Abstract: A die set apparatus for forming catch tabs on a flange of a first paperboard container component, such as a lid, while the paperboard is being pressed between a pair of mating dies. A plurality of cavities are formed in and circumferentially spaced around a first die, each cavity opening toward a second die and having a shearing edge. A plurality of radial passages extend through a second die, each passage in registration with one of the cavities. A plurality of catch punches are mounted for radial movement through a radial passage and into its associated cavity. Each catch punch also has a shearing edge aligned to closely slide past the shearing edge of its associated cavity. An actuator drives the catch punches into the cavities to shear a slit in the interposed paperboard and drive an adjacent segment of paperboard into the cavity to preform the catch tabs.

Abstract: An apparatus for pressforming a paperboard sheet into an articulable pressformed container. The apparatus includes a pair of male and female, matingly engagable dies, which have interfacing forming surfaces in the shape of a container for engaging a paperboard sheet. A first one of the dies has a plurality of ridges extending from the forming surface and a second one of the dies has a plurality of grooves within the forming surface. The grooves register with the ridges when the dies matingly engage for creating creases in the paperboard sheet. The invention also includes a method for simultaneously shaping the container and forming fold creases on the container thereby making the container articulable.

Abstract: A food enclosing container that has a top member and a bottom member, each formed of absorbent, corrugated paperboard, wherein at least one of the members has pressformed sidewalls. The paperboard has at least three layers, a smooth first layer, a smooth third layer and a corrugated layer interposed between the first and third layers. The top member has an unsealed interior surface so that it can absorb moisture from a contained food product. The bottom member has a grease barrier layer within the interior of its paperboard preferably positioned on the top surface of the third layer. Each of the members have engageable peripheral rims, which have a releasable, rebondable cohesive applied to the rims to permit the members to be bonded together, separated and rebonded together.