WO2003052202A1 - A deflocculating means for use in a paper making machine - Google Patents
A deflocculating means for use in a paper making machine Download PDFInfo
- Publication number
- WO2003052202A1 WO2003052202A1 PCT/GB2002/001068 GB0201068W WO03052202A1 WO 2003052202 A1 WO2003052202 A1 WO 2003052202A1 GB 0201068 W GB0201068 W GB 0201068W WO 03052202 A1 WO03052202 A1 WO 03052202A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- deflocculating
- groove
- insert
- grooves
- cross
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
- D21F1/483—Drainage foils and bars
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/009—Fibre-rearranging devices
Definitions
- the present invention relates to a deflocculating means for use in a paper making machine.
- pulp stock which comprises a thin aqueous suspension of fibres and fillers is ejected from a headbox on to the surface of a moving endless screen belt called a forming fabric, which is made of woven metal wires or plastic filaments.
- the forming fabric passes over various fabric support devices to withdraw the water to leave a thin formation of matted fibres that is lifted off the fabric and subsequently treated, ultimately to produce a finished sheet of paper.
- the quality of the finished paper depends to a large extent on the uniformity of the fibre suspension in the pulp stock being maintained during the dewatering process which occurs on the forming fabric.
- means are conventionally employed to create micro-turbulence in the pulp stock on the forming fabric to prevent the fibres in the pulp from agglomerating and forming floes .
- Typical deflocculating means comprise forming boards or foil blades which are located beneath the forming fabric to interrupt the drainage of water and cause the development of pressure pulses in the pulp stock.
- a forming board is described in British patent GB 2190932, which describes a board with an upper surface comprising one or more transverse slots .
- the depth of the or each slot can be varied by the location in the slot of a slat.
- a plurality of slats of varying thickness is provided so that the depth of the slot in the board can be adjusted according to the thickness of the slat used. In this way, the forming board can be readily adapted to produce the requisite degree of turbulence required.
- the object of the present invention is to provide a deflocculating means for use in a paper making machine which provides an improvement in the tear strength of the resulting paper over the aforementioned conventional means described above.
- the upper surface of the support member defines a plurality of grooves running in a cross-machine direction.
- the grooves may run parallel to one another across the surface but alternatively they can be arranged so that leading ends of the grooves with respect to the direction of travel of the belt are located on opposite sides of the support surface.
- the insert changes the depth of the groove.
- the insert may project above the level of the support surface so that if a plurality of grooves are arranged adjacent one another across the support surface, the inserts define a series of cross-machine channels therebetween.
- the upper surface of the insert is flat.
- the upper surface of the insert has a downstream portion which diverges backwards at an angle between 0° and 5°.
- the trailing side walls of the grooves are angled so that they slope in the direction of travel of the belt at an angle which diverges by up to 45° from the vertical .
- the leading edge of the support member diverges downwardly from the support surface at an angle of 30°.
- the retaining means is provided by the groove defining a T-shaped or dovetail-shaped transverse cross-sectional profile into which a complementary shaped insert can be slidingly engaged from one end of the groove.
- the support member may comprise a forming board. Alternatively, it may comprise a foil blade.
- Fig. 1 is a perspective view from one side of a forming board according to the present invention
- Fig. 2 is a side elevation of a insert for use in conjunction with the forming board shown in Fig. 2;
- Fig. 3 is a plan view of the board shown in Fig. 1 but to a reduced scale
- Fig. 4 is a side elevation of the board shown in Fig. 3 with three different inserts located therein.
- a forming board 1 comprises substantially flat, rectangular upper support surface 3 and a lower surface 3. Each of the surfaces 2 and 3 defines a series of grooves 4 and 5 respectively.
- the board 1 is also provided with a leading edge 6 and a trailing edge 7, with respect of the direction of travel B of a forming fabric belt beneath which it is to be located in a paper making machine. As is conventional, the leading edge 6 of the board 1 diverges downwardly from the upper surface 2 at an angle a of around 30° .
- Both sets of grooves 4 and 5 are open ended and run across the board 1 in a cross-machine direction with regard to the direction of travel B of the forming fabric.
- the cross-sectional profiles of the grooves 5 in the lower surface are T-shaped uniformly along the length of the groove to enable the board 1 to be attached in a conventional fashion to T-shaped cross-rails mounted on a frame located beneath the forming fabric belt.
- the grooves 4 in the upper surface 2 of the board 1 also have a uniform T-shaped transverse cross-sectional profile to provide a retaining means for an insert 8 in the form of a complementarily shaped slat that can be slidingly engaged in the groove 4 from one end thereof.
- the grooves 4 need not have a T-shaped profile, other profiles also being suitable to provide the retaining means, for example a dovetail-shaped profile.
- the grooves 4 in the upper surface 2 have a longitudinal axis which is angled at between 0.38° and 0.77° to a transverse axis in the cross-machine direction.
- forming boards 1 have a width which varies between 2000 mm and 11000 mm, this means that there will be an approximate variation of between 13 mm and 148 mm between the distance of the leading end 9 of the leading edge 10 of the groove 4 from the leading edge 6 of the board 1 and the distance of the trailing end 11 of the leading edge 10 of the groove 4 from the leading edge 6 of the board 1. This variation is indicated in Fig.
- grooves 4 are shown in the forming board 1 which are all arranged parallel to one another, the grooves 4 need not be arranged in this fashion.
- the numbers of grooves 4 in the board 1 can be varied as required.
- the grooves 4 will lie at oblique angles to one another across support surface 2 of the board 1.
- the adjacent grooves 4 of a series can be arranged to run obliquely to one another.
