Thermoplastic pipe made with commingled glass fibers

Abstract

Methods of manufacturing a continuous pipe from thermoplastic materials are provided. The methods include the steps of providing an endless mandrel having a releasable surface, the endless mandrel configured for rotation, forming an inner liner layer on the releasable surface of the endless mandrel, forming an intermediate layer on the inner liner layer, forming an outer layer on the intermediate layer, thereby forming a continuous pipe and cutting the continuous pipe into segments. The method is characterized in that the inner liner layer is made of a thermoplastic material, the intermediate layer is made of commingled thermoplastic material and glass fiber reinforcement material, and the outer layer is made of a thermoplastic material.

Dependencies are inferred from the claim text.