EP1386998A1 - Pulpeur et procédé pour la récupération des cassés de papier - Google Patents

Pulpeur et procédé pour la récupération des cassés de papier Download PDF

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Publication number
EP1386998A1
EP1386998A1 EP02425495A EP02425495A EP1386998A1 EP 1386998 A1 EP1386998 A1 EP 1386998A1 EP 02425495 A EP02425495 A EP 02425495A EP 02425495 A EP02425495 A EP 02425495A EP 1386998 A1 EP1386998 A1 EP 1386998A1
Authority
EP
European Patent Office
Prior art keywords
container
waste
water
nozzles
pump
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.)
Granted
Application number
EP02425495A
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German (de)
English (en)
Other versions
EP1386998B1 (fr
Inventor
Fabio Perini
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.)
Milltech Srl
Original Assignee
FAPER Srl
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Filing date
Publication date
Application filed by FAPER Srl filed Critical FAPER Srl
Priority to DE60203897T priority Critical patent/DE60203897T2/de
Priority to EP02425495A priority patent/EP1386998B1/fr
Priority to AT02425495T priority patent/ATE294275T1/de
Priority to US10/630,962 priority patent/US20040094276A1/en
Priority to CA002436379A priority patent/CA2436379A1/fr
Publication of EP1386998A1 publication Critical patent/EP1386998A1/fr
Application granted granted Critical
Publication of EP1386998B1 publication Critical patent/EP1386998B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices

Definitions

  • the present invention relates to a device for recovery of paper production waste in paper mills for the continuous production of paper webs, in particular but not exclusively of so-called "tissue" paper. More particularly, the invention relates to a pulper to be combined with a yankee drier in a continuous paper production machine, for the recovery and recycling of processing waste from the drier itself.
  • the invention also relates to a method for recovery and recycling of the production waste.
  • a slurry of cellulose fibers and water is distributed from a head box onto a forming wire or onto a felt for forming a web.
  • the web is conveyed to a section of the production line where it is more or less dried.
  • Various systems may be used for drying.
  • One of the most widespread systems consists of a so-called yankee drier, i.e. a large-diameter cylinder which is heated internally and around which the wet web is conveyed. When in contact with the cylinder, the web dries and is separated from the cylinder by a doctor blade which also performs crêping of the paper.
  • an object of the present invention is to provide a device which avoids the abovementioned drawbacks and is particularly suitable for the recovery of waste, trimmings or other paper scrap, especially that which is produced around the yankee drier.
  • a pulper device for waste paper material characterized in that it comprises: a container for collecting said waste, having an inlet opening for said waste; at least one pressurized water nozzle which produces a jet of water which intercepts the waste which falls into said container; and a first pump which removes the water and the waste from said container.
  • a device thus designed may be arranged below the yankee drier or other equivalent assembly in the paper production line, for collecting the waste, scrap and paper trimmings and recycling them automatically, without the need for storing them and transporting them manually away from the working zone.
  • the jet produced by the water nozzle under pressure destroys at least partially the structure of the waste paper material, separating the fibers from each other as the first stage in the recovery process.
  • the cellulose fibers may then be reintroduced into the production cycle, for example directly or indirectly into the head box which produces the layer of slurry for formation of the paper web.
  • a first series of pressurized water nozzles and a second series of pressurized water nozzles are envisaged.
  • the nozzles are oriented so that the jets produced by the nozzles of the first series and the jets of the nozzles produced by the second series have trajectories which intersect in a zone where the waste or scrap falls.
  • the scrap is struck by jets oriented in the incident directions, said jets exerting an efficient cutting, pulling and/or breaking action on the fiber structure. This facilitates the subsequent reintroduction, into the cycle, of the fibers at least partially individualized, i.e. separated from each other.
  • the nozzles may have trajectories with inclinations which are different from each other.
  • two inclined surfaces for guiding the jets produced by the nozzles may be associated with the first series and the second series of nozzles.
  • the surfaces which are for example flat surfaces, may be varyingly inclined, but are preferably inclined approximately with the same orientation of the axis of the jets produced by the nozzles. Said surfaces terminate in edges which delimit a passage for conveying the water and the refuse paper material toward the bottom of the container.
  • the container has an elongated longitudinal extension such that the inlet opening has an extension approximately equivalent to the axial extension of the yankee drier, for collecting the refuse, waste or other scrap along the whole of the front of the paper web being formed.
  • the first and second series of nozzles extend parallel to the elongated upper opening of the container.
  • the pump is a so-called chopper pump.
  • Chopper pump is generally understood as meaning a pump equipped with parts which are able to cut, break, tear or fragment parts or solid bodies contained in the liquid flow sucked by the pump.
  • These pumps are known per se. They usually consist of centrifugal pumps, the rotor of which is integral with cutting members. Examples of chopper pumps are described in US-A-4,402,648, US-A-4,640,666, US-A-4,519,904, US-A-4,778,336.
  • a recirculation duct is envisaged between the chopper pump, or other equivalent pumping means, and the container.
  • the recirculation duct By means of the recirculation duct, a part of the flow sucked in by the pump is recirculated into said container in a direction such that as to favor suction of the refuse by the pump itself.
  • the outlet of the recirculation duct is situated in a position approximately opposite the inlet mouth of the pump suction duct.
  • the container has an elongated extension
  • the outlet of said recirculation duct and the intake opening of said pump are arranged approximately at the ends of the elongated longitudinal extension of said container.
  • the bottom of the container is inclined from the top downward and from the outlet of the recirculation duct toward the intake opening of the pump.
  • the container is connected to a suction duct which sucks air from the inside of said container. In this way, multiple advantages are obtained.
  • the fibers which are sucked inside the container owing to the vacuum are at least partly intercepted by the pressurized water jets and then automatically introduced into a water flow with the possibility of being recycled together with the fibers of the larger size structures which form the main waste produced by the yankee drier. A combined filtering and fiber-recovery effect is thus obtained.
  • the suction duct has suction openings arranged underneath at least one of said two inclined surfaces.
  • the air flow sucked from inside the container may convey water droplets in suspension form due to the atomization produced by the pressurized water nozzles, Moreover, despite elimination performed by the water jets, dusts or fibers may also be entrained in the air stream.
  • the suction duct may be connected to a separator in order to separate the air from the solid and/or liquid particles entrained in the air flow.
  • a cyclone separator or an equivalent may be used for example.
  • the water flow containing the fiber or residual matter resulting from the collection of scrap or waste paper material, removed from the collection container, has a very low quantity of solid. It is in principle possible to introduce this flow of water and fibers directly into the paper production cycle, for example into the head box. However, this could lead to an excessive water content in the cellulose slurry, i.e. to a cellulose content which is too low.
  • a thickening station is provided to which, at least partly, the mixture of water and waste paper material sucked by means of the pump from the container is conveyed.
  • the solid content of the mixture is increased, eliminating therefrom a part of the water content.
  • the water eliminated is used, however, in the production cycle, for example for supplying the water nozzles.
  • Thickening stations are known per se and used in paper production plants. Examples of thickening stations are described in US-A-5,021,151, US-A-5,186,791, US-A-4,501,040, US-A-4,686,005 and US-A-4,722,793.
