CA2369097A1 - Method and apparatus for recycling gypsum board - Google Patents
Method and apparatus for recycling gypsum board Download PDFInfo
- Publication number
- CA2369097A1 CA2369097A1 CA 2369097 CA2369097A CA2369097A1 CA 2369097 A1 CA2369097 A1 CA 2369097A1 CA 2369097 CA2369097 CA 2369097 CA 2369097 A CA2369097 A CA 2369097A CA 2369097 A1 CA2369097 A1 CA 2369097A1
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- CA
- Canada
- Prior art keywords
- gypsum
- paper
- rods
- spill
- grate
- 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.)
- Abandoned
Links
- 239000010440 gypsum Substances 0.000 title claims abstract description 112
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004064 recycling Methods 0.000 title claims abstract description 10
- 238000010408 sweeping Methods 0.000 claims abstract description 6
- 230000003993 interaction Effects 0.000 claims abstract description 3
- 241001417527 Pempheridae Species 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 238000012216 screening Methods 0.000 claims description 6
- 239000000123 paper Substances 0.000 description 45
- 239000000463 material Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 206010017577 Gait disturbance Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011101 paper laminate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
- B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
- B03B9/065—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial the refuse being building rubble
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/12—Apparatus having only parallel elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/22—Revolving drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/16—Feed or discharge arrangements
-
- 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- 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
- Y02W30/58—Construction or demolition [C&D] waste
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A method of recycling gypsum board having paper backing which includes compressing the gypsum board sufficiently to shatter the gypsum and separate, at least partially, the paper backing, collecting the compressed gypsum board on a spill grate having a plurality of spaced apart rods, sweeping the collected gypsum board with a plurality of spaced apart bars passing between rods of the spill grate so that the paper and gypsum are swept down between the rods. The spacing of the rods is such that there is sufficient interaction with the gypsum board to loosen the gypsum from the paper backing, and separate the gypsum from the paper.
Description
CA 02369097 2002-O1-17 _ METHOD AND APPARATUS FOR RECYCLING GYPSUM BOARD
FIELD
The present invention relates to a method and apparatus for recycling gypsum board by separating the gypsum from the paper backing.
BACKGROUND
Gypsum board is supplied in the form of large rectangular sheets having a paper backing bonded tightly to the gypsum board. A major stumbling block in the recycling of this material has been due to the difficulty of separating the paper from the gypsum board. One method disclosed in U.S. Patent No.
5,593,096 issued to Harker et al. consists of passing the board through a hammer mill which pounds the material against a hammer mill grate having holes through which the gypsum board particles and paper pass. Subsequent screening is designed to separate the paper from the separated gypsum board particles.
However, the screened gypsum particles contain a considerable amount of paper, which contaminates the recycled gypsum.
Estimates are that only 65~ of the paper is removed using this method.
U.S. Patent No. 5,304,276 issued to MacLeod et al.
discloses the use of a pair of spaced apart counter rotating rollers having an aperture slightly less than the gypsum board thickness. The rollers fracture the gypsum and paper laminate CA 02369097 2002-O1-17 _ . .. ...... . . . . . _ . .............__ .
.., and tend to cause separation of the paper from the gypsum board. Problems with warpage or bowing of the center of the rollers requires the use of reinforcing rollers on the side remote from the compression side and relatively large diameter rollers. The efficiency of separation of paper from gypsum is dependent on roller wear, aperture size and roller stability and, therefore, tends to be inconsistent. Secondly, there is usually a considerable amount of gypsum still bonded to the paper. Consequently, there is a need for a consistent, IO reliable and efficient method and apparatus for separating gypsum board from its paper backing.
Accordingly, it is an object of the present invention to provide an improved method and apparatus for recycling gypsum board.
