Flexible pouch with folded spout

Abstract: A flexible pouch (10) formed from a single sheet of plastic material folded over upon itself along an umbrella like fold assembly (14) to provide the opposed walls of a chamber for storing a product and an optional second sheet to form the bottom of the chamber. The walls and the bottom are sealed along their periphery to form the chamber. The pouch has a self-opening spout (34) formed in part by the fold assembly which expands and springs open when the sealed end of the spout is cut off. The fold assembly (14) not only provides a large spout opening, but also provides a spring force which keeps the spout open so that all the product may be emptied from the chamber.

Description: This invention relates generally to a flexible pouch constructed of laminated plastic material used for containing a fluid product and in particular to a flexible pouch having a novel self opening spout arrangement to facilitate pouring of all the product from the pouch. More particularly, this invention relates to a flexible pouch the construction of which makes it useful for refilling other containers. Conventional flexible pouches having a spout for pouring liquid stored therein are disclosed in U.S. Pats. 3,171,581, 3,907,164 4,283,376, 4,332,344, 4,491,245, 4,578,813 and Re 24,251. While pouches of this type have become very popular, particularly for environmental considerations, they suffer a common disadvantage that the spout of those pouches has a tendency to close upon itself during the pouring operation which blocks the discharge of the liquid through the spout. As a result it is difficult to empty all the liquid from the pouch. One attempt to overcome this problem is disclosed in U.S. Patent Application Serial No. 327,659 filed on March 23, 1989 and assigned to the same assignee as this application. The proposal set forth in that application represents a substantial improvement over the prior art. In similar fashion the invention as set forth in this application and described below provides a novel self opening spout design having an enlarged pouring opening which stays open as the liquid is emptied from the pouch. US-A-4,332,344 discloses a flexible pouch having the features of the preamble of claim 1. SUMMARY OF THE INVENTION The primary object of this invention resides in the provision of a flexible pouch the walls of which are formed from a single sheet of material folded back upon itself and having a novel self opening spout that opens quickly and remains open as all the liquid is poured from the pouch. The bottom of the pouch can be formed from a second film. The peripheral edges of the sidewalls and the bottom are sealed to form the pouch. Another object of the invention resides in the provision of the above pouch wherein a portion of the spout includes a fold assembly which provides a resilient spring force for opening the spout when its sealed edge is cut. The spring force also keeps the spout open so that all the liquid in the pouch may be emptied therefrom. A further object of the invention resides in the provision of a pouch having the above described novel self-opening spout wherein the upper portion of the spout includes an umbrella like fold assembly which produces an opening spring force when the sealed edge of the spout is cut off. These objects are achieved by the features of the characterizing part of claim 1. In a preferred embodiment of the invention the above described pouch includes a recess immediately below the spout, the recess facilitating the pouring of the liquid through the spout into containers having various neck diameters. BRIEF DESCRIPTION OF THE DRAWING Fig. 1 is a side perspective view of a flexible pouch incorporating the novel folded pouring spout of the invention; Fig. 2 is a fragmentary sectional view taken along line 2-2 of Fig. 1; Fig. 3 is a fragmentary side perspective view of the spout in its open pouring condition; Fig. 4 is a fragmentary view showing the pouch and its spout in the pouring position with respect to the neck of a container. Fig. 5 is a schematic illustration of a manufacturing process and equipment by which the pouch illustrated in Figs. 1-3 may be produced; Fig. 6 is a fragmentary sectional view taken along line 6-6 of Fig. 5; Fig. 7 is a fragmentary sectional view taken along line 7-7 of Fig. 5; Fig. 8 is a fragmentary sectional view taken along line 8-8 of Fig. 5; Fig. 9 is a fragmentary sectional view taken along line 9-9 of Fig. 5; Fig. 10 is a fragmentary sectional view taken