Patent ID: 7735430
Filing Date: 2010-06-15
Classification: B65D

Abstract:
1. An article resistant to fire and the heat of fire, the article comprising: a first sheet of co-extruded thermoformable plastic, comprising a surface layer of an intumescent polyolefin composition resistant to fire and a substrate layer of a polyolefin resin, molded over a first mold to provide a first member; a second sheet as in the first sheet molded over a second mold to provide a second member; a third member of molded plastic composed of polyolefin resin comprising an array of upward extending ribs, an array of downward extending channels and between the ribs and channels hollow areas providing dead air space; the third member being compressed between the first and second sheets to provide a rigid unitary structure wherein upper surfaces of the ribs bond to the substrate layer of the first sheet and lower surfaces of the channels bond to the substrate layer of the second sheet; the surface layers of the intumescent polyolefin compositions of the first and second sheets being exteriorly visible preventing the substrate layers from supporting a flame upon exposure to fire; and the surface layers of the intumescent polyolefin compositions of the first and second sheets in combination with the dead air space insulating the third member, the insulated third member resisting the heat of the fire to remain rigid.