SUN~A,RY OF THE INVENTION
According to the invention there is provided a method of recycling gypsum board having paper backing which includes compressing the gypsum board sufficiently to shatter the gypsum and separate, at least partially, the paper backing, collecting the compressed gypsum board on a spill grate having a plurality of spaced apart rods, sweeping the collected gypsum board with a plurality of spaced apart bars passing between rods of the spill grate so that the paper and gypsum are swept down between the rods. The spacing of the rods is such that there is sufficient interaction with the gypsum board to loosen the i gypsum from the paper backing, and separate the gypsum from the paper.
Preferably, the compressing step comprises passing gypsum board between two counter rotating drums spaced apart a distance less than a thickness of said gypsum board.
The rods of the spill grate may, advantageously, be parallel.
The separating step may include screening the gypsum and paper after the sweeping step.
After the separating step the gypsum may be tumbled to break it down into small particles.
Also after the separating step the paper may be further compressed to loosen the remaining gypsum still bonded to the paper.
The method may further include tumbling and screening the paper after the further compressing step to break down the gypsum into small particles and screen it out from the paper.
The further compressing step may include passing the paper through a pair of counter rotating rollers spaced apart a distance so that the gypsum still bonded to the paper is crushed and separates from the paper.
In another aspect of the invention there is provided apparatus for recycling gypsum board which comprises a cutter operative to cut gypsum board into smaller pieces, a compressor operative to compress said pieces of gypsum board sufficiently to shatter the gypsum board and loosen much of it from the backing paper, a spill grate having a plurality of elongated spaced apart rods positioned below said compressor to collect the pieces of gypsum board after being compressed, a rotatable sweeper having a plurality of sweeper bars positioned to pass repeatedly between the spill grate rods and contact the pieces of gypsum board laying thereon and pull them down through the spill grate rods, and a separator operative to separate loose gypsum from the backing paper of the gypsum board.
The compressor may be a pair. of counter rotating drums spaced apart a distance less than the width of gypsum board so as to shatter the gypsum and at least partially separate the paper from the gypsum.
The spill grate rods may be level, parallel and spaced apart a width in the range of 3 to 5 inches. The diameter of the rods may be 1/Z inch. Preferably, the spill grate rods may be level, parallel and 4 inches apart.
The sweeper may have a shaft and a plurality of bars extending radially outwardly therefrom spaced apart the same width as the spill grate rods.
FIELD
The present invention relates to a method and apparatus for recycling gypsum board by separating the gypsum from the paper backing.
BACKGROUND
Gypsum board is supplied in the form of large rectangular sheets having a paper backing bonded tightly to the gypsum board. A major stumbling block in the recycling of this material has been due to the difficulty of separating the paper from the gypsum board. One method disclosed in U.S. Patent No.
5,593,096 issued to Harker et al. consists of passing the board through a hammer mill which pounds the material against a hammer mill grate having holes through which the gypsum board particles and paper pass. Subsequent screening is designed to separate the paper from the separated gypsum board particles.
However, the screened gypsum particles contain a considerable amount of paper, which contaminates the recycled gypsum.
Estimates are that only 65~ of the paper is removed using this method.
U.S. Patent No. 5,304,276 issued to MacLeod et al.
discloses the use of a pair of spaced apart counter rotating rollers having an aperture slightly less than the gypsum board thickness. The rollers fracture the gypsum and paper laminate CA 02369097 2002-O1-17 _ . .. ...... . . . . . _ . .............__ .
.., and tend to cause separation of the paper from the gypsum board. Problems with warpage or bowing of the center of the rollers requires the use of reinforcing rollers on the side remote from the compression side and relatively large diameter rollers. The efficiency of separation of paper from gypsum is dependent on roller wear, aperture size and roller stability and, therefore, tends to be inconsistent. Secondly, there is usually a considerable amount of gypsum still bonded to the paper. Consequently, there is a need for a consistent, IO reliable and efficient method and apparatus for separating gypsum board from its paper backing.
Accordingly, it is an object of the present invention to provide an improved method and apparatus for recycling gypsum board.
