Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Charging and/or discharging fibrous material
Patent
1996-10-10
1998-04-07
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Charging and/or discharging fibrous material
162 17, 162 19, 162 29, 162 37, 162 68, 162237, 162246, D21C 110
Patent
active
057360065
ABSTRACT:
Low temperature steaming and slurrying of wood chips results in significant improvement in treatment, the chips being maintained at a temperature below 110.degree. C. (more desirably at about 105.degree. C. or less, and most desirably at about 100.degree. C. or less) until actually heated to cooking temperature. Steaming may be accomplished utilizing a vertical chip bin with one dimensional convergence and side relief or a horizontal steaming vessel, the steaming device connected to a high pressure feeder. A pump having an NPSHR less than the NPSHA may be used for drawing slurry into the high pressure feeder from the steaming device, or a pump may be disposed between the steaming device and the high pressure feeder for forcing slurry into the high pressure feeder through a conduit including a radiused elbow. The steaming is practiced at a pressure of 5 psig or less, preferably substantially atmospheric steaming is practiced. The pulp produced typically has strength properties at least about 10% greater than the pulp produced from material where it is steamed and slurried at temperatures in excess of 110.degree. C.
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Gullichsen et al, 1995 Pulping Conference "On the Importance of Impregnation and Chip Dimensions on the Homogeneity of Kraft Pulping", pp. 227-234, Tappi Proceedings (Oct., 1995).
Cameron Hydraulic Data, 1981, Ingersoll-Rand, Woodcliff Lake, New Jersey, pp. i-iii, v, Section 1 (pp. 1-1 through 1-47).
Ahlstrom Machinery Inc.
Czaja Donald E.
Leavitt Steven B.
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