EP0611716A2 - Aufbau für die Abwicklerseite einer Linie von unabhängigen Maschinen zum Handhaben von Papierbahnen - Google Patents

Aufbau für die Abwicklerseite einer Linie von unabhängigen Maschinen zum Handhaben von Papierbahnen Download PDF

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Publication number
EP0611716A2
EP0611716A2 EP94102426A EP94102426A EP0611716A2 EP 0611716 A2 EP0611716 A2 EP 0611716A2 EP 94102426 A EP94102426 A EP 94102426A EP 94102426 A EP94102426 A EP 94102426A EP 0611716 A2 EP0611716 A2 EP 0611716A2
Authority
EP
European Patent Office
Prior art keywords
web
roll
felt
unwinder
assembly
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
EP94102426A
Other languages
English (en)
French (fr)
Other versions
EP0611716A3 (en
EP0611716B1 (de
Inventor
Pentti Rautiainen
Stig Renvall
Chris Bertram
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 Paper Machinery 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 Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Publication of EP0611716A2 publication Critical patent/EP0611716A2/de
Publication of EP0611716A3 publication Critical patent/EP0611716A3/en
Application granted granted Critical
Publication of EP0611716B1 publication Critical patent/EP0611716B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1857—Support arrangement of web rolls
    • B65H19/1863—Support arrangement of web rolls with translatory or arcuated movement of the roll supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1805—Flying splicing, i.e. the expiring web moving during splicing contact
    • B65H19/181—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll
    • B65H19/1821—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll the replacement web being accelerated or running prior to splicing contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/06—Advancing webs by friction band
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/413—Supporting web roll
    • B65H2301/4136—Mounting arrangements not otherwise provided for
    • B65H2301/41361—Mounting arrangements not otherwise provided for sequentially used roll supports for the same web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/463—Splicing splicing means, i.e. means by which a web end is bound to another web end
    • B65H2301/4631—Adhesive tape
    • B65H2301/46312—Adhesive tape double-sided

