EP0122991A2 - Dispositif et procédé de desintégration de matières cellulosiques à haute densité - Google Patents

Dispositif et procédé de desintégration de matières cellulosiques à haute densité Download PDF

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Publication number
EP0122991A2
EP0122991A2 EP83304496A EP83304496A EP0122991A2 EP 0122991 A2 EP0122991 A2 EP 0122991A2 EP 83304496 A EP83304496 A EP 83304496A EP 83304496 A EP83304496 A EP 83304496A EP 0122991 A2 EP0122991 A2 EP 0122991A2
Authority
EP
European Patent Office
Prior art keywords
rotor
stock
tub
pulping
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83304496A
Other languages
German (de)
English (en)
Other versions
EP0122991A3 (fr
Inventor
Earl T. Blakley
Paul G. Marsh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black Clawson Co
Original Assignee
Black Clawson Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Black Clawson Co filed Critical Black Clawson Co
Publication of EP0122991A2 publication Critical patent/EP0122991A2/fr
Publication of EP0122991A3 publication Critical patent/EP0122991A3/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers

Definitions

  • This invention relates to apparatus and methods for pulping paper making stock at relatively high consistencies, namely with a solids content substantially in excess of 10 percent, e.g. 12 to 25 percent, as compared with conventional pulping consistencies which are commonly in the range of 4 to 6 percent solids.
  • the assignee of the present invention has been a pioneer in the development of pulpers for paper making stock characterized by comprising an upright cylindrical tub provided with a rotor of special construction mounted in the bottom thereof for rotation on a vertical axis coincident with the axis of the tub wall.
  • a rotor of special construction mounted in the bottom thereof for rotation on a vertical axis coincident with the axis of the tub wall.
  • One of the early designs of such pulpers of its manufacture is shown in the U.S. patent to Martindale No. 2,371,837 of 1945, and a more recent design is U.S. patent to Vokes No. 3,073,535 of 1963.
  • the trademark "Hydrapulper" which it has used for this equipment since 1939 is so widely recognized that it has at times been in danger of conversion into a generic term for this type of apparatus.
  • the primary object of the present invention has been to develop and provide a pulper having the same-basic design and operating characteristics as its predecessors in the line of "Hydrapulper" equipment but which would be specially adapted for effective and efficient pulping of paper making stock in a range of high consistencies, i.e. a range of approximately 10 to 25 percent solids.
  • the successful accomplishment of this objective was found to depend upon a number of structural and operational features which appear not to have been recognized in the prior art of high consistency pulping.
  • the rotor should apply such radially outward force to the stock that the stock would not only travel to the wall of the tub.but also climb the interior of this wall to a substantial extent, as it is quite capable of doing when of the high consistencies under consideration. It was also determined that accomplishment of this result required that the force applied to the stock should be firm but relatively gentle, i.e. a pushing force rather than a series of blows.
  • each vane have a working face of substantial area, provided by the combination of substantial height as well as substantial extent circumferentially of the rotor body. This in turn required both that there be a relatively small number of vanes, and also that the curvature of the working faces of the vane be about a radius or radii of substantial length such that the radial distance from the trailing edge of the working face to the axis of the rotor is not very much greater than the radial space from the leading end of the working face to the rotor axis.
  • the rotor of the above Vokes patent has eight vanes provided with correspondingly short working faces whose leading ends are located relatively close to the rotor axis, optimum results have been obtained in the practice of the present invention with a rotor comprising only three vanes, so that the working face of each vane extends nearly 120° around the rotor body. Also, these working faces are relatively gently curved inwardly from the periphery of the rotor, to provide a sustained pushing action on the stock.
  • the rotor should be substantially larger than in similar pulpers operating under standard conditions of relatively low consistency stock.
  • successful results have been consistently obtained in the past with a pulper comprising a cylindrical tub 8 ft. in diameter and a rotor of the construction shown in the above-noted Vokes patent which was 24 in. in diameter.
  • an 8 ft. pulper in accordance with the present invention for pulping high consistency stock will operate most effectively with a rector 44 in. in diameter.
  • This relationship also holds true for larger sized pulper tubs, the general rule being that the ratio of tub diameter to rotor diameter should be of the order of slightly more than 2:1, e.g. a 54 in. rotor in a tub 10 ft. in diameter.
  • the pulper illustrated in Figs. 1-2 includes a tub having a cylindrical upper wall 10, and a bottom wall comprising a plane center section 11 surrounded by an imperforate frusto-conical portion 12, which includes a dump valve 13 operated by a fluid pressure cylinder 15.
