EP2815024A1 - Sieb für eine maschine zur herstellung einer faserstoffbahn - Google Patents
Sieb für eine maschine zur herstellung einer faserstoffbahnInfo
- Publication number
- EP2815024A1 EP2815024A1 EP13700745.6A EP13700745A EP2815024A1 EP 2815024 A1 EP2815024 A1 EP 2815024A1 EP 13700745 A EP13700745 A EP 13700745A EP 2815024 A1 EP2815024 A1 EP 2815024A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- machine direction
- machine
- cross
- yarns
- sieve
- 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.)
- Withdrawn
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
- D21F1/0027—Screen-cloths
- D21F1/0036—Multi-layer screen-cloths
- D21F1/0045—Triple layer fabrics
Definitions
- the invention relates to a screen, in particular a forming fabric for a machine for producing a fibrous web, in particular a paper, board or packaging paper web, according to the preamble of claim 1 with a BrumaterialKeyseite providing first fabric layer and a machine contact page providing second fabric layer by Binding threads are connected together.
- the friction engagement surface -this is the area that provides the abrasive bulk of the screen-a screen provided essentially by machine-side cross-machine yarns, often called "shot-type" ones, which have a thick diameter relative to the other threads of the screen
- the disadvantage of this design is that the cross-machine direction yarns run transversely to the direction of travel of the wire and thereby provide a large contact surface for elements such as suction boxes, a long run time, while protecting the machine-side machine direction yarns which have to absorb the majority of the tension acting on the wire.
- Forming strips and the like in the PM offers, which causes an excessive load bearing, which should be prevented for economic and environmental reasons.
- the frictional engagement surface of a screen is substantially defined by the machine-side machine direction threads provided, ie the dewatering elements of the paper machine have substantially only contact with the machine-side machine direction threads.
- Such an embodiment is often referred to as a "warp runner.”
- the advantage of this solution is a lower load bearing capacity compared to the "weft runner”.
- the disadvantage of this solution is that the machine-side machine direction yarns are not sufficiently available for the abrasion, as these must take over the wire tension as described above and therefore the cross section of the machine-side machine direction yarns must always remain so large that there is no demolition of the screen in the paper machine can come.
- the abrasion volume available by the machine-side machine direction threads is always lower than in machine-side cross-machine direction threads. It is the object of the invention to combine the advantages of these two variants with one another, ie on the one hand to provide a high abrasion volume of the screen and on the other hand to keep the load absorption of the screen as low as possible.
- a sieve in particular a forming fabric for a machine for producing a fibrous web, in particular a paper, board or packaging paper web, comprising a
- Machine contact page providing second fabric layer, wherein
- the first fabric layer and the second fabric layer are connected to one another by binding threads,
- the first fabric layer comprises first MD yarns and first CMD yarns interwoven therewith;
- the second fabric ply (Lu) comprises second machine direction yarns and second cross-machine direction yarns interwoven therewith, and interweaving the second machine direction yarns with the second machine direction yarns
- the screen of the present invention is characterized in that in each lower repeat, the relative length of the cross machine direction friction engagement surfaces to the relative length of the machine direction friction engagement surfaces is between 0.25 and 0.75, forming the relative length of the cross machine direction friction engagement surfaces is defined by the ratio of the sum of the lengths of the cross-machine direction rubbing surfaces to the machine direction length of the machine, and wherein the relative length of the machine direction rubbing surfaces is formed by the sum of the lengths of the machine direction rubbing surfaces to the length of the bottom Repeats in cross machine direction.
- the second fabric layer providing the machine contact side is configured in such a way that both the second cross-machine direction yarns and the second machine direction threads are available for the abrasion.
- the solution according to the invention has the advantage that the load absorption is reduced, since the dewatering elements in the paper machine do not run 100% against the longitudinal edge of the second cross-machine direction yarns, but partly also on the second machine direction yarns. At the same time, there is no danger of the screen breaking during operation in the paper machine, since both the second machine direction threads and cross-machine direction threads are available for the abrasion.
- the sieve according to the invention is in particular designed so that the above-mentioned properties are achieved at the latest after 1/3 of the limited by the abrasion time of the sieve.
