Patents Assigned to Valmet AB
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Publication number: 20150345077Abstract: Screening apparatus for screening pulp suspensions are provided. The screening apparatus includes a casing, a cylindrical screen member is arranged on the casing for dividing the pulp into accept and reject portions, an inlet for the pulp, an outlet for the accept, an outlet for the reject, a rotor with a rotor body, and at least one pulsator located on the inside of the screen, so that a screening chamber is formed between the rotor and the screen. The rotor is provided with a detachable pulsator package including at least one attachment ring attached to the rotor body, at least one support ring attached to or supported by the rotor body and the at least one pulsator attached to the at least one attachment ring and the at least one support ring.Type: ApplicationFiled: November 27, 2013Publication date: December 3, 2015Applicant: VALMET ABInventors: Anders Bergdahl, David Lindkvist
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Patent number: 9187863Abstract: The method is for preparation of white liquor in a chemical recovery process of the kraft process. The green liquor separation process and the white liquor separation process are taking place in the same common filter apparatus with no dedicated green liquor separation apparatus or any dedicated white liquor separation apparatus. The white liquor separation process and the green liquor separation process are conducted in sequence in the same filter apparatus. The white liquor separation process has a part of the cycle time in the range 20-50% of the total cycle time in the same filter apparatus.Type: GrantFiled: November 4, 2011Date of Patent: November 17, 2015Assignee: Valmet ABInventors: Eva Hogebrandt, Alessandra Labigalini Baranovsky
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Patent number: 9181655Abstract: The invention relates to an extended nip roll (5) capable of forming a press nip (N) with a counter roll (7) which press nip (N) has an extension in a machine direction when the extended nip roll (5) cooperates with the counter roll (7). The extended nip roll (5) comprises a flexible jacket; an elastic press body (13) arranged inside the flexible jacket. The top side (14) of the press body (13) is beveled in such a way that, in the machine direction, a working surface (15) of the top side has a downstream end (16) which, in the machine direction, is followed by an exit side surface (17) that diverges from the interior surface (11) of the flexible jacket (10). The press body (13) further has at least a first and a second internal pressure chamber (18, 19). The pressure chambers (18, 19) can be pressurized such that the press body (13) expands.Type: GrantFiled: March 12, 2013Date of Patent: November 10, 2015Assignee: Valmet ABInventors: Tord Gustavsson, Goeran Ekstroem, Jan Paulsson, Karl-Johan Tolfsson
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Patent number: 9175438Abstract: The method is for separation of lignin from original black liquor (BLIN) and has the following phases in sequence. A first precipitation phase (PR1) for precipitation of lignin by a first acidification of the original black liquor by adding a first acid or mixture of acids (G1a) followed by a first storage phase wherein precipitated lignin particles are allowed to increase in size, followed by a second precipitation phase (PR2) for precipitation of lignin by a further acidification of the original black liquor by adding a second acid or mixture of acids (G1b). By retaining the acidified black liquor for at least 25 minutes in the storage phase are the precipitated lignin particles allowed to grow in size and the filterability is improved considerably.Type: GrantFiled: November 11, 2011Date of Patent: November 3, 2015Assignee: Valmet ABInventors: Martin Wimby, Mattias Svensson, Henrik Wallmo, Fredrik Öhman, Per Tomani, Lars-Erik Åkerlund
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Patent number: 9156221Abstract: A feeding arrangement for feeding plant material to a treatment vessel is disclosed including a plug screw feeder, a force feeding screw for feeding the plant material to the plug screw feeder in which the force feeding screw is arranged essentially perpendicular to the plug screw, and a feeding device for feeding incoming material to the force feeding screw, and in which the plug screw can rotate at variable speed, and the force feeding screw includes when a distance between the last screw thread of the force feeding screw and the outer diameter of the plug screw is up to 90 mm.Type: GrantFiled: February 19, 2013Date of Patent: October 13, 2015Assignee: Valmet ABInventors: Jan Detlefsen, Patrik Pettersson, Robert Wahlberg
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Patent number: 9057157Abstract: The invention relates to an arrangement arranged to introduce a three-dimensional structure in a paper during production of said paper in a paper making machine (1). The arrangement comprises a heat roll (14) arranged to dry a wet paper web and an extended nip roll (12) arranged to form a transfer nip (TN) with said heat roll (14). The extended nip roll (12) is provided with a flexible jacket (17) arranged around the circumferential area of said extended nip roll (12). An external surface of said flexible jacket (17) is provided with a textured portion (15) and when the wet paper web passes the transfer nip between said extended nip roll (12) and said heat roll (14), said textured portion (15) of the external surface of the flexible jacket (17) will impart a three-dimensional texture to the paper web.Type: GrantFiled: November 8, 2014Date of Patent: June 16, 2015Assignee: Valmet ABInventor: Tord Gustavsson
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Patent number: 8980061Abstract: The improved profile bar screen is for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel. The profile bar screen is designed with horizontal support arches that have expansion slots allowing the otherwise rigid structure of the support arches to flex and adapt to any unevenness of the vessel wall, thus allowing support shoulders to rest against the inside of the vessel wall.Type: GrantFiled: January 12, 2012Date of Patent: March 17, 2015Assignee: Valmet ABInventors: Mikael Vinje, Jerk Söderman
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Patent number: 8959790Abstract: A device for positioning a drain pipe (6) of a draining system in a drying cylinder (1), the jacket (2) of which has inner circumferential grooves (3) for condensate which is formed as a result of heat transfer, said draining system comprising an outlet means and a plurality of drain pipes which are connected to the outlet means, wherein the draining system removes the condensate from the grooves via the drain pipes and the outlet means, wherein the device has a pipe positioner (14) which is disposed in an end portion (12) of the drain pipe located closest to the outlet means, said pipe positioner comprising a mounting device (15) for mounting the drain pipe onto the outlet means, and a lockable connection (16) that connects the drain pipe to the mounting device (15). According to the invention, the lockable connection is a joint connection, which defines a fulcrum for pivoting of the drainpipe in a plane to enable positioning of the drain pipe relative to the bottom surface of the groove.Type: GrantFiled: September 1, 2011Date of Patent: February 24, 2015Assignee: Valmet ABInventor: Johnny Anerud
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Publication number: 20150020700Abstract: A feeding arrangement (100) for feeding non-wood plant material having a bulk density of 40-90 kg/m3 to a treatment vessel (200), the feeding arrangement comprising a plug screw feeder (40) for feeding the plant material to the treatment vessel, the feeder comprising a plug screw (10) and a corresponding plug screw housing (11) surrounding the plug screw (10), a force-feeding screw (20) for feeding incoming material to the plug screw and a corresponding force-feeding screw housing (21) surrounding the force-feeding screw (20), the force-feeding screw being arranged to provide the material to an inlet section (12) of the plug screw (10), a feeding device (50) being arranged to feed incoming material to the force-feeding screw, and where the distance (D) between an outermost point of a last screw thread (23) of the force-feeding screw (20) to a point on the outer diameter of the plug screw (10) at the inlet section (12) is 0-90 mm.Type: ApplicationFiled: February 19, 2013Publication date: January 22, 2015Applicant: VALMET ABInventors: Jan Detlefsen, Patrik Pettersson, Robert Wahlberg
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Publication number: 20140369156Abstract: A mixing unit (10) for use in a mixing apparatus (100) for mixing chemicals in liquid or gaseous state into a fiber suspension, which apparatus comprises a housing (101) defining a mixing chamber (102), a first inlet (103) for feeding a pulp suspension to the mixing chamber, a second inlet (104) for feeding treatment media into the mixing chamber, a drive shaft (105) connected to a drive device (106) for rotation of the drive shaft in operation, and an outlet (107) for discharging the mixture of pulp suspension and treatment media, said unit (10) for mixing being adapted to be installed in the mixing apparatus and comprising a rotor (11) comprising a rotor shaft (11a) being arranged to be connected to the drive shaft (105) for, in operation, simultaneous rotation with the drive shaft, at least two rotor bodies (11b, 11c) arranged on the rotor shaft (11a), each having a radial extension, the bodies being arranged to be axially separated from each other along the rotor shaft (11a) and adapted to cooperate so asType: ApplicationFiled: December 6, 2012Publication date: December 18, 2014Applicant: VALMET ABInventors: Fredrik Holmstrand, Tomas Vikström, Jörgen Lundberg
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Patent number: 8911594Abstract: The invention relates to an arrangement arranged to introduce a three-dimensional structure in a paper during production of said paper in a paper making machine (1). The arrangement comprises a heat roll (14) arranged to dry a wet paper web and an extended nip roll (12) arranged to form a transfer nip (TN) with said heat roll (14). The extended nip roll (12) is provided with a flexible jacket (17) arranged around the circumferential area of said extended nip roll (12). An external surface of said flexible jacket (17) is provided with a textured portion (15) and when the wet paper web passes the transfer nip between said extended nip roll (12) and said heat roll (14), said textured portion (15) of the external surface of the flexible jacket (17) will impart a three-dimensional texture to the paper web.Type: GrantFiled: December 4, 2012Date of Patent: December 16, 2014Assignee: Valmet ABInventor: Tord Gustavsson
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Patent number: 8888954Abstract: The feed system is for a continuous digester where at least two pumps are arranged in parallel at the bottom of a pre-treatment vessel and a stirrer is provided in direct connection to inlets to pumps. The system makes it possible to provide a feed system with an improved accessibility and operational reliability, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced.Type: GrantFiled: February 13, 2014Date of Patent: November 18, 2014Assignee: Valmet ABInventors: Anders Samuelsson, Jonas Saetherasen, Daniel Trolin
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Patent number: 8888959Abstract: The feed system is for a continuous digester where at least two pumps are arranged in parallel in the bottom of a pre-treatment vessel and a liquid level of at least 20 meters is established. The system makes it possible to provide a feed system with an improved accessibility and more reliable operation, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced.Type: GrantFiled: December 3, 2013Date of Patent: November 18, 2014Assignee: Valmet ABInventors: Anders Samuelsson, Jonas Saetherasen, Daniel Trolin
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Patent number: 8871060Abstract: The invention relates to a method of producing a structured fibrous web of paper. The method comprises forming a fibrous web and conveying the formed fibrous web on a water receiving felt (5) to a dewatering nip. An endless belt (11) with a polyurethane surface is passed through the nip together with the fibrous web and the water receiving felt (5). After the dewatering nip, the fibrous web is conveyed by the endless belt (11) to an endless textured fabric (12) which is permeable to air and to which the web is transferred from the endless belt (11) in a transfer nip. The textured fabric (12) rans at a lower speed than the endless belt (11). After the transfer to the textured fabric (12), the fibrous web is carried by the textured fabric (12) to a drying cylinder (17). The transfer nip is formed by two rolls of which one is a suction roll within the loop of the textured fabric. The transfer nip has a length which is 5 mm-40 mm.Type: GrantFiled: July 9, 2012Date of Patent: October 28, 2014Assignee: Valmet ABInventor: Ingvar Klerelid
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Patent number: 8852395Abstract: The method and arrangement are for adding treatment liquid to comminuted cellulose material, preferably wood chips, during the manufacture of chemical pulp in a continuous process. The process is using a down-flow vessel wherein chips are descending down the vessel in a plug flow and wherein treated chips are continuously fed out at the bottom of the vessel. By arranging at least one telescopic pipe inside the vessel that extends down into the plug flow makes it possible to adjust the position for the addition of treatment liquid depending on current operational parameters.Type: GrantFiled: March 25, 2011Date of Patent: October 7, 2014Assignee: Valmet ABInventors: Daniel Trolin, Fredrik Wilgotson