- the inserts 8 provided for sliding engagement in the grooves 4 may either change the depth of the groove 4 by being of a smaller depth than the depth of the groove 4 or may project above the level of the support surface 2. In the latter case, if a plurality of parallel grooves 4 are arranged adjacent one another across the support surface, the inserts 8 will define a series of cross-machine channels therebetween. It will be appreciated that in essence this will produce the same effect as the use of the inserts 8 in the former case where the grooves 4 themselves define the cross-machine channels.
- inserts 8 may also be provided which are the same depth as the depth of the grooves 4, effectively to blank out any grooves 4 in the board 1 which may not be required for a particular application.
- the upper surface of the inserts 8 is preferably smooth and flat.
- some inserts 8, such as the insert shown in Fig. 2 may have an upper surface 12 that has a downstream portion 13 which diverges backwards at an angle b between 0° and 5°.
- the trailing edges 14 of the grooves 4 may angled so that they slope in the direction of travel of the belt at an angle which diverges by up to 45° from the vertical, as shown in Fig. 1.
- the forming board 1 is mounted conventionally beneath a forming fabric belt in a paper making machine.
- the cross-machine channels defined by the board 1 by the combination of the grooves 4 and inserts 8 induce pressure pulses in the pulp stock. This occurs principally by forcing water which has draining from the stock through the forming fabric back through the fabric into the pulp.
- the cross-machine channels will be encountered first at their leading ends 9 at one side of the fabric.
- a forming board 1 as described above may be made from any suitable material, which is easy to machine and will withstand wear. Particularly suitable for the purpose are machinable plastics materials, such as high density polyethylene, as they will not be corroded by the water draining out from the pulp stock.
- both forming boards and foil blades can be adapted in accordance with the present invention. Whilst a forming board has been used in the example given above to demonstrate the invention, a man skilled in the art will appreciate that a foil blade in accordance with the invention could be readily manufactured.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02703759A EP1454011A1 (en) | 2001-12-14 | 2002-03-08 | A deflocculating means for use in a paper making machine |
AU2002237442A AU2002237442A1 (en) | 2001-12-14 | 2002-03-08 | A deflocculating means for use in a paper making machine |
US10/498,386 US20050092454A1 (en) | 2001-12-14 | 2002-03-08 | Deflocculating means for use in a paper making machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0129900A GB2383054B (en) | 2001-12-14 | 2001-12-14 | A deflocculating means for use in a paper making machine |
GB0129900.7 | 2001-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003052202A1 true WO2003052202A1 (en) | 2003-06-26 |
Family
ID=9927599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2002/001068 WO2003052202A1 (en) | 2001-12-14 | 2002-03-08 | A deflocculating means for use in a paper making machine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050092454A1 (en) |
EP (1) | EP1454011A1 (en) |
AU (1) | AU2002237442A1 (en) |
GB (1) | GB2383054B (en) |
WO (1) | WO2003052202A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0311802D0 (en) * | 2003-05-22 | 2003-06-25 | Perplas Ltd | Apparatus |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2928465A (en) * | 1959-04-27 | 1960-03-15 | Ontario Paper Co Ltd | Drainage element for paper machines |
US3027941A (en) * | 1959-11-24 | 1962-04-03 | Lodding Engineering Corp | Fourdrinier white water doctor box |
US4420370A (en) * | 1982-07-19 | 1983-12-13 | Jwi Ltd. | Pulp agitating device and method having multiple protruding inserts |
GB2190932A (en) * | 1986-05-27 | 1987-12-02 | Michael John Morley | Forming boards |
US5562807A (en) * | 1995-03-03 | 1996-10-08 | Baluha; Mark R. | Cross direction fiber movement and dewatering device |
DE19730232A1 (en) * | 1997-07-15 | 1999-01-21 | Wanke Wilhelm Dipl Ing Fh | Process for producing fibrous webs, preferably paper or cardboard, using hydrodynamic suspension shaking, and devices therefor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3232825A (en) * | 1963-09-16 | 1966-02-01 | Time Inc | Dual wire type paper-forming apparatus and methods of forming and dewatering paper |
-
2001
- 2001-12-14 GB GB0129900A patent/GB2383054B/en not_active Expired - Lifetime
-
2002
- 2002-03-08 EP EP02703759A patent/EP1454011A1/en not_active Withdrawn
- 2002-03-08 US US10/498,386 patent/US20050092454A1/en not_active Abandoned
- 2002-03-08 WO PCT/GB2002/001068 patent/WO2003052202A1/en not_active Application Discontinuation
- 2002-03-08 AU AU2002237442A patent/AU2002237442A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2928465A (en) * | 1959-04-27 | 1960-03-15 | Ontario Paper Co Ltd | Drainage element for paper machines |
US3027941A (en) * | 1959-11-24 | 1962-04-03 | Lodding Engineering Corp | Fourdrinier white water doctor box |
US4420370A (en) * | 1982-07-19 | 1983-12-13 | Jwi Ltd. | Pulp agitating device and method having multiple protruding inserts |
GB2190932A (en) * | 1986-05-27 | 1987-12-02 | Michael John Morley | Forming boards |
US5562807A (en) * | 1995-03-03 | 1996-10-08 | Baluha; Mark R. | Cross direction fiber movement and dewatering device |
DE19730232A1 (en) * | 1997-07-15 | 1999-01-21 | Wanke Wilhelm Dipl Ing Fh | Process for producing fibrous webs, preferably paper or cardboard, using hydrodynamic suspension shaking, and devices therefor |
Also Published As
Publication number | Publication date |
---|---|
EP1454011A1 (en) | 2004-09-08 |
AU2002237442A1 (en) | 2003-06-30 |
GB2383054B (en) | 2005-02-16 |
GB2383054A (en) | 2003-06-18 |
GB0129900D0 (en) | 2002-02-06 |
US20050092454A1 (en) | 2005-05-05 |
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