| 摘要 |
A supporting structure consisting of two layers (a, b) is applied by electroplating to the back of the microfilter foil (3). The first, lower layer (b) consists of a number of columnar projections (5) which widen at their upper ends to form mushroom-shaped caps (4) which corrode together to form an extended second layer which leaves open macropores (6) free. As compared with the micropores of the microfilter foil, the coherent supporting structure has large pores and considerable stability. <IMAGE> |
