Microwave cooking packages suitable for use as microwave popcorn packages include at least one panel (e.g., first and second panels) formed of a vertically rigid material. A flexible portion is attached to the panels. The flexible portion may be formed of a polyester film material such as a biaxially-oriented polyethylene terephthalate (PET) film, which may be at least partially transparent. The flexible portion (and panels) defines a bag construction configured to contain a popcorn charge and to be expandable between a collapsed configuration and an expanded configuration when the popcorn charge is subjected to a popping operation. The microwave cooking package may include a vent assembly configured to at least partially open when the bag configuration is in an expanded configuration to vent the bag construction. The vent assembly includes a first portion a second portion of the bag construction that is configured to be folded against the first portion.

Carbon dioxide, such as may be used for a carbonated beverage, is produced by microwave thermal decomposition of a starting material. An apparatus for the process includes a microwave generator, a microwave chamber, a capsule received in the chamber containing starting material(s) and one or more channel(s) for recovering CO.sub.2 generated in the process.

A container for heating a food product with microwave energy having a wavelength. The container can include a generally circular centerline having an axis, and a receptacle including a sidewall extending at least partially around a cavity. At least a portion of the cavity can extend along at least a portion of the centerline. The sidewall can include an inner edge and an outer edge each being spaced apart from the axis of the centerline for at least partially retaining the food product in the cavity in proximity to the centerline.

Microwave cooking packages suitable for use as microwave popcorn packages include at least one panel (e.g., first and second panels) formed of a vertically rigid material. A flexible portion is attached to the panels. The flexible portion may be formed of a polyester film material such as a biaxially-oriented polyethylene terephthalate (PET) film, which may be at least partially transparent. The flexible portion (and panels) defines a bag construction configured to contain a popcorn charge and to be expandable between a collapsed configuration and an expanded configuration when the popcorn charge is subjected to a popping operation. The microwave cooking package may include a vent assembly configured to at least partially open when the bag configuration is in an expanded configuration to vent the bag construction. The vent assembly includes a first portion a second portion of the bag construction that is configured to be folded against the first portion.

A container for heating a food product with microwave energy having a wavelength. The container can include a generally circular centerline having an axis, and a receptacle including a sidewall extending at least partially around a cavity. At least a portion of the cavity can extend along at least a portion of the centerline. The sidewall can include an inner edge and an outer edge each being spaced apart from the axis of the centerline for at least partially retaining the food product in the cavity in proximity to the centerline.

Microwave cooking packages suitable for use as microwave popcorn packages include at least one panel (e.g., first and second panels) formed of a vertically rigid material. A flexible portion is attached to the panels. The flexible portion may be formed of a polyester film material such as a biaxially-oriented polyethylene terephthalate (PET) film, which may be at least partially transparent. The flexible portion (and panels) defines a bag construction configured to contain a popcorn charge and to be expandable between a collapsed configuration and an expanded configuration when the popcorn charge is subjected to a popping operation. The microwave cooking package may include a vent assembly configured to at least partially open when the bag configuration is in an expanded configuration to vent the bag construction. The vent assembly includes a first portion a second portion of the bag construction that is configured to be folded against the first portion.

A package for combined steam and microwave heating of food, wherein the package may include microwave energy interactive materials (MEIMs) configured for providing rapid, simultaneous microwave and steam cooking in a domestic microwave oven. The MEIMs may be configured for controlling the heating pattern within the package and to control volumetric heating of food in the package. The MEIMs may include one or more of a susceptor, shield, and/or resonating patch antenna. The package may be paper-based, or it may be manufactured of any other suitable material. One or more of the different sections of the package may comprise separate chambers respectively for the steam source and the food to be steamed, so that the steam source and the food to be steamed are separated from one another during manufacturing, storage, and cooking.

Portions of microwave energy interactive material may be cut and removed during intermediate steps in a lamination processes, so that remaining microwave energy interactive material in a resultant laminate is arranged in a pattern. Regarding the removal of the portions of the microwave energy interactive material, a compound laminate may be delaminated into parts, and one of the parts may be a sacrificial laminate that includes the removed portions of the microwave energy interactive material.

A package for combined steam and microwave heating of food, wherein the package may include microwave energy interactive materials (MEIMs) configured for providing rapid, simultaneous microwave and steam cooking in a domestic microwave oven. The MEIMs may be configured for controlling the heating pattern within the package and to control volumetric heating of food in the package. The MEIMs may include one or more of a susceptor, shield, and/or resonating patch antenna. The package may be paper-based, or it may be manufactured of any other suitable material. One or more of the different sections of the package may comprise separate chambers respectively for the steam source and the food to be steamed, so that the steam source and the food to be steamed are separated from one another during manufacturing, storage, and cooking.