Reclosable container

The present invention relates generally to packaging and more specifically relates to an easy-to-use reclosable container.

In the container industry, specialized containers have been developed for specific applications. For example, in the food packaging industry, specific package types for cereals, frozen foods, dairy products, and other types of foods have specific packaging types that have come to be identified with the specific product. Many food products come in one-time use packages that are opened once and then discarded because there is no need for closure once the package has been opened.

For some food products, it is important to have a reusable package that can be repeatedly opened and closed. For example, a traditional cereal box is opened and closed many times over its useful life. Some reusable packages use close tabs or tacky adhesives to enable the package to be re-closed once it has been opened. Such closure mechanisms have drawbacks. For example, a tab generally sticks out from a panel and is easily deformed or ripped off, with a resulting decline or loss of effectiveness for closure. Adhesives areas may be soiled over time, resulting in reduced tackiness and, therefore, reduced closing ability. Further, previous closure types do not allow for the reliable creation of a seal when closing a package. A reliable seal is beneficial in several container applications, such as a microwave cooking application where the seal is necessary to hold in steam during cooking, or refrigeration or freezing applications in which air exchange between the container and the surrounding environment is unwelcome.

It is desirable to create a convenient container having an easy-to-use closing mechanism that overcomes these and other faults of previous containers.

According to one embodiment of the present invention, a container is provided with a closure flap attached to a container wall along a curved fold line.

According to another embodiment of the present invention, a container is provided with several curved fold lines, with one of the curved fold lines being a line of attachment between a container wall and a closure flap.

According to another embodiment of the present invention, a container is provided with a closure flap attached to a container wall along a curved fold line, such that a seal forms between the curved fold line and a container lid.

The above summary of the present invention is not intended to represent each embodiment, or every aspect, of the present invention. This is the purpose of the figures and the detailed description which follow.

The foregoing and other advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings.

FIG. 1 is an isometric view of a container according to one embodiment of the present invention;

FIG. 2 is an isometric view of a container according to one embodiment of the present invention

FIG. 3 is an isometric view of a container according to one embodiment of the invention,

FIG. 4 is an isometric view of a container according to another embodiment of the present invention; and

FIG. 5 is a plan view of a blank for manufacturing a container according to one embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

The creation of an easy-to-use container with a repeatable and reliable closure is a constant goal of the packaging industry. The present invention addresses this and other concerns of the packaging industry. A container 10 according to one embodiment of the present invention is shown in FIG. 1 . The container includes a base 12 and a lid 14 attached along a hinge fold line 16 to the base. The hinge fold line 16 is located along the top of a back panel 18 of the base.

The base 12 provides an enclosed volume bounded along the back by the back panel 18 , along the front by a front panel 20 , along the sides by first and second side panels 22 and 24 , and along the bottom by a bottom panel 26 . First and second front corner structures 28 and 30 provide for connection between the front panel 20 and the first and second side panels 22 and 24 , respectively, and first and second back corner structures 32 and 34 provide connections between the back panel 18 and the first and second side panels 22 and 24 , respectively. According to the embodiment shown in FIG. 1 , the corner structures include multiple plies of material adhesively attached in a gusset-like configuration, but it is to be understood that other corner structures, such as webbed corners, locked corners, and direct adhesive or staple connections between panels are also contemplated by the present invention. According to one embodiment of the present invention, the back panel 18 , the front panel 20 , and the first and second side panels 22 and 24 extend upwardly from the bottom panel and slightly outwardly from the center of the container 10 . According to one embodiment of the invention, the back panel 18 , the front panel 20 , and the first and second side panels 22 and 24 extend upwardly at an angle of approximately 100 degrees from the bottom panel 26 . According to another embodiment of the present invention, the back panel 18 , the front panel 20 , and the first and second side panels 22 and 24 extend upwardly at angles from about 90 degrees to about 120 degrees from the bottom panel 26 .

The first and second side panels 22 and 24 terminate along their tops at side panel top edges 36 and 38 . In the embodiment shown in FIG. 1 , the side panel top edges 36 and 38 are curved such that a slight outward bow is created in each of the first and second side panels 22 and 24 .

The front panel 20 terminates along an upper edge along a curved closure flap fold line 40 , with a closure flap 42 extending from the curved closure flap fold line 40 . According to one embodiment of the present invention, the curved closure flap fold line 40 is provided with several score cuts 44 such that the closure flap 42 tends to fold inwardly rather than outwardly.

