AU2004212611A1 - Flexible plastic container - Google Patents

Description

P/00/011 Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Invention Title: Flexible plastic container The following statement is a full description of this invention, including the best method of performing it known to us: Freehills Carter Smith Beadle Sydney\004718008 Printed 21 September 2004 (14:05) 004716971v5 FLEXIBLE PLASTIC CONTAINER RELATED APPLICATIONS This application is related to U.S. Nonprovisional Patent application Serial No.

10/037,295, filed December 21, 2001, which claims priority from United States Provisional Patent application Serial No. 60/332463 filed on November 9, 2001, both of which are incorporated herein by reference and made a part hereof. At the date of filing this application, the specifications of both these related applications are available from the United States Patent and Trademark Office website, www.uspto.gov, using the search functions provided on that website.

TECHNICAL FIELD The present invention relates generally to a flexible plastic container and more particularly to a flexible container for directing a flowable material contained therein to a fitment of the container and dispensing the flowable material.

BACKGROUND OF THE INVENTION Collapsible plastic bags are often used to store liquid products such as chemicals, soft drink syrup, fruit juices and food condiments. The plastic bags are typically housed in a corrugated paperboard box to aid in the transporting, handling and dispensing of the product. Such packaging systems are commonly referred to as "bag-in-box" packaging systems.

The plastic bags typically have sidewalls sealed along a peripheral seam to define a fluid containing chamber. A spout or a fitment provides access to the fluid chamber for filling and dispensing the product within the bag. Vacuum pump systems are sometimes connected to the container to assist in draining fluid from the container.

Both gravity dispensing bags and vacuum pump systems suffer from the common drawback that fluid may become trapped within the folds of the bag during draining.

Because of this, evacuation channels are often placed within the bag. Evacuation channels are typically elongate cylindrical tubes or flat strips with protruding ribs defining grooves. Typically, one end of the evacuation channel is disposed transverse to, or is connected to the spout, and the other end of the evacuation channel extends 004716971v5 3 into the fluid containing chamber of the bag. As the bag is emptied by the force of the vacuum pump, or by the force of gravity, portions of the bag collapse unevenly, tending to leave pockets of product, typically liquid, which may become isolated from the rest of the liquid in the container. The evacuation channel, however, forms a conduit which cannot be closed off by the folds created in the bag. In this manner the entire chamber of the flexible bag remains in communication with the spout at all times during the dispensing such that all product within the bag can be removed.

Prior attempts to provide such bags are disclosed in U.S. Patent Nos.

4,601,410; 5,647,511 and 5,749,493. United States Patent Nos. 4,601,410 and 5,647,511 disclose a liquid container with an evacuation unit. In both the '410 and '511 patents, the evacuation unit is shown attached directly to the spout by a mounting ring. Several problems have been encountered with these types of evacuation units.

For example, during the filling process, which is typically done in a high speed and high pressure process, the evacuation unit is susceptible of being dislodged from the spout thereby rendering the evacuation unit inoperative. Also, the attaching ring can impede the flow of liquid during the filling process thereby slowing the filling process.

United States Patent No. 5,749,493 discloses an evacuation unit positioned within a bag and transverse and perpendicular to a spout in the bag. Because the evacuation unit is positioned in a location that is in line with the incoming fluid during the filling process, it is susceptible of being dislodged from its mounting to the container thereby rendering it ineffective. The '493 Patent also discloses extruding a pair of ribs or a single rib or protuberance extending the length of the container.

Many of the designs which utilize an evacuation unit positioned within the bag require that the unit be placed into the bag after the bag has been substantially constructed. This is highly undesirable because it adds another step to the manufacturing process and increases the labor costs.

United States Patent No. Re. 34,929 discloses a plastic bag having interconnected air channels on its inner surface for the vacuum packaging of perishable items. The air channels are formed by the spaces between a plurality of raised protuberances having uniform thickness and formed in a generally regular and waffle-like pattern. The protuberances prevent the total collapse of the bag during air evacuation. There is no disclosure to utilize a fitment to provide access to the contents 004716971v5 4 of the container. There is also no disclosure of removing the stored contents of the bag, but, rather only removing air from the package to prevent spoilage of the perishable item contained therein.

