537results about "Press section" patented technology

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 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.

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.

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.

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.

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

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 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.

The invention discloses a nano boron nitride composite meta-aramid paper-based insulating material and a preparation method thereof, and relates to the technical field of insulating materials. The preparation method comprises the following steps: respectively dispersing meta-aramid fibrid and meta-aramid chopped fiber into fibrid slurry and chopped fiber slurry, mixing, adding hexagonal boron nitride nanosheet dispersion liquid and a retention aid for reaction to obtain uniform composite slurry, and shaping to obtain the nano boron nitride composite meta-aramid-based insulating material. The material is well matched with dielectric constant transformer oil, the dielectric loss is still at a lower level, meanwhile, the characteristic breakdown strength and the heat conductivity are synergistically improved, and the multifunctional requirements of high-power electrical equipment for insulating materials are met.

The invention discloses a preparation method of degradable napkin based on natural plant fibers, and relates to the field of hygienic products. According to the preparation method of the degradable napkin based on the natural plant fibers, natural cellulose raw materials such as the sisal hemp waste residues and the banana stalks are adopted, the source is wide, and the cost is low. Raw materials are cleaned, crushed and degummed to prepare crude fiber bundles, and the crude fiber bundles are converted into soft microfibrillated cellulose colloid through enzyme treatment. Defibering part of the colloid into long-fiber matrix pulp, homogenizing the other part of the colloid at high pressure to prepare short-fiber reinforced pulp, mixing the long-fiber matrix pulp and the short-fiber reinforced pulp to obtain reinforced pulp, and performing papermaking, drying and calendering to prepare the raw paper. According to the process, through fiber softening treatment, the softness and hand feeling of the paper are remarkably improved while the toughness is kept, and the process is suitable for napkin production. A green biotechnology is adopted in the whole process, the pollution load is low, chemicals are biodegradable, and the requirements for low cost and environmental protection are met.

The invention discloses a carbon fiber paper-based material and a continuous calendering enhancement method thereof. The preparation method specifically comprises the following steps: repulping, grinding, defibering and sieving meta-aramid pulp, and then mixing with defibered and dispersed short carbon fibers to prepare paper pulp; sequentially carrying out forming, dewatering, squeezing and drying treatment on the slurry to obtain a carbon fiber base paper coiled material; and carrying out continuous calendaring enhancement treatment on the carbon fiber raw paper coiled material to obtain the carbon fiber paper. According to the method, the purpose that the temperature is higher than the glass transition temperature (larger than or equal to 273 DEG C) of the meta-aramid pulp can be achieved, the purpose of conducting hot pressing on the carbon fiber base paper can be achieved, the large-batch and continuous production requirements of the carbon fiber paper can be met, and the production efficiency is greatly improved.

A press cover for a press roll or a transport belt has at least one polyurethane-containing layer. The polyurethane is obtainable by reaction of i) a polyol component, ii) an isocyanate component, and iii) a component containing at least one crosslinker. The polyol component is composed of mutually different structural units having the general formula —O—R1—X—R2—O— in which all of R1 and R2 independently of one another are identical or different and are linear or branched C1-C20 alkylene groups. Groups X are identical or different and are selected from bond, O, C(O)—O, and O—C(O)—O. At least 70 wt % of the structural units meet the following criteria: a) at least 80% of X are O—C(O)—O and the remainder are O or C(O)—O, and b) the average chain length of R1 and R2 is 8 or more carbon atoms, and c) at least 50% of R1 and R2 are independently of one another a linear or branched C8-C12 alkylene group.

Displacement dewatering system, methods and apparatus, for liquid dewatering a nascent paper web in a papermaking machine nip. A press roll presents pressurized gas to the web through one or more stationary pressure zones. Each pressure zone has a seal assembly which bears on the inside surface of the outer shell of the press roll, isolating the respective pressure zone from any adjacent pressure zones. Pressurized gas passes through the one or more pressure zones, thence into and through apertures in the shell, thence into and / or through the web. A vent receptive device receives air and water exiting the web. Methods and apparatus are provided for controlling seal temperature and / or seal pressure and / or seal friction, as well as controlling light leaking past the seal.

The invention discloses a manufacturing method of an environment-friendly paper product. The environment-friendly paper product is prepared from the following raw materials in parts by mass: 60-70 parts of a main fiber raw material, 25-35 parts of an auxiliary fiber raw material, 3-8 parts of an environment-friendly additive and 1-2 parts of a pretreating agent. By means of the components, by adding the auxiliary fiber raw materials, the environmental protection property is remarkably improved, waste cotton and linen and agricultural waste are converted into papermaking raw materials, consumption of primary fibers is reduced, meanwhile, waste recycling is achieved, and pollution caused by incineration and landfill is reduced. The auxiliary fibers and the main fibers have a synergistic effect and are matched with the environment-friendly auxiliaries to reinforce the quality of the paper, the cotton and linen fibers improve the flexibility, the agricultural waste fibers enhance the stiffness, lignin and short fibers are separated through low-temperature pyrolysis, impurities are prevented from affecting the performance of the paper, and solid powder rich in the lignin and the short fibers is recycled and reused.

The utility model relates to a device for preventing paper leading roller of paper machine and paper machine, including: paper leading portion and spraying portion, the paper leading portion includes paper leading roller, vacuum suction box and paper leading blanket, vacuum suction box is provided at the input end of paper leading roller, the paper leading blanket is covered outside the paper leading roller, and the spraying portion is provided with the vacuum suction box and the paper leading blanket. The vacuum suction box is covered with the paper injection blanket; the spraying part comprises at least two groups of spraying pipes and a plurality of sprayers, the at least two groups of spraying pipes are symmetrically arranged on two sides of the paper injection blanket, the at least two groups of spraying pipes are arranged between the vacuum suction box and the paper injection roller, the plurality of sprayers are arranged on the spraying pipes, and the sprayers directly face the paper injection blanket. According to the utility model, the problem of edge drop of the paper guide roller caused by high initial air permeability of the blanket can be avoided, and the operation efficiency of the paper machine is improved.

This invention provides a boot-shaped press belt with suppressed strength imbalances between components and excellent strength, as well as a method for preparing the boot-shaped press belt. A boot-shaped press belt for a paper machine has at least one resin layer comprising a polyurethane resin containing an isocyanate prepolymer cured by a curing agent having active hydrogen groups. The urethane prepolymer is obtained by reacting a polyisocyanate compound containing 4,4'-methylenebis(phenyl isocyanate) with a polyol compound containing polytetramethylene ether diol. The curing agent comprises polycarbonate diol.

The invention relates to a method for adjusting a component, in particular a functional roller, for a machine for producing or processing a fibrous web, the component having at least one adjustment device for adjusting an operating state of the component, the method comprising the following steps: carrying out an image capture and / or video capture of the exterior of the component and transmitting the capture to a computing unit; determining an actual value of the operating state by means of the computing unit by image analysis of the image capture and / or video capture of the exterior of the component and / or by the acquisition of values from an embedded sensor system. On the basis of the determined actual values of the operating state: presenting metainformation regarding the adjustment of the adjustment device by overlay with the image capture and / or video capture on a display.

The utility model discloses a reciprocating motion piece for a vacuum roller and a stable supporting device of the reciprocating motion piece, and belongs to the technical field of vacuum rollers. Comprising two sets of mounting bases arranged side by side, the mounting bases are frame bodies with hollow middles, a driving motor is mounted at the end of one mounting base, the output end of the driving motor is connected with a transmission assembly, two sets of driving assemblies are mounted at the top of the mounting base, the driving assemblies are located at the two ends of the transmission assembly, and the driving assemblies are in transmission connection with the transmission assembly; the transmission assembly drives the two driving assemblies to rotate in the opposite directions, moving assemblies are slidably mounted on the top face of the mounting base in the length direction of the mounting base, and the moving assemblies are in engaged connection with the driving assemblies to drive the moving assemblies to be close to or away from each other. According to the utility model, the operation process is simplified, the possibility of manual misoperation is avoided, the roller is driven by the moving component to reciprocate, the roller can be prevented from repeatedly wearing the fixed position of the vacuum roller, and the service life of the vacuum roller is prolonged.

The utility model relates to the technical field of squeezing parts, in particular to a vacuum squeezing dewatering roller set for papermaking, which comprises a support, a squeezing roller, a sliding plate, a nozzle, a cleaning structure and a fixing structure, auxiliary rollers are symmetrically and rotatably connected in the support, the squeezing roller is rotatably connected below the auxiliary rollers in the support, and the sliding plate is arranged on the sliding plate. A sliding plate is fixedly connected into the support, a reciprocating screw rod is rotatably connected into the sliding plate, a spray head is slidably connected to the side, close to the press roll, of the sliding plate, a sliding block is rotatably connected to the end, close to the reciprocating screw rod, of the spray head, and the sliding block is in meshed connection with the reciprocating screw rod; the cleaning structure comprises a brush seat, the brush seat is slidably connected to the position, located on one side of the press roll, in the support, and a fixing structure used for fixing the brush plate is installed in the brush seat. The vacuum press dewatering roll set for papermaking has the advantages of being automatic in cleaning and maintenance, fast in brush plate replacement and capable of collecting waste water.

This utility model discloses a composite suction zone papermaking vacuum roll core, belonging to the field of papermaking vacuum rolls. The outer end of the roll core's rotating shaft is connected to an assembly roller via a bearing assembly. A vacuum roll sleeve is provided between two assembly rollers. Multiple inserts are provided on the side wall of the vacuum roll sleeve, and the side wall of the assembly roller has fitting slots that mate with the inserts. The insertions and fittings achieve a limiting connection between the assembly roller and the vacuum roll sleeve. The cooperation between the inserts and fittings enables a quick limiting connection between the vacuum roll sleeve and the assembly roller, simplifying assembly and disassembly, ensuring precise alignment, and guaranteeing stable and efficient papermaking liquid suction operation. The spiral connecting strip and flow hole design ensure a firm connection between the vacuum roll sleeve and the spiral connecting strip, improving the liquid suction effect, facilitating quick replacement, and reducing maintenance costs. Vacuum nozzles evenly installed on the roll core generate suction through the internal vacuum chamber, efficiently adsorbing liquids such as pulp. The quick assembly / disassembly system allows for rapid assembly and disassembly when changing vacuum nozzles, reducing downtime and improving equipment utilization.

Composite material comprising a matrix material (5) and a reinforcing structure (6) which is embedded in the matrix material (5), characterized in that the reinforcing structure (6) comprises or consists of a mixed textile (1), wherein the mixed textile (1) comprises both sustainable fibers (2) and reinforcing fibers (3).

A machine or apparatus for producing structured tissue or towel using a press section.