Support with rotary symmetric openings for filter aid, method and apparatus
US4288330A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1976 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Dec 16, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K2103/50
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.