| 摘要 |
A method and an apparatus for lining the interior surface of metal tubing with a protective coating made from either thermoplastic or thermosetting resins. The process is effectuated by the insertion of said resins into the tubing in the form of a knitted or braided mesh, smooth surfaced rods, latticed rods, or rods with perforations; the formation of a vacuum within said tube, and the rotation and heating of the outer surfaces of the tubing.
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