Definitions

  • the present invention relates to an assembly according to the preamble of claim 1 suited for use in an off-machine coating line or other paper web finishing line in the handling of a paper web received from an unwinder and then routing said web to a coating machine.
  • the paper web manufactured in a paper machine is finished either using on-machine equipment directly following the paper machine, whereby the base sheet outgoing the paper machine is coated and finished with equipment having a width and speed compatible with the those of the paper machine, or alternatively, using off-machine equipment, whereby the output of a single paper machine can be handled by a plurality of finishing equipment.
  • on-machine systems are their high productivity and the possibility of attaining a finished product in a single process.
  • off-machine equipment the properties of the finished product can be varied in a more flexible manner and often they can give higher quality.
  • a coating line can include, e.g., an unwinder, several coater stations, dryers and a calender. The last unit in the line is a rewinder.
  • Paper web handling in off-machine equipment occurs in the following manner.
  • Base web rolls manufactured in a paper machine are transferred to the finishing line and lifted onto the unwind stands to wait for their finishing turn. After the preceding roll is finished, a new base web roll can be transferred onto the unwind stand.
  • Roll change is made by stopping the line, then feeding the web tail of the new roll through the line using low speed, and finally accelerating the web to the normal running speed. Because the roll change in this manner is slow, the current practice is to aim at roll changes without stopping the equipment. To accomplish this, the diameter of the roll being unwound is allowed to become sufficiently small, then the web speed is reduced by a suitable amount, the roll being finished is lifted from the unwind stand proper to an secondary stand, and another roll is transferred to the unwind stand proper.
  • a two-sided adhesive tape or a similar tack splicing means To the web tail of the new roll is attached a two-sided adhesive tape or a similar tack splicing means and the tangential speed of the roll is accelerated equal to the actual web speed, whether normal or reduced.
  • the perimeter of the new roll is pressed against the perimeter of the preceding roll, whereby the splicing tape adheres to the running web and the web tail of the new roll is fed with the running web through the entire line. Subsequently, the web of the first, finished roll is cut and the speed of the finishing line is accelerated to normal, unless otherwise desired.
  • the web passes to a first coater, then to the dryers, to the second coater station, and then further alternately to dryers and coaters, depending on how many coater stations are included in the line and how many coats are being applied to the end product.
  • the web can be calendered in a calender included in the line, or alternatively, in a separate calender.
  • the web is again wound into a roll by means of a rewinder.
  • a further object of the invention is to achieve an assembly capable of handling webs with a higher initial moisture content than conventional in unwinding with off-machine equipment.
  • the invention is based on supporting the first web paid off from the first, expiring roll by means of a support felt meanwhile the web of the expiring roll is being spliced to the web of the second, full roll by pressing the web of the first roll backed by the support felt by means of a splicing roll against the perimeter of the second roll.
  • the assembly according to the invention is characterized by what is stated in the characterizing part of claim 1.
  • the invention offers significant benefits.
  • the principal benefit of the invention is the reduction of web breaks during roll change.
  • the duration of finishing line shutdown is clearly reduced owing to the lower number of web breaks.
  • Roll change can be made at higher speed than conventional, and with regard of concurrent web speeds, even at the maximum web speed of the finishing line, thus permitting the line to continuously operate at maximum efficiency.
  • the probability of web breaks can be reduced, because a base sheet of higher moisture content is less susceptible to web break during a disturbance than a dry base sheet.
  • the proportion of sulfate fibers in the base sheet can be reduced, whereby the price of the base sheet becomes lower and its opacity can be improved.
  • the basis weight of the base sheet can be reduced, in other words, a thinner base sheet can be used, whereby higher coat weight can be used in a finished grade of same final weight. The higher coat weight in turn provides improved printing properties.
  • a coating line is shown incorporating two coater stations 4, 7.
  • the First unit in the line is an unwinder 1. From the unwinder 1 the web being finished passes supported by a felt to a first dryer cylinder group 2. On the dryer cylinder 2 the damp web is dried to a suitable moisture content for applying the coat. Subsequent to drying, the web is routed to a first coater station 4. Next to coating, the web of now higher moisture content and the coat are dried with dryers 5.
  • the layout of Fig. 1 has first a set of three dryers, followed by a second dryer cylinder group 6 comprising three steam cylinders and three vacuum, or VAC, cylinders. The web is passes through the dryer cylinder group 6 supported by a felt.
  • the configuration can be complemented with three pulpers 11.
  • the pulpers 11 are placed under the framework, to the outgoing side end of the dryer cylinder groups 2, 6, 9.
  • the web is cut after the dryer cylinder group with the edge trimmer and guided to the pulper 11.
  • the edge strip travelling along with the web edge is guided through the line in a rope nip formed by rope carriers.
  • the knife of the edge trimmer is moved obliquely over the web, whereby the web can assume its normal width.
  • the unwinder 1 comprises a framework 14 carrying on its upper surface roll feed rails ending at the actual unwinder station, herein referred to as the primary unwinder station.
  • the primary unwinder station is shown in the diagram carrying the first full roll denoted by reference numeral 12.
  • transfer arms 15 of the unwinder having the expiring roll 13 held by chucks 27 at one ends of the arms.
  • the arms 15 are connected at their other ends to the frame part of arm assembly by means of a pivoting joint 26.
  • a dryer cylinder group 2 comprising three vacuum, or VAC, cylinders 20 and three steam cylinders 21.
  • VAC three vacuum, or VAC
  • the path of the support felt 3 in the system is as follows.
  • the felt 3 first passes the guide roll 17, where its direction is diverted to run downward, parallel with the web 16 received from the roll 13.
  • another guide roll 19 which acts to divert the felt toward the dryer cylinder group 2.
  • This dryer cylinder group 2 has a VAC roll 20 as the first cylinder.
  • the structure of the VAC roll is such that permits a vacuum to be applied to its inside, and as the roll surface is either porous or has a plurality of small holes, the vacuum sucks the felt 3 running on the roll 20 and the web 16 running on the felt to adhere to the roll.
  • the purpose of the VAC roll is to assure the adherence of the web to the felt 3, and a further purpose of the vacuum is to assure that the felt 3 travels smoothly rotated by the cylinder group 2 instead of excessively slipping on the rolls.
  • the felt 3 and the web pass to a steam cylinder 21.
  • the web 16 is in intimate contact with the surface of the cylinder 21 pressed by the felt 3.
  • an effective transfer of heat from the hot cylinder 21 to the web is attained, whereby the web is dried with the applied heat.
  • the felt and the web pass to the next VAC roll, a steam cylinder, and then once more to another VAC roll and a steam cylinder.
  • Adapted to the free sector of the steam cylinders 21 which in this case remains below the cylinders are adapted cleaning doctor blades 22 acting to remove coat debris possibly adhering to the surfaces of the steam cylinders 21.
  • the web 16 is separated from the felt 3 after the last steam cylinder.
  • the felt 3 is routed back via guide rolls to above the cylinder group onto a tension roll 25 from which the felt passes to the first guide roll 17, and the felt path thus forms an endless loop.
  • the web in turn is drawn from the steam cylinder 21 via a draw nip 24 to a first coater station 4.
  • the draw nip 24 is required in this embodiment, because a disturbance-free detachment of the web from the felt is desired and the distance of the first coater station 4 from the dryer cylinder group 2 is large.
  • the draw roll nip 24 serves to maintain constant web tension.
  • a web edge trimmer 23 which in the event of a web break cuts the web, which then passes into a pulper 11.
  • Fig. 3 With reference to Fig. 3, the unwinder 1 and its elements associated with the roll change are shown. It must be noted herein that due to the drafting scale used, not all details shown in Fig. 3 can be found in Figs. 1 and 2. At one ends of transfer arms 15 are mounted chucks 27 to which the expiring roll 13 is clamped for the duration of the roll change. As noted above, the support felt 3 passes to the unwinder 1 and is then diverted by means of a guide roll 17 to run parallel with the web 16 paid off from the expiring roll 13. Next on the path of the felt loop 3 is adapted a splicing roll 18.
  • the splicing roll 18 is mounted supported by a pivoting arm 30 and thus the roll 18 is movable by means of an air bellows 31, which is connected by a link rod to the pivoting arm 30.
  • the splicing roll 18 is shown in the position used for splicing the web of the new roll 12 to the web 16 of the expiring roll.
  • the unwinder 1 further includes a cutting knife 29.
  • the cutting knife 29 is adapted above the support felt 3 passing to the guide roll 17 so that the cutting point of the web 16 falls within that web length which remains between the roll 13 already transferred to the secondary stand and the first guide roll 17.
  • a support roll 28 which tensions the web 16 paid off from the roll in the secondary stand so that the web can be easily cut by a swing of the curved cutting knife 29.
  • the expiring roll 13 is shown lifted with the help of the transfer arms 15 to the secondary roll stand and the following, new roll 12 already lifted in the roll stand of the primary unwinder.
  • the roll 12 in the primary unwinder is shown still rotating freely.
  • Two-sided splicing tapes are placed on the surface of the roll 12 in the primary unwinder and the roll speed is already accelerated to the speed of the web 16 being unwound from the roll 13 resting on the secondary unwind stand.
  • the web being paid off from the secondary unwind stand meets the support felt 3 at the first guide roll 17 and travels thereafter supported by the felt 3.
