Abstract: A food container includes a case including a food storage space, a peripheral flange on tops of the case, a first heat joining area on the peripheral flange, and a first less adhesive area on the first heat joining area; a closure device including a heat sealing layer, an outer layer attached to the heat sealing layer, a second heat joining area on a peripheral edge of the closure device and corresponding to the first heat joining area, and a second less adhesive area on the second heat joining area and corresponding to the first less adhesive area; and a non-sticky after heated lacquer layer disposed between and at the first and second less adhesive areas. After heating the container, the non-sticky after heated lacquer layer is softened and does not adhere to the second less adhesive area to form an exit for releasing both steam and pressure.

Abstract: In a pressure auto-adjusting package for a heated food and a composite membrane thereof, the composite membrane includes a first membrane coated with a partial release layer thereon in a predetermined width, a second membrane provided with a cutting line corresponding to the partial release layer, and a glue layer disposed between the first membrane and the second membrane to glue the first membrane and the second membrane together, the first membrane and the second membrane are pseudo-glued at the position of the partial release layer, the cutting line of the second membrane is disposed at a heat seal opening and extends to the accommodating space. The package has a pressure generated therein when being heated, the pressure enters into a pseudo-glued area between the second membrane and the first membrane from the cutting line to form a gap where the pressure is released to prevent explosion.

Abstract: A film for gas discharge includes an inner film member, an outer film member, adhesive for securing the inner and outer film members together, an inlet through the inner film member, an outlet in the adhesive adjacent to ends of the inner and outer film members, a release member between the inlet and the outlet, and a valve on the release member. The valve may close the release member to block a passage from the inlet to the outlet or open the release member to unblock the passage. A bag made from the film for gas discharge is also provided.

Abstract: In a pressure auto-adjusting package for a heated food and a composite membrane thereof, the composite membrane includes a first membrane coated with a partial release layer thereon in a predetermined width, a second membrane provided with a cutting line corresponding to the partial release layer, and a glue layer disposed between the first membrane and the second membrane to glue the first membrane and the second membrane together, the first membrane and the second membrane are pseudo-glued at the position of the partial release layer, the cutting line of the second membrane is disposed at a heat seal opening and extends to the accommodating space. The package has a pressure generated therein when being heated, the pressure enters into a pseudo-glued area between the second membrane and the first membrane from the cutting line to form a gap where the pressure is released to prevent explosion.