[go: up one dir, main page]

WO1998031874A1 - Procede et concept d'installation permettant de decouper et d'enrouler une bande d'amorce d'une bande continue de papier ou de carton - Google Patents

Procede et concept d'installation permettant de decouper et d'enrouler une bande d'amorce d'une bande continue de papier ou de carton Download PDF

Info

Publication number
WO1998031874A1
WO1998031874A1 PCT/FI1998/000019 FI9800019W WO9831874A1 WO 1998031874 A1 WO1998031874 A1 WO 1998031874A1 FI 9800019 W FI9800019 W FI 9800019W WO 9831874 A1 WO9831874 A1 WO 9831874A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
lead
roll
wire
guide roll
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.)
Ceased
Application number
PCT/FI1998/000019
Other languages
English (en)
Inventor
Tuomo Juvakka
Pekka Matilainen
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
Valmet 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 Valmet Oy filed Critical Valmet Oy
Publication of WO1998031874A1 publication Critical patent/WO1998031874A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D21G9/0072—Devices for threading a web tail through a paper-making machine using at least one rope

Definitions

  • the invention concerns a method and an equipment concept in the cutting and threading of the lead-in strip of a paper/board web in the final end of the dryer section of a paper/board machine.
  • Tail Shooters are known, i.e. a solution of equipment in which, after the cutting of the lead-in strip, the lead-in strip is guided by means of separate blowings in a free gap into a rope gap formed by ropes, being transferred further in the paper machine.
  • said Tail Shooter equipment picks up the lead-in strip from the doctor of the last drying cylinder and shoots it over a pick-up plate and a transfer plate into the rope gap.
  • said blowing of the lead-in strip into the rope gap requires different set values.
  • a novel type of threading of the lead- in strip is suggested for the final end of the dryer section.
  • various threading devices which pick up the web from a doctor.
  • mechanical cutting of the lead-in strip is employed in combination with different types of blowing or with a device for the transfer of the lead-in strip.
  • Said transfer device may further be based on a vacuum sucked under the lead-in strip.
  • a problem of all of the devices that pick up the lead-in strip from a doctor is the slackness arising in the strip, which slackness requires a rather high difference in speed between the dryer section and the subsequent unit for the time of threading. Said difference in speed must then be reduced after the strip has become sufficiently tight in order that the strip should not be cut off.
  • the lead-in strip is cut towards the end of the dryer section by means of a cutter, which is preferably a water cutter, before the last drying cylinder.
  • the lead-in strip thus formed is transferred onto an upper drying cylinder and guided by means of various blowings into a lower position into connection with a suction cylinder, preferably a so-called Vac Roll, placed in said lower position.
  • a Vac Roll is a cylinder construction, out of whose interior free from suction boxes a vacuum is applied to the entire interior space in the cylinder and further through the perforations in the cylinder mantle to grooves provided on the cylinder face, in which grooves the holes passing through the mantle terminate at one of their ends.
  • the grooves are preferably annular grooves which pass circumferentially on the cylinder face. In this way the web can be kept in contact with the wire face by means of the vacuum applied through the wire.
  • the run of the lead-in strip is supported, in the way described above, by applying a blowing to the lead-in strip and by pressing it into contact with the wire face.
  • the lead-in strip adheres to the suction cylinder, to the wire drawn over said cylinder.
  • the lead-in strip is passed further upwards, preferab- ly supported by air blowings, onto the guide roll E.
  • said rope draw is preferably placed in connection with the guide roll so that the gap between the ropes of the rope draw T 1 ; T 2 is placed at the inlet side of the roll E, in which case, by means of the blowing L2, the lead-in strip is guided to the side into the rope gap C placed at the side of the roll and further, between the ropes T j ,T 2 , for example, to the reel-up F.
  • the guide roll E can also be a roll provided with a vacuum block and with a pressure block, in which case the rope gap can be placed after said roll.
