WO2005056446A1 - Procede et dispositif permettant de guider une bande - Google Patents

Procede et dispositif permettant de guider une bande Download PDF

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Publication number
WO2005056446A1
WO2005056446A1 PCT/FI2004/050186 FI2004050186W WO2005056446A1 WO 2005056446 A1 WO2005056446 A1 WO 2005056446A1 FI 2004050186 W FI2004050186 W FI 2004050186W WO 2005056446 A1 WO2005056446 A1 WO 2005056446A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
loop
guiding roll
reeling
supporting member
Prior art date
Application number
PCT/FI2004/050186
Other languages
English (en)
Inventor
Ilkka Naatti
Teppo Kojo
Risto MÄKINEN
Vesa RIIHELÄ
Matti Kemppainen
Topi Tynkkynen
Marko Tiilikainen
Original Assignee
Metso Paper, Inc
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 Metso Paper, Inc filed Critical Metso Paper, Inc
Priority to DE112004002273T priority Critical patent/DE112004002273T5/de
Publication of WO2005056446A1 publication Critical patent/WO2005056446A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/14—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web
    • B65H18/22—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web by friction band

Definitions

  • the invention relates to a method for guiding a web, which is of the type presented in the preamble of the appended claim 1.
  • the invention also relates to a device which is of the type presented in the preamble of the appended claim 10.
  • a typically several meters wide paper web which has been produced and/or treated in earlier machine sections, is reeled around a reel spool to form a machine reel.
  • a reeling cylinder that is journalled rotatable is typically used for guiding the paper web on the machine reel, wherein the nip contact between the reeling cylinder and the machine reel is utilized to influence the quality of the reel produced thereby.
  • the reeling cylinder remains stationary and the reel spool around which the reel is accumulated in nip contact is moved during reeling up in a supporting structure, for example by supporting the ends of the reel spool on reeling rails.
  • the ends of the reel spool are affected by means of a suitable loading mechanism to adjust the nip contact between the machine reel that is being formed and the reeling cylinder.
  • a suitable loading mechanism to adjust the nip contact between the machine reel that is being formed and the reeling cylinder.
  • US patent 5,370,327 discloses a solution in which the reeling cylinder moves in the vertical direction, thus making it possible to maintain the angular position of the nip between the reeling cylinder and the machine reel constant when the reel moves on the reeling rails.
  • the low position of the reeling cylinder and the movement of the same in the vertical direction enable the transfer of the reel spools from a storage to a reeling station along a straight transfer path.
  • the solution contains two pairs of reeling carriages, of which the pair that has delivered the full machine reel can return past the other pair that is guiding the reel to be reeled, to retrieve a new empty reel spool.
  • the publication EP-860391 discloses a reeler, in which the web is guided on a reel via a belt or a wire, which is led via guiding rolls.
  • a long reeling nip having an even pressure is provided on the area of the lower half of the reel.
  • the pressure can be adjusted through the tension of the belt or the wire.
  • the belt or wire loop can be tilted in the vertical plane in such a manner that the first guiding roll in the travel direction of the web can be lifted against the new reel spool, which rests on reeling rails above the belt.
  • the reel grows it moves forward on the reeling rails in such a manner that it is constantly in contact with the downwards-tilted run of the wire or belt, which follows the guiding roll and via which the web comes on the reel.
  • the patent US-5531396 discloses a reeler, in which the wire loop is guided over the reeling cylinder in such a manner that it guides the web after the reeling cylinder on the reel that is being formed.
  • problems are caused by the process of bringing the web on the wire or belt loop.
  • the web is brought to the loop at a point where the wire or the belt curves on top of the first guiding roll.
  • the central angle of the curve along which the web travels under the guidance of the guiding roll before moving on the straight section of the loop leading to the reel, can be called a wrap angle.
  • the wrap angle is the angle of the sector wrapped by the web when it travels on the curved section of the wire or the belt.
  • the publication EP-860391 shows that the belt enters the loop under the guidance of the guiding roll preceding the same in such a manner that the wrap angle is over 90°.
  • problems are caused by the speed differences on the outer surface of the loop, caused by the curving of the loop at the location of the guiding roll.
  • a belt-like mate- rial of certain thickness it is possible to determine a so-called neutral axis that always travels at the same speed irrespective of the curvature of the travel path of the belt.
