METHOD FOR PRODUCTION OF BLEACHED CELLULOSE MATERIAL, METHOD FOR PREVENTION OF YELLOWING AND LOSS OF WHITENESS IN BLEACHED CRAFT-CELLULOSE IN STORAGE AND METHOD FOR PRODUCTION OF PAPER GOODS

摘要

FIELD: paper industry.;SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.;EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.;17 cl, 33 tbl