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AssigneeTokai Rubber Industries, Ltd.
InventorsKazutaka Katayama, Hiroaki Ito, Takahiro Nishiyama, Koyo Murakami, Tomonori Hayakawa
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A method of producing a fuel hose having superior adhesive reliability with superior initial adhesive strength between a tubular fluororesin inner layer and a thermoplastic resin outer layer and with restrained deterioration in adhesive strength after heat aging and immersion into fuel under severe conditions such as an inside of an engine compartment. The method includes plasma treatment on a peripheral surface of the tubular fluororesin inner layer, at least one treatment of water treatment and silane coupling agent treatment on the plasma treated surface and formation of the thermoplastic resin outer layer on the treated peripheral surface.
A method of producing a fuel hose comprising plasma-treating a peripheral surface of a tubular fluororesin inner layer, treating a surface layer of the plasma-treated peripheral surface with water and forming a polyamide resin outer layer on the treated peripheral surface.
A method of producing a fuel hose comprising plasma-treating a peripheral surface of a tubular fluororesin Inner layer, treating a surface layer of the plasma-treated peripheral surface with aqueous acid solution having a pH of 2 to 6 and forming a thermoplastic resin outer layer on the treated peripheral surface.
Dependencies are inferred from the claim text.