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Filament winding apparatus and method

Image Number 3 for United States Patent #4078957.

A precision thermoplastic winding method and apparatus for forming heterogeneous pipe by winding a first hot thermoplastic strand on a mandrel, then applying a second strand of uncured thermosetting material on the first layer to form a second layer on the mandrel, and thereafter helically winding a hot thermoplastic strand on the second layer to form a third layer on the mandrel and to thus seal and cure the second layer of thermosetting material.

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