| 摘要 |
<p>Apparatus and process settling layer filtration in which the liquid to be filtered is passed through a layer of settling layer particles settled directly upon a self-supporting support member, the support member is a plate or tube, e.g. candle filter tube, perforated by a multitudinous array of holes of circular cross-sectional shape having a diameter at their smallest point in the range of 50-250 microns, and larger than the largest dimension of the larger particles, with a density of 20-400 opening per sq. cm. of member surface area whereby the layer particles form over such circular opening dome-shaped arches exhibiting increased strength and stability during actual filtration. An effective technique for producing such members by means of laser beam drilling is disclosed.</p> |
