| 摘要 |
<p>A membrane pack (18) for a fluid purification apparatus comprises a porous carrier (74) on the faces of which are located membranes (70,72). The carrier is sealed at the edge of holes (22) formed in the pack by inserting a non-porous polymer ring (76) in a hole (78) in the carrier (74) and ultrasonically welding the membranes (70,72) to the ring (76). <IMAGE></p> |
