874results about "Press section" patented technology

The invention discloses a method for manufacturing a multiply paperboard comprising the steps of: - forming a web comprising at least a top ply, a back ply, and a middle ply arranged between the top ply and the back ply, wherein the middle ply is formed from a first furnish comprising at least 50 wt% of a HT-CTMP and 0.1 – 10 wt% of glue pulp based on the total dry weight of said first furnish, wherein said glue pulp has a Schopper Riegler (SR) value in the range of 55- 84 as measured according to standard ISO 5267-1 and a mass fraction of fines of less than 25% as measured according to standard ISO 10376:2011, - subjecting the thereof formed three-ply web to pressing in at least one shoe press, and - drying the web. It has been found that the combination of using the said furnish mixture including HT-CTMP and glue pulp with an SR value within said range enables efficient dewatering by use of a shoe press and gives rise to a paperboard with high bulk but maintained or improved strength properties.

Creped fibrous structures having pillows and knuckles, wherein the creped fibrous structures may exhibit improved knuckle properties, such as Knuckle Roughness Ra, Knuckle Roughness Rq, and Knuckle Creping Frequency and methods for making same are provided, and / or may comprise elongate knuckles comprising discrete pillows and / or elongate pillows between first and second elongate knuckles.

A method of producing a paper or paperboard product having at least one ply comprising high yield pulp (HYP), comprising the steps of: – providing a furnish comprising at least 50% of high yield pulp (HYP) of a total pulp content in said furnish, said high yield pulp being produced with a wood yield above 85%; – dewatering the furnish to form a moist web and pressing said moist web to a dry solids content of at least 40–70%; and – densifying the moist web to a density above 600 kg / m3 in a press nip of a paper machine at a temperature above a softening temperature of water-saturated lignin comprised in said high yield pulp to provide a paper or paperboard product, containing at least 30% high yield pulp (HYP) of a total pulp content of said product.

There is provided a method of producing a paper- or linerboard having a grammage measured according to ISO 536:2019 of 170-310 g / m2 and comprising a print layer, a middle layer and a back layer, wherein the middle layer is formed from a middle layer furnish comprising at least 25% by dry weight CTMP and the back layer is formed from a back layer furnish comprising an unbleached pulp, such as an unbleached kraft pulp, said method comprising the step of subjecting a multi-layered web at a speed of at least 600 m / min to pressing in a press section comprising a first and a second double-felted shoe press nip arranged in series, wherein the total press impulse of the double-felted shoe press nips is at least 95 kPa*s, preferably at least 100 kPa*s.

The invention provides a sheet manufacturing apparatus capable of improving humidification efficiency. A sheet manufacturing apparatus (100) is provided with: a defibrating unit for defibrating a material to form fibers; a fiber accumulation unit (18) that accumulates fibers to form a second web (M8); a pressurizing unit that pressurizes the second web (M8) to form a sheet; and a humidification mechanism (10) that supplies humidified air (E1) to the fiber accumulation unit (18), the fiber accumulation unit (18) being provided with a rotating unit (6) that stirs the fibers supplied from the defibrating unit, a housing (3) that houses the rotating unit (6), and a mesh belt (191) that is provided below the housing (3) and that conveys the second web (M8) in the conveyance direction. A second web (M8) is formed on the mesh belt (191) by stacking fibers on the mesh belt (191). The humidification mechanism (10) has an upstream nozzle (601) that is provided upstream of the fiber stacking unit (18) in the conveyance direction and supplies humidified air (E1) to the fiber stacking unit (18).

A roller for a web processing machine, wherein the roller comprises a roller cylinder having a cylindrical roller core, a roller covering surrounding the roller core, and a lateral surface, wherein the roller covering consists of one or more roller covering layers in the radial direction and contains sensors, characterized in that an electrically conductive shield is arranged in the radial direction between the sensors and the lateral surface; a web processing machine comprising the sensor roller and a counter roller arranged parallel to the sensor roller with an intermediate treatment gap, wherein each of the sensors of the sensor roller can detect the pressure exerted on the sensor roller when passing through the treatment gap.

A sheet manufacturing apparatus includes a buffer tank 13 that stores a material containing fibers; a defibrator 30 that defibrates the material supplied from the buffer tank 13 and discharges the fibers; a mixing unit 91 that mixes the fibers and a binding material binding the fibers to each other and discharges a mixture; a first transport belt 61a that transports the mixture; an accumulation unit 50 that accumulates the mixture on the first transport belt 61a to form a web W; a second transport belt 62a that comes into contact with one surface of the web W to transport the web W; processing rollers 71 and 72 that pressurize the web W; a cleaning unit 201 that removes and recovers residual fibers adhering to the first transport belt 61a; and a fiber transport pipe 22 that transports the residual fibers recovered by the cleaning unit 201 to the defibrator 30.

A method for controlling at least one component of a press and / or dryer section of a paper machine comprises the following steps, repeated multiple times: varying (S10) a first control variable of a first component of the press and / or dryer section to approach different operating points of the paper machine, determining (S20) values ​​of a quality criterion for the operating points approached, determining (S30) a first direction of a shift of the first control variable in which the quality criterion is expected to improve, based on these determined values ​​of the quality criterion, and shifting (S10) the first control variable in the first direction.

The invention discloses a novel corrugated paper squeezing device which comprises bearing frames, a conveying belt and a squeezing assembly used for squeezing corrugated paper, the number of the bearing frames is two, the conveying belt is located between the two bearing frames, a fixing frame is arranged at one end of each bearing frame, and a first squeezing roller and a second squeezing roller are arranged in each fixing frame; and the first extrusion roller and the second extrusion roller are symmetrically arranged up and down. The squeezing flannelette outside the conveying belt can reduce tile paper friction, avoid surface scratching and assist in absorbing a small amount of water, the synchronizer controls the electric push rod to stretch out and draw back synchronously and is matched with the guide rod to enable the rotating roller to press the tile paper evenly, local overpressure damage or non-uniform underpressure dehydration is prevented, the water collecting box can collect extruded water, and the valve can drain water in time. Accumulated water is prevented from polluting equipment or flowing back, consumption of follow-up clean water is reduced, residual moisture of the corrugated paper can be further removed through secondary squeezing, moisture residues are greatly reduced, drying power does not need to be additionally increased, and power consumption is reduced.

An apparatus includes: a defibrating unit that defibrates a material to turn it into fibers; a fiber piling-up unit that piles up the fibers to form a second web; a pressing portion that presses the second web to turn it into a sheet; and a humidifying mechanism that supplies humidified air to the fiber piling-up unit. The fiber piling-up unit includes a rotating portion that stirs the fibers supplied from the defibrating unit, a case in which the rotating portion is housed, and a mesh belt that is provided under the case and transports the second web in a transportation direction. The second web is formed on the mesh belt by piling up the fibers on the mesh belt. The humidifying mechanism includes an upstream-side nozzle that is provided upstream of the fiber piling-up unit in the transportation direction and supplies the humidified air to the fiber piling-up unit.

A sheet manufacturing apparatus includes a buffer tank 13 that stores a material containing fibers; a defibrator 30 that defibrates the material supplied from the buffer tank 13 and discharges the fibers; a mixing unit 91 that mixes the fibers and a binding material binding the fibers to each other and discharges a mixture; a first transport belt 61a that transports the mixture; an accumulation unit 50 that accumulates the mixture on the first transport belt 61a to form a web W; a second transport belt 62a that comes into contact with one surface of the web W to transport the web W; processing rollers 71 and 72 that pressurize the web W; a cleaning unit 201 that removes and recovers residual fibers adhering to the first transport belt 61a; and a fiber transport pipe 22 that transports the residual fibers recovered by the cleaning unit 201 to the defibrator 30.

A method of forming a fibrous web on a papermaking machine including the steps of depositing a dilute fiber slurry out of a headbox to a forming area comprising a forming surface made up of a structured fabric, wherein the structured fabric is supported by a breast roll and a forming roll, and the forming area is devoid of any additional fabrics or belts other than the structured fabric, draining the dilute fiber slurry through the structured fabric, and drying the fiber slurry.

A method of forming a fibrous web on a papermaking machine including the steps of depositing a dilute fiber slurry out of a headbox to a forming area comprising a forming surface made up of a structured fabric, wherein the structured fabric is supported by a breast roll and a forming roll, and the forming area is devoid of any additional fabrics or belts other than the structured fabric, draining the dilute fiber slurry through the structured fabric, and drying the fiber slurry.

The invention relates to a waste water auxiliary drainage device for a rotary screen paper machine, which comprises a composite roller, a waste water drainage device and a waste water drainage device, wherein the composite roller is used for extruding coarse cotton cloth and is positioned above a screen part; the water guide mechanism is used for guiding and draining water extruded from the coarse cotton cloth; the water guide mechanism comprises a drainage assembly used for guiding water out; the energy reducing assembly is used for reducing the impact potential energy of water on the drainage assembly; and the water guide mechanism is arranged behind the composite roller along the motion direction of the coarse cotton cloth. According to the rotary screen paper machine, a traditional linear mop is improved into an innovative and adjustable splayed totally-closed dewatering device, so that the problem of water removal in a composite area of the rotary screen paper machine is successfully solved, and the quality of a final product is effectively improved.

The utility model relates to the field of paper machines, and discloses a press roll for a paper machine, which comprises a first press roll and a second press roll which are oppositely arranged, a first moving part for driving the first press roll to move, and a second moving part for driving the second press roll to move. Firstly, the second moving part is adjusted to achieve large adjustment of the distance between the first press roll and the second press roll in a large range, and after large adjustment is completed, the first moving part is arranged to control the first press roll to ascend and descend so as to achieve fine adjustment of the distance between the first press roll and the second press roll; and the bevel gear II and the bevel gear rotate to drive the threaded rod to rotate, so that the threaded rod rotationally ascends or descends to drive the sliding column to move upwards or downwards relative to the fixed column, the movable plate I and the first press roll move along with the sliding column, and fine adjustment of the distance between the first press roll and the second press roll is realized. The utility model has the advantages and effects that the distance between the squeezing rollers is convenient to adjust, and the squeezing efficiency is high.

According to an aspect of the present invention, there is provided a sleeve for a drum for use in forming, pressing or moulding a fibrous web, wherein the sleeve comprises at least two parts and each part has a form of an open-ended cylinder with two edges, configured to be arranged concentrically on the drum. At least one edge of each part has a peripheral locking form, and adjacent edges of adjacent parts have corresponding cooperating peripheral locking forms adapted to lock the parts to each other.

The invention relates to a press arrangement and a method for pressing a fibrous web, comprising a main press with an extended press nip, wherein the press nip has a length of at least 150 mm, wherein the main press is a shoe press comprising a press shoe with a substantially concavely curved surface and a shoe press cover rotatably mounted around the press shoe, wherein the main press is designed such that a line load ratio LLR of at least 0.56 and at most 1.52 results, wherein the line load ratio LLR is the quotient of a weighted line load WLL to the line load LL, wherein the weighted line load WLL is the result of an integration of the quadratic local pressure p(x)2 weighted with a weighting factor A over the press nip length x, wherein the weighting factor A is one divided by ten megapascals,and wherein the line load LL is the result of an integration of the local pressure p(x) over the press nip length x, so that the following formula results for the line load ratio LLR: LLR=WLLLL=∫A*px2dx∫pxdx=∫110MPa*px2dx∫pxdx wherein the shoe press cover consists at least partially of polyurethane, which is formed by reacting a prepolymer and a crosslinker component, wherein the prepolymer is a reaction product of 1,4-phenylene diisocyanate (PPDI) and a polyol component containing at least polytetramethylene ether glycol (PTMEG) and / or Cs-s-polycarbonatediol, wherein the crosslinker component comprises 1,6-hexanediol, and wherein the press cover has at least one drainage groove and / or at least one blind bore.

