Metal-composite corrugated hoses and a process for manufacturing the same

A metal-composite corrugated hose, which is manufactured by a process comprising the steps of:

• molding a resin hose having an at least partly corrugated wall from a thermoplastic resin;
• applying an adhesive to the inner surface of the resin hose;
• and
• fitting the resin hose in a hydro-forming mold having a correspondingly corrugated surface, inserting a metal tube into the resin hose and applying a hydro-forming pressure to the metal tube, to form the metal-composite corrugated hose having an at least partly corrugated wall comprising a metal layer defining its innermost layer and a resin layer surrounding it, wherein the wall is at least partly corrugated and has in its corrugated portion a metal layer of thickness A, which is at least 20 μm, but below 200 μm, and a resin layer of thickness B, which is from 80 to 5,000 μm, each thickness of A and B having a ratio (A:B) of from 1:4 to 1:50.

A metal-composite corrugated hose, which is manufactured by a process comprising the steps of:

• shaping a metal tube so that it may have an at least partly corrugated wall;
• and
• forming a layer of a thermoplastic resin by powder coating or thermal spraying on the outer surface of the metal tube,
• to form the metal-composite corrugated hose having an at least partly corrugated wall comprising a metal layer defining its innermost layer and a resin layer surrounding it, wherein the wall is at least partly corrugated and has in its corrugated portion a metal layer of thickness A, which is at least 20 μm, but below 200 μm, and a resin layer of thickness B, which is from 80 to 5,000 μm, each thickness of A and B having a ratio (A:B) of from 1:4 to 1:50.