Method and apparatus to enhance paper and board fo

专利名称：Method and apparatus to enhance paper

and board forming qualities

发明人：Cyrus K. Aidun申请号：US09734941申请日：20001211公开号：US06368460B1公开日：20020409

专利附图：

摘要：Methods and apparatus to enhance paper and board forming qualities withinsert tubes and/or a diffuser block in the paper forming machine headbox componentwhich generates vorticity in the machine direction (MD) which is super imposed on the

streamwise flow to generate a swirling or helical flow through the tubes of the diffuserblock. Tubes of the diffuser block are designed such that the direction of the swirl orfluid rotation of the paper fiber stock may be controlled and the direction thereof iscontrolled in such a way to provide effective mixing, coalescence and merging of the jetsof fluid emanating from the tubes into the converging section, i.e., nozzle chamber of theheadbox. A specific flow inside the headbox distributes the fibers in an isotropic form, i.e.,uniform in all directions, in the sheet substantially eliminating the MD preferential fiberorientation to produce an isotropic and uniform sheet. Cross-machine direction (CD)shear between the rows of jets that form at the outlet of the tubes inside the nozzlechamber of the headbox align paper fibers in the cross-machine direction.

申请人：INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, INC.

代理机构：Fitch, Even, Tabin & Flannery

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