METHOD FOR MANUFACTURING SHEET FIBRE FILTER MATERIAL (VARIANTS) Russian patent published in 2023 - IPC D21F11/14 D21H27/08 

FIELD: filter materials.

SUBSTANCE: group of inventions relates to methods for producing sheet fibrous filter material, including dissolving mineral fibre, adding a binder - ground cellulose fibre from hardwood, forming a suspension of mineral fibre and cellulose fibre and casting the web on a paper-making or cardboard-making machine. A method for producing sheet fibrous filter material is presented, which includes dissolving mineral fibre, adding a binder - ground cellulose fibre from hardwood, forming a suspension of mineral fibre and cellulose fibre and casting the web on a paper or cardboard machine, characterized by the use of the addition of nanosized fibres in an amount 0.01-10% in terms of absolutely dry matter, and nanosized fibres are obtained directly during the manufacturing process of the material in a medium of mineral fibres at the ratio, wt.%: nanofibers 0.01-15, mineral fibre 99.99-85. In another variant, a method is provided for the manufacture of sheet fibrous filter material, comprising dissolving the mineral fibre, adding a binder - ground cellulose fibre from hardwood, forming a suspension of the mineral fibre and cellulose fibre and casting the web on a paper or board machine, characterized in that the additive of nanosized fibres in an amount of 0.01-10% in terms of absolutely dry matter, and nanosized fibres are obtained directly during the manufacturing process of the material in the environment of cellulose fibres at the ratio, wt.%: nanofibers 0.01-67, cellulose fibre from wood 99.99 -33.

EFFECT: group of inventions improves the filtration coefficient, since nanofibers have an active, developed surface, which provides additional filtering capabilities of the material.

2 cl, 2 dwg, 2 ex