There is provided a paper machine, characterized by a press device (30) including a press mechanism (11, 21) which pressurizes wet paper (W) to squeeze water therefrom, and a pair of endless paper conveying belts (10a, 10b; 20a, 20b) for pinching and conveying the wet paper (W) as well as absorbing water squeezed from said wet paper (W), and a polishing device (40) having a polisher (51) to polish the wet paper contacting face of a belt (20b) in order to control the surface smoothness of the wet paper contacting face of the belt (20b) on the return side of at least one of the paper conveying belts (20b) at such a position that the wet paper contacting face of the belt (20b), which is running, can be polished. The paper machine maintains a smooth wet paper contacting face of a paper conveying belt and a good paper peeling performance.

Die Erfindung betrifft eine Maschine zum Herstellen einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn aus einer Faserstoffsuspension oder zum Veredeln oder Weiterverarbeiten der Faserstoffbahn (1), die dadurch gekennzeichnet ist, dass in der Maschine mindestens eine Anordnung (9) zum Aufbringen von mindestens zwei in Längsrichtung voneinander beabstandeten Markierungen auf die Faserstoffbahn (1) und eine in Bahnlaufrichtung der Faserstoffbahn (1) der Anordnung (9) nachgeordnete, insbesondere berührungslose, Messeinrichtung (10) zum Messen des Abstands der Markierungen angebracht ist.

A method of preventing the raveling of the surface of a paper body in a paper making step, particularly in a press part and a dry part, of a paper machine, and a mold releasing agent used for the method and capable of effectively preventing the raveling of the surface of the paper body, the method wherein the mold releasing agent is provided to the member of the paper machine in direct contact with the paper body in the press part and/or the dry part of the paper machine to prevent the raveling of the surface of the paper body when the paper body is separated from that member to lower a surface strength.

The method is also applicable to a wire part. Since the suitable mold releasing agent is provided to the member in direct contact with the paper body in the press part and the dry part of the paper machine, the raveling of the surface of the paper body can be prevented to prevent the lowering of the surface strength of the paper body.

Eine Dichtungseinrichtung (10) für eine Papiermaschine zur seitlichen Abdichtung einer Befeuchtungszone (12), in der eine bewegte Bahn (14), insbesondere Papier- oder Kartonbahn, mittels einer Befeuchtungseinrichtung (16) beaufschlagbar ist, umfasst wenigstens ein in Bahnlaufrichtung (L) vor und wenigstens ein in Bahnlaufrichtung (L) hinter der Befeuchtungszone (12) angeordnetes Dichtelement (20), das der bewegten Bahn (14) gegenüber liegt und sich quer zur Bahnlaufrichtung (L) erstreckt. Dabei kann zumindest ein Dichtelement (20) vorgesehen sein, das wenigstens eine Luftdüse (22) umfasst.

A drying section for a paper making machine. The drying section includes a plurality of single-tier dryer groups, optionally followed by one or more double-tier groups. To control curl in the final paper product, a moistening device extending over the width of the drying section is provided near the end of the single-tier dryer groups. The moistening device can be divided into various zones to control the profile of the paper. Alternatively, or in addition to the moistening device, a contact-less dryer such as a infrared dryer can be provided after the dryer section, upstream of a calender section of the paper making machine. The moistening device can be provided to moisten the bottom or, optionally, the top side of the paper web. Where a double-tier dryer group is provided, to control curl the upper drying cylinders and the lower cylinders can be provided with different steam pressures to control curl. Alternatively, each of the cylinders can be individually controlled.

The specification discloses a steambox for assisting in the drying of sheet material. The steambox (10) has a means (64) for preventing steam which condenses inside the steambox plenum from dripping onto the sheet. The steam is jetted from the plenum (32) toward the sheet (8) through a single cross-directionally oriented slot (46) to decrease entrainment of ambient air and thereby increase healing efficiency.

