Abstract: A system and process for producing tissue webs is disclosed. The tissue webs are formed from an aqueous suspension of fibers and dried using a through-air dryer. During formation of the web, the web is transferred from a transfer fabric to a throughdrying fabric and then conveyed around a drying cylinder of a through-air dryer. In accordance with the present invention, a pressurized roll emits a gaseous stream through a pressurized zone that pushes and transfers a wet web from a transfer fabric to the throughdrying fabric. The amount of pressure used during the transfer can vary depending upon the particular application and may be used to control the bulk of the web. By using a pressurized transfer roll, the amount the throughdrying fabric is wrapped around the drying cylinder of the through-air dryer can be maximized for increasing the efficiency of the system and the process.

Abstract: A system and method for transferring a nonwoven web in a wet papermaking process to a fabric is disclosed. The system includes a vacuum shoe that operates in conjunction with a transfer shoe. The vacuum shoe is contacted against a carrier fabric which is designed to receive the nonwoven web. The transfer shoe, on the other hand, is configured to contact a transfer fabric from which the web is transferred. The transfer shoe includes an air nozzle which contacts the nonwoven web with a pressurized gas as the web is drawn towards the vacuum shoe. The system of the present invention is particularly well suited to processing lower basis weight webs and can be used in rush transfer processes.

Abstract: A steam box including a steam chamber for blowing steam toward a paper or board web that runs on support of a wire and a suction zone arranged at the trailing side of the steam chamber of the steam box for providing suction of steam mist discharged by the steam chamber. The suction zone extends to sides of the steam chamber so as to extend to the lateral areas of the web. The steam box includes edge cutter devices arranged in the area of effect of the suction zone extending to the lateral areas of the web, so as to remove the fibers and fillers produced during the edge cutting and prevent soiling of the edges of the steam box.

Abstract: A wire part of a machine for the production of continuous fibrous material webs, especially a papermaking machine, includes two continuous wire belts which together form a twin-wire zone. At least one supporting element having a supporting surface is disposed in the region of the twin-wire zone. At least a part of the supporting surface provides a supporting region which supports a first wire belt on its inner surface and a second wire belt on its outer surface. At least one formation box is provided and is disposed in the supporting region. The formation box is designed in such a way that, in the region of the inner surface of the second wire belt in the formation box, pressure values can be adjusted from a reduced pressure to an excess pressure acting on the inner surface of the second wire belt. The formation box extends in the direction of movement of the wire part over at least a part of the supporting region.

Abstract: Process an device for guiding a material web. The invention pertains to a method and apparatus for guiding a material web or strip thereof toward and around a movable guide element, in a simple and safe manner, which is achieved in that, for example, in the press portion of a papermaking machine, a strip of a paper web is brought into the vicinity of a rotating guide roller and, there, an air jet extending nearly tangentially, relative to the rotatable guide roller of a blast nozzle, serves for the transport to a subsequent unit.

Abstract: A transfer system for transferring a moving wet cellulosic web between two moving elements of a paper machine without excessive sheet flutter or breakage, supports the web and permits higher web speeds than presently used. The transfer system comprises a suction roll that forms a nip in contact with the web on the surface of a roll or web supporting belt, a doctor blade positioned in contact with the surface of the roll or web supporting belt immediately after the nip to ensure the web separates from the surface, and an air jet adjacent the doctor blade that blows air in a direction substantially opposite the moving web, between the moving web and the surface of the roll or web supporting belt, to guide and support the web towards the suction roll.

Abstract: A method and apparatus for improved dewatering of a papermaking stock in a web forming section of a papermaking machine including directing a stock jet stream into the head end of a run between opposed looped forming wires traveling in a substantially parallel forming run passing over a curved vacuum forming box and thereafter passing over one or more pressure locations with a pressure dome on one side and a water collecting chamber at the other side of the wires with the pressure dome in one form divided into compartments each applying an increasing pressure to the wire and stock between the wires with the air pressure being heated such as by being delivered from the dryer section and the wires separated slightly following the pressure location with a last smaller pressure compartment transferring the web to one of the wires and the wire carrying the web thereafter turning over a couch roll and the other wire carried over a turning roll.

Abstract: A transfer apparatus is disclosed for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum and a transfer mechanism is disposed adjacent to the backing drum for transferring the web without an open draw from the blanket to the felt such that the web follows the felt through the dryer section.

Abstract: The wet end of a fourdrinier paper machine includes a transversely disposed roll beneath the wire. The roll is shaped and mounted for rotation at a speed which is different from the speed of the wire to create pulses of negative pressure beneath the wire for drawing liquid from the web of fibers formed thereon. Also disclosed is a fin apparatus transversely disposed beneath the wire to create a wave of positive pressure thereunder to urge the formed web off of the wire.

Abstract: A fin apparatus is transversely disposed beneath a wire to create a wave of positive pressure thereunder to urge a formed web off of the wire. The fin surface, in transverse cross-section, is a smooth convex curve that diminishes in radius toward the downstream end of the fin.

Abstract: A paper machine has a forming wire loop which transports a web to a detachment transfer roll situated inside said wire loop at a detaching location where the web is to be detached from the wire and transported to a press section. A relatively dry felt engages the web on a sector of the detachment transfer roll at the detaching location and receives the web from the wire and continues to transport the web, while it adheres to the felt, to the press section. The detachment of the web from the wire on the detachment transfer roll is facilitated by the centrifugal force acting on the web which results from the substantial change of direction undergone by the web on the detachment transfer roll. In one embodiment, the press felt is directed to cover the web on a sector of the detachment roll by a press suction roll located on substantially the same level as the detachment transfer roll, the press roll having a suction sector which facilitates transfer of the web from the wire to the felt.

Abstract: A method for feeding a paper web from a forming wire and for dewatering the web including the steps of urging a pick-up felt against the web on the forming wire, adhering the web by suction to the surface of a pick-up felt, transferring the web onto a transfer felt which wraps a transfer roll, the latter being contiguous to the pick-up roll, passing the web on the transfer felt to a first dewatering press nip formed by an upper suction press roll and a cavernous surface lower press roll, the latter operating inside the transfer felt loop while the suction roll operates inside its own felt loop, pressing the web in the first press nip to dewater the web in two directions i.e.

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 web dewatering concept which has particular utility in papermaking processes wherein overall compression and compaction of the paper web by mechanical means is avoided comprising a high pressure jet of compressible fluid such as air or steam emitting from a slot extending across the entire width of the web. The web is constrained between a pair of foraminous supporting members while it is passed across a slotted nozzle expelling a jet of compressible fluid at pressures up to about 50 psig. The jet of compressible fluid scrubs the free water from the spaces between the fiber matrix of the web and the foraminous supporting members. The edges of the slotted nozzle make intimate contact with and form a seal against the interior surface of the foraminous supporting member closest the nozzle. This causes direct penetration of the web and the carrying members by the fluid jet, thereby continuously expelling an atomized stream of moisture from the web.

Abstract: A method for the separation of the paper web from the forming fabric in a paper-making machine comprising dividing the web into lengthwise strips to lessen the web adherence to the wire by utilization of a spray means incorporating a plurality of nozzles and then effecting web knock-down and separation from the wire by use of a slotted spray through which pressurized air jets are directed.Through this method very low pressures are required to achieve web separation and the risks of re-contact between web and wire are positively prevented.

Abstract: A paper machine has a pair of endless wire loops respectively having elongated portions which travel together upwardly along a common path where the wire loops form a twin-wire former. This common path has a lower receiving end for receiving pulp stock from which a web is to be formed and an upper discharge end from which a web issues from the twin-wire former while being transported by one of the endless wire loops beyond the discharging end of the common path. A lower forming roll around which the endless wire loops are lapped determines the lower receiving end of the common path as well as an initial portion of the common path along which the wire loops travel together. An upper forming roll is also lapped by the endless wire loop and determines the discharge end of the common path as well as a final portion thereof.

Abstract: A paper machine has a wire which transports a web to a detaching location where the web is to be detached from the wire and transported to a press section. A felt travels up to and beyond the detaching location to engage the web at the detaching location and receive the web from the wire while continuing to transport the web, while it adheres to the felt, to the press section. At the detaching location, by way of a structure which preferably is in the form of a suction box, a flow of air is created to travel first through the wire, then through the web, and then through the felt with this flow of air being highly localized so as to travel only through a relatively narrow rectangular area which extends transversely across the felt throughout the entire width thereof as well as the entire width of the web and wire.

Abstract: An improved low-density papermaking process particularly suited for use in conjunction with twin wire formation style papermaking machines is disclosed. In a particularly preferred embodiment, a foraminous drying/imprinting fabric conventionally utilized to thermally predry a moist paper web is extended to the twin wire formation zone, thereby eliminating one of the conventionally utilized Fourdrinier wire sections. Extension of the drying/imprinting fabric to the formation zone eliminates disturbance of the deflected portions of the paper web which fill the interstices of the drying/imprinting fabric during formation of the web, thus producing unexpected improvements in finished product bulk and absorptive capacity.

Abstract: The transfer of a fibrous web in a paper-making machine from a first foraminous belt to a second foraminous belt is facilitated by applying water to the side of the first belt opposite from the side on which the web is carried partially to wet the web, leading the second belt into engagement with the fibrous web before or after wetting it, and after the web is wet, and while the second belt is in engagement with the web, causing the water or gas pressure on the side of the web adhering to the first belt to exceed the water or gas pressure on the side of the web adjacent to the second belt.

Abstract: Method and apparatus for shrinking a travelling web of fibrous material by transferring the web of fibrous material on a porous carrier web to a transfer web travelling at a lower velocity than the carrier web, curving the carrier web to a convex curvature toward the transfer web, at the transfer area, and employing a differential pressure to aid in the transfer of the web of fibrous material to the transfer web. Transversal shrinking is also accomplished by deviating the travel direction of the transfer web in the transfer area laterally at an acute angle from the travel direction of the carrier web. The fibrous material may also be transferred to a second transfer web which may also be at a lateral angle to effect transversal shrinking.

Abstract: The auxiliary roll of the separating system is located downstream of the main roll and is spaced from the main roll at a distance less than 0.25 times the diameter of the auxiliary roll and greater than the combined thickness of the two wires and paper web therebetween, e.g. a distance of 10 millimeters. A separating wall is located between the main roll and main wire on the upstream side to block the entry of air between the main wire and main roll. The spacing of the two rolls ensures a positive separation of the paper web on the main wire.

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: The paper making machine is of compact construction and uses a suction roll as a guide roll for the felt web to aid in removing the paper web from the wire to the felt web and to press the felt web and paper web against the drying roll to aid in transferring the paper web to the drying roll. Secondary pressure rolls may also be used downstream of the suction roll for dewatering purposes. Also, a blower means is used to assist transfer of the paper web from the wire to the felt web.

Abstract: Structure for facilitating separation of a web and wire in a paper machine. Steam is supplied to the wire at the separating location where the web and wire separate from each other at a side of the wire opposite from the side where the web forms so as to facilitate separation of the web and wire from each other. Steam is supplied from the interior of a container which has a foraminous wall directly engaging the wire so that through the pores of the foraminous wall the steam will discharge to be conducted to the wire. The structure is particularly suitable in connection with twin-wire formers as well as in connection with the manufacture of tissue paper.

Abstract: A paper making apparatus and process of the type wherein the paper is processed from a starting condition of a slurry of pulp fiber to a later condition of a continuous self-sustaining paper sheet. The paper is carried continuously along a preselected path of travel extending from the starting condition to the later condition and for processing the paper as it is being carried. The path of travel normally includes a plurality of pairs of contacting members, including a forming wire and a pick-up felt, a pick-up felt and a bottom felt, and a pick-up felt and Yankee dryer, such contacting members processing the paper. The paper is passed through each nip defined by each of the contacting members and continues along its desired path of travel. Air pressure is applied on the discharge side or outgoing side of one or more of the nips defined between the sets of contacting members.