EP2780505A1 - Sieb - Google Patents
SiebInfo
- Publication number
- EP2780505A1 EP2780505A1 EP12779044.2A EP12779044A EP2780505A1 EP 2780505 A1 EP2780505 A1 EP 2780505A1 EP 12779044 A EP12779044 A EP 12779044A EP 2780505 A1 EP2780505 A1 EP 2780505A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve
- screen
- slot
- openings
- shaped screen
- 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.)
- Granted
Links
- 239000000725 suspension Substances 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000835 fiber Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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
- D21D5/023—Stationary screen-drums
- D21D5/026—Stationary screen-drums with rotating cleaning foils
-
- 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 sieve for treating a suspension having a multiplicity of slot-shaped sieve openings.
- the invention also relates to a method for producing a screen with slot-shaped screen openings.
- Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein.
- they are rigid and differ from flexible endless screens used in screen presses and paper machines.
- the object of the invention is therefore to improve the sorting effect and / or throughput while ensuring the required screen stability.
- this object is achieved in that at least one, a plurality of slot-shaped screen openings comprehensive section of the screen in one piece
- the one-piece design because of the lack of dividing lines within the respective section of the screen surface ensures the required strength of the section or of the screen at all. This high strength in turn allows the increase of the open screen area and thus the throughput.
- slots are formed with and between parallel screen bars.
- this is relatively expensive to manufacture and, on the other hand, limits the achievable open screen area while ensuring high strength.
- the profiled screen front creates turbulence in the suspension and thus significantly improves the sorting effect and the throughput, which has a positive effect on the
- Siebvorderseite here the side of the sieve is considered, from which the suspension flows through the sieve.
- the open screen area of the section is between 15 and 25%.
- the positive effects of the invention can then be used extensively if the entire sieve, in particular the entire perforated sieve surface is integrally formed.
- the profile depth of the front side of the screen is between 0.5 and 3 mm
- the thickness of the screen between 2 and 8 mm, preferably between 4 and 6 mm and / or the web width between adjacent slot-shaped screen openings should be greater than 0.3 mm, and preferably between 1 and 5 mm.
- the cross section of the slot-shaped screen openings lying perpendicular to the flow direction has at least one round section or only straight sections.
- the throughput can also be increased by the fact that at least a portion of the slot-shaped screen openings at least a section opens into a survey of the profile of the Siebvorderseite and / or at least in part of the slot-shaped screen openings, the height of the mouth on the Siebvorderseite in the longitudinal direction of the slot changed. This not only creates further turbulence in the suspension but also improves the absorption capacity of the mouths.
- the screen may be flat or designed as a cylinder, wherein the slot-shaped screen openings preferably approximately parallel to
- the use of the invention is particularly suitable for the treatment of one, for the production of a paper, board, tissue or another
- At least the one-piece section of the screen preferably the entire screen should be made of metal.
- the slot-shaped screen openings should have a width between 0.1 and 1.0 mm, preferably between 0.1 and 0.45 mm.
- the thickness of the screen should be less than 20 mm.
- Mouth area which can already be enough for many cases.
- Siebrückseite ago can be easily realized.
- the angle between a straight line through the sieve front-side beginning and the siebschreib existede end of the wall of the sieve opening and the flow direction between 1 and 8 °, preferably between 3 and 5 °.
- the expansion of the sieve opening counteracts blockage, but is so small that the strength of the sieve is not significantly affected.
- FIG. 1 shows a schematic cross section through a pressure sorter
- FIG. 2 shows a schematic cross section through a pulper
- Figure 5 a-d screen openings with different cross-section.
- FIG. 1 shows a pressure sorter according to the invention with a one-piece, metallic screen 2, here in the form of a cylindrical screen basket with a vertical cylinder axis 10, which divides the interior of the pressure sorter into an inlet space 8 and an accepts space 9.
- the pulp suspension 1 is fed via a suspension feed.
- the pulp suspension 1 receives an angular momentum which causes it to move circumferentially. In addition to this, due to the applied pressure gradient between the above drawn
- Suspension feed 1 1 and the underlying Rejektauslauf 12 of the inlet chamber 8 generates a transport flow.
- the rejected from the screen 2 part of the pulp suspension 1 is conveyed as a reject 18 via the Rejektauslauf 12 from the feed chamber 8.
- a known Sieblaker is used, which moves relative to the wire 2.
- this sieve scraper is formed by a rotor 6 rotating in the screen 2 with rotor blades 15 attached thereto.
- the rotor 6 has the shape of a cylindrical drum, wherein the axis of rotation 7 coincides with the cylinder axis 10.
- All rotor blades 15 in this case have the same shape, which leads to a uniform effect on the pulp suspension 1 and the wire 2.
- the rotor blades 15 are arranged distributed over a plurality of perpendicular to the axis of rotation 7 extending circumferential planes of the rotor 6.
- the sieve surface comprises a multiplicity of sieve openings 3 arranged as uniformly as possible with the same minimum cross-sectional area in the direction of flow 5 to ensure the same sorting effect.
- the open screen area of the screen 2 is between 15 and 25%.
- the sum of the smallest flow cross-sections through the sieve 2 relative to the respective perforated sieve surface is considered as open sieve surface.
- a pulper in Figure 2, in the container 16, a suspension 1 of pulp and water is formed.
- the suspension is 1 from a front of a sieve 2 at the bottom of the container 16 rotating rotor 6 mixed.
