公开(公告)号：US20010018959A1

公开(公告)日：2001-09-06

申请号：US09825702

申请日：2001-04-04

Applicant: Institute of Paper Science and Technology, Inc.

Inventor： Cyrus K. Aidun

IPC: D21F001/00 ,  D21F001/06

CPC classification number: D21F1/02 ,  D21F1/026 ,  D21F1/028

Abstract: Methods and apparatus to enhance paper and board forming qualities with insert tubes and/or a diffuser block in the paper forming machine headbox component which generates vorticity in the machine direction (MD) which is superimposed on the streamwise flow to generate a swirling or helical flow through the tubes of the diffuser block. Tubes of the diffuser block are designed such that the direction of the swirl or fluid rotation of the paper fiber stock may be controlled and the direction thereof is controlled in such a way to provide effective mixing, coalescence and merging of the jets of fluid emanating from the tubes into the converging section, i.e., nozzle chamber of the headbox. Also disclosed is the effective mixing of the jets generating cross-machine direction (CD) shear between the rows of jets that form at the outlet of the tubes inside the nozzle chamber of the headbox to align paper fibers in the cross-machine direction. In another alternate embodiment, the generation one or more counter-rotating vortex pairs (CVPs) may be set up inside each tube instead of a single vortex per tube. The counter-rotating vortices inside the tubes result in more effective interaction of the jets once leaving the tubes. The CVPs may be generated in four orientations in the tube block, generating controlled axial vortices promoting mixing of the jets of paper stock from the tubular elements as the jets flow into the nozzle chamber to a uniform flow field of stock at the slice opening for the rectangular jet.

Abstract translation: 在纸张成型机流浆箱部件中用插入管和/或扩散器块提高纸和纸板成型质量的方法和装置，其在机器方向（MD）上产生涡度，该机器方向（MD）叠加在流动流上以产生旋转或螺旋流 通过扩散块的管。 扩散器块的管被设计成使得可以控制纸纤维原料的旋转或流体旋转的方向，并且其方向被控制以提供有效的混合，聚结和合并从 进入会聚部分的管子，即流浆箱的喷嘴室。 还公开了在流浆箱的喷嘴室内的管出口处形成的射流排之间产生跨机器方向（CD）剪切的射流的有效混合，以在横向上对准纸纤维。 在另一替代实施例中，产生一个或多个反向旋转涡流对（CVP）可以设置在每个管内，而不是每个管的单个涡流。 管内的反旋转涡流导致离开管之后射流的更有效的相互作用。 CVP可以在管块中的四个取向中产生，当喷射流入喷嘴室时，产生受控的轴向涡流，从而促进纸料从管状元件的喷射的混合，以在切片开口处的浆料的均匀流场 矩形射流。

公开(公告)号：US20030051844A1

公开(公告)日：2003-03-20

申请号：US10202573

申请日：2002-07-24

Applicant: Institute of Paper Science and Technology, Inc.

Inventor： Cyrus K. Aidun

IPC: D21F011/00 ,  D21F001/02 ,  B01F005/00

CPC classification number: D21F1/02 ,  D21F1/026 ,  D21F1/028

Abstract: Methods and apparatus to enhance paper and board forming qualities with insert tubes and/or a diffuser block in the paper forming machine headbox component which generates vorticity in the machine direction (MD) which is superimposed on the streamwise flow to generate a swirling or helical flow through the tubes of the diffuser block. Tubes of the diffuser block are designed such that the direction of the swirl or fluid rotation of the paper fiber stock may be controlled and the direction thereof is controlled in such a way to provide effective mixing, coalescence and merging of the jets of fluid emanating from the tubes into the converging section, i.e., nozzle chamber of the headbox. Also disclosed is the effective mixing of the jets generating cross-machine direction (CD) shear between the rows of jets that form at the outlet of the tubes inside the nozzle chamber of the headbox to align paper fibers in the cross-machine direction. In another alternate embodiment, the generation one or more counter-rotating vortex pairs (CVPs) may be set up inside each tube instead of a single vortex per tube. The counter-rotating vortices inside the tubes result in more effective interaction of the jets once leaving the tubes. The CVPs may be generated in four orientations in the tube block, generating controlled axial vortices promoting mixing of the jets of paper stock from the tubular elements as the jets flow into the nozzle chamber to a uniform flow field of stock at the slice opening for the rectangular jet.

