Abstract: A stackable crate for transporting potted plants and the like includes opposing trays spaced apart by support structures. The trays form a top and bottom for the stackable crate. Each of the trays have side walls and end walls. The side walls are orthogonal to the end walls to thereby define four corners for the opposing trays. Each of the support structures has a plurality of upstanding panels which define interior and exterior walls for the stackable crate. Two of the upstanding panels are parallel and joined at their ends by one other upstanding panel of the plurality of upstanding panels so to form corners for the support structures. At least one of the corners so formed is an exterior corner for the stackable crate. The support structures are configured relative to the opposing trays such that each of the exterior corners are in substantial abutting alignment with each of the corners of the opposing trays to thereby form substantially closed ends and partially open sides for the stackable crate.

Abstract: A carton for shipping a computer is provided with an access panel in one of its sidewalls. The access panel is located adjacent to the power connector, network connector, and power switch for the computer. The access panel provides external access to the connectors and the switch when the computer is packaged inside the carton. The carton also has an intake flap and an exhaust flap in its other sidewalls. If the computer needs to be reconfigured or otherwise electronically accessed, the task may be performed without removing the computer from the carton. The access flap is opened so that power and network cables may be coupled to the computer connectors. One end of a ventilation hose is attached to the aperture formed by the intake flap and the other end of the hose is secured to an air compressor. When the computer is operational, the air compressor supplies compressed air through the hose to force ventilating air into the carton.

Abstract: A container for leaf product and other bulk pack materials wherein a first blank of paperboard is bonded to a second blank of paperboard. A field of bores are defined in at least one side wall of the container by a high-speed non-fluted drill for communication of moisture from the container to the atmosphere for drying and long term storage of the leaf products.

Abstract: Method for improved packing and cooling of produce by improving the flow of ventilation air to the produce, and apparatus to practice the method. According to the present invention, baskets for the packing of fruit are provided with ventilation channels disposed upon a lower surface of the basket. Vent apertures communicate between the ventilation channels and the produce stored in the baskets. After packing the baskets with produce, they are loaded into trays. The trays may be provided with tray vents which align with the ventilation channels. Alternatively, the trays may be formed without tray vents to improve some cooling regimes. In this manner, entire pallets of produce-filled baskets can be efficiently chilled by introducing a flow of cooling air into the baskets and thence through the produce packed inside.

Abstract: Method for improved packing and cooling of produce by improving the flow of ventilation air to the produce, and apparatus to practice the method. According to the present invention, baskets for the packing of fruit are provided with ventilation channels disposed upon a lower surface of the basket. Vent apertures communicate between the ventilation channels and the produce stored in the baskets. After packing the baskets with produce, they are loaded into trays. The trays may be provided with tray vents which align with the ventilation channels. Alternatively, the trays may be formed without tray vents to improve some cooling regimes. In this manner, entire pallets of produce-filled baskets can be efficiently chilled by introducing a flow of cooling air into the baskets and thence through the produce packed inside.

Abstract: A packaged product comprising a plurality of individual containers, a corrugated board or paperboard carrier wall disposed along a portion of the periphery and shrink wrapping. The shrink wrap film has vent holes that are specifically sized and spaced apart as needed to provide adequate venting of one or more volatiles out of the shrinkwrapped multi-pack to prevent package staining and/or discoloration of the package's printing inks. The container wall preferably has an open top and bottom and also has two free edges spaced from each other so as to leave a portion of the periphery uncovered by the wall.

Abstract: A container embodiment helping to protect freshly baked pizza pie and the like against extremely disgruntled delivery drivers while in a totally unsupervised environment. The container embodiment having tamper-resistant ventilation to enhance the overall effectiveness of a supplemental tamper-resistant securing means which is added just before the delivery process begins. The tamper-resistant ventilation prevents contaminates from being easily injected through the ventilation by a contaminate delivery means without leaving evidence of the contaminates on an inner surface area of the container embodiment.

Abstract: The invention relates to a ventilated case, specifically designed for fruit and vegetable products, of the type made of corrugated cardboard or other like material, comprising a case body defining therein a holding space delimited by a bottom, two longitudinal sides and two transversal and opposite heads. The main feature of the invention is that each of the two heads is provided with at least two beveled or rounded corners, and that the longitudinal sides coupling the heads are provided with at least a perforated portion, slanted with respect to the vertical line or having a curved profile.

