公开(公告)号：US5468348A

公开(公告)日：1995-11-21

申请号：US306844

申请日：1994-09-14

申请人： James Blackledge ,  Nazzareno Salvai ,  James A. Turner

发明人： James Blackledge ,  Nazzareno Salvai ,  James A. Turner

IPC分类号： D21F9/00 ,  D21F11/04

CPC分类号： D21F11/04 ,  D21F9/003

摘要： A multi-ply paper web is formed by bringing a top ply liner into ply-bonding engagement with a base ply web (W.sub.B) traveling on a base ply forming wire (36). The top ply liner (W.sub.T) is formed between two co-running forming wires (10, 20) in a convex upwardly/concave downwardly curved, substantially horizontal forming zone. Dewatering in the forming zone is effected by applying sub-atmospheric air pressure solely beneath the lower surface of the top ply liner (W.sub.T) being formed. Water is removed from the upper surface of the top ply liner (W.sub.T) solely by wire tension, gravity and centrifugal force created by passing the co-running forming wires (10, 20) over the convex upwardly curved path of travel. This permits a greater concentration of pulp stock fines to remain in the upper surface of the top ply liner (W.sub.T) to effect greater ply-bonding affinity with the base ply (W.sub.B) when the two plies (W.sub.T, W.sub.B) are brought together and bonded.

摘要翻译： 通过使顶层衬里与在基底层成形网（36）上行进的基底层网（WB）进行层合接合而形成多层纸幅。 顶层衬里（WT）形成在凸起的上/下向下弯曲的基本水平的成形区域中的两个共同成形线（10,20）之间。 通过在正在形成的顶层衬垫（WT）的下表面的下方施加次大气压力来实现成形区域的脱水。 仅通过将共同成形线（10,20）通过凸起的向上弯曲的行进路径产生的线张力，重力和离心力从顶层衬板（WT）的上表面去除水。 这允许当两层（WT，WB）被聚集在一起时，较高浓度的纸浆原料残留在顶层衬里（WT）的上表面中以实现与底层（WB）的更大的层粘合亲和力， 保税。