FR2634466A1 - Method of making and packaging a dispenser with a pouch, and corresponding subassemblies and dispensers - Google Patents

Abstract

The invention relates to a method of making and packaging a dispenser with a pouch comprising a casing surmounted by a dome 2, a leak-tight flexible pouch 4 fixed in this casing and dispensing means connected in a leak-tight manner to the said dome 2 and to the said pouch 4, characterised in that, before any other operation of assembly and packaging, a dome 2 is made of plastic material by moulding, this dome comprising an internal tubing 5 moulded on the upper end of a skirt 4 forming a blank for the pouch, thus obtaining a pre-assembled part (dome + skirt) 1, the dome 2 furthermore comprising portions 6, 7 for fixing to the upper end of the casing and to the dispensing means respectively. The invention also relates to the subassemblies and the dispensers with pouches obtained. The invention applies in the pharmaceutical, cosmetic, hygiene and food fields.

Description

MANUFACTURING AND PACKAGING PROCESS
OF A POCKET DISTRIBUTOR, SUB-ASSEMBLIES
AND CORRESPONDING DISTRIBUTORS
The invention relates to a pocket dispenser and its manufacturing and packaging method. Such a pocket dispenser is used for cosmetic, pharmaceutical, hygienic or food products.

The document FR-A-2 310 827, corresponding to patent US-A-4,045,860, describes an aerosol container with two chambers or "with pocket" in which, so as to obtain a perfect seal at the level of the fixing of the pocket on the external container or shoemaker, an annular seal is put in place between the rolled edge of the dome of the shoemaker and the collar of the pocket, this collar being released from the bootmaker by an extractor then this extractor being itself released Then place the fixing cup of the dispensing valve on the upper edge of the housing and crimp the peripheral flange of this cup around the rolled edge, the annular seal being thus tightened between this rolled edge and the pocket cup on the one hand and the flange of the valve fixing cup on the other hand. The assembly operations ending with this crimping are thus delicate and relatively complex.

The Applicant has sought to develop a manufacturing process in which the assembly operations are simplified, particularly those which follow the manufacture of the bootmaker.

EXPOSURE OF THE PROBLEM
The subject of the invention is a manufacturing and packaging process comprising a shoemaker surmounted by a dome, a waterproof soup pocket attached to the inside of this housing and dispensing means connected in leaktight manner to said dome and to said pocket. According to the invention, before any other assembly and packaging operation, a plastic dome is produced by molding comprising an inner tube molded on the upper end of a skirt forming the blank of the pocket, thus obtaining a preassembled part (dome + skirt), the dome further comprising fixing portions respectively on the upper end of the shoemaker and to the distribution means.

The rough skirt of. pocket is thus fixed in a sealed manner to a dome which will connect the case to the distribution means, instead of being fixed to the case as in the prior art.

The pre-assembled part (dome + skirt) has significant advantages:
- the shaping and assembly operations are facilitated;
- the problem of sealing between pocket and upper edge of the shoemaker
is simplified;
- the piece (dome + skirt) can be fixed tightly, either first
at the upper end of the shoemaker, or first by means of
distribution, which allows filling of the bag by the
top or bottom;
- the manufacturing process can be adapted to types of distribution
various teurs ::
. having a metal housing, with a distribution valve,
and a propellant between pocket and case;
or having a metal casing or a plastic casing
or metallo-plastic, with a return distribution pump
little or no air, the bag then being subjected to pressure
atmospheric;
- as we will see, the methods of fixing the part (dome
+ skirt) are varied and industrially simple and reliable, their
choice allows manufacturing with various types of team
ment.

For the molding of the part (dome + skirt), a portion of the tubular skirt is threaded around a punch so that its upper end protrudes by a chosen length of this punch. This skirt is then included between this punch and the die tools which define with this protruding end, with tools inside the punch and with die bottom tools, an annular gap supplied with plastic material, typically by at least two injection channels. lateral or oblique.

The annular molding interval thus defined has, in cross section, the profile of the dome part to be produced, and allows the desired part (dome + skirt) to be obtained from the mold release. The skirt is connected to the dome part of this part by an internal tube which comes to adapt to the mounting in the neck of the case.

The upper end of the skirt embedded in this tubing by molding can thus be found. either flush with the interior surface of the tubing so as not to rub inside the neck of the shoemaker during the fitting of the part (dome + skirt), or preferably in the thickness of this tubing and preferably even closer to the outer surface of the inner tubing of the dome than to its inner surface. Experience has further shown that the usually very thin sheath, for example 0.2 to 0.3 mm thick tends , once used as a pocket, to be closed at the end of emptying by twisting effect, and that when the upper end of this pocket was welded to the tubing of the dome for only 3 to 4 mm. This drawback is avoided and a more complete emptying of the bag is obtained at the end of dispensing of the product by taking a higher internal tubing of the dome and by molding so that the end of the bag is included in the thickness of the bag. , that is to say typically of this tubing over 10 to 20 min in height, optimally 10 to 15 mm.

Once this part (dome + skirt) has been produced, the manufacturing sequences can vary significantly, with operations being divided between the packaging manufacturer and the conditioner to the best of their ability.

According to a first range of manufacturing, the other assembly and packaging operations are carried out in the following order:
a) the lower end of the skirt of the part is closed (dome
+ skirt), this skirt becoming a pocket;
b) this pocket of the previous piece has become inserted (dome
+ pocket) in the case;
c) this part is tightly fixed by its dome part at the end
upper half of the bootmaker; then at the conditioner.

d) the product to be dispensed is filled from above
from the pocket;
e) the means is fixed in a sealed manner to the top of the dome part
distribution system comprising either a valve or a return pump
little or no air;
f) when the dispensing means comprise a valve,
introduces pressurized gas between the pocket and the housing.

According to a second manufacturing range in which packaging and assembly are integrated, the other assembly and packaging operations are carried out in the following order:
al) the dome of the part (dome + skirt) is fixed in a leaktight manner
distribution means comprising either a valve or a pump
with little or no return air;
bl) the whole obtained is turned over and the skirt filled, closed
by the dome and by said distribution means; from product to
distribute, by the lower end of this skirt located in posi
high tion;
cl) closing said end of the skirt, which becomes a pocket;
dl) the pocket filled with the new assembly obtained (dome) is introduced
+ pocket + distribution means) in the housing;
el) this new assembly is tightly fixed by its dome part
at the upper end of the case;
fl) when the distribution means comprise a valve,
introduces pressurized gas between the pocket and the housing.

In the case where the distribution means then comprise a low or no return air pump provided with an annular fixing flange at least externally made of plastic, it is advantageous in series production to carry out the fixing of this pump to the dome - that is to say operation (al) - at the same time as the fixing of the skirt or dome by molding. The elementary molding process already described for the part (dome + skirt) is modified in that the annular molding cavity defining the dome comprises the periphery of the annular rim of the pump. The tools containing the pump and protecting it from overheating in the molding are a lower tool with a central cavity surmounted by a rim supporting said rim in a leaktight manner, and a tool at the bottom of the matrix covering the pump and resting on the rim, completing the seal against the molten plastic. The connection obtained between the dome and the rim of the pump is either a weld if the plastics concerned are of the same nature, or a bonding with intimate adhesion, without reflow, ensuring however, as has been verified, a good seal when the materials plastics are dissimilar, for example polypropylene for the pump ring and PE-HD for the dome. To improve the strength of this fixing and the security of the corresponding seal, it is then advisable to provide the annular flange in its part included by molding at least one fine rib or circular groove. Once the assembly (dome + skirt + pump) thus obtained, we continue with operations (bl) to (el).

According to a third manufacturing range and in the case where a metal shoemaker is used comprising a tubular body and a separate bottom, for example both made of tinplate or possibly aluminum, the other assembly and packaging operations are carried out in the next order
a2) the dome of the workpiece (dome + skirt) is fixed in a leaktight manner
distribution means comprising either a valve or a pump
with little or no return air;
b2) the skirt of the assembly obtained is introduced (skirt + dome + means
distribution) in the body of the housing;
c2) said assembly is fixed in leaktight manner by its dome part to
the upper end of said boot body; then at the condition
neur:
d2) the complex assembly obtained is returned and the skirt is filled,
closed by the dome and said product distribution means
to distribute, by the lower end of this skirt located in
high position;
e2) the said end of the skirt is closed, which becomes a pocket,
and if necessary, this end is returned to the boot body;
f2) we crimp the metal bottom which is drilled with a hole on
the open lower end of the metal body;
g2) when the distribution means comprise a valve,
introduces a pressurized gas between the pocket and the housing and
plugs the hole in the metal bottom.

As in the second manufacturing range, in the case where the distribution means comprise a low or no return air pump carrying an annular fixing rim at least externally made of plastic, it is advantageous to first produce a dome plastic molded both on the skirt forming the blank of the pocket and around said pump fixing flange.

After having thus produced an assembly (dome + skirt + pump), we continue with operations (b2) and (c2), then usually at the conditioner with the same operations (d2) to (g).

We can go further in the pre-assembly by molding and directly make an assembly (dome + skirt + pump + metallic tubular body), which then replaces the elementary molding (dome + skirt) and operations (a2) to c2).

The molding tools are of the same type as those described by the variant of the second production range, with the following modifications: there is a double concentric punch allowing the positioning of the skirt of the pocket and the skirt of the body metallic tubular and mold release, and the annular molding cavity surrounds a rolled edge prepared at the upper end of the metallic tubular body, the dome being connected at this level by filling the inside and outside of this edge . This rolled or folded edge is not closed and can be much less tight than a rolled edge for crimping, which is an advantage of ease of manufacture and flexibility.

The complex assembly then obtained is then ready for the conditioning operations (d2) to (f2).

In addition to the moldings of sets of parts or "sub-sets of distributors" already described; different methods of fixing the part (dome + skirt) can be used and will be described with reference to the examples and the drawings which illustrate them. The method of closing the lower end to give a pocket is important to facilitate re-entry of the pocket into the case, it will also be explained.

The invention also relates to the pre-assembled part (dome + skirt) as well as the various assemblies or sub-assemblies produced.

EXAMPLES
Figure 1 shows a preassembled part (dome + skirt) in axial section.

FIG. 2 represents a distributor obtained from this part (dome + skirt), also in axial section.

Figures 3 and 4 show the contours of two end closures of the skirt, in section perpendicular to the axis.

Figures 5 to 7 show different modes of sealed connection of the dome and the upper end of a metal case, in axial half-section.

FIG. 8 represents a part (dome + skirt), the dome of which is provided on its reverse side with an insert forming a barrier for perfumes, in axial half-section.

Figure 9 shows the assembly of a part (dome + skirt) and the upper end of a plastic housing, in axial half-section.

FIG. 10 shows a dispenser with a metal case, the bottom of which is to be crimped, corresponding to the third manufacturing range described, in partial axial section.

EXAMPLE 1
The part (dome + skirt) of FIG. 1 comprises a dome 2 made of high density polyethylene (PE.HD) molded on the upper end portion 3 of a metalloplastic skirt 4 with an outside diameter of 35 min and a thickness of 0, 28 mm comprising 5 layers, either from the outside to the inside:
- 1 layer of white PE.BD (added with titanium oxide powder)
90 µm thick;
- 1 layer of 30 µm EAA copolymer adhesive;
- 1 layer of aluminum 40 µm thick;
- 1 new layer of the same adhesive of 30>im;
- 1 inner layer of medium density PE 90 pm thick.

The upper end 3 of the skirt 4 has been trapped by molding in an inner tube 5 of the dome 2, with an outside diameter of 36.3 min, over a height of 13 mm, its inner and outer layers therefore being partially recast. and welded and the plastic overlap of the dome 2 being 0.8 mm on the outside and 1.5 mm on the inside.

This arrangement ensures at the top of the skirt closed in the pocket sufficient rigidity so that the opening of this ppche remains during the last product distributions.

The dome part 2 comprises on the outside of its internal tube 5 a semicircular groove 6, of radius 1.5 mm in axial section and of average diameter 42 mm, the outside diameter of the dome 2 being 45 mm.

The dome 2 comprises at its upper end an external bulge 7 allowing the crimping of a metallic valve cup or dispensing pump.

EXAMPLE 2
The part (dome +. Skirt) 1 was used to manufacture a pocket dispenser 8 (FIG. 2) according to the method of the first manufacturing range. The lower end 9 of the skirt 4 has been closed by arc welding, this end being folded back into a semicircular lined shape 10 as shown in the diagram in FIG. 4 and pinched 6 minutes high by welding. This arrangement gives a welded end 12 of the pocket 13 of curved shape but of the same diameter as the skirt 4 and presenting no difficulty of introduction into the case 11. After welding, the weld 12 has been freed from approximately 2 min. , thus eliminating its excess length from the non-welded outer end.

FIG. 3 represents, in the same way as FIG. 4, another so-called "bellows" folding mode 14 providing the same advantage of non-enlargement of the end of the pocket, the closure of the end then being carried out by gluing, or by welding, the latter being more delicate than in arc welding.

The housing 11 of the distributor 8 is made of aluminum with a thickness of the cylindrical body 0.35 min and an opening or groove 15 with an internal diameter of 36.5 mm surmounted by a rolled edge 16 over approximately 150 with an external radius of 1.3 mm. . The fixing of the dome 2 to the rolled edge 16, after the closure of the pocket 13 and its introduction into the housing 11 was made by surface oxidation of the circular groove 6 of the dome 2 (treatment
Corona) and bonding with cyanoacrylic glue to this groove 6 fitted on the rolled edge 16 and held down for a little more than 1 minute during the drying of the glue.

Other known methods for treating the surface of the plastic throat can be used, for example a treatment with a flame or with a shaped electrode (Corona effect).
The metal fixing cup 17 of a distribution means 18, here capped with a pusher-diffuser 19, has been crimped with a seal under the bulge 7 of the upper end of the dome 2. When this means 18 is a product outlet valve, the annular gap 20 between the housing 11 and the pocket 13 is filled with a pressurized gas and the tight plug 21 is then replaced. When the means 18 is a pump without air intake, there is no need for propellant gas and putting the outside of the bag 13 at atmospheric pressure is sufficient, which simplifies the packaging.

In the present case, the plug 21 is removed, and the bottom 22 of the case provided with an orifice for the passage of any air has only a protective role for the pocket, not necessary for the operation of the distribution.

EXAMPLE 3
The attachment of the dome 2 of the prefabricated part (dome + skirt) 1 to the housing is typically done by the packaging manufacturer. Various methods can be used in mass production. The methods which relate to metal housings, typically aluminum or tinplate of thickness 0.2 mm to 0.6 mm, the distributors being as we have already seen pressurized or not, are commented below in relation with Figures 5 to 7.

FIG. 5 represents the fixing of a dome 2 provided with a skirt 4, of the same geometry as in the first two examples, on a shoemaker
It is identical to the case of FIG. 2, using an annular connecting piece 23 compatible both with the plastic of the dome 2 - here of HDPE - and the metal of the case 11 - here of the aluminum.

This 0.2 mm thick piece 23 is in a complex containing the same polyolefin as that of dome 2, that is to say of PE, and of EAA; its outer edge is snapped onto the end of the rolled edge 16, and after the installation of the part 1, the dome 2 coming to be applied by its circular groove 6 on the connecting part 23, the welding is carried out by the 'one of the following methods: by high frequency induction, by rotation, or by ultrasound by modifying the shape of the dome for the support of the ultrasonic transducer.

In FIG. 6, it can be seen that the dome 2, put in place by its circular groove 6 on the rolled edge 16 of the housing II, has a circular groove end 6 projecting about 1 mm beyond the end of the rolled edge 16, without obstructing the interior of this rolled edge 16. By annular injection of plastic material of the same nature as that of the dome, here of PE, at least partially fills the interior cavity of the rolled edge 16 by partially melting the outer lip 24 of the dome bordering the end of the circular groove 6, this lip 24 having at this point 1 mm thick. A good quality sealed welded connection is obtained. In general, the end 24 of the dome 2 thus secured by the molding must come in the vicinity of the end of the rolled edge, ie less than 0.5 mm before this end or slightly further leaving at least 1 min of passage towards the inside of the rolled edge 16.

The method of fixing in FIG. 7 uses an annular piece of form 25 made of plastic material of the same nature as that of the dome 2, the top of which is not shown, this piece 25 being placed on the end of the housing. constriction 26 before rolling its end edge. This part 25, here in PE like the dome 2, has a base 27 resting on the shoulder 26 of the housing 11, an upper portion 28 which will be crimped as shown by rolling the upper end edge of the housing, as well as one or more surfaces, here the two surfaces 29 and 30, coming into contact with the outer skirt 31 of the dome 2. The positioning of the shaped part 25, the rolled edge 16 and the dome 2 being made, the waterproof fixing is carried out by welding by rotation of the annular surfaces 29 and 30 against the annular portion 31 of the dome 2. The fixing can also be made by welding by HF induction or by ultrasound.

EXAMPLE 4
The external geometry of the preassembled part 101 (FIG. 8) is the same as that of the part 1, but the reverse surface 32 of its dome 102 was provided during the molding of this dome 102 on the skirt 4 with an annular washer. 33 with barrier effect. This washer 33 is welded to the dome 102 by a large face 34 and retained at its base by a small annular bead of plastic material 35. It generally has surface layers of polyolefin compatible with the polyolefin of the dome and an intermediate layer of Al or barrier plastic. The metalloplastic complex 0.28 mm thick in the first example is used here for the washer 33.

EXAMPLE 5
The housing 110 of FIG. 9 is made of plastic, here HDPE 0.6 mm thick in its cylindrical part. This molded housing has at its upper end 116 a lll tubing of rectangular axial section which fits tightly between the inner tubing 115 and an annular groove 114 of the dome 112, the tubing 111 applying by its horizontal end against the bottom of the groove 114. The fixing is preferably made by rotation welding, it can also be carried out by gluing. The horizontal annular surface 113 and the end of the outer lip 117 of the dome 102 can also intervene in this fixing.

EXAMPLE 6
FIG. 10 illustrates the process of the third manufacturing range.

The pre-assembled part 1 is the same as in the first two examples, and the fixing of this part 1 to the upper end of the housing 211 with a separate bottom 212, tin box with an outside diameter of 47 mm and a thickness of 0.3 mm is made like that of the second example, the skirt 4 not however being closed. A cover 213 is adapted to protect the distribution means 18 and 19, and the filling is done in the inverted position by the open end of the skirt 4 projecting from the body of the housing 211. The end of the skirt 4 is then closed, typically by one of the methods already described in the second example, the closed end is freed and it is returned to the body 211, then the bottom 212 is crimped. The distributor is then pressurized if necessary as already described.

APPLICATIONS
The application of the manufacturing process of the invention and of the corresponding bag dispensers is extended to the distribution of aerosol products, liquids and creams or gels, in the pharmaceutical, cosmetological, hygienic and food fields.

Claims (16)

1. Method of manufacturing and packaging a dispenser  pocket (8), said dispenser (8) comprising a housing (11; 211)  surmounted by a dome (2; 102), a flexible waterproof pocket (13) attached  inside this housing (1) and distribution means  (18,19) tightly connected to said dome (2; 102) and to said  pocket (13), characterized in that, before any other operation  assembly and packaging, a dome is produced by molding  made of plastic (2; 102) having an inner tube  (5; 115) molded on the upper end (3) of a skirt (4) forming  the blank of the pocket (13), thus obtaining a preassembled part  (dome + skirt) (1; 101), the dome (2; 102) further comprising  fixing portions (6; 114) (7) respectively on the end  upper (16; 116) of the housing (11 ;; 211) and to the distribution means  (18.19). 2. Method according to claim 1, in which the others are carried out.  assembly and packaging operations in the following order:  a) the lower end (9) of the skirt (4) of the  piece (dome + skirt) (1; 101), this skirt (4) becoming a pocket  (13);  b) introducing this pocket (13) of the previous part which has become  (dome + skirt) (1) in the housing (11; 211);  c) this part (1; 101) is tightly fixed by its part  dome (2) at the upper end (16; 116) of the housing (11; 201);  d) filling of the product to be dispensed by the  top of the pocket (13);  e) sealingly fixed to the top (7) of the dome part (2; 102)  the distribution means (18,19) comprising either a valve  (18), or a pump (18) with little or no air intake ;;  f) when the distribution means comprise a valve  (18), a pressurized gas is introduced between the pocket (13)  and the housing (11; 211). 3. Method according to claim 1, in which the others are carried out.  assembly and packaging operations in the following order:  al) sealingly fixed to the dome (2; 102) of the workpiece (dome  + skirt) (1; 101) the distribution means (18,19) comprising  either a valve or a low or no return air pump;  bl) we return the set obtained (1 and 18.19) and we fill  the skirt (4) closed by the dome (2; 102) and by said means  distribution (18,19) of the product to be distributed, by the end  lower (9) of this skirt (4) located in the high position;  c1) closing said end (9) of the skirt, which becomes a  pocket (13) ;;  dl) the pocket (13) filled with the new assembly obtained is introduced  (dome + pocket + distribution means) (1 and 18.19) in the  housing (11).  el) this new assembly is sealed (1 and 18.19)  by its dome part (2; 102) at the upper end (16; 116)  of the housing (11: 211);  fl) when the distribution means (18,19) comprise  a valve (18), a pressurized gas is introduced between the  pocket (13) and the housing (11; 211 and 212). 4. Method according to claim 3 in the case where the means for distributing  bution include a return or zero return pump carrying a  annular rim for fixing at least externally in material  plastic, in which a plastic dome is first made  that (2) molded at the same time on the skirt (4) forming the blank of the  pocket (13) and around said pump fixing flange, then  in which the operations (bl) to (el) are executed. 5. Method according to claim 1, in the case where a  metal housing comprising a tubular body (211) and a bottom  (212) distinct, and in which the other operations are carried out  assembly and packaging in the following order:  a2) sealingly fixed to the dome (2) of the part (dome  + skirt) (1) the distribution means (18,19) comprising either  a valve, either a low or no return air pump;  b2) the skirt (4) of the assembly obtained is introduced (skirt + dome  + distribution means) in the body (211) of the housing;  c2) said assembly is tightly fixed by its dome part  (2) at the upper end (6) of said housing body (211);  d2) we return the complex set obtained and we fill the  skirt (4) closed by the dome (2) and said means (18,19)  distribution (9) of this skirt (4) located in the high position:  e2) the said end of the skirt (4) is closed, which becomes a  pocket (13), and this end (9) is retracted if necessary,  in the body of the case (211);  f2) the metal bottom (212) which is pierced with a hole is crimped  on the open lower end of the metal body (211);  g2) when the distribution means comprise a valve,  a pressurized gas is introduced between the pocket (13) and the  housing (211) and plug the hole in the metal bottom (212). 6. Method according to claim 5, in the case where the means of  distribution (18,19) include an air return pump (18)  weak or zero carrying at least one annular rim  externally made of plastic, in which we first realize  a plastic dome (2) molded at the same time on the skirt (4)  forming the blank of the pocket (13) and around said fixing flange  of the pump (18) then in which the operations (b2) are carried out  to (f2). 7. Method according to claim 5, in the case where the means of  distribution (18,19) include a low return air pump  or zero with at least an annular fixing flange  externally made of plastic, and where the upper end  of the housing body (11) carries a rolled edge (16), process in  which is first made a molded plastic dome (2)  both on the skirt (4) forming the pocket blank (13), on  said upper end of the housing (16) and around said flange  fixing the pump, then in which the operations are carried out  (d2) to (f2). 8. Method according to any one of claims 1 to 7, wherein  the interior tubing (5; 115) of the dome is molded  (2) on the skirt (4) forming the blank of the pocket (13) so  that the upper end (3) of this skirt (4) is included  in the thickness of said tube (5; 115). 9. The method of claim 8, wherein the upper end  (3) of said skirt (4) is included in the thickness of said  tubing (5; 115) over a height of 10 to 20 mm, so as to allow  when using a better emptying of the pocket (13).  10. Method according to any one of claims 2 to 7, in which  the lower end (9) of the skirt (4) is closed by folding  bellows (14) and bonding or welding. 11. The method according to any of claims 2 to 7, wherein  the lower end (9) of the skirt (4) is closed by welding  arched (10).  12. Method according to any one of claims 2 to 4, in which  the case (they) is made of plastic and in which we fix  the dome (112) at the upper end (116) of this housing (110)  by rotary welding.  13. Method according to any one of claims 2 to 7, in which  the housing (11; 2li) is metallic and has at its end  upper a rolled edge (16), the dome fixing portion (2)  on the housing (11; 211) having a circular groove (6)  fitting on this rolled edge (16), and in which one fixes so  sealing said circular groove (6) in plastic material  metallic turtleneck (16).  14. The method of claim 13, wherein said fixing  is carried out by surface treatment of said circular groove  (6) followed by its bonding on said turtleneck (16). 15. The method of claim 13, wherein there is between  said turtleneck (16) and said circular groove (6) a piece of  link (23) compatible with both the metal of the turtleneck (16)  and with the plastic material of the dome (2), and in that we perform  then welding the dome (2) and the turtleneck (16) of the housing  (11) by a process of the group formed by: induction welding  high frequency, ultrasonic welding and welding  rotation.  16. The method of claim 15, wherein the housing (11)  is aluminum or alloy and the dome is polyolefin, said  connecting piece (23) being plastic containing WATER  and said polyolefin; 17. The method of claim 13, wherein the circular groove  (6,24) of the dome (2) extends to the vicinity of the end of the  rolled edge 16) of the housing and in which the dome is secured  (2) and said rolled edge (16) by annular lateral injection of  plastic of the same nature as that of the dome (2).  18. Process according to claim 13, in which around  from the narrowed upper end (21) of the front housing (11)  rolling of its end edge an annular piece (25) of material  plastic of the same nature as that of the dome (2), this part (25)  comprising above a base (27) which rests on the shoulder  (26) of the housing (li), an upper portion which will be crimped by  the roll (16) of the end edge, of the case (11), as well as a  or several surfaces (29,30) which will come into contact with the dome  (2; 31) when placing said dome (2) on the housing ;;  and in which the end edge (16) of the housing (11) is rolled  around said upper portion (28? of said annular piece  (25), then place the dome (2) on the upper end  (16) of the housing (11) thus prepared and the fixing of the  dome (2) and said upper portion (28) of said piece  annular (25) by rotation welding.  19. Method according to any one of claims 1 to 9, in which  the dome (2) is made of polyolefin, and in which the skirt (4) roughly  pocket (13) is in complex comprising a barrier layer and  surface layers of polyolefin compatible with polyolefin  dome (2). 20. The method of claim 19 ,. in which the surface upside down  (32) of the dome (102) is provided with an annular barrier washer  (33) fixed by molding, this washer (3S) comprising at least  surface layers of polyolefin compatible with polyolefin  dome (2) and an intermediate layer of aluminum or material  plastic barrier 21.Piece pre-assembled by molding (dome + skirt) (l; l01), the dome  (2; 102; 112) in polyolefin having an inner tube (5; 115)  molded on 1 upper end (3) of the skirt (4) whose layers  surface are made of polyolefin compatible with polyolefin  dome (2; 102; 112), the dome further comprising a portion of  fixing (6; 24) on the upper end (16 ;; li6) of a housing  (11; 110; 211) and an upper portion (7) allowing the attachment  a valve or a pump (18). 22.Distributor sub-assembly for product filling by the  top of the pocket, comprising a part pre-assembled by molding  (dome + pocket) (2 + 13), - the dome (2) being made of polyolefin and comprising  an inner tube (5; 115) molded on the upper end  (3) of the skirt (4) closed at its lower end (9) so  forming the pocket (13), the surface layers of said skirt  (4) being in polyolefin compatible with the polyolefin of the dome  (2), and further comprising a metal housing (11) or a housing  made of plastic (110), said dome (2) being fixed so  watertight at the upper end (16; 116) of the housing (li ;; 110) and  comprising an upper portion (7) allowing the attachment of a  valve or pump (18). 23.Distributor sub-assembly for product filling by  the lower end (9) of the skirt (4) before it is closed in  pocket (13), comprising a part pre-assembled by molding (dome  + skirt) (2; 102) tightly fixed by its dome part in  polyolefin (2) at both a valve or a return pump (18)  little or no air and at the upper end (16) of the body  tubular metal case (211) with bottom (212) separates, said  metal housing (211) having at its upper end  a rolled edge (16) and said dome (2; 102) having a groove  circular (6) tightly fixed on this rolled edge (16). 24.Pocket dispenser (8) comprising a metal housing (11; 211)  the bottom of which is pierced with a hole, this housing (11; 211) comprising  at its upper end a rolled edge (16) and being surmounted  polyolefin dome (2) of a part pre-assembled by molding  (dome + skirt) (1), this dome - (2) having a circular groove  (6) by which it rests and is tightly fixed on said  rolled edge (16), this dome (2) being further fixed by its part  upper (7) than a valve (18) or an air return pump  weak or zero. 25. The dispenser of claim 24, including the metal housing  is made of tinplate and includes a tubular body (211) and a bottom  (212) separate, said bottom (212) being crimped or crimped on said  tubular body (211). 26.Pocket dispenser comprising a tubular body (110) of material  plastic surmounted by the polyolefin dome (112) of a pre-piece  appeared by molding (dome + pocket) (112 and 13), the end  upper (116) of said tubular body (110) being fixed so  waterproof to said dome (112) using one or more surfaces  annulars (113) in contact with corresponding surfaces  (114,117) of the dome (112), this dome (112) being further fixed so  tight to a low or no return air pump (18) by seam  wise or by molding, said tubular body (110) ensuring the placing  at atmospheric pressure of the bag (13) during use  from the distributor.