FIELD: pulp and paper industry.
SUBSTANCE: method of producing non-white paper for printing involves sulphate pulping of hardwood pulp to obtain hardwood pulp with Kappa number of 13-14. Then, the obtained hardwood cellulose is subjected to oxygen-alkaline treatment to obtain hardwood cellulose with Kappa number of 7.5-8.5. After that, oxygen-alkaline bleaching is carried out in the presence of hydrogen peroxide (EOP) of the obtained hardwood cellulose to obtain semi-bleached hardwood cellulose having whiteness of 38-40% ISO. Obtained semi-bleached hardwood pulp is combined with hardwood chemical-thermomechanical wood pulp (CTMP) and precipitated calcium carbonate (PCC) at ratio of 70 pts. wt. hardwood pulp, 27-33 wt.pts. hardwood CTMP and 19-21 wt.pts. PCC to obtain a paper pulp composition. Paper for printing is formed from the obtained paper mass.
EFFECT: obtaining non-white paper for printing, having acceptable whiteness and at the same time optimum mechanical and printing properties.
19 cl, 1 dwg, 10 tbl, 1 ex
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Authors
Dates
2025-06-04—Published
2024-05-15—Filed