Abstract: Disclosed herein are cylinder forming apparatuses for making nonwoven webs. In one embodiment, a cylinder forming apparatus has a first source configured to dispense a first fluid flow stream, and a second source configured to dispense a second fluid flow stream, wherein at least the first fluid flow stream comprises a fiber; an arcuate mixing partition downstream from the one or more sources, the arcuate mixing partition positioned between the first and second flow streams, the apparatus defining one or more openings that permit fluid communication between the two flow streams; and a cylindrical receiving region situated downstream from the sources and proximal to the first flow stream and designed to receive at least a combined flow stream and form a nonwoven web by collecting fiber from the combined flow stream. Methods of using the apparatuses are also disclosed.

Abstract: Apparatus and method for producing absorbent structures with absorbent layers with channel(s) without absorbent material, using a first moving endless surface with specific raised strip(s) and a second moving endless surface with specific mating strip(s).

Abstract: An apparatus for manufacturing security paper, comprising at least one main forming roller, which is provided with a lower portion or forming portion, which is arranged inside a forming box that contains a paper paste, an upper portion or deposition portion, which is arranged below a collecting wire that can move along an advancement direction and is designed to receive, at a collecting face, the sheet formed on the forming roller, and a device for depositing security elements that is arranged upstream of the main forming roller along the advancement direction of the collecting wire and is adapted to deposit the security elements at the collecting face.

Abstract: An apparatus for use in a cylinder machine having a shoe with a concavely-shaped pressure surface that forms a substantially mating relationship with a cylinder mould or sieve. The concavely-shaped pressure surface of the shoe increases the amount of wrap that a making fabric has on a cylinder mould or sieve thereby increasing the amount of friction generated between the making fabric and the cylinder mould or sieve. The increased friction results in an improved torque transfer between the making fabric and the cylinder mould or sieve.

Abstract: A method and an apparatus for continuously drawing superheated vapor through a moist web as the same is being formed and pressed at a porous peripheral surface of a rotatable hollow cylinder, thereby allowing to have web drying in a compact apparatus permitting recycling of heat. The extracted moisture is transformed in superheated vapor and again used in the drying of incoming web.

Abstract: A process for thickening a fibrous pulp suspension by guiding the suspension between a rigid first face and a flexible second face that move in relation to each other and form a converging draining gap, where the first face and/or the second face is/are water permeable, and where the process includes providing the suspension to be drained, forming from the suspension a fibrous pulp layer with a solid matter content of at least about 4% on at least one of the first face and the second face, guiding the fibrous pulp layer into the draining gap, applying a pressure differential in the draining gap via the second face to thicken the fibrous pulp layer, the pressure differential being formed by stretching the second face and pressing the first face and the second face toward each other to drain water from the fibrous pulp layer, and transporting the thickened fibrous pulp from the draining gap.

Abstract: Apparatus and method for thickening a suspension of solid particles in liquid employs three rolls ranged in spaced relation with their axes defining a triangle, and a single loop of wire is trained around and in wrapping relation with all three rolls. With one exception, each of the rolls has in combination therewith a headbox which delivers a flow of the suspension to be thickened in such manner that it is trapped between the wire and the portion of the roll wrapped by the wire so that the trapped suspension is dewatered and concentrated by expression of liquid through the wire. The pulp deposited on the inside of the wire at each of the stations comprising a roll and headbox is ultimately collected from the surface of the one roll having no headbox and is transported out from within the space within the wire loop.

Abstract: Embodiments of apparatus for thickening a liquid suspension of solid particles, such as papermaking pulp in water, include a pair of spaced apart rolls and a woven wire or plastic wire belt trained around these rolls. The suspension is supplied to the apparatus at the first roll for centrifugal extraction and is carried by the belt to the second roll for further water extraction and thickening, and is then discharged from the apparatus. In one embodiment, the first roll is formed with an open surface, and the suspension is delivered to the web at least partially by flowing through the first roll openings, from either a headbox in the on-running wedge zone or a headbox internal to the rolls to deliver stock outwardly through the roll.

