Abstract: A construction for heating food in a microwave oven is provided. The construction includes an outer receptacle and a moisture barrier closure enclosed within the outer receptacle. Food material to be heated is enclosed within the moisture barrier closure, during storage. Preferred arrangements include an outer receptacle which is expandable to accommodate expansion of the food material, preferably popcorn, upon heating. In a preferred construction shown, a microwave susceptor construction is positioned within the moisture barrier closure.

Abstract: A thin walled, easily crushable container with an integral or seamed-on bottom is filled with an edible material which requires sterilization. The empty container has one end attached or integral that may have a concave slope relative to the inside of the container. A liquified or solidified inert gas is then inserted into the container. The container is then sealed with a concave shaped end before the inert liquified or solidified gas has completely vaporized. The ends are such that they do not bulge under the pressure left after sterilization, which pressure is due to the pressurization effect of the inert gas and which pressure is enough to overcome the vacuum caused by the cooling of hot water vapor or steam above the edible material and gives the can the required rigidity.

Abstract: A bag suitable for use in microwave cooking is constructed of an elongated tube of flexible material closed at one end by a cold seal closure and having a heat seal adhesive deposit applied to the other end thereof for use in closing the bag after filling thereof.

Abstract: A collapsible canteen formed by a collapsible carton having nested therein a collapsible pouch whose open mouth is in alignment with a neck projecting from the carton. The collapsible canteen which has a charge of powder deposited in the pouch is adapted to produce, in situ, a beverage when a hot or cold liquid is poured through the neck of the canteen into the pouch to dissolve the powder the nature of which determines that of the beverage.

Abstract: A capsule package which contains roast and ground coffee for preparation of a coffee beverage has body and membrane components. The body has a base portion capable of allowing flow of a coffee beverage therethrough, an annular sidewall portion which extends transversely from the base about a package body interior space and defines an opening which opposes the base portion, and a rim portion which extends about the opening and transversely from the sidewall portion in a direction away from the opening.

Abstract: A collapsible canteen having deposited therein a charge of water-soluble flavor crystals such that when the canteen is erected and water is poured therein, the crystals are then dissolved to produce, in situ, a soft drink. The canteen includes square top and bottom walls, the top wall having a projecting neck to receive a removable cap. Also included are a first pair of opposing side walls that are inwardly foldable in half whereby when the canteen is collapsed, the folded in first side walls are then sandwiched between the top and bottom walls, and a second pair of opposing side walls that are outwardly foldable in half and are each provided with a triangular gusset that is joined to a side wall in the first pair of side walls, whereby when the canteen is collapsed, the gussets are then folded into the folded out second pair of side walls to define a pair of outstretched wings, the wings being then folded under the bottom wall to create a square-shaped pack.

Abstract: A method of filling and sealing a package with a product wherein a container having a bottom generally deformable in shape is filled with a product having a volume less than the container volume but equal to the filled volume. A continuous top lid is placed onto the container and positioned adjacent to a sealing surface and rim section of the container. In this position enough headspace exists to permit the proper lid placement without squeezing product onto the seal surface. The filled container supported on an anvil and lid are then transferred into a vacuum chamber within the vacuum chamber and with a sealing head disposed above the anvil in the raised position, the pressure within the chamber is evacuated by a vacuum. This process lowers the pressure of the headspace gas from the container to that of the chamber. When the desired vacuum level is achieved, the sealing head is lowered and the lid is sealed to the sealing surface of the container.

Abstract: The present invention is directed to packaging methods for preserving a comestible, and for extending the shelf-life thereof, while simultaneously providing a freshly baked and locally packaged appearance. The package includes a retractable panel located at an inconspicuous place on the package which panel is pressed inwardly by atmospheric pressure, after the essentially inert modified atmosphere within the package has been partially absorbed by the comestible contained there within.

Abstract: A flexible, sealable container apparatus having a substantially pinch-bottomed configuration prior to expansion of the bag during cooking. The container apparatus includes substantially quadrilateral regions of adhesive. The shape and positioning of the quadrilateral regions, with diagonals substantially collinear to panel edges of the container apparatus, serves to articulate the container apparatus into a substantially rectangular-bottomed configuration during cooking, while improving the integrity of the bottom region seals against blowout and/or leakage.

Abstract: Alcoholic extracts of particulate solids for food or drink, and particularly of coffee grounds, are prepared in a squeezable plastics container which has a fabric filter disc across its outlet to trap the soaked grounds when the liquor extract is dispensed. A pull-off seal or cap is provided to close the container until needed. In use, liquid can be sucked back into the container by squeezing and releasing it, and used to wash a further extract from the solids.

