CA1068959A - Apparatus for pulping and grading waste material - Google Patents
Apparatus for pulping and grading waste materialInfo
- Publication number
- CA1068959A CA1068959A CA288,698A CA288698A CA1068959A CA 1068959 A CA1068959 A CA 1068959A CA 288698 A CA288698 A CA 288698A CA 1068959 A CA1068959 A CA 1068959A
- Authority
- CA
- Canada
- Prior art keywords
- wall
- chamber
- rejects
- impeller
- outlet
- 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
Links
- 238000004537 pulping Methods 0.000 title claims abstract description 19
- 239000002699 waste material Substances 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000010893 paper waste Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000006872 improvement Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 description 2
- SFNPDDSJBGRXLW-UHFFFAOYSA-N (3-methylsulfanylbutan-2-ylideneamino) n-methylcarbamate Chemical compound CNC(=O)ON=C(C)C(C)SC SFNPDDSJBGRXLW-UHFFFAOYSA-N 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 101100333320 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) end-3 gene Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002002 slurry Substances 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
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/0084—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage
- B02C18/0092—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage for waste water or for garbage
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Food Science & Technology (AREA)
- Paper (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Method and apparatus for pulping and grading waste paper in which stock is introduced through a central inlet in one end wall of a cylindrical chamber and accepts are discharged through a perforate screen in the opposite end wall. An impeller in the chamber adjacent the perforate screen provides for pulping and pumping of the stock as well as provides rotational movement of the stock within the chamber. Light rejects are continuously removed through an outlet adjacent the wall containing the per-forate screen while heavy rejects are removed through an outlet adjacent the inlet wall.
The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to to accompanying drawings and the follo-ing detailed description.
Method and apparatus for pulping and grading waste paper in which stock is introduced through a central inlet in one end wall of a cylindrical chamber and accepts are discharged through a perforate screen in the opposite end wall. An impeller in the chamber adjacent the perforate screen provides for pulping and pumping of the stock as well as provides rotational movement of the stock within the chamber. Light rejects are continuously removed through an outlet adjacent the wall containing the per-forate screen while heavy rejects are removed through an outlet adjacent the inlet wall.
The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to to accompanying drawings and the follo-ing detailed description.
Description
~.Q~8 BACKGROUN~ OF ~E INVE~TIO~
~his invention relates to the pulping and gxading of wa~te material and more particularly to the pulping and grading of waste stock intended for use in paper or board making machinesO
In one known apparatus ~or pulping and grading such wa~te material~ the stock to be so pulped and graded is introduced through a tangential inlet to a generally cylindrical chamber~ An ~npeller ~ -generally dispo~ed in an end wall remote from the tangential inlet provides for pulping a~d rotational movement of the stock within ~ ;
the chamber. ACC~p~9 pass through a screen in the wall behind the LmpellerO In an apparatus of ~his general type disclo-~ed in United State~ patent ~. 3~8~4~488 is3ued October 299 lgf4 to J.~.Voith Gmb~, heavy rejects are removed from the chamber through an annular rece~s while light rejects are paDmitted to accumulate in the oentral core o~ the chamber near the wall opposite the impeller~
: Periodically the light rejects are tapped off through an axial out-let i~ the wall oppo~ite the Lmpeller. This apparatus i9 designed under the assumption that such a pulping and grading machine acts in the nature of a vortex separatorO
The rotational movement of the stock within the chamber re ults in large centrifugal force~ and a significant increase in pre~sure near the outer periphery or cylindrical wall~ As a result of the inlet line being located in the outer periphery of the chamber~ a ~ignificantly large pressure head is required to force the stock in~o the chamber for processingO Further~ ~he fact tha~ the exaet rate of accumulation of lightweight rejects adjacent the central portion of the wall opposite tha impeller is not known9 and can vary throughout the operation of the apparatus ~, it is basically guesswork how o~ten and how long the lightweight rejects lB68959 - ~ort should be opened.
