Food package containing a reclosable means

Abstract: This invention pertains to a reclosable package having a body member 18, a base 12, a hermetic seal between the body member and base and snap locking projections 24, 26 in the side walls of the body member and base, which can be constructed to provide an audible snap upon closure.

Description: This invention is concerned with a food package having a base, a body member, a peeling seal for hermetically sealing the base to the cover and snap-locking means contained in the base and cover for reclosing the package after it has been opened in providing an audible snap as the package is reclosed. Food packages have been described in the past. For example, EP-A-0222558 discloses a food package according to the pre-characterising part of claim 1 comprising a base member having a peripheral flange, a side wall and a raised panel portion; a body member having a peripheral flange, the body member cooperating with the base member to form a cavity to receive a food product, with said body member having a depending side wall engaging the base member side wall in telescoping arrangement, and the body member having a top panel; peelable sealing means to provide hermetic sealing of the base member peripheral flange to the body member peripheral flange after the food product is filled into the cavity; and locking means contained within the peelable sealing means in the base member side wall and in the body member side wall for snap locking the base member to the body member, having been formed after the cavity has been formed, filled and sealed. In US-A-3498018 a food package is described wherein the food is sealed inside the package having a body and top member. The food is formed under vacuum and with mechanical pressure thereby forming the food to the package and is hermetically sealed. These types of packages and methods for forming are further described in US-A-4411122; US-A-4577757; and US-A-688,369. Attempts to improve these patents are further described in US-A-4498588 and US-A-4498589. Various improvements are described, for instance in US-A-4498588, ridges 34, grooves 36, and fig. 3 are described in an attempt to provide a interlocking engagement. These elements, however, have not proven to be satisfactory in producing a suitable audible snap in reclosing the package. Other means of incorporating snap actions into packages are described in U.S. Patents 3,672,536 and 3,734,276. It is submitted that these two patents, however, do not describe packages wherein the packaged foods are formed to the package with vacuum and mechanical pressure. Thus, there remains in the art a need for a package that is easily openable and also recloses in a positive manner in providing an audible sound signifying to the consumer that the package has been reclosed, particularly with packages where the food is pressed to conform to the container. According to the invention there is provided a food package comprising: (a) a thermoformed base member having a peripheral flange, a side wall and a raised panel portion; (b) a thermoformed body member having a peripheral flange, said body member cooperating with the base member to form a cavity to receive a food product, with said body member having a depending side wall engaging said base member side wall in telescoping arrangement, and said body member having a top panel; (c) peelable sealing means to provide hermetic sealing of the base member peripheral flange to the body member peripheral flange after the food product is filled into the cavity; and (d) locking means contained within the peelable sealing means in the base member side wall and in the body member side wall for snap locking the base member to the body member, having been formed after said cavity has been formed, filled and sealed; characterised in that said locking means is comprised of a plurality of locking projections which are formed by crimping, which are at least 1/16 of an inch (at least 1.59 mm) in height, which are spaced from each other, which are positioned both (a) in said base member side wall and in said body member side wall and (b) in said base member flange and in said body member flange and which project in a direction away from said food product cavity and generally perpendicular to said body member depending side wall to provide for a friction interference fit, said locking means further including a sidewall of both of said locking projections in the body member side wall and in the base member side wall, said sidewalls of said locking projections each having a crease which is generally parallel to said peripheral flanges and which is positioned substantially midway along said height of the locking projection, said sidewalls of said locking projections being pairs of sidewalls formed simultaneously in both the body member and the base member to provide sidewall pairs which matingly interengage one another for audibly snap locking the base member to the body member; and that an adhesive is applied generally around the periphery of the cavity and through said locking projections thereby providing an adhesive pattern which conforms to the shape of the locking projections. Non-limiting embodiments are now described by way of example only, in the accompanying drawings, wherein: Figure 1 is a perspective view of a package according to the present invention, Figure 2 is a side view of the package, Figure 3 and Figure 4 are segments of the package, Figure 5 is a perspective view of a bias package, and Figures 6, 7, 8, 9 and 10 are a front view, rear view, side view, top view and bottom view respectively of the Figure 5 package. SUMMARY OF THE INVENTION This invention pertains to a food package having a base member with a peripheral flange, a side wall and a raised panel portion. A body member is also provided having a peripheral flange, a side wall and a top panel. Said body member cooperates with the base member to form a cavity to receive a food product when said base side wall engages said body member side wall in telescoping arrangement of the package so that the food may be compressed. Suitable packaged foods include but are not limited to sliced luncheon meats and cheeses. A peelable sealing means is also provided to hermetically seal the body member flange to the base flange. A snap-locking means is also provided in the base side wall and in the body member side wall to provide an audible snap-locking action when the base engages the body member. U.S. Patents 3,498,018; 4,411,122; 4,577,757; and 4,688,369 describe a method of forming a vacuumized, hermetically sealed package, as shown in the figures, characterized by a pre-determined quantity of a product which is deformable and is arranged in a form of an upright mass on a raised panel (10) portion of a base member (12). The base member has a side wall (13) and peripheral flange (14), hermetically sealed to a corresponding peripheral flange (16) of a body member (18). Preferably, the body member is made of a semi-ridged, pre-formed plastic. The body member has a top panel (20) for engaging the upper end of the product and a depending side wall (22) for engaging the side walls of said product. The top panel is joined to said side wall by a hinge forming portion (24). The bottom edges of the body member side wall are in telescoping relation with the portion of the base at the peripheral edges of said raised panel portion. To fill the package, the body member is placed in an inverted position and a sufficient quantity of product is placed in said body member to substantially fill the body member when the package is completed. The base member is positioned on the mouth of the body member so that the product panel disposes in a telescopic way into the body member and engages the product. The flange margins of the base member overlay the corresponding margins of the body member. Mechanical pressure is applied inwardly on the outside surface of the raised panel portion. The area defined by the bottom edges of the body side walls is sufficient to force the product into close contact with the interior surfaces of the base and body members to shape the product to conform to the shape of the interior surface and to substantially completely fill the space available between the same and product while vacuumizing the assembly and the sealing of the package by hermetic means. According to the present invention, projections (26) in the base sidewall and in the body member sidewall are formed. The projections may consist of a number of shapes such as a partial circle, and are 1/16 of an inch (1.59 mm) or more, 1/8 of an inch (3.18 mm) preferred and 1/4 of an inch (6.35 mm) more preferred in height. Projections (26) are formed by crimping after filling and sealing of the package. Post-thermoforming crimping of the projections cause an audible snap when the body member and base are pressed together. A glue pattern, of adhesive (28) is applied, progresses around the periphery of the package and conforms to the shape of the tab projections. A minimum of one tab projection and as many as eight or more projections may be formed to achieve a desired reclosable locking action. Other embodiments to assist reclosing are a permanent glue or a heat seal along the base in a score line adjacent to a bottom glue line to function as a hinge. A hinge may also be provided by adhering tape to the base (12) and bubble flange (16) at either package end. Thermoform matching lugs might be provided on the side walls of the base and body member to enhance resealing after the package is opened. When this invention is employed, reclosability and the ability to stay closed is achieved at a low cost by providing one or more points of friction interaction within the sealed area of the package. An audible snap sound is also provided which enhances the perception of freshness preservation once the package is opened. This invention can be applied to round, square or other shaped packages. Also, the projections are visible to the consumer and a pleasing appearance is obtained. To achieve an easy opening, high molecular weight polymer adhesives which are peelable/resealable may be used or easy peel multi-layer rigid films that are heat sealable may be used. Accordingly, features of this invention are thermoforming projections in the body member and base that are part of the side walls that friction fit through a pinching action (top to bottom) with a post thermoforming gripping action when the base and body member are pressed together. An audible reclosability of the package base and body member is achieved within the sealed area of the package. Crimping of projections may occur from the side and occurs after the package is filled and sealed. Crimping may also occur at room temperature or heat may be applied to the surface of a crimped area and/or imparted by a crimping device. In one embodiment of this invention, as shown in the Figures, an example of 5 projections which are a semi-circle is shown. The thickness of the body member is approximately 13 mil. (0.33 mm) and the thickness of the base is approximately 12 mil. (0.30 mm). The body members composition may be Barex 210 (a polyacrylonitrile film), PET (polyethylene terephthalate) or PVC (polyvinyl chloride). The base composition suitably is Barex 210 (a polyacrylonitrile film), PVC, saranex (a polyethylene-saran coextrusion film) laminated to Barex 210 (a polyacrylonitrile film), PVC (polyvinyl chloride), or polystyrene.

