METHOD FOR MANUFACTURING NETTED CONTACT BODY ELEMENT, AND ROTATABLE CIRCULAR NETTED CONTACT BODY

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a netted contact body element which has excellent strength and is applicable to long-term waste water treatment.

SOLUTION: The method for manufacturing the rotatable circular netted contact body element 4 by cutting/processing a synthetic fiber block which is obtained by forming a three-dimensionally netted block from a synthetic fiber and sticking the intersecting synthetic fibers to one another at intersection points by using an adhesive is provided. The method comprises the steps of: cutting the synthetic fiber block into disk-shaped bodies and equally dividing the obtained disk-shaped body in the radial direction into fan-shaped bodies to prepare a netted contact body element precursor; forming a through-hole 20 for inserting a spacer on the fan-shaped netted contact body element precursor; compressing the outer circumference 21 of the netted contact body element precursor and the circumference of the through-hole 20 by using a hot pressing machine to form compressed parts 25; hot-pressing the whole area 22 of the netted contact body element precursor except for the outer circumference 21 of the netted contact body element precursor and the circumference of the through-hole 20 at 90-140°C by using the hot pressing machine so that the porosity becomes within 90-98%; and leaving the hot-pressed netted contact body element precursor as it is for five days or more to promote the crystallization of the thermally press-stuck synthetic fiber.

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