FIELD: paper-and-pulp industry.
SUBSTANCE: invention is directed to preparing secondary fiber (waste paper) and can particularly be used in manufacture of paper and cardboard. Waste paper is subjected to pulping while simultaneously dispersing printing ink in presence of phosphorus-containing acid sodium salt followed by aluminum sulfate-induced precipitation conducted at pH 6.0-7.0. Pulping effected at 17-23°C for 20-30 min consumes amount of phosphorus-containing acid sodium salt, namely sodium polyphosphate or sodium phosphate, corresponding to 0.05-0.08% of the weight of dry fiber.
EFFECT: increased destruction force and improved whiteness of material.
4 cl, 1 tbl, 5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PREPARING SECONDARY FIBER IN PRODUCTION OF CELLULOSE-CONTAINING FIBROUS MATERIAL | 2005 |
|
RU2298059C1 |
| METHOD OF PREPARING SECONDARY FIBER IN PRODUCTION OF CELLULOSE-CONTAINING FIBROUS MATERIAL | 2005 |
|
RU2298057C1 |
| METHOD FOR PREPARING OF SECONDARY FILAMENT FROM CORRUGATED CARDBOARD IN THE COURSE OF MANUFACTURE OF FIBROUS MATERIALS | 2004 |
|
RU2244775C1 |
| METHOD OF PREPARING WASTE PAPER MASS FOR MAKING TISSUE PAPER | 0 |
|
SU988941A1 |
| WASTE PAPER MASS PROCESSING METHOD | 2001 |
|
RU2200215C1 |
| METHOD FOR PROCESSING WASTE PAPER INTO FIBROUS MASS | 0 |
|
SU1663078A1 |
| METHOD OF PREPARING PULP TO PAPER AND CARDBOARD PRODUCTION | 0 |
|
SU896137A1 |
| WASTE PAPER MASS PROCESSING METHOD | 2006 |
|
RU2305146C1 |
| METHOD OF MAKING CONTAINER BOARD | 0 |
|
SU825762A1 |
| METHOD FOR ALKALI TREATMENT OF PRINTED PAPER | 2010 |
|
RU2435892C1 |