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Publication number: 20140284012Abstract: The invention relates to an arrangement arranged to introduce a three-dimensional structure in a paper during production of said paper in a paper making machine (1). The arrangement comprises a heat roll (14) arranged to dry a wet paper web and an extended nip roll (12) arranged to form a transfer nip (TN) with said heat roll (14). The extended nip roll (12) is provided with a flexible jacket (17) arranged around the circumferential area of said extended nip roll (12). An external surface of said flexible jacket (17) is provided with a textured portion (15) and when the wet paper web passes the transfer nip between said extended nip roll (12) and said heat roll (14), said textured portion (15) of the external surface of the flexible jacket (17) will impart a three-dimensional texture to the paper web.Type: ApplicationFiled: December 4, 2012Publication date: September 25, 2014Applicant: VALMET ABInventor: Tord Gustavsson
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Patent number: 8801898Abstract: The method and arrangement is for adding treatment liquor to comminuted cellulose material, preferably wood chips, during the manufacture of chemical pulp in a continuous process. The process uses a down-flow vessel where chips are descending down the vessel in a plug-flow and where treated chips are continuously fed out at the bottom of the vessel. By arranging more than two parallel pipes offset from the center of the vessel a better distribution of treatment liquor is obtained. Any disturbance of the chip plug flow descending down the vessel is reduced to a minimum.Type: GrantFiled: August 19, 2009Date of Patent: August 12, 2014Assignee: Valmet ABInventors: Daniel Trolin, Fredrik Wilgotson, Peter Henricsson
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Patent number: 8795468Abstract: The withdrawal screen section is for impregnation of chips during the manufacture of chemical pulp. Chips are steamed and impregnated in a low pressure impregnation vessel using pressurized hot spent cooking liquor BL. The spent cooking liquor produces most of the steam BLST necessary for steaming the chips. To reduce the need for adding fresh steam for chip steaming is a first withdrawal section in the impregnation vessel modified to be used both as a flash tank for warm pressurized wash filtrate and improved wash-out feature for the spent impregnation liquid behind the screen in the withdrawal section. The withdrawal volume is arranged with an upper part located above the liquid level LIQLEV of the impregnation vessel. Additional pressurized warm wash liquor REC1 is added to the withdrawal volume and flashed off steam is led in a steam duct to the chip volume above the liquid level.Type: GrantFiled: July 9, 2010Date of Patent: August 5, 2014Assignee: Valmet ABInventors: Jonas Saetherasen, Kent-Olof Karlsson
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Patent number: 8784538Abstract: The invention relates to a unit (3) for deaeration of drainage water from a paper machine, said unit comprising an inlet (8) for receiving the drainage water in a first flow direction, an outlet (39) for removing the drainage water to a subsequent deaeration channel, and a first chamber (5) that is arranged downstream of the inlet, said first chamber comprising a first chamber part (18), which comprises a guide wall portion (37) for redirecting the drainage water in a second flow direction that differs from the first flow direction, said guide wall portion being formed by a plurality of curved guide walls (10, 23) which interact with the drainage water so that the drainage water is decelerated and air is forced out of the drainage water, and two end walls (25, 26) which are arranged on respective sides of the guide walls, wherein each end wall of at least one of the flow channels exhibits an opening (27) that communicates with the flow channel for removing air that has been released from the drainage water inType: GrantFiled: December 8, 2010Date of Patent: July 22, 2014Assignee: Valmet ABInventors: Jan Malm, Rune Skogsberg, Leif Videgren, Christian Ako
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Patent number: 8758571Abstract: A method and apparatus for processing pulp is disclosed including opposed endless wires conveyed in the same direction and defining a web-forming space therebetween for dewatering the web, a pair of perforated dewatering tables supporting the endless wires for pressing the wires towards the web, the first perforated dewatering table ending upstream of the second perforated dewatering table, and a press roll downstream of the back end of the first perforated dewatering table and opposed to the back end of the second perforated dewatering table to form a nip between the press roll and the back end of the second perforated dewatering table, which has a profiled surface that interacts with the press roll to prolong the nip between the press roll and the back end of the second perforated dewatering table.Type: GrantFiled: December 15, 2011Date of Patent: June 24, 2014Assignee: Valmet ABInventors: Hans Lövgren, Leif Öd-mark