| 摘要 |
A spiral membrane element, comprising a bag-like separating membrane wound, together with a raw water spacer, on the outer peripheral surface of a permeated water collecting tube, the raw water spacer further comprising first wire materials and second wire materials extending from the inflow side to the outflow side of raw water in a gently meandering curved shape, wherein the first wire materials extend along one membrane face of the separating membrane and form one raw water passages between the adjacent first wire materials, and the second wire materials extend along the other membrane face of the separating membrane and form the other raw water passages between the adjacent second wire materials, and the first and second wire materials are partly overlapped with each other and joined to each other at the overlapped positions.
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