| 摘要 |
A filter unit is described a number of which may be bonded together in stack formation to form a disposable cartridge, optionally including an integral disposable housing. The unit comprises a thin plastics support (88) having flat filter membranes (68), permanently bonded to its upper and lower surfaces. The support has a central opening, a sealing rim (60), and on each surface, inner circumferential lands (66, 76) outer circumferential lands on the rim and intervening ribs or similar projections, the membranes being bonded and sealed to the lands and ribs. Each support surface adjacent the central opening has a circumferential coupling and spacing means (74, 86) for bonding stacked units together in spaced relation. Radial passages (90, 92) communicate with the spaces between the ribs. A method for bonding the membranes (68) to the support (88), using a liquid that is a solvent for the material of the support but is not a solvent for the membrane material, is also disclosed. <IMAGE> |