- the rotor 6 generates in front of the screen 2 a rotational flow, which improves the sorting effect and the passage.
- the screen 2 which is an example here, is flowed through by the pulp suspension 1 from the front of the sieve 4. Larger impurities are thereby.
- the suspension 1 can be collected and removed under the sieve 2.
- the longest extent of the slots in the sieve 2 is approximately perpendicular to the rotational flow 14 of the suspension 1 generated by the rotor 6 in front of the sieve 2.
- the thickness of the screen 2 is between 4 and 6 mm, the
- slot-shaped screen openings 3 a width of 0.1 to 0.45 mm and a length between 10 and 100 mm.
- the screen 2 in addition to this micro-profile, the screen 2, as shown in Figure 4, or Makroprofile in the form of grooves o.ä. having a tread depth between 1, 2 and 3 mm or more.
- the screen openings 3 on the Siebvorderseite 4th partially or wholly in the sinks or even in the surveys of the macro-profile.
- This variety of mouth design also extends the sorting characteristics of the screen openings 3 and also has more turbulence in the suspension 1 result.
- all adjacent screen openings 3 on the long sides of the slots have the same distance from one another, which ensures effective utilization of the screen surface with high stability.
- the screen openings 3 are arranged in parallel rows, wherein the web width between the, on the long sides adjacent slot-shaped screen openings 3 is approximately between 1 and 5 mm.
- FIGS. 5a-d show possibilities of slit design of the screen openings 3.
- the slots are formed by only a single straight section.
- Sections, wherein the sections form an obtuse angle are arranged offset from each other.
- the slots in FIG. 5c are formed exclusively by round sections.
- the water jet cutting allows the introduction of narrow slits even in such a thick, metallic screens 2. As a result, a large open screen surface generated and also counted because of the one-piece with a high strength of the screen 2 become.
- a conical or trumpet-shaped widening of the screen openings 3 in the flow direction 5, as shown in Figure 4, can be with the
- the angle 19 between a straight line through the sieve front-side beginning and the siebrück workede end of the wall of the sieve opening 3 and the flow direction 5 is between 3 and 5 °.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011086428A DE102011086428A1 (de) | 2011-11-16 | 2011-11-16 | Sieb |
DE202011108856U DE202011108856U1 (de) | 2011-11-16 | 2011-12-06 | Sieb |
PCT/EP2012/071140 WO2013072174A1 (de) | 2011-11-16 | 2012-10-25 | Sieb |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2780505A1 true EP2780505A1 (de) | 2014-09-24 |
EP2780505B1 EP2780505B1 (de) | 2019-09-11 |
Family
ID=45805113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12779044.2A Active EP2780505B1 (de) | 2011-11-16 | 2012-10-25 | Sieb |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2780505B1 (de) |
CN (1) | CN103930617B (de) |
DE (2) | DE102011086428A1 (de) |
ES (1) | ES2751461T3 (de) |
PT (1) | PT2780505T (de) |
WO (1) | WO2013072174A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014013650A1 (de) * | 2014-09-19 | 2016-03-24 | Siebtechnik Gmbh | Siebbelag und Verfahren zur Herstellung eines Siebbelages |
CN105317702A (zh) * | 2015-10-28 | 2016-02-10 | 泉州市永茂电子科技有限公司 | 一种远程控制水泵 |
DE102016202586A1 (de) * | 2016-02-19 | 2017-08-24 | Voith Patent Gmbh | Stofflöser |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2086271U (zh) * | 1991-03-12 | 1991-10-09 | 邱俊雄 | 用于筛选机的圆筒形筛板 |
FI89521C (fi) * | 1991-10-04 | 1993-10-11 | Cae Investments Bv | Foerfarande foer framstaellning av en silprodukt och genom foerfarandet framstaelld silprodukt |
US5607589A (en) * | 1995-06-06 | 1997-03-04 | Cae Screenplates Inc. | Multiple contour screening |
SE507471C2 (sv) * | 1996-08-09 | 1998-06-08 | Sunds Defibrator Ind Ab | Silpanel samt sätt för dess framställning |
EP2547824B1 (de) * | 2010-03-16 | 2018-07-18 | Tampulping OY | Druckfilter |
-
2011
- 2011-11-16 DE DE102011086428A patent/DE102011086428A1/de not_active Withdrawn
- 2011-12-06 DE DE202011108856U patent/DE202011108856U1/de not_active Expired - Lifetime
-
2012
- 2012-10-25 ES ES12779044T patent/ES2751461T3/es active Active
- 2012-10-25 CN CN201280056502.5A patent/CN103930617B/zh active Active
- 2012-10-25 WO PCT/EP2012/071140 patent/WO2013072174A1/de active Application Filing
- 2012-10-25 EP EP12779044.2A patent/EP2780505B1/de active Active
- 2012-10-25 PT PT127790442T patent/PT2780505T/pt unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2013072174A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2780505B1 (de) | 2019-09-11 |
PT2780505T (pt) | 2019-11-27 |
CN103930617A (zh) | 2014-07-16 |
ES2751461T3 (es) | 2020-03-31 |
DE202011108856U1 (de) | 2012-01-20 |
WO2013072174A1 (de) | 2013-05-23 |
CN103930617B (zh) | 2017-02-22 |
DE102011086428A1 (de) | 2013-05-16 |
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