Patent ID: 9254455
Filing Date: 2016-02-09
CPC Classification: B01D,C02F

Claim Text:
1. A method for filtrating, comprising: providing a filter structure for filtering a liquid containing solid particles having a diameter between 0.5 μm to 10 μm, the filter structure comprising: a foam film capable of absorbing water disposed between the first porous film and the second porous film; drifting down a mixed solution onto a top surface of the second porous film of the filter structure to intercept residue larger than the second holes in the mixed solution, wherein a liquid in the mixed solution passes through the second holes and continues to flow downward; after the first porous film and the film capable of absorbing water absorbs the liquid, compressing the first porous film and the film capable of absorbing water by a compressing force to drain out the liquid and rinse the second porous film when the liquid flows back to the second porous film due to the compression to remove the residue blocking the second holes; and removing the compressing force so that the compressed first porous film and the compressed film capable of absorbing water springs back to an original shape.