公开(公告)号：US20020148585A1

公开(公告)日：2002-10-17

申请号：US10122029

申请日：2002-04-12

Applicant: Institute of Paper Science and Technology, Inc.

Inventor： Cyrus K. Aidun

IPC: D21F011/02 ,  D21F001/02

CPC classification number: D21F1/02 ,  D21F1/026 ,  D21F1/028

Abstract: Methods and apparatus to enhance paper and board forming qualities with insert tubes and/or a diffuser block in the paper forming machine headbox component which generates vorticity in the machine direction (MD) which is superimposed on the streamwise flow to generate a swirling or helical flow through the tubes of the diffuser block. Tubes of the diffuser block are designed such that the direction of the swirl or fluid rotation of the paper fiber stock may be controlled and the direction thereof is controlled in such a way to provide effective mixing, coalescence and merging of the jets of fluid emanating from the tubes into the converging section, i.e., nozzle chamber of the headbox. Also disclosed is the effective mixing of the jets generating cross-machine direction (CD) shear between the rows of jets that form at the outlet of the tubes inside the nozzle chamber of the headbox to align paper fibers in the cross-machine direction. In another alternate embodiment, the generation one or more counter-rotating vortex pairs (CVPs) may be set up inside each tube instead of a single vortex per tube. The counter-rotating vortices inside the tubes result in more effective interaction of the jets once leaving the tubes. The CVPs may be generated in four orientations in the tube block, generating controlled axial vortices promoting mixing of the jets of paper stock from the tubular elements as the jets flow into the nozzle chamber to a uniform flow field of stock at the slice opening for the rectangular jet.

公开(公告)号：US20020117285A1

公开(公告)日：2002-08-29

申请号：US10071481

申请日：2002-02-07

Applicant: Institute of Paper Science and Technology , Inc.

Inventor： Cyrus K. Aidun

IPC: D21F001/02 ,  D21F001/06

CPC classification number: D21F1/02 ,  D21F1/026 ,  D21F1/028

Abstract: Methods and apparatus to enhance paper and board forming qualities with insert tubes and/or a diffuser block in the paper forming machine headbox component which generates vorticity in the machine direction (MD) which is superimposed on the streamwise flow to generate a swirling or helical flow through the tubes of the diffuser block. Tubes of the diffuser block are designed such that the direction of the swirl or fluid rotation of the paper fiber stock may be controlled and the direction thereof is controlled in such a way to provide effective mixing, coalescence and merging of the jets of fluid emanating from the tubes into the converging section, i.e., nozzle chamber of the headbox. 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 fiber orientation to produce an isotropic and uniform sheet. Also disclosed is the effective mixing of the jets generating cross-machine direction (CD) shear between the rows of jets that form at the outlet of the tubes inside the nozzle chamber of the headbox to align paper fibers in the cross-machine direction.

Abstract translation: 在纸张成型机流浆箱部件中用插入管和/或扩散器块提高纸和纸板成型质量的方法和装置，其在机器方向（MD）上产生涡度，该机器方向（MD）叠加在流动流上以产生旋转或螺旋流 通过扩散块的管。 扩散器块的管被设计成使得可以控制纸纤维原料的旋转或流体旋转的方向，并且其方向被控制以提供有效的混合，聚结和合并从 进入会聚部分的管子，即流浆箱的喷嘴室。 流浆箱内部的特定流动将纤维以片材的各向同性形式分布，即在所有方向均匀，基本上消除了MD优先纤维取向以产生各向同性均匀的片材。 还公开了在流浆箱的喷嘴室内的管出口处形成的射流排之间产生跨机器方向（CD）剪切的射流的有效混合，以在横向上对准纸纤维。