Patent Application
20140103034
This invention relates to liners used in conjunction with containers, and particularly to intermediate bulk container liners which are evacuated with the use of a suction pump.
Flexible liners are oftentimes utilized in conjunction with an intermediate bulk containers which are typically 42 to 48 inches is length, width and height, to ship large quantities of liquid, viscous or granular products. A problem long associated with the use of such liners has been the complete or near-complete evacuation of the contents from within the liner. As such, some liners have utilized pressurized regions to lift or angle the bottom of the liner or to move the interior sidewalls inwardly so as to move the contents closer to the outlet of the liner. While these devices have aided in the evacuation of the liner the can still result in rather large quantities of content remaining within the liner. This type of container also requires the use of additional pressurizing equipment to pressurize the inflatable regions.
Liners have also been designed with only a top fitment so that a vacuum hose head may be positioned within the top fitment to vacuum out the contents of the liner. A problem associated with this type of liner has been that as the contents are evacuated the liner material oftentimes folds and contacts another portion of the liner, thereby blocking the evacuation path. As such, an unacceptable amount of content material may again remain within the liner.
Accordingly, it is seen that a need remains for a liner that can more efficiently evacuate the contents, especially those used with intermediate bulk containers. It is to the provision of such therefore that the present invention is primarily directed.
A flexible liner for use with a container comprises a main body having a bottom wall, a top wall, and side walls extending between the bottom wall and the top wall. The bottom weal, top wall, and side walls having an interior surface and an exterior surface. The liner also has a weep plate mounted to the top wall interior surface. The weep plate has a fitment mounting opening therethrough and a field of protrusions depending downwardly from a base plate. The liner also has a hose fitment coupled to the weep plate fitment mounting opening. With this construction, the protrusions direct the flow of contents within the liner towards the fitment mounting opening during evacuation.
With reference next to the drawings, there is shown a liner 10 embodying principles of the invention in a preferred form. The liner 10 is configured to be used in conjunction with a container C, which is preferably in the form of a rigid intermediate bulk container but which may also be in the form of a flexible bag or a semi-rigid container.
The liner 10 has a liner body 11 with a bottom wall 13, a top wall 14 and four peripheral side walls 15 extending between the bottom wall and top wall so as to define a generally box shape configuration. The liner body 11 thus has an exterior surface 17 and an interior surface 18. The box shape can be described generally as a rectangular prism, although it should be understood that due to the nature of flexible materials the walls follow the shape of the container. Furthermore, flexibility of the plastic material enables the walls to collapse during dispensing without interference. The liner body may be made of a plastic sheet or film material such as a polyethylene film.
The liner 10 preferably also includes a rectangular weep plate 21 centrally mounted to the interior surface 18 of the top wall 14. The weep plate 21 includes a field of protrusions 22 which extend inwardly and downwardly from a generally planar base or base plate 23. The protrusions are arranged in a generally radial pattern, and are shown in the preferred embodiment as elongated, rounded ridges, as best shown in
A cylindrical, hose content inlet/outlet port or fitment 29, having a fitment cap 30, extends through the liner top wall 14 and weep plate fitment mounting opening 25 and is sealed thereto. A vacuum hose VH may be coupled to the fitment in fluid communication with the interior space of the liner, as described in more detail hereinafter.
The weep plate has a select width and length, along a horizontal plane, that is smaller that the select width and length of the liner top wall so as to define a margin or marginal space 32 of the top wall therebetween.
The liner may be constructed by forming a center band and then sealing end caps, which are the top and bottom walls, to the center band. The weep plate 21 is sealed to the interior surface of the end cap which forms the top wall.
In use, the contents to be stored within the liner, such as a liquid, powder, granules, etc., flow through the fitment 29 and into the initially folded and collapsed liner 10. As the content fills the liner 10 the liner gradually extends upwardly, due to the unfolding of the liner side walls and the increase in internal pressure caused by the inflow of material, until the liner is fully extended. Alternatively, the liner may be pre-inflated prior to the placement of materials therein. The fitment 29 is then sealed or closed with the fitment cap 30 and the liner and container C combination may be transported, as shown in
When it is desired to empty or evacuate the contents from the liner 10 the fitment cap 30 is removed and a suction or vacuum hose VH having an end or vacuum head H specifically designed to cooperate with the fitment 29 is inserted into the fitment so as to extend past the bottom of the fitment. Alternatively, the fitment may be designed to include a vacuum head which is already positioned within the interior of the liner so a vacuum pipe or conduit is simply coupled to the exterior top end of the fitment. The protrusions of the weep plate are sized so that the end of the vacuum head may be slightly lower than the protrusions to insure that the maximum amount of contents may be extracted.
The suction of the vacuum causes the contents to flow through the channels 24 between the protrusion towards the vacuum head while preventing the formation of a blockage by the top wall coming in direct contact with the bottom wall, as shown in
As the liner is depleted of contents it naturally collapses with the side walls crumpling or folding upon itself. As such the weep plate is made smaller than the cross-sectional area of the liner so that the crumpled material does not interfere with the lowering of the weep plate. In other words, the margin 42 between the weep plate and liner side walls allows for the weep plate to continue downward until it contacts or comes very close to the bottom wall 13 without the crumpled sidewalls interfering or blocking the downward movement of the weep plate.
As an additional feature, the liner 10 may include a press plate 40 shown in
As an option, the liner 10 may also include a semi-rigid bottom plate 50 which helps to maintain an unencumbered, fold free bottom layer to insure unencumbered flow therebetween for maximum flow through the protrusion channels 24. Preferably, the bottom plate 50 is mounted to the interior surface 18 of the bottom wall 13.
It should be understood that while the preferred embodiment is directed to a large liner, the invention may also be used in connection with small liners utilized within small containers, such as bag-in-box systems for distributing syrups and the like. Additionally, the liner and corresponding container may be in any conventional shape, such as a cube, cone, sphere, cylinder, pillow-shaped or partial portion thereof, and is not limited to the rectangular prism of the preferred embodiment.
It should be understood that inwardly extending grooves, valleys, or the like within a weep plate are considered to be an equivalent structure of the outwardly extending protrusions, since the areas which define such grooves should still be considered a protrusion as they are positioned relatively lower than or protruding from the upwardly extending groove.
It should also be understood that the liner to wall need not be an entire or continuous wall, as it could include a peripheral portion or margin sealed to the weep plate and extending to the side walls 15.
Lastly, it should be understood that the present invention is not limited to a device which is used in conjunction with only liquid materials.
It thus is seen that a liner is now provided which overcomes problems associated with liners of the prior art. While this invention has been described in detail with particular references to the preferred embodiments thereof, it should be understood that many modifications, additions and deletions, in addition to those expressly recited, may be made thereto without departure from the spirit and scope of the invention.
