EP0345234A2 - Feeding system for the former of a dry-paper machine - Google Patents
Feeding system for the former of a dry-paper machine Download PDFInfo
- Publication number
- EP0345234A2 EP0345234A2 EP89850167A EP89850167A EP0345234A2 EP 0345234 A2 EP0345234 A2 EP 0345234A2 EP 89850167 A EP89850167 A EP 89850167A EP 89850167 A EP89850167 A EP 89850167A EP 0345234 A2 EP0345234 A2 EP 0345234A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- former
- dry
- feeding
- paper machine
- fibre material
- 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- Withdrawn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
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/066—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being pulp sheets
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
Definitions
- This invention is related to a feeding system for the former of a dry-paper machine, in which feeding system the fibre material is disintegrated in such a form as is required by the former.
- the former of a dry-paper machine usually comprises a screening tanklike or tubular treating space, into which the web-forming fibre material is fed with air stream.
- a screening tanklike or tubular treating space into which the web-forming fibre material is fed with air stream.
- the former is normally fed with chemical pulp shredded, or disintegrated, in a hammer mill; and into the hammer mill the chemical pulp is fed direct from the roll.
- a system according to the invention is characterized by that it comprises a shredder, in which the chemical pulp web gets preshredded, a disc refiner, in which the preshredded chemical pulp gets defibrated, and fibre material transport devices between the various parts of the system for a continuous feeding of the former.
- the invention is based on the insight new to a person skilled in the art that it is both possible and economical to use a disc refiner in the manufacture of dry paper and that it is possible to construct the former so that it, for instance in continuous interaction with the defibration equipment, can fully utilize the defibration capacity of the disc refiner.
- an advantageous embodiment of a system according to the invention is characterized by that it includes devices for conveying into the disc refiner for a new defibration the material that has been rejected or otherwise remained unscreened in the former.
- the figure shows a dry-paper machine's former unit 1, which has a rotating cylindrical former drum 2 with a perforated mantle.
- the fibre material is fed through a pipe 3 into the drum 2, which disperses the fibres into an even fibre web 9 on the wire running under the drum.
- the fibre material is formed in accordance with the invention by shredding rolled chemical pulp 4 in a preshredder 5 and, sped up by a blower 7a, transporting it into a disc refiner 6 equipped with a feeding funnel and a conveyor screw, where the actual defibration occurs.
- a blower 7b raises the pressure in the pipe 3 if the process pressure of the refiner is not enough for transporting the fibres into the former drum 2.
- Fibres and fibre flocks that have travelled through the drum 2 are fed with a blower 7c through a pipe 8 back into the refiner 6.
- a secondary circuit for the blast air of the drum in which the air that has been sucked through the wire is returned with a blower 7d through a pipe 10 to act as a cleaning jet over the drum.
- the refiner can be equipped with various accessories for instance for feeding arrangements or to control the steam generated in the process. And for a multiphase refining of the fibre material, the refiner can also have more than one phase.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention is related to a feeding system for the former of a dry-paper machine, in which feeding system the fibre material is disintegrated in such a form as is required by the former. A system according to the invention comprises a shredder, in which the chemical pulp web gets preshredded, a disc refiner, in which the preshredded chemical pulp gets defibrated, and fibre material transport devices between the various parts of the system for a continuous feeding of the former.
Description
- This invention is related to a feeding system for the former of a dry-paper machine, in which feeding system the fibre material is disintegrated in such a form as is required by the former.
- The former of a dry-paper machine usually comprises a screening tanklike or tubular treating space, into which the web-forming fibre material is fed with air stream. In these apparatuses an even distribution of fibre material is sought by recirculating it and spreading it into a layer of even thickness on the forming wire. The former is normally fed with chemical pulp shredded, or disintegrated, in a hammer mill; and into the hammer mill the chemical pulp is fed direct from the roll.
- In comparison with other paper manufacturing methods, known systems of this type have the drawback that the raw material's fineness is relatively modest and the controllability of its properties poor. For this reason the manufacture of dry paper of finer quality, for instance, has been if not impossible then at least too costly as compared to other paper manufacturing methods.
- The object of this invention is to eliminate the above-mentioned disadvantages and create a system that has none of them and with which the forming stage in the manufacture of dry paper is at least technically raised to the level of other paper manufacturing methods. To achieve this, a system according to the invention is characterized by that it comprises a shredder, in which the chemical pulp web gets preshredded, a disc refiner, in which the preshredded chemical pulp gets defibrated, and fibre material transport devices between the various parts of the system for a continuous feeding of the former.
- By using a refiner type known in the first place from the manufacture of TMP and CTMP pulps as a defibrator in connection with a dry paper former, it is possible to achieve with the help of a preshredder a defibration more effective and more controllable and thus obtain better paper quality. For the controllability of the process, a disc refiner is much better than a hammer mill because the width of the refiner gap, the profile of the cutting elements, and other parameters can be freely determined, ever according to the raw material and the required product. Even at its highest, the cost of defibration here will not exceed the cost of defibration with other pulp production methods because the same kind of apparatus is used.
- The main explanation why the disc refiner has so far not been used in connection with the manufacture of dry paper is that the low humidity of the raw material of dry paper in comparison with other defibrated raw materials (for instance wood chips) seems to mean less steam generated and a smaller process pressure and therefore a decrease in the effect of the refiner. It should also be borne in mind that the manufacture of dry paper as a whole is still relatively new technology; for instance formers frequently constitute a quality bottleneck (tendency to form fibre lumps) in dry-paper machines that easily nullifies the benefits of a finer raw material (produced for instance with a disc refiner). In these circumstances there has been little incentive to think about ways of getting the raw material even finer, especially as it might have only aggravated the existing problems.
- Accordingly, the invention is based on the insight new to a person skilled in the art that it is both possible and economical to use a disc refiner in the manufacture of dry paper and that it is possible to construct the former so that it, for instance in continuous interaction with the defibration equipment, can fully utilize the defibration capacity of the disc refiner.
- Thus an advantageous embodiment of a system according to the invention is characterized by that it includes devices for conveying into the disc refiner for a new defibration the material that has been rejected or otherwise remained unscreened in the former.
- Other advantageous embodiments of a system according to the invention are characterized by what is presented in the patent claims below.
- In the following, the invention is explained in more detail by using an example, with reference being made to the attached drawing showing an embodiment of a system according to the invention.
- The figure shows a dry-paper machine's former unit 1, which has a rotating cylindrical
former drum 2 with a perforated mantle. The fibre material is fed through a pipe 3 into thedrum 2, which disperses the fibres into an even fibre web 9 on the wire running under the drum. In the example the fibre material is formed in accordance with the invention by shredding rolled chemical pulp 4 in apreshredder 5 and, sped up by ablower 7a, transporting it into adisc refiner 6 equipped with a feeding funnel and a conveyor screw, where the actual defibration occurs. Ablower 7b raises the pressure in the pipe 3 if the process pressure of the refiner is not enough for transporting the fibres into theformer drum 2. - Fibres and fibre flocks that have travelled through the
drum 2 are fed with ablower 7c through apipe 8 back into therefiner 6. In the figure is also seen a secondary circuit for the blast air of the drum, in which the air that has been sucked through the wire is returned with ablower 7d through apipe 10 to act as a cleaning jet over the drum. Thus all air and fibre material circuits in the system are essentially closed. - It is obvious to a person skilled in the art that the various embodiments of the invention are not restricted to the example presented above, but can be varied within the scope of the following patent claims. Accordingly, the refiner can be equipped with various accessories for instance for feeding arrangements or to control the steam generated in the process. And for a multiphase refining of the fibre material, the refiner can also have more than one phase.
Claims (2)
1. Feeding systems for the former of a dry-paper machine, in which feeding system the fibre material is disintegrated in such a form as required by the former, wherein the system comprises a shredder, in which the chemical pulp web gets preshredded, a disc refiner, in which the preshredded chemical pulp gets defibrated, and fibre material transport devices between the various parts of the system for a continuous feeding of the former.
