| 摘要 |
In a filter well having an inlet portion and an outlet portion and a filter (4) arranged between these, the filter is carried by a support surface having a number of flow channels (6), extending radially towards an outlet (3). The ridges (8) between the flow channels (6) have a width of not more than about 0.2 mm whereby essentially the entire upper surface of the filter becomes active at filtration. The filter well is formed by forming of plastic in a forming device, whereby the flow channel pattern (5) in the support surface for the filter is formed by a forming part in the forming device, wherein a negative corresponding to the flow channel pattern (5) has been made in the surface of the forming part bya photolithographic etching process or by laser machining.
|
