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US 5,409,041 AGranted
Laminated sheet
AssigneeNok Corporation
InventorsMinoru Yoshida, Masatoshi Nakamizo
Life of this patent
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Abstract
An accumulator including a shell (1) divided into a gas chamber (a) and a fluid inflow chamber (b) by a bladder (32) made of a cold-resistant and gas-barrier laminated sheet which includes a polyvinyl alcohol type resin film (20) containing a polyol type plasticizer in an amount of 15% to 50% by weight, a rubber sheet layer (21) laminated at least one side of the polyvinyl alcohol type resin film and a film (23) disposed therebetween of a non-vapor- and non-plasticizer-permeable resin film.
Claims12
An accumulator comprising:
- a shell;
- and
- a bladder in the shell dividing the shell into a gas chamber and a fluid inflow chamber, the bladder being a cold-resistant and gas-barrier laminated sheet comprising,
- a polyvinyl alcohol resin film containing a polyol type plasticizer in an amount ranging from 15% to 50% by weight, the polyvinyl alcohol resin film being comprised of a material selected from the group consisting of a completely saponified polyvinyl acetate and a partially saponified polyvinyl acetate,
- a first rubber sheet layer, and
- a first non-vapor and non-plasticizer-permeable resin film interposed between the polyvinyl alcohol resin film and the first rubber sheet.
3 more elements
A cold-resistant and gas-barrier laminated sheet for a bladder of an accumulator comprising:
- a polyvinyl alcohol resin film containing a polyol type plasticizer in an amount ranging from 15% to 50% by weight, the polyvinyl alcohol resin film being comprised of a material selected from the group consisting of a completely saponified polyvinyl acetate and partially saponified polyvinyl acetate;
- a first rubber sheet layer;
- a first non-vapor and non-plasticizer permeable resin film interposed between said polyvinyl alcohol resin film and said first rubber sheet;
- a second non-vapor and non-plasticizer permeable resin film laminated on said polyvinyl alcohol resin film;
- and
- a second rubber sheet layer laminated on said second non-vapor and non-plasticizer permeable resin film, so that said laminations are arranged in the order of said first rubber sheet layer, said first non-vapor and non-plasticizer permeable resin film, said polyvinyl alcohol resin film, said second non-vapor and non-plasticizer permeable resin film and said second rubber sheet layer.
3 more elements
Dependencies are inferred from the claim text.