PRODUCTION OF HIGHLY TENSILE PAPER Russian patent published in 2022 - IPC D21F11/02 D21G1/00 

FIELD: paper.

SUBSTANCE: invention relates to a method for producing paper with a grammage in accordance with ISO 536 of 50 to 250 g/m², air permeability according to Gurley in accordance with ISO 5636-5 of more than 15 s, and elasticity in accordance with ISO 1924-3 in the machining direction of at least 9%, and said method includes the stages of: a) providing cellulose pulp, preferably, sulphate cellulose pulp; b) refining the pulp; c) diluting the cellulose pulp produced at stage b) and unloading the diluted pulp onto a moulding mesh, resulting in a paper web; d) pressing the paper web produced at stage c); e) drying the paper web produced at stage d); f) compressing the paper web produced at stage e) in the Clupak apparatus with a moisture content of 32 to 50%, preferably 37 to 49%, more preferably 41 to 49%; g) calendering the paper web produced at stage f), optionally after drying, with a moisture content of 21 to 40%, preferably 30 to 40%, more preferably 32 ^to 39%; h) drying the paper web produced at stage g).

EFFECT: invention ensures production of highly tensile uncoated paper, which is not ordinary porous bag paper, on a paper-making machine containing a Clupak apparatus without deterioration of the printing properties or bending resistance.

42 cl, 3 tbl, 1 dwg