Method and Device for Successively Winding a Film Web, and Film Roll

Abstract

The invention relates to a method for successively winding a film web onto a plurality of spools, wherein the film web is wound to form a first spool, and a tube and/or winding shaft for forming a subsequent second spool and the film web are moved closer to one another and/or are brought into contact with one another upstream of the first spool. The film web is cut, and thus an end of the film web is produced, with end is wound onto the first spool, and a new start of the file web is produced, which is wound onto the second tube. In order to cut the film web, the film web is cut partially in the transverse direction, at least one cut edge and at least one uncut region remaining in the transverse direction, the uncut region being subsequently torn off or cut off.

Claims

1. A method for successively winding a film web onto a plurality of spools, wherein the film web is wound into a first spool, a tune and/or winding shaft for forming a subsequent second spool and the film web are moved closer to one another and/or brought into contact upstream of the first spool, a cutting of the film web is caused, wherein an end of the film web is produced which is wound onto the first spool and wherein a new start of the film web is produced which is wound onto the second tube, characterized in that for cutting the film web, the film web is partially cut in the transverse direction, leaving at least one cut edge and at least one uncut region in the transverse direction, wherein the uncut region is subsequently torn off or cut off.

2. The method according to claim 1, characterized in that, after partially cutting the film web and before tearing off or cutting off the at least one initially uncut region, the film web is further elongated in the uncut region.

3. The method according to claim 2, characterized in that the film web is elongated in the uncut region until at least a cut edge substantially rests on the first spool.

4. The method according to claim 1, characterized in that the first spool is driven until the uncut region is completely torn off or cut off.

5. The method according to claim 1, characterized in that a fixing force is provided with which the film web is fixed to the second tube and/or winding shaft to provide a counterforce for the tearing-off.

6. The method according to claim 1, characterized in that at least one blade is brought into contact with the film web for partially cutting the film web, wherein the blade has at least one cutting edge which includes interruptions.

7. The method according to claim tithe preceding claim, characterized in that at least two blades are provided for partially cutting the film web, the cutting edges of which blades are arranged parallel to one another and on different lines.

8. The method according to claim 1, characterized in that at least one beam including electrooptical waves, particularly a laser beam, is guided transversely to the film web for partially cutting the film web, wherein the beam is at least partially interrupted during such guiding.

9. A winding device for successively winding a film web onto a plurality of spools, having a first winding location at which the film web can be wound onto a first spool, a second winding location at which a winding tube and/or a winding shaft can be provided, a moving device with which the winding tube and/or the winding shaft and the film web can be moved closer to one another or brought into contact with one another upstream of the first spool, a cutting device, with which the film web can be cut, wherein an end of the film web can be produced which can be wound onto the first spool and wherein a new start of the film web can be produced which can be wound onto the winding tube and/or winding shaft, characterized in that the cutting device includes at least one cutting region in which at least one cut edge which has interruptions in the transverse direction of the film web can be produced in the transverse direction of the film web.

10. The device according to claim 9, characterized in that a control device is provided with which a drive with which the first spool can be rotationally driven can be activated, wherein the control device sends a control signal to the drive for ending the rotational driving after the film web has been torn or cut at the interruption of the cut edge.

11. The device according to claim 9, characterized in that at least one force supply element is provided with which the film web can be fixed to the winding tube and/or winding shaft, such that a counterforce for tearing off can be applied.

12. The device according to claim 9, characterized in that the cutting device includes at least one blade for insertion into the film web, wherein the blade includes at least one cutting edge with interruptions.

13. The device according to claim 9, characterized in that the cutting device includes at least two blades for insertion into the film web, the cutting edges of which are preferably arranged parallel to one another and on different lines.

14. The device according to claim 9, characterized in that the cutting device includes at least one beam comprising electrooptical waves, particularly a laser beam, which is guided transversely to the film web, wherein the beam is at least partially interruptible during such guiding.

15. A film roll with a wound-up film web, wherein the start of the film web is arranged radially inside and the end of the film web is arranged radially outside, characterized in that the end of the film web includes at least one region with at least one cut edge and at least one region which projects beyond the cut edge in the winding direction.

16. The film roll according to claim 15, characterized in that the region projecting beyond the cut edge has an elongation.

17. The film roll according to claim 15, characterized in that region projecting beyond the cut edge includes a tear-off edge, which particularly has a random edge contour.

Description

[0035] Other advantages, features, and details of the invention can be derived from the following description which explains various exemplary embodiments in detail with reference to the figures. The features mentioned in the claims and in the description can be essential to the invention, either alone or in any combination of features mentioned. Within the scope of the entire disclosure, features and details described in the context of the method according to the invention and/or with the film roll according to the invention, also apply in the context of the winding device according to the invention and/or with the film roll according to the invention and vice versa, such that these are or can be referenced alternately with respect to each aspect of the invention regarding the disclosure. Wherein:

[0036] FIG. 1 shows a side view of a schematic diagram of a winding device according to the invention

[0037] FIG. 2 is like FIG. 1, but with a new winding shaft provided

[0038] FIG. 3 is like FIG. 2, but a plan view thereof

[0039] FIG. 4 is like FIG. 3, but with the film web transported further onto the first spool.