Abstract: Packaging and method for transporting one or more gas generators. The gas generator is separated and insulated from walls of a sub-compartment. Side walls of the sub-compartment have apertures for passing heat and gas from the sub-compartment for dissipation thereof within a container in which the sub-compartment is contained. Passages are allowed in the container during closing thereof for release of heat and gas thereof.

Abstract: A container formed from a blank to define indexing longer walls having an inward incline but a double thickness provided by a foldline at the tops thereof so that the indexing projections are receivable within corresponding openings in the base of a corresponding container. Each part of the indexing walls has an extension such that at each end thereof one extension attaches to the outside of an end wall while the other attaches to the inside of an end wall with preferably that attaching to the inside of an end wall through a pair of parallel vertical folds providing a support at least in part for the weight of a stacked container.

Abstract: A plurality of tabs extend from three edges of each head of a pair of heads for penetrably engaging respective ones of a plurality of slots disposed along opposed edges of a wrap to form an asparagus box. The pair of heads and wrap are formed from corrugated plastic sheet material and the wall segments present in opposed overhangs of each tab engage opposed triangular elements disposed at opposed ends of each slot to restrain the tab but accommodate disassembly and reassembly. A tray receives and supports the open end of the asparagus box to form a container and includes a plurality of slots for receiving tabs protruding from the wrap of an adjacent stacked container to stabilize stacking of the containers.

Abstract: A dome shaped crown for a clamshell container is formed by two sets of sidewalls having different shapes. A narrow space is provided between adjacent pairs of sidewalls, the spaces permitting venting of warm, moist air due to the presence of a heated sandwich packaged in the container. The container is formed from a unitary blank of paperboard. In one embodiment, the crown is dome shaped and the lower tray is provided with straight walls. In the second embodiment, both the crown and the lower tray have sidewalls of different slopes. Any type of releasable latch between the two halves may be employed.

Abstract: Ventilation panels for boxes and cartons and methods and apparatus for manufacturing those panels at production levels. The ventilation panels include a pest barring, gas transmitting screen trapped between two segments of the material from which the panel is made.

Abstract: A package and a method are disclosed for preserving freshness of produce using a corrugated fiberboard composed of an outer liner having a carbon dioxide permeability coefficient Pco.sub.2 of greater than 5.times.10.sup.-10 cm.sup.3 (STP)cm/cm.sup.2 .multidot.s.multidot.cmHg at a temperature of 27.degree. C.; a corrugating medium; and an inner liner having a water-vapor transmission rate of less than 100 g/m.sup.2 .multidot.day at a temperature of 27.degree. C. The end parts of the corrugated fiber board which are exposed to an outer surface of the package are substantially sealed with a seal tape. A wrapping paper covered at least on one surface thereof with a resin layer which contains therein less than 0.917 g/cm.sup.3 density of a copolymer of ethylene and .alpha.-olefin having a carbon number of 3 to 12, having a carbon dioxide permeability coefficient of greater than 8.times.10.sup.-10 cm.sup.3 (STP)cm/cm.sup.2 .multidot.s.multidot.cmHg, a permeability coefficient ratio Pco.sub.2 /Po.sub.

Abstract: A pizza box includes a bottom wall; a peripheral side wall attached to a periphery of the bottom wall; a top cover including a rear edge hingedly attached to the side wall, a front edge, two side edges between the front edge and the rear edge, two slits in the top cover, each slit extending from a front edge, side edge or corner to an inner point of the top cover and each slit formed by a first slit section which is offset from a second slit section thereof, a first fold line interconnecting the inner points of the top cover to form a lift flap between the first fold line and the two slits, two second fold lines extending from the first fold line toward the rear edge, the top cover being bent along the first and second fold lines such that the first fold line defines a highest position of the top cover with the remainder of the cover sloping down therefrom toward the edges of the cover, and a vent opening which is always open is formed along each of the slits; and a rear connecting panel which connects the to

Abstract: A type of box comprising at least five walls yet with the capability of having the appearance of a square box, with a convertible corner feature that allows conversion of a diagonal wall to a square corner for carrying extra items, and with sloping side walls that allow multiple blanks to be inverted and mated for material savings. Also disclosed is a method for partially folding and nesting the box for conserving storage space used for set up boxes and a method for expanding and contracting the size of the inner cavity of the box.