  • an object of the present invention is to provide a method for recycling paper scrap, waste or trimmings, in particular formed around the yankee drier.
  • Fig. 1 illustrates schematically the terminal part of the line for the production of a web or strip of paper, in particular tissue paper.
  • 1 denotes the last wire or the last felt for conveying the partially dried layer of slurry formed in a manner known per se.
  • the felt 1 is tangential to a yankee drier 3 so as to transfer the moist web from the external surface of the felt to the external cylindrical surface of the yankee drier 3 which is heated internally.
  • the yankee drier 3 is embraced by the web over a wide contact arc, between the zone of tangential contact with the felt 1 and a doctor or separator blade 5.
  • the web V which is dried owing to the heat exchange with the yankee drier 3, is separated from the cylinder and wound so as to form a reel B intended for further processing.
  • the device 7 is shown in isolation and in greater detail in Figs 2 to 5.
  • Said device comprises a container 9 in the form of a tank or the like, which is elongated in the direction parallel to the axis of the yankee drier 3.
  • the container 9 is provided at the top with an upwardly directed inlet opening 11 for collecting the scrap or waste paper material produced by the yankee drier 3.
  • a first series of nozzles 13 and a second series of nozzles 15 for pressurized water are situated along the longitudinal edges of the opening 11.
  • the two series of nozzles are formed by means of respective pressure ducts, along the axial extension of which the nozzles are distributed.
  • the nozzles are oriented downward and toward the bottom of the container 9, with angles of inclination A and B relative to the horizontal which are different from each other.
  • two walls or surfaces 21, 23 extend, therefore being inclined downward with angles A and B relative to the horizontal.
  • the two surfaces 21, 23 are formed, in the example shown, by two surfaces which extend from the respective series of nozzles 13 or 15 toward the inside of the container, terminating in edges 21A and 23A, respectively.
  • a passage for conveying the water and the refuse paper material toward the bottom of the container 9 is defined between the two edges 21A, 23A.
  • the arrangement is such that the waste or scrap paper material which falls or is sucked inside the container 9 intercepts the two series of pressurized-air jets supplied by the two series of nozzles 13, 15.
  • the highspeed water supplied by the nozzles exerts a pulping action on the intercepted paper material.
  • the incidence, at different angles, of the two series of jets has a cutting effect on the paper material which thus undergoes a first substantial operation involving destruction of the fibrous structure.
  • the paper material and the water supplied by the nozzles of the two series 13, 15 are collected on the bottom 9A of the container 9 which is formed inclined downward from one end to the other of the container 9 in the direction of longitudinal extension thereof, i.e. parallel to the direction of alignment of the nozzles 13, 15 of the two series.
  • an intake duct 25 of a pump 27 is situated in the lowermost zone of the bottom 9A of the container 9.
  • the latter is a so-called chopper pump, i.e. a pump comprising means able to break up and fragment any solid particles which are suspended in the water flow sucked in through the intake duct.
  • the chopper pump 27 is a pump of the centrifugal type. The refuse paper material which is sucked in by the pump 27 is thus further pulverized.
  • a delivery duct 29 which has a branched recirculation duct 29A extends from the chopper pump 27.
  • the branched duct 29A emerges inside the container 9, at a greater height than the inlet mouth of the intake duct 25 and at the opposite end of the container 9.
  • the flow which is produced is oriented parallel to the longitudinal direction of the container 9 and therefore facilitates the outflow of the residual paper material along the bottom 9A of the container 9 which is in any case inclined downward from the outlet of the branched duct 29A toward the inlet mouth of the intake duct 25 of the pump 27.
  • a valve 30 for regulating the recirculation flow is arranged on the branched duct 29A.
  • the main duct 29 extends as far as a second pump 31 which, by means of a delivery duct 33, conveys the flow of water and refuse paper material extracted from the container 9 toward a thickening station generically denoted by 35.
  • a thickening station generically denoted by 35.
  • the substantially purified water which is extracted from the thickening station 35 is discharged by means of a duct 37 into a tank 39 from where it is subsequently recycled.
  • water is for example removed (by means of a pump 40) in order to supply the nozzles of the series of nozzles 13, 15, as well as for other utilities, for example for the said thickening station 35, by means of a pump 42 and a duct 44. From an overflow 46 any excess water is discharged from the tank 39 and conveyed away for further purification.
  • the thickened mixture i.e. with a richer solid content (having a solid content for example of about 4% by weight) is discharged from the thickening station 35 into a second tank 41 and from here recycled by means of conveying to the inflow chamber (not shown) which is supplied with the slurry for production of the web V.
  • a richer solid content having a solid content for example of about 4% by weight
  • the interior of the container 9 is kept under a vacuum by means of a suction duct 51, the inlet 51A of which is located below the inclined surface 23A, between the latter and the external wall of the container 9.
  • a closed volume is defined by means of a further separating baffle 53 which has suction openings 55. Air is sucked from the container 9 toward the suction duct 51 through the openings 55. Any fibrous dusts and/or small droplets of atomized water are also entrained in the air flow.
  • the suction duct 51 leads into a separator 53, which in the example illustrated is shown as a cyclone separator. Here the liquid and/or solid particles suspended in the air flow are separated and recovered, while the air flow is discharged externally. 55 denotes the suction fan which draws the air through the duct 51.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP02425495A 2002-07-31 2002-07-31 Pulpeur et procédé pour la récupération des cassés de papier Expired - Lifetime EP1386998B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE60203897T DE60203897T2 (de) 2002-07-31 2002-07-31 Stofflöser und Verfahren zur Rückgewinnung von produktionsbedingten Papierabfällen
EP02425495A EP1386998B1 (fr) 2002-07-31 2002-07-31 Pulpeur et procédé pour la récupération des cassés de papier
AT02425495T ATE294275T1 (de) 2002-07-31 2002-07-31 Stofflöser und verfahren zur rückgewinnung von produktionsbedingten papierabfällen
US10/630,962 US20040094276A1 (en) 2002-07-31 2003-07-30 Pulper device for the recovery of paper production waste, plant comprising said device and associated method for recovery of the waste
CA002436379A CA2436379A1 (fr) 2002-07-31 2003-07-30 Desintegrateur pour la recuperation de rebuts dans la fabrication de papier, usine comportant ce desintegrateur et methode connexe de recuperation de rebuts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02425495A EP1386998B1 (fr) 2002-07-31 2002-07-31 Pulpeur et procédé pour la récupération des cassés de papier