along line 10-10 of Fig. 5. DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, the sidewalls of pouch 10 are formed from a single sheet of flexible plastic material folded over at its top edge 12 via fold assembly 14 to provide opposing front and back walls 16 and 18. The bottom wall is preferably provided by a second sheet of flexible plastic material. The sidewalls and the bottom wall are sealed together peripherally along their side edges 20 and 22 and bottom edge 24 to form a closed inner chamber. The bottom edge of the pouch may be gussetted along contour 26 to enable the pouch to stand upright when the inner chamber is filled with liquid. Although it is preferred to have a separate bottom wall so as to form a gusseted container, the sidewalls can be sealed along their full periphery in order to form the pouch. This is the case since the primary distinctive feature of the present pouches resides in the contruction of the pouring spout and the method of producing this pouring spout. The wall materials are preferably transparent or translucent plastic of a type which will not react with the ingredients in the liquid to be stored in the pouch chamber. The peripheral edges of the material are bonded together by heat sealing, dielectric sealing, sonic welding, adhesive, or other suitable means to form the closed inner chamber of the pouch. The side edge 22 includes a recessed section 28 having an upwardly and inwardly inclined sealed edge 30 terminating in a lateral sealed edge 32 spaced below top edge 12 so that the upper portions of walls 16 and 18 between top edge 12 and edge 32 define a pouring spout 34 at a corner of the pouch. To pour the liquid from the pouch the sealed edge 36 of spout 34 is cut off to form opening 38 and the spout is inserted into the open neck 40 of a rigid container 42 (Fig. 4). Recess 28 conveniently accommodates container necks of different diameters and facilitates pouring of all the liquid from the pouch into the container. As discussed initially hereinabove, many prior spout designs have experienced a problem with blockage during the pouring process because the opening of the spout is too small and the walls of the spout tend to close upon themselves. The novel self opening spout 34 shown in the drawings overcomes those problems and enables all the liquid to be poured from the pouch. The fold assembly 14 at top edge 12 is formed by doubling upper portions 40 and 42 of walls 16 and 18 outwardly and under back upon themselves along fold lines 44, 46 and 48 in umbrella type fashion (Fig. 2). Fold assembly 14 forms the upper part of spout 34. Wall portions 40 and 42 are of substantially uniform depth and extend transversely across the total width of pouch 10. As shown in Fig. 1 the sealed side edge 20 extends to the top of the pouch and seals the back edge of fold assembly 14. The front sealed edge 36 of spout 34 extends to the top and seals the front of the fold assembly. To empty the liquid from pouch 10 the front sealed edge 36 is cut off causing the spout to open quickly to the position of Fig. 3 under the resilient spring force provided by folded portions 40 and 42. Because of the excess fold material at the top of the spout opening 38 this spout opening is large and the spring loaded fold assembly prevents the opening from closing as liquid is poured from the pouch. The pouch illustrated in Figs. 1-3 may be manufactured using bag making apparatus 50 shown schematically in Figs. 5-10. The main body of pouch 10 is formed from a continuous main web 52 of plastic material unrolled from a coil 54. The gusset 26 is formed from a second web 56 of plastic material unrolled from a coil 58. Web 56 is narrower in width than web 52. A drive roller assembly 60 intermittently advances the webs through the various operational stations of appratus 50. Web 52 is advanced from coil 54 to a tension roller assembly 62 which keeps the web taught so that an air actuated male/female die punch assembly 63 can create top side seal holes in the web by which the upper side edge of the pouch may be subsequently tacked. After web 52 leaves the last roller of assembly 62, it is drawn over a forming plow 64 which folds the web in half (Fig. 6) into an inverted "U" shape open at the bottom. Plow 64 enlarges into a T-section 66 (Fig. 7) to form a flat 68 on the top of the web. The web is then advanced into another side plow assembly 70 (Fig. 8) which wraps the web around the T-mandrel. Next the web passes through a top plow 72 (Fig. 9) which flattens the web against