Fluid-impermeable areas on porous membrane filters and their application
First Claim
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1. A porous membrane filter comprising:
- at least one fluid-impermeable area on at least one of a first side, a second side or any edge, said filter being chemically uniform, said fluid-impermeable areas are produced by means of film formation of the membrane material on one side of the membrane, said film formation comprises (a) converting the membrane material on one side of the membrane to a liquid state, (b) sealing the pores with the liquid membrane material, and (c) setting the liquid membrane material to form a film
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Abstract
The invention relates to porous membrane filters, specifically mirco- and ultraporous membrane filters, which have fluid-impermeable areas as a result of a change of their structure on one side of the membrane to a film-like state (film-formation). These filters are, for example, very suitable for an assembly in filter cartridges according to the pouring method, because they still have on the side opposite to the filmed-up side a porous structure, which offers an ideal anchoring possibility for penetrating liquid resin.
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20 Claims
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1. A porous membrane filter comprising:
- at least one fluid-impermeable area on at least one of a first side, a second side or any edge, said filter being chemically uniform, said fluid-impermeable areas are produced by means of film formation of the membrane material on one side of the membrane, said film formation comprises (a) converting the membrane material on one side of the membrane to a liquid state, (b) sealing the pores with the liquid membrane material, and (c) setting the liquid membrane material to form a film
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of producing a fluid-impermeable area on a chemically uniform porous membrane filter, comprising:
- (a) converting the membrane material on one side of the membrane to a liquid state, (b) sealing the pores with the liquid membrane material, and (c) setting the liquid membrane material to form a film.
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20. A method of producing a chemically uniform porous membrane filter having at least one fluid-impermeable area, comprising:
- (a) converting the membrane material on one side of the membrane to a liquid state;
(b) sealing the pores with the liquid membrane material; and
(c) setting the liquid membrane material to form a film.
- (a) converting the membrane material on one side of the membrane to a liquid state;
Specification