Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G1/00—Calenders; Smoothing apparatus
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G9/00—Other accessories for paper-making machines
  • D21G9/009—Apparatus for glaze-coating paper webs

Definitions

• the invention relates to a method of manufacturing a paper or board web, in which method the web is manufactured in an on-line manufacturing process, in which the web is passed from a paper or board machine directly to a finishing device/finishing devices.
• the invention also relates to a paper or board machine, which paper or board machine forms an on-line manufacturing process together with a finishing device/finishing devices.
• a problem in the production of a paper or board web has also been that if at some stage of production a web has been produced which is not suitable for the purpose desired in respect of its quality requirements, it has been necessary to run it into the pulper, from which it has been passed into pulp towers, in which connection the volumes of the pulp towers have been dimensioned to be large, for instance, such that they can hold the broke of 8 hours' running time.
• An object of the invention is to provide a solution to the problems described above.
• a particular object of the invention is to provide an arrangement by which the utilization rate of a paper or board machine is maximized and attempts are made to reach a situation where the paper machine can operate without interruption in spite of problems occurring in finishing devices.
• the method of manufacturing a paper or board web according to the invention is mainly characterized in that, in the method, the state of a finishing device/finishing devices is monitored and that, during a shutdown of a finishing device, said finishing device is bypassed and the web coming from the paper or board machine is wound into machine reels and/or treated by means of some finishing device/finishing devices and wound into machine reels.
• the paper or board machine according to the invention is in turn mainly characterized in that the paper or board machine comprises means for monitoring the state of the paper or board machine and a finishing device/finishing devices, as well as means for directing the web produced on the paper or board machine during a disturbance situation in a finishing device to a reel-up in order to be wound into machine reels and to be unwound later when allowed by the capacity of the machine.
• the state of the finishing devices is monitored in connection with the finishing devices and, when the web cannot be conducted to a finishing device for treatment, for example, because of a disturbance situation or roll replacement, the web is passed via other finishing devices or so as to be directly wound, and it is wound into a machine reel in order to be stored, from which machine reel the paper or board web is later unwound and finished, for example, during a shutdown of the paper machine caused by something other than a finishing device, or the machine reel is taken to a finishing device of another line of the mill or to a finishing device of another mill, either an on-line or an off-line finishing device, in order to be finished.
• the winding is performed either with a reel-up placed at the end of the machine or the winding is performed with a reel-up placed at a suitable location in connection with the finishing devices.
• unwind stations are also placed in connection with the finishing devices, from which stations the web can be passed so as to be finished during a shutdown of the other parts of the production line.
• the reel-up may also be such that it operates both as an unwind and as a windup station.
• the paper or board web production line comprises means for monitoring the state of the finishing devices and for controlling the production line such that, when there occurs a disturbance situation or a roll is replaced in a finishing device, the production line is controlled such that the web is passed so as to be reeled, and the wound paper reels are unwound and finished during a shutdown caused by a disturbance situation in the paper machine or by something other than a finishing device.
• a finishing device in connection with a finishing device there is an apparatus for unwinding the machine reel and it is also possible to pass the web from the unwind station to the reel-up and to run the finishing device as an independent off-line device.
• the unwind apparatus is placed, for example, in connection with a finishing device at a suitable location in the line, for example, on top of the machine or after the reel-up.
• This kind of equipment used in connection with the invention is advantageously as simple as possible, including primarily means needed for control of tension.
• the manufacturing line is provided with means required for tail threading and transfer of the web bypassing a finishing device in situations where the web is wound by means of the reel-up into machine reels to be placed in storage, and the web is thus not finished on-line.
• the web can also be passed to the reel-up through the finishing devices, in which connection the finishing devices are run, so to speak, with the stations open.
• the threading which bypasses a finishing device can be accomplished by means of separate equipment, for instance, at an edge of the web opposite to that of the tail threading proper, and the transfer of the web bypasses a finishing device most advantageously above or below.
• threading can be accomplished in a suitable manner known in itself.
• any threading methods known in themselves can be used for tail threading: manually, using threading ropes, threading bands, blowings, etc.
• the problems occurring in a finishing device do not drop the utilization rate of the entire production line. For instance, when a finishing device is out of operation because of a damaged roll, a new threading operation is performed and production is continued during replacement of the roll and the web is wound into machine reels.
• the unfinished machine reels are moved, for example, onto storage rails to wait and during the next shutdown, not caused by a finishing device, the machine reels are finished off-line.
• the roll replacement time is not critical because the web being produced can be stored on machine reels.
• the invention also enables running of paper and board grades which cannot be accomplished at on-line speeds, in which connection the machine reels run during roll replacement or another disturbance situation in a finishing device can be finished, when needed, into high-quality rolls at a lower speed during a subsequent shutdown instead of running down the entire line or running the output into the dry end pulper during roll replacement or another disturbance, as done today.