- the respective length of a cross-machine direction friction engagement surface of a second machine cross-direction thread floating over at least two machine direction yarns on the machine contact side may be defined, for example, by the center-to-center distance between N + 1 machine direction threads. Further, the respective length of a machine direction frictional engagement surface of a second machine direction yarn floating on the machine contact side over M second cross machine direction yarns may be defined by the center to center distance between M + 1 cross machine direction yarns.
- a preferred embodiment of the invention provides that the ratio of relative length of the cross-machine direction extending Reibangriffs vom to the relative length of the running in the machine direction Reibangriffs vom is between 0.35 and 0.65. More preferably, the ratio of relative length of the cross-machine direction rubbing engagement surfaces to the relative length of the machine direction rubbing surfaces is between 0.45 and 0.55. As a result of this further balancing of the lengths of the friction engagement surfaces, the abrasion is distributed more uniformly among the second machine direction yarns and cross machine direction yarns, which can absolutely extend the running time of the fabric because the second machine direction yarns as well as the second machine direction yarns contribute substantially equal portions to the abrasion volume.
- At least some of the first and / or second machine direction yarns and / or at least some of the first and / or second cross-machine direction yarns substantially contain polyoxymethylene (POM), in particular these are POM.
- POM polyoxymethylene
- the use of POM as the material for at least some of the filaments of the screen has the advantage over standard materials that POM has a lower coefficient of friction with itself than does PET or PA.
- POM has a higher modulus of elasticity than PET and PA and less tendency to absorb water than PA and PET, which are standard materials for use in forming fabrics.
- the sieve is subject to constant abrasion.
- a preferred embodiment of the invention therefore provides for the case that more abraded volume is provided by the second machine direction yarns than by the second cross machine direction yarns that in the thickness direction of the sieve
- the distance z between the first and the second abrasion height a maximum of 90 ⁇ m, preferably a maximum of ⁇ m, more preferably a maximum of 30 ⁇ m is.
- An alternative embodiment of the invention therefore provides for the case that more abrasion volume is provided by the second machine barking yarns than by the second machine direction yarns that viewed in the thickness direction of the wire at a first abrasion height 20% of running on the machine contact side floats of the second Maschinenquernchtungsfaden the at a second level of abrasion contribute 50% or more of the machine contact side flotations of the second machine transverse direction yarns of the lower repeat together with at least 10% of the machine contact side floats of the second machine direction yarns of the lower repeat to the total friction surface of the machine Siebs contribute, wherein the distance between the first and the second Abriebs Adjust maximum 90 ⁇ , preferably maximum ⁇ , more preferably at most 30 ⁇ bet rägt.
- the machine contact side floating second transverse machine direction yarns / machine direction yarns of the lower repeat is understood to mean the proportion of the second cross machine direction yarns / machine direction yarn flotations relative to the total number of the second lower machine direction cross machine direction yarns / machine direction threads certain abrasion height are visible. It should be noted that floatation is already counted if it becomes visible only as a fine line or as several points lying on a line.
- the lower repeat has, for example, 15 floats of the second machine direction threads and 5 floats of the second machine direction threads are visible at a certain abrasion level, this means in this example that 33.3% of the machine direction side floats of the second machine direction threads of the lower one are at this wear height Repeats contribute to the entire friction surface of the screen.
- the percentage of floats at certain levels of abrasion can be determined by means of a device manufactured by Nanofocus from D-46047 Oberhausen (http://www.nanofocus.de) under the name Nanofocus "pScan" is distributed.
- the binding threads are arranged in pairs, wherein the binding threads of each pair are interwoven with each other exchangeably with the first and the second fabric layer.
- the weave pattern of the first fabric layer is formed by interweaving the first machine direction yarns, the first cross machine direction yarns and the binding yarns. It is also conceivable that the binding threads run either in the machine direction or in the cross machine direction.
- the weave pattern of the first fabric layer may further be a plain weave.
- a preferred embodiment of the invention provides that the binding yarns are substantially the same, in particular smaller by a maximum of 10% or larger diameter than the first machine and / or machine transverse direction threads.
- the binding threads connecting the first fabric layer to the second fabric layer are not rubbed during proper operation of the fabric, a further preferred embodiment of the invention provides that the binding threads have a smaller diameter, in particular a smaller by 40% smaller diameter than the second machine and / or CMD yarns.
- Figure 1 is a machine contact side providing side of the second
- FIG. 2 shows a photograph of the machine contact side of FIG. 1
- FIG. 3 shows a pScan image of the machine contact side of FIG. 1
- FIG. 1 shows a side of a second fabric layer Lu, which provides a machine contact side 100, of a forming fabric according to the invention in a schematic representation.
