Abstract:
The present invention relates to a package having a flexible wall and containing liquid products. The invention also relates to a method for manufacturing the package and a coupling therefor. A perforation means (6) for making a hole in the flexible wall (3) is provided not to make a hole in said wall when an inner and an outer coupling device (4, 5) are interconnected but make a hole (7) in the flexible wall (3) after said interconnection of the inner and outer coupling devices (4, 5).

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a package having a flexible wall and adapted for liquid products, preferably foodstuff in liquid form, whereby an inner coupling device is provided within unopened portions of the flexible wall, whereby the inner coupling device and an outer coupling device are connectable to each other and whereby the outer coupling device includes a perforation means for making a hole in said unopened portions of the flexible wall such that the liquid product can he discharged from the package through said hole. The invention also relates to a method for manufacturing said package and a coupling therefor. 
     U.S. Pat. No. 4,603,793 relates to a package of flexible wall material and an inner as well as an outer coupling device. At this package, perforation of the flexible wall is carried through simultaneously with the interconnection of the coupling devices. This normally functions well, but leakage may occur at certain flexible wall materials during the connection/perforating step. 
     SUMMARY OF THE INVENTION 
     The object of the present invention has been to provide a package with improved opening possibilities. This is arrived at by providing the package according to the invention with the characterizing features of subsequent claim 1. 
     The invention also includes a method for manufacturing said package and a coupling for said package. 
     Since no holes are made in the flexible wall of the package when the outer and inner coupling devices are connected to each other, it is seen to that no portions of the content of the package can flow or run out of the package. First when this liquid tight coupling has been established, perforation of the flexible wall of the package may occur in a simple and effective manner. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be further described below with reference to the accompanying drawings, in which 
     FIG. 1 is a perspective view of members of the package according to the invention; 
     FIG. 2 is a section through the members of FIG. 1, whereby the package is unopened; and 
     FIG. 3 is a section through the members of FIG. 1, whereby the package is opened. 
    
    
     DESCRIPTION OF PREFERRED EMBODIMENT 
     In the drawings, there is shown a package 1 for liquid products 2, preferably foodstuff in liquid form such as beverages of low viscosity and more viscous foodstuff such as ketchup, mustard and sauces. The package 1 has flexible walls 3 of plastic material, i.e. it is of plastic bag type. Inside the package 1 there is provided an inner coupling device 4 to which an outer coupling device 5 can be connected through the flexible wall 3. 
     The outer coupling device 5 has a perforation means 6 for making a hole 7 in the flexible wall 3 so that the product 2 can be removed or discharged from the package 1 through the inner coupling device 4, said hole 7 and the outer coupling device 5. 
     The perforation means 6 is provided not to make the hole 7 in the flexible wall 3 when said inner and outer coupling devices 4, 5 are interconnected, but may be used for making said hole 7 during a perforating step after said interconnection. 
     The inner coupling device 4 may include an inner coupling member 8 in the form of a first annular member 8a with an opening 9. This first annular member 8a may be located at or next to the inner side of the flexible wall 3 and the inner coupling device 4 may also include a second annular member 8b and said annular members 8a, 8b may be connected to two or more connection members 11 with intermediate openings 12. 
     The connection members 11 extend in an axial direction relative to the inner coupling device 4 and the inner coupling member 8 has retaining members 13, 14 which protrude radially in opposite directions relative to the connection members 11. 
     The outer coupling device 5 also includes a coupling means 15 which may be connected to the inner coupling device 4 without opening the flexible wall 3 and so that said wall will lie between the coupling means 15 and the inner coupling member 8 of the inner coupling device 4. 
     To permit said connection between the coupling means 15 and the inner coupling device 4, the coupling means 15 includes preferably an outer coupling member 16 with a substantially U-shaped cross section and with two retaining members 17, 18 which are directed towards each other in a radial direction relative to the coupling member 16. The inner coupling member 8 of the inner coupling device 4 is designed to fit into the outer coupling member 16 so that a space for unopened portions of the flexible wall 3 is defined between the inner and outer coupling members 8, 16. 
     During connection of the coupling means 15 and the inner coupling device 4 to each other, the coupling means 15 is located such that its outer coupling member 16 engages the flexible wall 3 beside the inner coupling device 4. Thereafter, the flexible wall 3 with the coupling means 15 is pressed in and the coupling means 15 displaced in a radial connecting direction K towards the inner coupling device 4 until the retaining members 17, 18 of the coupling means 15 and portions 19, 20 of the flexible wall 3 are situated within the retaining members 13, 14 on the inner coupling member 8 of the inner coupling device 4. With this displacement of the coupling means 15 relative to the inner coupling device 4, the outer coupling member 16 of said coupling means 15 is brought to stick to the inner coupling member 8 of the inner coupling device 4 through said intermediate portions 19, 20 of the flexible wall 3. After said interconnection the flexible wall 3 will thus be situated in said space between the coupling means 15 and the inner coupling device 4, whereby unopened portions 21 of said wall cover the opening 9 in the inner coupling member 8. 
     The coupling means 15 also includes a centering member 22 for holding the perforation means 6 in a centered position relative to the opening 9 in the inner coupling device 4. This centering is easily established since the coupling means 15 has a stop member 23 which prevents further displacement of the coupling means 15 relative to the inner coupling device 4 when the centering member 22 has reached its predetermined position KL (see FIG. 2) relative to the opening 9 while the stop member 23 through the flexible wall 3 abuts the inner coupling device 4. 
     The centering member 22 of the coupling means 15 has inner threads 24 and a member 25 of the perforation means 6 engaging the centering member 22 has one or more outwardly directed portions 26. The outwardly directed portions 26 mesh with the inner threads 24 such that the perforation means 6 is guided from a stand-by position BL in a perforating direction H to a perforating position HL for making a hole in the portions 21 of the flexible wall 3 when said perforation means 6 is pivoted or rotated relative to the centering member 22. 
     The inner threads 24 of the coupling means 15 preferably have such pitch that the perforation means 6 is pivotable or rotatable less than one turn from the stand-by position BL (see FIG. 2) to the perforating position HL (see FIG. 3). 
     The perforation means 6 preferably includes a perforation member 27 which during or after perforation of the portions 21 of the flexible wall 3 can penetrate into the opening 9 in the inner coupling device 4. Said perforation member 27 preferably includes at least one axially outwardly directed perforation element 28 which is adapted to make a hole in the portions 21 of the flexible wall 3 when the perforation means 6 is pivoted or rotated relative to these portions 21 about a centre line C which extends axially relative to the two coupling device 4, 5 when they are interconnected. 
     The perforation means 6 further includes an edge 29 which is adapted to limit its depth of penetration into the opening 9 after perforation of the flexible wall 3. Furthermore, the perforation means 6 may also have a radially sideways directed twist grip 30 with a connecting portion 31 for a hose 32 as well as a through-flow passage 33, such that the liquid product 2 can flow from the package 1 through the opened hole 7 and the through-flow passage 33 to the hose 32 and further to e.g. a pump or a valve (not shown) or another dispensing device for dispensing the product 2. 
     It can also be mentioned that the flexible wall 3 preferably also has such elasticity that it can be stretched or extended without breaking when the outer coupling device 5 is connected to the inner coupling device 4. Additionally, it should be mentioned that the inner coupling device 4 preferably is fixedly attached to the inner side of the flexible wall 3. 
     The embodiment described above is presented for explaining the invention, not limiting it. Thus, it should be mentioned that it is possible within the scope of the following claims to design the inner and outer coupling devices 4, 5 in other ways than shown and described without loosing the essential functions of connecting said devices to each other and making a hole after said interconnection.