EP1264044B1 - Procede et dispositif de convoyage d'une pointe de bande de papier - Google Patents

Procede et dispositif de convoyage d'une pointe de bande de papier Download PDF

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Publication number
EP1264044B1
EP1264044B1 EP01913919A EP01913919A EP1264044B1 EP 1264044 B1 EP1264044 B1 EP 1264044B1 EP 01913919 A EP01913919 A EP 01913919A EP 01913919 A EP01913919 A EP 01913919A EP 1264044 B1 EP1264044 B1 EP 1264044B1
Authority
EP
European Patent Office
Prior art keywords
tail
belt conveyor
belt
machine
threading
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
Application number
EP01913919A
Other languages
German (de)
English (en)
Other versions
EP1264044A1 (fr
Inventor
Ismo Kallio
Juha Laitio
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Oy filed Critical Metso Paper Oy
Publication of EP1264044A1 publication Critical patent/EP1264044A1/fr
Application granted granted Critical
Publication of EP1264044B1 publication Critical patent/EP1264044B1/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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the invention relates to a method and device for conveying a tail.
  • the method complies with the appended claim 1, and the device is of the type presented in the preamble of the appended claim 4.
  • One known way to transfer the narrow tail in a controlled manner is to utilize suction belts driven at the threading speed.
  • the air permeable suction belts form loops that travel via reversing rolls, the tail being sucked against the upper surfaces of the loops by means of a suction arranged inside each loop.
  • Typical examples of tail threadings by means of suction belt loops are disclosed for instance in the US patents 3355349 and 4022366 and in the European patent 232689.
  • US 4,692,215 discloses an apparatus for conveying a web lead-in strip in a paper machine.
  • a conveyor belt is arranged in a loop around one or more reversing rolls and the lead-in strip is arranged to adhere the belt through a vacuum.
  • the apparatus can be pivoted sideways to direct the lead-in strip precisely into the rope gap.
  • the problem is that the travel of the tail is unstable before it enters the space between the ropes or belts, primarily due to forces in the lateral direction.
  • the tail can be tightened against the rolls during the threading, wherein in diagonal threading the edge of the tail is tightened and the risk that the tail will break is increased.
  • the amount of paper passed between the ropes or the belts is poorly controllable.
  • the method according to the invention is primarily characterized in what will be presented in the characterizing part of the appended claim 1.
  • the device according to the invention is characterized in what will be presented in the characterizing part of claim 4.
  • the method according to the invention can be applied in all vacuum transfer belts.
  • the threading of the tail is implemented at that stage when it is devoid of substantial tension in the machine direction, i.e. when the tail is slack in such a manner that it is not yet tightened against the rolls.
  • the belt conveyor feeding the tail between the threading ropes or belts is transferred to a suitable position during threading. Negative pressure affects through the belt of the belt conveyor, said negative pressure keeping the tail in its place on the surface of the belt.
  • the belt conveyor is turned automatically and at the correct moment during threading so that the belt conveyor guides the tail away from between the ropes or belts.
  • the belt conveyor is turned with respect to the turning point advantageously in the beginning of the belt. Because the turning of the belt conveyor is conducted before the tail is tightened against the roll, the tail enters the space between the ropes or belts in a stable manner and the edge is not tightened under the forces that affect in the lateral direction.
  • the method according to the invention can be applied in all vacuum transfer belts, in which the tail is passed on a vacuum belt between threading ropes or belts. In threading tests by a pilot machine, the threading conducted by means of the method according to the invention raised the percentage of success to 75%, whereas experiments show that when prior art methods are used, the percentage of success is 33%.
  • the running speed in the test was 1,800 m/min.
  • Figs. 1a to 1b show a method according to the state of art for threading a tail.
  • the tail T is separated from a web unwound from a reel R.
  • the tail T is tightened against the roll 1, and travels in this tight state to the point 2 in which it is passed between the threading ropes or belts.
  • the tail T is guided by a belt conveyor 3, on top of which the tail T is arranged to fasten itself by means of negative pressure affecting through the belt of the belt conveyor.
  • the tail T travels in an angle with respect to the machine direction, wherein laterally loading forces are applied on the other edge of the same, said forces being capable of causing the breaking of the tail T.
  • Figs. 2a to 2c show a method according to the invention for threading a tail.
  • the tail T is separated from a web unwound from a reel R.
  • the threading is conducted at that stage during the travel of the tail T when said tail is slackened and conveyed to the point 2 where it is passed between the threading ropes or belts.
  • the tail T is guided by a belt conveyor 4, on top of which the tail T is arranged to fasten itself by means of negative pressure affecting through the belt of the belt conveyor.
  • the belt conveyor comprises reversing rolls 4a and a belt 4b, which belt can e.g. be made of the wire material of the paper machine.
  • the negative pressure can be arranged in such a manner that a suction device is placed inside the suction belt loop, which device is connected to the lower surface of the belt and effects a holding suction through the air permeable suction belt.
  • the suction device can be a vacuum box sealed against the lower surface of the belt, which is connected to the suction.
  • the suction box can be divided into successive zones, or several suction boxes can be arranged successively, and these zones or suction boxes may contain negative pressures which can be adjusted separately.
  • the tail T which is substantially strainless, i.e. slack, is arranged to travel to the point 2 in such a manner that during the travel of the tail T under the control of the belt conveyor 4, said tail T is transferred more to the longitudinal direction of the machine.
  • Fig. 2c the lateral movement of the belt conveyor 4 is illustrated by means of an arrow M.
  • the belt conveyors are typically located in an angle with respect to the longitudinal direction of the machine when the threading begins.
  • the movement of the belt conveyor 4 in the direction of arrow M is arranged by turning the belt conveyor 4 with respect to a suitable turning point.
  • the turning function effective at the turning point can be a bearing arrangement or the like.
  • the motion of the belt conveyor is automatic, the timing is precise and relates to the threading sequence.
  • the invention is not restricted to the description above, but it may vary within the scope of the claims.
  • the main aspect of the invention is that the tail is conveyed on a belt conveyor, which can be moved in the width direction of the machine during threading by turning it around a suitable turning point.

