Method for determining the winding quality of a film roll

Abstract

Method for the determination of the winder quality of a film roll (10) of a film (30) on a winder roller (20) comprising the following steps: determination of the roll hardness (WH) of the film roll (10) during the winding on of the film (30) on the winder roller (20), determination of a variation from the determined roll hardness (WH) of the film roll (10) from at least one standard value (V1, V2) for the roll hardness (WH) of the film roll (10), determination of the film roll (10) using the determined variation.

Claims

1. A method for the determination of the winder quality of a film roll of a film on a winder roller comprising: determination of the roll hardness of the film roll during the winding on of the film on the winder roller as a measure for the size of air spaces between film layers of the film in a direct manner at the film roll, determination of a variation from the determined roll hardness of the film roll from at least one standard value for the roll hardness of the film roll, determination of the film roll using the determined variation; wherein only for the two outermost layers the determination of the roll hardness occurs.

2. The method according to claim 1, wherein at least the step of determination of the roll hardness of the film roll occur continuously.

3. The method according to claim 1, wherein the step of determination of the roll hardness of the film roll during the winding on is contactlessly performed.

4. The method according to claim 1, wherein the step of determination of the roll hardness of the film roll during the winding on is performed using at least one of the following methods: ultra sonic measurement laser measurement radar measurement, terahertz, microwaves contacting track roller.

5. The method according to claim 1, wherein at least two standard values define a standard area as upper standard value and lower standard value.

6. The method according to claim 1, wherein a step for the submission of at least one operating parameter is performed which influences the winder quality wherein these operating parameters are configured according to the dimension of the film of the film roll.

7. The method according to claim 1, wherein at least one of the determined winder quality and the determined variation is used as an input parameter for the regulation of at least one operating parameter which influences the winder quality, at least one of the following operating parameters: web tension contact roller web tension winder roller contact pressure contact roller.

8. The method according to claim 7, wherein during the regulation of at least one operating parameter a radial pressure pattern is considered which adjusts during the winding on of the film roll.

9. The method according to claim 1, wherein in direction transverse to the winding on direction of the film an at least twofold sectional determination of the roll hardness of the film roll occurs during the winding on to the winder roll.

10. The method according to claim 9, wherein in the direction transverse to the winding on direction of the film the roll hardness or a manufacturing profile of the film is kept constant orby the regulation of at least one operation parameter.

11. The method according to claim 1, wherein on the basis of the determined winder quality or the determined variation an alteration of a manufacturing profile of the film is performed in a previous production process.

12. A monitoring device for monitoring of the winder quality of a film roll of a film on a winder roll comprising at least a sensor device for a determination of a roll hardness for only two outermost layers of the film roll during the winding on of the film on the winder roll as a measure for the size of air spaces between film layers of the film in a direct manner at the film roll, further comprising a control device, which is configured for the determination of a variation of the determined roll hardness of the film roll of at least one standard value for the roll hardness of the film roll and the determination of the winder quality of the film roll by means of the determined variation.

13. The monitoring device according to claim 12, wherein the control device is configured that at least the step of determination of the roll hardness of the film roll occurs continuously.

14. The monitoring device according to claim 12, wherein the control device is configured for changing between manual, semi automatic and full automatic operation.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) Further advantages, features and details of the invention result from the subsequent description in which embodiments of the invention are described in detail regarding the drawings. Thereby, the features described in the claims and the description can be individually or in any combination be essential for the invention. It is schematically shown:

(2) FIG. 1 an illustration of the monitoring device according to the invention

(3) FIG. 2 different layers of the film with a first size of an air space

(4) FIG. 3 different layers of a film with a second size of an air space

(5) FIG. 4 a schematic drawing of a radial process of the roll hardness

(6) FIG. 5 an illustration of the temporal course of the determination of the roll hardness

(7) FIG. 6 a schematic drawing of the intervention size of the operation parameter on the film

DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

(8) The FIG. 1 shows schematically a winding on device with a winder roll 20 on which a film roll 10 is produced. Hereby the winder roll 20 is rotated and a film 30 is wound on the winder roll 20. In order to ensure a clean winding process a contact roller 40 is intended, which performs a corresponding contact pressure AD to the film roll.

(9) Like it is recognized in FIG. 1 a monitoring device 100 is intended. This is configured with a sensor device 110 and a control device 120. This sensor device 110 is configured in order to determine the roll hardness and the course of the winding on process at least in the uppermost layer of the film 30. This determination occurs particularly contact-free for example using ultra sonic measurement. Further, the control device 120 can be configured for the regulation of the operation parameter. This is shown by the dotted connection lines between the control device 120 and the winder roller 20 and the contact roller 40.

(10) During the winding on of the film 30 as the film roller 10 on the winder roll 20 different air space sizes as air spaces 60 are produced between the film layers of the film 30 according to the adjustment of the operation parameter. FIG. 2 shows a first embodiment of a film roller 10 wherein the film layers comprise relatively small air spaces 60 between themselves. This correlates to a relative hard embodiment concerning the roll hardness WH of the film roller 10. FIG. 3 shows greater air spaces 60 between the single films 30 so that correspondingly also a softer roll hardness WH of the corresponding film roll 10 is adjusted. The influence sizes, which lead to different intense roll hardness WH will be subsequently described in detail regarding FIG. 6.

(11) In FIG. 4 it is schematically shown that the course of the roll hardness WH does not have to be constant in radial direction of the film roll 10. It is rather possible that the roll hardness WH in the inner of the film roll 10 meaning around the radial area of the film roll 20 is significantly greater than in the outermost film layer area of the film roll 10. Therewith the subsequent processing can be influenced or the adjusted pressure course in radial direction of the film roll 10.

(12) FIG. 5 shows a schematic drawing how a certain roll hardness WH represents over the timely course. Particularly, in this schematic diagram drawing two standard values V1 and V2 can be recognized which define a standard area VB as an upper limit and a lower limit. At the right edge it can be recognized that the determined roll hardness WH exceeds the upper standard value V2. At this point an intervention will occur at the latest in order to again achieve the desired standard area VB. Thereby a regulation of the operating parameters can occur like subsequently described regarding FIG. 6.

(13) In FIG. 6 the film 30 is schematically shown. The film comprises a width from left down to right up and a corresponding film cross section which can be recognized at the right edge. In the direction of the winding on direction 50 the so called web tension WZ is directed. This web tension WZ is produced by a corresponding winder velocity of a winder roll 20 and the contact roller 40. In summary the web tension WZ results for a film 30, which is directed in winding on direction 50. This can be specifically configured and thereby particularly related to the film cross section in N/mm.sup.2. Mainly vertically thereto the so called contact pressure AD from the contact roller 40 acts. This can be configured likewise in a specific manner and relate to the width, in N/mm of the film 30. This parameter can be regulated as controlled value or manipulated value from the input value of the certain roll hardness WH of a method according to the invention.

(14) The previous description of the embodiments describes the present invention exclusively within the scope of examples. Naturally single features of the embodiments as far as technically reasonable can be freely combined to one another without leaving the scope of the present invention.

REFERENCE LIST

(15) 10 film roll 20 winder roller 30 film 40 contact roller 50 winding on direction 60 airspace 100 monitoring device 110 sensor device 120 control device AD contact pressure BZ web tension V1 first standard value V2 second standard value VB standard area WH roll hardness r radial distribution of the film roll t time response of the determination of the roll hardness