Tubular membrane ultrafiltration module

Claim 1

A parallel-flow tubular membrane ultrafiltration module comprising: an outer cylinder of a given length, a plurality of water permeable non-woven fabric pipes each having a permeable membrane formed on the inside thereof and having substantially the same length as the given length of the outer cylinder, said cylinder having a common take-off port from said non-woven fabric pipes, said non-woven fabric pipes each being inserted into the outer cylinder in a closely bundled state with each other and having their open ends arranged even with the ends of the outer cylinder, spaces between the outer cylinder and the non-woven fabric pipes at both end portions of the outer cylinder being filled solely with a first hardened synthetic resin bonding the pipes to each other and fixing them to the outer cylinder to provide sealing, the ends of each of the non-woven fabric pipes and the ends of the permeable membranes neighboring the ends of the non-woven fabric pipes being coated solely with a second synthetic resin which may be the same as or different from the first synthetic resin filling any spaces between the outer cylinder and the non-woven fabric pipes, wherein only said first and second resins are utilized for sealing and retaining said non-woven fabric pipes at said ends of said outer cylinder, the permeable membrane in each pipe having an inner diameter of about 4 to 25 mm, and the depth in a longitudinal direction of the non-woven fabric pipes of the coating of the second synthetic resin on the permeable membrane at the inside neighboring the open end of the non-woven fabric pipes being less than the depth in the longitudinal direction of the pipes of the first synthetic resin outside each of the non-woven fabric pipes.