Method for producing cellulose-fiber flat structure

A method of producing a cellulose-fiber flat structure, the method comprising obtaining a cellulose-fiber flat structure by filtering a very fine cellulose-fiber dispersion containing very fine cellulose fibers having an average fiber diameter of 4 to 100 nm using a filter material having a water permeability of not more than 100 ml/m2·s and an initial tensile modulus of 20 MPa eater, wherein the filter material is formed from a paper base material.

A filter material having a water permeability of not more than 100 ml/m2·s and an initial tensile modulus of 20 MPa or greater, which is used for filtering a very fine cellulose-fiber dispersion comprising very fine cellulose fibers having an average fiber diameter of 4 to 100 nm, wherein said filter material is obtained by subjecting a fabric formed using a fiber having an average thread thickness of 1 to 5 d/f to a heat and pressure treatment.

A method of filtering a cellulose-fiber dispersion, the method comprising obtaining a cellulose-fiber flat structure by filtering a very fine cellulose-fiber dispersion comprising very fine cellulose fibers having an average fiber diameter of 4 to 100 nm, using a filter material having a water permeability of not more than 100 ml/m2·s and an initial tensile modulus of 20 MPa or greater, wherein the filter material is obtained by subjecting a fabric formed using a fiber having an average thread thickness of 1 to 5 d/f to a heat and pressure treatment, wherein the filtering is selected from the group consisting of reduced-pressure filtering methods, normal pressure filtering methods and pressurized filtering methods.

A filter material having a water permeability of not more than 100 ml/m2·s and an initial tensile modulus of 20 MPa or greater, which is used for filtering a very fine cellulose-fiber dispersion comprising very fine cellulose fibers having an average fiber diameter of 4 to 100 nm, wherein the filter material is formed from a paper base material.

A method of filtering a cellulose-fiber dispersion, the method comprising obtaining a cellulose-fiber flat structure by filtering a very fine cellulose-fiber dispersion comprising very fine cellulose fibers having an average fiber diameter of 4 to 100 nm, using a filter material having a water permeability of not more than 100 ml/m2·s and an initial tensile modulus of 20 MPa or greater, wherein the filter material is formed from a paper base material having a thickness of 90 μm or greater.