Abstract: An expandable collapsed bag, preferably made of paper, suitable for cooking corn in a microwave oven. The bag of the invention has front and back panels and two side panels, each side panel having two or more gussets. These gussets permit relatively free upward movement of the corn and fuller expansion of the bag during cooking. In its collapsed configuration, the back panel is folded to expose a portion of each side panel that forms one gussets. The collapsed bag thereby forms strips extending along each side edge in which the bag is four layers thick. Since a conventionally folded, two gusseted bag has six layers along its edges, the reverse folded bag is thinner and, therefore, advantageous from handling, shipping and storage viewpoints.

Abstract: An oral medication delivery system and method for pharmaceutically active agents having local and/or systemic effect is provided. The system provides three embodiments of containers in which medication is stably stored, either in liquid suspension or in dry powder form with a delivery liquid, until dispensed for use by a patient. The medication is mixed as required and frozen in the storage container until hard, when it is administered to the patient in the form of a frozen popsicle. One embodiment of the system includes a flexible plastic container which contains the pharmaceutically active agent mixed with a delivery liquid. In other embodiments the medication in powder form and a delivery liquid are stored in a chambered container separated by a rupturable membrane which is ruptured to mix the container contents prior to freezing.

Abstract: A method of filling and sealing a package with a product wherein a container having a bottom generally deformable in shape is filled with a product having a volume less than the container volume but equal to the filled volume. A continuous top lid is placed onto the container and positioned adjacent to a sealing surface and rim section of the container. In this position enough headspace exists to permit the proper lid placement without squeezing product onto the seal surface. The filled container supported on an anvil and lid are then transferred into a vacuum chamber within the vacuum chamber and with a sealing head disposed above the anvil in the raised position, the pressure within the chamber is evacuated by a vacuum. This process lowers the pressure of the headspace gas from the container to that of the chamber. When the desired vacuum level is achieved, the sealing head is lowered and the lid is sealed to the sealing surface of the container.

Abstract: A dispensing display container of coffee or other spoonable particulate foodstuff comprises an upper, externally threaded cylinder and an internally threaded sleeve that the user discards when empty.

Abstract: A collapsible, thin wall, plastic container includes a closed end, an annular peripheral side wall and an open end, the peripheral side wall including a plurality of annular steps or shoulders for enabling controlled axial collapse of the container to a compact, collapsed condition wherein a plurality of substantially concentric folds surround a remaining uncollapsed portion of the container; and a removable cap securable to the open end, the cap having a sealed chamber formed therein for holding a predetermined amount of foodstuff material.

Abstract: A collapsible container is disclosed having a top portion and a base portion joined by a generally cylindrical side wall structure, the generally cylindrical side wall structure has a central axis and a collapsible helical portion and the collapsible helical portion has a generally uniform radius and a generally flat side cross sectional shape with respect to the central axis. A cup section is also disclosed which can cause deformation of the collapsible container's side wall. The container is particularly suitable to store carbonated beverages and other consumer products.

Abstract: A storage shield provides a removable cover for placement on the surface of frozen ice cream remaining in an opened container, thereby partially sealing the surface of the ice cream from the air-filled voids. The shield, in one embodiment of the invention, is especially adapted for use in a conventional one-half gallon size, box-shaped ice cream carton. The shield is made from a transparent synthetic resin material, thus making it possible for the user to see any remaining air pockets through the shield. The shield, in this embodiment, is a rectangular-shaped planar device with smooth top, bottom, and sidewall surfaces. The corners of the shield are rounded slightly so that the shield can be easily inserted into the partially filled ice cream container with the bottom shield surface being slightly pressed to flatten the exposed surface of the ice cream. The ice cream is thereby partially protected from exposure to the air within the container and thereby deterioration is retarded.

Abstract: The present invention is directed to a process for producing a marine oil preparation, in the form of an oil-in-water emulsion, with the viscosity of mayonnaise, containing 22 to 90% by weight of cod-liver oil or other marine oils, or concentrates of such oils, where the emulsion is filled into containers made of an air-resistant material and which follows closely the contents during and after dosage so that no air space arises and therefore no oxidation of the preparation occurs. The production process occurs preferably under an inert gas atmosphere.

