EP1790442A1 - Method and roll-cutting device for the slitting of a running web - Google Patents

Abstract

The method involves producing a longitudinal cut in a position (P1) in a continuous material web (3) by a slitting device, and transferring and continuing the production of the cut in the position by another slitting device before changing the cut in the position to another position (P2) of the web during the production of the continuous longitudinal cut. The former slitting device is carried to the latter position, and a new longitudinal cut is produced in the web in the latter position. The latter slitting device producing the continuous cut in the former position is set in contact. An independent claim is also included for a roll cutting machine with a set of slitting devices for cutting a continuous material web.

Description

The invention relates to a method for longitudinal cutting of a running material web, in particular a paper or board web, by means of at least one longitudinal cutting device which generates a longitudinal section in a first position in the moving web of material.

Furthermore, the invention relates to a slitter-winder with at least one longitudinal cutting device for cutting a moving material web, in particular a paper or board web, in a first position, wherein the preferably controllable / longitudinal slitting device comprises a pair of knives, which in the material web during cutting abstützendes knife and which comprises a knife immersed in the material web, and wherein both knives are arranged on at least one carriage, which is adjustably mounted on a transverse to the direction of the material web extending knife traverse and which has a knife holder for supporting the associated knife.

Such a slitter is known for example from the publication "BiWind ^™ Winding Systems - Winders for Total Roll Structure Control" Beloit Corporation. The illustrated unit has at least one longitudinal cutting device; as for example from the German Utility Model DE 298 12 753 U1 is known.

The known slitters having a plurality of longitudinal cutting devices produce individual narrower winding rolls from a wide material web and individual sheets by additional cross cutting. In order to be able to produce various sheet or wound roll formats, individual pairs of circular knives can be positioned transversely to the running direction of the material web.

In a known manner, the pairs of knives in an embodiment of circular knives each consist of a the knife during the cutting supporting pot knife and a dipping into the track tip knife whose cutting edges must be positioned exactly to each other in the desired cutting position. Usually, the pot knife used as a lower blade is driven, while the tip blade is freely rotatably mounted as a top blade. This is for example in the German patent DE 34 19 843 C2 described.

In order to be able to perform at least one format change in the material web, also referred to as a pattern change, the roll cutting machine must be turned off. At the same time standing web of material then at least one pair of knives is moved out of the web, positioned by means of at least one adjusting device at the new cutting position and then retracted again into the web. Now, the slitter rewinder can be put into operation again.

This currently practiced method for a pattern or format change unfortunately provides the great disadvantage that on the one hand, the slitter must be turned off and on the other hand, a large amount of time is required for the said change.

The invention is therefore based on the object of developing a method and a slitter-winder of the aforementioned types in such a way that a pattern change or format change can be carried out both when the slitter-winder is running and with a significantly reduced time requirement.

This object according to the invention is achieved in the method mentioned at the outset by adopting and continuing the generation of the previous longitudinal section in the first position by a further longitudinal cutting device when generating a continuous longitudinal section before changing the longitudinal section from the first position to a second position then the first longitudinal cutting device is brought from the first position to the second position and then generates a new longitudinal section in the second position in the moving web, and that subsequently, the further, the continued longitudinal section in the first position generating longitudinal cutting device is disengaged.

The object of the invention is completely solved in this way.

The method according to the invention makes it possible to carry out a pattern or format change while the slitter-winder is running. This results, inter alia, in a significantly reduced time required for the change with only small additional costs for the further slitting device, which is put into operation exclusively for the change process.

In a first preferred embodiment, it is provided that the running material web is severed transversely to its direction of movement after disengagement of the further longitudinal cutting device in an overlapping region comprising the two longitudinal sections. As a result, the new patterns or formats are quickly and cleanly separated from the old patterns or formats, all of which do not create any so-called "bridges".

The first longitudinal cutting device may be at least temporarily disengaged during the change from the first position to the second position, it may even be continuously disengaged, or it may also remain in continuous engagement. All three options basically favor a fast and clean pattern or format change.

In terms of process technology, it is advantageous if the longitudinal section in the first position and the longitudinal section in the second position are generated by a first longitudinal cutting device having at least one circular knife, preferably two circular knives arranged as a pair of knives. By contrast, the continued longitudinal section in the first position is preferably generated by a second longitudinal cutting device designed as a laser beam or water jet device. The type of first longitudinal cutting device has already proven itself in the past in many applications, both in terms of cutting quality, durability and thus the cost. Since the further longitudinal cutting device has only a fraction of the operating time of the first longitudinal cutting device, it is well suited in dargestter execution for the task.

In a slitter cutting machine of the type mentioned, the object of the invention is achieved in that a further preferably controllable / longitudinal slitting device for temporary acquisition and continuation of the previously produced by the first longitudinal cutting longitudinal section in the first position is provided and that preferably a tax / adjustable adjusting device for bringing the first longitudinal cutting device is provided from the first position to a second position.

The object of the invention is completely solved in this way and it results in the aforementioned advantages of the invention.

The further longitudinal cutting device may be arranged upstream of the first longitudinal cutting device in the first position counter to the running direction of the material web or may be arranged downstream of it in the first direction in the direction of travel of the material web. Both options produce a continuous longitudinal section in the first position.

Under process-technological aspects, it is again advantageous if the further longitudinal cutting device comprises a preferably controllable laser beam or water jet device.

Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

Figur 1

eine schematische und ausschnittsweise Seitenansicht einer erfindungsgemäßen Rollenschneidmaschine;

Figur 2

eine Draufsicht auf eine Materialbahn im Bereich der erfindungsgemäßen Rollenschneidmaschine bei einer ersten Ausführungsform eines Schnittmuster- beziehungsweise Formatwechsels; und

Figur 3

eine Draufsicht auf eine Materialbahn im Bereich der erfindungsgemäßen Rollenschneidmaschine bei einer zweiten Ausführungsform eines Schnittmuster- beziehungsweise Formatwechsels.

Show it

FIG. 1

a schematic and partial side view of a slitter according to the invention;

FIG. 2

a plan view of a material web in the region of the roll cutting machine according to the invention in a first embodiment of a pattern or format change; and

FIG. 3

a plan view of a material web in the region of the roll cutting machine according to the invention in a second embodiment of a pattern or format change.

The slitter-cutting machine 1 shown in partial detail in FIG. 1 in its side view comprises a longitudinal cutting device 2 for the purpose of FIG Cutting a moving material web 3, in particular a paper or board web, in a first position P1. In this case, a first longitudinal section A is generated.

The longitudinal cutting device 2 in this case has a pair of knives 4, which comprises a knife 5 (lower knife) supporting the material web 3 during cutting and a knife 6 (upper knife) dipping into the material web 3. The cutting edges of the two blades 5, 6 must be positioned exactly to each other in the desired cutting position. Preferably, as a lower blade 5 driven pot knife and as a top blade 6 disc-shaped and freely rotatable pointed blades are used, as for example in the already mentioned German patent DE 34 19 843 C2 are described.

The two knives 5, 6 are arranged in each case on a slide 7, 8, which are mounted adjustably on a respective knife cross-piece 9, 10 extending transversely to the direction of travel L (arrow; WTD = Web Travel Direction) and each of which has a knife holder 11, 12 for storage and preferred movement of the associated blade 5, 6 have. Each knife 5, 6 can be positioned transversely to the direction of travel L (arrow) of the material web 3 to be divided in order to set the required format width. In addition, each upper blade 6 in the direction of its axis of rotation against the associated lower blade 5 can be adjusted so that the two cutting edges can be aligned exactly relative to each other. In an unillustrated embodiment, the blades 5, 6 may of course be mounted on a common carriage.

There is now provided a further preferably controllable longitudinal cutting device 13 for temporary acquisition and continuation of the longitudinal section A previously generated by the first longitudinal cutting device 2 in the first position P1. The further longitudinal cutting device 13 is arranged upstream of the first longitudinal cutting device 2 in the first position P1 opposite to the running direction L (arrow) of the material web 3, and it preferably comprises one controllable laser beam or water jet device 14. The further longitudinal cutting device 13 may also be arranged downstream in a further, but not explicitly shown embodiment of the first longitudinal cutting device 2 in the first position P1 in the running direction of the material web. The design and operation of such a preferably controllable laser beam or water jet device 14 is well known to the skilled person and therefore requires no further explanation. It is moreover arranged on a carriage 15, which is displaceably mounted on a traverse 16 which extends transversely to the running direction L (arrow) of the material web 3, that is to say is mounted in a positionable manner. Thus, the further longitudinal cutting device 13 can be brought to the position P1 of the first longitudinal cutting device 2.

Furthermore, the slitter 1 comprises a preferably controllable adjusting device 17 for bringing the first longitudinal cutting device 2 from the first position P1 to a second position (FIGS. 2, 3). The controllable adjusting device 17 may, for example, comprise two electric servomotors 18, which support the carriages 7, 8 on which the two knives 5, 6 are respectively movably mounted via the respective knife holders 11, 12, respectively, from the position P1 in FIG Position P2 (Figures 2, 3) bring, in particular move.

The movement-causing components, such as the knife holder 11, 12 of the invention moving longitudinal cutting device, the adjusting device 17 for the knife holder 11, 12 and the further longitudinal cutting device 13 are depending on the process sequence according to the invention in the art known manner with a merely schematically indicated control / Control unit 19 connected, which takes over the control / regulation of the method for longitudinal cutting of a running material web 3, in particular a paper or board web. The control unit 19 can in turn be connected to a higher-level process control system (PLS).

The slitter 1 may have both a reel and two reeling. A reel-cutting machine 1 with two reels, which is also referred to in professional circles as a tandem reel-cutting machine, is known for example from the two international patent applications WO 99/61360 A1 (Backup roller scooter) and WO 00/43308 A2 (Double carrier roller) known.

FIG. 2 shows a plan view of a material web 3 with a running direction L (arrow) in the region of the slitter-winder 1 in a first embodiment of a pattern change or format change.

By way of example, the slitter-winder 1 comprises five slitters 2.1, 2.2, 2.3, 2.4, 2.5, which are shown schematically in front of the pattern-changing or format change, and thereby produce four individual slips I, II, III, IV in the running material web 3. The individual webs I, II, III, IV shown have a respective width B _I , B _II , B _III , B _IV . The two edge-side longitudinal cutting devices 2.1, 2.5 inevitably ever produce an edge strip R1, R2. They are moved so that the respective tapered section is located on the wider winding. The purpose of this exercise is to avoid protruding "noses". The "old" right single track is missing on the right edge then namely a small rectangular corner, while the "new" right single track on the left begins with a corresponding rectangular "flaw".

In the embodiment of FIG. 2, a pattern or format change of the shape is now provided such that after its termination only three individual webs V, VI, VII having a respective width B _V , B _VI , B _{VII are} produced. For this purpose, the longitudinal cutting device 2.4 is disengaged and the two edge-side longitudinal cutting devices 2.1, 2.5 are engaged in each case a small way to the left.

At the longitudinal section A generating longitudinal cutting device 2.3 is in As part of the pattern or format change, the inventive method for longitudinal cutting of a moving material web 3, in particular a paper or board web, by means of at least one longitudinal cutting device 2.3, which generates a longitudinal section A in a first position P1 in the running web 3, brought to application. Of course, the method according to the invention for longitudinal cutting of a moving material web 3 can also be carried out simultaneously at further longitudinal cutting devices.

It is provided that prior to a change of the longitudinal section A from the first position P1 to a second position P2 (longitudinal section B), the generation of the previous longitudinal section A in the first position P1 is taken over by a further longitudinal cutting device 13 when generating a continuous longitudinal section A1 and continued becomes. Subsequently, the first longitudinal cutting device 2.3 is brought from the first position P1 to the second position P2 (arrow) and then generates in the running material web 3, a new longitudinal section B in the second position P2. Subsequently, the further, the continued longitudinal section A1 in the first position P1 generating longitudinal cutting device 13 is disengaged.

In the embodiment of FIG. 2, the first longitudinal cutting device 2.3 remains engaged during its change from the first position P1 to the second position P2.

In general, the moving material web 3 is severed by disengaging the further longitudinal cutting device 13 in an overlapping region C encompassing the two longitudinal sections A1, B transversely to its running direction L (arrow). It should also be noted that also the longitudinal cutting device 2.4 is generally disengaged in the overlapping region C.

The longitudinal section A in the first position P1 and the longitudinal section B in the second position P2 is produced by a first longitudinal cutting device 2.3 having two circular knives arranged as a pair of knives. On the other hand, the continued longitudinal section A1 in the first position P1 is generated by a second longitudinal cutting device 13 designed as a laser beam or water jet device.

FIG. 3 shows a top view of a material web 3 in the region of the slitter-winder 1 in a second embodiment of a pattern change or format change.

This pattern or format change generally corresponds to the change method shown in FIG. 2, so that reference is made to this. Only the longitudinal cutting device 2.3 is continuously disengaged during its change from the first position P1 (longitudinal section A) to the second position P2 (longitudinal section B). In principle, only temporarily can be disengaged, as indicated by dashed lines. The continuous longitudinal section A1 produced by the further longitudinal cutting device 13 is shown in dashed lines.

The two longitudinal sections A1, B are in turn encompassed by the overlapping region C.

In summary, it should be noted that a method and a slitter rewinder of the aforementioned types are developed such that a Schnittmuster- or format change can be performed both while the slitter rewinding machine and with significantly reduced time required by the invention.

LIST OF REFERENCE NUMBERS

1

Winder

2

Slitter

2.1, 2.2, 2.3, 2.4, 2.5

Slitter

3

web

4

pair of blades

5

Knife (lower knife)

6

Knife (upper knife)

7, 8

carriage

9, 10

knife Traverse

11, 12

knife holder

13

Further longitudinal cutting device

14

Laser beam or water jet device

15

carriage

16

traverse

17

setting device

18

servomotor

19

Control / regulation unit

A

First longitudinal section

A1

Continued longitudinal section

B

longitudinal section

B _I , B _II , B _III , B _IV , B _V, B _VI , B _VII

width

C

overlap area

I, II, III, IV, V, VI, VII

single track

L

Running direction (arrow)

P1

First position

P2

Second position

R1, R2

edge strips

Claims (11)

Method for longitudinal cutting of a running material web (3), in particular a paper or board web, by means of at least one longitudinal cutting device (2; 2.1, 2.2, 2.3, 2.4, 2.5), which in the moving web (3) has a longitudinal section (A) in one generated first position (P1),
characterized,
in that prior to a change of the longitudinal section (A, B) from the first position (P1) to a second position (P2), the generation of the previous longitudinal section (A) in the first position (P1) by a further longitudinal cutting device (13) generates a continued longitudinal section (A1) and continue,
in that subsequently the first longitudinal cutting device (2, 2.3) is brought from the first position (P1) into the second position (P2) and then generates a new longitudinal section (B) in the second position (P2) in the moving material web (3), and
that following, the further, the continued longitudinal section (A1) in the first position (P1) generating longitudinal cutting device (13) is disengaged. Method according to claim 1,
characterized,
in that the running material web (3) is severed transversely to its running direction (L) in an overlapping region (C) comprising the two longitudinal cuts (A1, B) after the further longitudinal cutting device (13) has been disengaged. Method according to claim 1 or 2,
characterized,
that the first longitudinal cutting device (2, 2.3) is at least temporarily disengaged during its change from the first position (P1) to the second position (P2). Method according to claim 3,
characterized,
in that the first longitudinal cutting device (2, 2.3) is continually disengaged during its change from the first position (P1) to the second position (P2). Method according to claim 1 or 2,
characterized,
that the first longitudinal cutting device (2; 2.3) during their advancement from the first position (P1) to the second position (P2) continually remains engaged. Method according to one of the preceding claims,
characterized,
in that the longitudinal section (A) in the first position (P1) and the longitudinal section (B) in the second position (P2) are provided by a first longitudinal cutting device ((6)) comprising at least one circular knife, preferably two circular knives (5, 6). 2, 2.3) is generated. Method according to one of the preceding claims,
characterized,
that the continued longitudinal section (A1) formed in the first position (P1) by a laser beam or a water jet device (14) second longitudinal cutting device (13) is generated. Slitter (1) comprising at least one longitudinal cutting device (2; 2.1, 2.2, 2.3, 2.4, 2.5) for cutting a moving material web (3), in particular a paper or board web, in a first position (P1), the preferably taxing / controllable longitudinal cutting device (2; 2.1, 2.2, 2.3, 2.4, 2.5) has a knife pair (4) which has a knife (5) supporting the material web (3) during cutting and a knife (5) dipping into the material web (3). 6), and wherein both knives (5, 6) are arranged on at least one carriage (7, 8) which is adjustably mounted on a knife cross-piece (9, 10) extending transversely to the running direction (L) of the material web (3) and having a blade holder (11, 12) for supporting the associated blade (5, 6),
characterized,
in that a further preferably controllable longitudinal cutting device (13) is provided in the first position (P1) for temporary acceptance and continuation of the longitudinal cut (A) previously produced by the first longitudinal cutting device (2;
in that a preferably controllable adjusting device (17) is provided for bringing the first longitudinal cutting device (2, 2.3) from the first position (P1) into a second position (P2). Slitter (1) according to claim 8,
characterized,
that the further longitudinal cutting device (13) of the first longitudinal cutting device (2, 2.3) in the first position (P1) opposite to the running direction (L) of the material web (3) is arranged upstream. Slitter (1) according to claim 8,
characterized,
that the further longitudinal cutting device (13) of the first longitudinal cutting device (2, 2.3) in the first position (P1) in the running direction (L) of the material web (3) is arranged downstream. Slitter (1) according to claim 8, 9 or 10,
characterized,
that the further longitudinal cutting device (13) comprises a preferably controllable / adjustable laser beam or water jet device (14).

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