  • the web 16 of the roll 13 is spliced to the outer surface of the roll 12 by means of two-sided splicing tape.
  • the splicing takes place so that the edge position of the tape is detected with the help of, e.g., a photocell which gives the actuator 31 of the splicing roll 18 a signal to press the web 16 received from the secondary unwinder via the felt 3 onto the surface of the roll 12 rotating in the primary unwind stand.
  • the curved cutting knife 29 severs the web 16 received from the secondary unwinder by a rapid swing from behind the support roll 28 onto the web 16. Subsequently, the web begins to be paid off from the new roll 12 in the primary unwinder.
  • Web breaks during the above-described phase have formed the majority of web breaks in coating lines.
  • the principal reason for the web breaks has been the large difference in web tension between the running web 16 and the spliced web paid off from the roll 12 starting to rotate in the primary unwinder, whereby a tearing jolt has been imposed on the new web as the web is tensioned after splicing.
  • the new web runs according to the invention supported by the felt 3, whereby any excessively rapid tensioning of the web is avoided, since the web is travelling with the felt 3 and the speed of the felt 3 does not change during the splicing nor after it.
  • the roll diameter becomes smaller and the support felt with its guide roll 17 and splicing roll 18 must be transferred closer to the roll 12 in order to prevent the web being paid off from the roll 12 from detaching from the support felt 3.
  • the felt 3 is provided with a tension roll 25 permitting the control of the felt 3 tenser or slacker. The movement of the tension roll 25 can also accommodate the tension change caused by the action of the splicing roll 18 on path of the felt 3.
  • the roll 12 in the primary unwind stand When the diameter of the roll 12 in the primary unwind stand is reduced to a preset minimum, the roll is lifted by means of the transfer arms 15 to the secondary unwind stand and the first guide roll 17 and the splicing roll 18 are transferred so much backward that the next new roll can be received into the primary unwinder. The next actual roll change is then effected again in the above-described manner.
  • draw roll nip 24 This nip assembly comprises two rolls, of which one is the draw roll and the other is a backing roll, and a doctor blade.
  • the draw roll nip 24 is located in the above-described embodiment after the dryer cylinder group 2, and its position in the machine direction is invariably located so that the nip is after the point where the web is detached from the support felt 3 but before the first coater station 4.
  • the draw roll nip 24 and the edge trimmer 23 perform several functions in the assembly. As the web is received from the unwinder 1 travelling on the support felt 3, it does not attain its normal web tension in the same manner as a web drawn unsupportedly in the conventional manner by means of draw rolls directly from a roll in a stand. Therefore, the web tension is advantageously controlled by means of the draw nip to make the web enter the subsequent process stages correctly tensioned. Further, the draw roll nip 24 assures that the web is positively detached from the support felt 3.
  • the edge trimmer 23 serves for the purpose of cutting the web if a disturbance should occur on the coating line.
  • the web is cut by transferring the trimmer knife obliquely across the web close to the other edge of the web and stopping the knife there before the web is entirely cut. In this marginal position the knife separates a narrow edge strip from the web that is then threaded forward in the line in a rope carrier nip. During this time, a major part of the web is routed to a pulper 11 and the winding of the web tail about the draw roll is prevented by virtue of the doctor blade. As soon as the disturbance is rectified, the knife of the edge trimmer 23 is moved back to its home edge, whereby the web assumes its full width threaded with the help of the rope carrier nip. In this manner, a rapid tail feed after web breaks is attained and the down times due to web breaks and other disturbances remains shorter.
  • the present invention can have alternative embodiments.
  • the invention comprises only the support felt 3, the first guide roll 17, the splicing roll 18, elements 25 for tensioning the felt and guide rolls for guiding the path of the felt 3.
  • the first guide roll can be omitted as the felt can be directly routed to the splicing roll 18.
  • the web need be taken without the help of the draw roll nip to the first coater station or other finishing equipment.
  • Such an assembly would find applications in feeding the web directly from an unwinder to some kind of a calender, whereby the calender provides the draw nip capable of detaching the web from the felt 3.
  • the equipment most typically comprises the draw roll nip 24 and at last one cylinder pair capable of assuring the adherence of the web to the felt.
  • Such cylinders are advantageously VAC cylinders and dryer cylinders, whereby the drying of the web can be performed prior to the entry of the web into a coater station or similar equipment.
  • the number and type of the cylinders are selected according to the required drying capacity and mechanical construction. Obviously, multiple different embodiments are possible for the guiding, tensioning and mechanical construction of the assembly.

