Hose and method of producing the same
View Patent ↗A hose and a method of producing the same. The hose includes a tubular resin inner layer, a metal plating layer formed on an outer peripheral surface of the resin inner layer, and a resin outer layer formed on an outer peripheral surface of the metal plating layer, wherein a chromium oxide film is formed on the outer peripheral surface of the resin inner layer and a metal film is formed on an outer peripheral surface of the chromium oxide film between the resin inner layer and the metal plating layer and the metal plating layer is formed on an outer peripheral surface of the metal film. Further, a chromium oxide film is formed between the metal plating layer and the resin outer layer.
1. A hose comprising
a tubular resin inner layer,
a metal plating layer formed by electrolytic plating or electroless plating over an outer peripheral surface of the resin inner layer, and
a resin outer layer formed over an outer peripheral surface of the metal plating layer,
wherein
a multilayered film comprising a first chromium oxide film formed by physical deposition and a first metal film formed by physical deposition is formed between the resin inner layer and the metal plating layer,
the first chromium oxide film of the multilayered film is positioned on the outer peripheral surface of the resin inner layer,
the metal plating layer is positioned on an outer peripheral surface of the first metal film in the multilayered film,
a single-layer film of a second chromium oxide film formed by physical deposition or a multilayered film comprising the second chromium oxide film and a second metal film formed by physical deposition is formed between the metal plating layer and the resin outer layer, and
the resin outer layer is positioned directly on an outer peripheral surface of the second chromium oxide film.
2. A method of producing the hose as claimed in claim 1 , which comprises:
a step of forming a first chromium oxide film on an outer peripheral surface of a resin inner layer by at least one physical deposition selected from the group consisting of sputtering, ionic plating and vacuum deposition;
a step of forming a first metal film on an outer peripheral surface of the first chromium oxide film by the physical deposition;
a step of forming a metal plating layer on an outer peripheral surface of the first metal film by electrolytic plating or electroless plating;
a step of forming a single-layer film of a second chromium oxide film or a multilayered film comprising the second chromium oxide film and a second metal film on an outer peripheral surface of the metal plating layer by the physical deposition; and
a step of forming a resin outer layer directly on an outer peripheral surface of the second chromium oxide film.
3. The method of producing the hose as claimed in claim 2 , wherein an operation after formation of the first metal film on the outer peripheral surface of the resin inner layer and until transferring to a step of forming the metal plating layer on the outer peripheral surface of the first metal film is conducted under an inert gas atmosphere.
4. The hose as claimed in claim 1 , wherein a metal material for the first and second metal films is a nickel-chromium alloy, chromium or stainless steel.