| 摘要 |
A flexible hose having air-permeability is formed by either: sandwiching an air-permeable tape between tape end edge portions, as leading and trailing in a hose longitudinal direction, of a soft resin tape that is helically wound integrally with the air-permeable tape; or by helically winding only an air-permeable tape. The flexible hose can be properly used as a cleaner hose of a discharge circulation type by using it as an outer tube of a double tube structure. By providing lubricating properties to an inner circumference of the outer tube or an outer circumference of the inner tube, it is possible to prevent wear which might otherwise be caused by rubbing contact between the inner tube and outer tube.
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