  • the tub is mounted on supports 16 of any suitable character, and arranged below the tub is a gear drive 17 shown as directly driven by a motor 18.
  • the rotor 20 includes a circular plate 22 which forms the rotor body and is of a large diameter with relation to that of the tub, for example, a diameter of 44 inches where the diameter of the tub wall 10 is 8 feet.
  • the rotor 20 includes three vanes 25 on the upper surface of the rotor body 22 which are of special configuration illustrated in Figs. 1-4.
  • the working face 30 of each vane extends vertically from the surface of the rotor body 22, and as viewed from the side as shown in Fig. 1, the upper edge of each working face 30 comprises a straight portion 31 parallel with the bottom of the rotor body, and a portion 32 which is inclined downwardly from the portion 31 to a minimum height at the leading end of the vane, which is effectively zero at the point where the vane merges with the top of the rotor body 22.
  • each vane 25 has a half-crescent shape as viewed in plan, and is inclined downwardly from its maximum height along the edge 31-32 to a minimum height of effectively zero at the leading end 34 of the vane where it also merges into the top of the rotor body 22.
  • the angle defined by radii from the center of the rotor 25 to the opposite ends of each vane define an angle of substantially 120°, but the trailing end 35 of each vane is cut back, at an angle of approximately 40° to the radius to its radially inner end, and this surface 35 extends substantially vertically with respect to the-rotor body 22.
  • the use of only three vanes on the rotor as shown correspondingly increases the effective length of the working face of each vane.
  • the force applied to the stock by each vane is a relatively gentle pushing force with a substantial radially outwardly directed component, rather than a predominantly tangential component as with the rotor of the above-noted Vokes patent.
  • the rotor of the invention therefore effects the defibering of high consistency pulp by inducing strong frictional interaction in the pulp rather than by mechanical or hydraulic action.
  • the maximum height of the working face 30 of each vane was 6 inches, and the straight section 31 of its upper edge was 5 inches in length.
  • the maximum radial distance from the working face 30 to the center of the rotor was 16.5 inches, while the corresponding minimum distance was approximately 9 inches.
  • the radial spacing from the leading end of each blade to the trailing end of the adjacent blade was 1.5 inches.
  • a feed screw indicated generally at 40 is mounted in the center of the rotor body 22 and comprises a cylindrical central body 41, flight means 42, and a rounded upper end cap 44 to prevent solid material from hanging up on top of the second body 41.
  • Preferred results have been obtained on a 33-inch rotor with double flights 42 having a 6-inch pitch and an outer diameter of 8.75 inches on a central body 41 6.625 inches in diameter and substantially equal in height to the diameter of the rotor, and with the lower ends of the screw flights 42 spaced a substantial distance above the bottom of the rotor body 22, e.g. 6 inches.
  • the invention is not limited to a feed screw having a specific number of flights, as illustrated by the single flight arrangement in Fig. 3.
  • the outer radius of the screw flights 42 is substantially less than the minimum radial distance from the center of the rotor to the vanes 25, so that there is a substantial space between the screw flights and the rotor body as well as the upper surfaces of the vanes 25, as best seen in Fig. 2. It appears that this arrangement may contribute materially to the desired development of high frictional forces in the stock. More specifically, since the peripheral speed of the screw flights 42 is less than that of even the leading ends of the vanes 25, the stock delivered to the central portion of the rotor body at relatively low speed will be forced to accelerate suddenly when it is picked up by the, leading ends of the vanes and thus literally torn away progressively from the remaining stock below the feed screw.
  • the effect of the rotor of the invention in pulping high consistency stock is to cause the stock to tend to travel up the cylindrical tub wall 10, an action which is-aided by the frusto-conical bottom portion 12.
  • Special provision is made in accordance with the invention to subdivide such climbing stock and direct it back toward the center of the tub where the feed screw 40 will force it down onto the surface of the rotor 20 for repeated action by the rotor vanes.
  • the primary such subdividing and directing means are three baffles 50, which are equispaced circumferentially of the tub wall, and which are of such generally pyramid shape and proportions that each baffle spans an angle of 60° of the cylindrical tub wall 10.
  • Each baffle 50 has four sides which have a common dimension in a horizontal plane so that they define a point 51, but the two lower sides 52 are substantially longer than the two upper sides 53. More specifically, each of the lower sides 52 is generally trapezoidal except to the extent that its outer and lower edges are formed to match the curvature of the tub wall 10, with the smaller end located at approximately the level at which the frusto-conical bottom wall 12 meets the cylindrical wall 10.
  • each of the baffles 50 having an overall height of 56 inches, with the common dimension of its four sides being 24.375 inches, with the point 51 where its four sides meet being spaced inwardly 10.75 inches from the inner surface of the cylindrical wall 10, and with the point 51 located slightly above the highest level to which the tub is normally filled with stock e.g. 44 inches above the bottom of the cylindrical wall 10.
  • the bottom end of each side 52 was 10 inches wide, but in a smaller pulper, this dimension may reduce to the point where each side 52 is triangular rather than trapezoidal.
  • each of the baffles 50 With this construction and arrangement of each of the baffles 50, the lower and longer sides 52 are upwardly inclined inwardly of the tub with respect to the cylindrical wall 10, and they are also inclined in opposite directions inwardly with respect to the wall 10 in a horizontal plane so that regardless of the direction of rotation of the rotor 20, one of these sides will be positioned to intercept stock travelling around the wall 10 in the direction of rotation of the rotor.
  • the rotor 20 constructed to rotate counterclockwise as viewed in Fig. 2
  • stock tending to travel around the wall 10 under the impelling force of the rotor will encounter the clockwise-facing portion 52 of each of the baffles 50, which will tend to redirect that stock both toward the center of the tub and also downwardly, with this redirecting force increasing as the stock climbs higher.
  • the major component of movement of the stock along the tub wall is vertical, rather than circumferential, as a climbing wall of relatively ⁇ self-supporting pulp, and the peak 54 along which the baffle surfaces 52 are joined, and especially the point 51 where they join the portions 53, tend to cut or otherwise to subdivide the climbing wall of pulp into strips which are more easily redirected back into the tub.
  • all such climbing stock will be redirected back into the tub before it reaches the upper sides 52 of any of the baffles 50, but if any stock should climb that high, it will tend to slide by gravity back into the tub along the smooth surfaces of the baffle sides 53, which are inclined downwardly at angles in the range of 40° to 50°.
  • baffles 50 which will effectively cover one-half of the cylindrical wall 10, but it has also been found desirable to provide an additional baffle 55 in each of the spaces between adjacent baffles 50.
  • Each of the baffles 55 has four generally triangular sides 56 of the same dimensions to provide a generally diamond shape with a point 57.
  • baffles 55 supplement the action of the baffles 50 in subdividing any pulp which climbs that high along the wall 10 between the baffles 50, and redirecting the resulting strips back into the tub.
  • good results were obtained with baffles 55 17.625 inches along each edge which projected 10.75 inches into the tub with their points 57 approximately 6 inches higher than the points 51 of the baffles 50.
  • High consistency pulping is by necessity a batch operation, since the stock is too dry for continuous pulping such as is commonly done with stock in the range of 6 percent consistency or less. Therefore, with the pulper shown in Figs. 1 and 2, when a given batch has been sufficiently defibered, the dump valve 13 is opened, and discharge of the contents of the tub is effected therethrough with the aid of added water while the rotor is operating. It is also practical, however, to provide the tub with a perforated extraction plate below the rotor, namely with the plane bottom wall 11 in Fig. 1 perforated and communicating with a collection chamber therebelow from which stock is piped away, as shown in the above Vokes patent.
  • Fig. 5 shows a rotor in accordance with the invention particularly designed for use with such a perforated bed plate.
  • This rotor 70 is in most respects identical with the rotor shown in Figs. 1-4, and the parts thereof have accordingly been similarly designated with reference characters 25', 30' and so forth.
  • the primary distinction between the two rotors is that where the rotor body 22 in Figs. 3-6 is circular, and thereby provides web portions in the spaces between the trailing and leading faces of the vanes 25, there are no such web portions in the rotor 70 so that when this rotor is used in a tub provided with a perforated bed plate 11', the surface portions of the bed plate between the vanes of the rotor will be exposed, as shown in Fig. 5.
  • the primary advantage of a pulper of the invention provided with a perforated bed plate and the rotor of Fig. 5 is that after completion of a batch pulping operation, the stock is extracted through the bed plate by adding dilution water at the center of the tub while the rotor is in operation, and the bed plate acts as a strainer to retain contaminant materials too large to pass through the holes in the bed plate. Otherwise, the operation of a pulper of the invention provided with a rotor and bed plate as shown in Fig. 5 is essentially the same as already described in connection with Figs. 1-4.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP83304496A 1982-08-12 1983-08-03 Dispositif et procédé de desintégration de matières cellulosiques à haute densité Withdrawn EP0122991A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40737182A 1982-08-12 1982-08-12
US407371 1982-08-12

