MANUFACTURE OF PAPER AND PAPERBOARD

The present invention relates to a process of making paper or paperboard, the process including introducing a dual retention system into a cellulosic thin stock, subjecting the cellulosic thin stock to one or more shear stages, and then draining the cellulosic thin stock on a moving screen to form a...

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Bibliographic Details
Main Author JEHN-RENDU, CHRISTIAN
Format Patent
LanguageEnglish
French
German
Published 23.04.2014
Subjects
IMPREGNATING OR COATING OF PAPER
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
TEXTILES
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Summary:The present invention relates to a process of making paper or paperboard, the process including introducing a dual retention system into a cellulosic thin stock, subjecting the cellulosic thin stock to one or more shear stages, and then draining the cellulosic thin stock on a moving screen to form a dried sheet, wherein the dual retention system consists of a first polymeric retention aid and a second polymeric retention aid, the first polymeric retention aid is a water-soluble cationic polymer exhibiting an intrinsic viscosity of at least 6 dl/g, the second polymeric retention aid is a water-soluble cationic polymer exhibiting an intrinsic viscosity of from 4 to 9 dl/g, and the second polymeric retention aid has a greater cationic charge density than the first polymeric retention aid.
Bibliography:Application Number: EP20120728560