SUN~A,RY OF THE INVENTION
According to the invention there is provided a method of recycling gypsum board having paper backing which includes compressing the gypsum board sufficiently to shatter the gypsum and separate, at least partially, the paper backing, collecting the compressed gypsum board on a spill grate having a plurality of spaced apart rods, sweeping the collected gypsum board with a plurality of spaced apart bars passing between rods of the spill grate so that the paper and gypsum are swept down between the rods. The spacing of the rods is such that there is sufficient interaction with the gypsum board to loosen the i gypsum from the paper backing, and separate the gypsum from the paper.
Preferably, the compressing step comprises passing gypsum board between two counter rotating drums spaced apart a distance less than a thickness of said gypsum board.
The rods of the spill grate may, advantageously, be parallel.
The separating step may include screening the gypsum and paper after the sweeping step.
After the separating step the gypsum may be tumbled to break it down into small particles.
Also after the separating step the paper may be further compressed to loosen the remaining gypsum still bonded to the paper.
The method may further include tumbling and screening the paper after the further compressing step to break down the gypsum into small particles and screen it out from the paper.
The further compressing step may include passing the paper through a pair of counter rotating rollers spaced apart a distance so that the gypsum still bonded to the paper is crushed and separates from the paper.
In another aspect of the invention there is provided apparatus for recycling gypsum board which comprises a cutter operative to cut gypsum board into smaller pieces, a compressor operative to compress said pieces of gypsum board sufficiently to shatter the gypsum board and loosen much of it from the backing paper, a spill grate having a plurality of elongated spaced apart rods positioned below said compressor to collect the pieces of gypsum board after being compressed, a rotatable sweeper having a plurality of sweeper bars positioned to pass repeatedly between the spill grate rods and contact the pieces of gypsum board laying thereon and pull them down through the spill grate rods, and a separator operative to separate loose gypsum from the backing paper of the gypsum board.
The compressor may be a pair. of counter rotating drums spaced apart a distance less than the width of gypsum board so as to shatter the gypsum and at least partially separate the paper from the gypsum.
The spill grate rods may be level, parallel and spaced apart a width in the range of 3 to 5 inches. The diameter of the rods may be 1/Z inch. Preferably, the spill grate rods may be level, parallel and 4 inches apart.
The sweeper may have a shaft and a plurality of bars extending radially outwardly therefrom spaced apart the same width as the spill grate rods.
5 A shaker tray may be located below the spill grate operative to receive gypsum and paper from the spill grate and screen out small particles of gypsum.
A first tumbling cylinder may be operative o receive gypsum from the separator and break it down into small particles.
A pair of counter rotating rollers may be operative to crush any gypsum still bonded to the backing paper received from the shaker tray.
A spill grate having a plurality of level rods spaced apart a distance in the range of 3 to 5 inches with a rotatable sweeper having bars spaced apart the same distance as the rods and passing between said rods to contact the gypsum and backing paper may be used.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages will be apparent from the following detailed description, given by way of example, of a preferred embodiment taken in conjunction with the accompanying drawings, wherein:
i Fig. 1 is a schematic diagram of the apparatus and process;
Fig. 2 is a side sectional view of the cutter;
Fig. 3 is a plan view of the cutter used to cut the gypsum board into squares;
Fig. 4 is schematic diagram showing the counter rotating cylinders, spill grate, sweeper and the screening assembly;
Fig. 5 is a front elevation view of the sweeper bars;
Fig. 6 is a side elevation view of the tumbler cylinder with input and output conveyers;
Fig. 7 is an end view of the tumbler with rubber rollers and baffles;
Fig. 8 is a side elevation view of the infeed conveyer, counter rotating cylinders, spill grate and sweeper rods;
Fig. 9 is a side elevation view of the tumbling cylinder used for the paper; and Fig. 10 is an end view of the tumbling cylinder with rubber rollers and baffles.
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
In the following discussion, like reference numbers refer to like parts.
Referring to Fig. 1, the system has an input conveyor 13 which directs materials placed thereon to a roller/cutter 10. As seen in Fig. 2 the roller cutter is made up of a pair of counter rotating cylinders 26 and 28 having surfaces formed by squares of cutting edges 31 (see Fig. 3) which mate as rotation of both cylinders 26 and 28 take place. The output of the roller/cutter 10 is positioned to deposit material output onto a conveyor 11 while conveyor 11 transports material placed thereon to a crusher/separator 12. Particle output conveyor 18 runs from an output of crusherlseparator 12 to a tumbling cylinder 20 and paper output goes to another crusher/separator 14 via conveyor 15. The paper and gypsum output of crusher/separator 14 goes to conveyor 16. Conveyor 16 goes to an input of tumbling cylinder 22 and the output 23 goes to a standard one ton bailer 25_ From output 23 conveyor 24 returns any gypsum particles left to conveyor 17.
F
g Referring to Figs. 2 and 3, roller/cutter 10 consists of two counter rotating cylinders 26 and 28 over the surfaces of which are cutting edges 31 formed into 1' squares. The cutting edges 31 on each of cylinders 26 and 28 abut when the two cylinders rotate to their point of closest approach.
Referring to Figs. 4 and 5, the output of conveyor 11 is proximate an infeed ramp 33 which is inclined toward a pair of counter rotating rollers 27 and 29. The spacing between the counter rotating rollers 27 and 29 is set to have an aperture slightly less than the thickness of gypsum board being processed. The output side of the rollers 27 and 29 is above a level spill grate 35 which consists of a plurality of parallel inch diameter rods spaced 4 inches apart. A separation in the range of 3 to 5 inches would be.acceptable. Below the spill grate 35 there is mounted on a shaft 40, which is aligned parallel to the plane of the spill grate 35, rows of radially spaced apart sweeper bas 38 rigidly mounted to shaft 40. Shaft 40 is rotated so that sweeper bars 38 pass between the rods of spill grate 35. Below the spill grate is located a shaker tray 34 having a screen. Below the shaker tray there is located outfeed conveyor 18.
Referring to Figs. 6 and 7 tumbling cylinder 20 has an input end proximate and output end of outfeed conveyor 18 and has its axis inclined downwardly from the latter. Tumbling .., .. 9 cylinder 20 is supported by rubber rollers 42. The interior of tumbling cylinder 20 has four equally spaced apart 6 inch baffles extending radially inwardly towards the axis of rotation of the tumbling cylinder 20.
Referring to Fig. 8 crusher/separator 14 is identical to that of crusher/separator 12 except that the crusher/separator l4 has only conveyor 16 and no shaker tray and rollers 27 and 29 are spaced apart less than those of Fig.
4 .
Referring to Figs. 9 and 10 the tumbling cylinder 22 is identical to the tumbling cylinder 20 except that conveyor 16 feeds the former rather than conveyor 18 and a hexagonal screen 50 abuts the interior walls of cylinder 22. The paper output 23 of tumbler 22 goes to a one ton baler 25.
In operation gypsum board is fed onto input conveyor 13 where it is cut into one foot squares by combination roller/cutter 10. The squares travel along conveyor 11, which carries the squares to a ramp 33. The ramp 33 directs the squares to a crusher/separator 12 where the squares are compressed by the pair of counter rotating rollers 27 and 29 (see Fig. 4~. Most of the gypsum is shattered into powder and becomes separated from the paper backing of the squares of gypsum board. The gypsum, paper, gypsum and pieces of gypsum still bonded to paper fall from the rollers 27 and 29 onto the level spill grate 35 with the powder continuing on to the shaker tray feeds conveyor 15 and through to the outfeed conveyor 18. Paper and paper with pieces of gypsum attached 5 are contacted by the sweeper bars 38 and are pulled through the rods of the spill gate 35. The gentle sweeping action of the bars through the rods of the spill grate 35 causes almost a complete separation of the gypsum previously still attached to the paper after compression by rollers 27 and 29 without 10 damaging the paper.
The gypsum carried by conveyor 18 goes into tumbling cylinder 20 which breaks up the larger pieces of gypsum and produces small particles. Pieces of gypsum, which remain bonded to the paper, and paper without gypsum are carried by shaker tray feeds conveyor 15 to a second crusher/separator 14 where they undergo a further compression by rollers 27 and 29.
The paper and gypsum is deposited on conveyor 16 and carried to tumbling cylinder 22. The output from tumbling cylinder 22 within the hexagonal screen'50 is paper, which is carried to a one ton baler 25. The output between hexagonal screen 50 and the interior surface of tumbling cylinder 22 is recovered gypsum, which is transported by conveyor 24 back to conveyor 17 .
1l Accordingly, while this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description, It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.
A first tumbling cylinder may be operative o receive gypsum from the separator and break it down into small particles.
A pair of counter rotating rollers may be operative to crush any gypsum still bonded to the backing paper received from the shaker tray.
A spill grate having a plurality of level rods spaced apart a distance in the range of 3 to 5 inches with a rotatable sweeper having bars spaced apart the same distance as the rods and passing between said rods to contact the gypsum and backing paper may be used.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages will be apparent from the following detailed description, given by way of example, of a preferred embodiment taken in conjunction with the accompanying drawings, wherein:
i Fig. 1 is a schematic diagram of the apparatus and process;
Fig. 2 is a side sectional view of the cutter;
Fig. 3 is a plan view of the cutter used to cut the gypsum board into squares;
Fig. 4 is schematic diagram showing the counter rotating cylinders, spill grate, sweeper and the screening assembly;
Fig. 5 is a front elevation view of the sweeper bars;
Fig. 6 is a side elevation view of the tumbler cylinder with input and output conveyers;
Fig. 7 is an end view of the tumbler with rubber rollers and baffles;
Fig. 8 is a side elevation view of the infeed conveyer, counter rotating cylinders, spill grate and sweeper rods;
Fig. 9 is a side elevation view of the tumbling cylinder used for the paper; and Fig. 10 is an end view of the tumbling cylinder with rubber rollers and baffles.
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
In the following discussion, like reference numbers refer to like parts.
Referring to Fig. 1, the system has an input conveyor 13 which directs materials placed thereon to a roller/cutter 10. As seen in Fig. 2 the roller cutter is made up of a pair of counter rotating cylinders 26 and 28 having surfaces formed by squares of cutting edges 31 (see Fig. 3) which mate as rotation of both cylinders 26 and 28 take place. The output of the roller/cutter 10 is positioned to deposit material output onto a conveyor 11 while conveyor 11 transports material placed thereon to a crusher/separator 12. Particle output conveyor 18 runs from an output of crusherlseparator 12 to a tumbling cylinder 20 and paper output goes to another crusher/separator 14 via conveyor 15. The paper and gypsum output of crusher/separator 14 goes to conveyor 16. Conveyor 16 goes to an input of tumbling cylinder 22 and the output 23 goes to a standard one ton bailer 25_ From output 23 conveyor 24 returns any gypsum particles left to conveyor 17.
F
g Referring to Figs. 2 and 3, roller/cutter 10 consists of two counter rotating cylinders 26 and 28 over the surfaces of which are cutting edges 31 formed into 1' squares. The cutting edges 31 on each of cylinders 26 and 28 abut when the two cylinders rotate to their point of closest approach.
Referring to Figs. 4 and 5, the output of conveyor 11 is proximate an infeed ramp 33 which is inclined toward a pair of counter rotating rollers 27 and 29. The spacing between the counter rotating rollers 27 and 29 is set to have an aperture slightly less than the thickness of gypsum board being processed. The output side of the rollers 27 and 29 is above a level spill grate 35 which consists of a plurality of parallel inch diameter rods spaced 4 inches apart. A separation in the range of 3 to 5 inches would be.acceptable. Below the spill grate 35 there is mounted on a shaft 40, which is aligned parallel to the plane of the spill grate 35, rows of radially spaced apart sweeper bas 38 rigidly mounted to shaft 40. Shaft 40 is rotated so that sweeper bars 38 pass between the rods of spill grate 35. Below the spill grate is located a shaker tray 34 having a screen. Below the shaker tray there is located outfeed conveyor 18.
Referring to Figs. 6 and 7 tumbling cylinder 20 has an input end proximate and output end of outfeed conveyor 18 and has its axis inclined downwardly from the latter. Tumbling .., .. 9 cylinder 20 is supported by rubber rollers 42. The interior of tumbling cylinder 20 has four equally spaced apart 6 inch baffles extending radially inwardly towards the axis of rotation of the tumbling cylinder 20.
Referring to Fig. 8 crusher/separator 14 is identical to that of crusher/separator 12 except that the crusher/separator l4 has only conveyor 16 and no shaker tray and rollers 27 and 29 are spaced apart less than those of Fig.
4 .
Referring to Figs. 9 and 10 the tumbling cylinder 22 is identical to the tumbling cylinder 20 except that conveyor 16 feeds the former rather than conveyor 18 and a hexagonal screen 50 abuts the interior walls of cylinder 22. The paper output 23 of tumbler 22 goes to a one ton baler 25.
In operation gypsum board is fed onto input conveyor 13 where it is cut into one foot squares by combination roller/cutter 10. The squares travel along conveyor 11, which carries the squares to a ramp 33. The ramp 33 directs the squares to a crusher/separator 12 where the squares are compressed by the pair of counter rotating rollers 27 and 29 (see Fig. 4~. Most of the gypsum is shattered into powder and becomes separated from the paper backing of the squares of gypsum board. The gypsum, paper, gypsum and pieces of gypsum still bonded to paper fall from the rollers 27 and 29 onto the level spill grate 35 with the powder continuing on to the shaker tray feeds conveyor 15 and through to the outfeed conveyor 18. Paper and paper with pieces of gypsum attached 5 are contacted by the sweeper bars 38 and are pulled through the rods of the spill gate 35. The gentle sweeping action of the bars through the rods of the spill grate 35 causes almost a complete separation of the gypsum previously still attached to the paper after compression by rollers 27 and 29 without 10 damaging the paper.
The gypsum carried by conveyor 18 goes into tumbling cylinder 20 which breaks up the larger pieces of gypsum and produces small particles. Pieces of gypsum, which remain bonded to the paper, and paper without gypsum are carried by shaker tray feeds conveyor 15 to a second crusher/separator 14 where they undergo a further compression by rollers 27 and 29.
The paper and gypsum is deposited on conveyor 16 and carried to tumbling cylinder 22. The output from tumbling cylinder 22 within the hexagonal screen'50 is paper, which is carried to a one ton baler 25. The output between hexagonal screen 50 and the interior surface of tumbling cylinder 22 is recovered gypsum, which is transported by conveyor 24 back to conveyor 17 .
1l Accordingly, while this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description, It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.
Claims (21)
1. A method of recycling gypsum board having paper backing, comprising:
(a) compressing the gypsum board sufficiently to shatter the gypsum and separate, at least partially, the paper backing;
(b) collecting the compressed gypsum board on a spill grate having a plurality of spaced apart rods;
(c) sweeping the collected gypsum board with a plurality of spaced apart bars passing between rods of the spill grate so that the paper and gypsum are swept down between the rods the spacing of the rods being such that there is sufficient interaction with the gypsum board to loosen the gypsum from the paper backing; and {d) separating the gypsum from the paper.
(a) compressing the gypsum board sufficiently to shatter the gypsum and separate, at least partially, the paper backing;
(b) collecting the compressed gypsum board on a spill grate having a plurality of spaced apart rods;
(c) sweeping the collected gypsum board with a plurality of spaced apart bars passing between rods of the spill grate so that the paper and gypsum are swept down between the rods the spacing of the rods being such that there is sufficient interaction with the gypsum board to loosen the gypsum from the paper backing; and {d) separating the gypsum from the paper.
2. A method according to claim 1, wherein said compressing step comprises passing gypsum board between two counter rotating drums spaced apart a distance less than a thickness of said gypsum board.
3. A method according to claim 1, wherein the rods of said spill grate are parallel.
4. A method according to claim 1, wherein said separating step includes screening the gypsum and paper after said sweeping step.
5. A method according to claim 1, including tumbling said gypsum after said separating step to break it down into small particles.
6. A method according to claim 1, including further compressing the paper after said separating step to loosen remaining gypsum still bonded to said paper.
7. A method according to claim 6, tumbling and screening said paper after said further compressing step to break down the gypsum into small particles and screen it out from the paper.
8. A method according to claim 6, wherein said further compressing step includes passing the paper through a pair of counter rotating rollers spaced apart a distance so that the gypsum still bonded to the paper is crushed and separates from the paper.
9. Apparatus for recycling gypsum board, comprising:
(a) a cutter operative to cut gypsum board into smaller pieces;
(b) a compressor operative to compress said pieces of gypsum board sufficiently to shatter the gypsum board and loosen much of it from the backing paper;
(c) a spill grate having a plurality of elongated spaced apart rods positioned below said compressor to collect the pieces of gypsum board after being compressed;
(d) a rotatable sweeper having a plurality of sweeper bars positioned to pass repeatedly between said spill grate rods and contact the pieces of gypsum board laying thereon and pull them down through the spill grate rods; and (e) a separator operative to separate loose gypsum from the backing paper of the gypsum board.
(a) a cutter operative to cut gypsum board into smaller pieces;
(b) a compressor operative to compress said pieces of gypsum board sufficiently to shatter the gypsum board and loosen much of it from the backing paper;
(c) a spill grate having a plurality of elongated spaced apart rods positioned below said compressor to collect the pieces of gypsum board after being compressed;
(d) a rotatable sweeper having a plurality of sweeper bars positioned to pass repeatedly between said spill grate rods and contact the pieces of gypsum board laying thereon and pull them down through the spill grate rods; and (e) a separator operative to separate loose gypsum from the backing paper of the gypsum board.
10. Apparatus according to claim 9, wherein said compressor is a pair of counter rotating drums spaced apart a distance less than the width of gypsum board so as to shatter the gypsum and at least partially separate the paper from the gypsum.
11. Apparatus according to claim 9, wherein the spill grate rods are level, parallel and spaced apart a width in the range of 3 to 5 inches.
12. Apparatus according to claim 11, wherein the diameter o f the rods is 1/2 inch.
13. Apparatus according to claim 9, wherein the spill grate rods are level, parallel and 4 inches apart.
14. Apparatus according to claim 13, wherein the diameter of the rods is 1/2 inch.
15. Apparatus according to claim 9, wherein the sweeper has a shaft and a plurality of bars extending radially outwardly therefrom spaced apart the same width as said spill grate rods.
16. Apparatus according to claim 9, including a shaker tray located below said spill grate operative to receive gypsum and paper from said spill grate and screen out small particles of gypsum.
17. Apparatus according to claim 9, including a first tumbling cylinder operative to receive gypsum from said separator and break it down into small particles.
18. Apparatus according to claim 16, including a pair of counter rotating rollers operative to crush any gypsum still bonded to the backing paper received from said shaker tray.
19. Apparatus according to claim 18, including a spill grate having a plurality of level rods spaced apart a distance in the range of 3 to 5 inches and a rotatable sweeper having bars spaced apart the same distance as said rods and passing between said rods to contact the gypsum and backing paper.
20. Apparatus according to claim 18, including a spill grate having a plurality of level, parallel rods spaced apart a distance of 4 inches and a rotatable sweeper having bars spaced apart the same distance as said rods and passing between said rods to contact the gypsum and backing paper.
