White top paperboard

Details White top paperboard White top paperboard

2005-09-15

2009-02-17

Halpern, Mark (Department: 1791)

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

C162S181100, C162S168100, C162S169000, C428S508000, C428S535000

Reexamination Certificate

active

07491293

ABSTRACT:
A multi-layered paperboard having a high brightness and exceptional uniformity. The white topped paperboard has a base layer(s) made from wood pulp and a top fibrous layer made of unbleached wood fiber, filler and a binder to create a top fibrous layer of sufficient uniformity at moderate brightness levels. The top fibrous layer optionally contains a coagulant and/or a retention aid. In a preferred embodiment, the top fibrous layer of the multi-layered paperboard product is coated with a coating of additional fillers and binders to produce the desired level of brightness and uniformity. The invention also includes a process for making a multi-layered paperboard.

REFERENCES:
patent: 2004/0168779 (2004-09-01), Silenius et al.
patent: 02/092910 (2002-11-01), None

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