  • the vacuum block of the guide roll E the lead-in strip is picked up out of connection with the wire H j and, having been separated by the pressure block in the guide roll E, the strip is transferred further and, shifted by lateral blowing, into the rope gap placed after the guide roll E and by means of the rope draw, for example, to the reel-up.
  • Figure 1 A shows an embodiment of the invention, in which the dryer section concept comprises formation of a lead-in strip in accordance with the invention and transfer of said strip further and out of connection with the group of drying cylinders.
  • Figure IB illustrates cutting of the lead-in strip before the drying cylinder K 4 .
  • Figure 1C illustrates the transfer of the lead-in strip into connection with the guide roll E.
  • Figure ID illustrates the blowing that supports the lead-in strip and that is produced by means of an air jet L j applied from the beam of the doctor placed in a position below the drying cylinder K 4 .
  • the figure further shows a blow beam placed at the opposite side of the wire, a vacuum being produced at said side of the wire by means of the blowing applied from said beam, and a holding force in itself known being applied by means of the vacuum to the lead-in strip through the wire.
  • Figure IE illustrates blowing of the lead-in strip into the rope gap right before the guide roll E.
  • Figure IF illustrates the forming of the rope gap ahead of the guide roll E.
  • Figure 2 shows an embodiment which is in other respects similar to Fig. 1A, but in which the locations of the suction cylinders and the drying cylinders as compared with Fig. 1A are inverse: the suction cylinders are placed above and the drying cylinders below in the group.
  • Figure 3 shows an embodiment of the invention in which the web is carried in the other respects in a way similar to the preceding embodiments, except that in this embodiment the guide roll E includes vacuum and pressure blocks and perforations passing through the roll mantle at said blocks, in which connection, by means of the suction applied through the vacuum block, the lead-in strip is picked up from the face of the wire, and by means of the blowing applied by means of the pressure block, the lead-in strip is separated from the guide roll, in which connection it can be transferred, by means of the lateral blowing applied after the guide roll E, into the rope draw Tr ,T 2 placed after the guide roll, into the rope gap C formed by its ropes T 1 ,T 2 . After this the lead-in strip runs by means of the rope draw further between the ropes T j ,T 2 .
  • Figure 4 shows an embodiment of the invention in which the guide roll E is conventional and the wire is passed over the guide roll onto the wire alignment roll D.
  • the lead-in strip is supported on the wire run between the guide roll E and the wire alignment roll D by keeping the strip in contact with the lower face of the wire Hi by means of a vacuum.
  • the web is transferred into the rope gap between the ropes T and T 2 and further, for example, to the reel-up.
  • the lead- in strip 20 can also be passed as a ropeless draw so that it is guided on support of blowings from the wire guide roll D to the reel-up.
  • Figure 5A is an illustration in part of the guide roll E.
  • Figure 5B illustrates an embodiment of the guide roll E 10 which includes a vacuum block and a pressure block.
  • Figure 5C illustrates a second embodiment of the guide roll E 20 and of the transfer of the lead-in strip.
  • Fig. 1A shows a first preferred embodiment of the invention.
  • the last group R n of drying cylinders shown in the figure comprises the drying cylinders Ki ,K 2 ,K 3 and K 4 .
  • the suction cylinders S and S 2 i.e. the so-called Vac Rolls, are placed in lower positions.
  • the second drying cylinder K 2 is placed in the construction slightly below the level of the suction cylinders.
  • the web W is passed onto the first drying cylinder K j in said group R JJ of drying cylinders.
  • the wire H is passed onto the drying cylinder Ki to its upper position and, along with the face of the drying cylinder, onto the wire alignment roll Di placed between the drying cylinders Ki and K 3 and further onto the drying cylinder K 3 and from it onto the suction cylinder S j and further in the group.
  • the paper/board web W is passed from the drying cylinder Ki onto the lower drying cylinder K 2 , and it runs as pressed against said cylinder and supported by the outside wire H 2 , which is passed over the guide rolls g ⁇ ,g 2 and g 3 .
  • the web W is passed into the nip between the drying cylinder K 3 and the wire H j , from which the web is passed onto the lower suction cylinder Si , along whose face it runs by the effect of the vacuum produced in the interior of the suction cylinder S 1 ; which vacuum is further applied as a web holding force through the perforations in the mantle of the suction cylinder.
