CA1310216C - Dual inlet impregnation for mechanical pulping - Google Patents
Dual inlet impregnation for mechanical pulpingInfo
- Publication number
- CA1310216C CA1310216C CA000566818A CA566818A CA1310216C CA 1310216 C CA1310216 C CA 1310216C CA 000566818 A CA000566818 A CA 000566818A CA 566818 A CA566818 A CA 566818A CA 1310216 C CA1310216 C CA 1310216C
- Authority
- CA
- Canada
- Prior art keywords
- feeders
- recited
- presteaming
- impregnation
- impregnator
- 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
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Abstract
ABSTRACT OF THE DISCLOSURE
Two different types of comminuted cellulosic fibrous material (e.g. wood chips) are commonly fed to a single impregnator and refiner in the production of mechanical pulp. First and second presteaming vessels are operatively connected through plug screw feeders to a header, in turn connected to a impregnator (such as an inclined screw impregnator). The impregnator is in turn connected to a refiner. A control device controls the speeds of operation of the motors for the plug screw feeders, thereby controlling the mix of different material species from the presteaming vessels to the impregnator to thereby control the composition of the mechanical pulp being produced.
Two different types of comminuted cellulosic fibrous material (e.g. wood chips) are commonly fed to a single impregnator and refiner in the production of mechanical pulp. First and second presteaming vessels are operatively connected through plug screw feeders to a header, in turn connected to a impregnator (such as an inclined screw impregnator). The impregnator is in turn connected to a refiner. A control device controls the speeds of operation of the motors for the plug screw feeders, thereby controlling the mix of different material species from the presteaming vessels to the impregnator to thereby control the composition of the mechanical pulp being produced.
Description
nu L INLFT IMPRE~NAT ON FOR M~CiU~!_CAL PULP_NG
yy~L~LU~D~ ANn~ SD~U~Y OE TEE INVENTION
In the production of mechanical pulp, there are a number of situations in which it is desirable to optimize the final properties of a mechanical pulp being produced by using two different types of wood (or other comminuted cellulosic fibrous mat~rial) species. A number of practical problems can be associated with such a procedure, and obtaining the right mix of materials, properly pretreating the materials prior to refining, etc.
According to the present invention a method and flpparatus are provided which overcome the practical difficul.ties associated with mixing two different wood species together prior to refining to produce a mechanical pulp having the desired properties.
;According to the present inventIon, two presteaming bins are utilized, each bin bei~ng filled with a differe~t specie~ of comminuted cellulosic . ~ 20 fibrous material. The bins are connected to a common impregnation means, such as an inclined screw :impregnator. Operative connection between the bins and the impregnator preferably is provided by utili~ing a separate plug screw feeder with wiper 25 ~associated with each bin, the screw feeders being connected to a common header which in turn is connected to the impre.gnator. I~e impregnation liquid ~different for each species if desired) may be added between the bins and the header. The impregnator is operatively connected to a refiner w~ich produces mechanical pulp from the fibrous : ~ :
~, .
1~10216 material fed thereto.
In order to properly control the mix of the species fed to the impregnator, a common control means is provided which controls the rate of feed of each of the species to the impregnator. For example, where each of the screw feeders is operated by a motor, such as an electric motor, the com~on control means will control the speeds of the motors so that they are proportioned properly to feed the desired proportions of material to the impregnator to produce the mechanical pulp having the final properties desired.
According to the method of the present invention, mechanical pulp is produced from comminuted cellulosic fibrous material by the steps of: (a) Presteaming a first type of cellulosic fibrous material. (b) Presteaming a second type of cellulosic fibrous material, different from the first type. (c) Feeding the first and second presteamed types of material to a common impregnator at positive rates. (d) Controlling the feeding of the types separately so that a desired proportional mix of materials are fed to the common impregnator. And, (e) refining the impregnated mixture of first and second types of comminuted fibrous materiai to produce a mechanical pulp having the desired properties. ~ ~
It is the primary object of the present invention to provide the effective production of mechanical pulp having the desired propertieæ, utilizing two different types of raw material species. This and other objects of the invention will become clear from an inspection of the datailed description of the inveIItion and from the appended claims.
BRIEF DESCRIPTION OF TEE DRAWING
FIGURE 1 schematically illustrates e~emplary apparatus according to the invention, for practicing the method according to the invention.
DETAILED DESCRIPTION OF THE _RAWING
Exemplary apparatus according to the invention illustrated in FIGURE 1 includes an impregnating means lQ, which preferably is operatively connected : to a header 12, which in turn is operatively ~: connected to first and second feeders 14, 16. The impregnation mea~s 10 may comprise any desired conventional~type, an incl~lned:screw feeder being : 15 illustrated as the impregnation means lQ in FIGURE
The feeders 14, 16 also may comprise any desired conventional type. In the exemplary~embodiment : illustrated, the feeders comprise conventional plug ~ 20 screw feeders with wipers. The feeders each have a : : : :: motor,; such~as motors 15, 17, respectively, effecting operation~the~reof. For examp~le the motors l5, 17 may ba;electric motors.: The motors 15, 17 are connected up to a common control;means l9, which may comprise ; 25 any conventional con-rol, such~as a computer : cGntrol. The~ontrol means 19 controls the speeds of operation of the motors 15, 17:(and/or other characteristics thereof), and:thereby controls the rate of feed of materiaI by each of the feeders 14, 16 to the i~pregnator 10.
Operatively connected to the feeders 14, 16 are first and second distinct presteaming vessels 20, 22. The first vessel 20 is opera-tively connected through a discharge mechanism 21, which preferably is a vibratory discharge mechanism, to the first plug screw feeder 14. The presteaming vessel 20, with vibratory discharge 21, can comprisveBaR~con~entional presteaming vessel, known as the "~FUr}~P',*
10 marketed by Kamyr, Inc. of Glens Falls, New York.
The second presteaming vessel 22 also preferably has a vibratory bin discharge 24, which is operatively connected up to the second screw feeder 16.
Note that in the exemplary embodiment illustrated the presteaming vessels 20, 22 are approximately the sàme size. The control aspects are provided by controlling the motors lS, 17 to proportion the mixture of species fed to the 20 impregnatOr 10.
The im~regnating means 10 is operatively connected to a conventional refiner (defibrator) 26 which produces mechanical pulp, acting on the mixtur~
of material species fed to the impregnator 10 from 25 the presteaming vessels 20, 22.
Impregnating liquid may be added to the material just prior to the header 12, if desired. For example a first impregnation liquid can be added through conduit 28 to the species of material being fed by 30 the first plug feeder 14 to~the header 12, while a second impregnation liquid (the second impregnation liquid the same as, or different than, the liquid in conduit 28) may be fed through conduit * a trade-mark of Kamyr, Inc.
'~,~ ,.
29 to the second feeder 16 prior to the header 12.
Utilizing the apparatus in FIGURE 1, the steamed wood chips from the vessels 20, 22 will be vibratorily discharged into the feeders 14, 16 5 which will feed them to the header 12, to the impregnator 10, and ultimately to reiner 26. The desired properties of pulp are produced by controlling the feeders 14, 16 -- as by controlling the speeds of motors lS, 17 with the control means lg -- so that the desired proportion of species (which could range anywhere from 1%/99% to 50-50 to 99~/1%) to produce mechanical pulp having the desired properties is provided.
It will thus be seen that according to the present invention a simple yet effective method and apparatus are provided ~or the production of mechanical pulp having desired properties from two different species of comminuted cellulosic materia:l. While the invention has been herein shown and described in what is presently conceived to be the most~practisal and preferred embodiment thereof, it will be apparent to those:of ordinary skill in the :
art that many modifications:may be made thereof within the scope of the invention, which scope is to 25 be accorded the broadest interpretation of the ~: ~ appended claims so~as to encompass all equivalent :.
apparatus and:processes. :~
:
~ : .
yy~L~LU~D~ ANn~ SD~U~Y OE TEE INVENTION
In the production of mechanical pulp, there are a number of situations in which it is desirable to optimize the final properties of a mechanical pulp being produced by using two different types of wood (or other comminuted cellulosic fibrous mat~rial) species. A number of practical problems can be associated with such a procedure, and obtaining the right mix of materials, properly pretreating the materials prior to refining, etc.
According to the present invention a method and flpparatus are provided which overcome the practical difficul.ties associated with mixing two different wood species together prior to refining to produce a mechanical pulp having the desired properties.
;According to the present inventIon, two presteaming bins are utilized, each bin bei~ng filled with a differe~t specie~ of comminuted cellulosic . ~ 20 fibrous material. The bins are connected to a common impregnation means, such as an inclined screw :impregnator. Operative connection between the bins and the impregnator preferably is provided by utili~ing a separate plug screw feeder with wiper 25 ~associated with each bin, the screw feeders being connected to a common header which in turn is connected to the impre.gnator. I~e impregnation liquid ~different for each species if desired) may be added between the bins and the header. The impregnator is operatively connected to a refiner w~ich produces mechanical pulp from the fibrous : ~ :
~, .
1~10216 material fed thereto.
In order to properly control the mix of the species fed to the impregnator, a common control means is provided which controls the rate of feed of each of the species to the impregnator. For example, where each of the screw feeders is operated by a motor, such as an electric motor, the com~on control means will control the speeds of the motors so that they are proportioned properly to feed the desired proportions of material to the impregnator to produce the mechanical pulp having the final properties desired.
According to the method of the present invention, mechanical pulp is produced from comminuted cellulosic fibrous material by the steps of: (a) Presteaming a first type of cellulosic fibrous material. (b) Presteaming a second type of cellulosic fibrous material, different from the first type. (c) Feeding the first and second presteamed types of material to a common impregnator at positive rates. (d) Controlling the feeding of the types separately so that a desired proportional mix of materials are fed to the common impregnator. And, (e) refining the impregnated mixture of first and second types of comminuted fibrous materiai to produce a mechanical pulp having the desired properties. ~ ~
It is the primary object of the present invention to provide the effective production of mechanical pulp having the desired propertieæ, utilizing two different types of raw material species. This and other objects of the invention will become clear from an inspection of the datailed description of the inveIItion and from the appended claims.
BRIEF DESCRIPTION OF TEE DRAWING
FIGURE 1 schematically illustrates e~emplary apparatus according to the invention, for practicing the method according to the invention.
DETAILED DESCRIPTION OF THE _RAWING
Exemplary apparatus according to the invention illustrated in FIGURE 1 includes an impregnating means lQ, which preferably is operatively connected : to a header 12, which in turn is operatively ~: connected to first and second feeders 14, 16. The impregnation mea~s 10 may comprise any desired conventional~type, an incl~lned:screw feeder being : 15 illustrated as the impregnation means lQ in FIGURE
The feeders 14, 16 also may comprise any desired conventional type. In the exemplary~embodiment : illustrated, the feeders comprise conventional plug ~ 20 screw feeders with wipers. The feeders each have a : : : :: motor,; such~as motors 15, 17, respectively, effecting operation~the~reof. For examp~le the motors l5, 17 may ba;electric motors.: The motors 15, 17 are connected up to a common control;means l9, which may comprise ; 25 any conventional con-rol, such~as a computer : cGntrol. The~ontrol means 19 controls the speeds of operation of the motors 15, 17:(and/or other characteristics thereof), and:thereby controls the rate of feed of materiaI by each of the feeders 14, 16 to the i~pregnator 10.
Operatively connected to the feeders 14, 16 are first and second distinct presteaming vessels 20, 22. The first vessel 20 is opera-tively connected through a discharge mechanism 21, which preferably is a vibratory discharge mechanism, to the first plug screw feeder 14. The presteaming vessel 20, with vibratory discharge 21, can comprisveBaR~con~entional presteaming vessel, known as the "~FUr}~P',*
10 marketed by Kamyr, Inc. of Glens Falls, New York.
The second presteaming vessel 22 also preferably has a vibratory bin discharge 24, which is operatively connected up to the second screw feeder 16.
Note that in the exemplary embodiment illustrated the presteaming vessels 20, 22 are approximately the sàme size. The control aspects are provided by controlling the motors lS, 17 to proportion the mixture of species fed to the 20 impregnatOr 10.
The im~regnating means 10 is operatively connected to a conventional refiner (defibrator) 26 which produces mechanical pulp, acting on the mixtur~
of material species fed to the impregnator 10 from 25 the presteaming vessels 20, 22.
Impregnating liquid may be added to the material just prior to the header 12, if desired. For example a first impregnation liquid can be added through conduit 28 to the species of material being fed by 30 the first plug feeder 14 to~the header 12, while a second impregnation liquid (the second impregnation liquid the same as, or different than, the liquid in conduit 28) may be fed through conduit * a trade-mark of Kamyr, Inc.
'~,~ ,.
29 to the second feeder 16 prior to the header 12.
Utilizing the apparatus in FIGURE 1, the steamed wood chips from the vessels 20, 22 will be vibratorily discharged into the feeders 14, 16 5 which will feed them to the header 12, to the impregnator 10, and ultimately to reiner 26. The desired properties of pulp are produced by controlling the feeders 14, 16 -- as by controlling the speeds of motors lS, 17 with the control means lg -- so that the desired proportion of species (which could range anywhere from 1%/99% to 50-50 to 99~/1%) to produce mechanical pulp having the desired properties is provided.
It will thus be seen that according to the present invention a simple yet effective method and apparatus are provided ~or the production of mechanical pulp having desired properties from two different species of comminuted cellulosic materia:l. While the invention has been herein shown and described in what is presently conceived to be the most~practisal and preferred embodiment thereof, it will be apparent to those:of ordinary skill in the :
art that many modifications:may be made thereof within the scope of the invention, which scope is to 25 be accorded the broadest interpretation of the ~: ~ appended claims so~as to encompass all equivalent :.
apparatus and:processes. :~
:
~ : .
