Abstract: A twin wire paper machine having structure for controlling the common path taken by the wire. A web-carrying wire and a web-pressing wire having a common path extending upwardly from a lower forming roll to an upper couch roll with the web which is formed being compressed between these wires while they travel along this common path, the web-carrying wire continuing to transport the web beyond the common path of the two wires. The forming and couch rolls define between themselves a space situated on one side of a straight line which is tangent to both of these rolls and which contacts the common path of the wires at the regions of these rolls.

Abstract: A paper machine having upper and lower wires and wherein an adjusting structure cooperates with a portion of at least one of these wires to move this wire portion close enough to a cooperating portion of the other wire to achieve a twin-wire operation and to move the adjustable wire portion away from the cooperating wire portion to achieve at the latter a single-wire operation, so that at least in part the wires are adjustable one with respect to the other to provide for the option of operating the machine, at least in part, as a single-wire machine or as a twin-wire machine.

Abstract: Structure for facilitating separation of a web and wire in a paper machine. Steam is supplied to the wire at the separating location where the web and wire separate from each other at a side of the wire opposite from the side where the web forms so as to facilitate separation of the web and wire from each other. Steam is supplied from the interior of a container which has a foraminous wall directly engaging the wire so that through the pores of the foraminous wall the steam will discharge to be conducted to the wire. The structure is particularly suitable in connection with twin-wire formers as well as in connection with the manufacture of tissue paper.

Abstract: A papermaking machine of the Fourdrinier type having a machine wire which passes about a breast roll adjacent a head box and which passes around a further curved guide member spaced from the breast roll and about which guide member there is also entrained a belt in the form of a felt or additional wire. Beneath the machine wire between the breast roll and the curved guide member is a suction region which is characterized in that it is free of any wire supports or the like which would create pressure impulses in the suspension on the wire, which pressure impulses would interfere with the formation of the paper sheet.

Abstract: A paper making apparatus for producing sheets of paper at speeds in excess of 200 m/minute. A breast roll and a wire cage turning cylinder are disposed above and below a forming roll. The forming roll is a hollow roll having a smooth surface. A belt passes in an S-shape over the forming roll and turning cylinder and a wire belt passes over the breast roll, forming roll and turning cylinder. The head box discharges raw material between the wire belt and the S-shaped belt, and a web is formed along the circumference of the forming roll over an angle of about 100.degree.. A web pick-up device is provided under the turning cylinder to separate the formed web from the wire belt.

Abstract: The web-forming section of a twin-wire papermaking machine includes a plurality of sets of web deflectors. Alternate sets are disposed on opposite sides of a pair of forming carriers between which a water suspension of fibers is disposed. Each set of deflectors has a plurality of deflectors providing forming carrier guiding surfaces spaced along a gentle convex curve. The sets of deflectors are disposed to guide the forming carriers over a tortuous path through the forming section. The tension in the forming carriers presses the outer carrier against the inner carrier at each curve, expressing water from the suspension through the carriers. The expressed water is doctored off by the deflectors.

Abstract: A twin-wire paper manufacturing machine wherein endless main and auxiliary wires are situated directly next to each other only at a convex forming surface of a forming board so that the compacting of the web takes place only between those parts of the main and auxiliary wires which assume the curvature of the forming surface. Preferably the curved forming surface forms part of a cylinder of constant radius so that the curvature of the wires during compacting of the web therebetween also is constant. By driving the wires at the same angular velocity as they travel along the forming surface, relative movement between the wires during compacting of the web therebetween is reduced to a minimum.