| 摘要 |
PURPOSE:To produce a long flexible hose by a method in which the inner diameter of a synthetic-resin inner tube is formed in a smaller dimension than the dimension to be finished, and after a fiber reinforcing layer has been braided in a smaller braiding angle than stationary angle, the hose is heated in a vulcanization process, which inner pressure is applied to the synthetic resin-inner tube. CONSTITUTION:The inner tube 1 made of resin is extruded, and the rubbers, as an intermediated rubber layer 2, is extruded on said outer periphery and covers said tube. Next, a fiber reinforcing layer 3 is braided on the outer surface of the intermediate rubber layer 2. Then, its braiding angle(theta) is caused to be less than stationary the angle (54.44 deg.). Further the rubber, as an surface- rubber layer 4, is extruded and covers the layer 3. This product stock is introduced into a vulcanization can, and both ends of the product stock are sealed under the condition of about 150 deg.C and 4kgf/cm<2> of steane pressure, and then it is vulcanized under the pressurized condition of 2-10kgf/cm<2> of compressed air being shut inside. Consequently, the braiding angle(theta) is gradually increased, and coincides with the stationary angle, and then stops there. Simultaneously, the inner tube 1 made of resin is expanded, and is brought in close contact with the inner peripheral surface of the intermediate rubber layer 2. |