Claims (20)
1. A method of producing mechanical pulp from comminuted cellulosic fibrous material, comprising the steps of:
(a) presteaming a first type of cellulosic fibrous material;
(b) presteaming a second type of cellulosic fibrous material, different from the first type;
(c) feeding the first and second presteamed types of material to an impregnator at positive rates;
(d) controlling the feeding of the types of material separately so that a desired proportional mix of materials are fed to the common impregnator;
and (e) refining the common mixture of impregnated first and second types of cellulosic fibrous material to produce a mechanical pulp.
(a) presteaming a first type of cellulosic fibrous material;
(b) presteaming a second type of cellulosic fibrous material, different from the first type;
(c) feeding the first and second presteamed types of material to an impregnator at positive rates;
(d) controlling the feeding of the types of material separately so that a desired proportional mix of materials are fed to the common impregnator;
and (e) refining the common mixture of impregnated first and second types of cellulosic fibrous material to produce a mechanical pulp.
2. A method as recited in claim 1 comprising the further steps of, just prior to mixing the first:
and second types of material together in the impregnator, feeding an impregnation liquid to each of the first and second types of material.
and second types of material together in the impregnator, feeding an impregnation liquid to each of the first and second types of material.
3. A method as recited in claim 2 wherein the impregnation liquids fed to the first and second types of material are different impregnation liquids.
4. Mechanical pulping apparatus comprising:
a first presteaming vessel;
a second presteaming vessel distinct from said first vessel;
impregnation means operatively connected to both the first and second presteaming vessels;
control means for controlling the amount of material fed from each presteaming vessel to said impregnation means; and a refiner operatively connected to said impregnation means for refining material fed to it from said impregnation means to produce mechanical pulp.
a first presteaming vessel;
a second presteaming vessel distinct from said first vessel;
impregnation means operatively connected to both the first and second presteaming vessels;
control means for controlling the amount of material fed from each presteaming vessel to said impregnation means; and a refiner operatively connected to said impregnation means for refining material fed to it from said impregnation means to produce mechanical pulp.
5. Apparatus as recited in claim 4 wherein said presteaming vessels are operatively connected to said impregnation means by first and second feeders, respectively; and wherein said feeders are controlled by control means.
6. Apparatus as recited in claim 5 wherein said feeders are plug screw feeders.
7. Apparatus as recited in claim 6 wherein each of said feeders has an electric motor for powering the feeding action thereof; and wherein said control means controls the speed of said electric motor.
8. Apparatus as recited in claim 7 wherein said presteaming vessels are vibratory bins.
9. Apparatus as recited in claim 7 wherein said impregnation means comprises an inclined screw impregnator.
10. Apparatus as recited in claim 6 wherein said screw feeders are connected up to a header chamber, which in turn is connected to said impregnating means.
11. Apparatus as recited in claim 10 further comprising liquid addition means provided between each of said feeders and said header chamber.
12. Apparatus as recited in claim 11 wherein each of said presteaming vessels is of approximately the same size.
13. Apparatus as recited in claim 4 wherein said impregnation means comprises an inclined screw impregnator.
14. Apparatus as recited in claim 13 wherein said presteaming vessels are operatively connected to said impregnation means by feeders, said feeders being controlled by control means, and wherein said feeders are plug screw feeders.
15. Apparatus as recited in claim 14 wherein said screw feeders are connected up to a header chamber, which in turn is connected to said impregnation means.
16. Apparatus as recited in claim 15 further comprising liquid addition means provided between each of said feeders and said header chamber.
17. Apparatus as recited in claim 4 wherein said presteaming vessels are operatively connected to said impregnation means by feeders, said feeders being controlled by control means; and wherein said feeders are connected to said impregnation means through a header.
18. Apparatus as recited in claim 17 further comprising liquid addition means provided between each of said feeders and said header.
19. Apparatus as recited in claim 4 wherein each of said presteaming vessels is of approximately the same size.
20. Apparatus as recited in claim 17 wherein said feeders are powered by motors, and wherein said control means controls the speeds of said motors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9961487A | 1987-09-22 | 1987-09-22 | |
| US099,614 | 1987-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1310216C true CA1310216C (en) | 1992-11-17 |
Family
ID=22275842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000566818A Expired - Fee Related CA1310216C (en) | 1987-09-22 | 1988-05-13 | Dual inlet impregnation for mechanical pulping |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1310216C (en) |
-
1988
- 1988-05-13 CA CA000566818A patent/CA1310216C/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |