| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, although there is a technique of fixing a flat film to a resin plate by ultrasonic adhesion to avoid detachment of the flat film from the resin plate due to a load applied continuously to the flat film by aeration during operation, the technique tends to produce local differences in the strength of fixing by solvent welding in the circumferential parts of the resin plate because there occur irregularities in the circumferential parts to be solvent-welded with the flat film, when the flatness of the resin plate itself is low. SOLUTION: In a membrane element comprising flat films 3 arranged on both sides of the resin plate 2, with circumferential parts of the flat films 3 solvent-welded entirely with the resin plate 2, the resin plate 2 and the flat films 3 are fixed together by melting two or more continuous linear protrusions 9 with a high precision of the flatness of the resin plate 2. COPYRIGHT: (C)2010,JPO&INPIT
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