| 摘要 |
<p>A filter element (10) has a porous support (12) of predetermined shape which is coated with flock islands (22) in a screen pattern (Figure 1, 3) in such a manner that fibres (24) of neighbouring flock islands still overlap, but, between the latter, unflocked or sparsely flocked support surfaces (26) are present. The support (12) can be a filter paper, filter web or fabric. The flock islands (22) have a hedgehog-like structure, so that the fibres (24) from a raised adhesive surface (28) stand out in a solid-angle distribution, in particular roughly radially to form a spherical shell. The screen pattern of the flock islands (22) can be formed by crossing assemblies of uniformly spaced lines, for example parallel lines intersecting at right angles. The flock fibres (24) are composed of flexible material such as viscose staple or plastics such as polyamide, polypropylene, polyethylene terephthalate and the like, the fibre thickness being in particular between 1 dtex and 7 dtex and the fibre length (P) being namely between 0.5 mm and 1.5 mm. The centre distance (a) of the flock islands (22) from each other is 1.2 to 2.0 times their mean core diameter (d), preferably 1.5 times. …<IMAGE>… </p> |
