Abstract: A draping system, for use in clothing a pulp forming section with an endless belt, has a rigid top frame to receive a plurality of substantially rigid poles in mutually parallel, loop supporting relation thereon, and a lightweight lower frame having semi-rigid poles for insertion within the loop of the belt and detachable spacers for holding the semi-rigid poles in spaced apart relation, the lower frame being sufficiently light to be readily supported within the belt in loop extending relation by the belt, for transverse insertion into a forming section.

Abstract: The invention relates to a device for the control of the tension of an endless belt or screen in paper handling machinery by providing a deflecting roller displaceable by two bearings guided in carriages.

Abstract: A suction head or a pick-up roll in a paper machine is mounted on a pivotable lever and is movable therewith between an operative position, an intermediate position at a short distance from the operative position, and a retracted position at a substantial distance from the operative position by two hydraulic cylinder and piston units whose cylinders are articulately connected to the frame and whose piston rods are articulately connected to the lever. The piston rods are rigid with first pistons, and each unit further comprises an annular second piston which surrounds the respective piston rod. Admission of pressurized fluid into a first chamber of each cylinder results in movement of the second pistons from first to second positions to thereby move the lever from operative to intermediate position through the medium of the first pistons and piston rods.

Abstract: A paper machine which has a dewatering system accordng to which during web formation as dewatering progresses the dewatering pressure increases. The stock from a headbox is initially delivered to a single liquid-pervious web-carrying element. As the latter travels away from the headbox with the stock received therefrom it meets a web-pressing element which together with the web-carrying element forms a twin-wire type of construction with the web being compressed between these elements as they travel along a common path. While these elements travel along a common path they are guided by structure which provides for increasing pressure on the web between the elements so that as dewatering progresses the pressure on the web between the elements increases. In this way it is possible to avoid an initial undesirably violent dewatering of the web during an initial phase in the formation thereof. As the above elements travel along their common path the direction of travel thereof preferably is reversed.

Abstract: A twin-wire paper machine and method for operating the same. The machine includes an endless carrier wire and an endless pressure wire respectively extending along closed separate loops and having common run portions between which a web is compressed while travelling from an inlet end to an outlet end of the common run portions. A pair of guide rolls are respectively situated in the loops and engage the wires in advance of the inlet end of the common run portions to direct the wires respectively along converging paths toward the inlet end of the common run portions, these converging wire paths forming an entrance region where a headbox is located for directing a stock jet through a slice defined by a pair of lips of the headbox. A forming board engages one of the wires between the inlet end of the common run portions and the guide roll which engages this one wire, and the stock jet is directed toward this one wire and the forming board engaging the same.

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: An elongated machine frame has a plurality of uprights which are spaced longitudinally of the frame and subdivide the same into individual sections each provided with a support structure. A first plurality of rollers is cantilevered on the support structures in these sections and an endless felt web is trained about and supported by these first rollers, extending over substantially the length of the machine frame. Each section has an endless upper screen located above the felt web and defining with the same a gap in which a ply formed upon the respective upper screen is laid onto the felt web. The upper screens are each supported by a plurality of second rollers which are also cantilevered on the respective support structures. Cut-outs are provided in the support structure to permit installation and removal of the felt web and the upper screen.

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.