Patent ID: 7678273

Claim:
A filter unit ( 10 ), in particular for a water filter of a water treatment- or sewage treatment plant, comprising a plurality of permanently connected membrane plates, each of the membrane plates comprising a discharge shaft ( 2 ), opening outwardly on a longitudinal edge, for removing permeate collected in the membrane plate ( 1 ), in which at least two membrane plates ( 1 ) are arranged parallel and adjacent to one another and a liquid-tight connection is formed between the at least two membrane plates at least in first welding zones between the discharge shafts ( 2 ) of the at least two membrane plates ( 1 ), the first welding zones extending longitudinally to intersect a second welding zone that surrounds the group of discharge shafts, wherein the membrane plates ( 1 ) are manufactured out of thermoplastic material and the liquid-tight connection is a weldment of the at least two membrane plates ( 1 ), and wherein a permeate collection channel ( 11 ) surrounds the discharge shafts of the at least two membrane plates and forms a liquid-tight seal around the peripheral welding edge ( 12 ) of the permeate collection channel in combination with the second welding zone surrounding the group of discharge shafts.