A molded structural panel with substantially parallel major surfaces includes integrally formed thin thermosetting resin high density outer sections. Less dense thermosetting resin foam intermediate sections extend inwardly from the outer sections with the density of the intermediate sections decreasing substantially uniformly with increased spacing from the outer sections. A thin thermosetting resin high density central section is located between the intermediate sections. The high density outer sections are in a stressed state from the pressure of the ...
A method of molding a structural panel with substantially parallel major surfaces including the steps of continuously rotating an enclosed elongated mold cavity including major sections extending in opposite directions from an elongated hollow probe member disposed along a longitudinal axis thereof, dispensing a liquid foamable thermosetting resin-forming mixture from an outlet end of said probe member, withdrawing said probe member along said longitudinal axis in a preselected rate profile while substantially continuously dispensing said resin-forming m...
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