EP0328500A2 - Device to disintegrate paper, cardboard and the like - Google Patents

Device to disintegrate paper, cardboard and the like Download PDF

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Publication number
EP0328500A2
EP0328500A2 EP89850030A EP89850030A EP0328500A2 EP 0328500 A2 EP0328500 A2 EP 0328500A2 EP 89850030 A EP89850030 A EP 89850030A EP 89850030 A EP89850030 A EP 89850030A EP 0328500 A2 EP0328500 A2 EP 0328500A2
Authority
EP
European Patent Office
Prior art keywords
rotor
blades
disintegrating
tub
pumping
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
EP89850030A
Other languages
German (de)
French (fr)
Other versions
EP0328500A3 (en
EP0328500B1 (en
Inventor
Jyrki Paavola
Jorma Halla
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.)
Sunds Defibrator Jylha OY
Original Assignee
Sunds Defibrator Jylha OY
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 Sunds Defibrator Jylha OY filed Critical Sunds Defibrator Jylha OY
Publication of EP0328500A2 publication Critical patent/EP0328500A2/en
Publication of EP0328500A3 publication Critical patent/EP0328500A3/en
Application granted granted Critical
Publication of EP0328500B1 publication Critical patent/EP0328500B1/en
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
    • D21B1/347—Rotor assemblies

Definitions

  • This invention is related to a device to disintegrate paper, cardboard and similar materials, which device consists of a tub into which the material to be disintegrated is fed and from which it is removed in the disintegrated state, and of at least one rotating rotor with several blades, situated on one of the walls of the tub.
  • pulpers used for disintegrating the web have been developed by that the installed motor power has been increased so that the paper or any similar material could be disintegrated quickly enough into a form in which it can be pumped.
  • Pulpers are also used for disintegrating bale pulp, broke rolls and similar solid materials. In that case the disintegrating organ of the pulper, the rotor, is situated at the bottom of the tub.
  • the object of this invention is to achieve a new rotor that can be used both in horizontal and in vertical pulpers, and of which rotors there can be one or more in the same tub.
  • a device according to the invention is characterized by that at least one of the blades is a pumping blade and at least one a disintegrating blade.
  • An advantageous embodiment of a device according to the invention is characterized by that there are equally many pumping blades and disintegrating blades, and that they have been arranged in the rotor's direction of rotation alternately.
  • Another advantageous embodiment of a device according to the invention is characterized by that the three pumping blades of a six-bladed rotor extend from the periphery of the rotor to the centre of the rotor, forming a solid pumping blade unit, and that the disintegrating blades formed between these pumping blades have disintegrating teeth for mechanical tearing that extend from the periphery of the rotor only to the edge of the rotor's body.
  • Still another advantageous embodiment of a device according to the invention is characterized by that the disintegrating teeth have been installed in such a manner that they are replaceable.
  • Essential in a rotor according to the invention is that it combines mechanical disintegration with a powerful acceleration of stock, which increases hydraulic disintegration, i.e. strengthens the cutting forces in the liquid.
  • the pumping blades cause the hydraulic forces of disintegration and the replaceable disintegrating teeth of the disintegrating blades carry out the mechanical disintegration work.
  • the disintegration time and the disintegration consistency can be selected to suit the production in question.
  • the installed power of pulpers of prior art with current paper machines is from 1,000 kW to 1,500 kW, which means that yearly savings from Fmk 850,000 to Fmk 1,300,000 in operating costs are obtained if the price of electric energy is 20 p/kWh.
  • the reliability of operation is improved considerably, since variations of production do not cause motor stoppages due to overloading.
  • Figure 1 shows a known pulper (Finnish patent No. 72356), i.e. a device to disintegrate paper, cardboard and the like.
  • the device can be placed for instance under a big paper machine, in which case the feeding into the tub 1 of the material to be disintegrated happens through the open top of the tub.
  • the disintegration of the paper or cardboard in the tub 1 is carried out with rotating rotors 3.
  • the number of rotors is two, and they are situated on the same wall of the tub.
  • the driving motors 4 of the rotors are situated outside the tub, coaxially with the rotors.
  • the rotors in this known device are conventional ones, i.e. they have numerous tearing blades of essentially the same kind.
  • Figure 2 shows a six-bladed rotor 3 according to the invention, such as can be used both in horizontal and in vertical pulpers; and there can be one or more of them in the same tub.
  • the three pumping blades 2 of the six-bladed rotor 3 extend from the periphery of the rotor 3 to the centre of the rotor, forming a solid pumping blade unit 8. Between these pumping blades have been formed disintegrating blades 5 that have been equipped with disintegrating teeth 6 for tearing that extend from the periphery of the rotor only to the edge of the body of the rotor 3.
  • Figure 3 shows the teeth 6, which can be in one piece that is fastened replaceably on the disintegrating blade 5 by inserting bolts or similar elements through the holes 7.
  • the tooth piece is curved in the way shown in Figure 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Sorting Of Articles (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Crushing And Grinding (AREA)
  • Fats And Perfumes (AREA)
  • Compounds Of Unknown Constitution (AREA)

Abstract

Device to disintegrate paper, cardboard and similar materials, which device consists of a tub (1) into which the material to be disintegrated is fed and from which it is removed in the disintegrated state, and of at least one rotating rotor (3) with several blades (2, 5), situated on one of the walls of the tub (1). Current pulpers work effectively only with a mild consistency. When the consistency increases the disintegrating power decreases essentially. With the invention the problem has been solved by that at least one of the blades is a pumping blade (2) and at least one a disintegrating blade (5).