Claims: A food package comprising: (a) a thermoformed base member (12) having a peripheral flange (14), a side wall (13) and a raised panel portion (10); (b) a thermoformed body member (18) having a peripheral flange (16), said body member cooperating with the base member (12) to form a cavity to receive a food product, with said body member (18) having a depending side wall (22) engaging said base member side wall in telescoping arrangement, and said body member (18) having a top panel (20); (c) peelable sealing means to provide hermetic sealing of the base member peripheral flange (14) to the body member peripheral flange (16) after the food product is filled into the cavity; and (d) locking means contained within the peelable sealing means in the base member side wall (13) and in the body member side wall (24) for snap locking the base member (12) to the body member (18), having been formed after said cavity has been formed, filled and sealed; characterised in that said locking means is comprised of a plurality of locking projections (26) which are formed by crimping, which are at least 1/16 of an inch (at least 1.59 mm) in height, which are spaced from each other, which are positioned both (a) in said base member side wall (13) and in said body member side wall (22) and (b) in said base member flange (14) and in said body member flange (16) and which project in a direction away from said food product cavity and generally perpendicular to said body member depending side wall (22) to provide for a friction interference fit, said locking means further including a sidewall of both of said locking projections (26) in the body member side wall (22) and in the base member side wall (13), said sidewalls of said locking projections (26) each having a crease which is generally parallel to said peripheral flanges and which is positioned substantially mid-way along said height of the locking projection (26), said sidewalls of said locking projections (26) being pairs of sidewalls formed simultaneously in both the body member (18) and the base member (12) to provide sidewall pairs which matingly interengage one another for audibly snap locking the base member (12) to the body member (18); and that an adhesive is applied generally around the periphery of the cavity and through said locking projections (26) thereby providing an adhesive pattern (28) which conforms to the shape of the locking projections (26). A package according to claim 1, characterised in that it further includes hinge means (24) for securing respective ends of the base member (12) and the body member (18) together.

Inventors: HUSTAD GERALD ORTON, HUSTAD, GERALD ORTON
Applicants: MAYER OSKAR FOODS, OSCAR MAYER FOODS CORPORATION
Application year: 1989
Main classification: B65D75
IPC codes: B65D43, B29C65