Production of paper, board and cardboard

Details Production of paper, board and cardboard Production of paper, board and cardboard

2007-12-11

2007-12-11

Griffin, Steven P. (Department: 1731)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S158000, C162S168100, C162S168200, C162S181600, C162S181800

Reexamination Certificate

active

10523417

ABSTRACT:
Paper, board and cardboard are produced by shearing the paper stock, adding a microparticle system comprising a cationic polymer and a finely divided inorganic component to the paper stock after the last shearing stage before the head box, draining the paper stock with sheet formation and drying the sheets, by a process in which cationic polyacrylamides, polymers containing vinylamine units and/or polydiallyldimethylammonium chloride having an average molar mass Mw of in each case at least 500 000 Dalton and a charge density of in each case not more than 4.0 meq/g are used as cationic polymers of the microparticle system.

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