Description

  • This invention is related to a device to disintegrate paper, cardboard and similar materials, which device consists of a tub into which the material to be disintegrated is fed and from which it is removed in the disintegrated state, and of at least one rotating rotor with several blades, situated on one of the walls of the tub.
  • With the paper and cardboard machines getting bigger, pulpers used for disintegrating the web have been developed by that the installed motor power has been increased so that the paper or any similar material could be disintegrated quickly enough into a form in which it can be pumped. Pulpers are also used for disintegrating bale pulp, broke rolls and similar solid materials. In that case the disintegrating organ of the pulper, the rotor, is situated at the bottom of the tub.
  • All current so-called horizontal and vertical pulpers require relatively much power to cope with the bigger amounts to be disintegrated due to increased production. Moreover, those pulpers work effectively only with a low consistency. With higher consistencies the disintegrating power of these current models diminishes drastically. For higher consistencies there have been developed so-called high-consistency pulpers, but they have the disadvantage of not being able to be used continuously.
  • Regarding prior art, reference is still made to Finnish patent No. 72356, which presents a horizontal pulper with two rotors installed on one wall of the tub in such a way that straight lines running through the axial lines of the rotors intersect at least in one projection. Also that pulper suffers from the disadvantages explained above.
  • The object of this invention is to achieve a new rotor that can be used both in horizontal and in vertical pulpers, and of which rotors there can be one or more in the same tub. A device according to the invention is characterized by that at least one of the blades is a pumping blade and at least one a disintegrating blade.
  • An advantageous embodiment of a device according to the invention is characterized by that there are equally many pumping blades and disintegrating blades, and that they have been arranged in the rotor's direction of rotation alternately.
  • Another advantageous embodiment of a device according to the invention is characterized by that the three pumping blades of a six-bladed rotor extend from the periphery of the rotor to the centre of the rotor, forming a solid pumping blade unit, and that the disintegrating blades formed between these pumping blades have disintegrating teeth for mechanical tearing that extend from the periphery of the rotor only to the edge of the rotor's body.
  • Still another advantageous embodiment of a device according to the invention is characterized by that the disintegrating teeth have been installed in such a manner that they are replaceable.
  • Essential in a rotor according to the invention is that it combines mechanical disintegration with a powerful acceleration of stock, which increases hydraulic disintegration, i.e. strengthens the cutting forces in the liquid. In a device according to the invention the pumping blades cause the hydraulic forces of disintegration and the replaceable disintegrating teeth of the disintegrating blades carry out the mechanical disintegration work.
  • In tests carried out it has been possible to cut the power consumption to almost a half with a device according to the invention in comparison to devices of prior art. In addition, the disintegration time and the disintegration consistency can be selected to suit the production in question. The installed power of pulpers of prior art with current paper machines is from 1,000 kW to 1,500 kW, which means that yearly savings from Fmk 850,000 to Fmk 1,300,000 in operating costs are obtained if the price of electric energy is 20 p/kWh. Moreover, with a device according to the invention the reliability of operation is improved considerably, since variations of production do not cause motor stoppages due to overloading.
  • In the following the invention is explained in detail by means of examples of advantageous embodiments, with reference to the attached drawings among which
    • Fig. 1 shows from a above a know device to disintegrate paper, cardboard and the like,
    • Fig. 2 shows in a perspective a rotor according to the invention,
    • Fig. 3 shows the replaceable teeth of a disintegrating blade of a rotor according to the invention,
    • Fig. 4 shows the same as Fig. 3, but seen from the direction of the teeth.
  • Figure 1 shows a known pulper (Finnish patent No. 72356), i.e. a device to disintegrate paper, cardboard and the like. The device can be placed for instance under a big paper machine, in which case the feeding into the tub 1 of the material to be disintegrated happens through the open top of the tub. The disintegration of the paper or cardboard in the tub 1 is carried out with rotating rotors 3. In Figure 1 the number of rotors is two, and they are situated on the same wall of the tub. The driving motors 4 of the rotors are situated outside the tub, coaxially with the rotors. The rotors in this known device are conventional ones, i.e. they have numerous tearing blades of essentially the same kind.
  • Figure 2 shows a six-bladed rotor 3 according to the invention, such as can be used both in horizontal and in vertical pulpers; and there can be one or more of them in the same tub. The three pumping blades 2 of the six-bladed rotor 3 extend from the periphery of the rotor 3 to the centre of the rotor, forming a solid pumping blade unit 8. Between these pumping blades have been formed disintegrating blades 5 that have been equipped with disintegrating teeth 6 for tearing that extend from the periphery of the rotor only to the edge of the body of the rotor 3.
  • Figure 3 shows the teeth 6, which can be in one piece that is fastened replaceably on the disintegrating blade 5 by inserting bolts or similar elements through the holes 7. The tooth piece is curved in the way shown in Figure 4.
  • It is obvious to a person skilled in the art that the embodiments of the invention are not restricted to the examples given above, but can be varied within the scope of the following patent claims.