~E~ ' ' Applicants have discovered that pulping and grading units of the type generally described above act more in the nature of a low power~ heavy duty defibering screen rather than a vortex separatorO The ~tock is pulped within th0 cha~ber and the accepts pass through the screen behind the impellerO Lightweight rejects tend to concentrate near the radially edge of the wall containing the screenO Heavy rejects follow the flow of the fluid radially outwardly and axially away from the Lmpeller and tend to accumulate along the outer cylindrical wall and adja~ent the end wall oppo~ite the impsllerO The lightweight rejects, therefore~ can be continuous- :
ly tapped off through the cylindrical wall in an area ~ear the end wall containîng the screen w~ile the heavy rejects can be tapped off through an outlet in the cylindrical chamber near the wall opposite the impeller. The inlet line~ therefore~ can be disposed in the wall opposite the impeller and located ~entrally thereofO
Since the inlet line is disposed centrally of the end wall and at axi3 of rotation, the pressure required to force the stock into the appaxatus is reduce~ quite signi~icantly and in some cases to the extent that it ca~ be introduced into the appàratus merely by gravityO
Applica~ts have also discovsred tha quite surpri~ingly, efficiency of removal of waste material increase~ as the inlet ~low increa~es.
It is an object, there~ore9 of the present .invention to provide a pulping and grading system with reduced powsr require-ment~ without s ignif ican~ 103s in pulping and separating e~iiciency.
It i~ a ~urther object of the present invention to provide :
~ 0689~
` method ~or pulping and grading waste materi~l wi~h increased power efficiency~
Other objeets will be in part apparent and in part pointed out more in detail hereinafterO
The invention accordingly consists of the features of con-skruction9 combination of elements and arrangement of part~ which :-will be exemplified by the construction hereinafter set forth and the scope of the inven~ion will be indicated in the appended claLms.
BRIEF DESCRIPT ION OF TH~ DRAWIN~S ~ ~
Figuxe 1 is a ~ide view of an apparatus constructed in ~ .
accordance with the present inventi~n with portion~ broken away;
Figure 2 is a sectional view of the apparatu~ of Figure 1 taken substantially along line 2-2 of Figure 1 with portions broken away;
Figure 3 is a graph illustrating the inlet pressure re-quirements o~ the me~hod and apparatus of the present invention compared to a prior art method and apparatus; and Figure 4 i~ a graph illustrating ths lightweight rejecks removal efficiency of the method and apparatus of the present in-vention compared to a prior art method and ~pparatus.
D~ ~ ME~TS
With refarence to the drawings~ and in ~articular Figures1 and 2~ there is illustrated an apparatus 1 for pulping and grading waste material~ particularly the pulping and yrading of waste paper~
The apparatu~ 1 includes a generally cylindrical chamber ~ defined :;
by a sub~tantially cylindrical wall 3, a first end wall 4 and a second end wall 50 While the chamber is illustrated as being truly ~ylindr.ical wi~h flat end wall~ it will be illu~trated that khe cylindrical wall need not be perfectly cylindrical nor need the end - 3 ~
~_11 be perfectly flatD ~he end walls 4 and 5 may~ for example~
merge with the cylindrical wall 3 through a smooth curve. For purposes o~ describing the location and orientation of the various parts9 an axis 6 extending perpendicularly through the center of both end walls and through the c~nter of the cylindrical chamber will be re~erred to hareinafter as the central axis 6 A generally circular perforate area 7 is located centrally in the first end wall 4. This perforate area provides a screening ` arrangement for permitting accept~ to pass through the end wall 4 and may have holes or perforations of whatever size and shape as is de-sired for most efficient screening of the particular type of stock being used taking into consideration the specific quality and grade of accepts required.
An impeller .8 is disposed within the chamber in a known manner adjacent the perforate area 7 with its xotational axis co- -~
incident with the central axis 6 of the apparatus lo A shaft 9~ which is connected to a source of rota~ional power9 (not illu~trated) ex~
tends through the end wall 4 and is operably connected to the impeller 8 ko impar rotational motion thereto.
In accordance with the present invention~ a supply line or :
pipe lO is connected to an inlet nozzle 11 disposed centrally within the second wall 5O The inlet ~ozzle ll therefore~ has its center coincident with the centxal axis 6 of the chamber 2 and provides for stock to enter the chamber 2 through the second end wall 5 and at a point directly opposite the impeller 8 adjacent the perforate area 70 A light rejects nozzle 12 is located in the apparatus l in an area disposed radially outwardly o~ the per~orate area ~O
More specifically~ the light rejects outlet 12 is located in the cylinclrical wall 3 and next adjacent the ~irst end wall 4O Further9 s best seen in Figure 2, the light reject~ nozzle 12 exits from the cylindrical wall 3 in a direction which i5 tangent to the cylindrical wall 3 and is connected to a light rejscts pipe 13~ Al~
though it i8 not illu~trated it may be de3irable to have a pump connected to the pipe 13 for assisting in transporting light rejects . :
to the next point in the process.
