| 摘要 |
PURPOSE:To obtain a flexible tube having high strength and durability at favorable productivity, by a method wherein rigid resin wire form materials are welded to the right and left of a rubber strip to provide a three-layer band material, the band material is wound in a spiral form, and is sequentially welded to produce a tubular body. CONSTITUTION:An unvulcanized rubber is heated, and is extruded to obtain a strip. The rubber strip extruded by a heating device (shear head) 14 and two rigid resin wires extruded by an extruder 16 are welded to each other, and a composite band material 18 is extruded through a die 20a. The band material 18 is the three-layer band material comprising the resin wires 182, 184 welded to the left and right of the rubber strip 181. The composite band material 18 is directed to a tube-forming machine 22 while being maintained in the heated condition by thermal insulation or heating, and is wound in a spiral form. The tubular body 24 passed through the machine 22 is fed to a thermal insulation chamber 26, where vulcanization or rubber parts is completed. |
