Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Utilizing electrical or radiant energy
Reexamination Certificate
2007-09-11
2007-09-11
Fortuna, José A. (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Utilizing electrical or radiant energy
C162S049000, C162S088000, C162S078000, C162S089000, C162S065000, C204S157150, C205S690000
Reexamination Certificate
active
10471845
ABSTRACT:
This invention provides a process for treating chemical woodpulp, or chemical cellulose including cotton linter, including the step of applying an electron processing technology (EPT) step to chemical woodpulp, or chemical cellulose, as the case may be, on an in-line basis to provide control of pulp viscosity or degree of polymerization (DP). The invention also provides a method of process control in treating the aforementioned woodpulp or cellulose, including the step of using radiation dose-viscosity relationship curve for applying an EPT step on an in-line basis. The in-line EPT step may, in one form of the invention, replace and hence eliminate a chemical DP reduction step.
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Stepanik, et al; Electron Processing Technology: A Promising Application for the Viscose Industry, Presented at the 10th International Meeting on Radiation Processing, May 11-16, 1997; Anaheim, CA.
Graveson Ian
Mobius Heinzhorst
Weightman Derek Andrew
Costellia Jeffrey L.
Fortuna Jos'e A.
Nixon & Peabody LLP
Sappi Limited
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