Cap assembly for slider valve for aseptic packaging

Abstract

The present invention provides a slider valve assembly for connection to a spout of an aseptically-packaged flexible container for filling and dispensing flowable material. The slider valve assembly comprises a cap member, a valve member, and an outlet member. The cap member has a central opening and is adapted to be secured to the spout of the container. The valve member defines one or more side openings in communication with a central bore, is slidable within the central opening of the cap member and is lockable into a closed or open position. The outlet member is detachably engaged to the valve member and is used for actuating the valve member. The outlet member also defines a hollow interior portion which is in communication with the central bore of the valve member.

Claims

1. A cap assembly for connection to a spout of a flexible container containing flowable material therein, the cap assembly consisting of: (a) a cap member positioned on the spout of the container, wherein said cap member having an interior wall that defines a through central opening in communication with the contents of the container and further defines a spout receiving portion and a top portion, said interior wall having an annular bead and said cap member having a radial shoulder; (b) providing an outlet member positioned on the valve member, the outlet member having a handle with locking lugs and thereby being removably engaged to the cap member; (c) a valve member having a central bore defining one or more side openings slidably enclosed within the central opening of the cap member and being lockable into a locked closed or open position; and (d) a flexible barrier layer removably and hermetically bonded to the top portion of the cap member covering the central opening of the cap member thereby hermetically sealing the flowable material of the container and the valve member.

2. The cap assembly of claim 1, wherein the flexible barrier layer is a tamper evident foil seal.

3. A flexible container comprising the cap assembly of claim 1.

4. A method for producing a flexible container aseptically packaged with flowable material consisting of the steps of: (a) providing a flexible container having a spout wherein the inside of the container is sterile; (b) providing a cap member positioned on the spout of the container and having a valve member having a central bore defining one or more side openings being movable to an open or closed position therein, said cap member having an interior wall that defines a through central opening in which the valve member is slidably enclosed, said cap member further defining a spout-receiving portion and a top portion; (c) sterilizing the spout of the container; (d) sterilizing the cap member and valve member; (e) filling the flexible container through the spout with flowable material; (f) securing the cap member to the spout of the container by engaging the spout receiving end of the cap member to the spout; and (g) removably bonding a flexible barrier layer to the top portion of the cap member for covering thereby hermetically sealing the valve member and the contents of the container therein.

5. The method of claim 4, wherein the flexible barrier layer is a tamper evident foil seal.

6. A method for dispensing the contents of a flexible container aseptically packaged with flowable material consisting of the steps of: (a) providing an aseptically packaged flexible container containing flowable material and having a spout on which the cap assembly of claim 1 having a flexible barrier layer thereon has been installed, the central bore of the valve member defining an interior wall and a central opening and wherein the side openings are in communication within the cap, said valve member being in the closed position wherein the side openings are sealed against the interior wall of the central opening of the cap member and no flow is permitted from the container to the spout; (b) the outlet member defining a hollow interior portion in communication with the central bore of the valve member and an outer portion on which a flexible tube or hose has been frictionally secured, said flexible tube or hose defining a fluid passage in communication with the hollow interior portion of the outlet member; (c) positioning the container into a desired location for dispensing; (d) removing the flexible barrier layer; (e) securing the outlet member to the slider valve member; and (f) depressing the outlet member towards the spout thereby engaging the outlet member to the cap member, sliding the valve member and locking it into its open position in which the side openings of the valve member become in communication with the container and flowable material is dispensed through the flexible hose or tube.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1a shows a cross-sectional view of the cap member with integrated slider valve member secured to the spout of the container in the shipping/storage configuration where the flexible barrier layer installed.

(2) FIG. 1b shows a cross-sectional view of the cap member with integrated slider valve member secured to the spout of the container with the flexible barrier layer removed.

(3) FIG. 2 shows a cross-sectional view of the slider valve assembly with the valve member in the closed position.

(4) FIG. 3 shows a cross-sectional view of the slider valve assembly with the valve member in the open position.

(5) FIG. 4 shows cross sections of all the components of the slider valve assembly in an exploded view.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

(6) Referring particularly to the drawings, the figures are for the purpose of illustrating one embodiment of the invention only and not for the purpose of limiting the same. FIGS. 1-4 illustrate a slider valve assembly 10 for aseptically-packaged flexible containers according to an exemplary embodiment of the invention generally comprising a cap member 40 adapted to the end portion 22 of a spout 20 of a flexible container B, a valve member 60 slidably fitting inside the cap member 40, and an outlet member 80 secured to the valve member 60.

(7) According to one embodiment and referring to FIGS. 1a and 1b, a flexible container B is provided with a spout 20. The configuration of the spout 20, shown in a preferred embodiment, is widely-used, commercially available, and is conventionally adapted to flexible containers such as bag-in-box systems. However, it is clear that the dispensing assembly of the present invention could also be modified and adapted to other types of spouts. The spout 20 comprises a generally cylindrical body that has a central opening 21 open at both ends. The central opening 21 of the spout 20 is in communication with the container. At its base, the spout 20 also has a relatively thin outwardly projecting flange 24 that is used to secure the spout 20 to an opening in the container wall B. The top surface 25 of the flange 24 is bonded to form a hermetically sealed connection with the inside surface 1 of the container wall B by means such as heat sealing or the like.

(8) Filling of the flexible containers such as bag-in-box may be performed on any suitable aseptic filler known to those skilled in the art, and is typically performed using commercial packaging systems such as the Liqui-Box Filler Model 2000 C1T-0-A (Liqui-Box Corp., Worthington, Ohio). Before filling and aseptic packaging, the container is supplied to the packaging system in a state where the inside of the container has been pre-sterilized using Cobalt gamma irradiation or any other suitable means of sterilization. The spout 20, cap member 40, and valve member 60 are then sterilized using Hydrogen Peroxide (H2O2) or any other suitable means. The container B is then filled with flowable material through the spout 20.

(9) Once the container B is filled, the cap member 40 and valve member 60 are secured to the spout 20 of the container B as described below and shown in FIGS. 1a and 1b. In addition, a flexible barrier layer 5 is removably and hermetically bonded to the top portion 52 of the cap member 40 covering the central opening 41 of the cap member 40 thereby hermetically sealing the valve member 60 and the contents of the container B. In order to maximize the shelf life of the product, the hermetic seal must remain until the contents of the container are firstly dispensed.

(10) The cap member 40 has a generally cylindrical shape but could be made to adapt other shapes of spouts such as oval or polygon-shaped. The cap member 40 has a through (open at both ends) central opening 41 and is adapted to be hermetically secured to the top end portion 22 of the spout 20 of the container B. During assembly of the cap member 40 on the spout 20, the cap member 40 and the spout 20 are firstly positioned such that the spout-receiving annular opening 44 receives the top portion 22 of the spout 20. An inward axial force is applied to the cap member 40 pressing the cap member 40 against the spout 20. As the cap member 40 is inserted onto the end portion 22 of the spout 20, the annular bead 42 extending radially inwardly inside the annular opening 44 forcefully and resiliently slides over and engages the outwardly projecting flange 23 of the spout 20. In addition, the inside surface 46 of the annular opening 44 of the cap member 40 simultaneously and forcefully slides against the annular bead 27 on the inside surface 28 of the spout 20. Once the annular bead 42 has slid completely passed the flange 23, surface 43 of the cap member 40 comes in contact with top surface 26 of the spout 20 and the extremity 47 of the exterior wall 45 of the cap member 40 also comes in contact with surface 29 of the outwardly projecting flange 30. Thus, the cap member 40 becomes secured to the spout 20 in a snap-fitting manner and a hermetic seal is created between the top portion 22 of the spout and the spout-receiving annular opening 44 of the cap member.

(11) Referring to FIG. 4, the valve member 60 is a generally cylindrical shape body which includes one or more side openings 62 along a side wall 66 that are in communication with a central bore 61. The central bore 61 is only open from the top side of the valve member 60. The valve member 60 is positioned such that it is slidably fitting and lockable within the central opening 21 of the spout 20. The valve member 60 could be made to adapt other configurations of cap member 40 having oval or polygon-shaped central openings 41.

(12) Referring to FIG. 4, the outlet member 80 is a generally cylindrical shape body having a hollow interior portion 81 that is open at both ends. The outlet member 80 also comprises a base portion 88 that is adapted to be secured to the valve member 60 and locking means adapted to engage with the cap member 40. In the subject embodiment, the outlet member 80 is illustrated as for connection with conventional hose line through the use of a standard ribbed exterior portion 82. Alternatively, other types of connections could be provided on the outlet member 80. In an alternate embodiment, the outlet member 80 could also be connected to a manifold system having multiple outlets (not shown). The outlet member 80 further comprises a handle portion 83 and one or more locking lugs 84.

(13) Before dispensing the flowable material from the container B, the flexible barrier layer 5 shown in FIG. 1a is first removed from the cap member 40. The outlet member 80 is then be secured to the valve member 60 as described below.

(14) Referring to FIGS. 2 and 4, the outlet member 80 is secured to the valve member 60 by firstly positioning the outlet member 80 in relation to the valve member 60 whereby the annular opening 65 of the valve member 60 receives the base portion 88 of the outlet member 80. As the outlet member 80 is pressed against the valve member 60, the smooth contoured surface 86 defined in the base portion 88 resiliently slides over the axially inwardly protruding annular ridge 70 of the valve member 60. As the base portion 88 of the outlet member 80 is fully inserted into the annular opening 65 of the valve member 60, the bottom surface 89 of the outlet member comes in contact with the bottom surface 69 of the annular opening 65 of the valve member 60. At this point, the base portion 88 of the outlet member 80 locks into position in a snap-fitting manner and the radial shoulder surface 87 becomes engaged to the lower surface 68 of the annular ridge 70.

(15) The dimensions of surface 90 in the base portion 88 of the outlet member 80 and surface 71 inside the annular opening 65 of the valve member 60 are designed such that a slight interference fit exists between these two mating surfaces. Therefore, as the base portion 88 of the outlet member 80 is inserted into annular opening 65 of the valve member 60, the mating surfaces 71 and 90 forcefully slide relative to each other and become resiliently pressed together. This creates a liquid impervious seal between the base portion 88 of the outlet member 80 and the annular opening 65 of the valve member 60.

(16) With the outlet member 80 secured to the valve member 60, the handle portion 83 can then be used to axially move (push or pull) the outlet member 80 together with the valve member 60. This movement also moves the sliding valve member 60 and locks it into an open or a closed position within the central opening 41 of the cap member 40.

(17) FIG. 2 shows the slider valve assembly 10 locked into the closed position. In the closed position, the bevelled surface 72 of the valve member 40 is in contact with the annular bead 48 protruding inwardly inside the central opening 41 of the cap member 40 thus creating a liquid impervious seal and isolating the one or more side openings 62 from the contents of the container B. The top surface 73 of the valve member 60 is also in contact with the radial shoulder surface 50 preventing the valve member 60 from further outward movement. The amount of force that is required to move the sliding valve member 60 inward from the closed position is significant enough that the slider valve assembly will not be accidentally opened by accidental nudging for example.

(18) FIG. 3 shows the slider valve dispensing assembly 10 with the valve member in the open position. Sliding the valve member into its open position is done by simply using the handle portion 83 to push the outlet member 80 axially inward towards the spout 20. The valve member 60 includes one or more side openings 62 along a side wall 66 that become exposed to the contents of the container when the valve member 60 is so slid in response to the outlet member 80 being pushed inwards.

(19) As the outlet member 80 is pushed inwards, the bevelled surface 72 forcefully and resiliently slides over the annular bead 48 protruding axially inwardly inside the central opening 41 of the cap member 40 allowing the valve member 60 to also slide inward. The fully opened position is reached once the bottom surface 64 of the annular ridge 63 comes in contact with the bevelled surface 49. At this point, the one or more openings 62 become in communication with the inside of the container B and the contents may be dispensed through the outlet member 80 as shown by the arrows F on FIG. 3.

(20) In the open position, the valve member 60 is locked into position by means of one or more locking lugs 84 on the outlet member 80 engaging the radial shoulder surface 50 of the cap member 40. Each locking lug of the subject embodiment comprises a longitudinally extending post or support 91 at the outer end of which is carried a protrusion 85 extending radially outwardly. When the outlet member 80 is pushed inwardly, it also pushes the valve member 60 into the open position and the protrusions 85 at the end of the locking lugs 84 engage onto the radial shoulder surface 50 of the cap member 40 in a snap-fitting manner thus creating a positive stop arrangement to hold the valve member 60 in the open position.

(21) Upon pulling of the outlet member 80 outward away from the spout, the locking lugs 84 disengage from the cap member 40 and the sliding valve member 60 is also pulled axially back into a closed position within the cap member 40 wherein the side openings 62 are no longer in communication with the container B.

(22) The amount of force that is required to slide and lock the valve member 40 back and forth between the open and closed position is significant enough that it will not be unlocked by merely nudging the dispensing assembly 10. However, the force required is also such that it can easily be operated manually.

(23) Because these containers are typically intended for one-time use and are discarded once the contents of such containers have been completely dispensed, it is preferable that the dispensing assembly for use in such systems be easy to manufacture, cost effective, quick to market and recyclable. It is also important that the components are of sufficient quality and robustness to sustain a repeated number of closing and opening cycles while maintaining a hermetic seal during the entire life cycle of the container.

(24) Accordingly, the construction of the components required to produce the slider valve dispensing assembly of the present invention is relatively simple and economical. All the components can be produced from commonly used and recyclable thermoplastic materials and formed using conventional plastic injection molding processes. For example, the cap member may preferably be made using medium density linear low density polyethylene (LLPE). The valve member may preferably be produced using a blend of 75% high density polyethylene (HDPE) and 25% LLPE. Finally, the outlet member may preferably be produced for example using HDPE or polypropylene (PP).

(25) From the foregoing description, it can be seen that the present invention comprises an improved slider valve dispensing assembly. It will be appreciated by those skilled in the art that obvious changes can be made to the embodiments described in the foregoing description without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but is intended to cover all obvious modifications thereof which are within the scope and the spirit of the invention as defined by the appended claims.