Monitoring Method for Monitoring a Film Bubble in a Discharge Region Downstream of a Discharge Nozzle of a Blown Film Device

Abstract

The invention relates to a monitoring method for monitoring a film bubble (FB) in a discharge region (112) downstream of a discharge nozzle (110) of a blown film device (100), comprising the following steps: optically detecting at least one contour parameter (KP) of a film contour (FK) of the film bubble (FB) in the discharge region (112), comparing the at least one detected contour parameter (KP) with a specific preset value (VW), determining a contour deviation (KA) between the at least one detected contour parameter (KP) and the specific preset value (VW), outputting the contour deviation (KA) as monitoring result (UE).

Claims

1-27. (canceled)

28. A monitoring method for monitoring a film bubble in a discharge region downstream of a discharge nozzle of a blown film device, comprising the following steps: optically detecting at least one contour parameter of a film contour of the film bubble in the discharge region, comparing the at least one detected contour parameter with a specific preset value, determining a contour deviation between the at least one detected contour parameter and the specific preset value, outputting the contour deviation as monitoring result.

29. The monitoring method according to claim 28, wherein the optical detection acquires at least one of the following contour parameters: discharge angle from the discharge nozzle discharge radius at the discharge nozzle transition angle at a transition section transition radius at a transition section distance between the discharge nozzle and the transition section position of at least one partial section of a contour line at least a defect or perforation in the film bubble at least a position or course of a frost line of the film bubble

30. The monitoring method according to claim 28, wherein at least the monitoring result is output as an optical display for an operator of the blown film device or the monitoring result is output to a controlling module, which then carries out at least one controlling intervention on the blown film device based on the monitoring result.

31. The monitoring method according to claim 28, wherein at least the monitoring result is compared with a controlling storage, wherein a specific controlling intervention is determined or the optical acquisition is symmetrical or essentially partially symmetrical with respect to the film bubble.

32. The monitoring method according to claim 28, wherein at least the contour deviation or the monitoring result is monitored as a function of time.

33. The monitoring method according to claim 28, wherein, before the output of the monitoring result, a detection of people takes place and displayed faces of the people are made unrecognizable.

34. The monitoring method according to claim 28, wherein at least the position of at least one component of the blown film device or an operator is determined at least in addition to or in relation to the at least one contour parameter.

35. The monitoring method according to claim 28, wherein at least the contour deviation or the monitoring result is at least partially stored.

36. The monitoring method according to claim 28, wherein a detection at least of a sudden change of the contour deviation or of the monitoring result takes place.

37. A monitoring device for monitoring a film bubble in a discharge region downstream of a discharge nozzle of a blown film device, comprising an optical detection module for optical detection of at least one contour parameter of a film contour of the film bubble in the discharge region, a comparison module for a comparison of the at least one detected contour parameter with a specific preset value, a determination module for determining a contour deviation between the at least one detected contour parameter and the specific preset value, and an output module for outputting the contour deviation as a monitoring result.

38. The monitoring device according to claim 37, wherein the detection module comprises at least one of the following devices: 2D camera 3D camera combination of at least two cameras IR camera optical sensor.

39. The monitoring device according to claim 37, wherein at least the detection module comprises a repository device for a movable repository or the optical detection module comprises at least one sub-module for the detection of a specific wavelength or a specific wavelength range.

40. The monitoring device according to claim 37, wherein at least the optical detection module comprises at least one optical means for optically influencing the optical detection or a contrast device is additionally provided.

41. The monitoring device according to claim 37, wherein at least one illumination means is additionally provided for illumination of the film bubble in the discharge region.

42. The monitoring device according to claim 37, wherein at least additionally at least one marking means is provided for a marking on the film bubble or at least one cleaning means is provided for at least detecting a need for cleaning of the detection module or carrying out such cleaning.

43. The monitoring device according to claim 37, wherein at least one switching means is provided for switching off the optical detection module at least in the absence of the film bubble or in the presence of an operator.

44. The monitoring device according to claim 37, wherein at least one display device for displaying at least the contour deviation or the monitoring result is provided.

45. The monitoring device according to claim 37, wherein at least a storage device is provided for storing at least the determined contour parameters or the outputted monitoring results or at least one communication means is provided for transmitting at least the monitoring results or the contour deviations to a remote diagnostic module.

46. A calibration method for a calibration of a monitoring device for monitoring a film bubble in a discharge region downstream of a discharge nozzle of a blown film device, comprising an optical detection module for optical detection of at least one contour parameter of a film contour of the film bubble in the discharge region, a comparison module for a comparison of the at least one detected contour parameter with a specific preset value, a determination module for determining a contour deviation between the at least one detected contour parameter and the specific preset value, and an output module for outputting the contour deviation as a monitoring result, comprising the following steps: arranging the optical detection module in a detection position, allocating a detection region which at least partially overlaps with a discharge region of the blown film device.

47. The calibration method according to claim 46, wherein at least the allocation of the detection region is performed by recording the discharge region without film bubble or at least one step of an alignment of the optical detection module is performed.

Description

[0060] 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:

[0061] FIG. 1 an embodiment of a monitoring device according to the invention,

[0062] FIG. 2 a further embodiment of a monitoring device according to the invention,

[0063] FIG. 3 a further embodiment of a monitoring device according to the invention,

[0064] FIG. 4 a further embodiment of a monitoring device according to the invention and

[0065] FIG. 5 a representation of possible contour parameters.

[0066] FIGS. 1 to 4 show different ways of forming a monitoring device 10 according to the invention. FIG. 1 shows schematically how, for example, the monitoring device 10 comprises an optical detection module 20 in the form of a camera device. The optical detection module 20 is equipped on the optical detection side with an optical means 24 in the form of a lens system. In this way, the optical detection module 20 can now detect the film bubble FB shown as a contour in FIG. 1. As a two-dimensional camera device, the optical detection module 20 is capable of detecting the film contour FK and making it available for further processing accordingly. As can also be seen in FIG. 1, the film bubble FB discharges a central discharge nozzle 110 in the blown film device 100. The film bubble FB subsequently expands further within the discharge region 112 and solidifies along a frost line, which is not shown in greater detail, in order to be conveyed further upwards in parallel in this inflated state. The film web produced is then laid flat and wound up so that further processing of the film produced is possible.

[0067] The recorded and detected information on the film contour FK can now be further processed in a comparison module 30 and a determination module 40. For example, FIG. 1 shows the solution on a separate display device 52 of the output module 50 to display not only the acquired image of the optical detection module 20, but, not shown in FIG. 1, additional indications of a monitoring result UE. This is, of course, only one way of providing a display and thus a manual controlling intervention possibility.

[0068] FIG. 1 also shows a variant in which optical lines are applied to the film bubble FB as an optical grid with the aid of an optical marking means 80. These allow partial regions, in particular partial contours, to be made even easier to compare or determine by the optical detection module 20.

[0069] FIG. 2 is basically based on the solution as shown in FIG. 1. Here, the optical detection module 20 comprises a repository device 22 in a movable manner, so that a calibration method or an adjustment of the orientation of the optical detection module 20 is now possible through the connection to the blown film device 100. With the aid of a cleaning means 26, the lens of the optical detection module 20 can be kept free of contamination or even actively cleaned. A switching means 28 can be used to switch off the optical detection module when the blown film device 100 is at a standstill outside of production or when operating personnel is present in the recorded region.

[0070] In contrast to the embodiment of FIG. 1, the solution of FIG. 2 shows a communication of the output module 50 via a communication means 54, here cable-connected, with a controlling module 56 and a controlling storage 58 of the blown film device 100. The controlling storage 58 can now provide specific controlling interventions to reduce or eliminate detected contour deviations KA with a specific controlling intervention on the film contour FK. In the embodiment of FIG. 2, furthermore, an illumination means 70 is provided which illuminates at least a part of the film bubble FB with light for improved detection. In particular, this may be defined and specific wavelengths and/or wavelength ranges which correlate with a corresponding detection spectral specificity of the optical detection module 20.

[0071] FIG. 3 is also fundamentally based on the solution described in FIGS. 1 and 2. For improved optical detection, however, a contrast device 60 is arranged here as a contrast screen on the right side of the film bubble FB. This allows to facilitate a two-dimensional detection of the optical detection module 20, so that subsequently the evaluation in the monitoring device 10 can be carried out faster and with less computing effort. Also shown here is that by radio transmission from the output module 50, the corresponding transmission of the contour deviation KA and/or the monitoring result UE can be made to a controlling module 56.

[0072] FIG. 4 schematically shows the sequence of a method according to the invention in the monitoring device 10. The optical detection module 20 allows the contour parameter KP to be recorded and forwarded. In the comparison module 30, it can be compared with the comparison value VW, so that subsequently the contour deviation KA can be determined by the comparison in the determination module 40. On the basis of the contour deviation KA, the output module 50 can now output the monitoring result UE, in this case via the communication means 54. In this embodiment of FIG. 4, an optional possible storage device 90 is provided, in which contour parameters KP, preset values VW, contour deviations KA and/or monitoring results UE are stored or temporarily stored. This temporal storage can be used for feedback as a learning system, but also for evaluation over time and gradient monitoring.

[0073] FIG. 5 schematically shows one side of a film bubble FB of a film contour FK. Individual possibilities of contour parameters KP are shown here by way of example. In the case of the blown film device 100 starting from the discharge nozzle 110 in the region of the discharge region 112, a discharge region with a discharge angle α and a discharge radius AR can be detected. The contour line KL continues into the transition section 114, so that a transition radius UR and a transition angle β can be determined there. The individual contour parameters KP can be used here in combination or individually and also combined with other contour parameters.

[0074] 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

[0075] 10 monitoring device [0076] 20 optical detection module [0077] 22 repository device [0078] 24 optical means [0079] 26 cleaning means [0080] 28 switching means [0081] 30 comparison module [0082] 40 determination module [0083] 50 output module [0084] 52 display device [0085] 54 communication means [0086] 56 controlling module [0087] 58 controlling storage [0088] 60 contrast device [0089] 70 illumination means [0090] 80 marking means [0091] 90 storage device [0092] 100 blown film device [0093] 110 discharge nozzle [0094] 112 discharge region [0095] 114 transition section [0096] α discharge angle [0097] β transition angle [0098] AR discharge radius [0099] UR transition radius [0100] KL contour line [0101] FB film bubble [0102] FK film contour [0103] KP contour parameter [0104] VW preset value [0105] KA contour deviation [0106] UE monitoring result