Landscapes

  • Replacement Of Web Rolls (AREA)
  • Paper (AREA)
  • Fats And Perfumes (AREA)
  • Saccharide Compounds (AREA)
  • Bakery Products And Manufacturing Methods Therefor (AREA)
EP94102426A 1993-02-19 1994-02-17 Aufbau für die Abwicklerseite einer Linie von unabhängigen Maschinen zum Handhaben von Papierbahnen Expired - Lifetime EP0611716B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI930765 1993-02-19
FI930765A FI100003B (fi) 1993-02-19 1993-02-19 Sovitelma off-machine-paperinkäsittelylinjan aukirullaimen puoleisessa päässä

Publications (3)

Publication Number Publication Date
EP0611716A2 true EP0611716A2 (de) 1994-08-24
EP0611716A3 EP0611716A3 (en) 1995-11-08
EP0611716B1 EP0611716B1 (de) 1997-05-21

Family

ID=8537430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102426A Expired - Lifetime EP0611716B1 (de) 1993-02-19 1994-02-17 Aufbau für die Abwicklerseite einer Linie von unabhängigen Maschinen zum Handhaben von Papierbahnen

Country Status (6)

Country Link
EP (1) EP0611716B1 (de)
JP (1) JP3404481B2 (de)
AT (1) ATE153305T1 (de)
CA (1) CA2115912C (de)
DE (1) DE69403234T2 (de)
FI (1) FI100003B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032383A1 (en) * 1997-12-04 1999-07-01 Valmet Corporation Method and device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web
CN100439223C (zh) * 2006-04-30 2008-12-03 金东纸业（江苏）股份有限公司 超级压光机的手动换卷操作方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006000864T5 (de) * 2005-04-12 2008-02-28 Metso Paper, Inc. Offlinefertigbearbeitungsmaschine und Verfahren zur Fertigbearbeitung einer in einer Papier-/Kartonmaschine produzierten Faserbahn
IT201600117182A1 (it) * 2016-11-21 2018-05-21 Futura Spa Ribobinatrice.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH266384A (fr) * 1941-07-22 1950-01-31 Wood Newspaper Mach Corp Procédé pour unir l'extrémité extérieure d'une bande constituant un rouleau neuf à une bande se déroulant d'un rouleau qui s'épuise.
US3163375A (en) * 1962-09-24 1964-12-29 Kimberly Clark Co Unwind assembly for a papermaking machine
DE3115835A1 (de) * 1981-04-18 1982-10-28 Jagenberg-Werke AG, 4000 Düsseldorf Klebewalze in einer abwickelanlage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH266384A (fr) * 1941-07-22 1950-01-31 Wood Newspaper Mach Corp Procédé pour unir l'extrémité extérieure d'une bande constituant un rouleau neuf à une bande se déroulant d'un rouleau qui s'épuise.
US3163375A (en) * 1962-09-24 1964-12-29 Kimberly Clark Co Unwind assembly for a papermaking machine
DE3115835A1 (de) * 1981-04-18 1982-10-28 Jagenberg-Werke AG, 4000 Düsseldorf Klebewalze in einer abwickelanlage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032383A1 (en) * 1997-12-04 1999-07-01 Valmet Corporation Method and device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web
US6464163B1 (en) 1997-12-04 2002-10-15 Metso Paper, Inc. Method and device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web
US6651923B2 (en) * 1997-12-04 2003-11-25 Metso Paper, Inc. Method and device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web
CN100439223C (zh) * 2006-04-30 2008-12-03 金东纸业（江苏）股份有限公司 超级压光机的手动换卷操作方法

Also Published As

Publication number Publication date
EP0611716A3 (en) 1995-11-08
CA2115912A1 (en) 1994-08-20
FI930765A (fi) 1994-08-20
FI100003B (fi) 1997-07-15
EP0611716B1 (de) 1997-05-21
ATE153305T1 (de) 1997-06-15
DE69403234D1 (de) 1997-06-26
DE69403234T2 (de) 1997-11-06
JP3404481B2 (ja) 2003-05-06
JPH06255848A (ja) 1994-09-13
FI930765A0 (fi) 1993-02-19
CA2115912C (en) 2002-10-29

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