Abstract: Disclosed is a through-air dryer shower assembly disposed within the through-air dryer and enables efficient cleaning of the through-air dryer without having an operator enter the dryer. The shower may comprise an elongated shower conduit having a plurality of nozzles disposed thereon and may be affixed to a baffle disposed within the through-air dryer cylinder. The shower assembly is generally positioned to spray a pressurized stream of wash fluid against the interior surface of the dryer causing debris accumulated within the deck to flow through the structure to the outer surface for discharge.

Abstract: Provided herein is a molding material that attains little fluctuation in amount of short fibers and powdery resin among individual products and that allows continuous production without damaging a die. In the step of pouring, slurry is poured onto a slurry diffusion member 7 from above the slurry diffusion member 7. The slurry diffusion member 7 extends in an upward direction, and is shaped such that the area of a transverse section taken along a direction orthogonal to the upward direction becomes smaller as the slurry diffusion member 7 extends in the upward direction. In the step of cleaning, a dispersion medium that is the same as the dispersion medium used in the step of pouring or water is poured onto the slurry diffusion member 7 from above the slurry diffusion member 7 to cause the short fibers and the powdery resin adhering to a slurry diffusion portion 71 of the slurry diffusion member 7 to fall down.

Abstract: There is little fluctuation in amount of short fibers among individual products of fiber substrate. No damage is caused to a mold for the fiber substrate. Continuous production of the fiber substrates is possible. A method of manufacturing a fiber substrate includes the steps of: preparing slurry by dispersing short fibers in a dispersion medium; pouring the slurry into a cylindrical mold from above the cylindrical mold, the slurry being directed to a slurry diffusion member disposed in the center of the cylindrical mold and having an upward pointing conical or pyramidal shape; pouring the dispersion medium or water onto the slurry diffusion member from above the slurry diffusion member to cause the short fibers adhering to the slurry diffusion member to fall down, after the step of pouring the slurry; and discharging the dispersion medium from the cylindrical mold to accumulate the short fibers in the cylindrical mold to obtain a fiber aggregate.

Abstract: The invention relates to an arrangement arranged to introduce a three-dimensional structure in a paper during production of said paper in a paper making machine (1). The arrangement comprises a heat roll (14) arranged to dry a wet paper web and an extended nip roll (12) arranged to form a transfer nip (TN) with said heat roll (14). The extended nip roll (12) is provided with a flexible jacket (17) arranged around the circumferential area of said extended nip roll (12). An external surface of said flexible jacket (17) is provided with a textured portion (15) and when the wet paper web passes the transfer nip between said extended nip roll (12) and said heat roll (14), said textured portion (15) of the external surface of the flexible jacket (17) will impart a three-dimensional texture to the paper web.

Abstract: Roll, method of forming roll and method of operating roll. Roll includes a roll body, a deformable cover coupled to the roll body, a pluggable input, a pluggable output, and a coolant contained within the roll body at least in an amount sufficient for a rimming mode to occur during normal operation of the roll. The present abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: A drum type paper stock refine screen is provided which is capable of efficiently filtering a refined paper stock to the outside of a laterally suspended rotary drum and efficiently discharging foreign matter to the outside of the drum while rotating the drum. The drum type paper stock refine screen includes a lower water infiltration zone formed by infiltrating a lower circular part on one end side of a laterally suspended rotary drum in a water tank, a non-water infiltration zone continuous with the lower water infiltration zone on the other end side of the rotary drum, and a paper stock injection port for injecting a paper stock in the lower water infiltration zone.

Abstract: An air delivery device is provided for dewatering a suction roll in a paper machine by applying pressurized air to expel residual water or debris outwardly from through-holes. The air delivery device is positioned at a suitable circumferential position of the suction roll to prevent water carryover back to the suction box location. In one preferred embodiment, an internal blowbox is mounted near the inner surface of the suction roll for blowing out water from the suction roll holes to augment the natural centrifugal forces. The blowbox can be used as a standalone dewatering unit, or in conjunction with an external doctor blade or wipe. In another preferred embodiment, at least one air knife, air pipe or air shower is used for dewatering. In another preferred embodiment, at least one interior stationary air foil is used to generate a pressure pulse which creates outward air flow through the through-holes.

Abstract: The invention relates to a doctor apparatus (10) in connection with a roll (T) in a paper or board machine. The doctor apparatus (10) comprises a doctor beam (12) of lightweight construction and that the doctor beam (12) is arranged to pivot on bearing means (13a1, 13a2 . . . ) (pivot movement arrow L1). In connection with the doctor beam there are loading members (14a1, 14a2), a relative linear movement taking place between the loading members (14a1, 14a2) and backup surfaces (12′, 15a′) when the doctor beam (12) is being oscillated.

Abstract: A method is disclosed for cleaning roll surfaces on a paper-making machine or the like, particularly the grooves and drilled perforations of the rolls, and/or supported fabrics and/or for improving water drainage therein. According to the method, the properties of a moving roll surface (1) and/or fabric (6), as well as their behavior during a run, are affected by means of a gas mixture (5) in a manner, wherein the flow of the gas mixture is caused to be directed substantially toward the roll surface (1), grooves (2) made on the roll shell, perforations (2) of the roll shell and/or the fabric (6) or, alternatively, at least to a close proximity of at least one of the foregoing objects. The invention also relates to an apparatus suited for implementing the method.

