Abstract: Process and apparatus for monitoring dewatering in a wet end section of a web production machine. The process includes measuring water flowing into the wet end section, measuring water flowing out of the wet end section, measuring conductivity of the wet web entering the wet end section, measuring conductivity of the water flowing into wet end section, measuring conductivity of water flowing out of the wet end section, and determining a water balance from the measured quantities, which is indicative of dewatering in the wet end. The apparatus is arranged to perform the process.

Abstract: A paper or board web is manufactured in an on-line manufacturing process, in which the web is passed from a paper or board machine (15) directly to a finishing device/finishing devices (60, 50, 10). The state of the finishing device/finishing devices (60, 50, 10) is monitored and, during a shutdown of a finishing device (60; 50; 10), said finishing device is bypassed, the web coming from the paper or board machine (15) is wound into machine reels and/or treated by means of some finishing device/finishing devices and wound into machine reels. A paper or board machine forms an on-line manufacturing process together with a finishing device/finishing devices.

Abstract: Method and apparatus for measuring, monitoring and/or providing an indication of material “damage” in board products, particularly Machine Direction (MD) Shear. In this regard, the present document discloses applying a predetermined force to a board product such that the board product is not deflected beyond its elastic region. The apparatus used for applying the force is preferably of a size or structure suitable for physically limiting the amount of deflection of the board product. By maintaining the board product within its elastic region as such, the occurrence of permanent damage to the board product is reduced. Hence, the disclosed method and apparatus are able to provide a non-destructive indication of MD Shear on the paperboard product being tested, and are thus suitable for use in on-line testing/monitoring of paperboard production.

Abstract: A system for maintaining calender rolls of a paper machine clean when producing high-gloss paper or coated paper, such as LWC or MWC. To prevent a coating agent, such as coating dye, from adhering onto and soiling a smooth surface of a calender roll, with an overheating phenomenon, the system has a second measurement station (10) provided with measuring and indicator means for producing an output indicating soiledness of the web (W) or a humidity profile. When the output of the second measurement station (10) indicates excessive soiledness or an uneven humidity profile, the system performs at least one of: cleaning the surface of the smooth-surfaced calender roll; changing the nip load in the calender (5); making a correction adjustment of the CD-directional humidity profile of the web (W); cutting the web (W) and conducting it into the pulper; and/or changing the running speed of the web (W).

Abstract: The invention relates to a process for measuring and controlling the nip pressure in the press of a paper machine, particularly in a shoe press, across and/or along the web running direction. It is largely characterised by the hydraulic, static pressure being measured at reference points through measurement boreholes in the press nip and adjusted continuously. In addition, the invention relates to a device for carrying out the process.

Abstract: Pressurized web treatment systems include a moving web that passes through a pressurized treatment chamber having a sealing assembly with a leakage control system. Leakage control is achieved by the cooperative effect of localized leak detectors and leak reduction means that applies a local sealing force on the seal assembly responsive to a signal from the leak detectors such that increased sealing occurs in the vicinity of the leak. In particular, an air press for paper web dewatering has improved efficiency by virtue of the leakage control system, which features local leak detectors and local force generation means associated with a flexible seal assembly to reduce leakage at the edges of the stationary plenum of the air press. Local leak detection can be based on sonic measurement with microphones, detection of escaping tracer gas, optical signals, and other means.

Abstract: System and method for oxidizing contaminants to alter specific properties, such as tack, of contaminants. The present invention reduces the tack of the stickies and pitch by exposing the materials for a short duration to low-energy pulsed electrical discharges between a pair of electrodes that are submerged in a liquid medium, such as a fiber stream, water, a pulp slurry, or whitewater. An electrical discharge in the liquid medium oxidizes materials, which may be dissolved or suspended therein, such as stickies, pitch, sulfide, ink, toner, and other substances, thereby reducing tack, odor, and/or zeta potential, as well as producing other desirable effect.

Abstract: An improved measuring system used with a process control system provides substantially real time correction of aliasing effects in a system having moving equipment that exhibits periodic parameters while being monitored. The measuring/control system can be used with a rotating equipment process line, such as used in a paper mill, in which a measurement scanner travels in the cross direction of a moving web of material, while that same moving web of material continues to move in a longitudinal direction (the machine direction) transverse to the cross direction. The measuring/control system begins by acquiring data utilizing a time synchronous monitoring system that produces a count matrix and a measurement matrix of readings from the measurement scanner. After a sufficient number of data samples have been acquired, a correction matrix can be built.

