CA2113737C - Method and device for processing wastepaper - Google Patents
Method and device for processing wastepaperInfo
- Publication number
- CA2113737C CA2113737C CA 2113737 CA2113737A CA2113737C CA 2113737 C CA2113737 C CA 2113737C CA 2113737 CA2113737 CA 2113737 CA 2113737 A CA2113737 A CA 2113737A CA 2113737 C CA2113737 C CA 2113737C
- Authority
- CA
- Canada
- Prior art keywords
- screen
- screens
- endless
- coarse
- combination
- 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 - Fee Related
Links
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
- D21B1/32—Defibrating by other means of waste paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
An apparatus for disintegrating bulks of wastepaper into individual fibers and for removing contaminants from the fibers comprises a series of high-pressure water jets and a series of endless revolving screens of different mesh sizes. The high-pressure jets for disintegrating the wastepaper are positioned above the upper parts of the screens. The screens are configured in such a way that the screens of finer mesh sizes are located below those of larger mesh sizes with the coarsest screen at the top and the finest screen at the bottom. The apparatus combination has means to screen and wash the disintegrated fibers, and remove contaminants from the usable fibers.
Description
137~ ~
METHOD AND DEVICE FOR PROCESSING WASTEP~PER
Back~round of the Invention This invention relates to the processing of wastepaper, and more s particularly to methods of and device for disintegrating a bulk of wastepaper into individual fibers and separating these individual fibers from cont~min~nt.ssuch as metals, plastics and ink particles, etc.
The invention is especially concerned with the disintegration of bulks of wastepaper, and more particularly old newspaper, old magazine, computer printouts, mixed office wastepaper, paperboard, carton and any other types of preconsumer and postconsumer paper product, to produce pulp fibers for m~king new paper, paperboard or carton, etc.
Heretofore, conventional practice for processing wastepaper for paper or board production has involved the mechanical disintegration of said wastepaper using a pulper (an disintegrator used in the pulp and paper industry for repulping wastepaper) equipped with revolving blades, water and chemicals such as sodium hydroxide and dispersing agents, etc.; the screening to remove coarse cont~min~nts such as metal and plastics, etc.; the high density cleaning using hydrocyclone to elimin~te smaller contraries such as 20 metal, sands, grits, etc.; the flotation cell to remove ink particles; and the washing to eliminate fine ink particles and fillers. Such a conventional method requires large capital investment and high operating costs.
Industrial uses of high-pressure water jets for cleaning, mining and debarking of wood logs, etc., are well known. In a Canadian patent 25 application (No. 2,098,515, June 16, 1993) Ali taught the use of liquid stream with or without chemicals and temperatures to make pulp from cellulosic materials like wood, waste papers and non-wood plants. Ali's ~ 2 1 113 7 3 7 technique teaches us how to disintegrate a primary cellulosic material into a secondary material of different form and size for further treatment by conventional means, but it does not teach us, for example in the case of waste papers, how to separate useful fibers from cont~min~nts.
s One of the objects of this invention is the provision of an improved method of more economically transforming wastepaper into individual fibers for m~king new paper or any other kinds of fibrous products. Another object is the provision of such methods that may effect improved economy by reduction of initial equipment cost, reduction of energy consumption and elimination of chemical cost. It is also the object of this invention to provide a method that, in addition to the stated economic advantages, produces fibers of requisite quality for manufacturing good quality paper and any other types of paper product.
Theory of the Invention Wood fibers are hygroscopic in nature; they form paper via the chemical bonds called hydrogen bonds between individual fibers during a drying process. Inversely, the inter-fiber bonds can be weakened and removed by subjecting the paper to an environment of liquid water or water vapor. When a sheet of paper, in which the fibers are de-bonded, is subjected to an external force, such as a high pressure water jet, the individual fibers can be released producing a pulp slurry.
