| 摘要 |
<p>PURPOSE:To prevent gas shielding layers of the bladder from being buckled by reducing the thickness of the elastic material layer on which gas shielding layers are laminated. CONSTITUTION:A bladder 10 comprises an elastic material layer 11 made of elastic materials such as rubber, etc., gas shielding layers 12 laminated on the inside or outside surfaces of the layer 11, and a poppet 13 provided at the center 11A of the elastic material layer 11 on its outer peripheral surface. The thickness of the elastic material layer 11 is reduced at the area 11D between the center portion 11A and a reversely curved portion 11C to allow the elongation of the elastic material layer 11 at the outer peripheral surface of the reversely curved portion 11C not to exceed the breaking elongation of the gas shielding layers 12. Thus the occurrence of buckling of the gas shielding layers 12 is suppressed, their durability is maintained and service life is prolonged.</p> |