- the second fabric layer Lu shown in the present embodiment has a weave structure repeated in lower reps Ru, each lower repeat being formed by ten second machine direction yarns 1K-10K and ten second cross-machine direction yarns 1S-10S interwoven therewith.
- frictional surfaces RK extending in the machine direction MD and flotations of the second cross-machine direction yarns 1 running on the machine contact side 100 on the machine contact side 100 fl y the second machine direction yarns 1 K-10K S-10S formed in machine transverse direction CD friction engagement surfaces RS.
- the ratio of the relative length of the cross-machine direction rubbing engagement surfaces to the relative length of the machine direction friction surfaces is between 0.4 and 2.44.
- the ratio of relative length of the friction engagement surfaces extending in the cross machine direction to the relative length of the friction engagement surfaces 1 extending in the machine direction which will be explained in more detail below.
- the respective length of a transverse engagement surface RS extending in the cross-machine direction CD of a second cross-machine direction yarn floating on the machine contact side 100 over N machine direction threads is determined by the center-to-center spacing between the N + 1 machine direction threads.
- the friction engagement surface RS, 10 of the second cross machine direction yarn 10S extends from the middle between the two second machine direction yarns 10K and 1K over the second machine direction yarns 1K to 5K to the middle between the two second machine direction yarns 5K and 6K.
- the first frictional engagement surface RS, 8 'of the second cross-machine direction yarn 8S extends from the middle between the two second machine direction yarns 10K and 1K over the second machine direction yarns 1K to 3K to the middle between the two second machine direction yarns 3K and 4K.
- the respective length of a machine direction MD frictional engagement surface RK of a second machine direction yarn floating on the machine contact side 10 over M cross machine direction yarns is determined by the center to center distance between M + 1 cross machine direction yarns.
- the frictional engagement surface RK, 2 of the second machine direction yarn 2K extends from the middle between the two second cross machine direction yarns 1S and 2S over the second machine cross direction yarns 2S to 6S to the middle between the two second machine cross direction yarns 6S and 7S.
- the first frictional engagement surface RK, 4 of the second cross-machine direction yarn 4K extends from the middle between the two second machine direction yarns 3S and 4S via the second machine direction yarns 4S to 8S to the middle between the two second machine direction yarns 8S and 9S.
- the relative length of the running in the cross-machine direction Reibangriffs vom is further formed by the ratio of the sum of Lengths of all friction surfaces running in machine direction to the length of the lower repeat in the machine direction.
- second cross-machine direction yarn 3S the frictional engagement surfaces RS, 3 ' and RS, 3 " with a relative length of 20% and 30%, respectively, relative to the length of the lower repeat Ru in machine direction MD
- second cross-machine direction yarn 2S the friction-engaging surfaces RS, 2 ' and RS, 2 " with a relative length of 30% and 20%, respectively, relative to the length of the lower repeat Ru in machine direction MD
- second cross-machine direction yarn 3S the frictional engagement surfaces RS, 3 ' and RS, 3 " with a relative length of 20% and 30%, respectively, relative to the length of the lower repeat Ru in machine direction MD
- second cross-machine direction yarn 2S the friction-engaging surfaces RS, 2 ' and RS, 2 " with a relative length of 30% and 20%, respectively, relative to the length of the lower repeat Ru in machine direction MD
- the relative length of the cross-machine direction friction engagement surfaces is thus 500% of the length of the lower machine direction repeat.
- the relative length of the machine direction frictional engagement surfaces is further formed by the ratio of the sum of the lengths of all machine direction frictional engagement surfaces to the length of the lower repeat in the cross machine direction.
- the relative length of the machine direction friction surfaces is thus 500% based on the length of the lower repeat Ru in the cross-machine direction.
- FIG. 2 shows a photograph of the machine contact side 100 of the second fabric layer 100 of the inventive screen illustrated in FIG. One recognizes a lower repeat Ru of the lower fabric layer Lu, which is formed by the ten second machine direction yarns 1 S-10 K woven through ten second machine direction yarns 1 K-10 K and ten second cross-machine direction yarns 1 S-10 S interwoven therewith. Furthermore, in the photograph shown in FIG. 2, binding threads B can be seen through which the first and the second fabric layers are connected to one another.
- the second machine direction yarns 1 K-10K have a smaller yarn diameter than the second machine cross-direction yarns 1 S-10S but a larger yarn diameter than the binder yarns B.
- FIG. 3 shows a "scan" image of the machine contact side 100 of the second fabric layer Lu shown in FIG. 1 at an abrasion level at which nine out of ten transversal machine directional floats contribute to the entire frictional engagement surface of the screen the machine contact side 100 running floats of the second cross-machine direction yarns 1 S-10S of the lower repeat Ru to the entire Reibangriffs constitutional the screen at.
Landscapes
- Woven Fabrics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012002969 | 2012-02-16 | ||
PCT/EP2013/051014 WO2013120656A1 (de) | 2012-02-16 | 2013-01-21 | Sieb für eine maschine zur herstellung einer faserstoffbahn |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2815024A1 true EP2815024A1 (de) | 2014-12-24 |
Family
ID=47594757
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13700745.6A Withdrawn EP2815024A1 (de) | 2012-02-16 | 2013-01-21 | Sieb für eine maschine zur herstellung einer faserstoffbahn |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2815024A1 (de) |
WO (1) | WO2013120656A1 (de) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007020071A1 (de) * | 2007-04-28 | 2008-10-30 | Voith Patent Gmbh | Formiersieb |
DE102010039360A1 (de) * | 2010-08-16 | 2012-02-16 | Voith Patent Gmbh | Sieb für eine Maschine zur Herstellung einer Faserstoffbahn |
-
2013
- 2013-01-21 EP EP13700745.6A patent/EP2815024A1/de not_active Withdrawn
- 2013-01-21 WO PCT/EP2013/051014 patent/WO2013120656A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2013120656A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013120656A1 (de) | 2013-08-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0116945B1 (de) | Verbund-Gewebe als Bespannung für den Blattbildungsteil einer Papiermaschine | |
DE2735750C2 (de) | Flachgewebtes Papiermachergewebe | |
DE3224187C2 (de) | Verband-Gewebe als Bespannung für den Blattbildungsbereich einer Papiermaschine | |
EP2106477B1 (de) | Gewebeband für eine maschine zur herstellung von bahnmaterial, insbesondere papier oder karton | |
EP0114656A1 (de) | Verbund-Gewebe als Bespannung für den Blattbildungsteil einer Papiermaschine | |
WO1988002797A1 (en) | Double layer paper-making cloth with coarse backing and fine paper side | |
DE102013108399B3 (de) | Papiermaschinensieb, dessen laufseite querfäden mit unterschiedlicher flottierungslänge aufweist | |
EP2470716B1 (de) | Blattbildungssieb | |
DE69627234T2 (de) | Pressgewebe | |
EP1619294A2 (de) | Papiermaschinenbespannung | |
DE2263476B2 (de) | Gewebe für Papiermaschinensiebe | |
DE4229828C2 (de) | Papiermaschinensieb in Form eines Verbundgewebes | |
DE202014001502U1 (de) | Gewobenes Sieb mit flachen Kettfäden | |
WO2010049304A1 (de) | Formiersieb | |
EP1798336A1 (de) | Papiermaschinensieb | |
EP1977037B1 (de) | Papiermaschinensieb | |
EP2815024A1 (de) | Sieb für eine maschine zur herstellung einer faserstoffbahn | |
DE102005039447A1 (de) | Papiermaschinensieb | |
DE102016200230A1 (de) | Trockensieb | |
DE102007058369A1 (de) | Gewebeband für eine Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton | |
EP1412571A1 (de) | Gewebegurt für eine wellpappenbeklebemaschine | |
EP1798334A1 (de) | Papiermaschinensieb | |
DE60316598T2 (de) | Trockensieb | |
WO2012022664A2 (de) | Sieb für eine maschine zur herstellung einer faserstoffbahn | |
EP0131940A2 (de) | Mehrlagiges Entwässerungssieb, insbesondere für den Blattbildungsteil einer Papiermaschine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20140916 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: UYMUR, IPEK Inventor name: HACK-UEBERALL, PETRA Inventor name: HOEHSL, MATTHIAS |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HACK-UEBERALL, PETRA Inventor name: HOEHSL, MATTHIAS Inventor name: UYMUR, IPEK |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20160502 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20160913 |