FIELD: paper-and-pulp industry.
SUBSTANCE: pulp for manufacturing mainly packaging cardboard contains sulfite cellulose, wood-pulp, and secondary fiber. Sulfite cellulose is, more particularly, bisulfite cellulose having rigidity 40-50 Kappa units, tear resistance 390-450 mN, and punching resistance 580-620 mN. Such bisulfite cellulose is obtained by pulping softwood at pH of cooking liquor 2.4-2.9, SO2 concentration 5.0-5.5%, and temperature 155-157°C. Wood-pulp is the one subjected to chemical, thermal, and mechanical treatment and characterized by whiteness 60-65%. Secondary fiber is ground paper waste with specified degree of grinding, optionally in the form of blend of differently ground marks.
EFFECT: improved strength characteristics and reduced manufacturing expenses.
4 cl, 1 tbl, 4 ex
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Authors
Dates
2005-07-10—Published
2004-07-20—Filed