WO2008131976A1 - Screen - Google Patents
Screen Download PDFInfo
- Publication number
- WO2008131976A1 WO2008131976A1 PCT/EP2008/051602 EP2008051602W WO2008131976A1 WO 2008131976 A1 WO2008131976 A1 WO 2008131976A1 EP 2008051602 W EP2008051602 W EP 2008051602W WO 2008131976 A1 WO2008131976 A1 WO 2008131976A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screen
- sieve
- recesses
- layers
- front side
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/16—Cylinders and plates for screens
Definitions
- the invention relates to a method for producing a sieve and a sieve for the treatment of a pulp suspension suitable for Faserstoffbahnerzeugung, which consists of at least two interconnected and apertures comprising sieve layers, wherein at least a portion of the apertures is arranged or is that through the Sieve leading sieve openings result.
- Such screens are preferably used for wet screening of pulp suspensions to remove impurities present therein.
- DE19547585 proposes a sieve with a support layer and a sorting layer.
- the object of the invention is therefore to simplify the production of sieves with recesses or their structure. According to the invention, the object is achieved in that a part of the openings is or is arranged so that arise on the front of the screen not through the sieve going recesses.
- the screen is made of three, four or more than four screen layers.
- the cross-sectional profile of the sieve openings if they extend, for example, starting from the front side in the direction of flow or obliquely, can be made more continuous with a greater number of sieve layers, i. with little or no jumps.
- the bonding of the screen layers should be as flat as possible and can be realized in particular by soldering, welding, screwing or gluing.
- the recesses form grooves or blind holes.
- the front side protruding Störelfn be fixed or be.
- the spoiler bars can additionally be fastened to the sieve, for example screwed on.
- This spoiler bars can support the für sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky sky .
- the screen layers themselves are formed as disruptive bodies with the openings forming the recesses. As a result, the attachment of interfering bodies, in particular spoiler bars completely eliminated.
- the recesses should form between 3 and 50%, preferably between 5 and 30%, of the surface of the screen in contact with the pulp suspension.
- the screening layer forming the front of the screen should have a higher wear resistance than other screen layers in the interests of long life.
- the screen layers have a thickness between 1 and 20 mm, preferably between 1 and 10 mm.
- the sieve has a total thickness of between 4 and 100 mm, preferably between 6 and 50 mm.
- the advantages in the production of the multi-layer sieve are optimally effective in comparison with sieves without sieve layers, if the sieve openings at the narrowest point have an extension between 1 and 20 mm, preferably between 4 and 20 mm.
- Application can find the invention in flexible, but especially in rigid screens.
- the screen layers should be made of the same material to minimize material cost and weight.
- Figure 1 a partial section through a sieve with Störance 5;
- FIG. 2 a plan view according to FIG. 1;
- FIG. 3 shows a partial section through another sieve with recesses 4 and FIG. 4 shows a plan view according to FIG. 3.
- the rigid, circular sieve of a sorter of an arrangement for processing a pulp suspension for a paper machine consists of several sieve layers 1.
- an unillustrated, rotating Sieblaker is arranged in the flow direction in front of the screen.
- screen layers 1 have a thickness between 1 and 5 mm and are soldered together. Before connecting the screen layers 1, however, perforations are punched into them, which form recesses 4 on the screen 2 coming into contact with the pulp suspension in front of the screen and continuous screen openings 3. While the recesses 4 in Figures 1 and 2 are formed only by the outer screen layer 1, this is done in the figures 3 and 4 by the outer two screen layers. 1
- the screen forming the front side 1 is made of a very wear-resistant material.
- the underlying screen layers 1 must ensure the stability of the screen and can in particular consist of cheaper and / or lighter material.
- the screen openings 3 have at the narrowest point an extension between 4 and 20 mm.
- the screen consists of three superimposed and two-dimensionally interconnected screen layers 1.
- the recesses 4 are formed as grooves in which spoiler bars 5 are inserted. These elongate spoiler bars 5 project beyond the front side 2 of the screen and are intended to reduce wear on the screen, generate turbulence, remove contaminants from the center and form working edges for deflaking. About the recesses 4, the spoiler bars 5 already get a secure fixation on the screen. To reinforce the spoiler bars 5 are still connected by screws 6 with the sieve.
- the sieve shown in FIGS. 3 and 4 consists of four superimposed sieve layers 1. Since the recesses 4 of two sieve layers 1 are formed here, they are also relatively deep.
- the recesses form between 5 and 30% of the surface of the front side 2 of the screen which comes into contact with the pulp suspension.
- This large extent of the recesses 4 makes it possible for the screen layers 1 to act as disruptive bodies themselves with the openings that form the recesses 4. In this way, the complex attachment of spoiler strips 5 can be omitted.
- the screen openings 3 can be found here in and outside of the recesses 4.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010504587A JP2010525186A (en) | 2007-04-30 | 2008-02-11 | screen |
BRPI0811018-2A2A BRPI0811018A2 (en) | 2007-04-30 | 2008-02-11 | SCREEN |
EP08708858A EP2152962A1 (en) | 2007-04-30 | 2008-02-11 | Screen |
CA002685390A CA2685390A1 (en) | 2007-04-30 | 2008-02-11 | Screen |
US12/608,141 US8123912B2 (en) | 2007-04-30 | 2009-10-29 | Screen |
US13/272,962 US8216428B2 (en) | 2007-04-30 | 2011-10-13 | Screen |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007020325.1 | 2007-04-30 | ||
DE102007020325A DE102007020325B3 (en) | 2007-04-30 | 2007-04-30 | Process for producing a screen for the treatment of pulp suspensions suitable for paper production |
DE102007000640.5 | 2007-11-07 | ||
DE102007000640 | 2007-11-07 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/608,141 Continuation US8123912B2 (en) | 2007-04-30 | 2009-10-29 | Screen |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008131976A1 true WO2008131976A1 (en) | 2008-11-06 |
WO2008131976A8 WO2008131976A8 (en) | 2010-04-01 |
Family
ID=39414940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/051602 WO2008131976A1 (en) | 2007-04-30 | 2008-02-11 | Screen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2152962A1 (en) |
CA (1) | CA2685390A1 (en) |
WO (1) | WO2008131976A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0651091A1 (en) * | 1993-10-28 | 1995-05-03 | Beloit Technologies, Inc. | Finely perforated undulating screen cylinder |
DE19547585A1 (en) * | 1995-12-20 | 1996-12-05 | Voith Sulzer Stoffaufbereitung | Sieving element |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2515808Y2 (en) * | 1990-10-01 | 1996-10-30 | 相川鉄工株式会社 | Paper strainer |
DE10065930B4 (en) * | 2000-12-22 | 2006-05-18 | Voith Paper Patent Gmbh | Method of making screens useful for wet screening of paper pulp suspensions |
-
2008
- 2008-02-11 WO PCT/EP2008/051602 patent/WO2008131976A1/en active Application Filing
- 2008-02-11 CA CA002685390A patent/CA2685390A1/en not_active Abandoned
- 2008-02-11 EP EP08708858A patent/EP2152962A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0651091A1 (en) * | 1993-10-28 | 1995-05-03 | Beloit Technologies, Inc. | Finely perforated undulating screen cylinder |
DE19547585A1 (en) * | 1995-12-20 | 1996-12-05 | Voith Sulzer Stoffaufbereitung | Sieving element |
Non-Patent Citations (1)
Title |
---|
See also references of EP2152962A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2152962A1 (en) | 2010-02-17 |
CA2685390A1 (en) | 2008-11-06 |
WO2008131976A8 (en) | 2010-04-01 |
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