Abstract: Device for controlling or regulating a basis weight of a web in a web manufacturing process of a web producing machine. The device includes a first control circuit, adapted to adjust the basis weight, that includes at least one adjustable device for influencing the basis weight and at least one basis weight sensor. A second control circuit having at least one sensor for detecting a concentration of incoming backwater is also provided. The instant 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: An apparatus for dosing a liquid in manufacturing paper products, the apparatus comprising: a mixed fluid conduit carrying a mixed fluid to be directed to an application station, at least a portion of the mixed fluid being a starch material from a starch material source; a starch material source feeding starch within a starch material supply line to the mixed fluid conduit; a resin source feeding resin within a resin supply line to the mixed fluid conduit; and, a mixing section of the mixed fluid conduit dispersing the resin throughout the starch material. The apparatus may also include: a tank for receiving the mixed fluid; a supply conduit for delivering the mixed fluid to an application station; and, a return conduit for delivering the mixed fluid back to the tank from the application station.

Abstract: A headbox (10) has a stock inlet header, a tube bank, a tubulence generator and a slice channel. Measurement targets (PA, PB, PC, P, PE) are provided with means for making measurements of the fiber mobility of the fiber suspension, then controlling the flow state of the suspension. Sensors on the width of the headbox (10) or traversing sensors are positioned on different width points of the headbox (10) and arranged to measure the fiber mobility profile, with means for changing the flow state on the basis of the measurements. Apparatus for diluting the thick stock into headbox consistency and units for cleaning the stock to be fed into the headbox may be provided. Sensors may be disposed in the short circulation pipes or cleaning units arranged to measure the fiber mobility of the fiber suspension with means for changing the flow state on the basis of the measurement data.

Abstract: The present invention relates to improvement in a method for estimating a setting value of a dryer steam pressure after papermaking exchange according to simulation in a papermaking machine and an apparatus therefor, where a steam pressure setting value after papermaking exchange is estimated accurately by determining an in-hood air dry-bulb temperature on the basis of a difference between an in-drum steam temperature which has been just measured and an initial value of an in-drum steam temperature, thereby reducing a papermaking exchange time as well as reducing broke and improving the rate of operation.

Abstract: An apparatus and method are provided to reduce the size of solid clumps of material and thereby permit reuse of the material. In particular, the apparatus and method allow for reuse of sediment accumulated in a storage area for paper pulping byproducts. The sediment is conveyed from the storage area to an tank. In the tank, the sediment is agitated to produce reduced-size clumps of the sediment. The reduced-size clumps are in a slurry that is capable of being burned at least one of a facility that produces paper pulp and a facility that produces paper products.

Abstract: A paper/board machine headbox (10) has a stock inlet header (J), a tube bank (11), a turbulence generator (13) and a slice opening (14) which is provided with a profile bar. The headbox (10) is provided with cross direction measuring sensors (D1, D2; Dmn), by means of which the flow rate profile of the headbox (10) is determined, and the profile bar of the slice opening (14) of the headbox (10) is adjusted in the cross direction on the basis of the thus determined flow rate profile. The headbox (10) is provided with measuring sensors (D1, D2; Dmn) for determining the cross direction flow rate profile of the headbox (10) and with means for adjusting the profile bar on the basis of the flow rate profile.

Abstract: A scanner for moving sheet materials such as a paper making machine provides the gauging heads which measure parameters such as basis weight and moisture entirely inside an enclosed tubular beam. Each gauging head is driven in a cross direction perpendicular to the moving sheet direction and includes a seal belt for dust and dirt protection by covering a slot in the beam, except where the gauging is located.

Abstract: Streak defects in web structures are characterized by electronically obtaining a plurality of results of a plurality of tests of a web structure, electronically determining a location of and/or a quantification of one or more streak defects based on the plurality of results, and electronically characterizing the streak defect(s) as being static or stochastic based on the plurality of results.

Abstract: The measuring device comprises at least one measuring head having a reference part, which comprises a reference surface against which the moving web is supported. The reference surface comprises a measuring area in the inside of which the property of the web is measured. The reference part is arranged in connection with the measuring head in such a way that below the reference part, there is a substantially open air space. The measuring head comprises means for generating negative pressure in the air space below the reference part, and the reference part comprises holes formed through it, in such a way that the negative pressure generated in the air space affects through the reference part the space between the reference surface and the moving web in such a way that the web is supported against the reference surface substantially over the whole area of the measuring area.

Abstract: In a method of monitoring the state of a felt serving for the dewatering of a fiber web, in particular of a paper web or of a cardboard web, the felt topography is measured and/or an image of the felt surface having definition in depth is produced by mean of an optical measuring device and the result of the measurement obtained is compared with previously stored error patterns by means of an evaluation and/or control unit. Corresponding felt conditioning measures are then initiated, preferably automatically, in dependence on the result of the comparison. A corresponding felt monitoring device is also described. In a further method of monitoring the state of a felt or screen serving the dewatering of a fiber web, in particular of a paper web or a cardboard web, specific felt and/or screen properties are determined permanently or cyclically at intervals and are filed under a pre-settable felt and/or screen name in a historical database.

Abstract: A process and device to detect the presence of a fibrous material web in machines for manufacturing the same, whereby the fibrous material web is guided by at least one continuously circulating belt. The process includes measuring at least one of (1) a temperature of a side of the fibrous material web opposite the at least one belt while it is being supported by the at least one belt, (2) a temperature of a material web supporting side of the side of the at least one belt after transfer of the fibrous material web to a following unit, and (3) the temperature of a side of the at least one belt opposite the fibrous material web supporting side of the at least one belt. The process also includes detecting a change in the at least one measured temperature as an indicator of the presence or lack of fibrous material or the strip in an area in the machine in the vicinity of the measuring.

Abstract: A property of a paper web is measured using one or more reflectance measurement sensors emitting measuring beams onto the web and receiving the beams reflected from the web, from which the web property is deduced. The web is supported on a web support during the measurement, such as on a passive or active airfoil or fabric. One or more measurement sensor(s) can be integrated within an active airfoil, and can comprise a plurality of optical fibers having sensing ends arranged in the airfoil such that the sensing ends of the fibers face the moving paper web through one or more apertures in a web-supporting panel of the airfoil. Alternatively, a traversing sensor can be mounted within the airfoil. Other embodiments include a reflectance sensor mounted adjacent an airfoil or other web support such as a through-air drying fabric or a support belt for the web.

Abstract: The invention is directed to a system and method for implementing process control for paper elasticity and thickness using sonic NDE techniques. The system may, for example, generate ultrasound waves in a test object during the manufacturing process. A detector such as an interferometer may be used to detect the ultrasound waves. An interpreter or analyzer may determine the thickness and/or elastic properties of paper from the waves. Then, a control system may determine and implement an appropriate control action on the process.

Abstract: Method and apparatus for controlling the mixing proportions of feed streams being supplied to a headbox, using devices for sampling two or more of the feed streams upstream of the headbox and devices for measuring concentration of constituents in or other properties of those samples. A method of regulating one or more properties of a moving web, and especially a paper web during manufacture, employing the aforesaid method and apparatus are also disclosed.

Abstract: A shoe press includes: a first member; a second member; a substantially cylindrical belt; and a processing unit. The first member has a convex pressing surface. The second member includes a shoe with a concave pressing surface substantially complimentary to the convex pressing surface. The second member further includes a pair of substantially circular head plates rotatably mounted on axially opposed ends thereof. The belt is fixed to, extends between, and is rotatable with the head plates such that a portion of the belt passes between the convex pressing surface and the concave pressing surface. The belt includes embedded therein a communications cable having a plurality of sensors configured to generate signals responsive to an operating parameter of the shoe press. The processing unit is in communication with the communications cable and processes signals generated by the sensors.

Abstract: The solution of the invention relates to a method and apparatus for the treatment of a paper web in a paper or cardboard machine. The essential feature of the solution of the invention is that a moving material web (1), its properties and/or its behavior are influenced by the use of a gas (2) by causing the gas (2) to flow substantially toward the material web or to its immediate vicinity.

Abstract: A sample collecting device takes samples from the white water drained from the web through the wire in the wire part, at a number of points in the cross direction of the web. An analyzer analyses the samples and forms a retention profile for controlling the paper machine. The device for measurement and regulation of the retention profile comprises means for measurement of the retention profile across the web width from different points of width of the web. The headbox comprises ducts passing to different points of width of the headbox to pass a flow of liquid containing a retention agent in the headbox into connection with the stock flow to regulate the retention profile across the web width. The ducts have valves which are regulated on the basis of the retention profile data for regulating the retention agent into duct flow.

