Disposable storage container

The invention is directed to a single use disposable storage container and a lid therefor. The container includes a base and lid. The base includes a generally inverted U-shape rim for mating with the lid to secure the lid to the container base. The container lid includes a composite of paper and plastic. The plastic portion of the lid generally includes an inverted U-shape ring for mating with the base and securing the lid to the base. The plastic ring includes a peripheral ledge and seat extending from an inner side wall of the ring. The paper center panel is secured to the peripheral ledge and seat.

FIELD OF INVENTION

The present invention relates to disposable storage containers and lids therefor. More particularly, the invention is directed to disposable storage containers for food and the like which include a composite lid of plastic and paper.

BACKGROUND OF THE INVENTION

Storage containers include an open top base for storage and a lid to close the base. The lid and base mate to define the closure and seal. Lightweight, disposable storage containers are known in the art.

In considering container design, price and value, and sometimes price alone, often drive the container design; the materials used; and the ultimate construction and performance of storage containers. There are often tradeoffs in the quality of the container design and the intended use of the container. Additionally, the increased cost of resin has made container design important to optimize the use of resin while concurrently providing a quality container.

Many types of storage containers are available in the marketplace, including for food storage and the like. These, containers generally fall under several categories, including (1) single use or disposable containers made of plastic or paper; (2) semi-durable containers which are disposable after a few uses; and (3) durable containers manufactured for multiple uses.

The present invention is directed to single use disposable storage containers. Most containers of this type are made of paper or plastic. When made of plastic, the plastic adds to the weight and to the cost of the container based on the price of resin. Often such containers are reused and not thrown away, in part because the container still looks new and does not suggest that it is disposable. In such instances, however, the containers designed for single use may fail and affect the freshness or other attributes of the materials stored. This may cause dissatisfaction by the consumer who has purchased the single use disposable container because it is less expensive, but then uses the container similar to a semi-durable container.

Containers having a lid of plastic and fiberboard are also generally known in the art. However, for the most part, these containers are complex, expensive to manufacture and not for single use disposable storage containers.

Container lids may also include the brand name of the storage container or decoration. With plastic containers, the product name or decoration is subject to the mold design. Accordingly, it may be difficult and/or expensive to change the container name or decoration due to the need to change the mold design.

Accordingly, there is a need in the market for a single use disposable storage container which is light-weight, attractive, and allows for the easy and inexpensive change of graphics or decoration on the lid.

SUMMARY OF INVENTION

The present invention is directed to single use disposable storage containers and lids therefor. The invention is directed to a single use container having a lid and a base. The lid is comprised of a composite of a plastic and paper. The plastic portion of the lid includes an outer ring for sealing the container and a center panel of paper. The center paper panel provides multiple advantages including reducing the weight of the container; reducing the cost of the container by use of less resin; by using less resin in the lid the lid is environmentally-friendly; by having a paper center panel the container suggests disposability of the container to the consumer so that the container is not reused thereby precluding consumer dissatisfaction if the container is reused and fails; and the paper center panel allows for different graphics and decorations and provides for the interchangeability of the graphics and decorations on the center panel.

The single use disposable storage container of the invention comprises a base and a lid. The container may be of multiple geometries and a preferred geometry is rectangular or square. The base generally includes side walls, a bottom and an open top for receiving and removing the material to be stored. The base includes a generally inverted U-shaped rim for mating with the lid to secure the lid to the container base. The container lid comprises a composite of paper and plastic. The plastic portion of the lid generally comprises an inverted U-shaped ring for mating with the base and securing the lid to the base. The plastic ring includes a peripheral ledge and seat extending from an inner side wall of the ring. The paper center panel in terms of overall size comprises a majority of the lid. The paper center panel is secured to the peripheral ledge and seat. In one preferred embodiment of the invention, the base and lid ring are injection molded from a plastic material. The paper center panel is thereafter adhered to the plastic lid by heat-sealing or bonding.