Abstract: A container for shipping and displaying articles is formed from a continuous, foldable sheet of corrugated boxboard to form a container body having a bottom, enclosing end and side walls attached with and extending generally normal from the bottom and a partially enclosed top panel opposite the bottom and adjacent each end wall with a substantial portion of the top being open. The container is filled with articles to be shipped and displayed and a netting member having an open weave is stretched across the open portion of the top and between the panels, with opposing ends of the netting member fixed to the sides of the container body with a header sheet adhesively fixed to the container sides and with an advertising message printed on the outside of the header sheet. Interlocking stacking tabs and handle recesses are provided for use with multiple containers of the same construction.

Abstract: A container for storing and shipping produce made from a blank having top, bottom and side panels with apertures therein defining cut-out areas allowing the passage of vapor through the container, at least some of the apertures overlapping the top and side panels and/or the bottom and side panels, wherein the cut-outs area of the apertures in the top and bottom panels exceeds the cut-out area of the apertures in the side panels.

Abstract: A light-weight, reusable plastic corn container uses a locking lid tab to hold the corn in a tight bundle, augmenting the strength of the container despite large water access ports used for hydrocooling. A multiple section lid and staggered lid locking slots permit the container to tightly hold different volumes of corn and to expand to contain comparable numbers of ears as the growing season progresses.

Abstract: This invention relates to the design, construction and use of lined or coated corrugated paperboard package systems (e.g. boxes, cartons) for prolonging the storage life of fresh fruits and vegetables under modified atmospheres (MA) in the headspaces of the closed package systems. The plastic-paperboard construction comprises a first layer of polymeric film, a second layer of kraft paper adjacent the first layer, a kraft paper corrugated flute adjacent the second layer and a fourth layer of kraft paper adjacent the flute.

Abstract: Refrigerated dough packaging has a pressure release valve associated with a flange to substantially prevent the expanding dough from interfering with the gas venting abilities of the packaging.

Abstract: A stackable, open top, paperboard, produce tray for holding and transporting articles that require considerable venting, The tray has side and end walls joined to and extending upwardly from side and end edges of a bottom wall, and the end wall are provided with aligned vent openings that accommodate the passage of air through the tray in a direction longitudinally of the tray to maximize the venting of articles in the tray. Also, the side walls of the tray are provide with internal cavities adapted to receive portions of star wire stacking wires.

Abstract: A shipping and display box is provided that has stacking holes in a bottom wall and stacking tabs protruding above a top wall for being received in stacking holes of a second shipping and display box stacked on top of the shipping and display box to prevent relative movement of the stacked boxes and to align the stacked boxes and facilitate drainage of water from the second shipping and display box into lower shipping and display boxes. Drain holes are formed proximate edges of the bottom wall of the shipping and display box, and diverter tabs are formed in side walls. The holes formed proximate the edges of the bottom wall facilitate drainage of water from an upper stacked box into holes formed by the diverter tabs in the side walls of lower stacked boxes.

Abstract: An improved container for storing and transporting a hot pizza product that includes a top and bottom with nonzero Gauss curvatured structures over a major portion of the supporting surface so that less material need be used for fabrication without a lowering of structural integrity. The top and bottom members are adapted to nest with other like tops and bottom members to reduce the need storage space near the pizza oven where they are ready for use without preassembly. The floor of the bottom comprises upstanding projections with small top surface area to reduce the heat conduction path and to support the product above the floor to form an air insulating space between the product and the floor. The bottom member includes a sidewall that intersects the floor to form a supporting line when resting on a supporting surface, thermal conduction being limited to such line. The curved, convex shape of the floor then provides a closed air insulating space between the bottom and the resting surface.

Abstract: A plastic openwork receptacle and a plastic openwork cover therefor, the receptacle and cover having plastic hinge interconnection, the receptacle having an upper rectangular ledge, facing upwardly, and the cover having a lower rectangular ledge facing downwardly, in closed connection, the upper and lower ledges sized to register upon closing of the cover over the receptacle. Each of the ledges has two laterally spaced longitudinally elongated first sections, and two longitudinally spaced laterally extending second sections, each first section being about twice the length of each second section.

Abstract: A shipping and display box is provided that has stacking holes in a bottom wall and stacking tabs protruding above a top wall for being received in stacking holes of a second shipping and display box stacked on top of the shipping and display box to prevent relative movement of the stacked boxes and to align the stacked boxes and facilitate drainage of water from the second shipping and display box into lower shipping and display boxes. Drain holes are formed proximate edges of the bottom wall of the shipping and display box, and diverter tabs are formed in side walls. The holes formed proximate the edge of the bottom wall facilitate drainage of water from an upper stacked box into holes formed by the diverter tabs in the side walls of lower stacked boxes.

Abstract: A convertible container for the storage, transportation, dispensing and utilization of air freshening products includes an elongate tubular box having opposed sidewalls and normally closed ends for the retention of the products. At least one of the sidewalls has a tear-out portion adjacent its corner end for access to the interior for dispensing the product. The sidewalls also have perforated lines extending transversely so that the upper portion of the box may be removed and, in conjunction with generally transversely extending fold lines, the remainder of the box can be converted to a wall mounted dispenser.

Abstract: A cover arrangement for a tank used as a terrarium or aquarium includes hook and loop fastener material secured as a continuous strip to the upper rim surface of the tank opening, as well as to the upper side surfaces adjacent to the rim. The cover includes a mesh portion to enclose the tank opening, and a frame dimensioned to be secured to the rim of the tank. The frame includes a continuous strip of hook and loop material secured about the perimeter of the mesh portion and disposed to engage the hook and loop material on the upper rim of the tank. In addition, a plurality of tabs extend from the frame, one for each side of the tank. Each tab includes hook and loop material, and is joined to the cover frame along a respective crease line to be folded and matingly engaged at the upper side surfaces adjacent to the rim.

Abstract: A venting/opening means for an ovenable carton having a separate lid with venting and opening instructions printed on one corner, and a tray with a continuous peripheral flange. The improvement wherein the venting/opening means is applied to each corner of the tray flange for polygonal shaped cartons having side walls of equal length, or to designated diagonally opposed corners of trays of rectangular shape so as to provide a venting/opening means under the printed instructions on the lid notwithstanding how the lid is oriented on the tray. The venting/opening means takes the form of partial depth cut lines, cut score lines or the like arranged diagonally across the corners of the tray flange. These cut lines provide corner tabs which may be separated from the tray flange to allow the tray to be opened by fracturing the portion of the tray flange outboard of the cut lines and first partially lifting the lid to vent the carton, and then finally opening the carton by lifting the lid completely off the tray.

Abstract: A stackable berry container comprises a bottom wall, a pair of opposing side walls, and first and second opposing end walls. Each of the first and second end walls forms a respective set of small vents spaced along the lengths of the end walls adjacent the bottom wall. Each of the first and second end walls further forms a respective large opening above the respective set of small vents. Each of the first and second end walls includes a bowed inner panel and an outer panel hingedly connected to each other along a rigid convex-shaped ledge. Each of the side walls including an inner panel and an outer panel hingedly connected to each other along an upper transverse edge. A first pair of minor flaps extends from opposing ends of the inner panel of one of the side walls and a second pair of minor flaps extends from opposing ends of the inner panel of the other of the side walls.

Abstract: A method for preserving and displaying fresh mushrooms is provided which minimizes air flow, moisture penetration and mushroom shrink. The container method includes disposing fresh mushrooms in a container which has a plurality of ventilation openings and a cover. The container is transparent to provide an upscale and attractive display and to allow a consumer to see the container's contents.

Abstract: A pizza container having raised bottom wall portions for air circulation underneath a pizza. This allows single-face corrugated inserts to be eliminated for cost savings. A two-piece pizza container has lid tabs hingedly joined to the lid along respective hinge lines recessed inwardly from the respective lid edges, each tab being folded along a fold line which lies generally along the respective lid edge to define an insertion portion to be received in a cut-out in a base side wall between inner and outer portions of the side wall and a portion between the insertion portion and the hinge line which is movable to effect lifting and lowering movement of the insertion portion for more easily attaching the lid and with the height of the cut-out being reduced for more effective attachment. The base has outwardly sloping side walls, and the "spring" effect of the insertion portion against the respective outer side wall portion is provided to resist downward forces on the lid to thereby protect pizza in the box.

Abstract: A package for heated carry-out food such as pizza pie, includes a box structure made up of side walls, a bottom panel and a closure lid. The side walls and the bottom panel define an interior compartment which is suitable for holding the heated food. A steam permeable support member, such as a sheet of balsa wood, is positioned within the interior compartment for supporting the heated food. The wooden support member allows for the passage of steam away from the heated food. The support member is elevated above the bottom surface of the box so that any condensing water from within the wooden support member is encouraged to collect below the support member and away from the heated food. Means for elevating the support member is included.

