FIELD: textile and paper.
SUBSTANCE: invention relates to a method of producing paper. Method involves producing a pulp and forming a paper sheet from the pulp. At least one polymer which is functionalised with aldehyde is added before and/or after forming the sheet to the mass. Water-soluble acid is added to the formed paper sheet. Water-soluble acid has a relative acidity higher than 0.05 g/kg of dry paper.
EFFECT: higher strength of paper in wet condition.
27 cl, 6 tbl
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