the T-mandrel to provide an excess of material. The T-mandrel tapers down into a straight mandrel, while plow 72 tapers down into an inverted U shaped channel configuration (Fig. 10) so as to form the umbrella fold of Fig. 2. Immediately upon leaving channel 74 a heat sealing bar 76 tacks the fold assembly 14 at predetermined space intervals 78 to ensure that the assembly does not unfold. The bottom edges of folded web 52 are spread open by a spreader bar assembly 80 to allow for the introduction and positoning of the bottom gusset. The gusset web 56 is passed through a die punch assembly 82, a tension roller assembly 84, and then over a folding plow 86 by which it is folded in half in a U-shape and positioned vertically between the open bottom edges of folded web 52. The bottom gusset 26 is heat sealed at seal station 88 at the same time that edge 36 of the spout is sealed. In the next station 90 the bottom gusset is cooled and the recess area 28 is die cut. The side edges 20 and 22 are then sealed and cooled at stations 92 and 94, and finally the web is cut at station 96 into individual pouches. Each pouch remains open at recess 28 to permit subsequent filling. The process and apparatus of Figs. 5 to 10 are related to other processes and apparatus for producing pouches. However, the novel design of plow assemblies 64, 66, 70, 72, and 74 which cooperate to form the umbrella-like fold assembly 14 along the top of the pouch is a distinct advance in the art. This also provides for a positive pouring spout.

Claims: A flexible pouch comprising first and second opposed wall means (16, 18) of generally rectangular configuration formed from a single sheet material bent upon itself to provide a fold assembly (14) along its top edge (12) and closed around its first and second side edges (20, 22) and bottom edge (24) to define a chamber for storing a product, said wall means having wall portions forming spout means (34) at one corner thereof and defined by said top edge (12) and said second side edge (22), sealing means (36) normally closing said spout means (34), characterized in that said fold assembly is formed by upper wall portions (40, 42) doubled outwardly upon themselves and folded down along each wall portion into a generally umbrella shaped configuration and maintained in a folded condition by side edge sealing means comprising said spout sealing means (36), said fold assembly (14) providing a resilient spring force which opens said spout means (34) upon removal of said spout sealing means (36). The flexible pouch of claim 1, said fold assembly (14) being of substantially uniform depth and extending across said wall means (16, 18) to said second side edge (20). The flexible pouch of claim 1, comprising recess means (28) in said first side edge (22) adjacent said spout means (34) for accommodating the neck (40) of a container (42) as the product is poured through said spout means (34) into said container (42). A method for producing flexible pouches as disclosed in claim 1 comprising passing a first web (52) of a flexible plastic material over a shaping means to form the plastic material into an inverted U-shape, increasing the amount of plastic material forming the loop of the inverted U to provide for an excess of such material and doubling portions of the excess material outwardly upon themselves and folding them downwardly against the wall portions into a generally umbrella shaped configuration where they are maintained in a folded condition by the said edge sealing means (36). A method for producing flexible pouches as in claim 4 wherein after an excess of said first web (52) of flexible plastic material has been formed a second web (56) of a flexible plastic material is fed to a shaping means to form a U-shape and passed into contact with the inner surface of the first flexible plastic material with an inverted U-shape. A method for producing flexible pouches as in claim 5 wherein after said inverted U-shaped flexible plastic material of the second web (56) is contacted with said U-shaped flexible plastic material of the first web (52) sidewall seams (20, 22) and the bottom seams (26) are sealed. A method for producing flexible pouches as in claim 6 wherein after said seams (20, 22, 26) are sealed the pouch (34) is severed along at least one seam (36).

Inventors: DUNTON DAVID POWELL, DUNTON, DAVID POWELL
Applicants: COLGATE PALMOLIVE CO, COLGATE-PALMOLIVE COMPANY
Application year: 1991
Main classification: B65D33
IPC codes: B65D33, B31B19, B65D75, B65D35, B31B23