| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible flow tube capable of reducing dissolution of matters blended with rubber into fluid and decreasing flow resistance while keeping a desired flexibility. SOLUTION: An inner side of a rubber tube 4 is partially covered with an inner coating layer 5 made of high-density polyethylene (HDPE), so that an area of contact between the rubber tube 4 and the fluid is decreased to thereby reduce an amount of dissolution of chemicals blended with rubber. The inner coating layer 5 is formed spirally. Because the inner coating layer 5 expands or contracts in the direction of a central axis of the rubber tube 4 while increasing or reducing the diameter due to a pantograph effect, the flexibility of the flexible flow tube 2 is improved. Further, because the flexibility is improved without forming the inner coating layer in a concavo-convex shape, the flow resistance of the fluid flowing within the tube can be decreased. COPYRIGHT: (C)2007,JPO&INPIT
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