Asahi Glass Company, Limited

Tetsuro Tsukada

Koji Suzuki

Hiroshi Mori

Takeshi Abe

Kiyotaka Arai

Yoshihiko Saito

Tsuneji Ishii

Tutomu Fusyuku

Tsutomu Koyama

Tomomi Takahashi

A method for bonding fluororesin films, a wide fluororesin film obtained by the method, and a covering material for agricultural use, made thereof, are presented. A method of bonding films (A), wherein two sheets of films (A) made of a fluororesin, are disposed so that their edges overlap each other, a central part (b) of the overlapping portion (B) is press-bonded under heating at a temperature within a range of from lower by 5&#xb0; C. to higher by 20&#xb0; C. than the melting point of the fluororesin, and then the entire area of the portion (B) is press-bonded at a temperature within a range of from lower by 30&#xb0; C. to lower by more than 5&#xb0; C., than the melting point, to weld the two sheets of films (A); a wide fluororesin film obtained by the method; and a covering material for agricultural use, made thereof.

Method of bonding fluororesin films, and fluororesin film

A method for joining films having a hydrophilized surface at a single surface and an excellent melt-bonding force at the melt-bonded portion, which is formed by disposing two films (A) having a hydrophilized surface at a single surface, to align the hydrophilized surfaces so as to butt each end portion; overlaying a film (B) on a side of non-hydrophilized surface of the films (A), so as to bridge the butting portion, and hot-pressing the overlapping portion (c1)5 to join the two films (A). A wide film obtained by the above-mentioned method is suitable for a covering material for agricultural use.

Film joining method, a wide film produced by the joining method and a covering material for agricultural use made of the wide film

An ion exchange membrane for electrolysis comprising a first layer of a fluoropolymer having carboxylic acid groups as its ion exchange groups and facing a cathode, a second layer of a fluoropolymer having ion exchange groups, a specific resistance lower than that of the first layer and a thickness of at least 50% of the total thickness of the membrane, and a third layer of a fluoropolymer having ion exchange groups, a swelling degree higher by at least 5% than that of the second layer and a specific resistance lower by at least 30 .OMEGA..cm than that of the second layer, the first, second and third layers being laminated in this order.

Ion exchange membrane for electrolysis

Lamination of plastic film and shaped metal substrates is carried out by a pair of rolls which comprises one heat-resistant roll having a hollow for receiving at least a forward edge of the shaped metal substrate, on at least one of the surfaces of the roll. A laminated product having no defect or crease of the plastic film can be obtained.

Growing community of inventors

Ibaraki, Japan

Tetsuro Tsukada