EP1895047A1 - Procédé et appareil pour unité de dépulpage - Google Patents

Procédé et appareil pour unité de dépulpage Download PDF

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Publication number
EP1895047A1
EP1895047A1 EP07015572A EP07015572A EP1895047A1 EP 1895047 A1 EP1895047 A1 EP 1895047A1 EP 07015572 A EP07015572 A EP 07015572A EP 07015572 A EP07015572 A EP 07015572A EP 1895047 A1 EP1895047 A1 EP 1895047A1
Authority
EP
European Patent Office
Prior art keywords
teeth
rotor
wings
pulper
container
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Withdrawn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
EP07015572A
Other languages
German (de)
English (en)
Inventor
Robert J. Matz
Michael Piper
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1895047A1 publication Critical patent/EP1895047A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • D21B1/347—Rotor assemblies

Definitions

  • the present invention relates to an apparatus and methods for shredding and defibrating material for the pulp and paper industry.
  • Pulpers are used in the pulp and paper industry to comminute a fibrous material and convert it into a pumpable suspension suitable for papermaking.
  • the pulp source can be, for example, in the form of virgin fibers (primary pulp) or recycled pulp in the form of waste paper fibers (secondary pulp).
  • the fabric is fed to a pulper having a container where the fabric is cut into fibers of suitable size and consistency to make the desired paper product therefrom.
  • the materials intended for entry into the pulper may be supplied in the form of bales / packs, rolls or sheets.
  • the entry into the container and pulper often causes the pulp to remain in the packed state, thereby delaying contact and mixing with the water. This prolongs the total dissolution time required.
  • a manual solution to the problem would be unpacking by opening the bale covers and / or separating the other fibrous layers prior to entry into the fabric release device. However, such additional measures also require manpower and additional time and expense.
  • Pulpers contain vane rotors in the container for pulping and shredding the material. These rotors can be used in a batch process in which the contents of the container are dissolved until the desired stock density is reached, after which the container is emptied and the contents are fed to paper for further processing.
  • the pulp solution can take place in a different form in a continuous manner. In this case, the container contents are for the most part internally circulated, while constantly a portion of it is withdrawn with the desired consistency for paper production.
  • Typical rotor blade shapes are backward curved vanes to achieve a pumping action in the container without requiring excessive amounts of energy.
  • the invention includes a rotor for a pulper, wherein the rotor includes an annular rotatable hub.
  • the rotor includes an annular rotatable hub.
  • Several wings are axially from the hub, each of these wings in profile, at least at the radially outermost portion, is curved against the direction of rotation.
  • the wings have a side edge facing in an axial direction.
  • On the side edge of the wings a plurality of teeth are provided at the radially outermost portion to ensure a rapid rupture of the fabric.
  • the invention in another embodiment, includes a pulper with a container containing the auflösösende material receives, and a drive shaft in the container. Attached thereto is a rotor including an annular rotatable hub and a plurality of vanes generally axially projecting from the hub. Each of these blades is at least at the radially outermost portion, curved against the direction of rotation.
  • the wings have a side edge which faces in an axial direction and a plurality of teeth which are on this side edge at the radially outermost portion and which ensure the rapid rupture of the material.
  • the invention includes a rapid process for rupturing the fabric.
  • the method comprises the steps of introducing substance and liquid into a container and driving a series of teeth in a given direction through the substance and the liquid in the container.
  • the teeth are directed with respect to this given direction of movement so that they act wedge-like on the material and the liquid and exert a shearing action.
  • a pulper 10 incorporating a container 12 wherein a quantity of water and material to be ruptured, generally designated 14, is introduced into the container.
  • the container 12 may take many different shapes and volumes to accommodate the selected amount of material to be dissolved.
  • the dissolution process is carried out by a generally designated 16 rotor, which is mounted on a drive shaft 18 which is connected to a suitable motor 20 which is to put the rotor 16 in a rotary motion.
  • the fabrics 14 in the container 12 may be discontinuously disaggregated, with the fabric being introduced into the container and torn, and after reaching the desired degree of fiberization, the container is subsequently emptied.
  • the pulper 10 could be used in a continuous mode by providing a preselected spout 22 between the perimeter of the rotor 16 and a housing 24.
  • the pumped content is in one Line 26 is conveyed behind a control valve 28 to a distribution valve 30, which divides the flow to a return line 32 and a finished product line 34.
  • Fig. 1 shows the rotor in an orientation with a horizontal axis of rotation. Many other orientations can be used with the illustrated rotor.
  • Fig. 2 shows a pulper 11 in which the rotor 16 is oriented so that its axis of rotation is vertical.
  • the rotor 16 is located on the bottom wall 13 of a container 15, which has been cut to illustrate the rotor 16.
  • the rotor 16 is driven via a suitable drive (not shown) so that it dissolves material and water in a discontinuous or continuous manner.
  • Fig. 3 is a perspective view of the rotor 16 incorporated in the pulper of Figs. 1 and 2, respectively.
  • the rotor 16 includes a central annular hub 36 having a central opening 38 which is plugged onto the drive shaft 18. Through holes 40 provide a means for releasably securing the rotor 16 to the drive shaft 18 (not shown in FIG. 3).
  • the hub 36 has a radially extending flange 42 and a series of vanes 44 extending from the hub 36.
  • the flange 42 increases the strength of the wings 44 and allows for an opening for the return or the pumping of the substance beyond the periphery of flange 42 addition.
  • Each wing 44 has a width that extends generally from the flange plane 42 axially to the side edge 46.
  • the width of the wings 44 is shown as a constant measure, but it is clear to those skilled in the art that this measure on the extent of Wing can vary.
  • the wings 44 are designed in profile so that they are curved against the direction of rotation, which is indicated by arrow 48.
  • the thickness of the wings 44 varies from the thickness shown at 50 at the radially innermost edge of the vanes 44 to a maximum thickness at 52 at the radially outermost portion of the vanes 44.
  • the thickness difference provides strength and ensures a suitable hydrodynamic flow passage between adjacent wings for appropriate pumping.
  • the bottom surface 54 of the end surface 52 at the flange plane 42 is substantially wider than the top surface 56, which characterizes the radially outer region of the side edge 46. This is also intended to increase the strength of the wings. It will be apparent to those skilled in the art that other than the differences in thickness shown, others are also suitable.
  • teeth are provided on the side edges 46 of the vanes at the radially outermost portion 52 of the vanes 44, indicated generally by reference numeral 58.
  • the teeth 58 include a plurality of teeth 60 that are separated from each other by generally rectangular passages 62.
  • the passages 62 are formed in a member 64 which, as shown here, is a separate element from the wings 44.
  • a plurality of screws 66 are provided to releasably connect the member 64 to the side edge 46 of the wings 44.
  • the teeth 60 and the intervening rectangular passages 62 are rhombic in orientation with respect to the flow direction 48, so that the leading edges 68 of the teeth 60 form a wedge shape to facilitate rupture and dissolution of the fabric.
  • FIG. 4 the teeth 60 and the intervening rectangular passages 62 are rhombic in orientation with respect to the flow direction 48, so that the leading edges 68 of the teeth 60 form a wedge shape to facilitate rupture and dissolution of the fabric.
  • the passages 62 to the side edge 46 of the wings 44 are generally at a nearly right angle.
  • the wings are curved, it comes with respect to the flow direction 48 that the Wedge shape cuts more effectively into the fabric.
  • the dissolution process is continuous and it is achieved a quick shredding.
  • the separation of the pulp in the water is accelerated to form a suspension.
  • the teeth 58 Coupled with the backward curved wings 44, the teeth 58 allow for rapid comminution and a larger contact surface with the water, thus significantly reducing the dissolution times, which in turn leads to significant energy savings.
  • the teeth 58 are separate elements that are bolted to the wings 44. It is clear to the person skilled in the art that the teeth 58 can also be fastened by other means, for example by welding or also by molding on the wings in the casting or molding process.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP07015572A 2006-08-30 2007-08-08 Procédé et appareil pour unité de dépulpage Withdrawn EP1895047A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/468,419 US20080054108A1 (en) 2006-08-30 2006-08-30 Method and apparatus for pulping unit

