Abstract: An apparatus for leak test is provided with: a gas dissolution portion having function to degasify a unused liquid; a liquid filling and circulation portion for filling the gas dissolved liquid in the test piece; a high-pressure application portion for pressurizing the filled gas dissolved liquid; a leak test portion for detecting the gas in the liquid vapor leaking out in the vacuum container from leak hole(s) of the test piece resulting from high-pressure application; and a liquid collection portion for collecting the gas dissolved liquid as relieving high pressure. The leak test process under high pressure is conducted in the closed circulated flow path. The leak test process uses the liquid easy for gas to be dissolved and to flow through the leak hole(s). Further, the leak test process uses the gas easy to dissolve in the liquid or to be detected.

Abstract: A method for producing a high-pressure tank that can reduce the positional deviation of a wound fiber bundle. In the method for producing the high-pressure tank, the fiber bundle impregnated with an uncured thermosetting resin is wound around a liner for housing gas so as to form, on the liner, a reinforcing layer with a plurality of fiber-reinforced resin layers. The method for producing the high-pressure tank includes pressing an edge portion on at least one side along the longitudinal direction of the fiber bundle in the width direction of the fiber bundle to deform the edge portion so as to protrude in the thickness direction of the fiber bundle and thermally curing the thermosetting resin in the edge portion deformed so as to form a protruding portion in the edge portion, and forming the fiber-reinforced resin layers with the fiber bundle with the edge portion deformed.

Abstract: A method for producing a high-pressure tank that can reduce the positional deviation of a wound fiber bundle. In the method for producing the high-pressure tank, the fiber bundle impregnated with an uncured thermosetting resin is wound around a liner for housing gas so as to form, on the liner, a reinforcing layer with a plurality of fiber-reinforced resin layers. The method for producing the high-pressure tank includes pressing an edge portion on at least one side along the longitudinal direction of the fiber bundle in the width direction of the fiber bundle to deform the edge portion so as to protrude in the thickness direction of the fiber bundle and thermally curing the thermosetting resin in the edge portion deformed so as to form a protruding portion in the edge portion, and forming the fiber-reinforced resin layers with the fiber bundle with the edge portion deformed.

Abstract: In a fuel cell 1 including a membrane electrode assembly 2 which includes a reinforcing-membrane-type electrolyte membrane 10A, a dry-up on the anode side is suppressed by actively forming a water content gradient in the electrolyte membrane to enhance water back-diffusion effect from the cathode side to the anode side. For that purpose, two sheets of expanded porous membranes 12a and 12b having different porosities are buried, as reinforcing membranes, in electrolyte resin 11 to obtain the reinforcing-membrane-type electrolyte membrane 10A. The reinforcing-membrane-type electrolyte membrane 10A is used to form the membrane electrode assembly 2, which is sandwiched by separators 20 and 30 such that the side of a reinforcing membrane 12b with a larger porosity becomes the cathode side, thus obtaining the fuel cell 1. When one sheet of the reinforcing membrane is buried, the reinforcing membrane is offset to the anode side to be buried in the electrolyte resin.

Abstract: A reinforced electrolyte membrane for a fuel cell which is reinforced by a porous membrane, characterized by containing void portions in a joining portion between the surface of the porous membrane and/or pore surface and the electrolyte for buffering swelling when water is contained. This reinforced electrolyte membrane for a fuel cell has improved dimensional stability even if the electrolyte swells.

Abstract: A reinforced electrolyte membrane for a fuel cell which is reinforced by a porous membrane, characterized by containing void portions in a joining portion between the surface of the porous membrane and/or pore surface and the electrolyte for buffering swelling when water is contained. This reinforced electrolyte membrane for a fuel cell has improved dimensional stability even if the electrolyte swells.

Abstract: In a fuel cell 1 including a membrane electrode assembly 2 which includes a reinforcing-membrane-type electrolyte membrane 10A, a dry-up on the anode side is suppressed by actively forming a water content gradient in the electrolyte membrane to enhance water back-diffusion effect from the cathode side to the anode side. For that purpose, two sheets of expanded porous membranes 12a and 12b having different porosities are buried, as reinforcing membranes, in electrolyte resin 11 to obtain the reinforcing-membrane-type electrolyte membrane 10A. The reinforcing-membrane-type electrolyte membrane 10A is used to form the membrane electrode assembly 2, which is sandwiched by separators 20 and 30 such that the side of a reinforcing membrane 12b with a larger porosity becomes the cathode side, thus obtaining the fuel cell 1. When one sheet of the reinforcing membrane is buried, the reinforcing membrane is offset to the anode side to be buried in the electrolyte resin.