| 摘要 |
<p>A filter body with a self-supporting, open-pore composite body (1), which surrounds a coarse-pored support body (3) consisting of coarse grain (7) bound with extraneous or intrinsic material and a fine-pored, diaphragm (4) bonded on an external surface of the support body (3) and containing fine grain bound with extraneous or intrinsic material, in which in order to simplify manufacture and achieve a higher degree of resistance to loads which occur, the diaphragm (4) contains, in addition to the fine grain (8) and a binder, fibres (9) of which the absolute diameter is between 0.3 and 30 microns, their length being at least ten times that of their diameter and being at least 10 microns long; the percentage of fine grain, fibres and binder per unit volume is (60-40) : (40-20) : (30-10); the ratio of the thickness of the support body (3) to the thickness of the diaphragm (4) is between 5 : 1 and 75 : 1; the absolute thickness of the diaphragm (4) is between 0.2 and 2 mm and the ratio of the specific permeabilities of the support body (3) and the diaphragm (4) for fluids in the laminar flow range is between 2 : 1 and 100 : 1. In addition a process is proposed for the production of such a filter body.</p> |
