Patent ID: 7141201

Claim:
The process of simultaneously molding a plurality of substantially planar exterior building products, each having two layers of thermoplastic substantially planar building product material, comprising the steps of: (a) providing a molten core material; (b) providing a molten weatherable capstock material; (c) with one of the core material and capstock material being disposed about the other material, as a parison; (d) delivering the parison into a hollow mold; (e) closing the mold; (f) blow molding the parison into a plurality of substantially planar configurations by injecting a gas into the parison in the mold to expand the parison in the mold outwardly against interior surfaces of the mold; and (g) cooling the expanded parison and removing it from the mold; whereby (h) a plurality of substantially planar exterior building products are formed from the parison, each with a layer of core material and a layer of cap stock material.