the following dimensions: outside diameter 45.98 mm height 148 mm wall thickness 0.15 x 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 for 5 min at 500 ° C. so as to obtain a flexible pocket blank in the annealed condition and it was internally varnished.
Then a layer of adhesive (maleic modified vinyl acetochloride) of 15 micrometers was deposited on the upper part of the outer surface of the flexible pocket blank, and this, to a height of 25 mm counted from the upper end . This adhesive was dried for 2 min at 80 ° C.
The outside diameter of the upper part of the pocket blank before depositing adhesive 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 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.

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.

ADVANTAGES OF THE INVENTION

The method of the invention is used to obtain pocket distributors comprising, in addition to the distributor body, a valve or a distribution 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 an orifice for introducing propellant, 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 bodies of pocket dispensers 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. Process for producing a dispenser body with a pocket (1) consisting of a rigid external casing of metal (2) containing an impermeable, flexible, crushable pocket of metal (3) involving the production of a rigid casing blank (24) and the production of a flexible pocket blank (34), the impermeable assembly of these two blanks by connection of an upper part (27) of the blank of the casing (24) of height H to an upper part (37) of the blank of the pocket (34) of height H' so as to form a space (7) for the storage of a propelling means between the base (26) of the blank of the casing (24) and the base (36) of the blank of the pocket (34), and the common shaping of said upper ends by (27, 37) conification and rolling so as to form a constricted neck (4) allowing the impermeable connection of a valve (6) and characterised in that, to form a neck (4) having an internal surface which is free from wrinkles for a constriction ratio R of said pocket of at least 1.15 and to allow the impermeable fixing of the valve (6), at least a part of said upper end (37) of the blank of the pocket (34) has a wall thickness E greater than the mean thickness Eo of the wall of the skirt (35) of said blank (34) of said pocket (34) in such a way that the relative excess thickness S defined by the ratio E/Eo is at least 1.15.
2. Process according to Claim 1 in which said relative excess thickness S of metal is at least equal to the value of the constriction ratio R and is a minimum of 1.2.
3. Process according to Claim 2, in which said excess thickness S is preferably between R + 0.3 and R + 1.3.
4. Process according to one of Claims 1 to 3, in which said excess thickness S has the same value substantially over the entire height H' of the upper part (37) of the blank (34).
5. Process according to any one of Claims 1 to 3 in which 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) increasing progressively from Eo to E.
6. Process according to any one of Claims 1 to 5, in which said excess thickness S is located on the internal wall of the skirt (35) of the pocket blank (34).
7. Process according to any one of Claims 1 to 5 in which said excess thickness S is located on the external wall of the skirt (35) of the pocket blank (34).
8. Process according to any one of Claims 1 to 7 in which the impermeable assembly of the casing blank (24) and of the pocket (34) is obtained by a cylindrical annular joint (8) employing chemical means, or a localised annular weld.
9. Process according to Claim 8 in which said chemical means consist of adhesives selected from solutions or dispersions of resins, in an aqueous medium or solvent medium as the case may be, based on EAA, EVA, VMCH (designations of common copolymers), on ionomeric resin Surlyn (R), or based on thermofusible resins known by the name of "hot-melt".
10. Process according to any one of Claims 1 to 9 in which said upper part (37) of the pocket blank (34) is offset toward the interior of the casing blank (24) and relative to said upper part (27) of the casing blank (24) by a height h ≧ O ( $\text{h=H-H'}$

    

    ) within the casing blank (24), typically less than H/2 so that the deformed part of said pocket (3) covers at least the constricted part (22) of said casing (2) and the flexible pocket (3) can thus be gripped and fixed mechanically between the external edge of said valve (6) and the internal edge of the neck (4) of said casing (2) during the fixing of the valve (6).
11. Process according to any one of Claims 1 to 9 in which said offset height h is selected so that the constricted part of the pocket (3) only partially covers the constricted part of the casing (2).
12. Process according to any one of Claims 1 to 11, in which the casing blank (24) is of an aluminium alloy preferably selected from the 1000, 3000, 5000 series according to the standardized designation of the Aluminium Association.
13. Process according to any one of Claims 1 to 12 in which the pocket blank (34) is of aluminium alloy in the annealed state selected from the 1000 series (AA), lightly charged with alloying elements or impurities.
14. Process according to any one of Claims 1 to 13, in which the casing blank (24) has a skirt (25) with a thickness of between 0.30 and 0.50 mm and a diameter between 35 and 66 mm.
15. Process according to any one of Claims 1 to 14, in which the mean 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 skirt part (37) over all or a proportion of its height H' where the maximum thickness E is between 0.25 and 0.45, the thickness E being able to be variable over all or part of the height H'.
16. Process according to any one of Claims 1 to 15, in which the blanks (24) and (25) are partially or completely covered with a protective coating.
17. Process according to Claim 16, in which the blank (24) of said casing (2) has a lacquered and decorated external surface and in which the blank (34) of said pocket is internally coated with a protective layer of lacquer or of plastic film.
18. Dispenser body equipped with a pocket (1) consisting of a rigid external casing of metal (2) containing an impermeable flexible and crushable pocket of metal (3) having a skirt (30), the upper parts of said casing (2) and of said skirt of the pocket (3) being joined together and forming a constriction ending with a neck (4) which is extended by an edge (33) which is rolled to the exterior, the constriction ratio R of said pocket (3) being at least equal to 1.15, this body being obtainable by the process according to any one of Claims 1 to 17, characterised in that said skirt (30) of the pocket (3) has, at less than 10 mm from the beginning of said constriction, a maximum thickness E1 greater than the mean thickness Eo of the skirt (30) in its non-constricted part, E1/Eo being at least equal to 1.15 and the internal surface of said neck (4) being free from wrinkles.
19. Dispenser body according to Claim 18, in which the internal surface of the constriction (32) of the skirt (3) is also free from wrinkles.
20. Dispenser body according to any one of Claims 18 or 19, in which E1/Eo is at least equal to R and is a minimum of 1.2.
21. Dispenser body according to any one of Claims 18 or 19, in which E1/Eo is higher than or equal to R + 0.3.
22. Dispenser body according to any one of Claims 20 or 21, in which said constriction ratio R is higher than 1.35.
23. Dispenser body according to any one of Claims 18 to 22, in which said metal of the pocket (3) is of aluminium or aluminium alloy.
24. Dispenser equipped with a pocket comprising the dispenser body (1) according to any one of Claims 18 to 23 and also a valve (6) or a dispensing pump equipped with a fixing dish which is fixed impermeably inside said neck (4) and on said rolled edge of the body (1).
25. Dispenser according to Claim 24, intended for the dispensing of an aerosol and comprising a dispensing valve, the external casing (2) of its body (1) comprising an orifice (10) for the introduction of the propelling fluid.

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