[0040] FIG. 1 shows a schematic diagram of a winding device 1, showing just the components that are essential to the invention. First, the film web 2 is visible, which is conveyed along a transport path in the transport direction z. It is not shown that the film web can be transported via other rollers or rolls, such that the transport path is not necessarily linear. The film web 2 is wound onto a first spool 3 which rotates about a winding shaft 4 of the winding device 1 in the direction of rotation D to wind up the film web 2. The winding shaft 4 can carry a winding tube 5, which is part of the spool 3 inasmuch as it is pushed from the winding shaft 4 together with the wound-up film web after the spool 3 is completed. Alternatively, tubeless winding is possible, in which the film web is wound directly onto the winding shaft 4.

[0041] The winding shaft 4 is directly or indirectly connected to the machine frame of the winding device. The winding shaft 4 is often rotatably arranged on a component which can be moved relative to the machine frame. Such a component may for example be a carriage or a rotary plate, particularly in a so-called reversing winder. The new winding shaft 5, the function of which is described in more detail below, can be inserted into the carriage before or after the spool change at the position of the first winding shaft 4 or—in the case of a rotary plate—be mounted in the rotating disc as well. More winding shafts are conceivable, which may particularly be arranged in a rotary plate. It is also not shown that the winding shafts can be released from the rotary plates at least on one of their ends, while the other end preferably is still mounted in the rotary plate. Thus the finished spool, or the finished spools in the case of multi-spool winding, can easily be pulled from the respective winding shaft.

[0042] The new winding shaft 6 already carries a winding tube 7 and is already near the transport path of the film web 2. A cutting device which includes a blade 8 in the exemplary embodiment shown, is also arranged near the transport path of the film web 2 and in an inactive position in which it is kept on standby for cutting the film web 2. The blade 8 is arranged on a blade carrier 9. To move the blade relative to the film web 2 for performing the cut, the blade carrier preferably includes at least one lever arm 10 which can be rotated about an axis of rotation 11, such that the blade can be inserted in a swiveling manner in an active position into the transport path of the film web 2 to provide it with cuts. The lever arm 10 can for example be mounted via the axis of rotation 11 on the machine frame or on the component which moves the winding shafts relative to the machine frame, such as a rotary plate or carriage.

[0043] FIG. 2 now shows the same winding device as FIG. 1, but with a new winding shaft 6 moved further towards the film web 2 and the cutting device just inserted into the transport path of the film web 2. The new winding shaft 6 is preferably arranged upstream of the blade 8, that is, against the transport direction z.

[0044] FIG. 3 shows the same situation as FIG. 2 in a plan view. It is particularly well visible here that the cutting device, in the exemplary embodiment shown the blade 8, comprises a cutting edge 12 which has an interruption 13. The effect of this interrupted cutting edge becomes apparent in the FIGS. 4 to 8.

[0045] FIG. 4 shows the same view as FIG. 3, but with the film web 2 transported further onto the first spool 3. Due to the interruption 13 of the cutting edge 12 of the blade 8, cut edges 14 were produced since the cutting edge 12 cut the film web but the film web was not changed in the region of the interruption 13, wherein the cut edges in the exemplary embodiment shown extend approximately in a transverse direction y to the transport direction z. The cut edges 14 now form the new end of the film web 2. The respective counterparts of the cut edges 14 are in FIG. 4 hidden behind the cutting blade 8 and form the new start of the film web 2, which is to be wound onto the new spool. An uncut region 15 of the film web 2 remained in the region of the interruption 13 of the cutting edge 12, which uncut region is now elongated due to the continued rotary movement of the spool (force action) and the counter rotation of the new start of the film web 2 against the blade 8 (counterforce). This situation is visible in FIG. 5.

[0046] FIG. 6 shows a particularly preferred exemplary embodiment of the invention in which the uncut region 15 is further elongated until the cut edges 14 come to rest or at least almost rest on the layer of the wound-up film web lying underneath. In this final step, the uncut region 15 is cut. It is shown that a drive force is further applied to the spool 3 until the uncut region tears off, which is shown in FIG. 7. Another cut edge 16 is produced, which is set back in relation to the cut edges 14, that is, projects beyond the cut edges 14 against the transport direction z. The cut edge 16 has a random contour, which typically is not reproducible.

[0047] A respectively equipped cutting device can also actively perform the cutting. Another blade may be provided for this purpose. But it is also possible that the interruption 13 of the cutting edge 12 only is a section 17 of the cutting edge set back in an orthogonal direction x (see FIG. 1) of the film web 2. The blade 8 can then be moved into the transport path of the film web 2 for producing the cut edges 14 that the cutting edge 12 produces the cut edges, but the set back section 17 of the cutting edge has not yet come into contact with the uncut region 15. If a complete cut-off is to be achieved at a later time, the blade 8 can be moved further in a subsequent step, such that the set back section 17 gets into the transport path of the film web as well and cuts the same.

TABLE-US-00001 List of reference numerals 1 winding device 2 film web 3 spool 4 winding shaft 5 winding tube 6 winding shaft 7 winding tube 8 blade 9 blade carrier 10 lever arm 11 axis of rotation 12 cutting edge 13 interruption 14 cut edge 15 uncut region 16 cut edge 17 set back section D direction of rotation x orthogonal direction y transverse direction z direction of transport