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 container comprising a sidewall and an endwall connected by a heat sealed joint. The endwall has, in an operable orientation, a major upper surface, an endless, upwardly opening, peripheral channel and a heat sealable, fluid barrier, surface layer adhered to the major upper surface of the endwall. The sidewall has a heat sealable, fluid barrier, surface layer adhered to its inner and outer surfaces. The end of the sidewall is engaged and crimped within the endwall channel with the surface layers of the sidewall heat sealed to the surface layer of the endwall to form a sealed, mechanically rigid joint.