| 摘要 |
<p>VERTICAL TWIN WIRE PAPER MACHINE In a vertical twin-wire paper machine, the initial forming zone is a wedge-shaped zone defined by a small number of deflectors arranged to bring the two wires into pressure engagement with the sheet therebetween and to remove the initial free or rapidly draining water from between the wires as quickly as possible, consistent with good sheet formation with the economical retention of formed components. The two wires and the sheet therebetween travel through a pressure zone which includes a convexly curved intermittent surface and guide rolls arranged to guide the wires from the wedge zone into wrapping engagement with the intermittent surface under tension causing pressure on the sheet and continued extrusion of liquid through one or both wires. More than one such intermittent surface may be used, and the final travel of the wires and sheet is to a suction couch roll where the top wire is peeled away at the suction box, leaving the sheet on the upper surface of the bottom wire for pickup and transfer by conventional sheet handling techniques.</p> |
