Abstract: In a twin-wire former for the production of a paper web, two wire belts (11 and 12) together form a twin-wire zone which is divided into three sections (I, II and III). In the first section (I) the two wires (11, 12) travel over a curved forming shoe (16). They form there a wedge-shaped inlet slot (15) with which a headbox (10) is directly associated. In the second section (II), several resiliently supported strips (27) rest against the lower wire (11) and between each of said strips (27) a rigidly mounted strip (28) rests against the upper wire (12). In the third section (III) both wire belts (11, 12) pass over another curved forming shoe (23).

Abstract: In a twin-wire former for the production of a paper web, two wire belts (11 and 12) together form a twin-wire zone which is divided into three sections (I, II and III). In the first section (I) the two wires (11, 12) travel over a curved forming shoe (16). They form there a wedge-shaped inlet slot (15) with which a headbox (10) is directly associated. In the second section (II), several resiliently supported strips (27) rest against the lower wire (11) and between each of said strips (27) a rigidly mounted strip (28) rests against the upper wire (12). In the third section (III) both wire belts (11, 12) pass over another curved forming shoe (23).

Abstract: The invention is directed to a paper making machine having a wet end associated with a wet fiber web. A forming fabric has a plurality of voids therein and carries liquid from the fiber web. A roll disposed at the wet end of the paper making machine carries the forming fabric. The roll and the forming fabric define a diverging area therebetween which causes liquid in the forming fabric to exit the voids. A doctor back includes a doctor element associated with the roll. A shower provides a liquid output which is directed relative to and lubricates the doctor element. A suction chamber has an at least partially open top and an outlet. The open top is positioned relative to each of the doctor blade and the diverging area to collect liquid from the shower and liquid exiting the voids in the forming fabric in the diverging area. A cyclone separator connected to the suction chamber receives liquid from the suction chamber outlet.

Abstract: The invention is directed to a wet end assembly disposed at a wet end of a paper making machine for forming a fiber web from a fiber suspension. A headbox including a plurality of inner walls defines a chamber. The headbox further includes an inlet in communication with the chamber for receiving the fiber suspension and a discharge nozzle in communication with the chamber for discharging the fiber suspension. The headbox further includes structure, engaged with the inner walls, for selectively and adjustably compensating for deflections of the inner walls. A former includes a moving top endless wire and a moving bottom endless wire, with the top endless wire and the bottom endless wire defining a converging gap therebetween. The converging gap has an entrance end positioned adjacent the discharge nozzle for receiving the fiber suspension therefrom. A press section includes a suction roll carrying an endless belt.

Abstract: In a twin-wire former for the production of a paper web, two wire belts (11 and 12) together form a twin-wire zone which is divided into three sections (I, II and III). In the first section (I) the two wires (11, 12) travel over a curved forming shoe (16), or a forming roll (40). They form there a wedge-shaped inlet slot (15) with which a headbox (10) is directly associated. In the second section (II), several resiliently supported strips (27) rest against the lower wire (11) and between each of said strips (27) a rigidly mounted strip (28) rests against the upper wire (12). In the third section (III) both wire belts (11, 12) pass over another curved forming shoe (23).

Abstract: The invention is directed to a shoe press for removing water from a traveling fiber web. The shoe press includes a planar backing surface, and a shoe assembly disposed adjacent to the backing surface. The shoe assembly and the backing surface form a press nip therebetween extending in a running direction of the traveling fiber web. Four felts extend through the press nip and carries the fiber web through the press nip. The shoe assembly includes a plurality of shoes disposed adjacent to each other in the running direction of the fiber web, with each shoe being configured to apply a selected and independent compressive force against the at least one felt and the fiber web.

