초록 ▼

The invention relates to a bag of variable volume able to contain fluids and designed to be introduced into a container through the container's neck, said bag consisting of a pouch with one closed end and one open end, the open end being dimensionally stable over temperature ranges of from −30 to 55

The invention relates to a bag of variable volume able to contain fluids and designed to be introduced into a container through the container's neck, said bag consisting of a pouch with one closed end and one open end, the open end being dimensionally stable over temperature ranges of from −30 to 55° C., to a device incorporating said bag and to a process for filling it.

대표청구항 ▼

1. A method for manufacturing a bag of variable volume able to contain fluids and designed to be introduced into an outer container through the container's neck, said bag consisting of a pouch with one closed end and one open end, the open end being dimensionally stable over temperature ranges of fr

1. A method for manufacturing a bag of variable volume able to contain fluids and designed to be introduced into an outer container through the container's neck, said bag consisting of a pouch with one closed end and one open end, the open end being dimensionally stable over temperature ranges of from −30 to 55° C., the method comprising a step consisting of making the open end approximately 2 to 6% larger than its final size; and applying a heat treatment at least to the outermost part of the surface of said open end for a period of approximately 10 s to approximately 60 s at a temperature between approximately 120° C. and 350° C., thereby the coefficient of expansion of said open end is divided by 1.5 by comparison with the rest of the bag in a range of temperatures of from −30 to 55° C. 2. The method as claimed in claim 1, wherein the outer wall of the open end has a screwthread. 3. The method as claimed in claim 1, wherein the outer wall of the open end has at least one radial protuberance designed for crimping. 4. The method as claimed in claim 1, wherein the outer wall of the open end has at least one lateral ring designed for welding. 5. The method as claimed in claim 1, wherein the open end consists in part of an inner or outer reinforcing collar. 6. The method as claimed in claim 5, wherein the reinforcing collar is made of a material less sensitive to thermal variations than the material of the bag. 7. The method as claimed in claim 2, wherein at least part of the open end is made of a material less sensitive to the thermal variations than the material of the bag. 8. The method as claimed in claim 1, wherein it is made larger than its final size and heat treated before being placed in a mold and cooled. 9. The method as claimed in claim 1, wherein it is fitted with a control for opening a valve to dispense the fluid it is intended to contain. 10. The method as claimed in claim 3, wherein at least part of the open end is made of a material less sensitive to the thermal variations than the material of the bag. 11. The method as claimed in claim 1, wherein the bag is made of a transparent material and is intended to be introduced into an outer container which is made of transparent materials. 12. The method as claimed in claim 1, wherein, in a range of temperatures of from −30 to 55° C., the coefficient of expansion of said end is divided by 2 by comparison with the rest of the bag. 13. The method as claimed in claim 1, wherein, in a range of temperatures of from −30 to 55° C., the coefficient of expansion of said end is divided by 3 by comparison with the rest of the bag. 14. The method of claim 9 where said control for opening a valve is a spray device.