MANUFACTURE OF COMPOSITE PIPE

摘要

PURPOSE:To provide a composite pipe with a synthetic resin foam layer, to which an adjacent resin layer and an adjacent metal layer to the synthetic resin foamed layer are attached airtightly in one piece. CONSTITUTION:First, a metal pipe is internally lined with a synthetic resin pipe consisting of a synthetic resin foamed layer having a secondary foaming activity on the external periphery surface. Then the synthetic resin foamed layer is heated to generate foam secondarily and thus a composite pipe is obtained.