| 摘要 |
PCT No. PCT/US92/03650 Sec. 371 Date Oct. 19, 1994 Sec. 102(e) Date Oct. 19, 1994 PCT Filed May 1, 1992 PCT Pub. No. WO93/22038 PCT Pub. Date Nov. 11, 1993Spiral wound membrane elements have permeate flow channels attached to a porous polymeric mandrel in a regular and closely spaced array. The permeate flow channels are attached to the mandrel by means of ultrasonic welding. The attaching means permits the attachment of a high density of permeate flow channels. |
