| 摘要 |
PROBLEM TO BE SOLVED: To optionally change a flexibility halfway and also to obtain an excellent durability with respect to repeated bending, or the like, by successively changing the projecting form of a projecting part in an axial direction to change the flexibility. SOLUTION: The projecting amount of the projecting part 31 inward from the inner front surface of a mesh shape tube 20 is successively changed in the axial direction of the flexible tube 1. Thus, the projecting quantity of the part 31 is changed so that the flexibility of the flexible tube 1 is optionally changed halfway. Concretely, the projecting amount of the part 31 is small at the tip side of the tube 1 which is soft, the quantity gradually becomes larger toward the side of a base end and the tube 1 becomes hard. This configuration is produced by the adjustment of a die pressure or the proper adjustment of a pulling speed or the like in an extruder. Besides, a jacket layer is not required to be superimposed so that an excellent durability is obtained with respect to repeated bending, or the like.
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