Abstract: The stock approach piping to a multi-layered headbox can be modified to include a dilution water header that independently supplies dilution water, such as whitewater, to multiple CD segments or zones of the tube bank which supply stock to each layer. The CD basis weight profile of the final sheet is monitored and, in response to the measured CD profile, dilution water flow is increased or decreased to those tube bank segments that need their consistency altered. By selectively controlling the basis weight of distinct segments of the CD profile for each layer, a more uniform sheet can be produced.

Abstract: A method and an apparatus are provided for measuring the amount of entrained gases in a liquid sample. A conduit defining a volume is provided. The conduit has an inlet at a lower end thereof and an outlet at an upper end thereof. Liquid sample is made to flow into the inlet, through the conduit, and out of the outlet. The weight of the liquid sample in the conduit is determined during a flow of liquid sample through the conduit to obtain a first measurement. Thereafter, a difference between the first measurement and a predetermined weight value representing a weight of the same liquid sample flowing through the conduit but containing no entrained gases is determined to obtain a calculated weight of entrained gases in the liquid sample flowing through the conduit.

Abstract: An atomizing nozzle for use with a rewet shower or a steam box. The nozzle has first and second orifices and a pressure port which allows the pressure between the orifices to be measured. The nozzle also has a pressure port upstream of the two orifices that allows for the measuring of the regulated water pressure from an actuator attached to the atomizing unit. The measured pressures can be used to determine if either orifice is completely blocked or if one orifice is partially blocked or the other orifice is worn.

Abstract: In a paper machine which comprises process elements and a measuring beam, the measuring beam is arranged at least at one paper machine process element so that a measuring device for measuring quality properties of a paper web is arrangeable in the measuring beam. The paper machine process element is e.g. a blow box, which is arrangeable in a dryer unit of the paper machine between drying cylinders to blow air via at least one blow air channel provided in the blow box to guide the moving paper web and/or to assist drying.

Abstract: The present invention relates to a method for producing and testing a fiber bed (39), includes a housing (12), a main inlet passage (14) and a main outlet passage (16), a cavity (18) in said housing in fluid connection with said inlet and outlet passages, a body (20) rotatably arranged in said cavity, said body being arranged with a through-going passage (24) having a first and a second opening, a screen (25) arranged in said through-going passage, and means (40) for measuring properties of the fiber bed.

Abstract: In controlling the dryer section of a paper machine, the basis weight and moisture of the paper web, the energy fed into the drying cylinders of the dryer section and the machine speed are measured, and then the surface temperature of the drying cylinders is predicted on the basis of the measured values. At the same time, the actual surface temperature of the dryer cylinders is also measured, and if the measured value deviates from the predicted value, any defects in the drying apparatus can be detected quickly. In another aspect, a determination is made of the normal correlation between the power consumption of the drive motors of the cylinders in the drying apparatus and the machine speed. These variables are also measured, and if the correlation of the variables is deviant, it can be concluded that there is a failure in the drying apparatus. In that case it is possible to identify the dryer cylinder where the failure is by measuring the temperature of the cylinders.

Abstract: The present invention provides a method of manipulating dryer steam pressure in a paper machine during grade change. In the method, a change in the moisture percentage is determined from a change in the production mount during grade change, dryer steam pressure is manipulated so as to cancel the change in the moisture percentage, and the production amount in the course of grade change is calculated from basis weight and machine speed before and after the grade change.

Abstract: An arrangement for measuring properties of a moving paper web. The arrangement comprises measuring means for measuring paper properties, in connection with which a plane-like support surface is arranged. The plane-like support surface supports the paper web and extends substantially over the whole width of the paper web in the cross-direction relative to the direction of travel of the paper web. An opening arrangement formed by at least one opening is arranged on the support surface for measuring properties of the paper web.

Abstract: Apparatus for the production of cellulose paper pulps from vegetative masses, comprising: a tower for sterilizing the mass to form a culture medium; a first screw for mixing the sterilized mass with an inoculum and handling the same in a sterile environment; a first conditioning and reaction chamber for mixing and handling the inoculated mass in a sterile environment and controlled atmosphere of CO2 and O2, with controlled temperature and pH; a hydraulic pulper for the elementarization of the mass and its soaking up with suspensions of enzyme mixes; a hammer mill for the elementarization of vegetative material, to break up knots of stems and to pulverize leaves, detach bast from wood; a rotating tumbler having reels and counter reels for separating various fractions; a rotor compactor to reduce the volume of the vegetable mass and to remove air contained in the same; a second screw for mixing the compacted vegetetative mass with extracts containing enzymes and with water for handling in a sterile environment;

Abstract: Includes a sensor section (240) which irradiates light onto paper that is being conveyed and which detects a quantity of light transmitted through the paper, and a type-of-money judging section (290) and a number-of-sheet-of-paper collating section (320) which correct a light transmission quantity when the external shape of paper obtained from the light transmission quantity coincides with a prescribed shape and also when the light transmission quantity is lower than a pre-set threshold value, and judge types of money and a number of sheets of paper based on a result of this correction.

Abstract: A method and an equipment for regulation of the initial part of the dryer section in a paper machine. Moisture is removed from the paper web in the press section (10) and the paper web is dried in the dryer section (R). The paper web is dried against heated faces of drying cylinders (20). The surface temperatures of the first drying cylinders (20) in the dryer section (R) are measured. The dry solids content/moisture content of the paper web (W) and the temperature of the paper web (W) before said first drying cylinders (20) are measured. In view of producing the desired running situation, based on the measurement results obtained, the surface temperatures of said first drying cylinders (20) and/or the dry solids content/moisture content and/or the temperature of the paper web (W) before said first drying cylinders (20) is/are regulated.

Abstract: The invention relates to a method and an arrangement for controlling a sheet-making process. In the solution, a sheet matching desired values is manufactured. A measuring unit measures the state of the process to produce one or more measurement value representing the state of the process. A comparator compares each measurement value with a corresponding desired value and, on the basis of the comparison, forms an error representing the difference between at least one measurement value and desired value. A control unit forms at least two control action candidates based on the error using at least two process models, of which at least one is a perturbed process model. A processing unit forms one control action from the control action candidates, with which control action the sheet-making process is controlled to produce a sheet matching the desired values.

Abstract: Apparatus and process for producing foam formed fibrous web in which the furnish is made up by mixing a thin water slurry of fibers at a consistency in the range of from about 0.5 to about 7 weight percent fibers with sufficient aqueous foam containing a surfactant and having an air content in the range of from about 55 to about 80 percent by volume to form a foamed fiber furnish containing from about 0.1 to about 3 weight percent fibers which is supplied directly to the forming felt or wire of a twin wire papermaking machine, adding makeup surfactant and discarding excess aqueous foam from the process as required to maintain the desired volume of foamed liquid therein.

Abstract: Multiple two-dimensional variation patterns are extracted from two-dimensional sheet measurement data of sheet material being manufactured with the variation patterns being classified to identify the causes of the extracted patterns. The extracted two-dimensional variation patterns are identified with the elements or components of the process or machine which caused the patterns. The machine components which cause the variation patterns can then be adjusted and/or controlled so that the patterns can be reduced or substantially eliminated in sheets of material produced by the machine. In addition to adjustment and/or control of the process or machine producing the sheet of material, the extracted variation patterns can be used as new representations of sheet quality, process or machine quality and the patterns will provide more in-depth understanding for operators of the machine.

Abstract: In the production of de-inked pulp, measuring devices are used to register spectral and/or physical characteristic values of a starting material. These values are then fed to a neural network, by means of which correction variables are obtained for a regulating or controlling device which in provided. According to the invention, the measuring device is used to evaluate at least the starting materials of the production of pulp and/or paper. The evaluation of the characteristics of the raw material used in the production of pulp and paper is thereby possible.

Abstract: A sample collecting device takes samples from the white water drained from the web through the wire in the wire part, at a number of points in the cross direction of the web. An analyzer analyses the samples and forms a retention profile for controlling the paper machine. The device for measurement and regulation of the retention profile comprises means for measurement of the retention profile across the web width from different points of width of the web. The headbox comprises ducts passing to different points of width of the headbox to pass a flow of liquid containing a retention agent in the headbox into connection with the stock flow to regulate the retention profile across the web width. The ducts have valves which are regulated on the basis of the retention profile data for regulating the retention agent into duct flow.

Abstract: The object of the invention is a sampling apparatus in a continuous industrial process for taking a sample of the substance to be monitored. The sampling apparatus is located on the wall of the pulp tank and it includes a sample chamber, which is equipped with a cover, and a filter. The sample chamber includes a closing device, by means of which the connection from the pulp tank to the sample chamber can be closed, as a result of which the filter remains in the sample chamber in the space between the cover and the closing device. The filter can be pulled out of the sample chamber for cleaning after the cover of the sample chamber has been opened. Another object of the invention is a sampling method and a cleaning method for the sampling apparatus presented.