  • the suction cylinder S j comprises grooves on its face, in which grooves the holes in the mantle terminate, and through the grooves a rather wide circumferential holding force is applied to the web W guided on the outside.
  • the suction cylinder Si From the suction cylinder Si the web W is passed along with the wire ⁇ i ⁇ onto the fourth drying cylinder K 4 and further, meandering in loop shape, from said drying cylinder K onto the lower suction cylinder S 2 , which is similar to the suction cylinder S j described above. From the suction cylinder S 2 the web is passed further onto the paper guide roll E and from it further to the reel-up F.
  • the last group in the dryer section may also consist exclusively of single- wire draw.
  • the preferred arrangement of formation of the lead-in strip in accordance with the invention as shown in Fig. 1A comprises a cutter 10, preferably a liquid cutter and most appropriately a water cutter, in the position B j between the suction cylinder S j and the drying cylinder K 4 .
  • the lead-in strip 20 is cut in the position Bi by means of the cutter 10.
  • the cutter 10 is preferably a liquid cutter and most appropriately a water cutter. It applies a pressurized water jet against the face of the web W to be cut.
  • the web portion adjacent to the lead-in strip is transferred into the pulper after the cylinder K 4 by means of the doctor 11, whose blade 11a is fitted to be pressed against the lower face of the drying cylinder K 4 .
  • the air jet L j a so-called doctor jet, produced from the blow nozzle 50 and the blow beam 12, which is fitted at the opposite side of the wire H j , which produces a vacuum at said side of the wire, and which is in itself known, support the transfer of the lead-in strip 20 further onto the suction cylinder S 2 , by means of whose vacuum the lead-in strip, which was cut by means of the cutter 10, preferably a liquid cutter, is transferred further along with the face of the suction cylinder S 2 and transferred by means of the air blowing L ⁇ (Fig. IE), into the rope gap C formed by the ropes T ⁇ and T 2 and placed after the Vac Roll S 2 at the inlet side of the paper guide roll E.
  • Fig. IE air blowing L ⁇
  • the common rope path of the ropes T f ,T 2 is passed into the rope groove placed at the end of the paper guide roll E.
  • the rope path of the ropes Ti and T 2 passes up to the reel-up F.
  • the lead-in strip 20 is carried between the ropes Ti and T 2 up to the reel-up F.
  • Fig. IB is a more detailed illustration of the position B j of the water cutter in accordance with the invention between the suction cylinder S j and the drying cylinder K 4 .
  • the lead-in strip 20 is cut by means of a water cutter 10 in the way shown in Fig. IB.
  • the lead-in strip 20 is carried onto the drying cylinder K 4 and from it further onto the lower suction cylinder S 2 and further onto the paper guide roll E.
  • Fig. ID is a more detailed illustration of said threading of the lead-in strip.
  • the web itself, adjacent to the lead-in strip 20, is passed down through the gap between the last drying cylinder K 4 and the last suction cylinder S 2 from the last drying cylinder K 4 .
  • a blow beam 12 through which an air jet is produced along the face of the wire Hi , and further, thereby, a vacuum is produced at said side of the wire. In this way a holding suction or holding force is still applied by means of a vacuum through the wire Hi to the lead-in strip 20.
  • the lead-in strip 20 runs further in connection with the lower suction cylinder S 2 , by means of the vacuum produced in the suction cylinder S 2 , in contact with the wire face and meandering upwards onto the paper guide roll E, the lead-in strip being blown into the rope gap C placed in connection with said paper guide roll E between the ropes Ti and T 2 by means of a separate blow nozzle 21.
  • the blow air jet L2 shifts the lead-in strip 20, in relation to the longitudinal direction of the machine, towards the side into the rope draw T 1 ; T 2 placed at the side of the run of the web and the wire.
  • Fig. IE shows an embodiment of the transfer of the lead-in strip into the rope gap C related to the construction of Fig. 1A.
  • the blowing 1 ⁇ of air is applied from the blow pipe 21 to the lead-in strip 20 from the middle area of the web run in the machine towards the side.
  • the lead-in strip 20 is shifted towards the side into the gap C between the ropes T ⁇ ,T 2 shown in Fig. IF and further onto the paper guide roll E and further up to the reel-up as carried by the rope path T ⁇ ,T 2 between the ropes T j and T 2 .
