Hose production method

Abstract

A production method of a hose having a laminate structure consisting of three layers of an inner rubber layer, a resin layer, an outer rubber layer coaxially laminated in this order, wherein after the resin layer is extruded on an outer peripheral surface of the inner rubber layer, an outer peripheral surface of the resin layer is subjected to a direct type atmospheric pressure plasma treatment in advance of extrusion of the outer rubber layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram schematically showing an embodiment of a hose production method according to the present invention;

FIG. 2 is a sectional view taken at X-X line in FIG. 1 showing a base body of the hose comprising an inner rubber layer and a resin layer;

FIG. 3 is a sectional view taken at Y-Y line in FIG. 1 showing the hose comprising the inner rubber layer, the resin layer and an outer rubber layer; and

FIG. 4 is a diagram schematically showing an atmospheric pressure plasma treatment apparatus.

Claims

1. A production method of a hose having a laminate structure comprising three layers of an inner rubber layer, a resin layer, and an outer rubber layer coaxially laminated in this order, wherein after the resin layer is extruded on an outer peripheral surface of the inner rubber layer, an outer peripheral surface of the resin layer is subjected to a direct type atmospheric pressure plasma treatment in advance of extrusion of the outer rubber layer.

2. A hose production method as set forth in claim 1, wherein the inner rubber layer comprises an acrylonitrile-butadiene copolymer rubber, or a blend of the acrylonitrile-butadiene copolymer rubber and a polyvinyl chloride; the resin layer comprises a fluororesin; and the outer rubber layer comprises a blend of the acrylonitrile-butadiene copolymer rubber and the polyvinyl chloride, or a hydrin rubber.

3. A hose production method as set forth in claim 2, wherein the fluororesin is a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer, or a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride-perfluoroalkylvinyl ether copolymer.