United States Patent No. 2,778,171 discloses the production of airtight packages for packaging perishable items such as food. Projections are provided near an opening of the airtight package for keeping sidewalls of the container from fully collapsing against one another while air is being evacuated from the container. There is no disclosure of evacuating a stored product from the container and no disclosure of providing a fitment with the bag to provide access to the stored contents.

United States Patent No. 5,728,086 discloses a flexible container having multiple access ports and particularly discloses a container for storing fluids for parenteral administration to a patient. An inner surface of a sidewall of the container can have various patterns embossed thereon to assist in draining the contents of the container.

SUMMARY OF THE INVENTION Broadly, the present invention relates to a flexible container comprising a chamber having an inner surface. A dispenser is incorporated into the container and establishes fluid communication between the chamber and a location outside the chamber. A pattern of raised protrusions is on the inner surface of the chamber. The protrusions enable a flowable material contained in the chamber to flow to the dispenser when the dispenser is activated.

In particular, the present invention provides a flexible polymeric container for storing and dispensing liquids. The container has a first sidewall and a second sidewall connected together to define a fluid chamber therebetween. The first sidewall and the second sidewall each have an inner surface facing the fluid chamber and an opposed outer surface. The container also has a dispenser that establishes fluid communication between the fluid chamber and a location outside the fluid chamber. A plurality of objects are positioned on the inner surface of at least one of the first sidewall or the second sidewall to define a plurality of pathways having at least a first pathway and a second pathway intersecting one another. The plurality of pathways are of a depth of a range of greater than 1 mil to less than 8 mils.

004716971v5 The present invention further provides a flexible polymeric container for storing and dispensing liquids. The container has a first sidewall and a second sidewall connected together to define a fluid chamber therebetween, the first sidewall and the second sidewall each having an inner surface facing the fluid chamber and an opposed outer surface and an access member for accessing the fluid chamber. A plurality of a first set of objects having a first shape is positioned on the inner surface of one of the first sidewall or the second sidewall. A plurality of a second set of objects having a second shape different from the first shape is positioned on the inner surface of one of the first sidewall or the second sidewall.

The present invention further provides a method for evacuating a fluid from a container. The method includes the steps of: providing a liquid filled container having a sidewall having an inner surface and an outer surface, providing a plurality of objects on the inner surface of the sidewall to define a plurality of pathways having at least a first channel and a second channel intersecting one another wherein the plurality of pathways are of a depth of a range of greater than 1 mil to less than 8 mils; providing a fitment having an opening therethrough having an axis substantially perpendicular to the outer surface; and applying a suction to the fitment to draw fluid from the container.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a container having a fitment; Fig. 2 is a side view of the container of Fig. 1; Fig. 3 is a sidewall of the container of Fig. 1 having objects having varying shapes; Fig. 4 is a sidewall of the container of Fig. 1 having a plurality of regularly spaced rectangular protuberances to define a checkerboard pattern; and Fig. 5 is a sidewall having circular protuberances together forming a circular pattern with a series of X-shaped protuberances forming S-shaped lines.

DETAILED DESCRIPTION While this invention is susceptible of embodiment in many different forms, herein will be described in detail with the accompanying figures, a preferred 004716971v5 6 embodiment of the invention. The present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiments illustrated and described.

Figures 1 and 2 show a flexible container assembly 10 having a first sidewall 12 and a second sidewall 13 attached at peripheral edges 14 to define a fluid tight chamber 16. A spout 18 is attached to an outer surface of the sidewall 12 and provides fluid flow access to the chamber 16. In a preferred form of the invention, the first and second sidewalls 12 and 13 are a flexible polymeric material having a modulus of elasticity of less than 50,000 psi. The sidewalls preferably are made from materials such as homopolymers and copolymers of polyolefins, polyamides, polyesters or other material that are capable of being sealed using industry standard sealing techniques.