Claims (4)

1. Device to disintegrate paper, cardboard and similar materials, which device consists of a tub (1) into which the material to be disintegrated is fed and from which it is removed in the disintegrated state, and of at least one rotating rotor (3) with several blades (2, 5), situated on one of the walls of the tub (1), characterized by that at least one of the blades is a pumping blade (2) and at least one a disintegrating blade (5).
2. Device according to Claim 1, characterized by that there are equally many pumping blades (2) and disintegrating blades (5), and that they have been arranged in the rotor's direction of rotation alternately.
3. Device according to Claim 1 or 2, characterized by that the three pumping blades (2) of a six-bladed rotor (3) extend from the periphery of the rotor to the centre of the rotor, forming a solid pumping blade unit (8), and that the disintegrating blades (5) formed between these pumping blades (2) have disintegrating teeth (6) for mechanical tearing that extend from the periphery of the rotor only to the edge of the rotor's body.
4. Device according to any of the Claims 1-3, characterized by that the disintegrating teeth (6) have been installed in such a manner that they are replaceable.
EP89850030A 1988-02-10 1989-02-02 Device to disintegrate paper, cardboard and the like Expired - Lifetime EP0328500B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI880609A FI78934C (en) 1988-02-10 1988-02-10 ANORDNING FOER DESTRUKTION AV PAPPER, KARTONG ELLER DYLIKA.
FI880609 1988-02-10

Publications (3)

Publication Number Publication Date
EP0328500A2 true EP0328500A2 (en) 1989-08-16
EP0328500A3 EP0328500A3 (en) 1991-06-05
EP0328500B1 EP0328500B1 (en) 1994-08-03

Family

ID=8525883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89850030A Expired - Lifetime EP0328500B1 (en) 1988-02-10 1989-02-02 Device to disintegrate paper, cardboard and the like

Country Status (5)

Country Link
EP (1) EP0328500B1 (en)
AT (1) ATE109528T1 (en)
DE (1) DE68917168T2 (en)
FI (1) FI78934C (en)
NO (1) NO174011C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1010118A3 (en) * 1996-04-05 1998-01-06 Magotteaux Int Mixer propeller
WO1998017393A1 (en) * 1996-10-22 1998-04-30 Jeffrey Robert Wood Pulping apparatus
EP1036877A1 (en) * 1999-03-05 2000-09-20 Voith Sulzer Papiertechnik Patent GmbH Rotor with wear protector for a pulper

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707267A (en) * 1971-02-24 1972-12-26 Beloit Corp Replaceable vane insert for impeller
US3889885A (en) * 1974-01-11 1975-06-17 Black Clawson Co Pulping apparatus
US4109872A (en) * 1977-07-29 1978-08-29 The Black Clawson Company Pulping apparatus for liquid slurry stock
NL7712833A (en) * 1977-11-03 1979-05-07 Eximco Naamloze Vennootschap Rotor with vane cutting edges clad with sharp carbide granules - esp. for grinding and opening waste paper to form fibrous slurry for mfg. paper or board

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707267A (en) * 1971-02-24 1972-12-26 Beloit Corp Replaceable vane insert for impeller
US3889885A (en) * 1974-01-11 1975-06-17 Black Clawson Co Pulping apparatus
US4109872A (en) * 1977-07-29 1978-08-29 The Black Clawson Company Pulping apparatus for liquid slurry stock
NL7712833A (en) * 1977-11-03 1979-05-07 Eximco Naamloze Vennootschap Rotor with vane cutting edges clad with sharp carbide granules - esp. for grinding and opening waste paper to form fibrous slurry for mfg. paper or board

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1010118A3 (en) * 1996-04-05 1998-01-06 Magotteaux Int Mixer propeller
WO1998017393A1 (en) * 1996-10-22 1998-04-30 Jeffrey Robert Wood Pulping apparatus
EP1036877A1 (en) * 1999-03-05 2000-09-20 Voith Sulzer Papiertechnik Patent GmbH Rotor with wear protector for a pulper

Also Published As

Publication number Publication date
NO174011B (en) 1993-11-22
NO890560L (en) 1989-08-11
EP0328500A3 (en) 1991-06-05
EP0328500B1 (en) 1994-08-03
FI880609A0 (en) 1988-02-10
NO174011C (en) 1994-03-02
FI78934C (en) 1989-10-10
FI78934B (en) 1989-06-30
ATE109528T1 (en) 1994-08-15
DE68917168T2 (en) 1994-11-24
NO890560D0 (en) 1989-02-09
DE68917168D1 (en) 1994-09-08

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