Patent ID: 7887660
Filing Date: 2011-02-15
Classification: B29C,B29K,B32B,D03D,D10B,Y10T

Abstract:
1. A method for making a composite pipe, comprising the steps of: providing a core pipe, covering the core pipe with an intermediate form, heating the intermediate form, and optionally applying a jacket over at least a portion of the intermediate form and the core pipe for protecting the core pipe with the intermediate form, characterized in that: the intermediate form includes at least one winding of at least one coextruded thermoplastic elongated member, wherein the elongated member comprises a first polyolefin material coextruded with a second polyolefin material that is different from the first polyolefin material and the second polyolefin material includes an isotactic polypropylene homopolymer with a peak melting temperature greater than 160° C; and the heating step includes heating the elongated member to one or more temperatures above the melting point of the first polyolefin material but below the peak melting temperature of the second polyolefin material for consolidating the intermediate form and for at least partially melting the at least one elongated member of the intermediate form for fusing the elongated member to the core pipe.