Method of making membrane-type filter and product thereof

Details Method of making membrane-type filter and product thereof Method of making membrane-type filter and product thereof

1989-03-21

1990-10-23

Spear, Frank

Liquid purification or separation

Filter

Material

264 49, B01D 6906

Patent

active

049649922

ABSTRACT:
The present invention is directed to a membrane filter having predetermined controlled porosity and to the method for making such a membrane filter. The membrane filter has a plurality of pores, with each of the pores having a predetermined size from top to bottom located at predetermined locations across the membrane filter. The pores each have a tapered configuration with the larger opening at the surface of the membrane filter and the smaller opening at the bottom of the membrane filter. This tapered configuration permits pre-filtering. The membrane filter is made by a method which utilizes a probe having a tapered piercing tip that pierces the membrane to form the pores. Preferably, a plurality of probes are nested together so that a predetermined number of pores can be made with one reciprocation. If additional pores are needed for increased flow rate, the bundled probes can be laterally shifted or jogged with respect to the membrane material and further pores formed. The pore size is dependent upon the configuration of the tapered tip, as well as the vertical movement of the probe. The method permits membranes to be formed from PFA, perfluoroalkoxy, as well as from all presently used membrane filter materials formed.

REFERENCES:
patent: 3930886 (1976-01-01), Mesiti et al.
patent: 4280909 (1981-09-01), Deutsch
patent: 4743520 (1988-05-01), Rosansky

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