When a bulk of wastepaper, which may contain various kinds of cont~min~nts such as ink, adhesive tapes, plastics and metal, etc., is placed on a screen with relatively large mesh size and subjected to a high-pressure jet of water, which provides both the wetting effect and the mechanical force required for de-bonding and liberating the fibers, de-fiberization takes place r. 21 1373 7 reducing the bulk of wastepaper into a pulp slurry or suspension. Under the influence of such a high-pressure jet of water, the released individual fibers and the small cont~min~nts, such as ink particles, are forced through the wire meshes, leaving the coarse cont~min~nt~ on the screen. Such a method of s treatment of wastepaper achieves three important functions of de-fiberization of the bulk of wastepaper, dislodging ink particles from fiber surface and screening out the large cont~min~nts. Using multiple combinations of high-pressure water jets and screens of different mesh sizes, it is possible to produce a clean pulp suitable for m~king paper or for further processing. In o fact, one can achieve these three principal purposes, namely de-fiberization, screening and washing, without the use of expensive equipment such as pulpers, screens, hydrocyclones, flotation cells and press washers, etc. as in conventional de-inking processes.
15 Brief Description of the Invention In general, the method of this invention involves reducing a bulk of wastepaper to individual fibers suitable for use in the manufacture of new paper or any other kinds of paper product. The method comprises the procedures of placing the bulk of wastepaper on an endless revolving screen 20 of suitable mesh size, subjecting it to a high-pressure liquid jet and affecting a movement of the screen so that the liquid jets continuously impinge on the bulk of wastepaper. As the liquid impacts onto the bulk of wastepaper, the printed ink is reduced to fine particles and dislodged from the fiber surfaces, while the individual fibers are simultaneously liberated from the bulk and 25 forced through the screen with meshes larger than the length of the liberated fibers. The resistant cont~min~nts such as plastic materials having a r 21 1373 7 dimension larger than the mesh sizes remain on the revolving screen and are removed by gravity and a water shower.
The liberated fibers and the smaller contaminants that passed through the first coarse screen are retained on a second endless revolving screen of s finer mesh size, located underneath the first coarse screen, and subjected to high-pressure water jets that effect further de-fiberization, screening and washing actions that may be further repeated using finer screens.
One of the embodiments of this invention comprises a series of three or more endless revolving screens configured in such a way that the screens with larger mesh sizes are positioned above those of smaller mesh sizes; the coarsest one being on the top of all the others and the finest one at the bottom.
In another aspect of the invention, means are provided to recover, treat and re-utilize the white water used in the system, to minimi7e the consumption of water.
Specific Description of the Invention The invention, as exemplified by a preferred embodiment, is described with reference to the drawings in which:
Figure 1 is a sectional view of an embodiment of an apparatus of the invention;
Figure 2 is a perspective view of part of the apparatus shown in Figure l;
Figure 3 is a perspective view of part of the apparatus shown in Figure 2.
Referring to drawings, the embodiment of the invention shown, an apparatus 2 comprises a conveyor 18, four endless screens 10, 12, 14 and 16, F 21 ~373 7 one narrow angle high-impact water jet 22, four high-pressure washing jets 24, 26,28 30, four intermediate-pressure washing jets 32, 34, 36, 38, three white waters (used water) collectors 40, 42, 44, one accept collector 46, and three reject collectors 48, 50, 52.
The conveyor 18, located at the top end of the coarsest screen 10, is used to continuously feed the apparatus 2 with wastepaper 58, and it revolves in the same direction as the screens 10, 12, 14, 16 do.
The screens 10, 12, 14 16 are configured in such as way that the finer ones are positioned below the coarser ones, with the coarsest one 10 on the o top and the finest one 16 at the bottom. The screens 10, 12, 14, 16 are supported by motorized rolls 20.
