Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1996-09-18
1998-11-03
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621643, 1621646, 162166, 162167, 162182, 162183, D21H 2304
Patent
active
058303200
ABSTRACT:
The invention is a method of enhancing the strength of paper products, particularly the dry strength, without adversely affecting repulpability. It is also directed to the resulting products. It is particularly applicable but not limited to products with significant amounts of secondary fiber in the furnish. Preferably, about 10-30% of the fiber is separated from the furnish at some point prior to sheeting. This is treated with a cationic wet strength resin which is allowed to bond to the fiber. Cationic polyamide-epichlorohydrin resins are particularly useful. The treated fiber is them mixed with the untreated balance of the fiber at some point before the paper machine. Screnning fines on repulping do not normally exceed 2-3%.
REFERENCES:
patent: 3151017 (1964-09-01), Brafford
patent: 3998690 (1976-12-01), Lyness et al.
M.K. Gupta, "Chemically Modified Fiber as a Novel Sizing Material," Tappi (Mar. 1980) vol. 63, No. 3, pp. 29-31.
Stratton, Robert A. Dependence of sheet properties on location of absorbed polymer. Nordic Pulp and Paper Res. J. 4(2) 104-112 (1989).
Hunter Frank R.
Park David W.
Chin Peter
Weyerhaeuser Company
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