| 摘要 |
PROBLEM TO BE SOLVED: To enable the reduction of filtrate suction pressure after film transmission (low film filtering pressure), the reduction of an increase in weight (lightening) accompanied by an increase in size, the insurance of film adhesive strength and the keeping of a filtering area ratio.SOLUTION: An immersion type flat film element includes a frame member in which a water collecting nozzle is provided to an outside part and a shelf part is provided to an inner peripheral surface, two film support members constituted of plastic stages comprising parallely fixing filtrate flow channels and a plurality of partition walls between two flat plate materials parallely arranged at predetermined intervals by drilling numberless opening to form filtrate flow channels between two flat plate material and the respective partition walls, spacers arranged on two film support members, and a flat films arranged on the spacers, and two film support members are arranged on both sides of the shelf part of the frame member so as to form water collecting channels communicating with water collecting nozzles between the frame member and the opening end part of the filtrate flow channels, and the flat films are welded to the periphery of the frame member. |
