WO1998009019A1 - Siebpartie für eine papiermaschine - Google Patents
Siebpartie für eine papiermaschine Download PDFInfo
- Publication number
- WO1998009019A1 WO1998009019A1 PCT/DE1997/001795 DE9701795W WO9809019A1 WO 1998009019 A1 WO1998009019 A1 WO 1998009019A1 DE 9701795 W DE9701795 W DE 9701795W WO 9809019 A1 WO9809019 A1 WO 9809019A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- belt
- sieve
- loop
- profile
- screen
- 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
- D21F1/52—Suction boxes without rolls
- D21F1/523—Covers thereof
- D21F1/526—Covers thereof consisting of endless moving belts
-
- 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
- D21F1/30—Protecting wire-cloths from mechanical damage
Definitions
- the invention relates to a wire section for a paper machine, with an endless, rotating wire belt.
- This wraps around a series of rollers, namely a so-called breast roller, which is arranged at the beginning of the upper run, also a deflection roll, which is located on the lower run, and several guide rolls, which are wrapped by the return run and partly lie within the sieve loop, partly outside.
- a headbox is assigned to the screen belt, which feeds a machine-wide jet of a fiber suspension in the area of the breast roll onto the screen.
- Screen sections for paper machines can be formed from a single screen belt. One then speaks of a fourdrinier sieve. But they can also be formed from two sieves, which together form a sheet formation zone in which the fibrous suspension is encased, and thus releases water through both sieves.
- Double screens are not subject to any restrictions in this regard. They can have a horizontal sheet formation zone, but also an ascending or descending sheet formation zone.
- dewatering elements within the sheet formation zone.
- These drainage elements are used for climbing natural drainage.
- Such elements include, for example, so-called register rollers, which support the screen in the sheet formation area, also so-called foils, over which the screen grinds, and which, due to their design, have a suction effect on the screen and thus on the fibrous web that forms.
- the drainage elements mentioned have u. a.
- the invention is based on the object of designing a wire section of a paper machine in such a way that, within the sheet formation zone, the most uniform possible dewatering of the fiber suspension or paper sheet being formed on the wire over the machine width is achieved.
- a further band is provided within the sheet formation zone, hereinafter referred to as "profile band” due to its advantageous influencing of the transverse profile of the resulting paper web, by means of as uniform a dewatering of the fiber suspension over the sieve side as possible.
- This is located at least partially in the loop of the sieve of the sieve section or the sieves, if it is a double sieve.
- the profile band is also an endless band. In general, it will also be driven, just like the screen belt itself. It is very important that it has a uniform porosity that is defined over the width, but is lower than that of the screen belt running over it. This eliminates the screen errors that also lead to profile errors.
- DE-AS 22 19 302 It is also known from DE-AS 22 19 302 to run a felt belt as the second belt within the sheet formation zone, which has higher capillary forces than the wire belt as well as a sufficient storage capacity for the amount of water drawn off and its water content in the returning run by means of and / or irrigation devices is controlled. Furthermore, it is known from DE-PS 577 195 to allow a scraper belt to run as a second belt within the sheet formation zone, which streaks at a different speed or direction of movement than the wire belt. This also does not solve the stated task of achieving as uniform a drainage as possible across the width of the machine. len.
- the profiled belt is arranged entirely within the loop of the sieve belt and circulates in the same direction.
- the profile belt has a run that runs parallel to the working run of the screen belt within the sheet formation zone.
- the loop of the profile strip can also be arranged such that the two loop axes are perpendicular to each other.
- the profile belt does not necessarily have to be driven. If it is driven, it can run at the same speed as the screen belt, or at a lower speed, or at a higher speed than this.
- the profile belt can have a certain finite distance from the screen belt in the area of the sheet formation zone. However, it can also touch the screen belt on its side facing away from the paper stock.
- a negative pressure can be applied to the profile strip in the area within the sheet formation zone.
- the profile tape can be made of any flexible material, i.e. sheet metal, plastic, rubber and other materials. It is more or less open through holes or slits. It can also have a rough, ribbed or otherwise profiled outer surface facing the sieve belt. In this case it can be impermeable.
- the profile tape can be absolutely the same across its width with regard to all parameters such as thickness, material properties, permeability, hole or slot arrangement and width. With regard to such parameters, however, a middle region can also be designed differently than in its edge regions.
- the sheet profiling can be carried out by permeability that varies across the width.
- the profiled belt takes on a partial function of today's drainage screen with the drainage elements underneath. It has a lower permeability than today's sieve and has a uniform or uneven perforation or profiling according to the profile requirements. Since this is not a fabric, it can be perforated accordingly. This allows the drainage to be controlled. This is further supported by the control of its drive, which is independent of the belt speed.
- the profiled belt can be equipped with ribs or knobs in order to create a distance from the sieve, at the same time supporting it. The profile belt can be cleaned and cleaned during operation. The remaining sieve The tape for storing the nonwoven fabric has a simple function for this remaining task.
- FIG. 3b a top view of the object of Fig. 3a
- Fig. 4b a plan view of the object of Fig. 4a
- FIG. 5 an overall view of a machine with a wire section as in FIG. 1.
- the sieve belt 1 is a machine-wide material strand 8 from the Headbox nozzle 2.1 supplied.
- the headbox 2 is also associated with a known, continuous distributor 3. This has a central inlet 3.1, through which it contains stock suspension from below, and a plurality of radially arranged outlets 3.2, which are connected to the headbox 2 via flexible lines 3.3.
- headbox is only to be understood as the so-called “residue headbox", consisting of a machine-wide forming chamber which contains turbulence and ends with the headbox nozzle.
- a profiled belt 4 is provided within one of the sheet formation zones which adjoins the headbox nozzle 2.1 in the direction of the belt run. This wraps around a series of guide rollers 4.1, 4.2, 4.3.
- the profile band 4 has a plurality of holes or holes 4.5, which are, however, not recognizable from this figure.
- the profile belt loop is wrapped in the sieve belt loop.
- Bei ⁇ e Bander namely the sieve belt 1 and the profile belt 4 are driven in the same direction.
- the two bands run parallel to one another.
- drainage boxes 5.1, 5.2 are also provided within the sheet formation zone. These can be vacuumed.
- the embodiment shown in Fig. 2 also has a profile band 4 within the sheet formation zone. This is provided with numerous holes 4.5.
- the loop of the profiled belt 4 is arranged transversely to the loop of the sieve belt 1 here.
- the distributor 3 and headbox 2 are designed similarly to that in FIG.
- the profile belt is again arranged as in the embodiment according to FIG. 2. From FIG. 4b it can be seen that the profile belt 4 projects beyond the lateral edges 1.3 of the screen belt 1 because the guide rollers 4.1, 4.2 of the profile strip 4 are located outside of this edge.
- FIGS. 1, 3a and 3b shows an overall side view of the embodiment according to FIGS. 1, 3a and 3b, it can be seen that within the sheet formation zone three drainage boxes 5.1, 5.2, 5.3 are provided, which drain downwards, and also a drainage box 5.4 which lies in an upper sieve belt 7 and which drains upwards.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU42940/97A AU4294097A (en) | 1996-08-26 | 1997-08-21 | Screen section for a paper machine |
EP97918890A EP0922135A1 (de) | 1996-08-26 | 1997-08-21 | Siebpartie für eine papiermaschine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996134349 DE19634349C2 (de) | 1996-08-26 | 1996-08-26 | Siebpartie für eine Papiermaschine |
DE19634349.6 | 1996-08-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998009019A1 true WO1998009019A1 (de) | 1998-03-05 |
Family
ID=7803659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/001795 WO1998009019A1 (de) | 1996-08-26 | 1997-08-21 | Siebpartie für eine papiermaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0922135A1 (de) |
AU (1) | AU4294097A (de) |
DE (1) | DE19634349C2 (de) |
WO (1) | WO1998009019A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19823948A1 (de) | 1998-05-28 | 1999-12-02 | Voith Sulzer Papiermasch Gmbh | Endloses Band |
DE19957625A1 (de) * | 1999-11-30 | 2001-05-31 | Voith Paper Patent Gmbh | Noppenband |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2829567A (en) * | 1954-03-24 | 1958-04-08 | Escher Wyss Gmbh | Apparatus for drying webs of pulp on sieves of drying machines |
GB907413A (en) * | 1959-04-13 | 1962-10-03 | Milton Joseph Maguire | Paper making machine |
US3340141A (en) * | 1963-10-14 | 1967-09-05 | Raybestos Manhattan Inc | Belt for suction box of a paper machine |
DE2204751A1 (de) * | 1972-02-02 | 1973-08-23 | Schuller Gmbh Glaswerk | Verfahren und vorrichtung zur reinigung der schlitzsauger-duesen von impraegniereinrichtungen oder dgl. an faserbahnen erzeugenden anlagen |
GB1496026A (en) * | 1975-06-04 | 1977-12-21 | Evans & Son Ltd W P | Apparatus for the removal of moisture from material in continuous web form |
US4780184A (en) * | 1985-10-22 | 1988-10-25 | Tamfelt Oy Ab | Method for the adjustment of the dewatering in the wire section of a paper machine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE63665C (de) * | F. W. ANDREAS in Coswig i. A | Saugkasten für Papiermaschinen | ||
DE577195C (de) * | 1932-01-31 | 1933-05-29 | J M Voith Fa | Vorrichtung zur Entwaesserung von Papier, Holz- oder Zellstoff auf Langsiebmaschinen mit unter dem Sieb liegendem Abstreifer |
DE2219302B2 (de) * | 1972-04-20 | 1974-05-09 | J.M. Voith Gmbh, 7920 Heidenheim | Langsieb-Papiermaschine |
-
1996
- 1996-08-26 DE DE1996134349 patent/DE19634349C2/de not_active Expired - Fee Related
-
1997
- 1997-08-21 EP EP97918890A patent/EP0922135A1/de not_active Withdrawn
- 1997-08-21 AU AU42940/97A patent/AU4294097A/en not_active Abandoned
- 1997-08-21 WO PCT/DE1997/001795 patent/WO1998009019A1/de not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2829567A (en) * | 1954-03-24 | 1958-04-08 | Escher Wyss Gmbh | Apparatus for drying webs of pulp on sieves of drying machines |
GB907413A (en) * | 1959-04-13 | 1962-10-03 | Milton Joseph Maguire | Paper making machine |
US3340141A (en) * | 1963-10-14 | 1967-09-05 | Raybestos Manhattan Inc | Belt for suction box of a paper machine |
DE2204751A1 (de) * | 1972-02-02 | 1973-08-23 | Schuller Gmbh Glaswerk | Verfahren und vorrichtung zur reinigung der schlitzsauger-duesen von impraegniereinrichtungen oder dgl. an faserbahnen erzeugenden anlagen |
GB1496026A (en) * | 1975-06-04 | 1977-12-21 | Evans & Son Ltd W P | Apparatus for the removal of moisture from material in continuous web form |
US4780184A (en) * | 1985-10-22 | 1988-10-25 | Tamfelt Oy Ab | Method for the adjustment of the dewatering in the wire section of a paper machine |
Also Published As
Publication number | Publication date |
---|---|
AU4294097A (en) | 1998-03-19 |
DE19634349A1 (de) | 1998-03-05 |
EP0922135A1 (de) | 1999-06-16 |
DE19634349C2 (de) | 1999-04-01 |
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