Method for the production of paper, paperboard and cardboard

Details Method for the production of paper, paperboard and cardboard Method for the production of paper, paperboard and cardboard

2005-09-08

2011-10-04

Daniels, Matthew J (Department: 1741)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S158000, C162S168100, C162S168200, C162S168300

Reexamination Certificate

active

08029647

ABSTRACT:
Process for the production of paper, board and cardboard by draining a paper stock on a wire with sheet formation and drying of the sheets, the sheet formation being carried out in the absence of finely divided inorganic flocculants and(a) polymers comprising vinylamine units and/or polyvinylformamide having a molar mass Mwof, in each case, at least 1 millionand(b) at least one cationic or nonionic polyacrylamide and/or one cationic or nonionic polymethacrylamide having a molar mass Mwof, in each case, at least 2.5 millionbeing used as retention aids.

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