Monitoring method for monitoring a film bubble in a discharge region downstream of a discharge nozzle of a blown film device
AssigneeWindmoller & Holscher
InventorsIngo Hehmann, Markus Bussmann, Martin Backmann
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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).
Claims19
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, and
- outputting the contour deviation as a function of time as a monitoring result, wherein gradients of the contour deviation are determined according to the function of time.
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 configured to optically detect at least one contour parameter of a film contour of the film bubble in the discharge region, a comparison module configured to compare the at least one detected contour parameter with a specific preset value, a determination module configured to determine a contour deviation between the at least one detected contour parameter and the specific preset value, and an output module configured to output the contour deviation as a function of time as a monitoring result, wherein gradients of the contour deviation are determined according to the function of time.
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 function of time as a monitoring result, wherein gradients of the contour deviation are determined according to the function of time, comprising the following steps:
- arranging the optical detection module in a detection position, and
- allocating a detection region which at least partially overlaps with a discharge region of the blown film device.
Dependencies are inferred from the claim text.