  • Fig. IF illustrates the formation of the rope gap C by means of the ropes T and T 2 .
  • Fig. 2 shows an alternative drying cylinder concept, which is in other respects similar to the concept shown in Fig. 1A, but in which the locations of the drying cylinders and suction cylinders are different.
  • the suction cylinders Si and S 2 are placed at the top and the drying cylinders K 1 ? K 2 ,K 3 and K 4 at a level below them.
  • the arrangements of cutting the lead-in strip and passing it into the rope gap C are, in the other respects, the same as those in the embodiment shown in Fig. 1A.
  • Fig. 3 shows an embodiment of the invention in which the paper guide roll E 10 is provided with an inner vacuum block or vacuum sector and with an inner pressure block or pressure sector placed after the vacuum block (as viewed in the running direction of the web).
  • the paper guide roll comprises perforations in the roll mantle, through which perforations either a pressure or a vacuum is applied to the lead-in strip 20 (depending on the block).
  • the vacuum block and the pressure block can be placed at an end of the paper guide roll.
  • the whole paper guide roll, across its length is provided with a vacuum block and a pressure block.
  • Figs. 1A...1F The embodiment of Fig. 3 differs from the embodiment shown in
  • Figs. 1A...1F expressly in respect of the construction of the paper guide roll E 10 and in the respect that, for the transfer of the lead-in strip 20, at least before the paper guide roll E 10 , no rope path or rope draw is used, but the lead-in strip 20 is transferred from the suction roll S 2 onto the upper paper guide roll E 10 , which comprises a vacuum block 22 and a pressure block 23.
  • the lead-in strip 20 is transferred further from said paper guide roll E 10 provided with said pressure arrangement to the rope draw Ti ,T 2 , which is placed after the pressure zone of said paper guide roll E i0 -
  • the blow sector has been fitted so that said blowing, besides separating the lead-in strip, also prevents winding of the strip or, if the blowing has been extended to the entire length of the roll, also winding of the web around the paper guide roll E 10 .
  • Fig. 4 shows an embodiment of the invention which is in other respects similar to the embodiment shown in Figs. 1A...1F, but in which the wire Hi is passed from the paper guide roll E 20 further onto a wire guide roll D.
  • the wire H j is fitted to run over the paper guide roll E 20 onto the wire guide roll D, in which case the web W runs between the guide roll E 20 and the wire H j .
  • the lead-in strip 20 is also transferred from the suction cylinder, i.e.
  • the paper guide roll which includes a suction-blow zone, preferably comprises a doctor 24 on its lower face, which doctor prevents winding of the paper web around the paper guide roll E 10 .
  • a separate rope draw T ⁇ ,T 2 may be placed in the vicinity of the wire guide roll D, or the lead-in strip can be passed further by means of support blowings produced from blow nozzles, in which case the threading can be a so-called ropeless threading in its final stage, e.g. to the reel- up area F.
  • Fig. 5 A is an axonometric illustration partly in section of a guide roll E which has been mounted revolving.
  • the roll E comprises bearings Gi ,G 2 , on whose support it is fitted revolving.
  • the roll mantle E' is connected with the shafts n j and n 2 , on whose support the roll E revolves.
  • Fig. 5B shows an embodiment of the guide roll E 10 .
  • the guide roll E 10 comprises a vacuum block 22 and a pressure block 23 at its end.
  • the blocks have been formed by means of partition walls 100,101 ,102 and 104, and the roll mantle E 10 ' includes a perforation in its face at least in the area of the blocks, in which connection, through the perforation 103, which holes 103 extend through the roll mantle, a holding suction or a detaching blowing is applied to the lead-in strip, depending on the block.
  • the roll mantle provided with a perforation is connected to shafts n ⁇ n ⁇ which have been mounted by means of bearing means G j and G 2 .
  • the blocks 22 and 23 have been formed at an end of the roll.
  • An embodiment is also possible in which the blocks 22 and 23 have been formed across the entire length of the roll.
  • Fig. 5C shows an embodiment of the guide roll E 20 .
  • the construction of the guide roll E 20 is similar to that of the guide roll E 10 .
  • the lead-in strip runs between the wire H and the face of the roll mantle E 20 ' of the guide roll E 20 and further, for example, by means of a vacuum that has been produced from the opposite side of the wire.
  • the vacuum is produced by means of a blow box 25 in itself known.

