EP0328500B1 - Device to disintegrate paper, cardboard and the like - Google Patents
Device to disintegrate paper, cardboard and the likeInfo
- Publication number
- EP0328500B1 EP0328500B1 EP89850030A EP89850030A EP0328500B1 EP 0328500 B1 EP0328500 B1 EP 0328500B1 EP 89850030 A EP89850030 A EP 89850030A EP 89850030 A EP89850030 A EP 89850030A EP 0328500 B1 EP0328500 B1 EP 0328500B1
- 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.)
- Expired - Lifetime
Links
Images
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, at least one of the blades being a pumping blade and at least one a disintegrating blade, whereby there are equally as many pumping blades as disintegrating blades, which have been arranged alternately in the rotor's direction of rotation.
- 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.
- US-A-3 889 885 discloses 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 at least one rotating rotor with several blades, situated on one of the walls of the tub, at least one of the blades being a pumping blade and at least one a disintegrating blade.
- This device however requires as high power consumption as earlier known devices.
- the object of this invention is to achieve a new rotor that can be used both in horizontal and in vertical pulpers, and which rotor will give a considerable reduction of the power consumption.
- a device 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, which teeth extend from the periphery of the rotor only to the edge of the Rotor's body.
- 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 rotor 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.
- Still another advantageous embodiment of a device according to the invention is characterized by that the disintergrating 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 saving 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 operat on is improved considerably, since variations of production do not cause motor stoppages due to overloading.
- 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)
- Fats And Perfumes (AREA)
- Compounds Of Unknown Constitution (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Crushing And Grinding (AREA)
Abstract
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, at least one of the blades being a pumping blade and at least one a disintegrating blade, whereby there are equally as many pumping blades as disintegrating blades, which have been arranged alternately in the rotor's direction of rotation.
- 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 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 the pulper suffers from the disadvantages explained above.
- US-A-3 889 885 discloses 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 at least one rotating rotor with several blades, situated on one of the walls of the tub, at least one of the blades being a pumping blade and at least one a disintegrating blade. This device however requires as high power consumption as earlier known devices.
- The object of this invention is to achieve a new rotor that can be used both in horizontal and in vertical pulpers, and which rotor will give a considerable reduction of the power consumption.
- 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, which teeth extend from the periphery of the rotor only to the edge of the Rotor's body.
- 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 the number of rotor 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. - Still another advantageous embodiment of a device according to the invention is characterized by that the disintergrating 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 saving 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 operat on is improved considerably, since variations of production do not cause motor stoppages due to overloading.
- 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 solidpumping blade unit 8. Between these pumping blades have been formed disintegratingblades 5 that have been equipped with disintegratingteeth 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 disintegratingblade 5 by inserting bolts or similar elements through theholes 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 (2)
- 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), at least one of the blades being a pumping blade (2) and at least one a disintegrating blade (5), whereby there are equally as many pumping blades (2) as disintegrating blades (5), which have been arranged alternately in the rotor's direction of rotation,
characterized therein
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, which teeth extend from the periphery of the rotor only to the edge of the Rotor's body. - Device according to claim 1,
characterized therein
that the disintegrating teeth (6) have been installed in a replaceable manner.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI880609 | 1988-02-10 | ||
FI880609A FI78934C (en) | 1988-02-10 | 1988-02-10 | ANORDNING FOER DESTRUKTION AV PAPPER, KARTONG ELLER DYLIKA. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0328500A2 EP0328500A2 (en) | 1989-08-16 |
EP0328500A3 EP0328500A3 (en) | 1991-06-05 |
EP0328500B1 true 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) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1010118A3 (en) * | 1996-04-05 | 1998-01-06 | Magotteaux Int | Mixer propeller |
AUPO314396A0 (en) * | 1996-10-22 | 1996-11-14 | Wood, Jeffrey Robert | Pulping apparatus |
DE59901791D1 (en) * | 1999-03-05 | 2002-07-25 | Voith Paper Patent Gmbh | Rotor with wear protection for a pulper |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3716370A (en) * | 1971-02-24 | 1973-02-13 | Robolex Inc | A method of heating a package of food |
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 |
BE860386A (en) * | 1977-11-03 | 1978-03-01 | Eximco N V | ROTOR FOR A DEVICE FOR THE PREPARATION OF FIBER PURGE FOR OBTAINING PAPER OR CARDBOARD |
-
1988
- 1988-02-10 FI FI880609A patent/FI78934C/en active IP Right Grant
-
1989
- 1989-02-02 DE DE68917168T patent/DE68917168T2/en not_active Expired - Lifetime
- 1989-02-02 AT AT89850030T patent/ATE109528T1/en not_active IP Right Cessation
- 1989-02-02 EP EP89850030A patent/EP0328500B1/en not_active Expired - Lifetime
- 1989-02-09 NO NO890560A patent/NO174011C/en unknown
Also Published As
Publication number | Publication date |
---|---|
FI78934C (en) | 1989-10-10 |
FI880609A0 (en) | 1988-02-10 |
ATE109528T1 (en) | 1994-08-15 |
NO174011C (en) | 1994-03-02 |
FI78934B (en) | 1989-06-30 |
NO890560D0 (en) | 1989-02-09 |
NO174011B (en) | 1993-11-22 |
NO890560L (en) | 1989-08-11 |
EP0328500A3 (en) | 1991-06-05 |
EP0328500A2 (en) | 1989-08-16 |
DE68917168D1 (en) | 1994-09-08 |
DE68917168T2 (en) | 1994-11-24 |
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