A heavy re~ects outlet 14 is disposed in the cylindrical wall 3 near the second end wall 5. In the specific em~odiment illustrated, the heavy rejects outlet 14 is disposed next adjacent 10 the first wall 5~ This provides the heavy rejects outlet at the point of last migration of heavy particles along the cylindrical wall ~
3 thus avoiding the buildup of heavy rejects adjacent the second wall ;: :
5 which can continue to whirl around the chamber causing excessive weaxO Also~ as best see~ in Figure 29 the heavy rejects outlet extsnd~ in a direction tangent to the cylindrical wall 3 and is connected to a rejects pipe 15.
An accepts chamber 16 is connected to the ~irst wall 4 and encloses the area outside the chamber 2 adjacent the perforate area 7 for receiving accepts paæsing through the perforate area or screell 70 An exit 17 is connected o the accepts chamd~er 16 and in communication with an accepts pipeline 18.
Particularly with reference to Figure 2 in the particular embodiment illustrated, the rotation of the Lmpeller i5 indicated by the arrow 19 0 Thus g it can be ~een that not only are the light rejec~s outlet 12 and heavy rejects outlet 14 disposed in directions tangential to the cylindrical wall 3, but they also are arranged to ~:
extend in the general direction of the rotation of the lmpeller l9o The impeller 19 imparts a pumping a~d whirling motion to the slurry or ~to~k withi~ the chamber~ generally in the direction of the ~ 5 ~
9s9 : rrows 20D æhe stock~ therefore~ enters the inlet line at 11 generally indicated by the arrow 21. The inlet nozzle 11 extends in a direction parallel to the central axis 6 to provide that the stock enters the chamber 2 in a direction along the central axis 6 and toward the L~peller 8. The impeller 8 provides a pulping action and imparts the whirling motion descr~bed above which causss the stock to rotate through the chamber 2 in the direction of the arrow~
20 illustrated in Figure 20 The whirling stock proceeds rearward}y from the ~irst wall 4 toward the second wall 5~ as illustratad by ~:
the arrows 20 in Figure 20 Accepts pa~ through the screen 7 into the accept chambers 16 and subsequently out throu~h the outlet nozzle 17. Fine rejects become concentrated adjacent the first wall 4 and are continuously :~
tapped o$f through the light rejects line 12. Heavy rejects are thrown radially outwardly by centrifugal force and migrate rear-wardly toward the second wall 5 and are rejec$ed through the heavias reject nozzle 14~
The apparatus of the present invention was compar d with a known apparatus with respect to inlet pressure requirements and capabili~y of separating light weight rejects, i.eO, reject~ having a specîfic gravity les~ than 1. The standard apparatus included a generally cylindrical chamber having a first end wall with a per-forate area and an L~peller next adjacent therekoO The second end wall was disposed opposite the first end wall with a light rejects no~zle dispo~ed at the axial csnter thereof. The stock inlet was tangential to tha cylindrical wall and located adjacent the second wall. The 3tandard apparatus9 therefora~ was sub tantially the same as the apparatus of the present invention with the exception that ~he inlet of th~ standard apparatus was locatad in the cyl.in-: : , : ,.
drical wall in a known manner and ~he light rejects outlet was lo~
cated ce~trally in the end wall opposite the Lmpeller in a known manner.
As illustrated in the following table and in Figures 3 and 4J the required inlet pressure for a given accept flow was significantly less fox the apparatus constructed in accordance with the present inventian.
TABLE
GPM AC OE PTS PSI I~hET ~ OF LIGHT WEIG~T
F~ )W PRESSU~ P~3JE~!S PE;MOVAL
Prior Art 200 17 38.4 : :
Separator 300 18u5 32.7 400 18.5 20.0 Separator of 100 7.75 4107Present 205 8.5 34.9 Invention 320 11 4702 400 1~ 37~5 The efficiancy in removing lightweight contaminates or the ,,.: :
: ~ percent of ~ightweight rejects removed9 was ~ignificantly greater with the apparatus constructed in accordance with the present in-vention, partieularly at the higher flow rates. This is particu-larly valuable since heretofore separators of ~he general type ~:
described have decreased in efficiency of removal of lightweight rejects as the accepts flow :rate increasedO The apparatus o~ the present invention, however~ provi~e~ e~sentially no decrease in efficiency of xemoval o~ lightweight rejects as ths accepts flow increases. ~.
