Patent ID: 6656362
Filing Date: 2003-12-02
Classification: B01D,Y02A

Abstract:
A spiral reverse osmosis membrane element, whereina plurality of bag-shaped reverse osmosis membranes, permeated liquid passage members arranged inside said reverse osmosis membranes, and a plurality of feed liquid passage members interposed between said reverse osmosis membranes are wound around an outer surface of a hollow pipe in a manner that only the interiors of said reverse osmosis membranes communicate with through-holes formed in the surface of said hollow pipe; each of said feed liquid passage members is a mesh member having series of diamond-shaped meshes formed by a plurality of linear members crossing each other; two opposite cross-points out of four cross-points of each of said diamond-shaped meshes are in line in parallel with an axial direction of said hollow pipe; relationships 2 mm&lE;X&lE;5 mm and Xwherein the absolute value of an angle between a line connecting the cross-points which are in line in the axial direction of said hollow pipe and a mesh leg is within a range of from 29 to less than 45Â°.