Publications (1)

Publication Number Publication Date
EP1895047A1 true EP1895047A1 (fr) 2008-03-05

Family

ID=38722682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07015572A Withdrawn EP1895047A1 (fr) 2006-08-30 2007-08-08 Procédé et appareil pour unité de dépulpage

Country Status (2)

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US (1) US20080054108A1 (fr)
EP (1) EP1895047A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5722232B2 (ja) * 2009-01-13 2015-05-20 バイオガソル・エピエス 有機材料の切断、浸漬、および／または洗浄などの処理
PT3194653T (pt) 2014-09-19 2019-06-11 Versalis Spa Processo contínuo para tratar uma biomassa lignocelulósica
BR112017005406B8 (pt) 2014-09-19 2022-10-25 Beta Renewables Spa Processo contínuo para tratar uma biomassa lignocelulósica

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973153A (en) * 1958-05-16 1961-02-28 Improved Machinery Inc Pulper
US3163368A (en) * 1961-12-18 1964-12-29 Bolton John W & Sons Inc Bottom drive pulper with stationary blades
US3295769A (en) * 1963-12-17 1967-01-03 Nilsson Nils Gunnar Holger Apparatus for beating and disintegrating fibrous materials in liquid suspension
US3946951A (en) * 1974-06-21 1976-03-30 Bolton-Emerson, Inc. Attrition pulper having high level thrust for grinding pulp and refining fibres

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6053441A (en) * 1997-09-04 2000-04-25 Bolton-Emerson Americas, Inc. Toroidal flow pulper for difficult materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973153A (en) * 1958-05-16 1961-02-28 Improved Machinery Inc Pulper
US3163368A (en) * 1961-12-18 1964-12-29 Bolton John W & Sons Inc Bottom drive pulper with stationary blades
US3295769A (en) * 1963-12-17 1967-01-03 Nilsson Nils Gunnar Holger Apparatus for beating and disintegrating fibrous materials in liquid suspension
US3946951A (en) * 1974-06-21 1976-03-30 Bolton-Emerson, Inc. Attrition pulper having high level thrust for grinding pulp and refining fibres

Also Published As

Publication number Publication date
US20080054108A1 (en) 2008-03-06

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