| 摘要 |
813,509. Multiple-ply paper-board-making machines &c ST. ANNE'S BOARD MILL CO. Ltd. Oct. 8, 1956 [Oct. 14, 1955], No. 29256/55. Class 96. Pulp supplied from a flow-box 12 to a travelling wire-cloth 1 is formed into a web 14 and may be inverted whilst it is carried between the wire 1 and a coacting wire 4, the wire 1 being then directed by rolls 6 to bridge over a second flow-box 11 feeding a layer of pulp to the wire-side of the web 14, the wires converging so that water is expressed through the wire 1, its momentum carrying it up a shoot 9 and into a channel 13 for removal. Further plies are likewise formed, on opposite sides of the composite web, by successively inverting the web and wires and raising the wires 4 and 1 alternately to accommodate further flow-boxes 11. Formation may be aided by suction zones 3A in rolls 3. In modifications: (1) suction boxes are used under horizontal runs, or adjacent vertical runs of the wires etc.; (2) each reversal of the wires occurs about a single roll 3 and pulp is fed into spaces where the wires converge at the beginnings of horizontal runs; (3) two supplies of pulp are arranged at each of a number of horizontal runs; or (4) there may be one supply at the middle and one at the beginning of a run; and (5) supplies may be above and below a single horizontal run. Webs thus made have longer fibres at and near their outer surfaces than those of the remainder of the outer plies. |