Abstract: A container with an improved closure system and other improved features made of a single-faced paperboard blank formed of a corrugated paperboard layer and a substantially flat paperboard layer. The blank has scored lines or cuts which define a bottom portion, a cover, a cover support and four side walls. The boundaries of the side walls are defined by a plurality of substantially parallel scores and cuts that meet at a plurality of points so as to form side walls which have generally triangular ends. The improved closure system comprises at least one locking tab integrally formed in the cover and which has a plurality of flutes and at least one locking receptacle integrally formed in the bottom portion and which has an edge. Each corresponding receptacle and tab positionally coincide when the container is assembled so that a flute of the locking tab engages the flat paperboard layer by the edge of the receptacle to facilitate a closure.

Abstract: A one-piece carton formable into an enclosed container and suited to retain consumable contents therein. The carton blank is cut and scored to include a bottom wall panel, four side wall panels integral with the bottom wall panel along four side fold lines and foldable along the side fold lines to form container sides. Integral connections, which are foldable and sealable to form leak tight sealed integral corners, are provided between adjacent side wall panels. A lid wall panel is integral with a side wall panel and foldable inward toward the bottom wall panel. Cuts in the lid wall panel define a vent access section which can be manually removed from the lid wall panel along a predetermined vent separation path as a result of a manual venting procedure. The vent access section includes a grippable portion extending from an edge of the lid wall panel.

Abstract: A carton is provided for holding wet books and like materials during transport to and processing at a freezing and freeze drying or vacuum drying facility. The carton is fabricated as a laminated corrugated carton from a high density polymer that may be stored in a flat condition, assembled to hold the books or like and after their processing collapsed for storage. The carton have openings throughout to facilitate extraction of fluids. The cartons are reusable as many as 20 times or more.

Abstract: Three generic methods for selectively fumigating fruit. The methods include: (a) open-box selective fumigation; (b) closed-box selective fumigation; and (c) open-top selective fumigation using an existing picking lug. Also included are three embodiments of a solid-wall, wood fiber fumigation box (10, 18, 30) used to practice the first two methods, and a fumigation facility (32) having an improved fumigation chamber (40) useful in practicing all three methods.

Abstract: A biodegradable container baked from a waffle material is composed of a pair of half shells each of which has a pair of lugs for flaps engaging in recesses of the other half shell and formed with ribs along generatrices of the respective side wall having detent recesses engageable by bulges or beads of the recesses of the other half shell. Additional ribs can be provided for stiffening purposes. The container is useful for foods distributed at fast-food restaurants or the like.

Abstract: Vacuum-sealed container, including contents and having an upper part and an element integral with the upper part, a housing being defined by the upper part and by the element, containing a solid substance having a melting point between 65.degree. and 150.degree. and including a first orifice communicating with the container and a second orifice communicating with the exterior closed by the solid substance.

Abstract: A safety carton for pizza or the like is provided which consists of a rear wall that is hinged for connecting bottom and top panels together. The bottom and top panels each having rounded corners. Two opposed side walls and a fold over front wall are connected to and extend upwardly from the bottom panel. A pair of rear diagonal corner walls and a pair of front diagonal corner walls are each connected at one end to each side wall. A closure structure is connected thereto for selectively maintaining the top panel in a closed position.

Abstract: A container in the form of a six-sided enclosure having opposing top and bottom walls, opposing side wall inner panels which are hingedly connected to opposing edges of the bottom wall, and opposing end walls formed from a corrugated or solid fibreboard blank. A pair of flaps are hingedly connected to opposing sides of each of the end walls and are adapted to overlie an adjacent side wall inner panel. A pair of side wall outer panels are hingedly connected to opposing edges of the top wall and each is adapted to overlie the flaps which overlie the adjacent side wall inner panel.

Abstract: A pan (10) is formed from a single blank (12) of plastic-coated paperboard and is foldable between a three-dimensional, erect condition and a flat condition. In the flat condition, first and second isosceles trapezoid-shaped side panels (20) are folded about the side edges (18) of a bottom panel (14) to overlie the bottom panel (14) and with their upper edges (22) abutting. Additionally, in the flat condition, first and second triangular panels (34) are folded about the side edges (32) of end panels (28) to overlie the end panels (28). The end panels (28) are in the shape of isosceles trapezoids and are integrally connected to the opposite end edges (16) of the bottom panel (14) and extend continuously therefrom in the flat condition. Attachment panels (38) are foldable about the outer edges (36) of the triangular panels (34) and are secured to the side panels (20) with the side edges (24) of the side panels (20) abutting with and being foldable with the outer edges (36) of the triangular panels (34).

Abstract: A food package including a closed carton containing a food product, the closed carton including a carton tray and a carton closure.

