EP2751335A2 - Sieb ii - Google Patents
Sieb iiInfo
- Publication number
- EP2751335A2 EP2751335A2 EP12743978.4A EP12743978A EP2751335A2 EP 2751335 A2 EP2751335 A2 EP 2751335A2 EP 12743978 A EP12743978 A EP 12743978A EP 2751335 A2 EP2751335 A2 EP 2751335A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve
- screen according
- layer
- screen
- wear
- 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
- 239000007788 liquid Substances 0.000 claims description 7
- 235000011837 pasties Nutrition 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 239000002105 nanoparticle Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000011515 electrochemical drilling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- D21D5/16—Cylinders and plates for screens
Definitions
- the invention relates to a screen for the treatment of a liquid to pasty medium consisting of a plurality of layers and with a plurality of screen openings and a counter to the flow direction facing inlet side and a flow direction facing in the flow side.
- Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein. As a rule, they are rigid and differ from flexible endless screens used in screen presses and paper machines.
- Such screens should have a sorting characteristic z. B. by round openings between 0.8 and 30 mm, depending on the coarseness of the materials, is achievable.
- the object of the invention is therefore to ensure the most consistent sorting effect at constant throughput over the operating time.
- the object has been achieved in that the drainage side is formed by a layer with reduced adhesion.
- the adhesion of the layer with reduced adhesion is less than 60mJ / mm 2 and preferably between 15 and 30 mJ / mm 2 .
- Teflon, nanoparticles, plastics are particularly suitable for the realization of the layer with reduced adhesion.
- the inlet side of the screen is usually exposed to high wear, the inlet side should consist of a layer of very wear-resistant material.
- Particularly suitable for this purpose are ceramics, chromium or sintered metals such as tungsten carbide.
- the wear-resistant layer of the inlet side has a hardness between 800 and 2800HV (Vickers hardness).
- a base body for thin layers, it is advantageous if they are applied to a base body. This can be done for example by applying a layer in liquid or pasty form or by gluing or welding a film.
- the respective layer is exposed to a high load, it may be advantageous to form a robust and usually also relatively thick layer, if at least one layer of a separate screen layer is formed, the surface connected to a body, for example, is glued.
- the screen may be rigid or flexible. Furthermore, this also determines whether the sieve is flat or uneven, in particular designed as a cylinder.
- the inlet-side surface of the screen can be formed profiled. This is relatively easy to apply by welding beads or by laser. Because of its particular suitability for the treatment of liquid to pasty media, the use of the screen according to the invention is particularly advantageous for treating a pulp suspension suitable for producing a paper, board, tissue or other fibrous web or in wastewater treatment or in the food industry.
- Figures 1 to 3 show schematic partial cross sections through differently constructed sieves.
- the multilayer screens have a plurality of screen openings 1 arranged as uniformly as possible distributed with the same minimum cross-sectional area to ensure the same sorting effect.
- the cross-sectional area of all screen openings 1 is exemplified by a circle.
- Sieves which are to be used for the treatment of suspensions, must have a sufficient wall thickness for strength reasons.
- the z. B. between 0.8 and 30 millimeters, particularly favorable methods, such as punching or laser cutting, can be used. This usually causes less costs than boring.
- Further methods for producing the screen openings 1 are: milling, water jet cutting, etching, erosion, electrochemical drilling, flow hole forming or broaching.
- slots rectangles, diamonds, hexagons or other polygons with rounded corners.
- the sieve openings 1 can also increase towards the inlet 3 and / or the outlet side 4 of the sieve. Most all adjacent screen openings 1 have the same distance from each other, which ensures effective utilization of the screen surface with high stability.
- the screen openings 1 are often arranged in parallel rows.
- the sieve which is here by way of example, flows through the pulp suspension from the feed side 3 in the flow direction 2. Larger impurities are retained and can be removed on the inlet side 3, for example, with a reamer.
- the thickness of the screen in such applications is between 3 and 30 mm.
- the inlet side 3 of the screen is formed by a wear-resistant layer 5 of chromium, carbide or tungsten carbide.
