FI102093B - The finishing process unit for the web in a paper machine - Google Patents

Abstract

The invention concerns a web finishing section in a paper machine, which finishing section comprises at least a dryer section composed of one or several dryer groups (RN), a calender (20), and a reel-up (30). The calender (20) is placed at least partly underneath the reel spool storage space (33) of the reel-up (30) so that the reel-up (30) is placed substantially directly after the calender (20), in which case the web is passed directly from the calendering nip onto the reel cylinder or to a substantially short distance from the calender (20), the web being passed over one guide member that supports and/or spreads the web onto the reel cylinder.

Description

102093

The invention relates to a web finishing section in a paper machine comprising a drying section, a calender and a winder formed of at least one or more drying groups.

In known applications, the finishing parts of paper machines have long, substantially free 1. unsupported exports from both the calender before and 10 from the calender to the winder on the web, which substantially increases the length of the finishing part of the paper machine and requires head tension ropes. In addition, various quality indicators have been placed on these exports to measure and monitor the quality of the paper web. Naturally, the costs have also been caused by the paper guide rollers required for exports. Thus, long exports of the paper web 15 have also required head tension ropes and associated equipment and other arrangements for transporting the edge strip of the paper web from one step to another during head tapping, which has further increased hardware costs.

It is an object of the invention to provide a finishing section of a paper machine in which the problems described above are eliminated or at least minimized.

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It is also an object of the invention to provide a finishing section of a paper machine in which the length of the finishing section can be shortened compared to current solutions.

In order to achieve the above and later objects, the finishing part of the paper machine according to the invention is mainly characterized in that the calender „is placed at least partially below the spool stock of the winder so that the winder is positioned substantially immediately after the calender, in which case the web is passed directly from the calendering nip to the winding cylinder, or at a substantially short distance from the calender, in which the web is passed from a single web supporting and / or spreading web. through the control element »· '·; · 'For the rolling cylinder.

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The ice arrangement according to the invention enables rope-free head export, because there are no innumerable long exports, in which case, for example, guide plates and / or the like suitable for full-width export of the web can be used for head export. For example, in an application where the calender is a belt calender and a reel belt reel, the rope-free head can be arranged particularly simply so that the web from the last drying cylinder of the drying section is conveyed directly to the belt calender belt by means of guide plates or the like. One belt calender is disclosed in the applicant's FI application 931021 and one application as a belt reel is disclosed in the applicant's FI application 935669.

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With regard to the arrangement according to the invention, it is possible that various quality meters are known per se, the size of which is considerably smaller than before, so that it is simple to place them in connection with a calender, in particular a soft calender and / or a winder, without a separate support structure.

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The arrangement according to the invention achieves considerable length savings in the finishing section, which corresponds, for example, to the distance that can accommodate a group of six drying cylinders, whereby the capacity of the drying section can be increased without changing the overall length of the machine. With the same total length, production can be increased by 20, for example, from 615 tonnes to 735 tonnes per day or the speed from 1500 m / min to 1800 m / min, corresponding to an increase in production of about 16%. Of course, thanks to the invention * · / .. 'it is also possible to build a shorter, compared to the prior art, machine with the same capacity. I ’* la, which saves, for example, on the construction costs of a paper machine hall, which • · •« · * ... in itself constitute a large cost item, since the cost of a paper machine hall per meter • · · 25 is about FIM 1 million.

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The arrangement according to the invention also makes it possible to upgrade the efficiency of old machines, which have not previously been possible due to lack of space.

In the arrangement according to the invention, the short path exports after the calender make it possible to: coanda phenomenon-based full-width track export, because unnecessarily long distances • · «3 102093 difficult to control only fluidization-based web support and guidance can be reduced to a minimum.

In the ice arrangement according to the invention, paper guide rolls (approx. 2 pieces) are also saved, and only one pulper is needed, because a common pulper can be used for the drying section and the winder as the distance between them is shortened.

If cooling of the web is required between the calender and the winder, various cooling devices known per se, e.g. a blow box, can be used.

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The advantages of the invention are particularly evident when combining a soft calender and an applicant

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a reel marketed under the trademark Optireel, which is described in more detail in, for example, the applicant's FI application 905284 (corresponding to U.S. Patent 5,251,835).

In the following, the invention will be described in more detail with reference to the figures of the accompanying drawing, the details of which, however, are not intended to be limited in any way.

Fig. 1A schematically shows an arrangement known from the prior art, in which the last group of the drying section is a drying group applying a two-wire export.

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Fig. 1B schematically shows the finishing part according to Fig. 1A, followed in accordance with the invention.

Fig. 2A schematically shows an arrangement known in the prior art as a finishing section of a paper machine, in which the last group of the drying section is arranged to apply a single wire export and ..! Fig. 2B schematically shows the finishing section of the paper machine according to Fig. 2A, in which the arrangement according to the invention is implemented.

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In the following figures, corresponding parts are denoted by corresponding reference numerals and the letter A denotes arrangements known from the prior art.

In the prior art arrangement according to Fig. 1A, the last drying group RA 1 of the drying section 5 of the finishing section 5 applies a two-wire export, after which the web is passed as an export 26A to a soft calender 20A, followed by a second export 25A supported by paper guide rolls 27A. The pulpers 41A and 42A of the drying section and the winder are located below the machine level in the so-called basement space.

In the two-wire export of the drying group RAjsj, the wires 10A, 11A pass under the guide rollers 16A, 17A through the drying cylinders 12A.13A and the reversing rollers 14A, 15A according to the two-wire export. Between the drying cylinder rows 12A, 13A, the web has free tensions. From the drying group RA1, the paper web is passed via a guide roll 28A as an export 26A to the first calender nip NAj of the calender 20A, from where the web is further passed to a second calendering nip NA2. 32A and already finished machine roll with reference 35A.

• · ·. ··: 20 According to Fig. IB, the length of the finishing section of the paper machine has been shortened so that '; · 'Exports 26A.25A between the last drying group and the soft calender 20 and the soft calender Y / 20 and the winder 30 have been significantly reduced. The spool storage of the winder 30 • · [*** 33 is located above the soft calender 20 and the pulpers of the drying section and the winder are • «• · · * ... combined into one pulper 41. In the transport group R ^ the drying wires are marked 25 with reference numeral 10,11 and are passing under guide rollers 16,17 through drying cylinders 12,13 and pivot rollers 14,15. Between the drying cylinder rows 12,13 the web has • · · free tensions. From the last drying cylinder, the web is passed as a short export via a roll 28 1 «1 to the first calender nip Nj of the calender 20, from where it is led to the second calender nip N? Through the roll 37, a quality roll 29 is passed past the web winding cylinder 30 to a roll of paper 32 to be wound. The spool stock of the spool 30 is indicated by reference numeral 33, the spool changer by reference 34 and the finished machine roll by reference 35.

According to Figures 1A to 1B, in the arrangement according to the invention, a length saving is achieved. By way of example, in one application, the length saving Lj when moving from the arrangement according to Fig. 1A to the arrangement according to Fig. 1B is 7650 mm.

Fig. 2A schematically shows an arrangement known from the prior art as a finishing section of a paper machine 10, in which the last drying group RA 1 of the drying section is a drying group applying single wire export. The pulper 41A of the last drying group RAj is located

cellar space. From the last drying group, the paper web is derived as export 26A

to a soft calender 20A, where it is calendered on both sides in calendering nips NA1, NA2, after which the web is fed to a winder 30A, where it is formed into 15 machine rolls 32A, 35A. In the drying group of the drying section, the drying wire RA is marked

with reference number 50A, wire guide rollers with reference 5IA, drying cylinders with reference 52A

and bottom row vac rolls at 53A. The paper web to be dried passes in a single wire outlet from the drying cylinders 52A to the turntable rollers 53A at all times, supported by the drying wire 50A.

Thereafter, the web advance corresponds to the arrangement shown in Fig. 1A. Figure 2A

·; ·; In the embodiment according to Fig. 20, a quality measuring device 29A is arranged between the calender 20A and the winder 30A.

In the schematic embodiment shown in Fig. 2B, the finishing section of the paper machine is shortened according to the invention, whereby the export 26 from the drying section to the soft calender 20 is slightly shortened and the export is slightly shortened. from the calender 20 to the winder 30 is completely removed when the spool storage 33 of the winder 30 is placed above the soft calender 20, whereby a considerable space saving has been achieved. The drying group is applied to single-wire export ,, '. a drying group in which the paper web passes, supported by a drying wire 50, a top row drying cycle. ·, From the liners 52 to the vac rollers 53 located in the bottom row. The wire guide rollers of the wire 50 are marked

• 30 by reference numeral 51. The export of the remainder of the finishing section corresponds substantially to that shown in Fig. 1B above

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:: described in connection.

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When switching from the arrangement according to Fig. 2A to the arrangement according to Fig. 2B, the length saving L2 to be achieved is, for example, 6300 mm.

According to the invention, when shortening the finishing section, the upper roll of the 2nd nip N2 5 of the soft calender 20 can be lifted straight up from the machine through the tamping stock 33, which results in easy and fast roll change, i.e. the production efficiency of the machine increases. In the tampon storage 33, parts opening above the above-mentioned roll, e.g. links, etc., which enable the roll to be lifted through the body of the tampon storage 33. The body of the tampon storage 33 is supported from the floor level by its own pillars outside the body 10 of the soft calender 20 to prevent the adverse effects of vibrations of the soft calender 20. The frame is supported in the machine direction at both ends. The measures described above achieve easy rapid roll change with a soft calender 20, vibration-free storage 33 for spool rolls. The spread of the effect of possible dusting of the reel 30 on the calender 20 is prevented by constructing an air jet and / or a removable protective wall between the reels 30 of the calendar 20 and 15, if necessary (not shown). The quality measuring beam is built integrally between the pillars between the calender 20 and the winder 30, taking into account the vibration damping. Only one pulper 41 is required for the reel 30 and the calender 20, which is mounted so that a path can be run from the drying section R 1, the calender 20 and the reel 30 to the pulper. The orifices 45 of the pulper 41 are designed to be long enough and, if necessary, · ;;; The pulper 41 is built low enough to cause a landing. The body of the winding devices 30 is separated from the body of the spool storage 33 and the calender 20, thus avoiding

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• · · from vibrations and resonance of various components.

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Figures 1B and 2B show some preferred application examples of a web finishing section 25 according to the invention in a paper machine. This, of course, is not intended to limit j ·. the invention only applies to such finishing parts, but many other types of modifications are possible. For example, the drying groups can be cylindrical as shown in the figures. - instead of imaging groups, implement, for example, by applying the heat pipe phenomenon '···, drying concept (CONDEBELT), fluidized bed dryers, infrared based dryers, etc. Naturally, the roller and calender shown in the figures may also differ from the applications shown in the figures, e.g. other types of calenders may be used; machine calender, supercalender, etc.

The invention has been described above only with reference to some of its preferred application examples, the details of which, however, are not intended to be limited in any way. Many variations and modifications are possible within the scope of the inventive idea defined by the following claims.

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Claims (12)

102093 A web finishing section in a paper machine comprising a drying section, a calender (20) and a winder (30) formed by at least one or more drying groups (R 2), characterized in that the calender (20) is arranged at least partially in the spool storage (33) of the winder (30). ) so that the winder (30) is positioned substantially immediately after the calender (20), whereby the web is passed directly from the calendering nip to the winding cylinder, or substantially a short distance from the calender (20), whereby the web is passed through a single web supporting and / or spreading guide. 10 rille. Finishing section according to claim 1, characterized in that the calender (20) is arranged substantially immediately after the last drying group (R 1) of the drying section, the web being led directly from the calendering nip to the winding cylinder, or at a substantially short distance from the last drying group (R 1), the web is passed through a single web supporting and / or spreading guide member to the winding cylinder. Finishing section according to Claim 1 or 2, characterized in that the last drying group (R 1) of the drying section is a drying group *: 20 (Fig. Ib) which applies a two-wire export. Finishing section according to Claim 1 or 2, characterized in that the last drying group (R 1) of the drying section is a drying group which applies a single-wire export (FIG. 2B). 25 Finishing section according to Claim 1 or 2, characterized in that: ':': the last drying group of the drying section is a drying group based on the heat pipe effect. m 9 I · «I t (···. Finishing part according to Claim 1 or 2, characterized in that the last drying group of the drying part I« .. 30 is a drying group based on fluidized bed dryers. • «·« 1 · • · 102093 Finishing according to Claim 1 or 2, characterized in that the last drying group of the drying section is a drying group based on infrared radiation drying. Finishing part according to one of Claims 1 to 7, characterized in that the calender is a soft calender (20). Finishing part according to one of Claims 1 to 7, characterized in that the calender is a machine calender. 10 Finishing part according to one of Claims 1 to 7, characterized in that the calender is a supercalender. Finishing part according to one of Claims 1 to 10, characterized in that the latter calendering nip (N2) of the calender (20) is arranged entirely below the spool storage (33) of the winder (30). Finishing part according to one of Claims 1 to 11, characterized in that the drying part, the calender (20) and the winder (30) of the finishing part have a common pulper · ::: '20 (4i). 1 «4 t» 4 «j 4 4 ··« • »* ·» · «t '' .. • ·· s:; * «· R .. • 1 1 • · ♦ • · ♦ f i 4 41« «» 4 · «« • t * 1 · 102093