Paper making and fiber liberation – Processes and products – Plural fiber containing
Reexamination Certificate
2007-11-06
2007-11-06
Fortuna, José A. (Department: 1731)
Paper making and fiber liberation
Processes and products
Plural fiber containing
C162S009000, C162S157600, C162S078000, C162S004000, C428S221000, C604S378000
Reexamination Certificate
active
10625086
ABSTRACT:
A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency generally under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. Preferably, the curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less. In general, the process is carried out in the presence of saturated steam at a pressure of from about 5 to about 150 psig.
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Ferrell Michael W.
Fortuna Jos'e A.
Georgia-Pacific Consumer Operations LLC
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