EP0423092A2 - Procedure for the refining of a pulp mixture or equivalent in a refiner - Google Patents
Procedure for the refining of a pulp mixture or equivalent in a refiner Download PDFInfo
- Publication number
- EP0423092A2 EP0423092A2 EP90850322A EP90850322A EP0423092A2 EP 0423092 A2 EP0423092 A2 EP 0423092A2 EP 90850322 A EP90850322 A EP 90850322A EP 90850322 A EP90850322 A EP 90850322A EP 0423092 A2 EP0423092 A2 EP 0423092A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- refiner
- returned
- pulp
- blades
- refining
- 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.)
- Withdrawn
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/22—Jordans
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
Definitions
- the present invention relates to a procedure for the refining of a pulp mixture or equivalent in a refiner comprising oppositely placed refiner blades, of which the rotor blade rotates and the stator blade is stationary, a pulp refining zone being formed between the blades.
- the motion of the rotor blade relative to the stator blade gives rise to a strong turbulence of the pulp mixture in the grooves of the blades.
- the pulp flows in the refiner in various directions.
- the pulp flows towards the delivery side in the grooves of both blades.
- the pulp in addition to the flow towards the delivery side, the pulp also flows transversely from the rotor blade to the stator blade and vice versa, and in the grooves of the stator blade the pulp also flows back towards the infeed side.
- the object of the invention is to create a procedure that achieves this aim.
- the procedure of the invention is characterized in that, by making use of the forces generated by the rotation of the rotor blade, the pulp mixture is separated into fractions or part of the pulp mixture is directed away from the area of the refiner blades for fractionation.
- a preferred embodiment of the invention is characterized in that at least one of the fractions obtained is returned to the same refiner.
- Another preferred embodiment of the invention is characterized in that at least one of the fractions obtained is returned to a separate refiner designed for this fraction.
- Yet another preferred embodiment of the invention is characterized in that the fraction to be returned is returned to the infeed side of the refiner.
- An advantage provided by the procedure of the invention is that it makes it possible to refine those fractions which need refining and to avoid overrefining fractions already refined.
- Fig. 1 illustrates the turbulent flow occurring in the grooves 5, 4 between the rotor blade 1 and the stator blade 2.
- the rotor blade rotates in the direction indicated by arrow 3.
- the grooves of the rotor blade are directly opposite to those of the stator blade.
- the rotor blade 1 has turned a little to the right.
- Fig. 2 illustrates the internal pulp flow within the refiner.
- the pulp flows in several directions.
- the pulp flows in the grooves 4, 5 of both the stator 2 and the rotor 1 blades towards the delivery side 6.
- the pulp also flows transversely from the rotor blade 1 to the stator blade 2 and from the stator blade back to the rotor blade, and in the grooves 4 of the stator blade 2 the pulp also flows back towards the infeed side 7.
- the different directions of flow are indicated with arrows in fig. 2.
- Fig. 3 illustrates the principle on which the refiner is utilized for separating pulp into fractions.
- the direction of rotation of the rotor blade 1 is again indicated by arrow 3.
- the procedure of the invention makes use of the motion of the rotor blade 1 (circumferential speed approx. 15-40 m/s) to achieve fractionation at points 8 and 10, where the pulp mixture is separated into corresponding fractions 8a, 8b, 8c and 10a, 10b, 10c. It is also possible to direct part of the pulp mixture out of the refiner at point 9 for external fractionation, resulting in fractions 9a, 9b, 9c. At least one of the fractions obtained is returned either to the same refiner or to a different refiner designed for the refining of this particular fraction.
- This fraction can be returned either to the infeed side 7, to the area of the refining zone or to the return flow taking place from the delivery side 6 to the stator blade 2.
- the invention is in no way restricted by the manner in which the forces generated by the rotary motion of the rotor blade are utilized for fractionation.
- the possible alternatives are e.g. the use of top separators in conjunction with the refiner blades, a hole or holes made through the blades, various screens etc.
Abstract
Description
- The present invention relates to a procedure for the refining of a pulp mixture or equivalent in a refiner comprising oppositely placed refiner blades, of which the rotor blade rotates and the stator blade is stationary, a pulp refining zone being formed between the blades.
- As is well known, the motion of the rotor blade relative to the stator blade gives rise to a strong turbulence of the pulp mixture in the grooves of the blades. During the refining process, the pulp flows in the refiner in various directions. At the infeed end of the refining zone, the pulp flows towards the delivery side in the grooves of both blades. In the refining zone, in addition to the flow towards the delivery side, the pulp also flows transversely from the rotor blade to the stator blade and vice versa, and in the grooves of the stator blade the pulp also flows back towards the infeed side.
- As the pulp mixture fed into the refiner is inhomogeneous, containing different fibre fractions, it is essential for the achievement of good refining results that it should be possible to refine those fractions which need refining and to avoid overrefining fractions already refined as well as to avoid superfluous and damaging refining of fractions which need no refining at all. The object of the invention is to create a procedure that achieves this aim. The procedure of the invention is characterized in that, by making use of the forces generated by the rotation of the rotor blade, the pulp mixture is separated into fractions or part of the pulp mixture is directed away from the area of the refiner blades for fractionation.
- A preferred embodiment of the invention is characterized in that at least one of the fractions obtained is returned to the same refiner.
- Another preferred embodiment of the invention is characterized in that at least one of the fractions obtained is returned to a separate refiner designed for this fraction.
- Yet another preferred embodiment of the invention is characterized in that the fraction to be returned is returned to the infeed side of the refiner.
- An advantage provided by the procedure of the invention is that it makes it possible to refine those fractions which need refining and to avoid overrefining fractions already refined.
- In the following, the invention is described in detail by the aid of examples of preferred embodiments by referring to the attached drawings, in which
- Fig. 1 illustrates the priniciple of the turbulence occurring in the grooves of the refiner blades at two different stages.
- Fig. 2 illustrates the principle of pulp flow within the refiner.
- Fig. 3 illustrates the principle of fractionation by the procedure of the invention.
- Fig. 1 illustrates the turbulent flow occurring in the
grooves rotor blade 1 and thestator blade 2. The rotor blade rotates in the direction indicated byarrow 3. In the first picture the grooves of the rotor blade are directly opposite to those of the stator blade. In the second picture, therotor blade 1 has turned a little to the right. - Fig. 2 illustrates the internal pulp flow within the refiner. During refining, the pulp flows in several directions. At the entry end of the refining zone, the pulp flows in the
grooves stator 2 and therotor 1 blades towards thedelivery side 6. In the refining zone, besides flowing towards thedelivery side 6, the pulp also flows transversely from therotor blade 1 to thestator blade 2 and from the stator blade back to the rotor blade, and in thegrooves 4 of thestator blade 2 the pulp also flows back towards theinfeed side 7. The different directions of flow are indicated with arrows in fig. 2. - Fig. 3 illustrates the principle on which the refiner is utilized for separating pulp into fractions. The direction of rotation of the
rotor blade 1 is again indicated byarrow 3. The procedure of the invention makes use of the motion of the rotor blade 1 (circumferential speed approx. 15-40 m/s) to achieve fractionation atpoints corresponding fractions point 9 for external fractionation, resulting infractions side 7, to the area of the refining zone or to the return flow taking place from thedelivery side 6 to thestator blade 2. - The invention is in no way restricted by the manner in which the forces generated by the rotary motion of the rotor blade are utilized for fractionation. Among the possible alternatives are e.g. the use of top separators in conjunction with the refiner blades, a hole or holes made through the blades, various screens etc.
- It is obvious to a person skilled in the art that of the invention is not restricted to the examples of its embodiments described above, but that it may instead be varied within the scope of the following claims.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI894730 | 1989-10-05 | ||
FI894730A FI92846C (en) | 1989-10-05 | 1989-10-05 | Process for refining pulp mixture in a refiner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0423092A2 true EP0423092A2 (en) | 1991-04-17 |
EP0423092A3 EP0423092A3 (en) | 1992-03-25 |
Family
ID=8529101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900850322 Withdrawn EP0423092A3 (en) | 1989-10-05 | 1990-10-01 | Procedure for the refining of a pulp mixture or equivalent in a refiner |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0423092A3 (en) |
FI (1) | FI92846C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111270544A (en) * | 2020-02-27 | 2020-06-12 | 安德里茨(中国)有限公司 | Refiner grinding disc, refiner, rotor and refiner |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1343452A (en) * | 1957-05-24 | 1963-11-22 | Process for defibrating and refining cellulosic materials | |
FR1508780A (en) * | 1966-02-01 | 1968-01-05 | Celleco Ab | Pulp pounding process |
WO1988000992A1 (en) * | 1986-08-07 | 1988-02-11 | Sunds Defibrator Aktiebolag | Apparatus for treatment of fibre suspensions |
WO1988003189A1 (en) * | 1986-10-31 | 1988-05-05 | Sunds Defibrator Jylhä Oy | Refiner |
US4820381A (en) * | 1987-02-25 | 1989-04-11 | Internationa Paper Company | Pulp refiner with fluidizing inlet |
-
1989
- 1989-10-05 FI FI894730A patent/FI92846C/en not_active IP Right Cessation
-
1990
- 1990-10-01 EP EP19900850322 patent/EP0423092A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1343452A (en) * | 1957-05-24 | 1963-11-22 | Process for defibrating and refining cellulosic materials | |
FR1508780A (en) * | 1966-02-01 | 1968-01-05 | Celleco Ab | Pulp pounding process |
WO1988000992A1 (en) * | 1986-08-07 | 1988-02-11 | Sunds Defibrator Aktiebolag | Apparatus for treatment of fibre suspensions |
WO1988003189A1 (en) * | 1986-10-31 | 1988-05-05 | Sunds Defibrator Jylhä Oy | Refiner |
US4820381A (en) * | 1987-02-25 | 1989-04-11 | Internationa Paper Company | Pulp refiner with fluidizing inlet |
Non-Patent Citations (1)
Title |
---|
TAPPI vol. 65, no. 7, 1 July 1982, ATLANTA pages 80 - 83; FOX, BRODKEY AND NISSAN: 'INSIDE A DISK REFINER' * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111270544A (en) * | 2020-02-27 | 2020-06-12 | 安德里茨(中国)有限公司 | Refiner grinding disc, refiner, rotor and refiner |
CN111270544B (en) * | 2020-02-27 | 2022-02-01 | 安德里茨(中国)有限公司 | Refiner grinding disc, refiner, rotor and refiner |
Also Published As
Publication number | Publication date |
---|---|
FI92846C (en) | 1995-01-10 |
FI894730A0 (en) | 1989-10-05 |
FI894730A (en) | 1991-04-06 |
FI92846B (en) | 1994-09-30 |
EP0423092A3 (en) | 1992-03-25 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 19920408 |
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17Q | First examination report despatched |
Effective date: 19940323 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19941003 |