Publications (2)

Publication Number Publication Date
EP0122991A2 true EP0122991A2 (fr) 1984-10-31
EP0122991A3 EP0122991A3 (fr) 1985-02-06

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ID=23611763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304496A Withdrawn EP0122991A3 (fr) 1982-08-12 1983-08-03 Dispositif et procédé de desintégration de matières cellulosiques à haute densité

Country Status (5)

Country Link
EP (1) EP0122991A3 (fr)
JP (1) JPS5947494A (fr)
BR (1) BR8304336A (fr)
ES (1) ES524867A0 (fr)
FI (1) FI832887A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2630139A1 (fr) * 1988-04-18 1989-10-20 Lamort E & M Pulpeur de pate a papier
EP1347093A1 (fr) * 2002-03-19 2003-09-24 Comer SpA Hélice de brassage de suspensions solides-liquides dans un réservoir de traitement
FR2908058A1 (fr) * 2006-11-02 2008-05-09 Kadant Lamort Soc Par Actions Turbines a plaques
WO2009089878A1 (fr) * 2008-01-17 2009-07-23 Voith Patent Gmbh Désintégrateur destiné à broyer et à mettre en suspension de la pâte à papier
CN104372706A (zh) * 2013-08-12 2015-02-25 苏州维艾普新材料股份有限公司 一种内含导料螺旋的玻璃棉打浆装置
CN104372702A (zh) * 2014-12-15 2015-02-25 济南大学 一种低功耗低噪声的碎浆机
CN108252146A (zh) * 2018-03-23 2018-07-06 郑州华美彩印纸品有限公司 一种用于造纸生产的打浆机
CN109208363A (zh) * 2018-11-20 2019-01-15 重庆工程职业技术学院 一种节能环保的造纸印刷用碎浆设备
CN111794010A (zh) * 2020-07-16 2020-10-20 山东泗水金立得纸业有限公司 无碳复写纸生产用纸浆制备装置
CN113458123A (zh) * 2021-07-26 2021-10-01 中国环境保护集团有限公司 厨余垃圾预处理系统及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371837A (en) * 1941-04-29 1945-03-20 Black Clawson Co Apparatus for pulping and screening papermaking materials
US2641971A (en) * 1949-02-07 1953-06-16 Downingtown Mfg Co Paper stock pulper
US3073535A (en) * 1960-03-24 1963-01-15 Black Clawson Co Paper machinery
DE1461017A1 (de) * 1963-11-28 1969-01-23 E D Jones Corp Zerkleinerungsgeraet
DE2542065A1 (de) * 1975-09-20 1977-03-24 Bolton Emerson Verfahren zum zerfasern und verfeinern der fasern insbesondere schwer auffaserbarer materialien sowie zerfaserer zur durchfuehrung des verfahrens

