Cartridge membrane filter for micro-filtration
AssigneeFuji Photo Film Co., Ltd.
InventorSumio Ohtani
Life of this patent
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Abstract
The microfiltration membrane cartridge filter is formed by pleating a porous membrane sheet having a mean pore size of 0.05 to 10 .mu.m, rounding the sheet in the form of a cylinder, liquid-tightly sealing joints of the rounded sheet and liquid-tightly sealing opposite ends of the cylinder by end plates, wherein pores in the opposite end portions of the cylindrical pleated membrane are filled up with a high molecular-weight polymer to reject the liquid-permeation of the opposite end portions of the cylindrical pleated membrane. The microfiltration membrane cartridge filter can be made wet to water easily so that an integrity test for the filter is carried on easily.
Claims8
A microfiltration membrane cartridge filter comprising:
- a pleated membrane sheet having a plurality of pores and rounded in a cylindrical shape, the pores having a mean pore size in a range of from 0.5 to 10 .mu.m;
- and
- a pair of end plates liquid-tightly sealing rounded joints of the pleated filtration membrane and liquid-tightly sealing opposite ends of the cylindrical shape of the pleated filtration membrane sheet,
- wherein the pores in the opposite ends are filled with a high molecular-weight polymer to reject a liquid-permeation of the opposite ends, and
- wherein only pores inside the pleated membrane sheet are filled up with the high molecular-weight polymer while free pores remain in front and rear surfaces of the pleated membrane sheet.
Dependencies are inferred from the claim text.