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    • 4. 发明授权
    • Method and apparatus for determining pulp permeability and
compressibility for controlling papermaking process
    • 用于测定纸浆渗透性和压缩性的方法和装置,用于控制造纸过程
    • US5954922A
    • 1999-09-21
    • US865783
    • 1997-05-29
    • Bandaru V. Ramarao
    • Bandaru V. Ramarao
    • G01N33/34
    • G01N33/343
    • Method and apparatus are presented for use in a papermaking process for determining permeability and/or compressibility characteristics of a pulp suspension within the process. The method/apparatus includes monitoring height of pulp suspension within one or more test columns as a function of time while allowing pulp suspension drainage from each test column. At least one parameter representative of permeability or compressibility of the pulp suspension is determined, via computer processing, using the monitored height as a function of time of the pulp suspension within the test column. The at least one parameter representative of permeability or compressibility can comprise specific surface area (S.sub.w), specific volume (v.sub.f) compressibility constant m or compressibility constant n for the pulp suspension. Further, a measure of the permeability and/or compressibility characteristic(s) of the pulp suspension attributable to fines in the pulp suspension is obtained using two test columns, each having a different size screen disposed therein to allow different size fibers of the pulp suspension to pass therethrough. The determined parameters are employed as control feedback to the papermaking process for maintaining one or more pulp suspension characteristics near a predefined set point.
    • 本发明提供了用于确定该方法中纸浆悬浮液的渗透性和/或可压缩特性的造纸方法中的方法和装置。 该方法/装置包括在一个或多个测试柱内监测纸浆悬浮液的高度作为时间的函数,同时允许从每个测试柱排出纸浆悬浮液。 通过计算机处理,使用监测的高度作为测试柱内的纸浆悬浮液的时间的函数来确定表示纸浆悬浮液的渗透性或压缩性的至少一个参数。 代表渗透性或压缩性的至少一个参数可以包括纸浆悬浮液的比表面积(Sw),比容(vf)压缩常数m或压缩常数n。 此外,使用两个测试柱,每个具有不同尺寸的筛网设置在其中以获得纸浆悬浮液中由细粉引起的纸浆悬浮液的渗透性和/或可压缩特性的量度,以允许纸浆悬浮液的不同尺寸的纤维 通过。 采用确定的参数作为造纸工艺的控制反馈,用于在预定义的设定点附近维持一个或多个纸浆悬浮特性。