The high-impact water jet 22 is located near the feeding end of the coarsest screen 10, while the high-pressure washing jet 24 is located immediately after the high-impact water jet 22. The high-pressure washing S jets 26, 28, 30 are, respectively, located above the screens 12, 14, 16. These high-pressure washing jets 24, 26, 28, 30 are positioned in series without overlapping each other. The high-pressure washing jets 24, 26, 28 are used to washed the fibrous material through meshes 56 of the screens 10, 12, 14, while the high-pressure washing jet 30 is used to wash off the fine cont~min~nts, such as ink particles, from the de-fiberized wastepaper.
The intermediate-pressure washing jets 32, 34, 36, 38, are located, respectively, above the lower part of the screens 16, 14, 12, 10. The washing jets 32 is used to remove the accept of fibers from the finest screen 16 into the accept collector 46, while the washing jets 34, 36, 38 are used to wash off the cont;~min~nts on the respective screens 14, 12, 10 into the respective reject collectors 48, 50, 52.
~2 1 ~ 3 7 3 7 The white water collectors 40, 42, 44 are, respectively, located under the screens 12, 14, 16. The white water collectors 40, 42 under the screens 12 and 14, respectively, are positioned immediately before, but not directly under, their respective high-pressure washing jets 26, 28. However, the white 5 water collector 44 located under the finest screen 16 is extended to cover the area directly under the high-pressure washing jet 30.
In order to disclose more clearly the nature of the present invention, the following example illustrating the invention is given. It should be understood, however, that this is done solely by way of example and is intended neither to delineate the scope of the invention nor limit the ambit of the appended claims.
This example illustrates the de-fiberization of a bulk of wastepaper 58 on a revolving coarse screen 10 under a mechanical force of the high-impact water jet 22. As the wastepaper 58 moves forward it is subjected to the action of the high-impact water jet 22. The highly concentrated water particles 54 strike onto the fibers 60 stretching across the meshes 56 of the screen 10.
With the wires 62 of the screen 10 acting in opposite direction of the water particles 54, the fibers 60 of the bulk of wastepaper 58 are de-bonded and liberated either individually or in bundles, or in flakes. Under the mechanical 20 force of the high-impact water jet 22, the partially de-fiberized wastepaper passes through the meshes 56 of the coarse screen 10 and onto the revolving finer screen 12, while larger bundles of fibers will be further de-fiberized by the high-pressure washing jet 24 and forced through the meshes 56 of the coarse screen 10. The fully liberated fibers and the partially de-fiberized 25 wastepaper (or fiber bundles) deposited onto the finer screen 12 are subjected to the action of the high-pressure washing jet 26. These de-fiberization and washing actions are repeated on screens of finer mesh sizes 14, 16. The ~ ~ ~ 1 3 ~ 3 Z
accept of pulp fibers is doctored off by means of the intermediate-pressure washing jet 32 and collected by the accept collector 46. Any large contaminants that cannot be broken down by the high-impact water jet 22 and the high-pressure washing jets 24, 26, 28 are removed by the intermediate-s pressure washing jets 34, 36, 38 and collected by the respective rejectcollectors 48, 50, 52. The fine ink particles are received by the white water collectors 40, 42, 44.
A feature of the apparatus combination 2 of this invention is its ability to disintegrate a bulk of wastepaper into individual fibers suitable for o manufacturing new paper products and remove the cont~min~nts from the usable fibers.
Although only a single embodiment of the present invention has been described and illustrated, the present invention is not limited to the feature of this embodiment, but includes all variations and modifications within the scope of the claims.
METHOD AND DEVICE FOR PROCESSING WASTEP~PER
Back~round of the Invention This invention relates to the processing of wastepaper, and more s particularly to methods of and device for disintegrating a bulk of wastepaper into individual fibers and separating these individual fibers from cont~min~nt.ssuch as metals, plastics and ink particles, etc.
The invention is especially concerned with the disintegration of bulks of wastepaper, and more particularly old newspaper, old magazine, computer printouts, mixed office wastepaper, paperboard, carton and any other types of preconsumer and postconsumer paper product, to produce pulp fibers for m~king new paper, paperboard or carton, etc.