It can ba seen9 therefore~ that the present invention provides an apparatus and a method for pulping and separating ::
waste ma~erial which sub~tantially reduce~ the inlet pressure ~ 7 ~
~?613959 required with no signi~icant loss in e~ficiency of removal oflightweiyht rejects and, in fact9 provides improvement in the removal of lightweight rejects at higher flow rates. This psrmits an increase in flow and thus an increase in production and at the ; same time an increase in the rate of removal of lightweight rejects. In additionJ all this is accomplished with a redu~tion of power requirements to get the stock into the pulper/separator and sometimes wi~h the inlet pump eliminated altogether.
While this specific representative embodiment and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various change~ and mo~ifications may be made therein without departing from the spirit or scope of the invention.
~ ' '~' , :, ~
~his invention relates to the pulping and gxading of wa~te material and more particularly to the pulping and grading of waste stock intended for use in paper or board making machinesO
In one known apparatus ~or pulping and grading such wa~te material~ the stock to be so pulped and graded is introduced through a tangential inlet to a generally cylindrical chamber~ An ~npeller ~ -generally dispo~ed in an end wall remote from the tangential inlet provides for pulping a~d rotational movement of the stock within ~ ;
the chamber. ACC~p~9 pass through a screen in the wall behind the LmpellerO In an apparatus of ~his general type disclo-~ed in United State~ patent ~. 3~8~4~488 is3ued October 299 lgf4 to J.~.Voith Gmb~, heavy rejects are removed from the chamber through an annular rece~s while light rejects are paDmitted to accumulate in the oentral core o~ the chamber near the wall opposite the impeller~
: Periodically the light rejects are tapped off through an axial out-let i~ the wall oppo~ite the Lmpeller. This apparatus i9 designed under the assumption that such a pulping and grading machine acts in the nature of a vortex separatorO
The rotational movement of the stock within the chamber re ults in large centrifugal force~ and a significant increase in pre~sure near the outer periphery or cylindrical wall~ As a result of the inlet line being located in the outer periphery of the chamber~ a ~ignificantly large pressure head is required to force the stock in~o the chamber for processingO Further~ ~he fact tha~ the exaet rate of accumulation of lightweight rejects adjacent the central portion of the wall opposite tha impeller is not known9 and can vary throughout the operation of the apparatus ~, it is basically guesswork how o~ten and how long the lightweight rejects lB68959 - ~ort should be opened.
~E~ ' ' Applicants have discovered that pulping and grading units of the type generally described above act more in the nature of a low power~ heavy duty defibering screen rather than a vortex separatorO The ~tock is pulped within th0 cha~ber and the accepts pass through the screen behind the impellerO Lightweight rejects tend to concentrate near the radially edge of the wall containing the screenO Heavy rejects follow the flow of the fluid radially outwardly and axially away from the Lmpeller and tend to accumulate along the outer cylindrical wall and adja~ent the end wall oppo~ite the impsllerO The lightweight rejects, therefore~ can be continuous- :
ly tapped off through the cylindrical wall in an area ~ear the end wall containîng the screen w~ile the heavy rejects can be tapped off through an outlet in the cylindrical chamber near the wall opposite the impeller. The inlet line~ therefore~ can be disposed in the wall opposite the impeller and located ~entrally thereofO
Since the inlet line is disposed centrally of the end wall and at axi3 of rotation, the pressure required to force the stock into the appaxatus is reduce~ quite signi~icantly and in some cases to the extent that it ca~ be introduced into the appàratus merely by gravityO
Applica~ts have also discovsred tha quite surpri~ingly, efficiency of removal of waste material increase~ as the inlet ~low increa~es.
It is an object, there~ore9 of the present .invention to provide a pulping and grading system with reduced powsr require-ment~ without s ignif ican~ 103s in pulping and separating e~iiciency.
It i~ a ~urther object of the present invention to provide :
~ 0689~
` method ~or pulping and grading waste materi~l wi~h increased power efficiency~
Other objeets will be in part apparent and in part pointed out more in detail hereinafterO
The invention accordingly consists of the features of con-skruction9 combination of elements and arrangement of part~ which :-will be exemplified by the construction hereinafter set forth and the scope of the inven~ion will be indicated in the appended claLms.