To provide a sheet manufacturing apparatus capable of suppressing waste of raw materials.SOLUTION: A sheet manufacturing apparatus includes: a buffer tank 13 that stores materials containing fibers; a defibrator 30 that defibrates the materials supplied from the buffer tank 13 and discharges the fibers; a mixing section 91 that mixes the fibers with a binder that binds the fibers to each other and discharges the mixture; a first conveyor belt 61a that conveys the mixture; a deposition section 50 that deposits the mixture on the first conveyor belt 61a to form a web W; a second conveyor belt 62a that comes in contact with one side of the web W to convey the web W; treatment rollers 71, 72 that apply pressure to the web W; a cleaning section 201 that removes and collects remaining fibers adhering to the first conveyor belt 61a; and a fiber conveyor pipe 22 that conveys the remaining fibers collected by the cleaning section 201 to the defibrator 30.SELECTED DRAWING: Figure 1

The invention relates to a machine (1) and to a corresponding method for producing an air-laid fibrous web (309). The machine (1) comprises: a) a raw material preparation system for a low-water preparation of cellulose-containing fibers in order to form individual fibers and / or fiber bundles (209); b) a dry-forming device (4) for dry-forming the individual fibers and / or fiber bundles (209) in an air stream in order to form a flat fiber fabric (300) on a forming belt (40); c) an application device (71) for applying a fluid, preferably water and / or a water-additive mixture, to the fiber fabric (300); d) a solidifying device (8) for solidifying the flat fiber fabric (300) by applying pressure in a press nip (80) when the fiber fabric (300) is guided through the press nip (80) on a press belt (41) onto which the fiber fabric (300) was previously transferred from the forming belt (40) in a transfer region (100); and additionally a fluid depositing device which is designed to then deposit the fluid on the press belt (41), the press belt (41) serving as an application device (71) for applying the fluid to the fiber fabric (300).

An electronic device for determining a location of a seal strip device in a strip of a papermaking machine includes a seal strip location identification component associated with the seal strip device, a current monitoring circuit configured to measure a current through the seal strip location identification component that is associated with the seal strip device, and a location circuit configured to transmit information related to the current through the seal strip location identification component, and configured to receive an address related to the location of the seal strip device. Related methods and systems are also described.

The present invention relates to a method for producing a microfibrillated cellulose (MFC) web. The method comprises providing an MFC suspension (2) comprising water as suspension medium. A wet MFC web (4) is formed of the MFC suspension by casting on a non-porous support (5). The wet MFC web (4) positioned on the non- porous support (5) is subjected to water removal by means of press dewatering and / or non-contact drying to form a dry MFC web (8). The water removal further comprises at least one induction heating step, wherein each induction heating step comprises heating said wet MFC web (4) by means of an induction heated device (10). The dry MFC web (8) is separated from the non-porous support (5).

A sheet manufacturing apparatus includes a defibrator that generates a defibrated material, a accumulating portion that forms a web by accumulating the defibrated material, and a sheet shaping portion that includes a first roller and a second roller, and forms a strip-shaped sheet by pressing the web. The sheet shaping portion includes a first roller retention unit at which the first roller is installed, a drive motor, a gear to which rotation of the drive motor is transmitted so as to rotate the second roller, a first transmission gear to which rotation of the gear is transmitted, a one-way clutch gear installed at the same rotating shaft as the first transmission gear, a gear to which rotation of the one-way clutch gear is transmitted, a cam installed coaxially with the gear, and a pin that is fixed to the first roller retention unit and performs positioning of the first roller retention unit by coming into contact with the cam. The first transmission gear includes an idling mechanism capable of running idle over a certain period.

To provide a method for producing a sheet capable of producing a sheet having sufficient strength dispensing with a resin.SOLUTION: A method for producing a sheet includes: a web-forming process of accumulating a defibrated product by a dry method to form a web; a water-supplying process of supplying water to the web; a pressurizing process of pressurizing the web supplied with water; and a heating process of heating the web supplied with water, where the water content of the web supplied with water in the water-supplying process is 12 mass% or more, the pressure applied to the web in the pressurizing process is 0.2 MPa or more, and the temperature of the web in the heating process is 100°C or lower.SELECTED DRAWING: Figure 2

To prevent risk of deforming a sheet that is molded by pressurizing and heating a web.SOLUTION: A sheet manufacturing device 1 has an accumulation part 50 to form a web W, a molding part 70 to mold the web W into a sheet P1, and a control part 5. The molding part 70 comprises: a first roller 72 to heat the web W and the sheet P1; a second roller 73 to nip the web W between itself and the first roller 72; a winding roller 74 that is disposed on the downstream side of the first roller 72 and winds the sheet P1 around the first roller 72; press rollers 761, 762, 763 that press the sheet P1 wound around the first roller 72 against the first roller 72; and a press roller moving part 77 to change positions of the press rollers 761, 762, 763. The control part 5 controls the press roller moving part 77 based on a position of a tip of the sheet P1.SELECTED DRAWING: Figure 11

An electronic device for determining a location of a seal strip device in a strip of a papermaking machine includes a seal strip location identification component associated with the seal strip device, a current monitoring circuit configured to measure a current through the seal strip location identification component that is associated with the seal strip device, and a location circuit configured to transmit information related to the current through the seal strip location identification component, and configured to receive an address related to the location of the seal strip device. Related methods and systems are also described.

A sheet manufacturing apparatus includes a defibrator that defibrates a paper piece to form a defibrated material, an accumulator that accumulates the defibrated material on a mesh belt to form an accumulating material, a forming machine that forms the transported accumulating material to produce a strip-shaped sheet, and a return mechanism that sends a residual accumulating material that is the defibrated material being accumulating to the defibrator on condition that the accumulator has stopped or is stopped during accumulation.

The utility model discloses a paper machine squeezing dewatering roller water collecting device which comprises a machine frame, an upper compression roller and a lower compression roller are installed on the machine frame, dewatering conveying cloth is conveyed between the upper compression roller and the lower compression roller, a concave water collecting plate with an inclined downward angle is arranged below the dewatering conveying cloth, and the concave water collecting plate is arranged on the machine frame. The outer end of the concave water collecting plate is fixedly connected with a water collecting tank, the outer end of the concave water collecting plate extends into an inner cavity of the water collecting tank, the water collecting tank is installed on the rack, the bottom wall of the water collecting tank is communicated with a drainage pipe, and the bottom end of the drainage pipe extends into an inner cavity of a water storage tank; the beneficial effects of the utility model are that the concave water collecting plate can collect the water pressed out by the dehydration conveying cloth into the water collecting tank, and finally the water flows into the water storage tank for temporary storage, thereby preventing the operation ground from being polluted due to the splashing of the squeezed and dehydrated water, and preventing operators from slipping and being injured.

The present invention relates to a tissue paper machine (100) comprising - a forming section (101), - a drying section (102) comprising a Yankee dryer (20) and a non-dewatering transfer nip formed (TN) between the Yankee dryer (20) and a press assembly (30) for transferring the paper web (W) from the structured fabric (10) to the Yankee dryer (20), - a structured fabric (10), wherein the transfer nip (TN) is an extended press nip, the press assembly (30) comprising a press shoe (31) and an actuator (60) configured to operate the press shoe (31) to form the transfer nip (TN), and wherein the actuator (60) is configured to generate a desired linear load in the transfer nip (TN) by operating the press shoe (31) to extend into the transfer nip (TN) with a desired pressure and to change the linear load during operation of the tissue paper machine (100).

A method of forming a fibrous web on a papermaking machine including the steps of depositing a dilute fiber slurry out of a headbox to a forming area comprising a forming surface made up of a structured fabric, wherein the structured fabric is supported by a breast roll and a forming roll, and the forming area is devoid of any additional fabrics or belts other than the structured fabric, draining the dilute fiber slurry through the structured fabric, and drying the fiber slurry.