CONTACT FILTER MEDIUM MOLDING, METHOD FOR PRODUCING THE SAME AND FILTER

摘要

PROBLEM TO BE SOLVED: To provide a contact filter medium molding which attains further improvement of water quality improving effect while employing features of lightweight, good water passing property and water quality improving effect that conventional contact filter medium molding comprising a solidified accumulated material of a thermoplastic resin strand has.

SOLUTION: The contact filter medium molding comprises the solidified accumulated material of a molten thermoplastic resin strand as a whole and a plurality of high density filling accumulated lumps H1 to H9 and a low density filling region coexist. A thermoplastic resin in a thermally molten state is extruded to a strand form from a die opening to flow down into a frame body having a definite opening shape in its horizontal direction and to be accumulated in the frame body. At that time, the frame body is intermittently and repeatedly moved in a horizontal two-dimensional direction with respect to the flowing strand and the strand is cooled during flowing-down. Intermittent relative movement of the frame body in the horizontal two-dimensional direction respectively forms a plurality of high density filling accumulated lumps during a period of stopping or of deceleration moving and the low density filling region during a moving period.

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