Fujifilm Corporation

Fuji Photo Film Company, Limited

Ryo Takeda

Hiroshi Miyachi

Hisashi Shiraishi

A dope () containing a solid electrolyte and an organic solvent is cast onto a web () so as to form a casting membrane () thereon. A first blower unit () applies dry air to the casting membrane (). After a lapse of 60 seconds from the casting, a skin layer () is formed at an exposed surface () side of the casting membrane (). The casting membrane () with the web () is brought into contact with a first liquid (), and thereby reducing a remaining solvent amount of the casting membrane (). The casting membrane () is then peeled from the web () as a membrane (). In a tenter drier (), the membrane () is dried while it is stretched. The membrane () is then brought into contact with a second liquid (). In a drying chamber (), the membrane () is further dried.

Solid electrolyte membrane, method and apparatus of producing the same, membrane electrode assembly, and fuel cell

First, second and third dopes each of which contains a solid electrolyte and an organic solvent are cast from a casting die provided with a feed block to a moving belt. A three-layer casting membrane is peeled off from the belt as a three-layer membrane containing the organic solvent. After being dried in a tenter device, the membrane still containing the organic solvent is contacted with a liquid which is a poor solvent of the solid electrolyte and having lower boiling point than the organic solvent. Thereafter, the membrane is transported to a drying chamber and dried while being supported by the plural rollers.

Solid electrolyte multilayer membrane, method and apparatus for producing the same, membrane electrode assembly, and fuel cell

Solution casting of polymer film () is provided. A dope (-) containing a polymer of cellulose triacetate and solvent is cast on a casting support band () which moves, to form a cast film (), and then the cast film is stripped from the casting support band and dried, to produce the polymer film. In the solution casting, the cast film is cooled shortly before stripping the cast film from the casting support band. Preferably, a cooling temperature to which the cast film is cooled is set lower than 6 deg. C. The cast film is cooled within a predetermined cooling region, disposed to start at a stripping point for the cast film, and to extend upstream therefrom with a length equal to or less than 25% of the length of the casting support band. The cast film is blown by cooling gas caused to flow for cooling.

Solution casting process

A cellulose triacetate film excellent in both of the tear strength and the folding endurance can be obtained by casting a cellulose triacetate dope using a solvent mixture of methylene chloride with the other solvent in a ratio of 13 to 25 wt. % of the total solvent weight on a support of which the surface temperature is kept lower than 10.degree. C., and drying with controlling the drying conditions so that the content of volatile components in the film and the film surface temperature enter a particular region or so that the content of volatile components in the film and the shrinkage percentage of the film in the cross direction enter in a particular region. The film thus obtained is also excellent in flatness.

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Kanagawa, Japan

Ryo Takeda