- the hardness is in the range between 800 and 2800 HVA / ickershärte.
- the discharge side 4 is formed by a layer 6 with reduced adhesion, a so-called non-stick layer.
- the service life of the screen at constant operating parameters can be significantly extended.
- the effort to clean the screens can be omitted or reduced.
- the structure can vary accordingly.
- both layers 5, 6 were applied to a common basic body in the form of a middle layer 7. This is possible, for example, by the application of the layer 5, 6 in liquid or pasty form and subsequent hardening of the layers 5, 6.
- both layers 5, 6 cover the sieve alone, ie without intermediate middle layer 7 form.
- at least one layer 5, 6 should be in solid form, so that the other layer 6, 5 can be applied to it. If, as in FIG. 1, both layers 5, 6 are in solid form, they are connected to one another in a detachable or non-detachable manner to form the screen.
- the screen shown in Figure 2 has a stable layer 5 here in the form of the wear-resistant layer 5 of stainless steel, mild steel, Kunsstoff or a composite, so that the other layer 6 here in the form of non-stick layer 6, for example as a film on the stable layer. 5 is applied.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110081957 DE102011081957A1 (de) | 2011-09-01 | 2011-09-01 | Sieb II |
PCT/EP2012/065386 WO2013029931A2 (de) | 2011-09-01 | 2012-08-07 | Sieb ii |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2751335A2 true EP2751335A2 (de) | 2014-07-09 |
EP2751335B1 EP2751335B1 (de) | 2016-12-07 |
Family
ID=46639504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12743978.4A Active EP2751335B1 (de) | 2011-09-01 | 2012-08-07 | Sieb zur behandlung eines flüssigen bis pastösen mediums |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2751335B1 (de) |
CN (1) | CN204282111U (de) |
DE (1) | DE102011081957A1 (de) |
WO (1) | WO2013029931A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105126469A (zh) * | 2015-09-06 | 2015-12-09 | 成都易态科技有限公司 | 改性滤芯及其改性方法和应用 |
CN106049158A (zh) * | 2016-05-30 | 2016-10-26 | 许昌中亚工业智能装备股份有限公司 | 一种新型造纸机用过滤网 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1760694A1 (de) * | 1968-06-21 | 1971-03-11 | Kufferath Antonius | Siebgewebe und Verfahren zu seiner Herstellung |
US4601942A (en) * | 1984-08-10 | 1986-07-22 | Asten Group Inc. | Laminated soft faced-spiral woven papermakers fabric |
DE3909534A1 (de) * | 1989-03-22 | 1990-09-27 | Oberdorfer Fa F | Formiersieb fuer die nasspartie einer papiermaschine |
US5207873A (en) * | 1992-04-17 | 1993-05-04 | Huyck Corporation | Anti-contaminant treatment for papermaking fabrics |
DE4214061C2 (de) * | 1992-04-29 | 1995-02-16 | Escher Wyss Gmbh | Siebvorrichtung |
DE19547585A1 (de) * | 1995-12-20 | 1996-12-05 | Voith Sulzer Stoffaufbereitung | Verfahren zur Herstellung eines Siebelementes sowie nach diesem Verfahren hergestelltes Siebelement |
AT413110B (de) * | 2003-10-15 | 2005-11-15 | Andritz Ag Maschf | Sortierer |
-
2011
- 2011-09-01 DE DE201110081957 patent/DE102011081957A1/de not_active Withdrawn
-
2012
- 2012-08-07 EP EP12743978.4A patent/EP2751335B1/de active Active
- 2012-08-07 WO PCT/EP2012/065386 patent/WO2013029931A2/de active Application Filing
- 2012-08-07 CN CN201290000780.4U patent/CN204282111U/zh not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2013029931A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013029931A2 (de) | 2013-03-07 |
CN204282111U (zh) | 2015-04-22 |
EP2751335B1 (de) | 2016-12-07 |
DE102011081957A1 (de) | 2013-03-07 |
WO2013029931A3 (de) | 2013-08-15 |
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