The different embodiments of the invention will be apparent from the following description of the preferred embodiments of the invention and from the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The container10of the invention comprises a lid12and base14. The lid12comprises a plastic ring16and a center panel18made of paper. While the container10is generally shown in the drawings as rectangular, it is understood that other container geometries may be used with the invention including square, round, oval or the like.

A primary novel feature of the invention is providing a lid made of at least two different single use and disposable materials, namely plastic and paper. The lid includes ring16which comprises an inverted U-shape closure20having top wall22, inner side wall24and outer side wall26. Side walls24and26include ridges28and30, respectively, for engaging the rim of base14for closure of the container. The ring further includes a ledge32spanning the circumference of ring16and having a seat34for receiving center paper panel18. Ledge32includes corners36wherein at least one corner38has a different shape, in a preferred embodiment this corner is an angled shape for mating with a corresponding portion of panel18as discussed hereafter. The lid further includes a gripping tab40for opening and closing the container.

Panel18is made of paper designed for single use and to be disposable. Panel18includes corners50wherein at least one of corner52has a different shape, in a preferred embodiment the corner52is angled and mates with corner38of ring16. This allows for proper insertion and sealing of panel18to ring16such that the graphics and/or decoration on the lid are in the correct orientation. Panel18further includes a coating19on the underside of the panel. If the panel is to be attached to ring16by bonding, the underside of the panel is provided with a bonding coating in at least an area sufficient to provide adhesion of panel18to ledge32and seat34. Coatings which provide a suitable adhesive strength based on its use as described herein will be determinable by one skilled in the art. The coating further is preferably selected to protect the underside of the paper panel from the contents of the container by providing a moisture-resistant surface to the underside of the panel. The protective coating can be used when heat bonding the panel to the ring or the coating can be the same or a separate material from the adhesive coating (when used) which adheres panel18to ledge32. In terms of overall size of lid12, paper panel18comprises a majority of the overall size dimensions of the lid.

The container base14includes side walls60, bottom wall62, open top64and an inverted U-shaped lip66. The inverted U-shaped lip66includes top wall70, inner side wall72and outer side wall74which are generally constructed to mate with top and side walls22,24, and26of lid12. Lip66includes grooves68and4469for receiving ridges28and30of lid12to seal and close the container. Lip66further includes one or more ridges76on outer wall74over which ridge30will move when closing the container to provide an audible noise to indicate closure of the container to the consumer.

The center panel18may include different graphics such as the brand name of the container and/or decoration. These can be in a single or multiple colors. As previously stated, the graphics and/or decoration may appear best when oriented in relation to the gripping tab40. Such orientation is assured by use of a different shape of the corner in the ring16and the panel18, i.e. corners38and52. Paper panel18provides for the easy and inexpensive substitution of different designed panels18depending on consumer preference. For example, panels18may be decorated for different seasons of the year to illustrate sunshine or warmth in the summer months and snowflakes or the like during the winter months. Additionally, the panel lid decoration may be illustrated for specific occasions such as the Christmas season or the 4th of July.

The container ring and container base are made of a disposable plastic. A preferred plastic is polypropylene. However, other plastics such as polyethylene, polystyrene or polyethylene terephthalate may be used. Preferably, the container ring and base are made of the same plastic, although they may be made of different plastics, e.g. the container base may be made of polyethylene and the container lid ring may be made of polypropylene. The container lid and base are made by known molding processes, such as injection molding. When manufacturing the container lid, the ring16is first injection molded with the plastic, e.g. polypropylene, and then the paper panel18is added thereto and secured by heat-sealing and/or known bonding techniques. During this process, the panel18is adhered to the ring16at seat34of ledge32.

The exemplary embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention. The exemplary embodiments were chosen and described in order to explain the principles of the present invention so that others skilled in the art may practice the invention. As will be apparent to one skilled in the art, various modifications can be made within the scope of the aforesaid description. Such modifications being within the ability of one skilled in the art form a part of the present invention and are embraced by the appended claims.