2. System according to claim 1, the system including devices for conveying into the disc refiner for a new defibration the material that has been rejected or otherwise remained unscreened in the former.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI882400 | 1988-05-20 | ||
FI882400A FI81642C (en) | 1988-05-20 | 1988-05-20 | Feeder system for a molder by a dry paper machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0345234A2 true EP0345234A2 (en) | 1989-12-06 |
EP0345234A3 EP0345234A3 (en) | 1991-08-07 |
Family
ID=8526493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890850167 Withdrawn EP0345234A3 (en) | 1988-05-20 | 1989-05-19 | Feeding system for the former of a dry-paper machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0345234A3 (en) |
JP (1) | JPH02112500A (en) |
FI (1) | FI81642C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001054873A1 (en) * | 2000-01-28 | 2001-08-02 | Scan-Web I/S | Apparatus for dry-distributing of fibrous materials |
EP1177089A1 (en) * | 1999-04-09 | 2002-02-06 | BKI Holding Corporation | Distribution unit for dry forming of web material |
US6726461B2 (en) | 1999-05-27 | 2004-04-27 | Bki Holding Corporation | Screen pipe for dry forming web material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6855903B2 (en) * | 2017-04-24 | 2021-04-07 | セイコーエプソン株式会社 | Processing equipment and sheet manufacturing equipment |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1129695A (en) * | 1966-08-17 | 1968-10-09 | Mo Och Domsjoe Ab | Improvements in the disintegration of cellulose pulp |
DE1940953A1 (en) * | 1969-08-12 | 1971-04-08 | Heinrich Spoerl Spezialmaschin | Dry cellulose flake mfe |
DE2757581A1 (en) * | 1977-11-30 | 1979-05-31 | Escher Wyss Gmbh | WASTE DISPENSER PLANT WITH A DISPENSER FOR DISPOSING AND SORTING WASTE PAPER |
EP0032772A1 (en) * | 1980-01-18 | 1981-07-29 | Scanweb I/S | Apparatus for dry forming of paper or other sheet material of particles or fibres |
GB2096661A (en) * | 1981-04-10 | 1982-10-20 | Voith Gmbh J M | A process for preparing waste paper |
-
1988
- 1988-05-20 FI FI882400A patent/FI81642C/en not_active IP Right Cessation
-
1989
- 1989-05-19 EP EP19890850167 patent/EP0345234A3/en not_active Withdrawn
- 1989-05-20 JP JP12559089A patent/JPH02112500A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1129695A (en) * | 1966-08-17 | 1968-10-09 | Mo Och Domsjoe Ab | Improvements in the disintegration of cellulose pulp |
DE1940953A1 (en) * | 1969-08-12 | 1971-04-08 | Heinrich Spoerl Spezialmaschin | Dry cellulose flake mfe |
DE2757581A1 (en) * | 1977-11-30 | 1979-05-31 | Escher Wyss Gmbh | WASTE DISPENSER PLANT WITH A DISPENSER FOR DISPOSING AND SORTING WASTE PAPER |
EP0032772A1 (en) * | 1980-01-18 | 1981-07-29 | Scanweb I/S | Apparatus for dry forming of paper or other sheet material of particles or fibres |
GB2096661A (en) * | 1981-04-10 | 1982-10-20 | Voith Gmbh J M | A process for preparing waste paper |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1177089A1 (en) * | 1999-04-09 | 2002-02-06 | BKI Holding Corporation | Distribution unit for dry forming of web material |
EP1177089A4 (en) * | 1999-04-09 | 2002-08-07 | Bki Holding Corp | Distribution unit for dry forming of web material |
US6726461B2 (en) | 1999-05-27 | 2004-04-27 | Bki Holding Corporation | Screen pipe for dry forming web material |
WO2001054873A1 (en) * | 2000-01-28 | 2001-08-02 | Scan-Web I/S | Apparatus for dry-distributing of fibrous materials |
US7597200B2 (en) | 2000-01-28 | 2009-10-06 | Scan-Web I/S | Apparatus for dry-distributing of fibrous materials |
Also Published As
Publication number | Publication date |
---|---|
JPH02112500A (en) | 1990-04-25 |
FI882400A0 (en) | 1988-05-20 |
FI882400A (en) | 1989-11-21 |
FI81642B (en) | 1990-07-31 |
EP0345234A3 (en) | 1991-08-07 |
FI81642C (en) | 1990-11-12 |
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Effective date: 19920208 |