BRIEF DESCRIPT ION OF TH~ DRAWIN~S ~ ~
Figuxe 1 is a ~ide view of an apparatus constructed in ~ .
accordance with the present inventi~n with portion~ broken away;
Figure 2 is a sectional view of the apparatu~ of Figure 1 taken substantially along line 2-2 of Figure 1 with portions broken away;
Figure 3 is a graph illustrating the inlet pressure re-quirements o~ the me~hod and apparatus of the present invention compared to a prior art method and apparatus; and Figure 4 i~ a graph illustrating ths lightweight rejecks removal efficiency of the method and apparatus of the present in-vention compared to a prior art method and ~pparatus.
D~ ~ ME~TS
With refarence to the drawings~ and in ~articular Figures1 and 2~ there is illustrated an apparatus 1 for pulping and grading waste material~ particularly the pulping and yrading of waste paper~
The apparatu~ 1 includes a generally cylindrical chamber ~ defined :;
by a sub~tantially cylindrical wall 3, a first end wall 4 and a second end wall 50 While the chamber is illustrated as being truly ~ylindr.ical wi~h flat end wall~ it will be illu~trated that khe cylindrical wall need not be perfectly cylindrical nor need the end - 3 ~
~_11 be perfectly flatD ~he end walls 4 and 5 may~ for example~
merge with the cylindrical wall 3 through a smooth curve. For purposes o~ describing the location and orientation of the various parts9 an axis 6 extending perpendicularly through the center of both end walls and through the c~nter of the cylindrical chamber will be re~erred to hareinafter as the central axis 6 A generally circular perforate area 7 is located centrally in the first end wall 4. This perforate area provides a screening ` arrangement for permitting accept~ to pass through the end wall 4 and may have holes or perforations of whatever size and shape as is de-sired for most efficient screening of the particular type of stock being used taking into consideration the specific quality and grade of accepts required.
An impeller .8 is disposed within the chamber in a known manner adjacent the perforate area 7 with its xotational axis co- -~
incident with the central axis 6 of the apparatus lo A shaft 9~ which is connected to a source of rota~ional power9 (not illu~trated) ex~
tends through the end wall 4 and is operably connected to the impeller 8 ko impar rotational motion thereto.
In accordance with the present invention~ a supply line or :
pipe lO is connected to an inlet nozzle 11 disposed centrally within the second wall 5O The inlet ~ozzle ll therefore~ has its center coincident with the centxal axis 6 of the chamber 2 and provides for stock to enter the chamber 2 through the second end wall 5 and at a point directly opposite the impeller 8 adjacent the perforate area 70 A light rejects nozzle 12 is located in the apparatus l in an area disposed radially outwardly o~ the per~orate area ~O
More specifically~ the light rejects outlet 12 is located in the cylinclrical wall 3 and next adjacent the ~irst end wall 4O Further9 s best seen in Figure 2, the light reject~ nozzle 12 exits from the cylindrical wall 3 in a direction which i5 tangent to the cylindrical wall 3 and is connected to a light rejscts pipe 13~ Al~
though it i8 not illu~trated it may be de3irable to have a pump connected to the pipe 13 for assisting in transporting light rejects . :
to the next point in the process.
A heavy re~ects outlet 14 is disposed in the cylindrical wall 3 near the second end wall 5. In the specific em~odiment illustrated, the heavy rejects outlet 14 is disposed next adjacent 10 the first wall 5~ This provides the heavy rejects outlet at the point of last migration of heavy particles along the cylindrical wall ~
3 thus avoiding the buildup of heavy rejects adjacent the second wall ;: :
5 which can continue to whirl around the chamber causing excessive weaxO Also~ as best see~ in Figure 29 the heavy rejects outlet extsnd~ in a direction tangent to the cylindrical wall 3 and is connected to a rejects pipe 15.
An accepts chamber 16 is connected to the ~irst wall 4 and encloses the area outside the chamber 2 adjacent the perforate area 7 for receiving accepts paæsing through the perforate area or screell 70 An exit 17 is connected o the accepts chamd~er 16 and in communication with an accepts pipeline 18.
Particularly with reference to Figure 2 in the particular embodiment illustrated, the rotation of the Lmpeller i5 indicated by the arrow 19 0 Thus g it can be ~een that not only are the light rejec~s outlet 12 and heavy rejects outlet 14 disposed in directions tangential to the cylindrical wall 3, but they also are arranged to ~:
extend in the general direction of the rotation of the lmpeller l9o The impeller 19 imparts a pumping a~d whirling motion to the slurry or ~to~k withi~ the chamber~ generally in the direction of the ~ 5 ~
9s9 : rrows 20D æhe stock~ therefore~ enters the inlet line at 11 generally indicated by the arrow 21. The inlet nozzle 11 extends in a direction parallel to the central axis 6 to provide that the stock enters the chamber 2 in a direction along the central axis 6 and toward the L~peller 8. The impeller 8 provides a pulping action and imparts the whirling motion descr~bed above which causss the stock to rotate through the chamber 2 in the direction of the arrow~
20 illustrated in Figure 20 The whirling stock proceeds rearward}y from the ~irst wall 4 toward the second wall 5~ as illustratad by ~:
the arrows 20 in Figure 20 Accepts pa~ through the screen 7 into the accept chambers 16 and subsequently out throu~h the outlet nozzle 17. Fine rejects become concentrated adjacent the first wall 4 and are continuously :~
tapped o$f through the light rejects line 12. Heavy rejects are thrown radially outwardly by centrifugal force and migrate rear-wardly toward the second wall 5 and are rejec$ed through the heavias reject nozzle 14~
The apparatus of the present invention was compar d with a known apparatus with respect to inlet pressure requirements and capabili~y of separating light weight rejects, i.eO, reject~ having a specîfic gravity les~ than 1. The standard apparatus included a generally cylindrical chamber having a first end wall with a per-forate area and an L~peller next adjacent therekoO The second end wall was disposed opposite the first end wall with a light rejects no~zle dispo~ed at the axial csnter thereof. The stock inlet was tangential to tha cylindrical wall and located adjacent the second wall. The 3tandard apparatus9 therefora~ was sub tantially the same as the apparatus of the present invention with the exception that ~he inlet of th~ standard apparatus was locatad in the cyl.in-: : , : ,.
drical wall in a known manner and ~he light rejects outlet was lo~
cated ce~trally in the end wall opposite the Lmpeller in a known manner.
As illustrated in the following table and in Figures 3 and 4J the required inlet pressure for a given accept flow was significantly less fox the apparatus constructed in accordance with the present inventian.
TABLE
GPM AC OE PTS PSI I~hET ~ OF LIGHT WEIG~T
F~ )W PRESSU~ P~3JE~!S PE;MOVAL
Prior Art 200 17 38.4 : :
Separator 300 18u5 32.7 400 18.5 20.0 Separator of 100 7.75 4107Present 205 8.5 34.9 Invention 320 11 4702 400 1~ 37~5 The efficiancy in removing lightweight contaminates or the ,,.: :
: ~ percent of ~ightweight rejects removed9 was ~ignificantly greater with the apparatus constructed in accordance with the present in-vention, partieularly at the higher flow rates. This is particu-larly valuable since heretofore separators of ~he general type ~:
described have decreased in efficiency of removal of lightweight rejects as the accepts flow :rate increasedO The apparatus o~ the present invention, however~ provi~e~ e~sentially no decrease in efficiency of xemoval o~ lightweight rejects as ths accepts flow increases. ~.
It can ba seen9 therefore~ that the present invention provides an apparatus and a method for pulping and separating ::
waste ma~erial which sub~tantially reduce~ the inlet pressure ~ 7 ~
~?613959 required with no signi~icant loss in e~ficiency of removal oflightweiyht rejects and, in fact9 provides improvement in the removal of lightweight rejects at higher flow rates. This psrmits an increase in flow and thus an increase in production and at the ; same time an increase in the rate of removal of lightweight rejects. In additionJ all this is accomplished with a redu~tion of power requirements to get the stock into the pulper/separator and sometimes wi~h the inlet pump eliminated altogether.
While this specific representative embodiment and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various change~ and mo~ifications may be made therein without departing from the spirit or scope of the invention.
~ ' '~' , :, ~
Claims (17)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for pulping and grading waste material, particularly for the pulping and grading of waste paper, said apparatus comprising:
a cylindrical chamber having a first end wall, a second end wall, a cylindrical wall and a central axis extending through said chamber and both end walls thereof;
a perforate area concentrically disposed in said first wall;
a single impeller only in said chamber adjacent said perforate area and having its rotational axis coincident with said central axis to provide rotational motion of the waste material in the chamber about the central axis concurrently with movement of said material radially outwardly adjacent to said perforate area and back toward said second wall;
an inlet means to said chamber disposed centrally in said second end wall;
an inlet pipe connected to said inlet means;
a first outlet in said chamber for light rejects disposed in said cylindrical wall;
a lightweight rejects pipe connected to said first outlet;
a second outlet for heavy rejects in said cylindrical wall disposed adjacent said second wall, and means providing a takeoff chamber to receive a stream of accepted material passing through said annular perforate area.
a cylindrical chamber having a first end wall, a second end wall, a cylindrical wall and a central axis extending through said chamber and both end walls thereof;
a perforate area concentrically disposed in said first wall;
a single impeller only in said chamber adjacent said perforate area and having its rotational axis coincident with said central axis to provide rotational motion of the waste material in the chamber about the central axis concurrently with movement of said material radially outwardly adjacent to said perforate area and back toward said second wall;
an inlet means to said chamber disposed centrally in said second end wall;
an inlet pipe connected to said inlet means;
a first outlet in said chamber for light rejects disposed in said cylindrical wall;
a lightweight rejects pipe connected to said first outlet;
a second outlet for heavy rejects in said cylindrical wall disposed adjacent said second wall, and means providing a takeoff chamber to receive a stream of accepted material passing through said annular perforate area.
2. An apparatus as claimed in claim 1 wherein the outlet for lightweight rejects is located in said cylindrical wall next adjacent said first wall.
3. An apparatus as claimed in claim 1 wherein the outlet for heavy rejects is located next adjacent said second wall.
4. An apparatus as claimed in claim 3 wherein the outlet for light rejects is located in said cylindrical wall next adjacent said first wall.
5. An apparatus as claimed in claim 2 wherein the outlet for light rejects is tangential to said cylindrical wall and arranged to discharge the light rejects in the direction of rotation of said impeller.
6. An apparatus as claimed in claim 5 wherein the outlet for heavy rejects is disposed adjacent said second wall, is tangential to said cylindrical wall and is arranged to discharge the heavy rejects in the general direction of rotation of said impeller.
7. An apparatus as claimed in claim 1 wherein said inlet means has its axis parallel to and coincident with said central axis for a sufficient length of said inlet means such that the waste material enters said cylindrical chamber in a direction along said central axis and toward said impeller.
8. An apparatus as claimed in claim 4 wherein said inlet means has its axis parallel to and coincident with said central axis for a sufficient length of said inlet such that the stock enters said cylindrical chamber in a direction along said central axis and toward said impeller.
9. An apparatus as claimed in claim 6 wherein said inlet means has its axis parallel to and coincident with said central axis for a sufficient length of said inlet such that the stock enters said cylindrical chamber in a direction along said central axis and toward said impeller.
10. In a method of pulping and grading waste paper for use in making paper and the like in a separator unit of the type having a chamber defined by a cylindrical wall, a first end wall having a perforate screen and a second end wall opposite said first end wall and further including one impeller only in said chamber adjacent said first wall to provide rotational movement of said material concurrently with movement of said material radially outwardly in the area of said impeller and back toward said first wall, the improvement comprising:
introducing waste paper through an inlet in the axial center of said second end wall;
removing lightweight rejects through an opening in said chamber in said cylindrical wall;
removing heavy rejects from an outlet in said chamber in an area near said second end wall; and removing accepted material which passes through said perforate screen.
introducing waste paper through an inlet in the axial center of said second end wall;
removing lightweight rejects through an opening in said chamber in said cylindrical wall;
removing heavy rejects from an outlet in said chamber in an area near said second end wall; and removing accepted material which passes through said perforate screen.
11. A method as claimed in claim 10 wherein said light rejects are removed from said chamber through an outlet located in said cylindrical wall and disposed next adjacent said first end wall.
12. A method as claimed in claim 10 wherein the heavy rejects are removed through an outlet located in said cylindrical wall and disposed next adjacent said second end wall.
13. A method as claimed in claim 12 wherein the light rejects are removed from an outlet located in said cylindrical wall and disposed next adjacent said first end wall.
14. A method as claimed in claim 13 wherein said light rejects and said heavy rejects are removed from said chamber respectively in directions which are tangential to said cylindrical wall and in the direction of rotation of said impeller.
15. A method as claimed in claim 10 wherein said waste paper is introduced into said chamber along the central axis thereof and in a direction toward the impeller.
16. A method as claimed in claim 13 wherein said waste paper is introduced into said chamber along the central axis thereof and in a direction toward the impeller.
17. A method as claimed in claim 14 wherein said waste paper ?s introduced into said chamber along the central axis thereof and in a direction toward the impeller.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75635777A | 1977-01-03 | 1977-01-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1068959A true CA1068959A (en) | 1980-01-01 |
Family
ID=25043120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA288,698A Expired CA1068959A (en) | 1977-01-03 | 1977-10-13 | Apparatus for pulping and grading waste material |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5386810A (en) |
| BR (1) | BR7708598A (en) |
| CA (1) | CA1068959A (en) |
| DE (1) | DE2757175C2 (en) |
| ES (1) | ES465629A1 (en) |
| GB (1) | GB1584574A (en) |
| IT (1) | IT1088976B (en) |
| MX (1) | MX146734A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3005518A1 (en) * | 1979-02-16 | 1980-09-04 | Beloit Walmsley Ltd | FABRIC SEPARATOR |
| DE3140549C2 (en) * | 1981-10-13 | 1986-10-16 | J.M. Voith Gmbh, 7920 Heidenheim | Sorting device for fiber suspensions in the paper industry |
| FR2543183B1 (en) * | 1983-03-25 | 1985-07-26 | Lamort E & M | METHOD AND DEVICE FOR SORTING A MIXTURE OF PAPER PULP AND IMPURITIES |
| DE3311082A1 (en) * | 1983-03-26 | 1984-09-27 | J.M. Voith Gmbh, 7920 Heidenheim | METHOD AND DEVICE FOR DISPOSAL OF A FABRIC LOSS |
| JPS6290310U (en) * | 1985-11-25 | 1987-06-09 | ||
| JPS6290309U (en) * | 1985-11-25 | 1987-06-09 | ||
| JPS6295520U (en) * | 1985-12-06 | 1987-06-18 | ||
| JP2658007B2 (en) * | 1990-09-12 | 1997-09-30 | キヤノン株式会社 | Document processing device |
| DE19602273C1 (en) * | 1996-01-23 | 1997-02-27 | Lohse Verwaltungs Gmbh | Device for breaking up and sorting waste materials for recycling |
| US6131587A (en) * | 1998-09-28 | 2000-10-17 | 144 Limited Partnership | Hand washing and drying apparatus and system including waste disposal apparatus and method |
| GB201515859D0 (en) | 2015-09-08 | 2015-10-21 | Rolls Royce Plc | Debris separator |
| CN105921214B (en) * | 2016-04-29 | 2018-10-16 | 王恒标 | It is layered grinding equipment |
| CN106948205B (en) * | 2017-04-13 | 2023-07-04 | 济南大学 | Pulping equipment based on rotary lifting type rotor pulping |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2973153A (en) * | 1958-05-16 | 1961-02-28 | Improved Machinery Inc | Pulper |
| US3525477A (en) * | 1967-09-07 | 1970-08-25 | Tadashi Kobayashi | Device for fine screening of paper stock |
| DE2140372A1 (en) * | 1971-08-12 | 1973-03-01 | Voith Gmbh J M | WASTE PAPER PROCESSING PLANT |
| JPS5134962B2 (en) * | 1972-05-23 | 1976-09-29 |
-
1977
- 1977-10-13 CA CA288,698A patent/CA1068959A/en not_active Expired
- 1977-11-21 GB GB48313/77A patent/GB1584574A/en not_active Expired
- 1977-12-12 JP JP14827077A patent/JPS5386810A/en active Granted
- 1977-12-16 MX MX171758A patent/MX146734A/en unknown
- 1977-12-22 DE DE2757175A patent/DE2757175C2/en not_active Expired
- 1977-12-23 BR BR7708598A patent/BR7708598A/en unknown
- 1977-12-30 ES ES77465629A patent/ES465629A1/en not_active Expired
- 1977-12-30 IT IT31428/77A patent/IT1088976B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE2757175A1 (en) | 1978-07-13 |
| ES465629A1 (en) | 1978-09-16 |
| JPS5737719B2 (en) | 1982-08-11 |
| IT1088976B (en) | 1985-06-10 |
| DE2757175C2 (en) | 1984-12-13 |
| BR7708598A (en) | 1978-08-22 |
| MX146734A (en) | 1982-08-04 |
| JPS5386810A (en) | 1978-07-31 |
| GB1584574A (en) | 1981-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |