DEVICE WITH RIGID RECEPTACLE AND FLEXIBLE CYLINDRICAL POUCH FOR PACKAGING FLUIDS

Abstract

The invention relates to a device for packaging and dispensing a fluid product, having a leaktight flexible pouch (1) placed in a rigid bottle (10) and associated with a pump or a valve (13), this pouch having a cylindrical wall consisting of a sheet (2) rolled into a cylinder, one edge of which is fixed in a leaktight fashion to a flange forming a ring for fastening to the bottle and to the pump or the valve, this flange (4) consisting of a plastic material, the other edge of the said sheet is fixed in a leaktight fashion to a second flange forming the bottom of the pouch, this second flange (3) consisting of a plastic material, these flanges (3, 4) having a solid disk or a ring having a raised edge (3A, 4A) forming an annular lateral surface, to which the edge of the said sheet (2) forming the wall of the pouch is fixed, the said sheet (2) of the cylindrical wall being a multilayer sheet having at least one inner film of plastic material.

According to the invention, the inner face of the said flanges carries a covering sheet (20A, 20B) entirely covering the inner face of the said flanges and also covering at least a part of the said inner annular lateral surface for fastening the edge of the said sheet (2) forming the wall of the pouch, and the said covering sheet (20A, 20B) has at least one film of the same plastic material as the said inner film of the said sheet of the cylindrical wall and a metal film, its plastic material film facing toward the inner face of the said sheet (2) constituting the cylindrical wall.

Figure to be published: 2

Claims

1-9. (canceled)

10. Device for packaging and dispensing a fluid product comprising: a leaktight flexible pouch placed in a rigid bottle; and a pump or a valve, this pouch having a cylindrical wall formed from a sheet rolled into a cylinder, one edge of which is fixed in a leaktight fashion to a flange forming a ring for fastening to the bottle and to the pump or the valve, this flange formed from a plastic material, the other edge of the said sheet being fixed in a leaktight fashion to a second flange forming the bottom of the pouch, this second flange formed from a plastic material, these flanges having a solid disk or a ring having a raised edge forming an annular lateral surface, to which the edge of the said sheet forming the wall of the pouch is fixed, the said sheet of the cylindrical wall being a multilayer sheet having at least one inner film of plastic material, wherein the inner face of the said flanges carries a covering sheet entirely covering the inner face of the said flanges and also covering at least a part of the said inner annular lateral surface for fastening the edge of the said sheet forming the wall of the pouch, and wherein the said covering sheet has at least one film of the same plastic material as the said inner film of the said sheet of the cylindrical wall and a metal film, its plastic material film facing toward the inner face of the said sheet constituting the cylindrical wall.

11. Device according to claim 10, wherein the said covering sheet has a metal film and at least one film of the same plastic material as the said flange, its plastic material film facing toward the inner face of the said flange.

12. Device according to claim 10, wherein the said metal film(s) is (are) made of aluminum.

13. Device according to claim 10, wherein said plastic material is polyethylene.

14. Device according to claim 10, wherein the said covering sheet is a multilayer sheet, its layers being made of polyethylene, polyethylene terephthalate, aluminum and polyethylene.

15. Device according to claim 10, wherein the said covering sheet is welded onto the inner face of the said sheet constituting the cylindrical wall.

Description

[0027] The invention is described in more detail below with the aid of figures, which only represent a preferred embodiment of the invention.

[0028] FIG. 1 is a view in vertical section of a device according to the prior art, and has already been described above.

[0029] FIGS. 2 and 3 are views in section, and in perspective in the case of FIG. 3, of a pouch of a device according to the invention.

[0030] FIGS. 4 and 5 are views in perspective of the flanges according to the invention, cut away in order to allow their cross section to be seen.

[0031] As represented in FIGS. 2 and 3, the invention relates to a device for packaging and dispensing a fluid product, having a leaktight flexible pouch 1 placed in a rigid bottle and associated with a pump or a valve, this pouch having a cylindrical wall consisting of a multilayer sheet 2 rolled into a cylinder, the edges of which are fixed in a leaktight fashion to two flanges 3, 4, of which one 3 forms the bottom of the pouch and the other 4 forms a ring for fastening to the bottle and to the pump or the valve.

[0032] Each flange 3, 4 has a solid disk or a ring having a raised edge 3A, 4A forming an annular lateral surface, to which the edge of the sheet of the cylindrical wall of the pouch is fixed.

[0033] The multilayer sheet 2 of the pouch 1 has at least one inner film of plastic material and a metal film, preferably a film of polyethylene and a film of aluminum. Preferably, it in fact consists of a multilayer sheet, these layers advantageously being, from the outer layer to the inner layer, made of polyethylene, polyethylene terephthalate, aluminum and polyethylene, in order to ensure optimal chemical and mechanical conditions.

[0034] The flanges 3, 4 consist of the same plastic material as the inner film of the sheet 2, and therefore preferably of polyethylene.

[0035] The inner face of at least one of the said flanges 3, 4 has a covering sheet 20A, 20B having a metal film and entirely covering the inner face of the corresponding flange.

[0036] To this end, the covering sheet 20A, 20B covers the inner face of the flange 3, 4 as well as at least a part of the inner annular lateral surface of its raised edge 3A, 4A.

[0037] The covering sheet 20A, 20B is identical to the multilayer sheet 2 constituting the cylindrical wall of the pouch 1 and is therefore a multilayer sheet, these layers being made of polyethylene, polyethylene terephthalate, aluminum and polyethylene.

[0038] The product to be packaged, intended to fill the pouch 1, therefore remains in contact with the polyethylene, but in a much smaller proportion by thickness, limiting any phenomenon of absorption and/or adsorption. Specifically, if the thickness of a flange 3, 4 is of the order of from to 1.5 mm, that of the film of polyethylene of the covering layer 20A, 20B is of the order of 0.1 mm.

[0039] Furthermore, since the covering sheet 20A, 20B has a film of polyethylene on its two faces, fastening by welding of the covering sheet and the flange is easy and, once covered, the flange has a film of polyethylene on the outer annular lateral surface of its raised edge, which allows easy fastening by welding of the sheet 2 of the cylindrical wall of the pouch 1, which itself has a film of polyethylene directed toward the flange.

[0040] Even though, in the scope of the invention, just one of the flanges 3, 4 may be equipped with such a covering sheet while providing an improvement in the conditions of evaporation, adsorption and/or absorption, optimally both flanges are made of plastic material, preferably polyethylene, and the inner face of the two flanges 3, 4 of the pouch 1 has such a covering sheet 20A, 20B, as represented in FIGS. 4 and 5. As can be seen in these figures, the covering sheet 20A, 20B preferably covers the entire inner annular lateral surface of the flanges 3, 4.

[0041] The process of fitting the covering sheet 20A, 20B on the corresponding flange 3, 4 is greatly facilitated by the fact that the plastic material constituting the flange and the film of plastic material of the covering sheet 20A, 20B is the same, and preferably polyethylene.

[0042] The covering sheet 20A, 20B is overmolded on the inner surface of the flange by the method known as In-mold labeling or IML. This method ensures optimal integration of the covering sheet over the entire inner face of the flange 3, 4, as well as over the annular lateral surface 3A, 4A. Further to the fact that this method can be fully robotized, it ensures perfect positioning of the covering sheet and therefore perfect and full covering of the inner face of each flange.