Heretofore, conventional practice for processing wastepaper for paper or board production has involved the mechanical disintegration of said wastepaper using a pulper (an disintegrator used in the pulp and paper industry for repulping wastepaper) equipped with revolving blades, water and chemicals such as sodium hydroxide and dispersing agents, etc.; the screening to remove coarse cont~min~nts such as metal and plastics, etc.; the high density cleaning using hydrocyclone to elimin~te smaller contraries such as 20 metal, sands, grits, etc.; the flotation cell to remove ink particles; and the washing to eliminate fine ink particles and fillers. Such a conventional method requires large capital investment and high operating costs.
Industrial uses of high-pressure water jets for cleaning, mining and debarking of wood logs, etc., are well known. In a Canadian patent 25 application (No. 2,098,515, June 16, 1993) Ali taught the use of liquid stream with or without chemicals and temperatures to make pulp from cellulosic materials like wood, waste papers and non-wood plants. Ali's ~ 2 1 113 7 3 7 technique teaches us how to disintegrate a primary cellulosic material into a secondary material of different form and size for further treatment by conventional means, but it does not teach us, for example in the case of waste papers, how to separate useful fibers from cont~min~nts.
s One of the objects of this invention is the provision of an improved method of more economically transforming wastepaper into individual fibers for m~king new paper or any other kinds of fibrous products. Another object is the provision of such methods that may effect improved economy by reduction of initial equipment cost, reduction of energy consumption and elimination of chemical cost. It is also the object of this invention to provide a method that, in addition to the stated economic advantages, produces fibers of requisite quality for manufacturing good quality paper and any other types of paper product.
Theory of the Invention Wood fibers are hygroscopic in nature; they form paper via the chemical bonds called hydrogen bonds between individual fibers during a drying process. Inversely, the inter-fiber bonds can be weakened and removed by subjecting the paper to an environment of liquid water or water vapor. When a sheet of paper, in which the fibers are de-bonded, is subjected to an external force, such as a high pressure water jet, the individual fibers can be released producing a pulp slurry.
When a bulk of wastepaper, which may contain various kinds of cont~min~nts such as ink, adhesive tapes, plastics and metal, etc., is placed on a screen with relatively large mesh size and subjected to a high-pressure jet of water, which provides both the wetting effect and the mechanical force required for de-bonding and liberating the fibers, de-fiberization takes place r. 21 1373 7 reducing the bulk of wastepaper into a pulp slurry or suspension. Under the influence of such a high-pressure jet of water, the released individual fibers and the small cont~min~nts, such as ink particles, are forced through the wire meshes, leaving the coarse cont~min~nt~ on the screen. Such a method of s treatment of wastepaper achieves three important functions of de-fiberization of the bulk of wastepaper, dislodging ink particles from fiber surface and screening out the large cont~min~nts. Using multiple combinations of high-pressure water jets and screens of different mesh sizes, it is possible to produce a clean pulp suitable for m~king paper or for further processing. In o fact, one can achieve these three principal purposes, namely de-fiberization, screening and washing, without the use of expensive equipment such as pulpers, screens, hydrocyclones, flotation cells and press washers, etc. as in conventional de-inking processes.
15 Brief Description of the Invention In general, the method of this invention involves reducing a bulk of wastepaper to individual fibers suitable for use in the manufacture of new paper or any other kinds of paper product. The method comprises the procedures of placing the bulk of wastepaper on an endless revolving screen 20 of suitable mesh size, subjecting it to a high-pressure liquid jet and affecting a movement of the screen so that the liquid jets continuously impinge on the bulk of wastepaper. As the liquid impacts onto the bulk of wastepaper, the printed ink is reduced to fine particles and dislodged from the fiber surfaces, while the individual fibers are simultaneously liberated from the bulk and 25 forced through the screen with meshes larger than the length of the liberated fibers. The resistant cont~min~nts such as plastic materials having a r 21 1373 7 dimension larger than the mesh sizes remain on the revolving screen and are removed by gravity and a water shower.
The liberated fibers and the smaller contaminants that passed through the first coarse screen are retained on a second endless revolving screen of s finer mesh size, located underneath the first coarse screen, and subjected to high-pressure water jets that effect further de-fiberization, screening and washing actions that may be further repeated using finer screens.
One of the embodiments of this invention comprises a series of three or more endless revolving screens configured in such a way that the screens with larger mesh sizes are positioned above those of smaller mesh sizes; the coarsest one being on the top of all the others and the finest one at the bottom.
In another aspect of the invention, means are provided to recover, treat and re-utilize the white water used in the system, to minimi7e the consumption of water.
Specific Description of the Invention The invention, as exemplified by a preferred embodiment, is described with reference to the drawings in which:
Figure 1 is a sectional view of an embodiment of an apparatus of the invention;
Figure 2 is a perspective view of part of the apparatus shown in Figure l;
Figure 3 is a perspective view of part of the apparatus shown in Figure 2.
Referring to drawings, the embodiment of the invention shown, an apparatus 2 comprises a conveyor 18, four endless screens 10, 12, 14 and 16, F 21 ~373 7 one narrow angle high-impact water jet 22, four high-pressure washing jets 24, 26,28 30, four intermediate-pressure washing jets 32, 34, 36, 38, three white waters (used water) collectors 40, 42, 44, one accept collector 46, and three reject collectors 48, 50, 52.
The conveyor 18, located at the top end of the coarsest screen 10, is used to continuously feed the apparatus 2 with wastepaper 58, and it revolves in the same direction as the screens 10, 12, 14, 16 do.
The screens 10, 12, 14 16 are configured in such as way that the finer ones are positioned below the coarser ones, with the coarsest one 10 on the o top and the finest one 16 at the bottom. The screens 10, 12, 14, 16 are supported by motorized rolls 20.
The high-impact water jet 22 is located near the feeding end of the coarsest screen 10, while the high-pressure washing jet 24 is located immediately after the high-impact water jet 22. The high-pressure washing S jets 26, 28, 30 are, respectively, located above the screens 12, 14, 16. These high-pressure washing jets 24, 26, 28, 30 are positioned in series without overlapping each other. The high-pressure washing jets 24, 26, 28 are used to washed the fibrous material through meshes 56 of the screens 10, 12, 14, while the high-pressure washing jet 30 is used to wash off the fine cont~min~nts, such as ink particles, from the de-fiberized wastepaper.
The intermediate-pressure washing jets 32, 34, 36, 38, are located, respectively, above the lower part of the screens 16, 14, 12, 10. The washing jets 32 is used to remove the accept of fibers from the finest screen 16 into the accept collector 46, while the washing jets 34, 36, 38 are used to wash off the cont;~min~nts on the respective screens 14, 12, 10 into the respective reject collectors 48, 50, 52.
~2 1 ~ 3 7 3 7 The white water collectors 40, 42, 44 are, respectively, located under the screens 12, 14, 16. The white water collectors 40, 42 under the screens 12 and 14, respectively, are positioned immediately before, but not directly under, their respective high-pressure washing jets 26, 28. However, the white 5 water collector 44 located under the finest screen 16 is extended to cover the area directly under the high-pressure washing jet 30.
In order to disclose more clearly the nature of the present invention, the following example illustrating the invention is given. It should be understood, however, that this is done solely by way of example and is intended neither to delineate the scope of the invention nor limit the ambit of the appended claims.
This example illustrates the de-fiberization of a bulk of wastepaper 58 on a revolving coarse screen 10 under a mechanical force of the high-impact water jet 22. As the wastepaper 58 moves forward it is subjected to the action of the high-impact water jet 22. The highly concentrated water particles 54 strike onto the fibers 60 stretching across the meshes 56 of the screen 10.
With the wires 62 of the screen 10 acting in opposite direction of the water particles 54, the fibers 60 of the bulk of wastepaper 58 are de-bonded and liberated either individually or in bundles, or in flakes. Under the mechanical 20 force of the high-impact water jet 22, the partially de-fiberized wastepaper passes through the meshes 56 of the coarse screen 10 and onto the revolving finer screen 12, while larger bundles of fibers will be further de-fiberized by the high-pressure washing jet 24 and forced through the meshes 56 of the coarse screen 10. The fully liberated fibers and the partially de-fiberized 25 wastepaper (or fiber bundles) deposited onto the finer screen 12 are subjected to the action of the high-pressure washing jet 26. These de-fiberization and washing actions are repeated on screens of finer mesh sizes 14, 16. The ~ ~ ~ 1 3 ~ 3 Z
accept of pulp fibers is doctored off by means of the intermediate-pressure washing jet 32 and collected by the accept collector 46. Any large contaminants that cannot be broken down by the high-impact water jet 22 and the high-pressure washing jets 24, 26, 28 are removed by the intermediate-s pressure washing jets 34, 36, 38 and collected by the respective rejectcollectors 48, 50, 52. The fine ink particles are received by the white water collectors 40, 42, 44.
A feature of the apparatus combination 2 of this invention is its ability to disintegrate a bulk of wastepaper into individual fibers suitable for o manufacturing new paper products and remove the cont~min~nts from the usable fibers.
Although only a single embodiment of the present invention has been described and illustrated, the present invention is not limited to the feature of this embodiment, but includes all variations and modifications within the scope of the claims.
Claims (11)
1. A process for mechanically de-fiberizing a bulk of wastepaper which comprises:
(a) submitting waste papers or any paper products to a motorized feeding conveyor which transfers said material onto a revolving endless coarse screen constituting the top-most screen of a series of at least three or more superimposed endless screens with decreasing mesh size, (b) subjecting the waste papers on the endless coarse screen to high-impact water jets, two or more in number and applied only to top side of the uppermost endless coarse screen, located at a distance immediately after the depositon of waste paper on the coarse screen, close to the feeding conveyor, for successive disintegration and separation of fibers from contaminants through said series of superimposed endless screens having successively finer mesh sizes, and at the same time subjecting fibrous mass on each said screens to one or more high-pressure water jets applied to the top side of each of the superimposed endless screens, to further disintegrate the fibrous mass into individual fibers and separate them from larger contaminants;
(c) removing from each screen, except the finest screen, fibrous particles and contaminants not passing through that screen and recovering said materials for reprocessing and/or for disposal, (d) collecting disintegrated individual fibers remained on the finest screen for papermaking;
(e) recovering white water passing through said screens.
(a) submitting waste papers or any paper products to a motorized feeding conveyor which transfers said material onto a revolving endless coarse screen constituting the top-most screen of a series of at least three or more superimposed endless screens with decreasing mesh size, (b) subjecting the waste papers on the endless coarse screen to high-impact water jets, two or more in number and applied only to top side of the uppermost endless coarse screen, located at a distance immediately after the depositon of waste paper on the coarse screen, close to the feeding conveyor, for successive disintegration and separation of fibers from contaminants through said series of superimposed endless screens having successively finer mesh sizes, and at the same time subjecting fibrous mass on each said screens to one or more high-pressure water jets applied to the top side of each of the superimposed endless screens, to further disintegrate the fibrous mass into individual fibers and separate them from larger contaminants;
(c) removing from each screen, except the finest screen, fibrous particles and contaminants not passing through that screen and recovering said materials for reprocessing and/or for disposal, (d) collecting disintegrated individual fibers remained on the finest screen for papermaking;
(e) recovering white water passing through said screens.
2. The process combination of claim 1, wherein the conveyor for feeding waste paper onto the coarse screen is located, slightly above an upper part of the endless coarse screen, at a feeding end of said process combination, revolves in the same direction as the superimposed endless-screens, and has means to control its revolving speed.
3. The process combination of claim 1, wherein the superimposed endless-screens composing of at least three or more screens of different mesh sizes ranging from coarse to fine, all revolving in the same direction, are configuredwith screens having smaller mesh sizes located below an upper part but above a lower part of screens of larger mesh sizes, with a coarsest screen enclosing screens of smaller mesh sizes and with the finest screen in the central positionof said combination.
4. The process combination of claim 3, wherein said screen sizes range from 2 meshes for the coarse screen and 200 meshes for the fine screen, and intermediate screens are those having a mesh size in between.
5. The process combination of claim 1, wherein the endless-screens are supported and revolved by means of motorized rolls which have means for controlling their revolving speeds.
6. The process combination of claim 1, wherein the high-impact water jets, two or more in number and applied only to the uppermost endless coarse screen, are located at a distance immediately after the deposition point of waste paper on the coarse screen which is the top-most screen of the series of superimposed endless screens, near the feeding end of said combination and above the upper part of said coarsest screen, and have a pressure ranging from 1 to 5000 psi.
7. The process combination of claim 1, wherein high-pressure washing jets, two or more in number and applied to each screen of the superimposed system, are located successively away from the feeding end of said combination, above upper part of each screen of the superimposed screens having mesh sizes ranging from coarse to fine, and have a pressure ranging from 1 to 3000 psi.
8. The process combination of claim 1, wherein intermediate-pressure washing jets are located opposite to the feeding end of said combination, above lower parts of said superimposed screens, but not directly under said high-pressure washing jets, and have a pressure ranging from 1 to 2000 psi.
9. The process combination of claim 1, wherein white water passing through the screens of intermediate and fine mesh sizes is collected using collectors which are installed successively away from the feeding end of said combination, underneath the upper parts of said superimposed screens of intermediate and fine mesh sizes, but not directly under said high-pressure washing jets located above the upper parts of said superimposed screens, except for the white water collector underneath the upper part of the finest screen where a white water collector is extended to cover the area under said high-pressure washing jet located above the upper part of said finest screen, and which are capable of removing liquid from said screens and discharge the same.
10. The process combination of claim 1, wherein disintegrated fibers remained on the finest screen are removed from the screen using a washing jet of intermediate pressure and collected in an accept collector which is located opposite to the feeding end, directly under an intermediate-pressure washing jet located above the lower part of said finest screen, and below the lower part of said finest screen, and which has means to receive fibrous material and liquid and to discharge the same.
11. The process combination of claim 1, wherein the un-disintegrated fibrous particles and contaminants are removed from screens of coarse and intermediate mesh sizes by means of intermediate-pressure washing jets located opposite to the feeding end of said combination, above lower parts of said screens of intermediate and coarse mesh sizes, and are collected by reject collectors which are located directly under said washing jets and below the lower parts of said screens, and which have means to receive rejected material and liquid, and discharge the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2113737 CA2113737C (en) | 1994-01-19 | 1994-01-19 | Method and device for processing wastepaper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2113737 CA2113737C (en) | 1994-01-19 | 1994-01-19 | Method and device for processing wastepaper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2113737A1 CA2113737A1 (en) | 1995-07-20 |
| CA2113737C true CA2113737C (en) | 1998-01-06 |
Family
ID=4152765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2113737 Expired - Fee Related CA2113737C (en) | 1994-01-19 | 1994-01-19 | Method and device for processing wastepaper |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2113737C (en) |
Families Citing this family (1)
| 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 |
-
1994
- 1994-01-19 CA CA 2113737 patent/CA2113737C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2113737A1 (en) | 1995-07-20 |
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