  • the outer surface located outermost in the direction of the radius of the guiding roll travels faster than the neutral axis, whereas within the straight section following thereafter, the speeds of the outer surface and the neutral axis are the same.
  • the tension of the web increases at the location of the guiding roll due to the higher surface speed, which can cause slackening or even bag formation in the straight section following the guiding roll. This causes problems in the control of reeling, because the increase in tension must be taken into account in the tension control.
  • the method according to the invention is primarily characterized in what will be presented in the characterizing part of the appended claim 1.
  • the wrap angle at the location of the first guiding roll inside the loop and at the same time the tension of the web is controlled by means of a movable web guiding roll, whose location deter- mines the inlet angle of the web to the loop and correspondingly the wrap angle in the wire or belt travelling around the guiding roll.
  • the web guiding roll is located immediately before the loop in such a manner that the web travels directly from its periphery to the loop.
  • the web guiding roll is located advantageously on the same side of the web than the outer surface of the loop conveying the web, wherein it is at the same time possible to prevent the access of air between the outer surface of the loop and the web.
  • Fig. 1 illustrates schematically the main principle of the method in the reeling up process in a side view of the reeler
  • Fig. 2 illustrates the behaviour of the web when it comes to the loop
  • Fig. 3 illustrates the method according to the invention in a side- view of the reeler
  • Fig. 4 shows in a top view one possible way of performing the reeling.
  • Fig. 1 illustrates a continuously operating reel-up, where a paper web W, which is normally several meters wide and comes from a preceding section of a paper machine or a finishing apparatus for paper, travels via a reeling nip N to a reel R.
  • the reeling nip is formed by means of a flexible supporting member 1 in the form of an endless loop, such as a belt or a wire.
  • the supporting member 1 is guided via two guiding rolls 2 and 3, at the location of each of which the run of the member 1 turns to the opposite direction.
  • the first guiding roll 2 can form a "hard nip" with the reel being started at the initial stage of the reeling in such a manner that the supporting member 1 is in contact with the reel at a point where the member travels supported by the guiding roll 2 over the surface of the roll.
  • the second guiding roll 3 or the first guiding roll 2 can be a driven roll, i.e. a traction roll, or separate drives can be arranged for both rolls.
  • the second roll is a traction roll, wherein the section of the loop of the supporting member 1 guiding the web and forming a nip with the reel is tighter.
  • the web travels guided by the supporting member 1 onto the machine reel R, which is formed around a reel spool 5 rotatable with its own center drive. It is possible for the reel spool 5 to move in the machine direction with respect to the loop of the supporting member 1 , and this is arranged in such a manner that the bearing housings at the ends of the reel spool that enable the rotation of the reel spool 2 are supported on suitable supporting structures.
  • the reel change takes place at production speed, i.e. the paper web 1 passed at high speed to the full reel is changed to travel onto a new reel spool brought to the change station, said reel spool being rotated with a center drive of its own at peripheral speed corresponding to this speed.
  • the machine reel R can be transferred in the machine direction in a transfer device 7, which supports the bearing housings at the ends of the reel spool and which is moved by means of actuators attached to the frame of the reeler.
  • the transfer device 7 is arranged to move on substantially horizontal reeling rails 6 extending in the machine direction, and it is formed of a carriage at each end of the reel spool, which supports the bearing housing at the end of the reel spool 5.
  • the diameter of the machine reel R grows, and the reel moves forward, it is in continuous contact with the supporting member 1 because the transfer path of the transfer device 7 and the web-carrying portion of the supporting member 1 together form an angle opening in the trans- fer direction.
  • the upper web-carrying portion of the loop of the supporting member 1 is directed diagonally downwards in its direction of movement, whereas the transfer path of the reel R (and the reel spool 5) is substantially horizontal.
  • the transfer device 7 is transferred forward along the reeling rails 6 in the travel direction of the web 1 in accordance with the growth of the diameter of the reel R so that the reel is, at its lower side, always in contact with the loop of the supporting member 1 in such a manner that the web moves over to the outer periphery of the reel R in the reeling nip N between the web-carrying portion of the loop and said outer periphery.
  • the reeling nip N moves continuously forward in accordance with the growth of the reel in the travel direction of the upper portion of the loop.
