| 摘要 |
<p>PURPOSE:To avoid crack, separation of contact joint, and leakage of liquid or gas in a gas shielding layer, by exposing the end face of fringe part of a gas shielding layer at the end face of fringe part of an elastic material layer, and jointing the end face of a back-up ring to the end face of the fringe part of the elastic material layer. CONSTITUTION:A bladder main body 10A is composed of an elastic material layer 11 such as rubber and a gas shielding layer 12 arranged on the inner circumferential face of the layer 11 by contact jointing or inserting. An elastic fitting part 11a of elastic material such as rubber is provided on the inner circumferential face of fringe part of the gas shielding layer 12, and an elastic fitting part 11b is provided on the fringe part of the elastic material layer 11. A back-up ring 10B of teflon or the like is jointed to the end face of the fringe part of the elastic material layer 11 to insure sealing property and prevent dislocation of the fringe part of the bladder main body 10A, accompanied with expansion or contraction of the elastic material layer 11. Consequently, crack of the gas shielding layer, generation of separation of contact joint, and leakage of liquid or gas can be avoided, and variation of gas pressure with the lapse of time can be restrained.</p> |
