Flexible pouch with reinforcement to facilitate pouring

Abstract: A flexible pouch made from at least one layer of plastic material bonded to form a closed inner chamber for storing liquid. Peripheral portions (14, 16, 18, 20) of the wall material are contoured and then bonded to form a closed pouring spout (24) at a corner of the pouch. The configura­ tion of the spout is defined by the contour of the bonding in the vicinity of that pouch corner. The pouring spout is opened by cutting the pouch corner at an angle. The flexible walls of the pouch are reinforced (22) in the vicinity of the pouring spout to prevent folding. The open spout is intended to be inserted in the open neck of a container to be refilled.

Description: This invention relates to a flexible pouch made of laminated material used for refilling other containers with liquid, and in particular, to a flexible pouch with reinforcement adjacent to a pouring spout to facilitate pouring. Conventional flexible pouches having a spout for pouring liquid stored therein are disclosed in US-A-4,285,376, 4,491,245 and 4,578,813. Such conventional flexible pouches suffer from the disadvantage that during pouring, the pouch is susceptible to folding which blocks the discharge of liquid through the pouring spout. The use of flexible pouches made of laminations of plastic material to dispense liquids is well known. One such pouch is disclosed in US-RE 24,251. A pouch made of metallic foil and having a contoured pouring spout is disclosed in US-A-3,907,164. However, this conventional package has a reduced storage capacity due to the shape of the container and has no means for facilitating the pouring of liquid from the container into the neck of another container. The latter disadvantage arises because when the pouch is turned to the pouring position, its pouring spout does not make use of the contoured configuration. On the contrary, the contour merely serves to define the pouring spout and not to receive the neck of another container. EP-A-0012275 discloses a flexible pouch having a strengthening strip 6 which is disposed parallel to the cut line 5a-5b which is used to form an opening in the pouch when it is wished to dispense the contents from the pouch. An object of the invention is to overcome the foregoing disadvantages of conventional flexible pouches for storing liquids. The present invention aims to provide a sealed flexible pouch affording a contoured spout having a reinforced structure which facilitates the pouring of liquid from the pouch into another container. The invention also aims to provide a pouch in which the spout is not blocked during pouring by folding of the flexible walls of the pouch. According to the present invention a flexible pouch for storing liquid therein, comprising first and second flexible walls, made of sheet material, the said first and second flexible walls being bonded along their periphery by means of a sealed juncture, the said first and second flexible wall means and the said sealed juncture defining a closed chamber, the said pouch carrying one or more strengthening strips is characterised in that the said pouch has a shape with a recess for defining a spout portion suitable for use as a spout when the said walls are cut, the said spout portion having a stiffening strip of material secured to at least one of an inner or outer surface of at least one of the said first and second walls for supporting the said first and second wall of the spout in an open condition upon liquid being dispensed from the spout. The said flexible walls and the said spout means are preferably integrally formed. The strip of substantially stiff material may be secured to an inner surface or to an outer surface of one or both of the said first and second walls. The said strip may have a stiffening rib secured thereto. A flexible pouch in accordance with a preferred embodiment of the invention is made from at least one layer of plastic material sealed to form a closed inner chamber for storing liquid. Alternatively the pouch may have laminated walls comprising a layer of foil adhered to a layer of plastic. A pouch in accordance with preferred embodiments of the present invention has a peripheral edge formed by fin-sealing two layers of wall material together. In accordance with one preferred embodiment, two sheets of wall material are fin-sealed together along their entire peripheries. In accordance with another preferred embodiment, one portion of the peripheral edge of a folded single sheet of wall material is fin-sealed to the remaining portion of the peripheral edge of that single sheet. Accordingly the first and second wall means need not be integrally connected and the said juncture will then have a closed contour. When the first and second wall means are integral and the pouch is made by folding over the sheet material the juncture will be afforded by the adhered region around most of the periphery of the pouch but by the fold line over the rest of the periphery. A self-standing pouch in accordance with preferred embodiments of the present invention is preferably gusseted at its bottom to enable the pouch to stand in an upright position when filled with liquid. The peripheral portions of the wall material are contoured and then heat-sealed or joined by adhesion to form a closed pouring spout at a corner of the pouch. The configuration of the spout is defined by the contour of the sealing in the vicinity of that pouch