Landscapes

  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Advancing Webs (AREA)
  • Steroid Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Claims (5)

  1. Procédé de transport d'une queue dans une machine à papier ou similaire, dans lequel une queue (T) séparée d'une toile de papier est transportée vers l'avant sur une distance fixe le long d'un tapis roulant en mouvement (4) transportant la toile de papier en maintenant la queue collée au moyen d'une aspiration agissant à travers le tapis roulant, le tapis roulant étant situé de sorte à former un angle avec la direction longitudinale de la machine à papier ou similaire au début de l'enfilage, caractérisé en ce que la queue (T) essentiellement sans tension est transportée sur le tapis roulant (4) qui est retourné autour d'un point de retour pendant l'enfilage dans la direction transversale de la machine à papier ou similaire de telle manière que la queue, pendant sont déplacement, est transférée plus dans la direction longitudinale de la machine à papier ou similaire.
  2. Procédé selon la revendication 1, caractérisé en ce que le point de retour est situé au début du tapis roulant (4) dans le sens d'entrée de la toile de papier.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le tapis roulant (4) est retourné au moyen d'une fonction automatique, minutée avec précision, qui se rapporte à la séquence d'enfilage.
  4. Machine à papier comprenant un tapis roulant (4) pour faire avancer une queue (T) dans une machine à papier ou similaire, qui comprend une bande (4b) qui tourne autour de rouleaux de retournement (4a), au travers de laquelle une aspiration produit ses effets, laquelle bande est disposée pour être retournée autour d'un point de retour dans la direction transversale de la machine au moyen d'une fonction automatique, minutée avec précision, qui se rapporte à la séquence d'enfilage.
  5. Machine à papier selon la revendication 4, caractérisée en ce que le point de retour est situé au début du tapis roulant (4) dans le sens d'entrée de la toile de papier.
EP01913919A 2000-03-03 2001-03-01 Procede et dispositif de convoyage d'une pointe de bande de papier Expired - Lifetime EP1264044B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20000500A FI20000500A0 (fi) 2000-03-03 2000-03-03 Päänvientimenetelmä
FI20000500 2000-03-03
PCT/FI2001/000204 WO2001065006A1 (fr) 2000-03-03 2001-03-01 Procede et dispositif de convoyage d'une pointe de bande de papier

Publications (2)

Publication Number Publication Date
EP1264044A1 EP1264044A1 (fr) 2002-12-11
EP1264044B1 true EP1264044B1 (fr) 2004-07-14

Family

ID=8557837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01913919A Expired - Lifetime EP1264044B1 (fr) 2000-03-03 2001-03-01 Procede et dispositif de convoyage d'une pointe de bande de papier

Country Status (6)

Country Link
EP (1) EP1264044B1 (fr)
AT (1) ATE271159T1 (fr)
AU (1) AU2001239332A1 (fr)
DE (1) DE60104289T2 (fr)
FI (1) FI20000500A0 (fr)
WO (1) WO2001065006A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI69145C (fi) * 1984-07-05 1985-12-10 Valmet Oy Anordning i en pappersmaskin vid transport och styrning av banans spetsdragningsband
DE29620474U1 (de) * 1996-11-23 1997-01-16 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Überführeinrichtung zur Überführung einer Faserstoffbahn in einer Papiermaschine

Also Published As

Publication number Publication date
DE60104289T2 (de) 2004-11-18
EP1264044A1 (fr) 2002-12-11
ATE271159T1 (de) 2004-07-15
AU2001239332A1 (en) 2001-09-12
DE60104289D1 (de) 2004-08-19
WO2001065006A1 (fr) 2001-09-07
FI20000500A0 (fi) 2000-03-03

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