Abstract: A skeletal layer of a first polymeric material, consisting of two parallel plates interconnected by spaced-apart webs, is overlain on at least one plate surface by a reinforcing layer of a more wear-resistant or otherwise protective second polymeric material, possibly with interposition of an equalizing layer of a third polymeric material. The reinforcing layer may carry a lower-melting coating of a fourth polymeric material serving to hold a covering such as a textile fabric in position thereon. The voids of the skeletal layer may be filled with foam plastic. The composite panel can be formed by joint extrusion of all polymeric layers and can be subjected to subsequent deformation under heat and pressure into a shaped body.

Abstract: A laminate particularly usable for a greenhouse or as a skylight has a glass sheet to one side of which is bonded a synthetic-resin panel formed by inner and outer synthetic-resin plates that extend parallel to but are spaced from each other by a plurality of transverse synthetic-resin webs that unitarily interconnect and space the plates and form between them a plurality of dead-air spaces. The inner plate is bonded to the face of the glass sheet, and the dead-air spaces are sealed at the periphery of the laminate.