EP0774540A2 - Procédé pour régler la longueur de rupture dans le sens transversal d'une bande fibreuse en mouvement - Google Patents

Procédé pour régler la longueur de rupture dans le sens transversal d'une bande fibreuse en mouvement Download PDF

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Publication number
EP0774540A2
EP0774540A2 EP96118249A EP96118249A EP0774540A2 EP 0774540 A2 EP0774540 A2 EP 0774540A2 EP 96118249 A EP96118249 A EP 96118249A EP 96118249 A EP96118249 A EP 96118249A EP 0774540 A2 EP0774540 A2 EP 0774540A2
Authority
EP
European Patent Office
Prior art keywords
web
fiber layer
fiber orientation
paper web
headbox
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
Application number
EP96118249A
Other languages
German (de)
English (en)
Other versions
EP0774540B1 (fr
EP0774540A3 (fr
Inventor
Ulrich Begemann
Adolf Guggemos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0774540A2 publication Critical patent/EP0774540A2/fr
Publication of EP0774540A3 publication Critical patent/EP0774540A3/fr
Application granted granted Critical
Publication of EP0774540B1 publication Critical patent/EP0774540B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 of a running fibrous web in a paper machine by means of a stock density-controlled headbox, which spreads the stock suspension on or between two screens.
  • the paper stock suspension is fed to the flow chamber of the headbox by means of a plurality of channels which are distributed parallel and evenly distributed over the machine width.
  • Each channel is preceded by a mixer with which the concentration and the throughput in the channel can be variably adjusted. Thanks to this principle, there is no need for adjusting spindles on the lips of the outlet channel of the headbox.
  • the lips are kept straight by a more or less rigid construction, so that the outlet gap seen across the width between the lips has a constant width. In other constructions - such as B. in US 5196 091 - the outlet gap is also adjusted.
  • the tear length is a measure of the tear strength of the paper. This measure indicates how long a strip of paper can be until it tears 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 to design the paper manufacturing process in such a way that the cross-sections can be influenced by the tear length ratio and basis weight, so that they run primarily in a straight line, that the above-mentioned bath effect is largely suppressed, and thus 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 correlates directly with the fiber orientation ( fiber orientation) in the paper web, but is not solely responsible for it.
  • This fiber orientation can be measured off-line and on-line.
  • the off-line method is described below.
  • Various samples are taken from a finished paper roll at the end of the paper machine across the width of the web. These samples are used to mark the web running direction, the machine's long sides (driver and drive side) and the dimension X, i.e. the distance of the sample from above looking at the paper viewed from the left edge.
  • 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.
  • a fictitious coordinate system is placed on the paper sample to assess the fiber orientation.
  • the Y axis points in the direction of web travel and the X axis accordingly transversely to it.
  • the tear length is now determined, for example, as a function of the measurement angle (positive angle from positive Y axis in the direction of positive X axis and negative angle from positive Y axis in the direction of negative X axis).
  • the presentation of the results in the form of vectors, the starting points of which are at the origin of the fictitious coordinate system results in a semi-ellipse, the main axes of which may not coincide with the coordinate axes.
  • the orientation of the main axes was determined in the direction of web travel or clockwise at right angles 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 indicates the fiber orientation angle.
  • anisotropy This property of the direction-dependent strength value of the paper is called anisotropy. For example, it is expressed quantitatively with the tear length ratio.
  • the inventors have recognized that, despite the large number of parameters to be observed and in some cases mutually dependent, the setting of a substantially flat basis weight profile and a tear length ratio cross profile is possible at the same time.
  • Such a headbox also has a sectionally adjustable orifice, there is another control element.
  • the effect of the basis weight increase at the web edges can thus be compensated for.
  • further measures to influence the consistency and / or volume flow are then necessary to ensure good fiber orientation.
  • a uniform fiber orientation cross profile does not mean that the tear length ratio cross profile is also good at the same time.
  • the inventors take into account the change in the transverse tear length due to the transverse shrinkage, in particular the change in the transverse tear length in the area of the web edge.
  • the fiber layer across the web width is deliberately set differently in the edge area than in the middle area.
  • the tools for this are the influencing of the fiber layer by sectionally different turbulence states, orifice openings, volume flows, material densities, differential speeds between screen and material 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 have been chosen by way of example so that their fiber orientation angle is zero. In practice, however, they can deviate slightly from this value in relation to the edge area of a web.
  • the main axis 6 of the fiber orientation ellipses which points more or less in the Y direction, has the same length for illustrative reasons.
  • FIGS. 2a to 2c the main axis 6 and the main axes 7, 8, 9 coincide with the axes of the coordinate system.
  • the main axes 6, 7, 8 and 9 thus simultaneously embody the tear lengths of these samples.
  • the tear length ratio is approximately one in FIGS. 2a and 2b.
  • a positive value greater than one results for FIG. 2b.
  • the fiber orientation angle is zero in each of FIGS. 2a to c.
  • FIGS. 3a and 3c the main axes 6, 12 and 13 do not coincide with the tear lengths 14, 15 and 16, 17 because of the fiber orientation angle 10 and 11, respectively.
  • the fiber orientation angle is zero and therefore the main axes coincide with the tear lengths.
  • Figures 3a to c represent graphs 3 and 1 in Figure 1.
  • Figures 4a to c correspond to Figures 2a to c after the paper web has dried.
  • the auxiliary lines 18, 19, 21 and 22 the width of the web has shrunk.
  • the auxiliary lines 18 and 22 show a greater shrinkage in the outermost edge region than the auxiliary lines 19 and 21 in the region located further towards the center of the web.
  • the transverse tear length has now been set such that the same tear length ratio arises for the fiber orientation ellipses in the edge region as for the middle web region.
  • the main axis 7 became a vector 23.
  • the vector 23 essentially corresponds to the vector 8, since the shrinkage due to drying has only an insignificant effect in the middle of the web.
  • FIGS. 5a to c correspond to FIGS. 3a to c after the paper web has dried. The same applies here to FIGS. 2a to c and FIGS. 4a to c.
  • the tear length 24 of Figures 5b corresponds to that of Figures 5a and c.

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  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP96118249A 1995-11-17 1996-11-14 Procédé pour régler la longueur de rupture dans le sens transversal d'une bande fibreuse en mouvement Expired - Lifetime EP0774540B1 (fr)

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 true EP0774540A2 (fr) 1997-05-21
EP0774540A3 EP0774540A3 (fr) 1998-01-07
EP0774540B1 EP0774540B1 (fr) 2002-02-27

Family

ID=7777706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96118249A Expired - Lifetime EP0774540B1 (fr) 1995-11-17 1996-11-14 Procédé pour régler la longueur de rupture dans le sens transversal d'une bande fibreuse en mouvement

Country Status (3)

Country Link
US (1) US6179963B1 (fr)
EP (1) EP0774540B1 (fr)
DE (1) DE59608786D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713272U1 (de) * 1997-07-25 1997-11-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Stoffauflauf zur Bildung einer Faserstoffsuspensionsschicht
EP1033437A2 (fr) * 1999-03-02 2000-09-06 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif de régulation de proportion de longeur de rupture dans une machine à papier
US6179963B1 (en) 1995-11-17 2001-01-30 Voith Sulzer Papiermaschinen Gmbh Process for influencing the breaking length cross-machine profile of a running fibrous material web
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

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7988706B2 (en) * 2005-04-11 2011-08-02 St. Jude Medical Puerto Rico Llc Tissue puncture closure device with automatic torque sensing tamping system
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
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
US8298259B2 (en) * 2009-05-05 2012-10-30 St. Jude Medical Puerto Rico Llc Tissue puncture closure device with actuatable automatic spool driven compaction system
EP2464296B1 (fr) 2009-08-14 2018-09-19 Terumo Puerto Rico L.L.C. Tube de support pour dispositif de fermeture vasculaire
US9820727B2 (en) 2009-08-24 2017-11-21 St. Jude Medical Puerto Rico Llc Single piece, dual component sealing pad and methods
US9603588B2 (en) 2009-08-31 2017-03-28 St. Jude Medical Puerto Rico Llc Compressible arteriotomy locator for vascular closure devices and methods
WO2011025543A2 (fr) 2009-08-31 2011-03-03 St. Jude Medical Puerto Rico Llc Système monorail pour dispositif de fermeture vasculaire et procédés associés
WO2011037635A1 (fr) 2009-09-25 2011-03-31 St. Jude Medical Puerto Rico Llc Accès vasculaire pour gaine de fermeture et procédés
AU2011253475B2 (en) 2010-05-12 2014-08-14 St. Jude Medical, Inc. Bioadhesive applicator and methods of sealing tissue punctures using same
JP6300524B2 (ja) 2010-07-12 2018-03-28 テルモ プエルトリコ エルエルシー 圧密化不要とした組織穿刺部閉鎖装置
US9220489B2 (en) 2010-08-20 2015-12-29 St. Jude Medical Puerto Rico Llc Clutch release mechanism for vascular closure device
WO2012030376A1 (fr) 2010-08-30 2012-03-08 St. Jude Medical Puerto Rico Llc Système de came désengageable pour dispositif de fermeture de ponction de tissu
US9149264B2 (en) 2010-10-08 2015-10-06 St. Jude Medical Puerto Rico Llc Cam driven compaction tube for vascular closure device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514554A1 (de) 1984-09-19 1986-03-27 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf-vorrichtung fuer eine papiermaschine und verfahren zu deren betrieb
US5196091A (en) 1991-10-29 1993-03-23 Beloit Technologies, Inc. Headbox apparatus with stock dilution conduits for basis weight control
DE4019593C2 (de) 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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US3837999A (en) * 1971-12-20 1974-09-24 Kimberly Clark Co Method of controlling the orientation of fibers in a foam formed sheet
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.
US5383778A (en) * 1990-09-04 1995-01-24 James River Corporation Of Virginia Strength control embossing apparatus
FI100894B (fi) * 1993-07-01 1998-03-13 Valmet Paper Machinery Inc Menetelmä ja laite perälaatikon säädössä
EP0774540B1 (fr) 1995-11-17 2002-02-27 Voith Paper Patent GmbH Procédé pour régler la longueur de rupture dans le sens transversal d'une bande fibreuse en mouvement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514554A1 (de) 1984-09-19 1986-03-27 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf-vorrichtung fuer eine papiermaschine und verfahren zu deren betrieb
DE4019593C2 (de) 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen
US5196091A (en) 1991-10-29 1993-03-23 Beloit Technologies, Inc. Headbox apparatus with stock dilution conduits for basis weight control

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6179963B1 (en) 1995-11-17 2001-01-30 Voith Sulzer Papiermaschinen Gmbh Process for influencing the breaking length cross-machine profile of a running fibrous material web
DE29713272U1 (de) * 1997-07-25 1997-11-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Stoffauflauf zur Bildung einer Faserstoffsuspensionsschicht
EP1033437A2 (fr) * 1999-03-02 2000-09-06 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif de régulation de proportion de longeur de rupture dans une machine à papier
DE19908973A1 (de) * 1999-03-02 2000-09-07 Voith Sulzer Papiertech Patent Verfahren zur Regelung des Reißlängenverhältnisses einer erzeugten Papierbahn und Papiermaschine
EP1033437A3 (fr) * 1999-03-02 2001-03-21 Voith Paper Patent GmbH Procédé et dispositif de régulation de proportion de longeur de rupture dans une machine à papier
US6251225B1 (en) 1999-03-02 2001-06-26 Voith Sulzer Papiertechnik Patent Gmbh Process for regulating the breaking length ratio of a manufactured paper web
US6536443B1 (en) 1999-03-02 2003-03-25 Voith Sulzer Papiertechnik Patent Gmbh Apparatus for regulating the breaking length ratio of a manufactured paper web
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

Also Published As

Publication number Publication date
DE59608786D1 (de) 2002-04-04
US6179963B1 (en) 2001-01-30
EP0774540B1 (fr) 2002-02-27
EP0774540A3 (fr) 1998-01-07

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