Abstract: A container apparatus for use in filling, storing, shipping and cooking various types of food wherein the container apparatus facilitates and maintains the positioning of the food in a substantially restricted predetermined location within the apparatus. The container apparatus includes a bag having a front and back panel, a first and second gusseted side panel and an interior region. Bag panel attachment elements are positioned between a portion of the back panel means and an adjacent portion of the gusseted side panels preliminarily to filling, so as to maintain the back flaps of the gusseted side panels against the back panel during such filling, as well as during storing, shipping and cooking of the food. The bag panel attachment elements further serve to operably segregate and maintain the food in a predetermined portion of the interior region so that the food does not inadvertently migrate between the gussets and the back panel during filling.

Abstract: The present invention provides an insulating microwave heating package with a multiplicity of latent, uninflated or potential insulation chambers capable of inflating when exposed to microwave energy. The package includes at least two superimposed inner and outer pieces of flexible sheet material bonded together at selected points, patches or along seal lines separated by unsealed areas which define side-by-side unfilled, i.e., potential, inflation chambers between the lines, patches or points. Upon exposure to microwave energy, the package and its contents become heated. As a result of this heating process, the unfilled chambers also become heated, causing them to become filled with hot expanding air or moisture vapor. These chambers serve as insulation for the package and enhance heating of the food by reducing heat loss from the package.

Abstract: In a popcorn package for microwave popping, the subsequent popping of popcorn by microwave energy is enhanced by the use of a layer of metallized ink printed on the bag of a popcorn package. The metallized ink contains powdered aluminum and is of a commercial grade but diluted to provide an opacity level of light transmission in the range of 47% to 10%, such layer lying below the charge of popcorn and shortening during popping. The material of the bag comprises a pair of plies with the layer of metallized ink being printed to one of the plies and disposed between the plies of the bag.

Abstract: A conformable, self-aligning, high extraction efficiency coffee filter pack capable of flavor extraction efficiencies comparable to those obtained using an identical quantity of bulk coffee and a paper filter under identical brewing conditions, but which exhibits substantially consistent pot-to-pot brew strength for any given automatic drip coffee maker. The preferred filter pack is formed from two layers of flexible material which are secured to one another about their outermost periphery with a predetermined quantity of roast and ground coffee housed within a brew chamber formed between the two layers. The brew chamber exhibits a maximum volume between about 25 percent and about 300 percent greater than the volume of the dry roast and ground coffee contained therein. The discharge flow rate from the brew chamber is slower than the inlet flow rate into the brew chamber to permit a buildup of water and flooding of the brew chamber.

Abstract: A cooking apparatus and process for cooking food therewithin, wherein the apparatus facilitates cooking of various types of food in cooking containers, in which at least minimal agitation of the food to be cooked is desired, and wherein the food, as well as the apparatus may be expandable during the cooking process. A food containment region is provided for acceptance of the food to be cooked prior to operably sealing the cooking container. Container positioning portions are operably associated with at least a section of the cooking container so as to temporarily maintain the cooking container in a vertically supported orientation after insertion of the apparatus within an oven.

Abstract: There is disclosed a body for a retortable plastic container having a sidewall and bottom wall integrally formed as a single piece. The bottom wall has a heel portion and a recessed center portion. The heel has a resting surface and an inside corner. The recessed center portion has an outside corner. The container has an outside surface. The container is made in accordance with equations relating to reforming pressure and low fill equilibrium pressure and may be fabricated utilizing a variety of manufacturing modes since the providing of acceptable container configurations is not based on relative wall thicknesses.

Abstract: Paperboard packaging material for use in the manufacture of containers or inserts for containers for browning and crisping food in a microwave oven is prepared on a printing press. The components of the packaging material include paperboard or an equivalent microwave transparent substrate, a susceptor layer prepared from a printable aqueous susceptor-ink composition, and an intermediate coating applied to the paperboard substrate between the susceptor layer and the paperboard to provide a thermal barrier for the paperboard substrate. The thermal barrier layer may be coated or printed on the paperboard substrate as a substantially uniformly thick layer while the susceptor-ink layer may be pattern-printed on the substrate in varying thickness corresponding to the location of food intended to be packaged in containers prepared from the packaging material. The printed susceptor material is overprinted with a food contact coating.

Abstract: Retortable high panel strength plastic containers have a recessed circular center portion in the bottom wall of the container which facilitates the volumetric changes in the container during a sterilization process. Examples of containers having this feature are disclosed as well as the cross-sectional profile of the recessed circular center portions of the bottom walls of the containers.

