Abstract: Device and method for handling a material web, in which the material web is guided by at least one smooth support surface and is then guided together with a porous support belt to a deflection roll includes a suction box. The suction box has a wall opposite from the porous support belt, and creates a vacuum that draws the material web from the support surface to the porous support belt. The device also includes at least one sealing element positioned near a front end, in the web travel direction, the sealing element cooperating with the porous support belt, and a vacuum zone in which the vacuum is provided. The vacuum zone adjoins a side of the porous support belt not contacting the material web and is defined between the porous support belt, the at least one sealing element, the wall of the suction box, and at its rear end, the deflection roll.

Abstract: A press-to-dryer apparatus is disclosed for pressing and drying a web of paper. The apparatus includes a press for pressing the web of paper and a dryer disposed downstream relative to the press for drying the web. The dryer includes an unfelted drying cylinder disposed immediately downstream relative to the press. The arrangement is such that the web extends from the press to and around the drying cylinder. The dryer also includes a heater which cooperates with the unfelted drying cylinder such that the web is disposed between the drying cylinder and the heater for heating and drying the web. The dryer also includes a single-tier drying section which is disposed downstream relative to the unfelted drying cylinder for completing the drying of the web.

Abstract: Condensation device and suction element including a condensation device for machines for manufacturing and refining a fibrous material web. The condensation device includes at least one condensation element positioned in a region of at least one of steam formation and accumulation and a condensate receptacle. The suction element includes a hollow body coupled to a vacuum source. The hollow body is adapted to guide a transport belt carrying a moist and heated web. The suction element also includes at least one opening positioned to face the transport belt, at least one condensation element, and at least one condensate receptacle. The at least one condensation element and the at least one condensate receptacle are positioned within the hollow body.

Abstract: An apparatus for drying and smoothing a fibre web between two tight bands that move in parallel and run around turning rolls, the first band being heated with hot steam and the second band being cooled with water, and the fibre web being conducted through the drying zone that the bands define together with at least one felt or wire such that the fibre web is in contact with the surface of the first, heated band and that the felt or wire is between the fibre web and the second, cooled band. The apparatus and method further comprise spreading the fibre web in its transverse direction before it is led into the drying apparatus.

Abstract: A machine for producing a material web, including a paper or cardboard web, having a plurality of cylinders around which the material web is guided in a meandering path together with a conveyor (transport) belt. The machine further includes at least one air conveying device disposed in the transfer region between two cylinders. The air conveying device associates with the free circumference region of a cylinder and aspirates the material web as the material web travels in a path free from contact with the cylinders as the material web travels between two succeeding cylinders. The material web and the conveyor belt are partially wound around the circumference region of the cylinders. According to the invention, the air conveying device only covers certain areas of the free circumference region of the cylinder on which the material web (paper web) winds.

Abstract: A limiting orifice through-air-drying medium for papermaking or other absorbent embryonic webs. The medium may be used in an apparatus which can be embodied in a cover and a roll. The medium has the unique combination of a relatively high bending fatigue strength and relatively low pressure drop. The medium may comprise a laminate of a plurality of plies. The intermediate plies of the laminate may be woven with a square weave. The medium may also be used for other types of drying.

Abstract: A system (20) and associated process for use in the dryer section (18) of a papermachine for promoting complete support of the paper web (32) by the carrier fabric (34) as the fabric and web are transferred between adjacent drying cylinders (22, 24) by way of a turning roll (26) utilizes a blowbox assembly (50) positionable within the pocket region (40) bounded by the drying cylinders and the turning roll. The blowbox assembly is adapted to direct air out of the pocket region to reduce the likelihood of separation of the web from the carrier fabric as the web is moved onto and off of the turning roll.

Abstract: The invention relates to an arrangement for a drying section of a paper machine, the arrangement comprising a fine wire (5a) and a coarse wire (5b) that are arranged to pass between metal bands (2, 3) of a band dryer (1) together with a web (4) to be dried. The fine wire (5a) comprises at least three interwoven textural layers, wherein the outermost layers, in other words a surface (10) and a bottom (11), have a finer texture than the middle section (12) situated between them. According to a preferred embodiment, the surface layer (10) is provided with a denser texture than the bottom (11), which, in turn, has a denser texture than the middle section (12).

Abstract: The invention relates to an arrangement for a drying section of a paper machine, the arrangement comprising a fine wire (5a) and a coarse wire (5b) that are arranged to pass between metal bands (2, 3) of a band dryer (1) together with a web (4) to be dried. The coarse wire (5b) comprises a fine texture (5d) to be placed against the cooled metal band (3). Further, against the fine-textured section (5d) placed against the cooled metal band (3) there is a coarse texture (5c).

Abstract: An apparatus for drying a cellulosic fibrous structure. The apparatus comprises a micropore medium having pores therethrough. The pores are the limiting orifice in the air flow used in the drying process. The micropore medium has a relatively low wet pressure drop therethrough. This relatively low wet pressure drop advantageously reduces the energy costs used in drying, and/or allows for greater drying to be obtained at constant energy costs.

Abstract: An apparatus for drying a fiber web, in which apparatus the fiber web (5) is dried between two tight bands (1, 2) moving in the same direction and turning around turning rolls (6a, 6b, 7a, 7b). The first band (1) is heated by means of a pressure chamber (9) and the second band (2) is cooled by means of a water chamber (10). The fiber web (5) is led together with at least one felt or wire (3, 4) through a drying zone defined by the bands (1, 2) in such a way that the fiber web is in contact with the surface of the first band (1) and the felt or wire (3, 4) is between the fiber web (5) and the second band (2). At least one band (1, 2) is guided by a shoe (11a, 11b) in such a way that the fiber web substantially immediately upon coming into contact with the first band (1) is exposed to the effect of the compression pressure of the pressure chamber (9).

Abstract: A machine and method for producing a material web, e.g., a paper or cardboard web. The machine includes a dryer group having a plurality of dryer cylinders and web guide rolls. A dryer (or guide) belt may guide the material web around the dryer cylinders and web guide rolls in a meandering or winding path. The dryer group may include a cooling device that cools the dryer belt by exerting an air current on the dryer belt after separation from the material web. The method may include drying the material web in a region of the dryer group in which the material web is held and guided between the dryer belt and each drying cylinder, and substantially preventing drying of the material web in a region of the dryer group in which the material web is transferred from one drying cylinder onto a subsequent one.

Abstract: An apparatus for drying an embryonic web. The apparatus comprises a micropore medium having pores therethrough. The pores are the limiting orifice in the air flow used in the drying process. The micropore medium has a surface oriented towards and preferably contacting the web to be dried. This surface has a relatively low surface energy, and preferably a surface energy of less than 46 dynes per centimeter.

Abstract: The dryer section in a papermaking machine has a single tier of all top felted dryer rolls six to nine feet in diameter. Air caps are employed over the dryer rolls to simultaneously dry both sides of the web to prevent curl and to increase drying rates. The air caps employ blown air at a temperature of 250-900 degrees Fahrenheit and air speeds of 8,000-40,000 feet per minute. The dryer fabric employed is foraminous with a permeability of between 300-1,200 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 900 degrees Fahrenheit and average temperatures of between 500-600 degrees Fahrenheit. A single transfer roll, or more advantageously, two grooved vacuum rolls in a vacuum box are disposed between the dryer rolls to maximize the circumferential wrap of the web and, at the same time, support and transport the web between dryer rolls.

Abstract: The dryer section in a papermaking machine has a single tier of all top felted dryer rolls six to nine feet in diameter. Air caps are employed over the dryer rolls to simultaneously dry both sides of the web to prevent curl and to increase drying rates. The air caps employ blown air at a temperature of 250-900 degrees Fahrenheit and air speeds of 8,000-40,000 feet per minute. The dryer fabric employed is foraminous with a permeability of between 300-1,200 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 900 degrees Fahrenheit and average temperatures of between 500-600 degrees Fahrenheit. A single transfer roll, or more advantageously, two grooved vacuum rolls in a vacuum box are disposed between the dryer rolls to maximize the circumferential wrap of the web and, at the same time, support and transport the web between dryer rolls.

Abstract: In the device disclosed, a paper web is carried on a belt and stabilized by an underpressure produced by a box opposite the roll, the paper web being sucked by the underpressure against the belt. Located in the box, immediately following the underpressure zone, may be a pressure zone which assists to transfer the paper web to the roll. In an alternative embodiment, a fan can be avoided. Instead the air entrained by the rapidly running belt is deflected by a wedge-shaped deflector and passed over a slit to generate an underpressure inside the box.

Abstract: A dryer section employs top-felted and bottom-felted dryer sections each comprised of a single steam-heated drying cylinder with a diameter of about 12 feet. The web is transferred between drying cylinders by a two vacuum roll transfer without an open draw. The dryer fabric wrap on the large dryer cylinders is over 270 degrees resulting in large drying capability per dryer roll. Because each large dryer is followed by another large dryer roll which dries the opposite side of the web, uniformity of drying is maintained. Each dryer cylinder may have its own dryer fabric stretcher and guides. Alternatively, individual dryer fabrics service multiple top-felted dryers and bottom-felted dryers respectively. The web is constrained approximately 96 percent of the time as it passes through the is dryer section. The dryer section can achieve 2.9 inches of dryer surface in the machine direction for every inch of dryer section.

Abstract: An apparatus for drying a cellulosic fibrous structure. The apparatus comprises a micropore medium having pores therethrough. The pores are the limiting orifice in the air flow used in the drying process. The micropore medium has a relatively low pressure drop therethrough. This relatively low pressure drop advantageously reduces the energy costs used in drying, and/or allows for greater drying to be obtained at constant energy costs.

Abstract: Method and equipment for the manufacture of corrugated paper products includes separate heaters for preparing liner and medium components. Data regarding these components is collected and an optimum conditioning for the components is determined.

Abstract: The invention relates to an apparatus for drying a fiber web, in which apparatus the fiber web (5) is dried between two tight bands (1, 2) moving in the same direction and turning around turning rolls (6a, 6b, 7a, 7b). The first band (1) is heated by means of a pressure chamber (9) and the second band (2) is cooled by means of a water chamber (10). The fiber web (5) is led together with at least one felt or wire (3, 4) through a drying zone formed by the bands (1, 2) in such a way that the fiber web is in contact with the surface of the first band (1) and the felt or wire (3, 4) is between the fiber web (5) and the cooled second band (2). The surface (11) of the first band (1) bearing against the fiber web (5) is at least partially formed in such a way that reflection from it to a specular reflection angle is reduced substantially. Excessive gloss can then be removed from the surface of the fiber web (5) and the end product to be manufactured of it.

Abstract: The invention relates to dryer assembly including a taper cutter device, which is disposed adjacent to and after a top felt dryer group of a paper making machine. The taper cutter may be arranged between a last dryer cylinder of the top felt dryer group and a subsequent web guide roll. Further, the taper cutter may be positioned to contact the material web after a transport belt has separated from the material web and before the material web is lifted off a last dryer cylinder surface. At least the final dryer cylinder and the subsequent web guide roll can be driven.

Abstract: A novel sheet transfer stabilizer is provided for transferring a fibrous wet sheet from a press section to a dryer section of a paper-making machine by way of a felt. The sheet transfer stabilizer includes a composite Venturi box which is disposed between a felt roll of the press section and a first dryer. The Venturi box includes three side-by-side Venturis, an inlet Venturi, an outlet Venturi, and a main Venturi. Such Venturi boxes are used to create and maintain a vacuum in the felt/web system.

Abstract: A method of controlling a web of paper forming slurry stationary on a dryer fabric during drying in the drying section of a papermaking machine comprising:forming the dryer fabric of synthetic yarns to be continuous;positioning the dryer fabric about drying drums of the paper drying machine;providing the dryer fabric with an adhesive or tacky support surface and delivering the web onto the adhesive support surface for passage through the dryer section;gripping or securing the web with the adhesive support surface into a relatively fixed and stationary position on the dryer fabric as it is passed about the drums and through the drying section of the paper making machine; andremoving the web from the dryer section.

Abstract: An apparatus for drying and smoothing a fibre web (5) between two tight bands (1, 2) that move in parallel and turn around turning rolls (6a, 6b, 7a, 7b), the first band (1) being heated with hot steam and the second band (2) being cooled with water, and the fibre web (5) being conducted through the drying zone that the bands (1, 2) define together with at least one felt or wire (3, 4) such that the fibre web (5) is in contact with the surface of the first, heated band (1) and that the felt or wire (3, 4) is between the fibre web (5) and the second, cooled band (2). In the invention, the fibre web (5) is smoothed such that the press means located in the vicinity of the first turning rolls (6a, 7a) in the travel direction of the fibre web (5) apply to it a pressure that is essentially higher than the pressure in the other parts of the drying zone.

Abstract: A drying section for drying a traveling web of paper, which has successive drying groups each having drying cylinders, a felt or wire belt supporting the traveling web and resting against the drying cylinders, and guide rolls serving for the guiding of the web to be dried and of the felt or wire belt. The guide rolls are so arranged that the traveling web is guided in meandering form in the transfer region between two successive drying cylinders associated with different felt or wire belts. The transfer region is between the felts of two successive drying groups or the transfer region is between two felts in the two rows of a two tier drying group.

Abstract: In a dryer section comprised of several drying groups, and particularly an alternating single tier dryer section, one of the bottom felted drying groups is arranged with respect to the paper machine floor so at least the rotating shafts at the axis of the drying cylinders of the one drying group are below the paper machine floor. The guide rolls of the bottom felted drying group and of an adjacent top felted drying group may be in one horizontal shaft plane above the paper machine floor. An intermediate floor is provided beneath the main machine floor and the bottom of the basement beneath the one drying group. Easier access to the drying cylinders and elements of both top felted and bottom felted drying groups is obtained.

Abstract: A method and device for contact drying a paper web, wherein the paper web is dried initially in a number of successive groups with single-wire draw by pressing the paper web via drying wires of each groups against the heated faces of the drying cylinders and by guiding the paper web on support of the same drying wire from one drying cylinder onto the next drying cylinder over the reversing suction cylinders or rolls in each group with single-wire draw. In the groups with single-wire draw, the paper web is dried to a first dry solids content, after which the paper web is dried directly further by a single group with twin-wire draw to a second dry solids content, after which the paper web is dried further to its final dry solids content by a single normal group with single-wire draw. The limits of the first and second dry solids contents are selected so that, in the middle or in the beginning of the range, the tear strength index and the breaking strength index of the web are at their maximum.

Abstract: A hood for a wire part and/or a press section in a paper/board machine including walls and a ceiling which form a closed hood around the wire part and/or press section, air-conditioning or another air-control system being arranged in connection with the hood. The hood walls have outer and inner walls which define an air duct therebetween for passing a replacement air flow into the interior of the hood, preferably toward a middle area of the paper machine, through openings in the inner wall, the replacement air keeping the interior of the hood substantially dry and clean. The walls of the hood include a vertical side wall at the driving side, which wall is preferably fixed, and a tending-side vertical side wall and a ceiling formed as a single wall which is preferably L-shaped and displaceable. The displaceable hood wall at the tending side has two parts so that the first hood wall is placed by the wire section and the second hood wall is placed by the press section.

Abstract: Method and equipment for the manufacture of corrugated paper products includes separate heaters for preparing liner and medium components. Data regarding these components is collected and an optimum conditioning for the components is determined. High voltage sensors, associated electronic circuitry and computer controls are used to determine surface moisture values.

Abstract: Cross machine stuffer yarns are used in the construction of a base fabric for a papermakers wet felt. The stuffer yarns in combination with a multiple pass heat setting process stabilize the machine direction yarns of the base fabric to provide resistance to nip rejection. Preferably a fibrous batt is needled to the base fabric to finish the wet press felt.

Abstract: A method and device for drying a paper web wherein the paper web is supported on a drying wire without long open draws of the web. The paper web is contact-dried by pressing it with the drying wire onto a face of a contact-drying cylinder whose diameter is greater than about 1.5 m on a sector b whose magnitude is greater than about 180.degree.. The web is evaporation-dried as blowing-on drying and/or as through-drying by means of high-velocity drying-gas jets applied to the web on the drying wire on the face of the following large-diameter cylinder whose diameter is greater than about 2 m on a sector a having a magnitude greater than about 180.degree. while the web is on the side of the outside curve. The web to be dried is passed over a sector c of the suction roll which is subjected to negative pressure while the web is supported on the drying wire at the side of the outside curve. The magnitude of the sector of the suction roll has a magnitude greater than about 160.degree.

Abstract: An apparatus for drying a wet sheet material such as a paper web is presented. The apparatus is provided with a suitable number of dryer cylinders operating in conjunction with a plurality of steam blast ports disposed adjacent to the dryer cylinders. A vertically movable canopy hood and a middle hood having sheet entry/exit opening and a door opening device are provided. The wet sheet material is held between two endless fabric belts, and passed through the dryer cylinders alternatively via suction fabric rolls, fabric rolls and fabric tension rolls. The drying process is carried out in an atmosphere of superheated steam of over 100.degree. C. inside the canopy hood and the middle hood, and the steam generated from the wet sheets is recirculated through an exhaust screen, a super heated steam circulating fan, an adiabatic compressor and a supply duct. Another atmosphere of heated moist air having a dew point of at least 80.degree. C. is also employed.

Abstract: A method and apparatus for cutting a paper web (W) in a group of drying cylinders provided with single-wire draw (13) in a paper machine or a finishing machine. The drying wire (13) is separated from the paper web (W) by one or more guide rolls (14a, 14b) thereby creating a open draw (W.sub.0) for the web (W). The cutting of the paper web (W) is carried out at the open draw (W.sub.0) of the web (W). After the open draw (W.sub.0), the drying wire (13) and the web (W) are rejoined on the surface of the following leading or drying cylinder (11). Preferably, two guide rolls (14a, 14b) are utilized whereby the first roll is disposed so that the drying wire (13) supports the web (W) up to the location of the guide roll (14a), which is followed by an open draw (W.sub.0) of the web. The drying wire (13) is returned onto the following leading or drying cylinder (11) with the second guide roll (14b).

Abstract: In a roll for a paper-making machine, a torque which is needed for rotating the roll is reduced and the drive power and a running cost are reduced. A hollow perforated roll in the paper-making machine is rotatably mounted on a bearing housing via a bearing. A cylindrical stationary center shaft extends in an axial direction through a center of the roll and has a perforated circumferential surface. At least two fins extending in an axial direction are mounted on an outer circumferential surface of the center shaft within the hollow interior of the roll, their outer edges being spaced from the inner circumferential surface of the perforated roll. Radially extending disc-like fins are also mounted on the outer circumferential surface of the center shaft perpendicular to an axis of the center shaft with their outer circumferential edges being spaced with a slight gap from the inner circumferential surface of the perforated roll.

Abstract: A limiting orifice through-air-drying apparatus for papermaking or other absorbent embryonic webs. The apparatus has a first zone and a second zone. The first zone is maintained at a differential pressure less than the breakthrough pressure, while the second zone is maintained at a differential pressure greater than the breakthrough pressure. The residence time of the embryonic web to be dried with the apparatus is maintained at preferably less than 35 milliseconds on the first zone. Using the dual zone system described above, the overall energy required to run the apparatus can be reduced.

Abstract: The paper dryer section has a single tier of all top felted dryer rolls seven to nine feet in diameter. Air caps are employed over the dryer rolls to simultaneously dry both sides of the web to prevent curl and to increase drying rates. The air caps employ blown air at a temperature of 200-1,000 degrees Fahrenheit and air speeds of 8,000-40,000 feet per minute. The felt employed is foraminous with a permeability of between 300-1,500 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 1,000 degrees Fahrenheit and average temperatures of between 500-600 degrees Fahrenheit. A single dryer roll, or more advantageously, two vacuum rolls in a vacuum box are disposed between the dryer rolls to maximize the circumferential wrap of the web and, at the same time, support and transport the web between dryers.

Abstract: A heat shield which is attached to a heatable roller in a stretching machine for the treatment of felt and wire cloths is designed to have channels for the heating medium extending in the machine direction. The ducts may be grouped in sections having a connection to an inlet and outlet manifold. Each section is attached to a by-pass. In this way a heating medium can be fed into the shield in controlled portions over the longitudinal direction of the shield thus obtaining the possibility of control and regulation of the temperature profile over the cross-section of the band.

Abstract: A dryer section in a paper machine which comprises a number of dryer groups, each having drying cylinders, reversing cylinders arranged between adjacent pairs of drying cylinders and a wire which presses the web against heated cylinder faces of the drying cylinders whereas the web remains at the side of the outside curve on the reversing cylinders. The dryer groups are arranged in two or more stories. Some of the dryer groups in the dryer section are placed in the basement spaces underneath the machine hall level, and some of them are placed on the machine hall level.

Abstract: A limiting orifice through-air-drying apparatus for papermaking or other absorbent embryonic webs. The apparatus has a first zone and a second zone. The first zone is maintained at a differential pressure less than the breakthrough pressure, while the second zone is maintained at a differential pressure greater than the breakthrough pressure. The residence time of the embryonic web to be dried with the apparatus is maintained at preferably less than 35 milliseconds on the first zone. Using the dual zone system described above, the overall energy required to run the apparatus can be reduced.

Abstract: A dryer section for a paper machine including dryer groups with single-wire draw, each of which includes drying cylinders, reversing cylinders or rolls arranged in gaps between the drying cylinders, and a drying wire for carrying the web under constant contact with the wire over the drying cylinders and reversing cylinders or rolls so that the web enters into direct contact with the drying cylinders and that the wire enters into direct contact with the reversing cylinders or rolls. In at least one of the groups with single-wire draw in the dryer section, four drying cylinders are placed in pairs side by side and one above the other so that the upper pair of cylinders is placed at a lower level than the other cylinders in the group.

Abstract: An apparatus for autoclave continuous decatizing of fabrics, having a rotating cylinder which closes the slot through which a backing cloth and the associated fabric pass to enter and exit the autoclave is provided. A foraminous hollow member, which is adapted to reduce the percentage of oxygen existing within the autoclave (1), is located adjacent to the backing material and the fabric where the backing material and the fabric enter the autoclave. Thin plates (14) are further preferably provided, movable closer to the inside of the fabric (4) immediately before it exits from the autoclave (1), under the external control, in order to be able to possibly continue the "sandwich" pressing action which takes place along the periphery of the foraminous cylinder (2), or to have in this area a free vaporizing stretch.

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: A method for contact drying a paper web, wherein the paper web is dried by heated smooth-faced drying cylinders by passing the web through successively arranged so-called normal groups with single-wire draw in which drying cylinders are situated in a first row and reversing suction cylinders or equivalent suction rolls are situated in a second row. Thereafter, the web is dried by passing it through a hybrid dryer group which hybrid dryer group consists of a normal portion with single-wire draw and a portion with twin-wire draw, one of the wires in the twin-wire portion constituting the wire of the portion with single-wire draw whereas the other wire in the twin-wire portion is a separate wire. The invention also relates to a dryer section of a paper machine wherein the initial part includes successively arranged so-called normal groups with single-wire draw after which one hybrid dryer group is provided, in which there is a portion with single-wire draw and a portion with twin-wire draw.