21. Apparatus according to claim 19, including a tumbling cylinder having an internal screen operative to screen out gypsum and to break down the gypsum into small particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2369097 CA2369097A1 (en) | 2002-01-17 | 2002-01-17 | Method and apparatus for recycling gypsum board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2369097 CA2369097A1 (en) | 2002-01-17 | 2002-01-17 | Method and apparatus for recycling gypsum board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2369097A1 true CA2369097A1 (en) | 2003-07-17 |
Family
ID=27587728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2369097 Abandoned CA2369097A1 (en) | 2002-01-17 | 2002-01-17 | Method and apparatus for recycling gypsum board |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2369097A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK201470442A1 (en) * | 2014-07-14 | 2016-01-25 | Gips Recycling Danmark As | Purification unit |
| CN106824482A (en) * | 2017-03-27 | 2017-06-13 | 从江县胜达活性炭有限公司 | A kind of feed arrangement of Activated Carbon Production |
| CN112403631A (en) * | 2020-10-28 | 2021-02-26 | 衡阳圣堂科技有限公司 | Palm type recording device for customer information |
| CN114011525A (en) * | 2021-11-08 | 2022-02-08 | 江苏脒诺甫纳米材料有限公司 | Zirconium silicate ball-milling process and ball-milling device thereof |
| CN114308339A (en) * | 2021-12-27 | 2022-04-12 | 安徽省正大源饲料集团有限公司 | Improve birds poultry immunity's fodder and smash mixing arrangement |
| CN115254578A (en) * | 2022-09-05 | 2022-11-01 | 扬州嘉明环保科技有限公司 | Screening device for mineral raw materials |
| CN115283232A (en) * | 2022-07-14 | 2022-11-04 | 四川大地山河环保工程有限责任公司 | Screening installation based on former well drilling is left over solid useless preparation haydite |
| CN115301378A (en) * | 2022-07-30 | 2022-11-08 | 河南多赛环保设备有限公司 | Even non-impurity processing equipment of fodder for livestock breeding |
-
2002
- 2002-01-17 CA CA 2369097 patent/CA2369097A1/en not_active Abandoned
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK201470442A1 (en) * | 2014-07-14 | 2016-01-25 | Gips Recycling Danmark As | Purification unit |
| CN106824482A (en) * | 2017-03-27 | 2017-06-13 | 从江县胜达活性炭有限公司 | A kind of feed arrangement of Activated Carbon Production |
| CN112403631A (en) * | 2020-10-28 | 2021-02-26 | 衡阳圣堂科技有限公司 | Palm type recording device for customer information |
| CN114011525A (en) * | 2021-11-08 | 2022-02-08 | 江苏脒诺甫纳米材料有限公司 | Zirconium silicate ball-milling process and ball-milling device thereof |
| CN114308339A (en) * | 2021-12-27 | 2022-04-12 | 安徽省正大源饲料集团有限公司 | Improve birds poultry immunity's fodder and smash mixing arrangement |
| CN115283232A (en) * | 2022-07-14 | 2022-11-04 | 四川大地山河环保工程有限责任公司 | Screening installation based on former well drilling is left over solid useless preparation haydite |
| CN115283232B (en) * | 2022-07-14 | 2023-07-04 | 四川大地山河环保工程有限责任公司 | Screening installation based on former drilling remains solid useless preparation haydite |
| CN115301378A (en) * | 2022-07-30 | 2022-11-08 | 河南多赛环保设备有限公司 | Even non-impurity processing equipment of fodder for livestock breeding |
| CN115254578A (en) * | 2022-09-05 | 2022-11-01 | 扬州嘉明环保科技有限公司 | Screening device for mineral raw materials |
| CN115254578B (en) * | 2022-09-05 | 2024-03-15 | 扬州嘉明环保科技有限公司 | Mineral raw material screening device |
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