Abstract: An asparagus carton and a unitary blank for forming it. The blank is of corrugated paperboard. The carton interior is tapered along opposite side walls by virtue of slanting side spacer panels. This yields a trapezoidal configuration of a part of the carton interior to more nearly correspond to the tapered form of a mass of asparagus. The carton is preferably loaded from the bottom. The asparagus may be inspected by opening a side wall panel, and may also be opened from the top. In addition to providing slanting side walls, the side spacer panels permit the loaded carton to be lifted through side wall openings without contacting the asparagus. In a first embodiment, the bottom of the carton may be opened by releasing a bottom tongue and slot latch arrangement, while in a second embodiment the bottom of the carton is defined by known interlocking panels.

Abstract: A fresh produce packing assembly and method for storing and transporting fresh produce. The produce packing assembly includes a hollow container having a liquid collection volume therein defined by a liquid impervious device and a passageway providing for liquid communication between the interior and exterior of the container. Produce pieces are positioned in the container and liquid, usually water, is added to the container for retention in contact with a portion of the produce positioned in the collection volume. The produce packing method includes the steps of placing produce pieces within a package having a liquid collection volume, closing the package to secure the pieces inside, introducing a liquid into the package for accumulation within the collection volume, and draining any liquid exceeding the amount retained by the collection volume from the interior of the container through the passageway.

Abstract: A container for ripening of fruit during storage and shipment has a first portion defining vertically oriented first side surfaces and a second portion defining vertically oriented second side surfaces, the planes of the first side surfaces being offset from planes of the second side surfaces. The container is adapted to be stacked in a pallet load with other of the containers, with adjacent first side surfaces of adjacent containers in engagement for stable stacking of the containers, and adjacent second side surfaces of adjacent containers spaced apart in a manner to define a channel between the adjacent containers for circulation of ventilating air or gas to fruit contained within the containers and for removal of heat generated by respiration of the fruit.

Abstract: A container for a flat food product is formed from a one-piece blank to provide a multisided container having a front panel, first and second opposing side panels, third and fourth opposing side panels, first and second perforated portions interconnecting said first and third opposing side panels and said second and fourth opposing side panels, respectively, a rear panel, and a top. The six-sided design provides less air space in the container, thus contributing to the maintenance of the temperature of the food product contained therein. Lock tabs located on minor flaps of the front panel secure the first and second opposing side panels into an upright position by interlocking under portions of the side panels. The perforated portions provide continuity between the side panels, and automatically provide hot air ventilation outlets when the container is assembled.

Abstract: A carton comprising a cover structure formed from a cut and scored flat blank of carton material. The cover structure includes a top wall having a plurality of side walls extending therefrom along a straight common fold line therebetween within a plane defining an interior included angle with the top wall of less than 180.degree.. The cover structure includes a plurality of over center toggle action tabs having indicia operatively associated with each tab. Each over center toggle action tab is defined by cuts and edge lines formed in the top and side walls so as to contain a predetermined length of the common fold line therebetween which divides the tab into two tab sections. The cuts enable the peripheral edge portion of the tab defined thereby to move toward and away from the adjacent cut top and side walls while the peripheral edge portions of the tab defined by said edge lines hinge with respect to the adjacent top and side walls.

Abstract: The present invention provides packaging capable of room-temperature storage of foods followed by simplified microwave heating. The package also permits heating in conventional ovens. The package includes a multi-ply container portion having a central recess surrounded by a sealing rim to which is heat sealed a lid which is flexible and non-extensible and has good barrier proporties. The inner surface of the container is amorphous polyethylene terephthalate to assure good heat sealing. The out ply of the container is crystallizable to provide sufficient dimensional stability during heating. The package can be retorted and vents itself when microwave heated, thus simplifying storage and preparation of foods.

Abstract: A venting/opening means for an ovenable carton having a separate lid with venting and opening instructions printed on one corner, and a tray with a continuous peripheral flange. The improvement wherein the venting/opening means is applied to each corner of the tray flange for polygonal shaped cartons having side walls of equal length, or to designated diagonally opposed corners of trays of rectangular shape so as to provide a venting/opening means under the printed instructions on the lid notwithstanding how the lid is oriented on the tray. The venting/opening means takes the form of partial depth cut lines, cut score lines or the like arranged diagonally across the corners of the tray flange. These cut lines provide corner tabs which may be separated from the tray flange to allow the tray to be opened by fracturing the portion of the tray flange outboard of the cut lines and first partially lifting the lid to vent the carton, and then finally opening the carton by lifting the lid completely off the tray.