| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber bag body, which has a quality such as a shape, a size, physical properties or the like is stabilized and the cost of which is reduced for solving the problem that the conventional rubber bag body used for a derricking gate is molded manually and the individually vulcanized rubber bag body has unstable shape, size and physical properties. SOLUTION: A core-body canvas 5 and an unvulcanized rubber layer are laminated in advance, a rectangular rubber bag-body raw fabric 8 vulcanized by a vulcanizing press is used. The raw fabric 8 is bent in the cross direction along a center line in the longitudinal direction of the rubber bag-body raw fabric 8, and a sealing material 7 formed by laminating a prepared unvulcanized internal rubber 62, a canvas 61 for a sealing and an unvulcanized external rubber 63 is stuck fast at both end sections 3 and 3' in the longitudinal direction of the bent rubber bag-body raw fabric 8 so as to cover the end sections 3 and 3' in the longitudinal direction. The end sections 3 and 3' in the longitudinal direction, to which the sealing material 7 is stuck fast are vulcanized and bonded and sealed hermetically by a vulcanizing press, and the end sections in the longitudinal direction in which the quality such as the size, physical properties or the like is stabilized are formed. COPYRIGHT: (C)2005,JPO&NCIPI
|
