Nahtlosen Schlauser zur Herstellung von Dachlatten

摘要

A seamless tube (30) useful in making a roofing batten (20) is extruded from a polymeric material consisting essentially of a major amount of polyethylene terephthalate and a minor amount of at least one polyolefin, flattened in a vacuum sizer (120) so as to define two plies (34, 36), and milled and drawn so as to orient the polymeric material of the tube (30) longitudinally. As milled and drawn, the tube is oriented so as to have a tensile strength of at least substantially 25,000 psi (172 MPa) in a longitudinal direction. The plies (34, 36) are punched so as to have holes (38) therethrough at spaced intervals along the tube (30). When used to make a roofing batten to co-act with conventional fasteners, such as roofing screws, the tube exhibits superior characteristics of split resistance and pull-through resistance.