Abstract: A shelf stable package for shipping and popping corn in a microwave oven comprising, a bowl formed of microwaveable plastic, transparent to microwave energy with a conical bottom, a charge comprising corn kernels and a shortening, which is solid at room temperature, said kernels having a moisture content of at least about 11.5 percent by weight, and a plastic swirl cover layer, said plastic swirl being in the form of a plurality of folds disposed in a spiral arrangement being transparent to microwave energy, and being expansible in response to internal steam pressure generated by popping of said corn kernels. A microwave transparent paperboard shell covers at least a portion of said bowl. A metallized barrier layer can overlay said plastic swirl bonnet cover layer and in turn a paperboard outer cover overlaying said metallized barrier layer.

Abstract: A gusseted microwave food package, such as a microwave popcorn bag, is provided, having a printed-on susceptor with reduced microwave activity under the gussets of the package. The novel susceptor substantially prevents charring of the package during microwave heating at portions of the package under the gussets. Preferably, the susceptor is printed on in a plurality of small patterns so as to prevent the undesirable edge heating effects encountered with large patterns. The printed-on susceptor of this invention may be formed from ink compositions which are graphite or metal based, and are preferably printed on a surface which does not directly contact the food contained in the package. The technique of the invention may be employed with numerous different susceptor patterns so long as the print coverage, and thus the microwave activity, under the gussets is reduced to prevent charring or burning.

Abstract: A novel premix for cooking by a microwave oven comprising flour, sugar, baking powder and emulsifier, characterized in that the moisture content of the flour ranges from 1.0 to 9.5 weight %. The premix has good storage property. Namely, deterioration of oils, color and taste are not observed and caking and gas generation do not occur.

Abstract: The present invention provides an insulating microwave heating package with at least one and preferably a multiplicity of latent, uninflated or potential insulation chambers capable of inflating when exposed to microwave energy. The package includes at least two sheets of material bonded together at selected points, patches or along seal lines separated by unsealed areas which define unfilled inflation chambers between the lines, patches or points. Upon exposure to microwave energy, the package and its contents become heated. As a result of this heating process, the unfilled chambers also become heated, causing them to become filled with hot expanding air or moisture vapor. These chambers serve as insulation for the package and enhance heating of the food by reducing heat loss from the package.

Abstract: A microwave package for packaging a combination of products and ingredients, including a package formed as a bag and constructed of paper, polymer film, or the like, having collapsible gussets formed at each side, a first product chamber formed internally at a lower location of the package, at least a pair of heat seals formed upwardly of the bag, and one or more upper chambers formed therein for holding of seasoning and flavoring ingredients within said upper chambers, while a food product, or the like, to be cooked as arranged within the lower formed chamber, so that during microwaving, said seals are strategically broken due to generated heat and pressure to provide for a deposition of the flavoring onto the cooked or cooking food product to provide a readily servable food fully seasoned upon conclusion of its microwave cooking.

Abstract: The present invention provides an insulating microwave heating package with at least one and preferably a multiplicity of latent, uninflated or potential isulation chambers capable of inflating when exposed to microwave energy. The package includes at least two sheets of material bonded together at selected points, patches or along seal lines separated by unsealed areas which define unfilled inflation chambers between the lines, patches or points. Upon exposure to microwave energy, the package and its contents become heated. As a result of this heating process, the unfilled chambers also become heated, causing them to become filled with hot expanding air or moisture vapor. These chambers serve as insulation for the package and enhance heating of the food by reducing heat loss from the package.

Abstract: A disposable cartridge and a method for brewing tea while high temperature liquid is passed through the tea includes a receptacle formed of liquid-permeable sheet material and defining a cavity for receiving tea. A quantity of tea is provided in a portion of the cavity. An inflatable cover, also formed of liquid-permeable sheet material, completely covers the portion of the cavity containing the tea. The cover is sealingly connected to the receptacle. The cartridge is placed within the brewing basket of a drip brewer and closely interfits with the interior thereof so as to substantially take up all the space in at least a lower portion of the basket. Hot liquid is supplied from the drip brewer to drip into the receptacle and, in response to the liquid permeating the cover and temporarily accumulating in the portion of the cavity containing the tea, the tea expands in the cavity and the tea brews therein.

