FIELD: pulp-and-paper industry. SUBSTANCE: method involves processing basic material in at least one refining operation; subjecting pulp to fractionation after first refining process for separating of primary fines from pulp; discharging fines. Method is also pertaining to cardboard comprising the same pulp. EFFECT: low density and, accordingly, high plumpness and increased strength of pulp. 13 cl, 8 dwg, 4 tbl
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