| 摘要 |
<p>In a strip of filter material, in particular filter paper for liquid or gas filters with moulded corrugations (3, 4) in which the filter material (1) is folded zigzagwise, section by section, the sections being held apart by the corrugations, the stiffness and strength of the corrugations (3, 4) are increased to prevent loss of the spacing effect of the corrugations after lenghty operation. To this end, the curve of the corrugations follows a catenary. In addition, the corrugations are shaped so that the longitudinal side of each corrugation (3) projecting above the filter material on the inflow side merges into a corrugation (4) projecting above the filter material on the outflow side. The heights of the outflow-side corrugations (4) are less than the heights of the inflow-side corrugations (3). The inflow-side corrugations of one strip of filter material are in contact with the outflow-side corrugations of the adjacent strip of filter material.</p> |