Apparatus including a first transducer and a plurality of second transducers is employed to measure the speed of ultrasound in a moving web of paper. A hollow cylinder has electronic circuitry in its interior and the first and second transducers are disposed in the cylinder and have portions which protrude above the surface of the cylinder for contact with the web. The interior circuitry includes means (16) for conditioning the power supply to reduce electrical noise and means (20) for sending electrical pulses to the first transducer. The first transducer (30) delivers corresponding ultrasonic pulses to the web that propagate through the web and are received by the second transducers (40) which then deliver corresponding electrical signals to the interior circuitry of the cylinder. These signals correlate with the speed of ultrasound in the web and may be communicated to receptors which are external to the cylinder.

Apparatus including a first transducer and a plurality of second transducers is employed to measure the speed of ultrasound in a moving web of paper. A hollow cylinder has electronic circuitry in its interior and the first and second transducers are disposed in the cylinder and have portions which protrude above the surface of the cylinder for contact with the web. The interior circuitry includes means (16) for conditioning the power supply to reduce electrical noise and means (20) for sending electrical pulses to the first transducer. The first transducer (30) delivers corresponding ultrasonic pulses to the web that propagate through the web and are received by the second transducers (40) which then deliver corresponding electrical signals to the interior circuitry of the cylinder. These signals correlate with the speed of ultrasound in the web and may be communicated to receptors which are external to the cylinder.

To provide an easily maintainable spraying apparatus.

The present invention is directed to a spraying apparatus 100 including: a nozzle device 1 including nozzle sections 1a and 1b for spraying a fluid; tubes 2a and 2b via which the fluid is supplied to the nozzle sections 1a and 1b; a cableveyor 3 whose hollow portion 3a accommodates the tubes 2a and 2b; a base 10 to which the nozzle device 1 is attached; a drive transmission section 11 to which the base 10 is attached; a drive section 12 that drives the drive transmission section 11; and a chassis 20 that accommodates the cableveyor 3 and the drive transmission section 11, wherein the drive transmission section 11 and the cableveyor 3 are provided next to each other so as not to vertically overlap each other, and the drive section 12 drives the drive transmission section 11 so that the nozzle device 1 moves via the base 10.

The invention relates to a dust-handling device (1) for collecting and handling dust in a paper-making environment wherein the dust-handling device (1) comprises a source of underpressure (2) and an elongated collector (3) that extends along a longitudinal axis. The elongated collector (3) is connected to the source of underpressure (2) such that underpressure can be generated inside the elongated collector (3) and the elongated collector (3) has an inlet (5) through which dust-laden air can enter the elongated collector (3) and an exit opening (6) through which dust-laden air can be evacuated from the elongated collector. The inlet (5) of the elongated collector (3) is disposed in such a relation to the longitudinal axis of the elongated collector (3) so that upon drawing the dust-laden air into the elongated collector (3), an air vortex is induced with the dust-laden air wherein the induced air vortex flows between the collector inlet (5) and the collector exit opening (6). A source of water (7) is connected to the elongated collector such that water can be introduced into elongated collector (3) so that dust of the dust-laden air can be exposed to and mix with the water introduced into the elongated collector (3). According to the invention, a dust removal device (8, 10) is mounted on the elongated collector and arranged to act against the inlet (5) to remove dust that has clogged the inlet (5).The invention also relates to a method in which dust clogging the inlet (5) is removed.

It is a subject to provide a nozzle device capable of effectively spraying air and capable of applying chemical solutions to a traveling body at a high deposition rate. For solving the subject, the present invention is a nozzle device 100 for applying a chemical solution Y to a traveling body 50 in a paper machine 101, the nozzle device 100 comprising a nozzle main body portion 2 having a chemical solution nozzle opening 1 capable of discharging the chemical solution Y, and an air main body portion 10 capable of spraying air from both sides of the nozzle main body portion 2 so as to put the discharged chemical solution Y between, wherein the air main body portion 10 includes an air introducing passage 13 for introducing air, a pair of front and rear flow passages 14 communicating with the air introducing passage 13 and a pair of air nozzle openings 12 communicating with each of the flow passages 14 for discharging air, and wherein a relationship between a cross-sectional area SA of the air introducing passage 13 and cross-sectional areas SB of the air nozzle openings 12 satisfies