Abstract: An apparatus and method for drying a wet sheet material such as a paper web is presented. The apparatus is provided with a suitable number of dryer cylinders operating in conjunction with a plurality of steam blast ports disposed adjacent to the dryer cylinders. A vertically movable canopy hood and a middle hood having sheet entry/exit opening and a door opening device are provided. The wet sheet material is held between two endless fabric belts, and passed through the dryer cylinders alternatively via suction fabric rolls, fabric rolls and fabric tension rolls. The drying process is carried out in an atmosphere of superheated steam of over 100.degree. C. inside the canopy hood and the middle hood, and the steam generated from the wet sheets is recirculated through an exhaust screen, a super heated steam circulating fan, an adiabatic compressor and a supply duct. Another atmosphere of heated moist air having a dew point of at least 80.degree. C. is also employed.

Abstract: A single tier drying section apparatus is disclosed for drying a web of paper. The drying section includes a first and a second dryer which are disposed in a single tier for drying the web. A vacuum roll is disposed closely adjacent to and between the first and second dryers for guiding the web from the first to the second dryer. The vacuum roll includes a rotatable roll shell having a first and a second end. The shell defines an outer surface and an internal chamber which extends between the first and the second end of the shell. The shell defines a plurality of channels with each channel extending from the chamber to the outer surface such that the chamber is disposed in fluid communication with the outer surface. A vane mechanism is disposed within the chamber for evacuating the chamber. The arrangement is such that a flow of air flows towards the chamber through the plurality of channels for drawing the web into close conformity with the dryer felt when the web extends around the vacuum roll.

Abstract: Drying section. A drying section of a papermaking machine, is comprised of several drying groups, wherein the last drying cylinder of one drying group is arranged a short distance from the first drying cylinder of the following drying group and wherein the paper web extends directly from the last drying cylinder to the first drying cylinder, thereby permitting quick transfer of the paper web, between the drying groups.

Abstract: A vacuum roll apparatus is disclosed for transferring a web supported on a dryer felt from a first to a second drying cylinder of a dryer section. The apparatus includes a rotatable perforate shell having a first and a second end, the shell defining a cavity which extends from the first to the second end of the shell. The arrangement is such that the dryer felt extends from the first dryer around the perforate shell to the second dryer with the web extending contiguously with the dryer felt, and the dryer felt being disposed between the shell and the web. At least one fin is rigidly secured to the shell and is disposed within the cavity such that when the shell is rotated, the fin generates a flow of air through the perforate shell towards the cavity for drawing the web into close conformity with the dryer felt during movement thereof around the vacuum roll apparatus so that the web is restrained against cross-machine directional shrinkage.

Abstract: A drying section for use in a papermaking machine has a two-felt drying group with an upper row of cylinders and an upper felt and with a lower row of cylinders and a lower felt. In each row of cylinders, two adjacent cylinders form a sub-group having a deflection suction roll disposed therebetween. A web to be dried passes alternately through the upper and lower sub-groups. Opposite each deflection suction roll of one row of cylinders lies a section of the felt path of the other row of cylinders, the space located therebetween being free from components to facilitate removal of paper broke.

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: The top and bottom felts at the web transfer between two dryer sections in a single tier papermaking dryer are spaced by pivoting the vacuum roll over which the felt and web move. The vacuum roll is mounted to two pivot arms which are driven by inflatable air rides to alternately incline the roll toward the downstream felt, forming a sandwich of the two felts and the web, and to a spaced position. The short motion of the vacuum roll allows standard felt stretchers to be used, and permits rapid adjustment of the felt spacing.