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A sealing device includes a top part forming a bell and a bottom part forming a vat, receiving a container to be sealed with a film in the chamber defined by the top and bottom parts. The top part includes on a side supplying the film, a slot for the passage of the film running through a wall of the

A sealing device includes a top part forming a bell and a bottom part forming a vat, receiving a container to be sealed with a film in the chamber defined by the top and bottom parts. The top part includes on a side supplying the film, a slot for the passage of the film running through a wall of the top part, and a device, preferably an inflatable pipe, for obstructing the slot and blocking the film. The wall of the top part also includes a device for inserting and/or extracting fluid, opening inside the chamber between the slot and the wall lower edge, for extracting gas under vacuum, injecting gas and/or filling the container.

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1. A sealing device for a machine for packaging products under a controlled atmosphere in containers having an upper opening surrounded by a rim on which a sealing film is to be welded for sealing the container, said device comprising: a stationary top part forming a bell, said top part comprising

1. A sealing device for a machine for packaging products under a controlled atmosphere in containers having an upper opening surrounded by a rim on which a sealing film is to be welded for sealing the container, said device comprising: a stationary top part forming a bell, said top part comprising a fixed one-piece circumferential wall having a lower free edge; a bottom part forming a pan having an upper free edge, for receiving at least one container to be sealed, said bottom part being vertically movable between a lower position and an upper position such that in said upper position, said free edges of said top and bottom parts directly engaging one another with said edge of said container therebetween, and said top and bottom parts defining a sealed enclosure around said container; and a welding head movably mounted through an opening in said top part so as to be within a space defined by said fixed one-piece circumferential wall, said welding head being movable vertically up and down between an upper retracted position above said edge of said container, and a lower welding position for welding said film on said edge of said container, said fixed one-piece circumferential wall comprising: means for feeding a continuous sealing film having a predetermined cross-section through a side of said fixed one-piece circumferential wall and over said opening of said container, said side of said fixed one-piece circumferential wall having a slot having an upper and a lower surface and a fixed cross-section greater than the cross-section of said film, said film passing between said upper and lower surfaces, said slot being above said lower free edge;an inflatable hose in said slot for closing said slot and immobilizing said film in said slot when actuated; andmeans for passing fluid through said fixed one-piece circumferential wall located between said slot and said lower free edge, so that fluid entering inside said enclosure enters between said edge of said container and said film, before said film is welded on said edge of said container by said welding head when said welding head is in said lower welding position,said fixed one-piece circumferential wall being fixed with respect to said means for passing fluid.2. The device according to claim 1, wherein said inflatable hose is in a hole in said fixed one-piece circumferential wall extending over an entire longitudinal length of said slot so that said slot is secant to said hole.3. The device according to claim 1, wherein said means for passing fluid through said enclosure comprise at least one gas injection orifice.4. The device according to claim 1, wherein said means for passing fluid through said enclosure comprise at least one gas extraction orifice.5. The device according to claim 1, wherein said means for passing fluid through said enclosure comprise at least one spout for filling said container inside said enclosure.6. The device according to claim 1, wherein said top part comprises a mounting plate and said fixed one-piece circumferential wall is removably attached to said mounting plate.7. A sealing device for a machine for packaging products under a controlled atmosphere in containers having an opening surrounded by a rim on which a sealing film is to be welded for sealing the container, said device comprising: a stationary bell shaped top part having a circumferential wall with a lower free edge, a side of said circumferential wall having first and second stationary parts defining a slot therebetween having an upper and a lower surface having a first fixed cross-section and for receiving a continuous film between said upper and lower surfaces, said film having a second cross-section, said first cross-section being greater than said second cross-section, said slot being above said lower free edge; a movable bottom part forming a pan having an upper free edge, for receiving at least one container to be sealed, in a first position, said top and bottom parts containing and sealing said container; a welding head movably mounted through an opening in said top part so as to be within a space defined by said circumferential wall, said circumferential wall comprising: (a) an inflatable hose located on at least one of said first and second stationary parts for closing said slot and immobilizing said film in said slot when inflated; and(b) means for passing fluid through said sealed enclosure between said slot and said lower free edge, so that fluid doing one of entering inside said enclosure and exiting said enclosure does one of enters and exits between said edge of said container and said film,said circumferential wall being fixed with respect to said means for passing fluid.8. The device according to claim 7, wherein said container is one of a tray or a pot.9. The device according to claim 7, wherein said packaging products are foodstuffs.10. The device according to claim 7, further comprising a resilient seal connected to said upper free edge.11. A sealing device for a machine for packaging products under a controlled atmosphere, said products being filled in a container having an upper opening surrounded by a rim on which a sealing film is to be welded for sealing the container, said device comprising: a top part forming a bell; a bottom part forming a pan for receiving said container to be sealed; and a welding head, a) said top part comprising a plate and a surrounding frame below the plate, said frame comprising side walls surrounding an interior space of the top part, said frame being one-piece and having a lower free edge, one of said side walls of said frame having:1) a through slot having an upper and a lower surface passing a width of said one of said side walls and extending inside of the interior space above the lower free edge, said slot having a cross section adapted to receive a continuous web of sealing film passing through said upper and lower surfaces of said slot,2) a controlled-actuation closure and immobilization means in said slot within the width of said one of said side walls, for closing in a sealed manner said slot and immobilizing said continuous web of sealing film passing through said slot, when actuated; and3) means for passing fluid through said one of said side walls, said means for passing fluid being fixed with respect to said one of said side walls, said means for passing fluid extending into the interior space between said through slot and said lower free edge, so that fluid entering through said means for passing fluid enters in said interior space between said lower free edge of said one of said side walls and said continuous web of film passing through said slot;b) said bottom part having an upper free edge, and being movable vertically up and down with respect to said top part, between a lower position and an upper position in which said upper free edge of said bottom part engages said lower free edge of said frame of said top part, such that in said upper position, said lower free edge of said frame of said top part and said upper free edge of said bottom part are adapted to engage with a rim of a container received in the bottom part, so as to define a sealed enclosure around said container;c) said welding head being movably mounted through an opening in said top part so as to be within said interior space surrounded by said side walls of said frame, said welding head being movable vertically up and down between an upper retracted position and a lower welding position.12. The device according to claim 11, wherein said closure and immobilization means comprise an inflatable hose in said one of said side walls on at least one side of said slot.13. The device according to claim 12, wherein said inflatable hose is in a hole in said one of said side walls extending over an entire longitudinal length of said slot so that said slot is secant to said hole.14. The device according to claim 11, wherein said means for passing fluid thro ugh said one of said side walls comprise at least one gas injection orifice.15. The device according to claim 11, wherein said means for passing fluid through said one of said side walls comprise at least one gas extraction orifice.16. The device according to claim 11, wherein said means for passing fluid through said one of said side walls comprise at least one spout for filling said container inside said enclosure.17. The device according to claim 11, wherein said side walls are removably attached to said plate.18. The device as claimed in claim 11, wherein the closure and immobilization means and the means for passing fluid are independently operable.