Abstract: The dry end of a paper machine comprises a first dryer group with top drying cylinders, with a first drying wire and with bottom deflection suction rolls. Adjacent this, there is a second dryer group with bottom drying cylinders, with a second drying screen and with top deflection suction rolls. In this way, both sides of the web to be dried come, in succession, into direct contact with the drying cylinders. At the place where the web changes from the first drying wire to the second drying wire, there is a transfer suction roll which lies within the loop of the second support belt. The web travels there from the last cylinder of the first dryer group over an at least approximately straight travel path to the transfer suction roll and thus onto the second support belt.

Abstract: The present invention relates to a dryer section of a machine for the production of fibrous web, such as a paper web. The dryer section comprises at least one dryer group having at least one drying cylinder and an endless porous support belt that guides the web around each cylinder. This is followed by a reversing roll being formed as a suction roll. With the web being supported by said porous support belt the web directly contacts said reversing roll. A distance of at least 150 mm is provided between the cylinder and the reversing roll. A sealing strip extends transversely over and close to the inner side of the endless porous belt in the region where web and belt are traveling off the cylinder. For deflecting the air boundary layer which arrives together with the belt, a sealing support beam also extends transversely over the inner side of the belt and supports the sealing strip.

Abstract: In a twin-wire former for the production of a paper web, two wire belts (11 and 12) together form a twin-wire zone which is divided into three sections (I, II and III). In the first section (I) the two wires (11, 12) travel over a curved forming shoe (16). They form there a wedge-shaped inlet slot (15) with which a headbox (10) is directly associated. In the second section (II), several resiliently supported strips (27) rest against the lower wire (11) and between each of said strips (27) a rigidly mounted strip (28) rests against the upper wire (12). In the third section (III) both wire belts (11, 12) pass over another curved forming shoe (23).

Abstract: In a twin-wire former for the production of a paper web, two wire belts (11 and 12) together form a twin-wire zone which is divided into three sections (I, II and III). In the first section (I) the two wires (11, 12) travel over a curved forming shoe (16). They form there a wedge-shaped inlet slot (15) with which a headbox (10) is directly associated. In the second section (II), several resiliently supported strips (27) rest against the lower wire (11) and between each of said strips (27) a rigidly mounted strip (28) rests against the upper wire (12). In the third section (III) both wire belts (11, 12) pass over another curved forming shoe (23).

Abstract: The dry end of a paper machine comprises a first dryer group with top drying cylinders (11 to 14), with a first drying wire (10) and with bottom deflection suction rolls (21 to 23). Adjacent this, there is a second dryer group with bottom drying cylinders (15 to 18), with a second drying screen (20) and with top deflection suction rolls (25 to 27). In this way, both sides of the web (9) to be dried come, in succession, into direct contact with the drying cylinders. At the place where the web (9) changes from the first drying wire to the second drying wire, there is a transfer suction roll (24) which lies within the loop (20) of the second support belt. The web (9) travels there from the last cylinder (14) of the first dryer group over an at least approximately straight travel path to the transfer suction roll (24) and thus onto the second support belt (20).

Abstract: A hollow shaft bearing for a drying cylinder of a paper machine. The hollow shaft bearing is provided with thermal insulation between the interior of the hollow shaft and the surface of the journal on which a bearing is supported. The insulation is formed by a coaxial annular space formed between the inside wall of the hollow shaft and the outside wall of the hollow shaft which supports the bearing.

Abstract: A twin-wire former for making a web of paper (9) having two endless loop travelling screens (11, 12) which travel over respective breast rolls (13, 14) and form a wedge-shaped feed gap of a twin-wire region. In the twin wire region the two travelling screens pass first over a curved stationary supporting device (15), then over a forming roll (16) which lies in the same screen loop (11) as the curved supporting device (15), and finally over a screen suction roll (18) which lies in the other screen loop (18). In order to form a large storage volume for water, an additional lattice-like outer shell (27) surrounded by a coarse-mesh textile filter envelope (28) is arranged on the body (16a) of the forming roll. Approximately half the periphery of the screen suction roll (18) is wrapped by the two screens (11, 12). At the end of the said wrapping zone, the one screen (11) runs off from the screen suction roll (18) followed by the other screen (12) together with the web of paper (9).