These techniques include, but are not limited to, heat sealing, radio frequency welding, and ultrasonic sealing. The sidewalls may be multilayered or single layered and may be fabricated from any suitable polymer processing technology including extrusion, coextrusion, extrusion lamination, lamination or other. The container can be made from individual sheets placed in registration and sealed along the periphery 14 or can be made from a blown film process where only opposing ends of a tube need be sealed to complete the container Figure 3 shows a plurality of objects 20 on the sidewall 12. The objects 20 can be positioned on a single sidewall or both. The objects, in a preferred form of the invention, are provided over an entire surface of the sidewall but could be provided only in select areas of the surface. Providing objects over the entire sidewall surface eliminates the need for registration of the sidewalls. Moreover, providing objects over the entire surface ensures that fluid is evacuated from all parts of the container, including corner regions. The objects can be of any shape including regular shapes such as circular, polygonal, straight or curved lines, symbols or the like. The objects can also be irregular shaped. These objects 20 assist in draining fluid from the chamber 16. The objects 20 can be raised protuberances or indentations in these shapes. The objects can be all of the same shapes or be of a combination of shapes.

The objects can be of varying sizes provided the objects are effective to provide fluid pathways through the container when the fluid or particulate contents of container is being evacuated.

00471697v5 7 The objects 20 on the sidewall 12 provides an advantage over prior art containers having an evacuation unit positioned within and attached to an inside surface of the container. The evacuation unit is typically made from a polymer material, and is heat sealed or welded to the inside of the container. The weld area, in such containers, contacts the contents of the container. The weld area may have an undesired organoleptic effect on the container contents. Providing objects directly on the sidewall as disclosed herein eliminates any organoleptic residue arising from heat sealing the evacuation unit in the container. Moreover, the evacuation unit is typically a rigid member. The present invention eliminates the rigid member resulting in a bag having a thinner profile, thereby reducing shipping and storage volume. Also, the rigid member type evacuation unit is not entirely effective in evacuating fluid from corners of the container. The present invention removes fluid that would otherwise remain in the corners.

The objects 20 can form a regular pattern or an irregular pattern. The regular pattern includes objects being placed at the same or essentially the same spacing or a repeating sequence of spacings. The irregular pattern is one where the objects are generally randomly distributed.

In a preferred form of the invention as shown in Figure 4, a regularly spaced pattern of rectangular-shaped objects 30 has pathways 32 defined therebetween. This checkerboard pattern has at least a first pathway 33 intersecting a second pathway 34.

In a preferred form of the invention the pathways intersect at substantially perpendicular angles to one another. However, it is contemplated the intersection of pathways 32 can form various angles without departing from the present invention.

Figure 5 shows another preferred form of the invention having a series of circular protuberances 40 together with X-shaped protuberances 44. The circular protuberances 40 define a circular shape 42. The X-shaped protuberances 44 define a S-shaped pattern 46. Of course it is contemplated that any combination of shapes of protuberances can be used and that more than two different shapes can be used. The present invention further contemplates that the individual protuberances can form varying indicia such as a trademark, tradename, logo, instructions for use or other identifying or useful information or advertising that can be viewed through the sidewall 12 or 14 or both.

004716971v5 8 The objects can be formed on the inner surface of sidewall 12 or sidewall 14 or both by techniques well known in the art including embossing during the fabrication of the sidewall, or embossing afterwards. The pattern can also be applied by an extrusion coating process or similar process. The objects can be pressed into the sidewalls with a shaped die. Numerous other mechanisms and processes come to mind for forming the objects which are well known in the art and the present invention should not be limited to these processes recited. The pathways 32 and 33 of the pattern are preferably of a depth of greater than or equal to 1 mil, or less than 8 mils, and even more preferably less than 5 mils. Most preferably, the pathways 32 and 33 will have a depth of from about Imil to about 4 mils for fluids having the viscosity of a soft drink syrup. For fluids having a greater viscosity a greater depth will be necessary to provide adequate flow of the fluid through the pathways to evacuate the fluid from the container assembly.