Abstract: Properties of paper are controlled by modeling the effect of at least one variable (fD) of the paper dryer section on the paper moisture (Moi) and the effect of the stock flow (Fts) and/or stock composition and the flow of retention agent (Fra) on the paper moisture (Moi). By means of the modeling, the paper moisture (Moi) is adjusted by simultaneously controlling at least one variable (fD) of the paper dryer section, the stock flow (Fts) and the flow of retention agent (Fra).

Abstract: A device to actively reduce undesirable vibrations in a rotating roll includes at least one sensor arrangement to detect/measure the undesirable vibrations and at least one power unit device which, dependent upon the detecting/measuring result, influences the roll to reduce the undesirable vibration. The sensor arrangement includes at least one sensor which, relative to the rotational axis of the roll, is located radially inside the substantially circular cylindrical outer surface of the roll and/or at least one sensor which is located remotely from the substantially circular cylindrical outer surface of the roll.

Abstract: A method for providing a wire for forming a patterned fiber web, a wire which has been provided by means of the method according to the invention and a patterned fiber web formed on the wire (100) according to the invention, which comprises a plurality of threads (101, 102, 103, 104, 105, 106) arranged in a wire structure with a plurality of drainage opening (107, 108, 109) and a patterning area (110) substantially in the plane of the wire, intended for the forming. In the method a number of the threads (103, 104, 105) are given a permanent deformation for forming one or several pattern creating surfaces (111) within the patterning area (110) at the forming. The invention may be applied in relation to production of soft tissue paper, wet pressed non woven materials, air laid non woven materials, or at the production of hydraulically patterned or entangled non woven materials.

Abstract: A calender press for use in a paper-making machine includes a top roll positioned adjacent to a nip and rotatable about a longitudinal axis thereof. The top roll has a length and circumferential perimeter. The length extends in the direction of and is longer than the width of the fiber web. The top roll is thermally compensated in a plurality of thermal zones which are adjacent to each other across the length of the top roll, whereby the perimeter of the top roll may be adjusted in a locally adjustable manner toward and away from the nip. A bottom roll is positioned adjacent to the top roll and defines the nip with the top roll. The bottom roll is rotatable about a longitudinal axis thereof and has a length and circumferential perimeter. The length extends in the direction of and is longer than the width of the fiber web. The perimeter is smaller at each longitudinal end of the bottom roll and larger at approximately a midpoint between the longitudinal ends, thereby defining a crowned bottom roll.

Abstract: Paper or cardboard machine and method for regulating a basis weight of a paper or cardboard web in the manufacturing process. The paper or cardboard machine includes at least one headbox that extends across a machine width. The at least one headbox is adapted to provide a machine-wide distribution of a material suspension onto one of a screen and between two screens. The machine also includes at least one material suspension supply coupled to the at least one headbox and adapted to supply a material suspension to the at least one headbox. The at least one material suspension supply has at least one concentration.

Abstract: A method and apparatus effect drying of a paper web using a plurality of heated drying cylinders and at least one air impingement module having a hood. The paper web is brought into operative contact with the heated drying cylinders, and at least one of the final moisture content, quality, and cross-direction profile of the paper web is regulated. The regulation is effected by adjusting the efficiency of air impingement drying of the paper web, by adjusting at least one of the blowing velocity of the medium (typically air) blown against the paper web, the humidity of the blowing medium, and the distance of the hood of the impingement module from the paper web. At least one of the final moisture content of the paper web and its quality may also be regulated by adjusting the steam pressure of one or more drying cylinder groups.

Abstract: The invention concerns an equipment in a paper/board machine for regulation of the difference of draw. In the solution in accordance with the invention, the difference of draw in the web is regulated on the basis of the measured tension of the web. Preferably, the regulation of the difference of draw takes place by regulating the drives at the inlet and/or outlet of a web run not supported by a wire.

Abstract: A method and an equipment for regulation of the initial part of the dryer section in a paper machine. Moisture is removed from the paper web in the press section (10) and the paper web is dried in the dryer section (R). The paper web is dried against heated faces of drying cylinders (20). The surface temperatures of the first drying cylinders (20) in the dryer section (R) are measured. The dry solids content/moisture content of the paper web (W) and the temperature of the paper web (W) before said first drying cylinders (20) are measured. In view of producing the desired running situation, based on the measurement results obtained, the surface temperatures of said first drying cylinders (20) and/or the dry solids content/moisture content and/or the temperature of the paper web (W) before said first drying cylinders (20) is/are regulated.