  • the full reel R is removed from the transfer device 7, and the transfer device is moved back to the initial end of the portion of the loop carrying the web, and the new reel spool 5 around which a new web has started to accumulate after the change is delivered thereto from the initial reeling station.
  • Fig. 2 illustrates the factors affecting the behaviour of the web at the loop of the supporting member 1.
  • a web guiding roll 8 Before the loop of the supporting member there is a web guiding roll 8 whose location determines the entry point of the web W to the loop, i.e. the web travels in a straight form to the curved section of the loop that is formed because of the web guiding roll 2. As seen from the side, the straight section of the web thus coincides with the tangent common to the periphery of the web guiding roll 2 and the arc of the loop.
  • Fig. 2 shows the web tension in the machine direction (MD) at different points as well as the factors affecting the same.
  • MD machine direction
  • the arrival of the web W to the loop is guided by a web guiding roll 8 from whose periphery the web travels directly on that section of the loop of the supporting member 1 that curves on top of the peripheral surface of the first guiding roll 2.
  • the term belt will be used for the supporting member 1. The phenomena that will be discussed hereafter, take place in all planar flexible supporting members passed around the guiding roll 2 and having a certain thickness.
  • Vo speed of the neutral axis of the belt (and the surface speed of the belt at the straight section) [m/s]
  • V T surface speed of the belt at the curved section (at the location of the roll) [m/s]
  • R r radius of the belt guiding roll [m]
  • s b thickness of the belt [m]
  • s n distance of the neutral axis of the belt from the inner surface of the belt [m]
  • ⁇ wrap angle (rad)
  • T 0 tension of the web at the straight section [N/m]
  • T T maximum tension of the web at the curved section of the belt [N/m]
  • Li web length from the preceding hold point to the belt [m].
  • the hold point is the preceding point of the web transfer in which there exists holding between the web and the member drawing the web.
  • hold points include dryer and drive groups and grooved rolls.
  • the web guiding roll 8 constitutes such a hold point.
  • ⁇ relative elongation
  • E modulus of elasticity of the web [N/m]
  • t effective duration (the time the web is against the curved section of the belt) [s]
  • ⁇ time constant (the time during which the web travels from the preceding hold point to the belt) [s].
  • the relative elongation ⁇ resulting from the speed differences is obtained simply by dividing the increase in speed Vi-Vo with the original speed v 0 .
  • time constant ⁇ is calculated from the preceding figure with the formula /v 0 .
  • the hold between the web and the belt is obtained in the following manner.
  • the arrow M illustrates the possibility of moving the web guiding roll 8 in relation to the loop of the supporting member in such a manner that the entry point of the web on top of the supporting member and correspondingly the wrap angle ⁇ change.
  • the guiding roll 8 is moved in relation to the first guiding roll 2 located inside the loop.
  • the web guiding roll 8 can be arranged in the frame of the reeler to be moved for example substantially in the vertical direction along a linear path.
  • Figure 3 shows another alternative. It illustrates the possibility of changing the position of the loop of the supporting member 1 in the vertical direction for example in such a manner that the first guiding roll
  • the turning point can be another guiding roll, for example according to the solution disclosed in the publication EP-860391.
  • the guiding roll 8 defining the wrap angle ⁇ is mechanically coupled to the loop of the supporting member in such a manner that it moves when the loop is moved, but its position remains constant with respect to the run of the loop of the supporting member, in other words the straight line between axes of the web guiding roll 8 and the first guiding roll 2 of the loop is always at the same angle with respect to the straight line between the first guiding roll 2 and the second guiding roll 3.
  • the wrap angle is illus- trated by means of the angle between the extension of the straight section of the loop of the supporting member 1 and the straight section of the web preceding the loop, which according to the laws of geometry corresponds to the wrap angle ⁇ in magnitude.
  • the web guiding roll 8 in such a manner that its position can be adjusted with respect to the loop of the supporting member 1 , although it is kinetically coupled to the loop of the supporting member in such a manner that it moves along with the movement of the loop.
  • the web guiding roll 8 can be arranged pivotable for example in the vertical plane on the frame of the loop, and the entire loop can be transferred by moving said frame. It is possible to arrange actuators between the swinging arms, supporting the web guiding roll, and the frame of the loop, by means of which actuators this pivotal movement can be attained.
  • the aim is to keep the wrap angle under 90°, more advanta- geously under 45°.
  • the aim is to change it in such a manner that its value remains below said maximum values ⁇ max .
  • the wrap angle is advantageously always larger than 0, also in such a case where the aim is to arrange it as small as possible to avoid fluttering problems of the web and allow the transfer of web from its free section to the supporting member 1 (the belt) to take place in a controlled manner.
  • wrap angle may be advantageous to keep the wrap angle under 20° and/or to change its magnitude while it is kept below this maximum value ⁇ max .
  • the wrap angle that can be adjusted or kept in a certain constant value is advantageous especially in methods in which the reel spool 5 is center-driven, and the tension of the web layers of the reel R thus produced is influenced by adjusting the web tension in the section of the web immediately preceding the loop and/or by adjusting the torque (winding force) of the center drive.
  • the adjustment of the wrap angle is especially significant in such a case where the reeling nip N' is located in the curved section of the supporting member 1 , i.e. the reel is located at the guiding roll 2, thus forming a so-called "hard" nip.
  • This situation that can occur during the initial reeling is illustrated by means of a broken line in Fig. 2.
  • the web travels in the curved section before the nip N' in a sector smaller than the wrap angle ⁇ of a normal situation.
  • tension of the loop of the supporting member 1 itself. However, this does not have any effect on the web tension, but it can be utilized to affect the radial force between the peripheral surface of the reel and the outer surface of the loop in the reeling nip N, i.e. the nip load. In the method according to the invention this feature is also advantageously used as one adjustable parameter.
  • the tension of the supporting member can be adjusted for example by means of a tension roll that is in contact with the loop.
  • Fig. 4 shows an advantageous way of further improving the reeling in the reeler type shown in the figure. This is a reeling process with a supporting member 1 narrower than the web width, such as a wire.
  • the supporting member 1 When the supporting member 1 is narrower than the web W to be reeled and the reel R, the aforementioned problems are eliminated.
  • the outer edges of the supporting member are located inside the end edges of the reel R, and they do not hinder the exit of air from the reel.
  • the supporting member is in contact with the web and the reel within its entire width, and uneven wearing does not occur. If different trim widths are used, the width of the supporting member 1 , such as a wire, is dimesioned so that it is narrower than the minimum web width.
  • Fig. 4 The solution of Fig. 4 is well suited to be used in connection with ten- sion control, because by affecting the wrap angle in all ways shown in Figs 1 to 3 it is at the same time possible to affect the tension difference between the portion of the web positioned against the supporting member 1 and the edges of the web remaining outside the supporting member 1 at the location of the web guiding roll 2.
  • the so- lution of Fig. 4 can also be applied in such reeler types according to Fig. 1 , in which there is no web tension control by means of a web guiding roll preceding the loop of the supporting member.
  • the planar flexible supporting member 1 which forms a closed loop by means of two or more rolls, is advantageously air permeable, for example a wire.
  • such supporting members that are air impermeable also fall within the scope of the invention, for example belts having a closed surface.
  • the supporting member is of the same structure in the lateral direction of the machine, i.e. it corresponds to the width of the web being reeled.
  • the idea that the loop is formed of several in parallel next to each other travelling loops also falls within the scope of the invention, while the general geometry from the side-view is exactly the same as in Figs.
  • the tension of the loops can, for example, be adjusted independently according to the principles known from the publication EP-860391.
  • the tension behaviour of the web at the location of the guiding roll 2 is also in this case influenced by the same factors as in Fig. 2.
  • the wrap angle can also be changed in other ways besides changing its magnitude. For example, when the supporting member is pressed down under the effect of the reel R, it is possible to compensate the increase in the magnitude of the wrap angle, caused by this pressing, at the location of the first guiding roll 2 by moving the web guiding roll 8. Thus, the magnitude of the wrap angle can be kept the same, but the sector in which it is located is shifted with respect to the roll 2.
  • the movements of the loop in Fig. 3 can also be of other type, for example both guiding rolls 2 and 3 can also be transferred simultaneously.
  • the web guiding roll 8 can be transferred in the travel direction of the web in such a manner that the length of the straight web section between said web guiding roll and the guiding roll 2 can be transferred.

Abstract

L'invention concerne un procédé de bobinage de bande de papier enroulé de manière continue sur des enrouleuses autour d'un noyau d'enroulement rotatif. La bande (W) est guidée vers une enrouleuse (R) autour du noyau d'enroulement (5) par l'intermédiaire d'une ligne de contact d'enroulement située entre une boucle d'élément de support (1) sans fin et l'enrouleuse. Dans un étage quelconque, au moins le noyau d'enrouleuse (5) est transféré avec la boucle de l'élément de support (1) en fonction de l'augmentation du diamètre de l'enrouleuse (R) de sorte que la position de la ligne de contact (N) d'enroulement se déplace vers l'avant, sur la partie portant la bande de l'élément de support (1) sans fin dans le sens de déplacement de cette partie. L'angle d'enroulement (α) de la bande (W) au niveau d'un premier cylindre de guidage (2) de la boucle d'élément de support (1) sans fin ainsi que la tension de la bande au niveau de ce premier cylindre de guidage (2) sont commandés au moyen d'un cylindre de guidage (8) de bande précédant la boucle dans le sens de déplacement de ladite bande.
PCT/FI2004/050186 2003-12-15 2004-12-15 Procede et dispositif permettant de guider une bande WO2005056446A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112004002273T DE112004002273T5 (de) 2003-12-15 2004-12-15 Verfahren und Vorrichtung zum Führen einer Bahn

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20031834 2003-12-15
FI20031834A FI118259B (fi) 2003-12-15 2003-12-15 Menetelmä ja laite rainan ohjaamiseksi

Publications (1)

Publication Number Publication Date
WO2005056446A1 true WO2005056446A1 (fr) 2005-06-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2004/050186 WO2005056446A1 (fr) 2003-12-15 2004-12-15 Procede et dispositif permettant de guider une bande

Country Status (3)

Country Link
DE (1) DE112004002273T5 (fr)
FI (1) FI118259B (fr)
WO (1) WO2005056446A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007026326A1 (fr) * 2005-08-31 2007-03-08 The Procter & Gamble Company Processus d'enroulement de materiau en bande
EP1741648A3 (fr) * 2005-07-08 2008-08-27 Metso Paper, Inc. Méthode d'enroulement à courroie et enrouleuse à courroie

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143828A (en) * 1977-04-26 1979-03-13 Escher Wyss Gmbh Winder for a papermaking machine
US4283023A (en) * 1978-03-22 1981-08-11 Escher Wyss Gmbh Winder apparatus for a paper machine
US5531396A (en) * 1993-12-16 1996-07-02 Valmet Corporation Method and device for reeling a paper or board web in a drum reel-up or equivalent
EP0860391A1 (fr) * 1997-02-13 1998-08-26 Valmet Corporation Dispositif d'enroulement et procédé pour enrouler des bandes de papier ou similaire
US5944273A (en) * 1997-07-03 1999-08-31 Kimberly-Clark Worldwide, Inc. Parent roll for tissue paper
US6382550B1 (en) * 1997-12-22 2002-05-07 Valmet Corporation Pressure roller reel-up

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143828A (en) * 1977-04-26 1979-03-13 Escher Wyss Gmbh Winder for a papermaking machine
US4283023A (en) * 1978-03-22 1981-08-11 Escher Wyss Gmbh Winder apparatus for a paper machine
US5531396A (en) * 1993-12-16 1996-07-02 Valmet Corporation Method and device for reeling a paper or board web in a drum reel-up or equivalent
EP0860391A1 (fr) * 1997-02-13 1998-08-26 Valmet Corporation Dispositif d'enroulement et procédé pour enrouler des bandes de papier ou similaire
US5944273A (en) * 1997-07-03 1999-08-31 Kimberly-Clark Worldwide, Inc. Parent roll for tissue paper
US6382550B1 (en) * 1997-12-22 2002-05-07 Valmet Corporation Pressure roller reel-up

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741648A3 (fr) * 2005-07-08 2008-08-27 Metso Paper, Inc. Méthode d'enroulement à courroie et enrouleuse à courroie
WO2007026326A1 (fr) * 2005-08-31 2007-03-08 The Procter & Gamble Company Processus d'enroulement de materiau en bande
US7455260B2 (en) 2005-08-31 2008-11-25 The Procter & Gamble Company Process for winding a web material

Also Published As

Publication number Publication date
FI20031834A0 (fi) 2003-12-15
DE112004002273T5 (de) 2006-11-02
FI118259B (fi) 2007-09-14
FI20031834A (fi) 2005-06-16

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