The fitment 18 has an opening 50 having an axis essentially perpendicular to a panel surface of sidewall 12 of the container. It is contemplated the fitment 18 can be mounted at various angles to the sidewall without departing from the present invention. The fitment 18 provides fluid access to the contents of the chamber 16.

Typically, container 10 is used for housing liquids such as soft drink syrup which are withdrawn from the container with a hose and mixed at a fountain with a diluent such as soda water. The hose (not shown) has an attachment for connecting to the fitment in a fluid and airtight arrangement. A vacuum is applied to the fitment 18 through the hose to withdraw fluid from the container. The vacuum creates a pressure difference to initiate a fluid flow. Of course, the fitment 18 may be attached to the first or second sidewall 12, 13 or both and may be located at any location thereon.

The present invention further provides a process for evacuating the container shown in Figure 1. The method for evacuating a fluid from a container comprises the steps of: providing a liquid filled container having a sidewall having an inner surface; providing a plurality of objects on the inner surface of the sidewall to define a plurality of channels having at least a first channel and a second channel intersecting one another wherein the plurality of pathways are of a depth of a range of greater than 1 mil to less than 8 mils; providing a fitment having an opening therethrough having an axis substantially perpendicular to the outer surface; and (4) 004716971v5 9 applying a suction to the fitment to draw fluid from the container.

While the specific embodiments have been described, numerous modifications come to mind without significantly departing from the spirit of the invention and the scope of protection is only limited by the scope of the accompanying claims. This design is just one example of a pattern design having these favorable characteristics, and disclosure of it is merely one example of a design having its favorable characteristics, others of which are not significant departures from the spirit of the invention.

Reference to any prior art in the specification is not, and should not be taken as, an acknowledgment, or any form of suggestion, that this prior art forms part of the common general knowledge in Australia or any other jurisdiction or that this prior art could reasonably be expected to be ascertained, understood and regarded as relevant by a person skilled in the art.

Claims (15)

1. A flexible polymeric container for storing and dispensing liquids comprising: a first sidewall and a second sidewall connected together to define a fluid chamber therebetween, the first sidewall and the second sidewall each having an inner surface facing the fluid chamber and an opposed outer surface; a dispenser that establishes fluid communication between the fluid chamber and a location outside the fluid chamber; and a plurality of objects on the inner surface of at least one of the first sidewall or the second sidewall to define a pattern of a plurality of pathways having at least a first pathway and a second pathway intersecting one another, wherein the plurality of pathways are of a depth of a range of greater than 1 mil to less than 8 mils.

2. The container of claim 1 wherein the pattern is generally a checkerboard pattern.

3. The container of claim 1 wherein the pattern is defined by a series of spaced protuberances.

4. The container of claim 3 wherein the protuberances have a generally circular shape.

The container of claim 3 wherein the protuberances have a polygonal shape.

6. The container of claim 3 wherein the protuberances have an irregular shape.

7. The container of claim 3 wherein the protuberances have a first set of 004716971v5 11 protuberances with a first shape and a second set of protuberances with a second shape different from the first shape.

8. The container of claim 3 wherein the protuberances are generally S- shaped.

9. The container of claim 8 wherein the S-shaped protuberances extend from a first end of the container to a second end of the container.

10. The container of any one of the preceding claims wherein the pattern extends over an entire surface of the first sidewall or the second sidewall.

11. The container of any one of the preceding claims wherein the pattern extends over the inner surfaces of both the first and second sidewalls.

12. The container of any one of the preceding claims wherein the plurality of pathways are of a depth of a range of greater than 1 mil to less than 5 mils.

13. The container of any one of the preceding claims wherein the plurality of pathways are of a depth of a range of greater than 1 mil to 4 mils.

14. The container of any one of the preceding claims wherein the container does not impart organoleptic properties to the stored liquids.

15. A flexible polymeric container for storing and dispensing liquids substantially as described herein with reference to any one of the figures.