EP0774540B1 - Verfahren zur Beeinflussung des Reisslängen-Querprofiles einer laufenden Faserstoffbahn - Google Patents
Verfahren zur Beeinflussung des Reisslängen-Querprofiles einer laufenden Faserstoffbahn Download PDFInfo
- Publication number
- EP0774540B1 EP0774540B1 EP96118249A EP96118249A EP0774540B1 EP 0774540 B1 EP0774540 B1 EP 0774540B1 EP 96118249 A EP96118249 A EP 96118249A EP 96118249 A EP96118249 A EP 96118249A EP 0774540 B1 EP0774540 B1 EP 0774540B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- fiber orientation
- fibre orientation
- cross
- paper web
- 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.)
- Expired - Lifetime
Links
Images
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
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/09—Uses for paper making sludge
- Y10S162/10—Computer control of paper making variables
- Y10S162/11—Wet end paper making variables
Definitions
- the invention relates to a method according to the preamble of Claim 1 for influencing the tear length cross profile one running fibrous web in a paper machine of a stock density-controlled headbox that contains the stock suspension spreads on one or between two sieves.
- the essential quality features of paper webs are Uniformity of paper thickness, the strengths in longitudinal and cross direction, fiber orientation and basis weight, seen across the web width.
- the basis weight profile is of crucial importance.
- the tear length is a measure of the tensile strength of the Paper. This measure indicates how long a paper strip can be until it tears off under the weight of its own weight.
- the tear length can be determined in the longitudinal direction of the paper web, but also in the transverse direction.
- a particular problem is the so-called rip length ratio.
- a web with a large ratio of R L / R Q can absorb strong longitudinal tensile forces. This is of particular interest when processing in high-speed printing presses. There, R L should be large in relation to R Q.
- the invention has for its object the paper manufacturing process to design such that the cross profiles of Tear length ratio and basis weight can be influenced, so that they run straight, above all, that the above Bathtub effect is largely suppressed, and that the profile of the tear length ratio - across the web width considered - becomes as straight as possible.
- the inventors knew that the tear length ratio with the fiber orientation ( fiber orientation) in the paper web correlates directly, but is not solely responsible for it.
- This fiber orientation can be measured off-line and on-line. in the the off-line method is described below. you takes from a finished paper wrap at the end of the Paper machine across the width of the web different samples. The direction of web travel, the Machine longitudinal sides - (driver and drive side) and the dimension X, i.e. the distance of the sample from the top of the paper looking from the left margin.
- This off-line measurement method gives a good overview of the Fiber orientation of the paper web currently being produced, since the Production processes are sufficiently stationary over time.
- the paper sample is used to assess the fiber orientation a fictitious coordinate system.
- the Y axis points in the direction of web travel and the X-axis accordingly across. Regardless of the measurement method used, is now dependent from the measuring angle (positive angle from positive Y axis in the direction of the positive X axis and negative angle of positive Y-axis measured in the direction of the negative X-axis) for example, the tear length determined.
- the representation of the Results in the form of vectors, the starting points of which are in Origin of the fictitious coordinate system results a semi-ellipse, the main axes of which may not match the Coordinate axes coincide.
- the orientation of the main axes was in the direction of web travel or clockwise in set right angle to it.
- the ratio of the location vector in the Y direction to the location vector in the positive X direction then results in the so-called tear length ratio.
- the value is dimensionless.
- the angle between the maximum location vector and the positive Y axis gives that Fiber orientation angle.
- anisotropy This property of the directional strength value the paper is called anisotropy. For example, it becomes quantitative expressed with the tear length ratio.
- Paper fibers shrink across them when they dry Longitudinal extension stronger than in its longitudinal direction, nevertheless is the stronger cross shrinkage effect at the edges of one Paper web not alone with one typical for the edge area Explain fiber orientation.
- the inventors were also aware of any measures for influencing the fiber orientation and thus influencing the length ratio at no time that Basis weight cross-section may deteriorate.
- the object of the invention is achieved by the characterizing part of claim 1 solved.
- the inventors have recognized that despite the variety of those to be considered and partly mutually dependent parameters at the same time hiring one essentially flat basis weight and a tear length ratio cross profile is possible.
- the invention of the density-controlled headboxes can be a good basis weight and a set good fiber orientation cross profile.
- Such a headbox also has one sectionally adjustable aperture, so you have another Control element.
- the effect of increasing the basis weight at the edges of the web can be compensated for.
- further measures of consistency and / or influencing the volume flow required to to ensure good fiber orientation can be compensated for.
- the inventors by changing the transverse tear length transverse shrinkage, especially the change in transverse tear length in the web edge area.
- the fiber layer across the web width is deliberately set differently in the marginal area than in the middle area.
- the tools for this are influencing the fiber layer due to sectionally different turbulence states, aperture openings, Volume flows, material densities, differential speeds between screen and fabric jet and wall roughness.
- curve 1 shows a sketch of the tear length ratio - cross profile R L / R Q of a web before the measures according to the invention are applied.
- a and B indicate the respective web edges.
- the so-called "bath tub profile” is clearly recognizable.
- Graph 2 ideally shows the tear length ratio cross profile after the measures according to the invention have been applied.
- Graph 3 shows the fiber orientation angle alpha over the width of a web, as can be seen in FIGS. 3a to c as representatives of a specific fiber orientation cross profile.
- Figures 2b to 5b were chosen as an example so that you Fiber orientation angle is zero. In practice, they can but slightly in relation to the edge area of a web deviate from this value.
- Figures 3a and 3c fall because of the fiber orientation angle 10 and 11 the main axes 6, 12 and 13 not with the Tear lengths 14, 15 and 16, 17 together.
- Figure 3b the fiber orientation angle is zero and therefore the Main axes together with the tear lengths.
- Figures 3a to c represent graphs 3 and 1 in FIG. 1.
- Figures 4a to c correspond to Figures 2a to c according to the Drying the paper web. How to use guides 18, 19, 21 and 22 can read, the width of the web is there shrunk.
- the auxiliary lines 18 and 22 show one greater shrinkage in the outermost edge area than that Auxiliary lines 19 and 21 located further towards the center of the train Area.
- Figures 5a to c correspond to Figures 3a to c according to the Drying the paper web. The same applies here to the Figures 2a to c and Figures 4a to c.
- the tearing length 24 of the Figures 5b corresponds to those of Figures 5a and c.
Description
Claims (9)
- Verfahren zum Herstellen einer Papierbahn mit einem im wesentlichen homogenen Flächengewichtsquerprofil und einem weiteren im wesentlichen homogenen Bahneigenschaftsquerprofil
dadurch gekennzeichnet, daß das Bahneigenschaftsquerprofil über die Faserlage derart eingestellt wird, daß das Verhältnis der Reißlänge in Längsrichtung zu der Reißlänge in Querrichtung über die Bahnbreite im wesentlichen konstant ist. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Reißlänge in Längsrichtung und die Reißlänge über die Papierbahnbreite im wesentlichen konstant sind.
- Verfahren nach mindestens einen der Ansprüche 1 und 2,
dadurch gekennzeichnet, daß die Papierbahn noch naß ist. - Verfahren nach mindestens einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Papierbahn ihren Endtrockenwert erreicht hat. - Verfahren nach mindestens einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß die Faserlage durch die sektionale unterschiedliche Blendeneinstellung des Stoffauflaufes eingestellt wird. - Verfahren nach mindestens einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß die Faserlage durch die sektionale unterschiedliche Rauhigkeit der strömungsführenden Wände des Stoffauflaufes eingestellt wird. - Verfahren nach mindestens einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß die Faserlage durch sektionale unterschiedliche Volumentströme im Stoffauflauf eingestellt wird. - Verfahren nach mindestens einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, daß die Faserlage durch sektional unterschiedliche Stoffdichten im Stoffauflauf eingestellt wird. - Verfahren nach mindestens einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß die Faserlage durch sektional unterschiedliche Differenzgeschwindigkeiten zwischen Siebgeschwindigkeit und Stoffstrom eingestellt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19542873 | 1995-11-17 | ||
DE19542873 | 1995-11-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0774540A2 EP0774540A2 (de) | 1997-05-21 |
EP0774540A3 EP0774540A3 (de) | 1998-01-07 |
EP0774540B1 true EP0774540B1 (de) | 2002-02-27 |
Family
ID=7777706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96118249A Expired - Lifetime EP0774540B1 (de) | 1995-11-17 | 1996-11-14 | Verfahren zur Beeinflussung des Reisslängen-Querprofiles einer laufenden Faserstoffbahn |
Country Status (3)
Country | Link |
---|---|
US (1) | US6179963B1 (de) |
EP (1) | EP0774540B1 (de) |
DE (1) | DE59608786D1 (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59608786D1 (de) | 1995-11-17 | 2002-04-04 | Voith Paper Patent Gmbh | Verfahren zur Beeinflussung des Reisslängen-Querprofiles einer laufenden Faserstoffbahn |
DE29713272U1 (de) * | 1997-07-25 | 1997-11-20 | Voith Sulzer Papiermasch Gmbh | Stoffauflauf zur Bildung einer Faserstoffsuspensionsschicht |
DE19908973A1 (de) * | 1999-03-02 | 2000-09-07 | Voith Sulzer Papiertech Patent | Verfahren zur Regelung des Reißlängenverhältnisses einer erzeugten Papierbahn und Papiermaschine |
DE10351295A1 (de) * | 2003-10-31 | 2005-06-02 | Voith Paper Patent Gmbh | Verfahren zum Erzeugen einer Faserstoffbahn und Vorrichtung zur Durchfühung des Verfahrens |
DE10355687A1 (de) * | 2003-11-28 | 2005-06-23 | Voith Paper Patent Gmbh | Verfahren zur Herstellung einer Faserstoffbahn |
US7713283B2 (en) | 2005-04-11 | 2010-05-11 | St. Jude Medical Puerto Rico, Llc | Tissue puncture closure device with magazine fed tamping system |
US7250057B2 (en) * | 2005-04-11 | 2007-07-31 | St. Jude Medical Puerto Rico B.V. | Tissue puncture closure device with automatic torque sensing tamping system |
US7988706B2 (en) | 2005-04-11 | 2011-08-02 | St. Jude Medical Puerto Rico Llc | Tissue puncture closure device with automatic torque sensing tamping system |
US7837705B2 (en) | 2005-05-17 | 2010-11-23 | St. Jude Medical Puerto Rico Llc | Tissue puncture closure system with retractable sheath |
US7618438B2 (en) | 2005-05-17 | 2009-11-17 | St. Jude Medical Puerto Rico Llc | Tissue puncture closure device with disengagable automatic tamping system |
US7850710B2 (en) | 2006-05-23 | 2010-12-14 | St. Jude Medical Puerto Rico Llc | Puncture closure apparatuses, sealing plugs, and related methods |
WO2010129042A1 (en) | 2009-05-05 | 2010-11-11 | St. Jude Medical Puerto Rico Llc | Tissue puncture closure device with actuatable automatic spool driven compaction system |
WO2011019374A1 (en) | 2009-08-14 | 2011-02-17 | St. Jude Medical Puerto Rico Llc | Carrier tube for vascular closure device and methods |
WO2011025529A1 (en) | 2009-08-24 | 2011-03-03 | St. Jude Medical Puerto Rico Llc | Single piece, dual component sealing pad and methods |
WO2011025528A1 (en) | 2009-08-31 | 2011-03-03 | St. Jude Medical Puerto Rico Llc | Compressible arteriotomy locator for vascular closure devices and methods |
WO2011025543A2 (en) | 2009-08-31 | 2011-03-03 | St. Jude Medical Puerto Rico Llc | Monorail system for vascular closure device and methods |
US9282994B2 (en) | 2009-09-25 | 2016-03-15 | St. Jude Medical Puerto Rico Llc | Vascular access to closure sheath and methods |
WO2011142821A1 (en) | 2010-05-12 | 2011-11-17 | St. Jude Medical, Inc. | Bioadhesive applicator and methods of sealing tissue punctures using same |
AU2011279728B2 (en) | 2010-07-12 | 2015-06-25 | St. Jude Medical Puerto Rico Llc | Compactionless tissue puncture closure device and methods |
US9220489B2 (en) | 2010-08-20 | 2015-12-29 | St. Jude Medical Puerto Rico Llc | Clutch release mechanism for vascular closure device |
JP5951609B2 (ja) | 2010-08-30 | 2016-07-13 | セイント ジュード メディカル プエルト リコ エルエルシー | 組織穿刺部閉鎖装置用解放可能カムシステム |
US9149264B2 (en) | 2010-10-08 | 2015-10-06 | St. Jude Medical Puerto Rico Llc | Cam driven compaction tube for vascular closure device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3837999A (en) * | 1971-12-20 | 1974-09-24 | Kimberly Clark Co | Method of controlling the orientation of fibers in a foam formed sheet |
DE3514554C3 (de) | 1984-09-19 | 1998-01-08 | Escher Wyss Gmbh | Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb |
US4687548A (en) | 1984-10-31 | 1987-08-18 | Valmet Oy | Method and apparatus for controlling distortion of fibre orientation in a paper web |
AT392989B (de) | 1988-05-17 | 1991-07-25 | Voith Ag J M | Stoffauflauf fuer papiermaschinen |
FI79363C (fi) | 1988-09-26 | 1989-12-11 | Valmet Paper Machinery Inc | Foerfarande och anordning i inloppslaodan av en pappersmaskin foer att behaerska foerdelningen i pappersbanans fiberorientering. |
DE4019593C2 (de) | 1990-06-20 | 1994-01-20 | Voith Gmbh J M | Stoffauflauf für Papiermaschinen |
US5383778A (en) * | 1990-09-04 | 1995-01-24 | James River Corporation Of Virginia | Strength control embossing apparatus |
US5196091A (en) | 1991-10-29 | 1993-03-23 | Beloit Technologies, Inc. | Headbox apparatus with stock dilution conduits for basis weight control |
FI100894B (fi) * | 1993-07-01 | 1998-03-13 | Valmet Paper Machinery Inc | Menetelmä ja laite perälaatikon säädössä |
DE59608786D1 (de) | 1995-11-17 | 2002-04-04 | Voith Paper Patent Gmbh | Verfahren zur Beeinflussung des Reisslängen-Querprofiles einer laufenden Faserstoffbahn |
-
1996
- 1996-11-14 DE DE59608786T patent/DE59608786D1/de not_active Expired - Fee Related
- 1996-11-14 EP EP96118249A patent/EP0774540B1/de not_active Expired - Lifetime
- 1996-11-18 US US08/746,918 patent/US6179963B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE59608786D1 (de) | 2002-04-04 |
EP0774540A3 (de) | 1998-01-07 |
US6179963B1 (en) | 2001-01-30 |
EP0774540A2 (de) | 1997-05-21 |
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