As shown in FIG. 1 , the lid 14 includes a top panel 46 with first and second minor side flaps 48 and 50 and a minor front flap 52 . In the embodiment shown in FIG. 1 , the minor front flap 52 is attached to the top panel 46 along a curved minor front flap fold line 54 , which may be provided with several scored areas 56 to cause the minor front flap 52 to preferentially fold inwardly toward the inside of the container 10 . Similarly, the first and second minor side flaps 48 and 50 are respectively attached to the top panel 46 along first and second curved minor side flap fold lines 58 and 60 , which may likewise be provided with score areas 56 to allow the first and second minor side flaps 48 and 50 to preferentially fold inwardly.

The container 10 may be closed by folding the minor front flap 52 and the first and second minor side flaps 48 and 50 inwardly, then folding the lid 14 downwardly as shown by the arrow, “A.” This results in the configuration shown in FIG. 2 , in which the lid 14 is closed over the base 12 . Pushing the lid 14 into this position causes a slight outward bowing of the front panel 20 , along with a slight outward bowing of the curved closure flap fold line 40 . As a result, the closure flap 42 protrudes upwardly and slightly outwardly from the lid 14 .

At this point, the closure flap 42 may be folded in the direction shown by the arrow “B” in FIG. 2 into a closed position over the top panel 46 . The outward bowing of the front panel 20 and the curved closure flap fold line 40 cause a downward force on the closure flap 42 , holding the closure flap 42 in the closed position shown in FIG. 3 . When the closure flap 42 is in its closed position, the container 10 is tightly sealed against moisture escaping from the container 10 and further against air exchange between the container 10 and the surrounding atmosphere. The container 10 is not hermetically sealed at this point—it will allow some moisture and air to pass from the container 10 to the surrounding atmosphere—but the seal is sufficient for many applications, including food storage, refrigeration or freezing, and cooking in an oven or microwave oven, or both in a dual-ovenable configuration.

As shown in FIG. 3 , the closure flap 42 may be easily returned to an open position by folding the closure flap in the direction of the arrow “C.” In this manner, a container according to the present invention may be opened and closed several times for repeated use for food storage, preparation, and consumption. The closure flap 42 may optionally be provided with a tab 62 for insertion into a slot 64 located in the top panel 46 , as shown in FIG. 4 , to cause an even more secure closure—for use, for example, when the container 10 is expected to be jostled around excessively.

Turning now to FIG. 5 , a plan view of a blank 66 for forming a container 10 according to the present invention is shown. In addition to the panels and fold lines discussed above, FIG. 5 shows corner structure panels 66 and 68 , which form the first front corner structure 28 , corner structure panels 70 and 72 , which form the second front corner structure 30 , corner structure panels 74 and 76 , which form the first back corner structure 32 , and corner structure panels 78 and 80 , which form the second back corner structure 34 when the blank 66 is assembled into the container 10 .

According to one embodiment of the present invention, in forming the blank 66 into the container 10 , the corner structures are first formed by folding the respective pairs of corner structure panels toward each other, then adhering the resulting corner structures to their respective first and second side panels 22 and 24 . For example, the first front corner structure 28 is formed by folding the corner structure panels 66 and 68 toward each other, then folding the structure toward the first side panel 22 and adhering the structure to outside of the first side panel 22 . A similar procedure is followed for the remaining corner structures, resulting in sturdy corner structures which resist deformation when the container 10 is formed. It is to be understood that the corner structures could also be folded inwardly and attached to the insides of the side panels 22 and 24 , or that they could be folded either inwardly or outwardly and attached to either the inside or outside of the back and front panels 18 and 20 , or a combination of these methods could be used.

Once the corner structures are assembled, the base 12 of the container 10 has been given its basic structural form. Next, the first and second minor side flaps 48 and 50 and the minor front flap 52 are folded inwardly and the top panel 46 is folded downwardly over the base 12 . Finally, to close the package, the closure flap 42 is folded over the top panel 46 .

A container according to the present invention may be manufactured using a variety of methods and materials. One preferred material for manufacture of a container according to the present invention is paperboard coated with water-resistant polymer along one side. According to one embodiment of the present invention, a polymer coating is provided along the inside surfaces of the container. Further, using a container according to the present invention, it is possible to elevate the pressure inside the container above atmospheric pressure.

While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims.