| 摘要 |
The invention relates to a method of making a membrane structure having two parallel membranes (1, 2), both of which are provided with a multiplicity of perforations (3, 4), the perforations (3) in a first one of said membranes being disposed opposite to unperforated parts (5) of the second membrane (2), and a multiplicity of separate spacing means (6) arranged between said membranes (1, 2) and serving to maintain said membranes mutually spaced apart. A continuous spacing layer (8) of a material (or materials) other than that of the membranes (1, 2) and of a predetermined thickness corresponding to the said spacing, is provided between the membranes. The spacing layer (8) is successively removed via the perforations (3, 4) of at least one of said membranes, such that there are formed in the spacing layer of the finished structure exposed passages (7) between the perforations (3) in the first membrane (1) and the perforations (4) in the second membrane (2), and such that the remainder of the said spacing layer (8) forms the said spacing means (6). The invention also comprises a membrane structure made in accordance with this method. |
