专利名称：Method and apparatus for pulping with
controlled heating to improve delignificationand pulp strength
发明人：J. Robert Prough申请号：US08/729022申请日：19961010公开号：US05736006A公开日：19980407
摘要：Low temperature steaming and slurrying of wood chips results in significantimprovement in treatment, the chips being maintained at a temperature below 110° C.(more desirably at about 105° C. or less, and most desirably at about 100° C. or less) untilactually heated to cooking temperature. Steaming may be accomplished utilizing avertical chip bin with one dimensional convergence and side relief or a horizontalsteaming vessel, the steaming device connected to a high pressure feeder. A pumphaving an NPSHR less than the NPSHA may be used for drawing slurry into the highpressure feeder from the steaming device, or a pump may be disposed between thesteaming device and the high pressure feeder for forcing slurry into the high pressurefeeder through a conduit including a radiused elbow. The steaming is practiced at apressure of 5 psig or less, preferably substantially atmospheric steaming is practiced.The pulp produced typically has strength properties at least about 10% greater than thepulp produced from material where it is steamed and slurried at temperatures in excessof 110° C.
申请人：AHLSTROM MACHINERY INC.
代理机构：Nixon & Vanderhye P
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