Abstract: A doctor system (20) and an associated method for cleaning the moving surface (30) of a papermachine component (22) which is begrimed or wetted by a paper web (28) moved around the surface utilizes an air nozzle (54) supportable in a stationary condition adjacent the surface of the papermachine component for directing a stream of air in the form of a knife from a source generally toward the surface to dislodge grime and water from the surface. The system also includes a collection receptacle (68) positionable adjacent the nozzle for collecting grime and water which are dislodged from the surface by the air knife for disposal.

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: A method and device for conditioning a ceramic or metal-ceramic coating of a paper machine roll at its operating site. The roll is ground periodically by a grinding member mounted on a doctor of the roll. The grain size of the grinding particles in the grinding member, i.e., the average diameter of the particles, is in the range of from about 15 to about 200 .mu.m. In the grinding situation, the roll is rotated in its site of operation, and the grinding member is pressed with a force into contact with the face to be ground, whereby, if the face to be ground is excessively rough, it is smoothed to the desired value of surface roughness and, in a corresponding manner, an excessively smooth face is roughened to the desired surface roughness value determined by the grinding member.

Abstract: Aqueous compositions and process aids useful in paper processing for quenching optical brighteners, particularly under alkaline paper production conditions. The process aids are aqueous compositions comprising (a) an acid addition salt or quartenization product of a cyclic amidine, (b) a polyethyleneimine and optionally (c) an acid. The aqueous compositions and process aids may be added to paper feedstocks in paper production apparatus or to paper production apparatus absent a paper feedstock.

Abstract: The device consists of a scraper consisting of a unit of two parallel blades (1) and (2) that diagonally incide on the surface of the roller or cylinder.The separation space forms a forced water circulation chamber with inlets (7) and outlets (8) that cool and lubricate the blades and clean away impurities.

Abstract: An apparatus is disclosed for cleaning a porous cover of a press roll of a papermaking machine. The apparatus includes a hydrostatic bearing disposed adjacent to the porous cover, the bearing defining a concave surface for cooperating with porous cover. The bearing defines a fluid conveying passageway having a first and a second end. The first end of the passageway is connected to a source of pressurized fluid and the second end is in fluid communication with the concave surface such that in use of the apparatus, when the porous cover of the press roll rotates, the fluid passes through the passageway and along the concave surface and between the concave surface and the porous cover. The pressurized fluid flow inwardly through the porous cover for flushing contaminants lodged within the porous cover outwardly away from the porous cover thereby inhibiting the buildup of comtaminants on the external surface of the porous cover that would otherwise impair the water absorbing capabilities of the cover.

Abstract: A method for preventing plugging of a suction roll of a paper machine is described, which includes showering sealing water having incorporated therein from 10 to 500 ppm by weight, based on the sealing water, of malic acid on an inner wall of a shell of the suction roll.

Abstract: The invention relates to shower fittings especially those used in the paper and board making industries. The shower fitting incorporates at least one jet for directing on to a surface a jet of liquid which is suitable for cleaning and/or reconditioning the surface. The jet or jets are normally mounted in a tube to which the liquid is supplied and which is reciprocated across the surface to ensure that the entire width of the surface is treated and to avoid damage to the surface that might result if a jet of liquid is directed constantly at the same area of the surface. The invention is concerned with the problem of ensuring adequate support and protection for the tube. In one particular embodiment, the tube 1 is mounted for reciprocation inside a support tube 3. Support bushes 2 spaced along the axial length of the tube 1 ensure adequate support while protection is provided by the outer tube 3.

Abstract: Paper forming roll comprising: a stationary pressure box; a rotatable foraminous shell extending around the box; paper making wire; spacing members extending between the box and shell, the spacing members being secured to the box; a plurality of circumferentially extending zones defined by the box, the shell, and the spacing members; wherein a first one zone is a forming zone, a second zone is a primary holding zone, a third zone is a transfer zone, and at least a fourth zone is a secondary holding zone; the box including a plurality of external and internal walls defining a plurality of pressure chambers, a first one of the external walls including ports providing communication between the forming zone and a first one of the pressure chambers from which vacuum for forming purposes may be achieved, a second one of the external walls extending generally vertically from one end of the first one of the external walls to partially define the primary holding zone, the generally vertical wall also including ports p

Abstract: A continuous machine for the manufacture of fiber-containing materials such as paper, which comprises a rotating cylinder partly immersed in a body of liquid containing fibers in suspension. The surface of the cylinder comprises permeable and impermeable areas arranged in a predetermined pattern, and fibers are drawn onto the permeable areas by suction from within the cylinder, the layers of fibers formed on these areas being transferred to a conveyor belt which contacts the cylinder surface at a zone out of contact with the liquid. The surface of the cylinder is washed upstream of the transfer zone to remove fibers and other particles which may adhere to the impermeable areas of the cylinder surface by feeding cleansing liquid, such as pure water, across an overflow edge into a space adjacent the cylinder so that the cleansing liquid flows parallel to the impermeable areas.

Abstract: A foraminous multi-zone wire mesh covered suction roll useful in a papermaking machine and in a multi-cylinder paper-making machine wherein the roll is divided into at least four discrete zones by generally radial divider elements and wherein at least a first zone collects water, a second zone is in an area where transfer of the wet ply takes place to a continuous carrier, a third or transition zone carries excess water in the wire mesh away from the second zone to a fourth water release zone, and wherein the carrier is intimately associated with the roll and formed ply in an area subtended by the projection of the spaced divider elements defining the second or transfer zone so that the formed wet ply in this area is in contact with the wire mesh covering the suction roll on one side and in contact on its other side with the continuous carrier and so the formed wet ply in this area is between this wire mesh and the carrier.