Claims
- 1. A bag for packaging liquid formed using plastic in film form, comprising a leaktight chamber for the liquid and a pocket, adjacent to this chamber, in which a pipe for withdrawing the liquid is housed, means being provided to give access to the inside of said pocket, an opening being formed through part of the wall of this pocket, adjacent to said chamber to allow said withdrawing pipe to enter said chamber in a leaktight fashion, wherein said opening is situated at the end of a tubular element of decreasing section, at the place where the section is the smallest, the element being formed from a film of plastic forming one wall of said pocket adjacent to said chamber, this tubular element being intended to accommodate said pipe for withdrawing the liquid from the chamber, the section of which is at least equal to that of said opening, so that said tubular element forms a seal around said withdrawing pipe.
- 2. The bag according to claim 1, wherein said means for giving access to the inside of said pocket comprise a tab cut from one of the layers of film intended to form said chamber and wherein said tab, with the exception of its free end, is attached to one of the layers of film forming said pocket, this attachment also extending right around the periphery of the tab.
- 3. The bag according to claim 1, wherein said bag comprises a first layer of film forming one of the walls of said chamber and a second layer of film, two edges of these first and second layers being adjacent to one another, while the opposite edge of the second layer is situated an appreciably shorter distance away from these adjacent edges than the opposite edge of the first layer, a third layer of film covers the second layer, one of the edges of said third layer of film being aligned with the adjacent edges of the first and second layers, the second and third layers being attached along the free edge of the second layer to form the bottom of said pocket, the opposite edge of this third layer to said adjacent edges extending beyond the bottom of said pocket, a fourth layer of film, two opposite edges of which coincide with those of the third layers being between the bottom of said pocket and their edges which lie beyond this bottom, along two non-converging lines to form a passage, the axis of which is approximately perpendicular to said bottom, this passage communicating on the one hand with said opening and on the other hand with the inside of said chamber, the walls of this passage being intended to be parted by said dispensing pipe and to close back up in the absence of this pipe in order to control the passage of the liquid, a fifth layer of film, forming the second wall of this chamber, being attached around the periphery of the first layer of film.
- 4. The bag according to claim 1, wherein said bag contains a passage which is open at both ends for controlling the flow of liquid between the inside and the outside of the bag, this passage being formed between two adjacent layers of film of plastic joined together along two non-converging connecting lines, the opening of the section of this passage being obtained by parting said layers of film from one another, two other adjacent layers of film which come from one and the same film of plastic folded over on itself and whose length, perpendicular to the axis of folding, is appreciably shorter than the corresponding length of said two first layers of film being inserted between them, the other end of said passage being adjacent to said fold, said tubular element of conical shape being formed across said fold and entering the opening of said passage, which opening is adjacent to this fold.
- 5. The bag according to claim 4, wherein the wall is formed by folding a film on itself about an axis parallel to the axis about which the second pair of films is folded.
- 6. The bag according to claim 5, wherein two said layers of film come from one and the same sheet folded about three parallel axes.
- 7. The bag according to claim 4, wherein said common sheet is formed by a tube.
- 8. The bag according to claim 1, wherein said pocket is divided into a number of compartments.
- 9. The bag according to claim 2, wherein said bag comprises a first layer of film forming one of the walls of said chamber and a second layer of film, two edges of these first and second layers being adjacent to one another, while the opposite edge of the second layer is situated an appreciably shorter distance away from these adjacent edges than the opposite edge of the first layer, a third layer of film covers the second layer, one of its edges bing aligned with the adjacent edges of the first and second layers, these second and third layers being attached along the free edge of the second layer to form the bottom of said pocket, the opposite edge of this third layer to said adjacent edges extending beyond the bottom of said pocket, a fourth layer of film, two opposite edges of which coincide with those of the third layers being between the bottom of said pocket and their edges which lie beyond this bottom, along two non-converging lines to form a passage, the axis of which is approximately perpendicular to said bottom, this passage communicating on the one hand with said opening and on the other hand with the inside of said chamber, the walls of this passage being intended to be parted by said dispensing pipe and to close back up in the absence of this pipe in order to control the passage of the liquid, a fifth layer of film, forming the second wall of this chamber, being attached around the periphery of the first layer of film.
- 10. The bag according to claim 2, wherein said bag contains a passage which is open at both ends for controlling the flow of liquid between the inside and the outside of the bag, this passage being formed between two adjacent layers of film of plastic joined together along two non-converging connecting lines, the opening of the section of this passage being obtained by parting said layers of film from one another, two other adjacent layers of film which come from one and the same film of plastic folded over on itself and whose length, perpendicular to the axis of folding, is appreciably shorter than the corresponding length of said two first layers of film being inserted between them, the other end of said passage being adjacent to said fold, said tubular element of conical shape being formed across said fold and entering the opening of said passage, which opening is adjacent to this fold.
- 11. The bag according to claim 10, wherein the wall is formed by folding a film on itself about an axis parallel to the axis about which the second pair of films is folded.
- 12. The bag according to claim 11, wherein two said layers of film come from one and the same sheet folded about three parallel axes.
- 13. The bag according to claim 10, wherein said common sheet is formed by a tube.
- 14. A method for the manufacture of bags and for packaging liquid in said bags continuously, comprising the steps of, starting from a film of plastic in strip form, wherein said film in strip form is made to travel longitudinally and wherein the bottom of said pocket is formed between two layers of film in strip form by attaching two films in strip form or by longitudinally folding a film in strip form, two layers of film in strip form appreciably wider than the depth of said pocket and intended to form said chamber are superimposed with the two faces of said pocket and one of their respective edges is aligned with the edges of the opening of said pocket so that access can be had laterally between these layers of film and wherein these layers are made to travel vertically downwards, the layers of film forming said pocket are parted, and said tubular seal and said opening are formed through a portion of its wall adjacent to said chamber, a pipe for withdrawing the liquid fron the chamber is inserted through this tubular seal, two attachment lines appreciably perpendicular to the fold line or join line of the walls of the pocket are formed, one on either side of said withdrawing pipe, between this fold or this join line and the edge of said strip where the various layers of film are aligned, these two attachment lines joining together the layers of film forming the pocket to the layer of film forming the wall of the chamber equipped with the means provided to give access to the inside of said pocket, all the layers of film are then attached, on the one hand transversely to said strip of film, on the other hand, along the two longitudinal edges of said strip of film in order to form said chamber, the upper edge of which is open, this chamber is then filled through this open edge and said bag is closed by attaching all the layers, transversely, along the upper edge of this chamber.
- 15. The method according to claim 14, said pocket is formed by arranging a second layer of film in strip form over a first layer forming one of the walls of said chamber, two longitudinal edges of this first layer and of this second layer being adjacent to one another, the width of this second layer corresponding to the depth of said pocket, a third layer of film in strip form which is wider is arranged over the second layer, the two layers forming said pocket are attached in the longitudinal direction of said film in strip form, approximately along the edge of the narrowest layer corresponding to the bottom of said pocket, a fourth layer of film in strip form with the same width as the third layer is added, this third layer and this fourth layer are attached between said longitudinal attachment forming the bottom of said pocket and their edges which lie beyond this bottom, along two non-converging lines to form a passage, the axis of which is more or less perpendicular to said longitudinal attachment, and a fifth layer is added to form the second wall of said chamber.
- 16. The method according to claim 14, wherein three strips of film are superimposed, a first strip intended to form the wall of the chamber, a second strip intended to form a passage forming a valve to control the flow of liquid, and a third intended to close the passage of said valve in a leaktight fashion, the width of this third strip being appreciably less than that of the second strip,wherein one of the respective longitudinal edges of these superimposed strips is made to coincide, wherein said second strip and said third strip are folded onto themselves so that their other respective longitudinal edges are superimposed with their three respective longitudinal edges that were aligned earlier so that the folded-over third strip stretches between the two superimposed halves of the second strip over a portion of its width, wherein the edges of said passage are attached in the part of said folded-over second strip which is not superimposed with the third strip folded over on itself and, at the same time, the folded-over edges of said second and third strips are attached to one another, and wherein said passage is cut near its end adjacent to the fold of said second strip.
- 17. The method according to claim 16, wherein said second and third strips of film are folded, said three strips are welded together in a region superimposed with said tab, leaving within this region an unwelded portion opposite the free end of the tab.
- 18. The method according to claim 14, wherein said method takes place in two separate phases, one consisting in forming a continuous strip of part-finished bags in which all the layers are attached to one another but are separate from one another along at least one longitudinal edge and along the transverse edges and the second consisting in forming said tubular seal, in inserting said withdrawing pipe therein and in packaging the liquid in said chamber.
- 19. The method according to claim 15, wherein said method takes place in two separate phases, one consisting in forming a continuous strip of part-finished bags in which all the layers are attached to one another but are separate from one another along at least one longitudinal edge and along the transverse edges and the second consisting in forming said tubular seal, in inserting said withdrawing pipe therein and in packaging the liquid in said chamber.
- 20. The method according to claim 16, wherein said method takes place in two separate phases, one consisting in forming a continuous strip of part-finished bags in which all the layers are attached to one another but are separate from one another along at least one longitudinal edge and along the transverse edges and the second consisting in forming said tubular seal, in inserting said withdrawing pipe therein and in packaging the liquid in said chamber.
- 21. The method according to claim 17, wherein said method takes place in two separate phases, one consisting in forming a continuous strip of part-finished bags in which all the layers are attached to one another but are separate from one another along at least one longitudinal edge and along the transverse edges and the second consisting in forming said tubular seal, in inserting said withdrawing pipe therein and in packaging the liquid in said chamber.
Parent Case Info
This is a continuation of co-pending PCT Application Ser. No. PCT/IB97/01584, filed on Dec. 19, 1997, entitled LEAKTIGHT CHAMBER, METHOD OF MANUFACTURE AND OF PACKAGING LIQUID IN THESE CHAMBERS, the disclosure of which in its entirety is incorporated by reference thereto herein.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2 711 115 |
Apr 1995 |
FR |
WO 95 23742 |
Sep 1995 |
WO |
WO 97 18143 |
May 1997 |
WO |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/IB97/01584 |
Dec 1997 |
US |
Child |
09/335146 |
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US |