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A container (2) for heating popcorn or other types of particulate food items in a microwave oven formed from a single blank having a bottom panel (4) coated with a microwave interactive material (26) adding heat to particulate food items such as popcorn kernels and configured so that each particulat

A container (2) for heating popcorn or other types of particulate food items in a microwave oven formed from a single blank having a bottom panel (4) coated with a microwave interactive material (26) adding heat to particulate food items such as popcorn kernels and configured so that each particulate food item placed into the container (2) for heating is spaced, on average, no more than the average diameter of one such food item away from the microwave interactive layer. The container is formed for shipping in a triangular wedge shape and for expansion to a trapezoidal box shape for use within a microwave oven for heating of the particulate food items.

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1. An expansible package for shipping and microwave popping of popcorn, comprising: (a) a predetermined quantity of popcorn kernels which will occupy a predictable volume when popped; (b) an expansible package containing said predetermined quantity of popcorn constructed for expansion from a col

1. An expansible package for shipping and microwave popping of popcorn, comprising: (a) a predetermined quantity of popcorn kernels which will occupy a predictable volume when popped; (b) an expansible package containing said predetermined quantity of popcorn constructed for expansion from a collapsed condition having a compact configuration for shipping to an expanded configuration having a predetermined internal volume at least equal to said predictable volume occupied by said popcorn kernels when popped, said expansible package having a wall adapted to rest in a generally flat horizontal configuration upon a horizontal support surface in a microwave oven, said flat wall having an interior surface that is large enough for said predetermined quantity of unpopped popcorn to be spread thereon in a generally unclumped and scattered manner with each kernel being generally spaced an average kernel's diameter away from said interior surface or less when said predetermined quantity of kernels is evenly spread over said interior surface; and (c) a microwave converting means integrally connected with said expansible package for converting microwave energy into heat for transfer in a sufficient amount to the popcorn kernels when scattered and unclumped to reduce substantially the number of burned or unpopped kernels that could result if the kernels were popped solely by direct impingement of microwave energy, said microwave converting means including a microwave interactive material whose temperature increases in response to impinging microwaves, said microwave interactive material being connected with said flat wall and co-extensive with an area of said interior surface which is sufficiently large to permit said predetermined quantity of popcorn to be spread in said unclumped and scattered manner to cause each kernel to be generally spaced an average kernel's diameter away or less from said microwave interactive material. 2. An expansible package as defined in claim 1, wherein said package includes a gussetted bag formed of paper and wherein said generally flat wall is a side wall of said bag. 3. An expansible package as defined by claim 2 wherein said microwave interactive material is applied to the interior surface of said side wall of said bag. 4. An expansible package as defined in claim 1, wherein said package is formed from a unitary blank including a bottom wall panel which forms said generally flat wall. 5. An expansible package as defined in claim 4, wherein said unitary blank is formed of microwave transmission material and said microwave interactive material is in the form of a layer which is mounted on and coextensive with said bottom wall panel. 6. An expansible package as defined in claim 5, wherein said microwave interactive layer and said bottom wall panel are flat rectangular and horizontal when in use to avoid clumping of the kernels. 7. An expansible package as defined in claim 6, wherein said unitary blank further includes (1) front and back wall panels foldably connected to a first pair of opposed parallel edges of said bottom wall panel, (2) a pair of side wall panels foldably connected to a second pair of opposed parallel edges of said bottom panel, and (3) a top wall panel foldably connected to the top edge of said back wall panel. 8. An expansible package as defined in claim 7, wherein said front, back and side wall panels are positioned generally perpendicularly to said bottom wall panel, said side wall panels being interconnected along their lateral edges to form an open topped carton. 9. An expansible package as defined in claim 8, wherein said side wall panels contain a pattern of fold lines which permit the package to be collapsed and expanded as the top edges of said front and back wall panels are moved toward and away from each other, whereby the package will assume a reduce volume triangular vertical cross sectional configuration for shipping when the package is collapsed and will assume an expanded volume quadrilateral vertical cross sectional configuration when the package is expanded for use within a microwave oven. 10. An expansible package as defined in claim 9, wherein said top wall panel may be removably secured to said front wall panel when the package is in its collapsed configuration. 11. An expansible package as defined in claim 9, wherein each said side wall panel includes a pair of sealing flaps foldably connected along opposed lateral edge portions of each side wall panel, said sealing flaps being secured to corresponding portions of the inside surface of said front and back wall panels. 12. An expansible package as defined in claim 11, wherein said sealing flaps are secured to said front and back wall panels in a manner to prevent leakage of cooking oil placed within the package. 13. An expansible package as defined in claim 7, wherein said unitary blank further includes a closing flap foldably connected with one of said top wall and front wall panels, said closing flap containing an aperture slit, and wherein the other of said top wall and front wall panels includes a key-shaped closing tab designed to fit into the aperture contained in said closing flap when said top panel is folded over to close the open top formed by the top edges of said wall panels. 14. An expansible package as defined in claim 7, wherein said top wall panel contains plural apertures for allowing gas to escape from the interior of said outer carton means when said top wall panel is in a closed position and the package is in its expanded configuration. 15. In an expansible package for shipping and microwave popping of popcorn comprising: (a) a predetermined quantity of popcorn kernels which will occupy a predictable volume when popped; (b) an expansible gussetted bag containing said predetermined quantity of popcorn constructed for expansion from a collapsed condition having a compact configuration for shipping to an expanded configuration having a predetermined internal volume at least equal to said predictable volume occupied by said popcorn kernels when popped, said expansible gussetted bag having a side wall adapted to rest in a generally flat horizontal configuration upon a horizontal support surface in a microwave oven, said side wall having an interior surface that is large enough for said predetermined quantity of unpopped popcorn to be spread thereon in a generally unclumped and scattered manner with each kernel being generally spaced an average kernel's diameter away from said interior surface or less when said predetermined quantity of kernels is evenly spread over said interior surface; and (c) a microwave converting means integrally connected with said expansible gussetted bag for converting microwave energy into heat for transfer in a sufficient amount to the popcorn kernels when scattered and unclumped to reduce substantially the number of burned or unpopped kernels that would result if the kernels were popped solely by direct impingement of microwave energy, said microwave converting means including a microwave interactive material whose temperature increases in response to impinging microwaves, said microwave interactive material being connected with said side wall and co-extensive with an area of said interior surface which is sufficiently large to permit said predetermined quantity of popcorn to be spread in said unclumped and scattered manner to cause each kernel to be generally spaced an average kernel's diameter away or less from said microwave interactive material. 16. A gussetted bag as defined in claim 15, wherein said bag is formed of paper and said microwave interactive material is formed of a metallized layer of plastic. 17. A gussetted bag as defined in claim 16, wherein said microwave interactive material is adhered to the interior surface of said side wall.