WO1996011868A1

WO1996011868A1 - Method in reeling and change device for use in the method

Info

Publication number: WO1996011868A1
Application number: PCT/FI1995/000535
Authority: WO
Inventors: Esa Aalto; Markku Kyytsönen; Aaron Mannio
Original assignee: Valmet Corporation
Priority date: 1994-10-13
Filing date: 1995-09-29
Publication date: 1996-04-25

Abstract

The invention concerns a method in reeling and a change device for use in the method. In the method, the web (P) is reeled onto a reel spool (12) by the intermediate of a reeling cylinder (11) through a nip (N). The reel spool (12) that is being filled, i.e. the machine reel (13), is transferred to a change position, the web (P) is cut off, and reeling is continued onto a new, empty reel spool (12a). A web pressing member (20) is guided in the vicinity of the reeling nip (N) onto the web (P), and the web (P) is pressed by means of the web pressing member (20), the web (P) moving along a curved path of movement (D) from the reeling nip (N) onto the reel spool (12) that is being filled. The web (P) is cut off as of full width. The end of the web (P) that has been cut off as of full width is reeled around the new, empty reel spool (12a) by means of the guiding effect of the web pressing member (20).

Description

Method in reeling and change device for use in the method

The invention concerns a method in reeling, wherein the web is reeled onto a reel spool by the intermediate of a reeling cylinder through a nip, and in which method the reel spool that is being filled, i.e. the machine reel, is transferred to a change position, the web is cut off, and reeling is continued onto a new, empty reel spool.

Further, the invention concerns a change device for use in the method in accordance with the invention.

From the prior art, a reeling arrangement is commonly known in which the web is wound onto a reel spool by the intermediate of a reeling cylinder through a nip. The reel spool is mounted on reeling rails, and the reel spool is provided with a centre drive and with a reel-spool shifting device. Further, the reeling arrangement comprises devices for initial reeling, in which there is an empty reel spool for the start of new reeling. The reel spool that is being filled, i.e. the machine reel, is transferred to the change position, and the web is cut off, and reeling is continued onto the new, i.e. empty reel spool.

In the reel change in connection with reeling, as a rule, a difficulty is encountered above all in, after the cutting-off of the web, guiding the web end to around the new reel spool.

In the FI Patent No. 74, 679, a device is described for cutting off the web in a Pope- type reel-up by means of a tape, which is made to pass from one side of the reel-up to the other side and whose end is provided with a face that adheres to the reel spool, and which tape is fed between the reeling cylinder and the reel spool, whereby the end of the tape adheres to the reel spool and is wound freely around the reel spool and, at the same time, cuts the web owing to the tensioning of the tape. The new web is guided by means of the tape to around the new empty reel spool.

The operability of this prior-art solution is, however, not sufficiently good. Also, it is a drawback that the tape marks layers of the web, which deteriorates the quality of the machine reel. In this prior-art solution, the cutting-off takes place diagonally, whereby the cutting result is shaped as a wedge-shaped tip. Moreover, this prior-art solution is of relatively high cost.

The object of the present invention is to provide an improvement over the prior-art reeling methods. It is a more specific object of the invention to provide a reeling method in which the reel change in reeling does not cause problems. It is a further object of the invention to provide a reeling method that is in particular suitable for thick web grades, such as, for example, for board.

The objectives of the invention are achieved by means of a method, which is characterized in that a web pressing member is guided in the vicinity of the reeling nip onto the web, and the web is pressed by means of the web pressing member, the web moving along a curved path of movement from the reeling nip onto the reel spool that is being filled, that the web is cut off as of full width, and that the end of the web that has been cut off as of full width is reeled around the new, empty reel spool by means of the guiding effect of the web pressing member.

A preferred embodiment of the method in accordance with the invention is character- ized in that the old reel spool, i.e. the machine reel that is being filled, and the new, empty reel spool are brought to a change position, the web is cut off as of full width by means of a striking cutter blade, and that the cut-off end of the web is blown to around the new, empty reel spool by means of air blowing of full width.

The change device in accordance with the invention is characterized in that the change device is a web pressing member which is provided with a cutter blade. A preferred embodiment of the change device in accordance with the invention is characterized in that the change device consists of a striking blade device, which cuts off or weakens the web, and of a blower device, which forms the end of the cut-off web into a bag-shaped web portion and directs the tip of the bag-shaped web portion towards the nip between the new, empty reel spool and the reeling cylinder.

In the reeling method in accordance with the present invention, the reel change is carried out as follows. The web pressing member, which is provided with a cutter blade, is guided to the vicinity of the web before the reeling nip, and the web is pressed by means of the pressing member so that the web moves along a curved path of movement from the reeling nip onto the reel spool that is being filled. After this, the web is cut off by means of the cutter blade as of full width. The cut-off end of the web is reeled around the new reel spool owing to the guiding effect of the web pressing member. If necessary, it is possible to use blowing of air as an aid for guiding the web. The direction of movement of the cutter blade can be made favourably such that the web that has been cut off is guided onto the new reel spool. As the cutter device, it is preferable to use the web cutter device described in the Finnish Patent Application No. 944816.

In a preferred embodiment of the reeling method in accordance with the invention, the reel change is carried out as follows. The old reel spool, i.e. the machine reel that is being completed, and the new, empty reel spool are brought to the change position. The web is cut off by means of a cutter blade that strikes across the full width. The cut-off end of the web is blown around the new, empty reel spool by means of an air blowing of full width. Such a method is suitable for both thin and thick web grades.

In a second preferred embodiment of the reeling method in accordance with the invention, the reel change is carried out as follows. A strong web, such as a thick board web, is weakened, for example, by perforating the thick web by means of a blade device that strikes across the full width, which blade device does, however, not cut off the thick web. The old reel spool, i.e. the machine reel that is being completed, is slowed down, i.e. its speed of rotation is lowered. In such a case, in the change position, the thick web is cut off by the effect of the difference in speed and of the weakening or perforation that was made into the thick web and as a result of the fact that the directions of pulling applied to the web at opposite sides of the point of perforation are opposite. After the cutting off of the thick web, the cut-off end of the web is guided by means of air blowing of full width to around the new, empty reel spool.

In a second preferred embodiment of the invention, the change device consists of a striking blade device, which weakens a thick web, and of a blow device, which forms a bag-shaped web portion out of the end of the cut-off web and directs the tip of the bag-shaped web portion towards the nip between the new, empty reel spool and the reeling cylinder. The change device in accordance with the invention is also suitable for web grades of lower strength, which are not supposed to be cut off by means of the striking blade device but just to be weakened, i.e. perforated, by means of the striking blade device.

The method in accordance with the invention and the change device used in the method provide a number of significant advantages over the prior-art solutions. By means of the method in accordance with the invention and by means of the change device employed in the method, a cutting of full width is achieved, and the cutting result is straight. By means of the invention, detrimental marking of the web is avoided. The method of the present invention is of lower cost and higher reliability as compared with the prior-art methods. From the point of view of the method of the invention, it is not essential at what point the new, empty reel spool is brought into contact with the reeling cylinder.

The invention will be described in detail with reference to a preferred embodiment of the invention illustrated in the figures in the accompanying drawings, the inven- tion being, however, not supposed to be confined to said embodiment alone.

Figure 1 is a side view of a prior-art reeling arrangement. Figure 2 is a side view of a preferred embodiment of the method in accordance with the present invention.

Figure 3 is a side view of a preferred embodiment of the web cutter device used in the method in accordance with the invention.

Figure 4 is an axonometric view of a second preferred embodiment of the method in accordance with the present invention.

Figure 5 is an axonometric view of a third preferred embodiment of the method in accordance with the present invention.

Figures 6A,6B,6C and 6D are schematic side views illustrating different process steps in the method as shown in Fig. 5.

In Fig. 1, the reeling arrangement is denoted generally with the reference numeral 10. In this embodiment, the reeling arrangement 10 comprises a reeling cylinder 11, which revolves in the sense indicated by the arrow A, and the web P is reeled onto the second roll, i.e. the reel spool 12. The web P is reeled onto the reel spool 12 by the intermediate of the reeling cylinder 11 through the nip N. The reel spool 12 revolves in the sense indicated by the arrow B. The reel spool 12 is mounted on the reeling rails 14, and the reel spool 12 is provided with a centre drive 16 and with a reel-spool shifting device 17. The reference numeral 13 refers to the machine reel that is being formed, and the reference numeral 15 refers to the reeling carriage, with which the reel-spool shifting device 17 is connected operationally. Further, the reeling arrangement 10 comprises devices 18 for initial reeling. The reference numeral 12a refers to the empty reel spool, which revolves in the sense indicated by the arrow C. Such a reeling arrangement is conventional and does not represent any part of the invention proper as yet.

In Fig. 2, the reel spool 12 that is being filled, i.e. the almost complete machine reel 13, has been transferred to the change position. The change device used in the method of the invention is denoted generally with the reference numeral 20. In this embodiment, the change device 20 comprises a spreader bar 21, which is provided with a cutter blade 22. Thus, the change device 20 is a web pressing member, which is provided with a cutter blade 22. Further, the web pressing member 20 may comprise air blowings 23.

In the method in accordance with the invention, the web pressing member 20 is guided in the vicinity of the reeling nip N onto the web P, and the web P is pressed by means of the web pressing member 20, in which case the web P moves along a curved path of movement D from the reeling nip N onto the reel spool 12 that is being filled, the web P is cut off across its full width, and the end of the web P that has been cut off as of full width is reeled to around the new, empty reel spool 12a with the aid of the guiding effect of the web pressing member 20.

In a practical application, the spreader bar 21 is placed, for example, in a pulper chamber, from which it is raised to the position shown in Fig. 2. When the cutter blade 22 strikes, through the spreader bar 21 it is favourably possible to blow air as an air blowing 23, in which case the cut-off end, for example, of a board web P is turned reliably onto the new reel spool 12a. Also, the direction of movement of the cutter blade 22 can be made such that the end of the web P that is cut off is guided reliably to the new reel spool 12a.

The cutter device shown in Fig. 3, which is described in the FI Patent Application No. 944816, is denoted with the reference numeral 30. In this embodiment the frame part of the cutter device consists of a first frame part 31 , of a second frame part 32, and of a third frame part 33. The frame parts 31,32, and 33 are tubes fitted one inside the other, and to the innermost tube 31 a cutter blade 22 is attached so that the spring-like cutter blade 22 can be charged in the annular space 36 between the first tube 31 and the second tube 32. The blade holder of the cutter blade 22 is denoted with the reference numeral 35. The direction of running of the web P is denoted with the arrow E. The annular space between the second tube 32 and the third tube 33 is denoted with the reference numeral 38. Into the second tube 32 and the third tube 33, openings have been formed for the striking opening 37 for the cutter blade 22.

The cutter device 30 shown in Fig. 3 operates as follows. When the innermost tube 31 is displaced from the position shown in Fig. 3 anti-clockwise, the cutter blade 22, which is a spring-like cutter blade, is charged by being pressed against the face of the innermost tube 31. When the innermost tube 31 is displaced further in the same direction, the free end of the cutter blade 22 is released from underneath the edge of the second tube 32 and cuts off the web P. In Fig. 3, a stage is shown in which the cutter blade 22 has struck through the web P. After the cutting-off, pressurized air can be passed into the space 38 between the tubes 32 and 33, which air is discharged out of the striking opening 37 for the cutter blade 22 and removes any paper or board chips that may have been formed in the cutter device. The tubes 32 and 33 can be supported on each other by welding suitably spaced support rings between them.

By means of the cutter device 30, the striking force of the cutter blade 22 is produced by releasing the cutter blade 22 from its tensioned position. Since the striking force of the cutter blade 22 is obtained from the cutter blade 22 itself, the detrimental dynamic masses acting upon the cutting process remain minimal. During the time when the teeth of the cutter blade 22 are penetrating through the web P, the cutter blade 22 also passes some distance in the running direction E of the web P, so that the difference in speed between the web P and the cutter blade 22 in the running direction E of the web P at the time of cutting is considerably lower than in the case of many other, prior-art cutter devices. This reduces the detrimental tearing of the web in the running direction E of the web P. Moreover, the running direction E of the web P and the geometry of the cutter device 30 intensify the cutting process itself.

In the method in accordance with the invention, the cut-off end of the web is guided to around the new reel spool 12a primarily by means of the web pressing member, i.e. the spreader bar 21. The guiding of the cut-off end of the web P onto the new reel spool 12a can, if necessary, be intensified by means of air blowings 23. Further, the guiding of the cut-off end of the web can be intensified by, as the cutter blade 22, using a web cutter device as described in the FI Pat. Appl. No. 944816, which device permits to make the direction of movement of the cutter blade 22 such that the web that is cut off is guided reliably onto the new reel spool 12a.

In the embodiment shown in Fig. 4, the old reel spool 12, i.e. the machine reel 13 that is being completed, and the new, empty reel spool 12a are brought to the change position. The web P is cut off by means of a cutter blade 19 that strikes across the full width. The cut-off end of the web P is blown to around the new, empty reel spool 12a by means of air blowing 20 of full width. The method as shown in Fig. 4 is suitable for both thin and thick web grades.

In the embodiment as shown in Fig. 5 and in Figs. 6A...6D, the thick web P is weakened, for example, by perforation by means of a striking blade device 19 as of full width. After this, in the change position, the old reel spool 12, i.e. the machine reel 13 that is being completed, is slowed down, i.e. the speed of rotation of the machine reel 13 is lowered, in which case the thick web P is cut off at the perfor¬ ation point 21a by the effect of the difference in speed and of the weakening 21a. The cutting off of the thick web P is promoted by the fact that opposite directions of pulling are applied to the web P at opposite sides of the perforation point 21a. After this, by means of air blowings 20 of full width, the cut-off bag-shaped web portion of the web P is guided to around the new, empty reel spool 12a.

By means of the striking blade device 19, if necessary, it is possible to carry out a number of strokes so as to form a number of weakenings or perforations 21a placed at a distance from one another so as to facilitate the timing of the reel change.

The different process steps in the method as shown in Fig. 5 are illustrated in Figs. 6A...6D. In the process step shown in Fig. 6A, a weakening 21a has been formed into the web P. In the process step shown in Fig. 6B, the weakened web is blown into bag-shaped form, and the tip of the bag-shaped web portion P" is directed towards the nip N formed by the new, empty reel spool 12a and the reeling cylinder 11. In the process step shown in Fig. 6C, the weakening 21a is torn apart, and a gap 21b is formed into the web P. The other web portion P' follows the machine reel 13 that is being completed. In the process step shown in Fig. 6D, the reeling is continued around the new reel spool 12a.

The method in accordance with the invention and the change device used in the method of the invention are excellently well suitable for thick web grades, such as, for example, board. Of course, the solution in accordance with the invention can also be applied equally well to thinner web grades, such as, for example, to paper etc.

Above, just one preferred embodiment of the invention has been described, and it is obvious to a person skilled in the art that numerous modifications can be made to said embodiment within the scope of the inventive idea defined in the accompanying patent claims.

Claims

1. A method in reeling, wherein the web (P) is reeled onto a reel spool (12) by the intermediate of a reeling cylinder (11) through a nip (N), and in which method the reel spool (12) that is being filled, i.e. the machine reel (13), is transferred to a change position, the web (P) is cut off, and reeling is continued onto a new, empty reel spool (12a), characterized in that a web pressing member (20) is guided in the vicinity of the reeling nip (N) onto the web (P), and the web (P) is pressed by means of the web pressing member (20), the web (P) moving along a curved path of movement (D) from the reeling nip (N) onto the reel spool (12) that is being filled, that the web (P) is cut off as of full width, and that the end of the web (P) that has been cut off as of full width is reeled around the new, empty reel spool (12a) by means of the guiding effect of the web pressing member (20).

2. A method as claimed in claim 1 , characterized in that the guiding of the cut-off end of the web to around the new, empty reel spool (12a) is intensified by means of air blowing (23).

3. A method as claimed in claim 1 or 2, characterized in that the guiding of the cut-off end of the web to around the new, empty reel spool (12a) is intensified by means of the direction of movement of the cutter blade (22).

4. A change device for use in the method as claimed in any of the claims 1 to 3, characterized in that the change device (20) is a web pressing member which is provided with a cutter blade (22).

5. A change device as claimed in claim 4, characterized in that the web pressing member (20) is provided with air blowing (23).

6. A change device as claimed in claim 4 or 5, characterized in that the web pressing member (20) is a spreader bar (21).

7. A change device as claimed in any of the claims 4 to 6, characterized in that the first frame part (31) and the second frame part (32) of the frame part of the web (P) cutting device (30) are curved faces, between which there is an annular space (36), that at least one of said curved faces is displaceable, the cutter blade (22) being fitted to be charged in said annular space (36), and that, at least in one of the frame parts (32), there is an opening for the striking opening (37) for the cutter blade (22).

8. A change device as claimed in claim 7, characterized in that at least the first frame part (31) and the second frame part (32) are tubes.

9. A change device as claimed in claim 7 or 8, characterized in that the cutter blade (22) is attached to the first frame part (31).

10. A change device as claimed in any of d e claims 7 to 9, characterized in that the cutter blade (22) is a spring-like cutter blade.

11. A change device as claimed in any of the claims 7 to 10, characterized in that, between the second frame part (32) and the third frame part (33), there is an intermediate space (38) for passing air blowings through the intermediate space (38) into the striking opening (37) for the cutter blade (22).

12. A change device as claimed in any of the claims 7 to 11, characterized in that the striking opening (37) for the cutter blade (22) is formed by openings provided in the second frame part (32) and in the third frame part (33).

13. A change device as claimed in any of the claims 7 to 12, characterized in that the third frame part (33) is a tube.

14. A change device as claimed in any of the claims 7 to 13, characterized in that the direction of striking of the cutter blade (22) is fitted to act in the same direction as the running direction (E) of the web (P).

15. A method in reeling, wherein the web (P) is reeled onto a reel spool (12) by the intermediate of a reeling cylinder (11) through a nip (N), and in which method the reel spool (12) that is being filled, i.e. the machine reel (13), is transferred to a change position, the web (P) is cut off, and reeling is continued onto a new, empty reel spool (12a), characterized in that the old reel spool (12), i.e. the machine reel (13) that is being filled, and the new, empty reel spool (12a) are brought to a change position, the web (P) is cut off as of full width by means of a striking cutter blade (19), and that the cut-off end of the web (P) is blown to around the new, empty reel spool (12a) by means of air blowing (20) of full width.

16. A method in reeling, wherein the web (P) is reeled onto a reel spool (12) by the intermediate of a reeling cylinder (11) through a nip (N), and in which method the reel spool (12) that is being filled, i.e. the machine reel (13), is transferred to a change position, the web (P) is cut off, and reeling is continued onto a new, empty reel spool (12a), characterized in that the old reel spool (12), i.e. the machine reel (13) that is being filled, and the new, empty reel spool (12a) are brought to a change position, the web (P) is weakened by means of a striking blade device (19), in which connection a weakening or perforation (21a) of full width is formed into the web (P), the speed of rotation of the old reel spool (12), i.e. of the machine reel (13) that is being completed, is lowered, whereby, in the change position, the web (P) is cut off by the effect of the difference in speed and of the weakening or perforation (21a) that was made into the web (P), and that the cut-off end (P") of the web (P) is guided by means of an air blowing (20) of full width to around the new, empty reel spool (12a).

17. A method as claimed in claim 16, characterized in that, by means of the striking blade device (19), a number of strokes are performed so as to form a number of weakenings or perforations (21a) placed at a distance from one another in order to facilitate the timing of the reel change.

18. A change device for use in the method as claimed in any of the claims 15 to 17, characterized in that the change device consists of a striking blade device (19), which cuts off or weakens the web (P), and of a blower device (20), which forms the end of the cut-off web (P) into a bag-shaped web portion (P") and directs the tip of the bag-shaped web portion (P") towards the nip (N) between the new, empty reel spool (12a) and the reeling cylinder (11).