Back to results
US 4,071,641 AGranted
Method for protective coating the inside of surfaces of metal tubes by vapor deposition
AssigneeDaiwa Kogyo Kabushiki Kaisha
InventorSadao Susai
Life of this patent
Estimating the term…
Abstract
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.
Claims16
A process for lining the inside surfaces of a metal tube with a protective coat which comprises:
- shaping a resin into at least one solid form of a substantially perforated tubular member having a length substantially equal to that of the desired coating, inserting the form into said metal tube, forming a vacuum within said tube, rotating said tube at a first speed while heating it, whereby said resin forms a lining inside said tube, and cooling said tube and said resin.
Dependencies are inferred from the claim text.