Retention and drainage system for the manufacturing of paper

Details Retention and drainage system for the manufacturing of paper Retention and drainage system for the manufacturing of paper

2007-07-17

2007-07-17

Hug, Eric (Department: 1731)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S168100, C162S168300, C162S183000, C516S110000

Reexamination Certificate

active

10840313

ABSTRACT:
A process for manufacturing a paper stock for use in making paper, paperboard and similar cellulosic products, by adding, at one or more different points of the wet end of the paper-making machine, a secondary retention and drainage agent containing a liquid smectite, and a primary retention and drainage agent comprising a natural or synthetic polymer. The retention and drainage agents can be added in any order, thus improving the retention, drainage, formation and drying, without affecting the whiteness, and enhancing the physical values of the paper, paperboard, cardboard and other similar products. The smectite can be an enhanced, concentrated, liquid smectite that can avoid the need for an on-site preparation unit.

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