公开(公告)号：EP0769586B1

公开(公告)日：2002-10-30

申请号：EP96103662.1

申请日：1996-03-08

Applicant: Institute of Paper Science and Technology, Inc.

Inventor： Aidun, Cyrus K.

IPC: D21F1/02 ,  D21F1/00

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

公开(公告)号：EP0769586A3

公开(公告)日：1998-01-14

申请号：EP96103662.1

申请日：1996-03-08

Applicant: Institute of Paper Science and Technology, Inc.

Inventor： Aidun, Cyrus K.

IPC: D21F1/02

CPC classification number: D21F1/026 ,  D21F1/02 ,  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, thus increasing CD strength of the manufactured sheet. Vortex forming means are disclosed for a plurality of tubular elements in the diffuser box for generating controlled axial vortices in the machine direction 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：EP0769586A2

公开(公告)日：1997-04-23

申请号：EP96103662.1

申请日：1996-03-08

Applicant: Institute of Paper Science and Technology, Inc.

Inventor： Aidun, Cyrus K.

IPC: D21F1/02

CPC classification number: D21F1/026 ,  D21F1/02 ,  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, thus increasing CD strength of the manufactured sheet. Vortex forming means are disclosed for a plurality of tubular elements in the diffuser box for generating controlled axial vortices in the machine direction 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/或扩散块增强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 管子进入会聚部分，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，因此 增加制造薄片的CD强度。 公开了用于在扩散箱中的多个管状元件的涡旋形成装置，用于在机器方向上产生受控的轴向涡流，从而促进当喷嘴流入喷嘴室时来自管状元件的纸浆喷射混合到均匀的流场 股票在矩形喷气机的切片开口。