| 摘要 |
<p>PURPOSE:To join a cation exchange films into a size and form corresponding to a using aim, by a method wherein a porous polytetrafluoroethylene sheet having specific porosity, a specific mean hole diameter, a specific film thickness, a specific weight per unit area and a specific breaking strength is made into a joining member. CONSTITUTION:At the time of joining of cation exchange films, a hydrophobic and porous polytetrafluoroethylene sheet composed of porosity of 30-95%, a mean hole diameter of 0.1-30mum, a film thickness of 100-1000mum, a weight per unit area of 50-350g/m<2> and breaking strength of 1.5-10g/cm width is made into a joining member. In a mechanism joining cation exchange films, the cation exchange films are joined through, what is called, the anchor effect by a method wherein the cation exchange resin obtained fluidity through heating is caused to flow into fine hole of the porous polytetrafluoroethylene sheet through impregnation. In this case, in a hole diameter of 0.1mum or smaller the resin becomes hard to flow in, and in the hole diameter of 30mum or larger a surface area of a resin-inflow part where the anchor effect has to be developed becomes hard to obtain.</p> |