corner. The pouring spout is opened by cutting the pouch corner preferably at an angle. In accordance with preferred embodiments of the present invention, the sealed periphery has a generally rectangular contour, except that the contour of the sealed peripheral edge has an inwardly curved portion corresponding to a recess in the wall material, which recess partly defines the spout configuration. Blockage of the pouring spout due to folding of the flexible wall material is prevented in accordance with the present invention by the stiffening strips. The invention may be put into practice in various ways and a number of specific embodiments will be described by way of example with reference to the accompanying drawings in which: Figure 1 is a side view of a flexible pouch with reinforcement in accordance with a first preferred embodiment of the invention; Figure 2 is a partial side view of the flexible pouch of Figure 1 with the spout open and a partial sectional view of the neck of a container to be filled in which the open spout has been inserted; Figure 3 is a perspective view of the flexible pouch of Figure 1 with the spout open; Figure 4 is a detailed view taken along section 4-4 of Figure 1 and illustrating the reinforcement of the inside of the flexible pouch in accordance with the first preferred embodiment of the invention; Figure 5 is a detailed sectional view illustrating the reinforcement of the outside of the flexible pouch in accordance with the first preferred embodiment of the invention; Figure 6 is a side view of a flexible pouch with reinforcement in accordance with a second preferred embodiment of the invention; Figure 7 is a perspective view of a flexible pouch with a modified form of reinforcement to prevent foaming in accordance with a third preferred embodiment of the invention; Figure 8 is a detailed view taken along section 8-8 of Figure 7 illustrating the reinforcement of the inside of the flexible pouch in accordance with the third preferred embodiment of the invention; and Figure 9 is a detailed sectional view illustrating the reinforcement of the outside of the flexible pouch in accordance with the third preferred embodiment of the invention. In accordance with the first preferred embodiment of the invention depicted in Figures 1 to 3, pouch 10 is constructed from two sheets 12 of flexible wall material which are sealed together along their peripheral edges to form a closed inner chamber for holding liquid. The wall material is 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. During manufacture, two sheets 12 of wall material having the same shape are arranged against each other with their peripheries mutually overlapping. The corresponding peripheral edges 14, 16, 18 and 20 are bonded by heat sealing, sonic welding, adhesive or like means to form a closed inner chamber of the pouch. The bottom edge 20 may be gusseted along the contour 30 to enable the pouch to stand upright when filled with liquid. Alternatively the chamber could be formed from a single sheet of wall material by folding the wall material and then bonding the overlapping portions of the periphery of the single sheet. After the first bonding operation, a recess 34 is formed in the respective sheets of wall material by cutting into the side peripheral edge 16. This recess has a maximum height measured along the said side peripheral edge 16 which is greater than the maximum depth measured in a direction transverse to the direction along which the height is measured. Further, in accordance with the first preferred embodiment of the invention, the recess begins at a point spaced from the top of the pouch. After the recess 34 is formed, the respective sheets of wall material are bonded by heat sealing, sonic welding, adhesive or like means along the rim of the recess to again close off the pouch chamber. In accordance with the first preferred embodiment of the invention, the bonded edge of the recess 34 has a generally inwardly curved portion 28 with generally straight portions 26 and 32 extending therefrom. The portion 26 is substantially parallel to top peripheral edge 18 of the pouch. The recess 34 defines a closed pouring spout 24. The contour depicted in Figure 1 maximizes the storage capacity of the pouch, enhances the structural strength at the pouring spout and permits refilling of containers having necks of different diameters. To prevent folding of the flexible pouch walls during pouring, reinforcement means 22 are arranged substantially parallel to the top peripheral edge 18 and extending from the closed spout 24. As best seen in Figures 3 to 5, the reinforcement means 22 in accordance with the first preferred embodiment of the invention comprise a pair of stiff strips bonded, for example, by welding or taping, to the inner surfaces of the opposing walls 12 of the pouch. The strip may further be provided with a longitudinal stiffening rib. Alternatively, the reinforcing means can take the form of a stiffening rib secured to the inner wall surface by tape. Any material of sufficient stiffness may be used to reinforce the top portion of the pouch to prevent folding in the vicinity of the pouring spout, including wood, metal, or plastic. In accordance with the first preferred embodiment, the reinforcement means 22 can be bonded to the outer surfaces of the opposing walls 12 of the pouch, as depicted in the sectional view of Figure 5. In either case the reinforcement means should be bonded to the walls before the top peripheral edges 18 of the walls are bonded. The reinforcement means need not be strips of stiff material, but could be a stiff mesh or reinforced tape. Figure 2 depicts the refilling of a container 42 by inserting the open spout of pouch 10 in open neck 40. The spout 24 is opened by cutting along line A--A (see Figure 1). The cut A--A should preferably be made at an angle of 30 to 60 degrees with respect to the top peripheral edge 18, more preferably 45 degrees. A 45-degree cut permits the liquid contents of the pouch to be readily drained through spout opening 36 and into neck 40 of container 42. In accordance with a second preferred embodiment of the invention depicted in Figure 6, pouch 10 is constructed from two sheets 12 of flexible wall material which are bonded together along their peripheral edges to form a closed inner chamber for holding liquid. The wall material is 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. During manufacture, two sheets 12 of wall material having the same shape are arranged against each other with their peripheries mutually overlapping. The corresponding peripheral edges 14, 16, 18 and 20 are bonded to form a closed inner chamber of the pouch. The bottom edge 20 may be gusseted along the contour 30 to enable the pouch to stand upright when filled with liquid. After the first bonding operation, the recesses 34 and 35 are formed in the respective sheets of wall material by cutting along side peripheral edges 16 and 14 respectively. Each recess has a maximum height measured along the said side peripheral edge 14 or 16 which is greater than the maximum depth measured in a direction transverse to the direction along which the height is measured. Further, in accordance with the embodiment of Figure 6, each recess begins at a point spaced from the top peripheral edge 18 of the pouch. After recesses 34 and 35 are formed, the respective sheets of wall material are bonded along the edges of the recesses to again close off the pouch chamber. Recesses 34 and 35 respectively define closed pouring spouts 24 and 25. The second recess can be formed simultaneously with formation of the first recess in the pouch. Moreover, if the pouches are formed in succession by bonding sheet material unrolled from continuous webs, the recesses in different pouches can be advantageously formed simultaneously. The walls can be formed from 12-micron-thick polyethylene terephthalate film laminated to 152-micron-thick linear low-density polyethylene film, whereas the reinforcement strip with stiffening rib can be formed with a 150-micron-thick polyethylene strip secured to the walls by adhesive. The dimensions of the pouch in a preferred embodiment are as follows: width -- 130 mm; height -- 230 mm; width of juncture -- 5 mm; height of spout -- 18 mm; length of reinforcing strip -- 11.5 cm (115 mm); width of stiffening rib -- 1.2 mm. Figures 7 to 9 depict a flexible pouch with a modified form of reinforcement to prevent foaming in accordance with a third preferred embodiment of the invention. Reinforcement means 102 comprise a pair of arched strips made of suitably stiff material, such metal, plastic or wood. Strips 102 can be bonded to either the inner or outer wall surfaces in the vicinity of top peripheral edge 18, as respectively shown in Figures 8 and 9. The reinforcing strips 102 terminate at the spout opening 36. Numerous modifications are possible in light of the above disclosure. For example, the preferred pouch 10 includes sheet walls 12 which are bonded together at their peripheral edges 14-20 to define an inner chamber. A bottom edge 20 is gusseted along a contour 30 to provide a self-standing feature. Alternatively, the pouch could be formed from a single folded sheet bonded at its overlapping edges, and a contoured gusseted insert. Similarly, although the spout 24 is preferably opened by a cut A--A at a 45-degree angle relative to the peripheral edge 18, this angular relation is not critical.

Claims: A flexible pouch for storing liquid therein, comprises first and second flexible walls (12), made of sheet material, the said first and second flexible walls being bonded along their periphery by means of a sealed juncture (14-20), the said first and second flexible wall means and the said sealed juncture defining a closed chamber, the said pouch carrying one or more strengthening strips, characterised in that the said pouch has a shape with a recess (34, 35) for defining a spout portion suitable for use as a spout when the said walls are cut, the said spout portion having a stiffening strip of material (22, 102) secured to at least one of an inner or an outer surface of at least one of said first and second walls for supporting the said first and second wall of the spout in an open condition upon liquid being dispensed from the spout. A flexible pouch as claimed in Claim 1, characterised in that the said strip has a stiffening rib secured thereto. A flexible pouch as claimed in any one of Claims 1 to 2 characterised in that the stiffening strips extend substantially parallel to the longitudinal axis of the spout.

Inventors: KRISTENSEN KNUD NORVANG, SHERMAN ADAM, SWANSON JOHN HENRY, VAN GORDON TODD DONALD, KRISTENSEN, KNUD NORVANG, SHERMAN, ADAM, SWANSON, JOHN HENRY, VAN GORDON, TODD DONALD
Applicants: COLGATE PALMOLIVE CO, COLGATE-PALMOLIVE COMPANY (A DELAWARE CORPORATION)
Application year: 1990
Main classification: B65D33
IPC codes: B65D33, B65D75