SWITCHING DEVICE AND METHOD FOR SWITCHING A FLAT FILM MACHINE FROM AN INPUT PRODUCT TO A SUBSEQUENT PRODUCT

Abstract

The invention relates to a changing device (10) for a changing of a flat film machine (100) from a feed product (EP) to a follow-on product (FP), comprising a sensor module (20) for acquiring at least one production parameter (PP) of the flat film machine (100) and an adjusting module (30) for a controlled change of this acquired at least one production parameter (PP), further comprising a controlling module (40) for controlling the adjusting module (30) for an optimized changing time (TU) for the acquired at least one production parameter (PP) from the feed product (EP) to the follow-on product (FP).

Claims

1. A changing device for a changing of a flat film machine from a feed product to a follow-on product, comprising a sensor module for acquiring at least one production parameter of the flat film machine and an adjusting module for a controlled change of this acquired at least one production parameter, further comprising a controlling module for controlling the adjusting module for an optimized changing time for the acquired at least one production parameter from the feed product to the follow-on product.

2. The changing device according to claim 1, wherein at least one of the following is acquired as a production parameter by the sensor module: width of a film track number of layers of the film track material composition of the film track quality parameter of the film track production stability of the film track thickness of the film track film thickness ratio of the film track temperature profile of the film track at least in transverse direction and/or in production direction width difference of the film track adjusting profile of adjusting bolts of the outlet nozzle machine parameter of the flat film machine discharge width of the outlet nozzle thickness profile of the film track.

3. The changing device according to any one of the claim 1, wherein the adjusting module is configured for controlling at least one nozzle parameter of an outlet nozzle of the flat film machine.

4. The changing device according to claim 1, wherein, as at least one nozzle parameter, a nozzle discharge slot of the outlet nozzle and thus the local thickness of the discharged film track can be changed locally in a controlled manner.

5. The changing device according to claim 3, wherein the adjusting module is designed for a controlled variation of an outlet width of the outlet nozzle.

6. The changing device according to claim 1, wherein the adjusting module is designed for a controlled variation of a stretching parameter of the flat film machine.

7. The changing device according to claim 1, wherein the controlling module comprises an input device for inputting at least the follow-on product and/or a changing time.

8. The changing device according to claim 7, wherein the controlling module is configured for an input of an optimization focus.

9. The changing device according to claim 1, wherein an output device for an output of a predicted changing time is provided.

10. The changing device according to claim 1, wherein the controlling module comprises a storage device for a specific storage of effected changings from feed products to follow-on products.

11. The changing device according to claim 10, wherein the storage device comprises an evaluation module for an at least quantitative and/or qualitative evaluation of the stored changings.

12. A method for an optimized changing of a flat film machine from a feed product to a follow-on product, comprising the following steps: acquiring at least one production parameter of the flat film machine, optimizing at least one adjusting action of an adjusting module for the at least one acquired production parameter, performing at least one adjusting action.

13. The method according to claim 12, wherein at least one of the following production parameters is acquired: width of a film track number of layers of the film track material composition of the film track quality parameter of the film track production stability of the film track thickness of the film track film thickness ratio of the film track temperature profile of the film track width difference of the film track adjusting profile of adjusting bolts of the outlet nozzle machine parameter of the flat film machine discharge width of the outlet nozzle thickness profile of the film track.

14. The method according to claim 12, wherein the optimized adjusting action changes an outlet thickness of an outlet nozzle of the flat film machine at least locally and/or globally.

15. The method according to claim 12, wherein the optimized adjusting action changes an outlet width of an outlet nozzle of the flat film machine.

16. The method according to claim 12, wherein the changing time is optimized so that at least it does not fall below a minimum production stability or does not exceed a maximum changing time.

17. The method according to claim 12, wherein the optimization is performed at least on the basis of or taking into account stored, successful changings.

18. The changing device according to claim 7, wherein the controlling module is configured for an input of an optimization focus of the following: threshold value for minimum production stability threshold value for maximum changing time threshold value for a maximum energy requirement threshold value for minimum product quality.

Description

[0067] Further advantages, features and details of the invention will be apparent from the following description, in which embodiments of the invention are described in detail with reference to the figures. Thereby, the features mentioned in the claims and in the description may each be essential to the invention individually or in any combination. The figures schematically show:

[0068] FIG. 1 an embodiment of a changing device according to the invention,

[0069] FIG. 2 the course of a production parameter and

[0070] FIG. 3 the course of several production parameters.

[0071] FIG. 1 shows schematically how a flat film machine 100 can be equipped. The film melt is discharged via an outlet nozzle 110 and drawn off from the large roll shown in the center. On this large roll, the film track chills and cools down so that subsequently the film track can be further wound up in the form of the feed product EP conveyed over a plurality of rolls.

[0072] If a changing is now desired in a flat film machine 100 according to the embodiment in FIG. 1, a production parameter PP is recorded in a first step with the changing device 10 at a plurality of sensor modules, here at two locations. In the middle, for example, the frost line, as well as the film thickness can be acquired as production parameter PP. At the bottom right, a film parameter, such as the gross width or the film thickness, can also be forwarded to the controlling module 40 as production parameter PP. With the aid of a storage device 44 and/or an input device 42, it is now possible to make controlled specifications as to the direction in which the follow-on product is desired. In order to achieve the changing, a nozzle parameter DP is adjusted here by the adjusting module 30 directly at the outlet nozzle 110, so that it can subsequently be tracked at the corresponding sensor modules 20 how the film track changes. As soon as the desired final parameter of the follow-on product FP is reached, the feedback of the resumed good production can take place.

[0073] FIG. 2 shows how the changing takes place over time. The production parameter PP can, for example, refer to the desired net width of the film product, so that, according to FIG. 2, a narrower follow-on product FP is now to be produced from the feed product EP. During the changing, for example by the method of lateral deckling blades, the width from the feed product to the follow-on product FP is continuously reduced, in this case by continuously reducing the outlet width of the deckling blades. The time required from the good production of the top left feed product EP to the good production of the bottom right follow-on product is also referred to as the changing time TU.

[0074] FIG. 3 shows a somewhat more complex representation of a production parameter PP over time. Here, the net width, the stability and the quality of the film product are shown. While the net width essentially changes abruptly from the feed product EP shown in FIG. 2 to the follow-on product FP, the quality and stability develop in a different way. Thus, the quality of the follow-on product FP will drop in a first time window during the changing, only to rise again in time t2. At this point, after the significantly shorter time t1, the net width of the follow-on product FP has already been reached again. However, only when the quality has also reached the desired continuous limit, which is necessary for the follow-on product FP, the good production of the follow-on product is carried out when the changing time TU is reached.

[0075] The foregoing explanation of the embodiments describes the present invention exclusively in the context of examples. Of course, individual features of the embodiments can be freely combined with each other, provided that this is technically reasonable, without leaving the scope of the present invention.

LIST OF REFERENCE SIGNS

[0076] 10 changing device [0077] 20 sensor module [0078] 30 adjusting module [0079] 40 controlling module [0080] 42 input device [0081] 44 storage device [0082] 100 flat film machine [0083] 110 outlet nozzle [0084] 200 film track [0085] EP feed product [0086] FP follow-on product [0087] TU changing time [0088] PP production parameter [0089] DP nozzle parameter