781results about "Dryer 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.

The present invention belongs to the technical field of special paper preparation, and particularly relates to a production method of high-strength aluminized base paper, comprising the steps of: S1, beating: respectively beating long-fiber primary pulp and short-fiber primary pulp, wherein the beating degree of the long fiber is 40-50°SR, and the beating degree of the short fiber is 20-30°SR; S2, adding additives: adding modified inorganic filler, cationic starch and retention aid to the short-fiber pulp; S3, pulp mixing: mixing the long-fiber pulp and the short-fiber pulp according to a weight ratio, and then adding modified bamboo fiber, and uniformly stirring to form a mixed pulp; S4, wire drawing and papermaking; S5, spraying a surface treatment agent; S6, paper drying, calendering and winding. The aluminized base paper obtained by the production method of the high-strength aluminized base paper of the present invention has the advantages of high strength and good smoothness.

The utility model provides a paper stabilizer, which is arranged in the area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, and the paper stabilizer includes: a main structure; an exhaust duct, the first end of the exhaust duct is a closed port, and the second end of the exhaust duct is an exhaust port; an air supply duct, the air supply duct is spaced from the exhaust duct, and the first end of the air supply duct is an air supply port; a negative pressure balance duct, along the transverse direction of the paper stabilizer, the negative pressure balance duct connects the first inner cavity and the second inner cavity. By setting a negative pressure balance duct to connect the first inner cavity corresponding to the downward zone of the paper stabilizer and the second inner cavity corresponding to the upward zone, the negative pressure between the first inner cavity and the second inner cavity is balanced, which improves the stability of the paper stabilizer during operation and reduces the shaking of the paper web. Such uniform negative pressure can keep the paper web flat and reduce the local warping or depression of the paper web.

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 belongs to the technical field of environment-friendly paper materials, and provides environment-friendly fireproof flame-retardant paper and a preparation method thereof, and the environment-friendly fireproof flame-retardant paper is prepared from the following raw materials in parts by mass: 20-40 parts of alginate fiber, 50-80 parts of bamboo pulp fiber, 5-15 parts of a flame retardant, 2-5 parts of chitosan, 1-3 parts of nano silicon dioxide and 200-400 parts of water. The alginate fibers and the bamboo pulp fibers are used as main raw materials, and the phosphorus-nitrogen environment-friendly flame retardant and the modified magnesium hydroxide are compounded, so that the dual effects of natural flame retardance and chemical synergy are achieved; according to the invention, the flame retardant and the fibers are synchronously beaten, so that nonuniformity and agent waste caused by later-stage coating are avoided; the environment-friendly fireproof flame-retardant paper is prepared from environment-friendly materials, volatile organic compounds are not discharged in the whole process, the paper can be recycled and degraded, the binding force between modified magnesium hydroxide and fibers is high, and the physical performance of the paper can be further improved.

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.

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.

A method for cleaning a belt of a through air drying papermaking machine in which a high pressure shower is configured to traverse across a width of the belt of the papermaking machine while ejecting water onto the belt, and a vacuum box is operatively connected to the high pressure shower. The high pressure shower has a width that is less than a full width of the belt.

A Yankee drier including a cylindrical mantle to which two end heads are connected, on each of which a corresponding pin is arranged, wherein the cylindrical mantle has an external surface and an internal surface, and wherein the internal surface of the mantle in cooperation with the lateral heads delimits an internal chamber of the Yankee drier in which steam can be introduced. The internal surface of the mantle is at least partially provided with a surface protective coating, the surface protective coating protecting the internal surface of the mantle from corrosive and / or abrasive agents contained in the steam introduced into said chamber.

The utility model provides a paper stabilizer, including a main structure; a pipeline assembly, the pipeline assembly includes an exhaust pipeline, an air supply pipeline and a cylinder exhaust pipeline, the cylinder exhaust pipeline is located in the lower half of the pipeline assembly, the exhaust pipeline and the air supply pipeline are located in the upper half of the pipeline assembly, the first end of the pipeline assembly is an air supply port, the second end of the pipeline assembly is an exhaust port, when the valve is in a closed state, the first sub-chamber is connected to the exhaust port, and the second sub-chamber is not connected to the exhaust port, when the valve is in an open state, the first sub-chamber and the second sub-chamber are both connected to the exhaust port. By integrating the exhaust pipeline, the air supply pipeline and the cylinder exhaust pipeline in the pipeline assembly, the structure of the paper stabilizer is made more compact, and a valve is set in the cylinder exhaust pipeline, according to different production conditions of the paper stabilizer, by controlling the opening and closing of the valve, the vacuum roller is acted on during paper feeding and paper stabilization of the paper machine, so that negative pressure is generated in the corresponding area, so that the paper web below the vacuum roller is closely attached to the surface of the vacuum roller.

The invention relates to a machine (1) and a method for producing or treating a fibrous web (F), in particular a paper, board or tissue web (F), comprising at least one machine section (2, 3, 4), preferably a dryer section (2, 4) or forming section (3), at least one thermal-energy load, preferably a steam and condensate system (5) and / or a secondary system load (70, 71, 82), and at least one thermal-energy recovery system (6), wherein a heat pump (90) extracts residual thermal energy from an exhaust-air flow of at least one exhaust-air line (84, 84') from at least one machine section (2, 3, 4) and, being additionally fed electrical energy (80), feeds thermal energy to the at least one thermal-energy load (5, 70, 71, 82), preferably to a condensate of the at least one condensate return line (58). According to the invention, the heat pump (90) is disposed in the exhaust-air line (84) such that the heat pump (90) recovers the residual thermal energy before a dew point temperature of the exhaust-air flow in the exhaust-air line (84, 84') is reached, and the steam and condensate system (5) comprises a steam accumulator (54) for storing the steam, said steam accumulator being downstream of the heat pump (90).

The utility model discloses novel drying equipment for transfer paper production, and particularly relates to the related technical field of transfer paper production, the novel drying equipment comprises a shell, a winding roller and an unwinding roller, the winding roller and the unwinding roller are both rotatably arranged in the shell, a drying mechanism for drying transfer paper is arranged in the shell, and the winding roller and the unwinding roller are arranged in the shell. A motor drives a rotating shaft to rotate, the rotating shaft drives an eccentric wheel and a rotating rod to rotate, the rotating rod can drive a swing rod to swing through a pin shaft, the swing rod drives two sets of rolling wheels to move on the surface of transfer paper through a communicating plate, and the transfer paper can be rolled and dried; and meanwhile, wind power generated by a draught fan can be conveyed into a communicating plate through a hose and then conveyed into a rolling wheel through the communicating plate, local drying treatment can be conducted while the transfer paper is rolled, and the phenomenon that the drying effect of the transfer paper is affected due to the local uneven heating phenomenon is avoided.

The present invention relates to a method for manufacturing a laminate (8) comprising a paper substrate and a microfibrillated cellulose (MFC) layer. An MFC suspension containing 50 to 100% by weight of MFC is provided. A wet MFC layer (1) is formed by casting the suspension onto a metal belt support (2), and the dry content of the formed wet MFC layer (1) is 1 to 40% by weight. A paper substrate having a Gurley-Hill air permeability of less than 10,000 s / 100 ml is provided and joined to the wet MFC layer (1) positioned on the metal belt support (2) to form a laminate structure (6). The laminate structure (6) positioned on the metal belt support (2) is dewatered to form the laminate (8). The dewatering includes at least one drying step including drying by at least one non-contact drying device (7), and the metal belt support (2) is heated during at least one drying step. The present invention also relates to the laminate (8) and a packaging material comprising the laminate (8).

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).

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 present invention relates to a method for manufacturing a laminate (8) comprising a paper substrate and a microfibrillated cellulose (MFC) layer. An MFC suspension is provided that contains 25 to 90% by weight of MFC and 10 to 50% by weight of a filler component. The suspension has a dry content of 2.5 to 50% by weight. A wet MFC layer (1) is formed by casting the suspension onto a metal belt support (2). A paper substrate having a Gurley Hill air permeability of less than 10000 seconds / 100 ml is provided and joined to the wet MFC layer positioned on the metal belt support to form a laminate structure (7). The laminate structure positioned on the metal belt support is dewatered to form a laminate. The dewatering includes at least one drying step that includes drying by at least one non-contact drying device (9), and the metal belt support is heated during at least one drying step. The present invention also relates to the laminate and a packaging material comprising the laminate.

The utility model provides a split type Yankee gas hood which comprises a Yankee gas hood body, and the Yankee gas hood body comprises a Yankee gas hood upper portion and a Yankee gas hood lower portion. The Yankee gas hood upper part comprises a side plate upper part and a crescent head upper part, a side plate upper connecting piece is arranged on the side plate upper part, and a crescent head upper connecting piece is arranged on the crescent head upper part; the Yankee gas hood lower part comprises a side plate lower part and a crescent head lower part, a side plate lower connecting piece is arranged on the side plate lower part, and a crescent head lower connecting piece is arranged on the crescent head lower part; wherein the side plate upper part is in butt joint with the side plate lower part, and the crescent head upper part is in butt joint with the crescent head lower part; the large Yankee gas hood is divided into the upper part and the lower part to be prefabricated and formed respectively, and parts are few and convenient to count while quick assembly is achieved.

The utility model belongs to the technical field of papermaking, and particularly relates to a drying machine for paper processing, which comprises a machine base, and a drying cylinder, a dosing mechanism and a medicine receiving groove are arranged on the machine base. The two ends of the drying cylinder are rotationally arranged on the machine base. The dosing mechanism is arranged at the side part of the drying cylinder, is positioned on one side where paper is forwards conveyed out of the drying cylinder and is used for regularly spraying a stripping agent to the drying cylinder; the medicine receiving groove is used for receiving the stripping agent dripping from the drying cylinder, is in a circular arc shape and is coaxially arranged below the drying cylinder. The stripping agent dropping from the drying cylinder can be received through the agent receiving groove, and the stripping agent thrown out from the surface of the drying cylinder due to the centrifugal effect after the agent adding mechanism sprays the stripping agent to the drying cylinder can be received through the position distribution of the agent receiving groove and the agent adding mechanism, so that the stripping agent is prevented from splashing and being wasted.

The invention discloses a method and a structure for improving bulk and water absorption performance of kitchen paper. The method comprises the following steps: step 1, mixing and pulping high-yield pulp and softwood pulp; 2, wet kitchen paper raw paper is manufactured through a laboratory sheet making machine; and step 3, drying by using a vacuum dryer to obtain the raw paper of the kitchen paper in a dry state. The bulk and porosity of the raw paper of the kitchen paper are effectively improved, the water storage space of finished paper is increased, and the water absorption rate and water absorption capacity of the kitchen paper are increased; in addition, the water absorption performance, the softness and the skin-friendly degree of the kitchen paper are remarkably improved, so that the kitchen paper is more relaxed than traditional kitchen paper when a large amount of water is accumulated.

Various implementations include a tissue product that includes a through-air dried tissue ply including a three-dimensional topography. The three-dimensional topography defines a first design element and a second design element encompassed within and discontinuous from the first design element. Various other implementations include a through-air dried fabric having a three-dimensional topography disposed thereon that forms the three-dimensional topography of the tissue ply. Various other implementations include a method of forming the tissue ply using the through-air dried fabric.

The invention discloses high-flux filter paper for water filtration and a preparation method thereof. The method comprises the following steps: by taking natural silkworm cocoons as a silk fibroin fiber raw material, preparing silk fibroin fibers through a synergistic effect of solvent dissolution and mechanical stripping; the silk fibroin fibers and the polyester long and short fibers form an interwoven network structure through a physical entanglement and electrostatic assembly technology; the silk fibroin fiber / polyester long fiber / polyester short fiber high-flux water filtering filter paper is prepared from polyester long and short fibers serving as a filtering framework and silk fibroin fibers through a wet papermaking process. The silk fibroin fiber / polyester long fiber / polyester short fiber high-flux water filtration filter paper obtained by the invention has high flux and high toughness through bionic cobweb multistage structural design, effectively filters water pollutants such as fine particulate matters and micro-nano plastic particulate matters, and is suitable for high-precision filtration in severe environments such as a cooling water system and radioactive wastewater treatment.

The utility model relates to a low-energy-consumption hot air balance system for drying toilet paper, which comprises a drying cylinder, a hot air cover, a hot air system and a steam system. The hot air cover is arranged above the drying cylinder in a sleeving manner; the hot air system comprises a heat exchanger, an air heater and an exhaust fan which are sequentially connected through a hot air pipeline, and hot air generated by the hot air system penetrates through the hot air cover and then is exhausted; the steam system comprises a steam pipeline connected with the drying cylinder and a condensed steam buffer tank for storing condensed steam; the top of the condensed steam buffer tank is connected with a steam recovery pipeline, and the bottom is connected with a heat exchanger of the hot air system through a condensed water pipeline. According to the hot air balancing system, heat energy in the papermaking process can be fully utilized, energy consumption needed in the drying process is reduced, and the production cost of enterprises is greatly reduced.

The present application relates to the technical field of pulp drying, and in particular to a pulp drying device, including a rotating drum, a squeezing roller is arranged on one side of the rotating drum, a steering roller is arranged on the other side, the outer side of the rotating drum is covered with a heating cover, and the inner side of the rotating drum is also provided with a heating module that fits the inner wall thereof, and the heating module is a detachable splicing structure; a hot air flow recovery structure is arranged above the heating cover, and the hot air flow recovery structure is connected to the inside of the squeezing roller. In this scheme, a plurality of air pipes are arranged on the heating cover on the outer side of the rotating drum, and the hot air flow is transported by the air pipes and enters the squeezing roller under the action of an air pump, so as to heat the squeezing roller, and the preheated squeezing roller preheats the paper while squeezing out water, thereby realizing the recovery of waste heat and accelerating the subsequent drying process.

The invention discloses high-strength high-air-permeability germinable seed paper and a preparation method thereof, and belongs to the technical field of seed paper preparation. The technical problem that the water absorption and air permeability of traditional seed paper are reduced due to addition of a chemical reinforcing agent, and then the germination rate of seeds is affected is solved. According to the technical scheme, unbleached softwood pulp is used as a raw material, after being pulped by a PFI mill, the unbleached softwood pulp is mixed with cationic lignocellulose nanofibrils and seeds which account for 4-8% of the mass of absolute dry pulp for pulping, forming is conducted through an automatic paper making system of a Kaiser method, and drying and shaping are conducted at the temperature of 40 DEG C; the cationic lignocellulose nanofibrils are prepared by the steps of grinding unbleached softwood pulp, performing alkali treatment, performing etherification reaction and performing ultrahigh-pressure homogenization. The seed paper does not need a chemical reinforcing agent, the air permeability is 17.4-18.8 [mu] m / (Pa.S), the tensile strength is 6.08-6.84 kN / m, and the relative absorptivity is 214-230%.

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.