Patent ID: 6692815
Filing Date: 2004-02-17
Classification: B27N,B29C,B32B,Y10T

Abstract:
An extruded plastic lumber article comprising an elongated member of solid rectangular cross section, comprising:a core part formed of a polymer material and having a cross-section formed of repeated corrugations extending from one transverse end of said core part to an opposite transverse end of said core part, said corrugations being formed by extrusion through an extrusion die having an extrusion orifice which is shaped to form said corrugations and valley portions between adjacent corrugations, said corrugations, as formed, being spaced from each other to provide said valley portions between adjacent corrugations and said corrugations are compressed toward each other to eliminate said valley portions between said adjacent corrugations after extrusion through said extrusion die whereby said adjacent corrugations are contiguous with each other such that said core part comprises a solid mass extending from said one transverse end to said opposite transverse end, said corrugations also extend from said one transverse end to said opposite transverse end across the width of said article and said corrugations extend parallel to each other along the length of said article; and a polymer coating disposed over the surfaces of said core part to completely encapsulate said core part and to form said article of said solid rectangular cross section delimited by a first pair of opposed parallel surfaces and a second pair of opposed parallel surfaces.