Publications (2)

Publication Number Publication Date
EP1386998A1 true EP1386998A1 (fr) 2004-02-04
EP1386998B1 EP1386998B1 (fr) 2005-04-27

Family

ID=30011314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425495A Expired - Lifetime EP1386998B1 (fr) 2002-07-31 2002-07-31 Pulpeur et procédé pour la récupération des cassés de papier

Country Status (5)

Country Link
US (1) US20040094276A1 (fr)
EP (1) EP1386998B1 (fr)
AT (1) ATE294275T1 (fr)
CA (1) CA2436379A1 (fr)
DE (1) DE60203897T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2468481A (en) * 2009-03-06 2010-09-15 Vernacare Ltd Macerator using high pressure water jets to macerate
CN111005249A (zh) * 2019-12-24 2020-04-14 廖瑜琳 一种废纸回收再利用生产纸制品的制浆系统

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7203976B1 (en) * 2004-07-16 2007-04-17 Zoeller Company Floor level waste pumping system for toilets
US8562287B2 (en) * 2009-06-23 2013-10-22 Zoeller Pump Company, Llc Grinder pump
EP2474666A1 (fr) 2011-06-21 2012-07-11 Metso Paper Inc. Arrangement pour une machine de production d'une bande de matériau fibreux

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667106A (en) * 1951-09-13 1954-01-26 Black Clawson Co Paper machinery
US3417933A (en) * 1965-07-12 1968-12-24 Black Clawson Co Pulper
US4458845A (en) * 1982-07-16 1984-07-10 Marcalus James A Pulping apparatus
US5582686A (en) * 1991-02-01 1996-12-10 The Black Clawson Company High pressure water jet comminuting
EP0911443A1 (fr) * 1997-10-24 1999-04-28 Praxair Technology, Inc. Procédé pour régler l'alcalinité d'une bouillie de papier dans un pulpeur de cassé
WO2000001884A1 (fr) * 1998-07-03 2000-01-13 Valmet Corporation Materiel et procede destines au passage d'une bande de papier/carton dans un triturateur

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696766A (en) * 1952-08-21 1954-12-14 Black Clawson Co Paper machinery
US3201066A (en) * 1962-11-29 1965-08-17 Bolton John W & Sons Inc Machine and method for disposing of broke
US3973866A (en) * 1975-01-02 1976-08-10 Vaughan Co., Inc. Centrifugal chopping slurry pump
US4448638A (en) * 1980-08-29 1984-05-15 James River-Dixie/Northern, Inc. Paper webs having high bulk and absorbency and process and apparatus for producing the same
KR100218034B1 (ko) * 1990-06-29 1999-09-01 데이비드 엠 모이어 제지 벨트 및 그 제조 방법과, 이 제조 방법에 의해 제조된 흡수성 종이와, 직조 제조 섬유
US5464161A (en) * 1994-09-30 1995-11-07 The United States Of America As Represented By The Secretary Of The Navy Solid waste pulper
US6187139B1 (en) * 1999-07-13 2001-02-13 Fort James Corporation Wet creping process
US6358367B1 (en) * 2000-02-01 2002-03-19 Voith Sulzer Paper Technology North America, Inc. Pulping system for a paper machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667106A (en) * 1951-09-13 1954-01-26 Black Clawson Co Paper machinery
US3417933A (en) * 1965-07-12 1968-12-24 Black Clawson Co Pulper
US4458845A (en) * 1982-07-16 1984-07-10 Marcalus James A Pulping apparatus
US5582686A (en) * 1991-02-01 1996-12-10 The Black Clawson Company High pressure water jet comminuting
EP0911443A1 (fr) * 1997-10-24 1999-04-28 Praxair Technology, Inc. Procédé pour régler l'alcalinité d'une bouillie de papier dans un pulpeur de cassé
WO2000001884A1 (fr) * 1998-07-03 2000-01-13 Valmet Corporation Materiel et procede destines au passage d'une bande de papier/carton dans un triturateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2468481A (en) * 2009-03-06 2010-09-15 Vernacare Ltd Macerator using high pressure water jets to macerate
CN111005249A (zh) * 2019-12-24 2020-04-14 廖瑜琳 一种废纸回收再利用生产纸制品的制浆系统

Also Published As

Publication number Publication date
CA2436379A1 (fr) 2004-01-31
DE60203897D1 (de) 2005-06-02
US20040094276A1 (en) 2004-05-20
DE60203897T2 (de) 2006-01-19
ATE294275T1 (de) 2005-05-15
EP1386998B1 (fr) 2005-04-27

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