Abstract: A method for thickening a liquid suspension of solid particles, such as papermaking pulp in water, uses a pair of spaced apart rolls and a woven wire or plastic wire belt trained around these rolls. The suspension is supplied at the first roll for centrifugal extraction and is carried by the belt to the second roll for further water extraction and thickening, and is then discharged from the apparatus. In one embodiment, the first roll is formed with an open surface, and the suspension is delivered to the web at least partially by flowing both into and out a roll chamber via the first roll openings, from a headbox in the on-running wedge zone.

Abstract: A papermaking machine is constructed as a barrier former in which a fiber slurry is received and placed in turbulence on one side of the screen plate for fluidizing the slurry and distributed through the screen plate onto a collecting wire, under tension, for immediately starting dewatering of a web formed in a wedge-shaped forming zone between the screen plate and the wire.

Abstract: A method of, and washing machine or washer for, washing stock suspensions, wherein a rotatable cylinder having a solid smooth surface is encircled along a portion of its circumference by a movable endless wire or filter band. The stock suspension to be dewatered and washed is infed by a flat jet nozzle between the rotatable solid cylinder and the movable endless wire. The fiber web formed between the rotatable solid cylinder and the movable endless wire has a weight of less than 100 grams per square meter, preferably 30 to 70 grams per square meter. The wire speed and the circumferential speed of the rotatable solid cylinder is in the order of about 400 to 1,200 meters per minute. After through-flow of the stock suspension between the rotatable solid cylinder and the movable endless wire, the dewatered and washed fiber material is removed from the movable endless wire and the rotatable solid cylinder, respectively, collected in a collecting container and delivered for further processing.

Abstract: A vat paper machine is disclosed, said machine including a cylinder-vat unit having a rotatable cylinder mold, a vat and a headbox for providing a continuous supply of stock to the vat. The vat is arranged upstream of the cylinder mold in such a manner that the wire-covered cylinder mold is brought into contact with stock in the vat to form a first web by draining water from the stock through the wire-covered surface of the mold. An outer wire is also provided which runs in a loop over a breast roll, through the vat along its bottom wall and then over and around a portion of the circumference of the cylinder mold. The portion of the bottom wall of the vat which is located between the breast roll and the cylinder mold includes a platform supporting the outer wire. The platform is provided with slit means that form one or more drainage passages which serve to form a second web on the outer wire.

Abstract: A wire machine, especially for washing stock suspensions, contains one or a number of dewatering cylinders about which there is trained an endless wire or filter band. There is provided at least one stock infeed device which infeeds a substantially flat jet of the suspension which is to be dewatered into a substantially wedge-shaped space or throat located between the wire band and the dewatering cylinder. The dewatering cylinder has a longitudinal axis which is essentially vertically arranged. There are possible different arrangements of the dewatering cylinder or cylinders, the stock infeed devices and material removal devices for removing from the rotatable dewatering cylinder solid constituents or the like contained in the stock suspension. Also there are possible different arrangements and uses of guide rolls for guiding the wire or wire band.

Abstract: A method of, and wire machine for, washing stock suspensions is disclosed wherein a cylinder having a solid smooth surface is encircled along a portion of its circumference by an endless wire or filter band. The stock suspension which is to be dewatered is infed between the solid cylinder and the wire by means of a flat jet nozzle. After throughflow of the stock suspension between the cylinder and the wire the dewatered fiber material is removed from the wire and the cylinder, respectively, collected in a collecting container and delivered for further processing.

Abstract: The papermaking machine contains an endless inner dewatering band which extends or wraps with its inner side or surface around two series or successively arranged sections of dewatering surfaces. In each wrap-around section thus defined the inner dewatering band is convergently guided or brought together with a portion of a respective endless outer dewatering band towards an infeed throat or gap and a dewatering section following the same. From each dewatering section the associated outer dewatering band is returned towards its related infeed throat or gap. Two headboxes each of which is directed towards a related one of the infeed throats or gaps are provided, so that there are formed two fiber layers or plies which are to be joined. To achieve a compact and simple construction the series or successively arranged sections of the dewatering surfaces are formed at a common dewatering element which is centrally arranged relative to the infeed throats or gaps.