Abstract: A package structure for microwave popping of popcorn comprises a conventional tubular body bag wherein a closed bottom end minor length portion is folded over onto a major length portion defining a combined unpopped popcorn space and popped popcorn chamber, and a separator screen is secured across the body between the minor and major length portions at the line along which the minor portion is folded over onto the major portion. The separator screen has screen holes for shaking out separation of spent unpopped popcorn kernels from popped popcorn within the expanded bag chamber into the pocket under the separator screen. A rim about the screen holes blocks return of the spent unpopped kernels from the pocket to the popped popcorn chamber.

Abstract: A food package for cooking of the food in a microwave oven is formed of a heat-resistant synthetic resin impermeable to oil and moisture and has at least one opening for allowing steam to escape when the internal pressure in the package is increased beyond a certain value by the steam generated during heating. The number of openings and the size of each opening are selected with consideration of the package volume or size and the type of food to be packaged so as to adjustably maintain within the package a pressure and a temperature each of which are within a range of predefined values during cooking in the oven. The package distends with increase of the internal pressure to provide a visual indication that cooking is complete. A method of cooking the packaged food comprises using the described package which adjustably maintains the internal pressure in the package within the range of about 1.00 to about 1.15 atm and the temperature within the range of about 100.degree. to about 105.degree. C.

Abstract: A package for transportation, storage and microwave cooking of an individual serving of popping corn includes a semi-rigid cardboard box having downwardly converging and generally trapezoidal sides, the inner surfaces of which are oil absorptive. One pair of opposed sides includes a pair of fold-down closing flaps which can be interlocked to releasably close the top of the box and each of which is provided with a pair of matching score lines to define a central flex section for the box top, so that the top flexes upwardly upon cooking. A small raw corn and oil container is positioned in the bottom of the box and is covered by a film sealed to a flange extending outwardly from the top edges of the container to the sides of the box.

Abstract: A technique is described by which a predetermined amount by weight of ground coffee can be packaged into a container while the coffee density may vary within a range. The amount of ground coffee is supplied into a container along a feed path to fill the container and form a column that extends above the upper rim of the container. The ground coffee is compressed to a predetermined head level by compressing a region around the feed path while leaving a small column of uncompressed coffee. In another embodiment, the volume of the container is expanded during compression by outwardly deforming a container end. This enables the stiffening of the ground coffee to support a smooth unbeaded outer wall after vacuum packing without paneling effects.

Abstract: This invention relates to bags suitable for containing edible components during microwave cooking. The bags comprise two opposing side panels and an inwardly pleated bottom panel between the opposing side panels. The side panels are joined to one another along their side edges and to the bottom panel along its outside edge. Sections of the side panels may also be seamed or bonded to sections of the bottom panel so that the inside surface area of the bottom panel is substantially less than the outside surface area of the bottom panel. The bags optionally contain microwave susceptor materials and self-closing features.

Abstract: This invention relates to bags suitable for containing edible components during microwave cooking. The bags may serve as shelf-stable packages for the uncooked edible components as well as containers for the edible components during microwave cooking. The bag comprises two opposing side panels and an inwardly pleated bottom panel between the opposing side panels. Sections of the side panels may be seamed or bonded to sections of the bottom panel so that the inside surface area of the bottom panel is substantially less than the outside surface area of said bottom panel. The side panels are also joined along one side edge and the top edge, leaving an opening on one side. In one embodiment, self close ties are provided by slitting the bag in the area joining the side panels to the bottom panel. In another embodiment, a funnel opening to the bag is provided by means of an appropriately configured seal or bond between the side panels.

Abstract: A package with a preferentially releasable seal is provided, suitable for use in microwaveable food cooking. The seal includes a heat-releasable polymer in contact with a microwave susceptor material. Upon heating in a microwave oven, the seal releases in response to force generated by the cooking of the food.

Abstract: Wet laminating adhesives capable of withstanding the stresses encountered during heat sealing operations are prepared from emulsion copolymers consisting essentially of 45 to 80% by weight of a vinyl ester of an alkanoic acid, 10 to 30% ethylene, 5 to 30% of dialkyl maleate, 0.5 to 2% of an N-methylol containing comonomer and 0.5 to 4% of an ethylenically unsaturated mono- or di-carboxylic acid. These specific emulsion copolymers are prepared utilizing standard emulsion polymerization procedures with hydroxyethylcellulose or polyvinyl alcohol as a protective colloid. The emulsion polymers thus produced provide superior wet laminating adhesive properties for use in substrates which are to be formed into microwavable packages or bags.

Abstract: Corn kernels packaged within a bag can be popped within a microwave oven and then flavored with powdered cheese in two ways. In the first embodiment, the cheese powder is imcorporated in the bag with the corn kernels, oil or shortening, and other ingredient to be subjected to microwave. In the second embodiment, the powdered cheese is applied by sprinkling it on the ingredients within the bag after microwave corn popping, closing the bag, shaking it, and repeating the process several times. In both of these embodiments, when the cheese contacts the hot popcorn, it melts and adheres to the surface of the popcorn. To prevent the melted cheese from giving the popped corn a mottled appearance, a coloring material which generally corresponds to the color of the cheese powder is included as an ingredient in the bag of upoppped kernels. During microwave popping, the coloring is distributed in the bag and coats the popped corn. As a result, a cheese-flavored popcorn with a uniform, pleasing appearance is produced.

Abstract: A heating system for heating food provides a heated forced air source and a food package including an air circulating bag for convection heating of the food. The food package can include an interior food storage pouch which is not exposed to direct impingement by the circulating air preventing cooking oils or smoke from the mixing with the circulating air flow.

Abstract: Corn kernels packaged within a bag can be popped within a microwave oven and then flavored in two ways. In the first embodiment, the flavoring is incorporated in the bag with the corn kernels, oil or shortening, and other ingredients to be subjected to microwaves. In the second embodiment, the flavoring is applied by sprinkling it on the ingredients within the bag after microwave corn popping, closing the bag, shaking it, and repeating the process several times. In both of these embodiments, when the flavoring contacts the hot popcorn, it melts and adheres to the surface of the popcorn. To prevent the flavoring from giving the popped corn a mottled appearance, a coloring material which generally corresponds to the color of the flavoring is included as an ingredient in the bag of unpopped kernels. During microwave popping, the coloring is distributed in the bag and coats the popped corn. As a result, a flavored popcorn with a uniform, pleasing appearance is produced.

Abstract: A device and method to pop corn while preventing any unpopped kernels from mixing with the popped corn and further preventing the already popped corn from burning. Each corn kernel is placed into an individual cell on a cassette. When the kernel is popped, it pops out of the cell and falls off of the cassette and is thus removed from the heat source. The unpopped kernels remain in the cassette where they will later be disposed of.

Abstract: A flexible, generally tubular, three-surface, single-pleated, microwave-penetrable package for use in cooking popcorn. Two transverse seals and one lengthwise-extending seam seal the package. Venting means releases accumulated steam produced by the popping corn and the package maintains its expanded structure even after venting has commenced. A convenient means of opening the package is also provided.

Abstract: A method is provided for obtaining an acceptable configuration of a thermally processed container packed with food. Improvement in container configuration is attained by proper container design, by maintaining proper headspace of gases in the container during thermal processing, proper pressure outside the container during the cooking cycle and cooling cycle of the process and/or by controlled reforming of the bottom wall of the container. Further improvements are attained by controlling the thermal history of the empty container, such as by pre-shrinking the container before it is filled with food and sealed.

Abstract: A microwavable package incorporating controlled venting, including a bag formed of a series of walls, the front, back, side gusseted, and bottom walls, with the walls being of the type formed of a series of laminates constructed of at least a pair of laminar materials, forming at least an inner and outer layer for the structured bag, a vent chamber provided between select of said laminates to afford a controlled venting of the cooking generated pressure and steam from the interior of the bag to its exterior during a cooking process, at least one vent passage provided through the inner laminar material within the region of the disposed vent chamber, said vent chamber extending to the exterior of the bag, whereby during the heating of an item within the bag its generated pressure and steam enters into the vent chamber by way of the vent passage and is released exteriorly of the bag during cooking, while maintaining the integrity of the package and its upper seal during the process.

Abstract: A bistable expandable bottle preferably including a concentrated material to be diluted, said bottle being comprised of convex shaped bellows when in its expanded condition, said bottle also including opposed handle means for facilitating the extension of the bottle from its collapsed to its expanded condition. In a preferred embodiment a self-venting closure is also employed to seal the orifice in said bottle to permit extension of the bottle from its collapsed to its expanded condition without loosening or removing of the closure.

Abstract: A sandwich wrapper is formed from a substantially rectangular sheet by providing a plurality of overlapping folds which are positioned into a substantially pleated arrangement. Two substantially parallel lines of adhesive, glue, or adhesive tape are used to attach spaced apart zones of the folded areas to each other. The dimensions of the sheet with respect to an article to be wrapped, spacing between the adhesive lines, and dimensions of the fold can be calculated to provide an efficient and cost-effective food wrapper.