Abstract: A headbox for a paper machine with a stock channel featuring an outlet gap. The stock channel is preceded by a turbulence generator in the form of a machinewide bundle of many turbulence pipes. The turbulence generator is composed of two or three machinewide layers of turbulence pipes. The turbulence pipes of adjacent layers differ primarily by different flow cross sections, preferably also by different axial spacings a, A.

Abstract: A drying end which comprises a plurality of drying groups. Referring to FIG. 2, each drying group has its own endless support belt (171-175) which travels together with the web alternately over drying cylinders (101-138) and guide rollers. In each drying group, at least some of the drying cylinders lie in a row of cylinders (161-168) which is arranged approximately vertically. Within the first drying group (160/161) the web travels downward through a vertical cylinder row (161), the lower side of the web contacting the cylinders. In the second drying group (162/163), the web first of all travels upward, the upper side of the web contacting the cylinders. At least two drying groups have two vertical cylinder rows (162-167). Referring to these later two groups, the rows of guide rollers in one drying group are arranged outside the corresponding cylinder rows, and in the other drying group the guide rollers are arranged inside the cylinder rows.

Abstract: A guide roll for a porous belt, for instance for the drying wire of a paper machine, is described. A perforated roll shell rotates about a stationary air guide box. The guide box has two air chambers which extend across the length of the guide roll. One air chamber serves the discharge of blowing air and the other air chamber serves the intake and removal of suction air. Contained between the air guide box and the roll shell is an annular space in which a blowing zone and a suction zone are defined by longitudinal seals. Considering that blowing air and suction air may have different temperatures, the two air chambers of the air guide box are movable axially relative to each other.

Abstract: A headbox for stock suspension for a machine for forming a web from the stock suspension. The headbox having an outlet duct formed by a relatively stationary duct wall below and a relatively movable duct wall above. The duct walls converge in the direction of suspension flow to form an outlet slot. The upper duct wall is pivoted at its upstream end to enable adjustment of the clear width, i.e. the inter-wall spacing of the outlet slot. A beam extends across the machine above the movable duct wall. A pressurizable back pressure cushion is disposed between the beam and the movable duct wall. The pressure of the cushion is adjustable for maintaining the desired pressure level exerted by the movable wall on the stock suspension in the outlet slot. A lifting appliance is connected with the beam, but not with the movable duct wall, for adjusting the height position of the beam, which adjusts the width of the pressurized outlet slot.

Abstract: A nozzle-like, machine-wide stock channel forms a stock discharge opening to which is allocated a device for adjusting the basis weight cross direction (CD) profile of the paper web produced in the paper machine. The device has a profile bar extending across the machine width. This is connected to an expanding member supported at the headbox in which are arranged pressure chambers disposed in succession across the machine width. By pressurization of the chambers of the expanding member consisting of an elastic material, this can be deformed. The deformation is transferred to the profile bar and in this way the effective width of the stock discharge opening changed.

Abstract: Expanding body which is essentially designed as a hollow beam and, viewed in the cross-section, composed of several flexible walls. At least one of these walls has a higher expandability than the other walls. The internal chamber of the expanding body can be pressurized by a variable fluid pressure. On the use of such an expanding body in a paper machine headbox a wall with a relatively low expandability forms the downstream end piece of a flow guide wall. Its position, which determines the clear width of the discharge opening, is alterable by varying the internal pressure.

Abstract: The invention relates to a stationary supporting member for the drainage wire belt of a paper machine. The supporting member has a transverse head board with a doctor-like leading edge which contacts the underside of the wire belt. The head board is formed from hard material, which has a drainage area forming a small, variable angle of inclination with the direction of travel of the wire belt. Two C-beams support the head board, one secured rigidly in the machine and the other, which carries the head board, being hinged to the rigid beam. An adjusting board on the rigid beam and having several adjustable stop surfaces distributed over its length, engages stops on which the movable beam is supported. The two beams are clamped together by means of an inflatable hose between the arms of the beam.