Fuel hose for resin fuel tank and method of producing the same

摘要

A fuel hose for a resin fuel tank has a triple layer structure including a barrier layer (1) made of an alloy material consisting primarily of EVOH and modified HDPE, and a pair of welding layers (2) made of HDPE and formed on an inner peripheral surface and an outer peripheral surface of the barrier layer (1), respectively. An opening portion of the fuel hose at one end is configured in the form of an increased diameter portion and also in the form of a thick-walled portion. The increased diameter portion (or the thick-walled portion) is formed by reducing the speed of movement of dies when a hose base body is extruded into an increased diameter portion of a die surface of the dies during extrusion.