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5014802A (fr) * 1973-06-18 1975-02-17

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371837A (en) * 1941-04-29 1945-03-20 Black Clawson Co Apparatus for pulping and screening papermaking materials
US2641971A (en) * 1949-02-07 1953-06-16 Downingtown Mfg Co Paper stock pulper
US3073535A (en) * 1960-03-24 1963-01-15 Black Clawson Co Paper machinery
DE1461017A1 (de) * 1963-11-28 1969-01-23 E D Jones Corp Zerkleinerungsgeraet
DE2542065A1 (de) * 1975-09-20 1977-03-24 Bolton Emerson Verfahren zum zerfasern und verfeinern der fasern insbesondere schwer auffaserbarer materialien sowie zerfaserer zur durchfuehrung des verfahrens

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2630139A1 (fr) * 1988-04-18 1989-10-20 Lamort E & M Pulpeur de pate a papier
EP0343023A1 (fr) * 1988-04-18 1989-11-23 E & M LAMORT Pulpeur de pâte à papier
US4938423A (en) * 1988-04-18 1990-07-03 E & M Lamort Paper pulp beater
EP1347093A1 (fr) * 2002-03-19 2003-09-24 Comer SpA Hélice de brassage de suspensions solides-liquides dans un réservoir de traitement
FR2908058A1 (fr) * 2006-11-02 2008-05-09 Kadant Lamort Soc Par Actions Turbines a plaques
CN101910508B (zh) * 2008-01-17 2013-04-17 沃依特专利有限责任公司 使纸料粉碎和悬浮的碎浆机
WO2009089878A1 (fr) * 2008-01-17 2009-07-23 Voith Patent Gmbh Désintégrateur destiné à broyer et à mettre en suspension de la pâte à papier
CN104372706A (zh) * 2013-08-12 2015-02-25 苏州维艾普新材料股份有限公司 一种内含导料螺旋的玻璃棉打浆装置
CN104372702A (zh) * 2014-12-15 2015-02-25 济南大学 一种低功耗低噪声的碎浆机
CN108252146A (zh) * 2018-03-23 2018-07-06 郑州华美彩印纸品有限公司 一种用于造纸生产的打浆机
CN108252146B (zh) * 2018-03-23 2023-11-24 郑州华美彩印纸品有限公司 一种用于造纸生产的打浆机
CN109208363A (zh) * 2018-11-20 2019-01-15 重庆工程职业技术学院 一种节能环保的造纸印刷用碎浆设备
CN111794010A (zh) * 2020-07-16 2020-10-20 山东泗水金立得纸业有限公司 无碳复写纸生产用纸浆制备装置
CN113458123A (zh) * 2021-07-26 2021-10-01 中国环境保护集团有限公司 厨余垃圾预处理系统及方法
CN113458123B (zh) * 2021-07-26 2024-05-28 中国环境保护集团有限公司 厨余垃圾预处理系统及方法

Also Published As

Publication number Publication date
FI832887A (fi) 1984-02-13
FI832887A0 (fi) 1983-08-11
JPS5947494A (ja) 1984-03-17
EP0122991A3 (fr) 1985-02-06
ES8406602A1 (es) 1984-07-01
ES524867A0 (es) 1984-07-01
BR8304336A (pt) 1984-03-20

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