• a paper or board web from an adjacent machine or a neighbouring mill can be introduced into a finishing device before the initial end of the machine has been assembled.
• broke is wound into a reel on a reel-up, which broke can be transferred later into pulp towers or possibly to another suitable use.
• the volume of the pulp tower can be reduced to correspond, for instance, to a running time of three hours.
• the broke takes the smallest storage space.
• the invention can be applied in connection with all types of on-line finishing devices, for example, calenders and coating machines.
• the calender can be, for example, a multi-roll or a soft calender.
• the invention is used in producing on-line sack paper, White top liner, sack and liquid packaging board.
• This embodiment relates to an on-line calendering method in which, for examp ⁇ le, an O-,pt ,i- ⁇ D ⁇ we ⁇ l ⁇ l (trademark of the applicant) ca .lend.er i.s used . as a ca .lend ,er, _ l,.he web is passed to a reel-up after calendering.
• the invention is also suitable for use in connection with the manufacture of many types of board and paper, for example, in LWC paper production lines, in which, for example, an on-line two-side coating device marketed by the applicant under the trademark SymSizer and, for example, a calender marketed by the applicant under the trademark OptiLoad are used.
• Figure 1 schematically shows a basic application of the method according to the invention as a block diagram illustration.
• Figure 2A schematically shows an application of the method according to the invention when using the normal running mode.
• Figure 2B schematically shows the application shown in Fig. 2A when a finishing device is under maintenance.
• FIG. 2C schematically shows the application shown in Figs. 2A and 2B when the paper or board machine is under maintenance.
• a web produced on a paper or board machine 15 and dried on its dryer section 20 is passed to finishing devices, for example, to an intermediate calender 60, a coating machine 50 and therefrom to a calender 10 and further to a reel-up 30 and a storage 40.
• the finishing steps 60, 50, 10, 30 are monitored in monitoring units 61, 51, 11 and, during a possible shutdown of a finishing device 60, 50, 10, the web W that is being produced is passed to the reel-up 30 in order to be wound into machine reels and stored in the storage 40.
• the machine reel/reels in the storage 40 is/are unwound and the web is passed to the finishing devices, for example, to the intermediate calender 60 and/or to the coating machine 50 and/or to the calender 10 in order to be finished, after which the web is wound on the reel-up 30.
• the flow of information is schematically denoted by arrows, and data 22 from the control system of the paper machine are passed to monitoring data 42, to which also data from the monitoring units 61, 51, 11 and from the reel-up are passed, and the operation of the intermediate calender 60, the coating machine 50, the calender 10 and the reel-up 30 is controlled by means of feed-back 43.
• a paper or board web can be continuously manufactured at desired speed on the paper machine 15, and the machine need not be stopped because of a fault that occurs in a finishing device, for example, in the intermediate calender 60 or in the coating machine 50 or in the calender 10, but, instead, the web that is being produced can be stored and treated at a later stage with said finishing device 60,
• any finishing device can be bypassed and a reel-up can be situated between any two of the devices.
• a web W is passed from a dryer section 20 of a paper or board machine via a guide roll 13 to a calender 10 and, after that, via a guide roll 33 to a reel-up 30, on which the paper web is wound into a machine reel Rj .
• the reeling drum of the reel-up 30 is denoted by the reference numeral 31.
• Finished machine reels R ⁇ have been transferred onto storage rails 40 to await further processing.
• the guide rolls of the web W which are not used in normal running are denoted by the reference numerals 43A, 43B.
• the web W is conducted from the dryer section 20 via guide rolls 13, 43 A, 33 past the calender 10 to the reel-up 30, on which it is wound into machine reels R], R ⁇ ; which are transferred to a storage 40 or to another calender (not shown) to await finishing.
• a machine reel/reels R j containing unfinished web, situated in the storage 40, is/are unwound by means of an unwind station 70, and the web W is passed to the calender 10 by means of guide rolls 43B, 43A, 13 in order to be calendered and therefrom further via the guide roll 33 in order to be wound.
• Other possible positions of an unwind station 70', 70" are denoted by broken lines in the figure.
• Figs. 2A to 2C Corresponding parts in Figs. 2A to 2C are denoted by identical reference numerals, and the running direction of the web W is denoted by arrows S.
• the embodiment example of the invention shown in Figs. 2A to 2C is highly schematic and the finishing devices may, in addition to the calender 10 shown in the figures, comprise many other types of calenders and, in addition, different types of coating machines or other finishing devices.
• transfer of the web W can also be accomplished above the finishing device/finishing devices or by running the web through the finishing devices with the finishing stations open. Both the unwind and the windup stations can be situated at suitable locations in connection with the finishing devices, above or below or between/after the finishing devices.
• the reel-up 30 proper may also serve as an unwind station.
• the storage may also be located somewhere else instead of the position shown in the figures.
• the unfinished machine reels RN are moved, when needed, for example, with a hall crane (not shown) or by other suitable means to an unwind station.

Landscapes

• Paper (AREA)
• Advancing Webs (AREA)
• Replacement Of Web Rolls (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=8557735

Family Applications (1)

Country Status (9)

Families Citing this family (7)

Family Cites Families (3)

• 2000
  • 2000-02-25 FI FI20000441A patent/FI107554B/fi not_active IP Right Cessation
• 2001
  • 2001-02-21 CA CA002401225A patent/CA2401225A1/en not_active Abandoned
  • 2001-02-21 JP JP2001561848A patent/JP2003523908A/ja not_active Withdrawn
  • 2001-02-21 AT AT01911795T patent/ATE277227T1/de not_active IP Right Cessation
  • 2001-02-21 EP EP01911795A patent/EP1285126B1/de not_active Revoked
  • 2001-02-21 AU AU2001240726A patent/AU2001240726A1/en not_active Abandoned
  • 2001-02-21 US US10/204,528 patent/US20030136536A1/en not_active Abandoned
  • 2001-02-21 DE DE60105804T patent/DE60105804T2/de not_active Expired - Fee Related
  • 2001-02-21 WO PCT/FI2001/000176 patent/WO2001063046A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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