FILTER RETAINER

摘要

A filter retainer (1) supports filtering materials on both surfaces of the filter retainer. A pair of etched circular plates (3a, 3b) having a large number of circumferentially arranged through-holes (4) formed by chemical etching are joined to each other at a condition where the positions of corresponding through-holes (4) are aligned to coincide with each other, and at the joined form, radially extending internal paths (8) are formed between the pair of etched circular plates (3a, 3b). The structure of the filter retainer is totally novel and clears up various problems, such as accuracy and pressure loss, of conventional filter elements cause by internal structures thereof.