Abstract: A dryer screen in a paper machine has two superimposed connected gauze structures. It has a surface gauze layer an a bottom gauze layer, each having respective weft threads (1, 3) and warp threads (2, 4). In the dryer screen, the warp threads (2, 4) are similar in both the surface and bottom gauze layers, and they are similar in cross-section. The warp threads (4) of the bottom gauze layer pass at suitable intervals over the weft threads (1) of the surface gauze layer to bond the bottom and surface gauze layer together. The cross-sectional area and shape of the weft threads of the bottom gauze are selected so that the respective actual lengths of the warp threads (2, 4) of the surface gauze layer are equal to the corresponding threads of the bottom gauze layer.

Abstract: Screening apparatus for separately removing knots and heavy reject particles from paper making stock comprises a generally cylindrical vertical housing having the interior thereof separated by a cylindrical perforated screening member into an annular screening chamber and an accepts space on the outer and inner sides of the screening cylinder respectively. Separate outlets for light and heavy reject particles are located at the top and bottom of the screening chamber, the supply flow of feed stock enters the screening chamber at the bottom thereof, and special provision is made to insure that maximum separation of the knots and other lighter reject particles from the heavy reject materials will be effected within the screening chamber with minimum contact with the screening cylinder itself.

Abstract: A wire-link belt 1, 41 comprises a first and second, opposite belt side 32, 34; 61, 64, the first side supporting a moving length of material or a web of paper 33, 62, said wire-link belt further comprising a plurality of interlinking wire coils 2, 3, 4, 5; 42,43 consisting alternatingly of end arcs 16, 17, 18, 19; 49, 50 and coil-turn legs 10, 11, 12, 13, 14, 15; 45, 46, 47, 48 connecting them and coupled in hinging manner by means of slip-through wires. To reduce slippage between the moving length of material or web of paper 33, 62 and the wire-link belt 1, 41 on one hand and buckling or elongation of said length of material on the other hand, the support of the wire coils 2, 3, 4, 5; 42, 43 at the slip-through wires is such that the wire coils 2, 3, 4, 5; 42, 43 each hinge about axes offset relative to the center plane of the wire-link belt 1, 41 towards its first belt side 32, 61.

Abstract: In the cathodic protection of a metal suction roll having a cylindrical shell with a plurality of holes extending therethrough, an insulating sleeve disposed in each hole and an anode disposed in each sleeve.

Abstract: A hydraulic accumulator prevents oil with gas entrained in it from exiting the accumulator. The accumulator comprises a completely static structure which provides laminar flow of oil from a gas pad to the accumulator outlet. The laminar flow is preferably provided by a plurality of tubes disposed between the gas pad and the outlet, each tube having a substantially greater length than the largest cross-sectional dimension. The tubes are preferably rigid and circular in cross-section, and the passageways defined between the tubes also have a substantially greater length than the largest cross-sectional dimension. The accumulator can either be a low pressure accumulator or a high pressure accumulator. With a high pressure accumulator it is desirable to provide a float switch or like sensor to ensure that the tubes within a tube bundle are always fully immersed in oil.

Abstract: A method and apparatus are provided for effecting prestreaming and deaeration of wood chips, or like comminuted cellulosic fibrous material. Presteaming takes place in a vertical presteaming vessel, utilizing a plurality of uniformly radially spaced nozzles adjacent the bottom of the vessel, a plurality of generally uniformly radially spaced steam introduction pipes in a central portion of the vessel, and a pair of synchronized rotating valves for feeding steam to the introduction nozzles and pipes in a coordinated manner. After presteaming, the chips pass through a chips meter to a vertical chute in which they are entrained in liquid, and then pass to a horizontal deaerating vessel. In the deaerating vessel, deaerated liquid is passed in a path generally perpendicular to the path of the material flowing through the deaeration vessel.

Abstract: An endless sieve band or composite band for paper machines and the like, has a plurality of helixes composed of an elastic wire and each having two opposite winding legs and also two head curves connecting the winding legs with one another and having a predetermined wire diameter and wire width, wherein the helixes are arranged so that when the head curve of one of two neighboring helixes is inserted into an intermediate space of another of the two neighboring helixes an overlapping region is formed into which an insertion wire is introduced, and the winding legs of each of the helixes include a supporting winding leg which has flat supporting sufaces with a width exceeding the wire diameter or the wire width of the head curves.

Abstract: A method and apparatus for treating a pulp suspension in the manufacture of paper employing a controlled drainage thickener and a screw type pulp press. Pulp is fed into the thickener where the feed screw contained therein delivers it to a vertical discharge column. A screw type conveyor delivers the pulp suspension from the vertical discharge column into a vertical inlet column associated with a screw type pulp press. A sensing means is provided to measure the consistency of the pulp entering the press, and a sensing means provides a control signal which is arranged to modulate operation of a discharge valve on the thickener to keep the consistency of the pulp entering the screw type pulp press within a predetermined range.

Abstract: A roll comprising a hollow metal core member, an intermediate base layer or layer, and a polyurethane cover, the intermediate base layer compounded to have improved thermal conductivity. The intermediate base layer or layers having improved thermal conductivity function to dissipate heat generated by hysteresis (deformation energy), thereby permitting the rolls to operate at higher roll speeds and higher pressures without roll failure.

Abstract: A threading system for threading a lead end of a web along a processing path in a papermaking machine includes an endless looped belt having a fabric base and a soft elastomeric outer surface with a transversely extending gripping slot in the surface. The slot has a round at the base and the sides of the slot are pinched together when the carrier belt extends along a straightline and with the sides separating when the carrier belt is wrapped over a roll so that the lead end of a web can be gripped in the slot for threading a web and automatically released when the sides of the slot are separated as the belt is wrapped over a roll.

Abstract: A dryer felt comprising a plurality of spiral coils disposed in a common plane and arranged in a side-by-side relationship with adjacent coils being intermeshed and joined together in a hinged relationship by a hinge yarn of non-circular cross section. During manufacture, the fabric is subjected to a heat treatment under controlled tension to cause the spiral coils, which are normally circular or oval in cross section, to assume the shape of the non-circular stuffer yarns which are typically of elliptical, D-shape, dog bone or two or more rectangular circular cross section yarns with the long side of the stuffer yarn lying in the plane of the fabric. In this way, the air voids within the fabric are substantially filled by the hinge yarns to reduce permeability, while the flattened spiral coils provide smooth paper-receiving and machine roll contacting surfaces on the resultant dryer felt.

Abstract: Dewatering and homogenizing apparatus comprising a screw thickener at the discharge end provided with a plug forming means actuated by pulling means. At the thickener's discharge end there is also mounted a hood for receiving dewatered pulp and with supply means for homogenizing agent.

Abstract: A screw thickener to be used for dewatering fibrous materials and being provided with a stuffing means at the discharge end. Said screw thickener having a hydrostatic superpressure of at least 10 kPa and said stuffing means being actuated by pulling means.