Process for manufacturing of composite pipes
AssigneeSumitomo Electric Industries, Ltd.
InventorRyosuke Hata
Life of this patent
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Abstract
Improved composite pipes are proposed which comprise an outer pipe made of plastic and a thin lead layer on the inner wall of the outer pipe. The lead layer is formed by arranging a lead pipe in the outer pipe and expanding it by use of pressure medium into close contact with the inner wall of the outer pipe. The outer pipe may be circular or square or double-path. A process for producing the composite pipes is also proposed.
Claims14
A process for producing a composite pipe comprising steps of arranging a lead pipe in an outer pipe made of plastic with some gap therebetween, and expanding the lead pipe by sealing a pressure medium in said lead pipe until it gets into close contact with the inner wall of said outer pipe to form a lead layer.
A process for producing a composite pipe comprising steps of arranging a lead pipe in an outer pipe made of plastic with some gap therebetween, and expanding the lead pipe when inserted into the outer pipe until said lead pipe expands into close contact with the inner wall of said outer pipe to form a lead layer thereupon.
Dependencies are inferred from the claim text.