Methods and apparatus for manufacturing a microwavable food container include: forming a wire mesh over a mold comprising a mirror image of the microwavable food container; immersing the wire mesh in a fiber-based slurry bath; drawing a vacuum across the wire mesh to cause fiber particles to accumulate at the wire mesh surface; and removing the wire mesh including the accumulated fiber particles from the slurry bath; wherein the slurry comprises one or more of a moisture barrier, an oil barrier, and a vapor barrier.

An object is to provide a microwave container configured to precisely discharge vapor from a vapor-discharging part to avoid any vapor discharge from the remaining portions, and the microwave container includes: a container main body having an opening in its upper portion; a flange part formed to extend outwardly from the opening of the container main body; and a heat-seal part in a rib shape formed over the entire periphery of an upper surface of the flange part and heat-sealed to a film-shaped lid member for sealing the opening, wherein the heat-seal part includes a first heat-seal part for discharging vapor generated in the container main body by breaking the heat seal with the lid member when the vapor reaches a predetermined pressure, and a second heat-seal part wider than the first heat-seal part.

A hermetically sealed package, for example a freezable microwavable package containing a food product, has a sealing film that includes a vent system that is scored by a laser into the package.

A device for microwave heating with inversion has a base and a cover defining a heating chamber. Both the base and the cover include a susceptor heatable by microwave energy and the cover includes an aperture to vent steam. With a food product in the heating chamber, the device is placed in a microwave oven resting on the base. During an initial heating period, the lower surface of the food product is browned or crisped due to conduction and steam escapes from the heating chamber via the aperture. After the initial heating period, the device in inverted and the food product comes into contact with the cover. The device is placed in the microwave oven resting on the cover during a secondary heating period in which the food product is heated further, and the upper surface of the food product is browned or crisped due to conduction.

Methods and apparatus for vacuum forming and subsequently applying topical coatings fiber-based food containers. The slurry includes an embedded moisture barrier and/or vapor barrier, and the topical coating comprises an oil barrier comprising acrylate, rice bran wax, pectin, and pea protein.

Methods and apparatus for vacuum forming and subsequently applying topical coatings fiber-based food containers. The slurry includes one or more of an embedded moisture barrier, vapor barrier, and oil barrier, and the topical coating comprises one or more of a vapor barrier, a moisture barrier, an oil barrier, and an oxygen barrier. For food containers having deep sidewalls, a spray coating system includes a first nozzle for applying a full cone spray pattern to the bottom surface of the container, and a second nozzle for applying a hollow cone spray pattern to the inside surfaces of the side walls.

A water vapor guide cover includes: a cover body, including a convex top portion and edge portion, the convex top portion configured with a first peripheral wall, the first peripheral wall configured with guiding grooves, a bottom of the first peripheral wall extended outward with a groove, the groove in combination with the edge portion, further configured with a second peripheral wall, and the second peripheral wall configured with stoppers; and a box body, including a bottom portion and a third peripheral wall configured on the bottom portion, the third peripheral wall extended outward with a platform portion, inner, outer sides of the platform portion respectively configured with first, second step portions, the edge portion in contact with the platform portion, the groove positioned above the first step portion, each stopper pressed against the second step portion, and each guiding groove positioned above an inside of the box body.

A self folding polygonal impermeable food box and a tool for its forming. The box is made from cardboard coated on its inside with PET film or foil. The box has a bottom, six lateral sides, two lateral sides and eight corner sides which are partially transparent and directed towards the inside of the box. The box is covered by a cover so that the sides of the cover rest on the outer surfaces of the lateral sides and seal the box. There is also a second variant of the box. The tool for forming the box, which is preferably made from stainless steel, has a bottom, six guides and two guides, which form the six lateral sides and the two lateral sides of the box.

A microwave heating construct comprises a base, a wall extending upwardly around the base for defining a cavity for receiving a food item, and a microwave energy shielding element overlying a lower margin of the wall, the microwave energy shielding element having an upper edge including a substantially incurved portion.

A foldable container for use in microwave ovens that comprises a first section that defines a hollow volume; with the first section closed by a second folded section that is adapted to unfold automatically between a folded configuration in a flower pattern and an expanded configuration, providing an open upper base to the unfolded container.