Abstract: A paper making machine contains a filter or screen cylinder and an external filter or wire guided over guide rolls, the external filter or wire being trained about the filter cylinder. The stock suspension is introduced by means of a free jet-headbox between the cylinder and the external filter, into an essentially linear portion of the external filter or wire, if desired while carrying out a dewatering operation. The removal of the fiber web or fleece is accomplished directly from the filter cylinder on to a felt web.

Abstract: A former for a paper machine: The paper machine includes a perforated forming cylinder and a suction device for drawing water inward through the perforations. An inner and an outer belt are wrapped around the forming cylinder. The outer belt meets the inner belt at the peripheral surface of the forming cylinder in a generally wedge-shaped inlet slot located at and upstream of the bottom of the forming cylinder. A pulp fiber suspension nozzle of a width that covers the axial length of the forming cylinder injects pulp into the inlet slot. A supporting device is provided at the inlet slot and includes a convexly curved surface, convexly curved around an axis generally parallel to the cylinder axis. The supporting device includes a concavely curved surface that follows the convexly curved surface downstream of the flow of pulp. A suction device communicates with the concavely curved surface beneath the outer belt. The outer belt rides over the convexly curved surface and down onto the concavely curved surface.

Abstract: A paper making machine including a hollow cylinder rotatable in a predetermined direction having a porous surface, a mesh wrapped around the cylinder, an outer band partially surrounding the cylinder and together with the mesh forming an inlet aperture, a nozzle for spraying suspended matter into the aperture, and a housing formed with a plurality of chambers disposed and open on a side facing the cylinder surrounded by the outer band, successive chambers in the direction of operative rotation of the cylinder being increasingly pressurized, the entire inner surface of the cylinder being subjected to a uniform pressure smaller than the pressure exerted on the part thereof surrounded by the outer band.

Abstract: A web-forming method and apparatus particularly suited for cellulose pulp. The web is initially formed on a rotary wire cylinder which has a horizontal axis and a crest situated at the highest part of the cylinder over the horizontal axis, the cylinder during rotation thus having an upwardly travelling side which turns upwardly toward the crest and a downwardly travelling side which turns downwardly from the crest. At the upwardly travelling side of the cylinder is a headbox having its slice situated adjacent the crest for projecting onto the rotating cylinder a pulp slurry jet at a speed greater than the peripheral speed of the cylinder, so that the deposited pulp slurry will start to form a web while turning with the cylinder up to and then downwardly from the crest thereof. An outer wire has a portion wrapped partially around the cylinder, through an angle of at least 180.degree.

Abstract: A wire is passed over the suction breast roll between the formed paper web and the doffer belt or the previously formed paper webs and doffer belt. The doffer felt is disposed in an unencumbered fashion over each of a plurality of consecutive suction breast rolls. The wire is removed from the web at a downstream point outside the dewatering influence of each breast roll. Stripping of the wire from the paper web is aided by various suction devices or couch rolls at this latter point.

Abstract: A combination-paper machine, especially one for the continuous manufacture of thick paper, cardboard or the like, is disclosed as having two perforated cylinders which form a combining space or slit between them, devices for feeding pulp suspension onto the perforated cylinders prior to the combining point, whereby an endless wire is guided along at least that surface of each perforated cylinders which is between the pulp suspension feeding point and the combining point, the pulp suspension feeding devices including two roof-like upper lips which cover at least part of the wire-covered surface of each perforated cylinder prior to the combining point. The roof-like upper lips are mutually separate and independent, the combining space is slightly greater than the thickness of the completed web, and after the combining point both the wires are guided to run over a certain distance along the surface of one and the same perforated cylinder.