Landscapes

  • Paper (AREA)

Abstract

Cette invention concerne un procédé et un concept d'installation qui permettent de découper et d'enrouler la bande d'amorce (20) d'une bande continue de papier ou de carton au niveau de l'extrémité finale de la section de séchage d'une machine de fabrication de papier et/ou de carton. Ce procédé consiste à faire passer la bande continue (W) de papier ou de carton sur des cylindres de séchage (K1, K2, ...) et sur des cylindres d'aspiration (S1, S2, ...) tout en faisant serpenter la forme de la boucle. La bande d'amorce (20) est ensuite coupée par un outil de coupe (10) avant le dernier cylindre de séchage (K4) du groupe (Rn). Une fois coupée, la bande d'amorce (20) passe sur ledit cylindre de séchage (K4) et, de là, sur le cylindre d'aspiration (S2) avant de passer enfin sur un rouleau de guidage (E, E10, E20).
PCT/FI1998/000019 1997-01-17 1998-01-13 Procede et concept d'installation permettant de decouper et d'enrouler une bande d'amorce d'une bande continue de papier ou de carton Ceased WO1998031874A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI970196A FI105937B (fi) 1997-01-17 1997-01-17 Menetelmä ja laitekonsepti paperirainan/kartonkirainan päänvientinauha leikkauksessa ja viennissä paperikoneen/kartonkikoneen kuivatusosan loppupäässä
FI970196 1997-01-17

Publications (1)

Publication Number Publication Date
WO1998031874A1 true WO1998031874A1 (fr) 1998-07-23

Family

ID=8547653

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000019 Ceased WO1998031874A1 (fr) 1997-01-17 1998-01-13 Procede et concept d'installation permettant de decouper et d'enrouler une bande d'amorce d'une bande continue de papier ou de carton

Country Status (2)

Country Link
FI (1) FI105937B (fr)
WO (1) WO1998031874A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232554A (en) * 1990-11-27 1993-08-03 J.M. Voith Gmbh Threading the web into a twin wire dryer group
US5555638A (en) * 1994-03-29 1996-09-17 Valmet Corporation Method for contact drying a paper web and a dryer section of a paper machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232554A (en) * 1990-11-27 1993-08-03 J.M. Voith Gmbh Threading the web into a twin wire dryer group
US5555638A (en) * 1994-03-29 1996-09-17 Valmet Corporation Method for contact drying a paper web and a dryer section of a paper machine

Also Published As

Publication number Publication date
FI970196L (fi) 1998-07-18
FI970196A0 (fi) 1997-01-17
FI105937B (fi) 2000-10-31

Similar Documents

Publication Publication Date Title
US4551203A (en) Method and arrangement for guiding a paper web from the press section to the drying section
EP1543194B1 (fr) Formation de nappe de papier ou de carton dans un formeur double toile
US4953297A (en) Method of and device for pocket ventilation in the drying section of a paper machine, in particular for high-speed paper machines
US4807371A (en) Apparatus for maintaining the edges of a web in conformity with a dryer felt
EP0575381B1 (fr) Appareil destine a fabriquer une bande sechee de papier
US4932138A (en) Method and device for threading a web around drying cylinders
US5873180A (en) Papermaking dryer section with partitioned vacuum box for threading
WO2000009804A1 (fr) Machine a papier: methode et dispositif pour le transfert d'une bande d'une zone anterieure a la partie presse
US3419203A (en) High speed paper making machine
EP0865532B1 (fr) Procede et dispositif permettant d'empecher la rehumidification d'une feuille dans un formeur de feuilles
US4081320A (en) Method and apparatus for separating a fibrous web from a foraminous belt
US5445055A (en) Method for cutting of the leader of the web in a paper or board machine in the drying section of the machine
SE541606C2 (en) A paper making machine and a method of cutting a fibrous web in a paper making machine
WO1998031874A1 (fr) Procede et concept d'installation permettant de decouper et d'enrouler une bande d'amorce d'une bande continue de papier ou de carton
US6916405B2 (en) Process and device for drying of a material web
US6325894B1 (en) Press section and method of using the same
US6346171B1 (en) Paper making machine using separate metal screens for press and dryer cylinders
US6662468B2 (en) Dryer section of a paper or board machine
US7192507B2 (en) Machine for producing a fibrous material web
US6823606B2 (en) Dryer section
CN112352077B (zh) 压榨部
US6413375B2 (en) Paper machine
US5647960A (en) Press section and method for starting and operating thereof
US6367164B1 (en) Dryer section
US6668469B2 (en) Removal device

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR CA CN JP KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 1998533802

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase