Safe-Ident Impurity
Guaranteed Detection of Impurities and Foreign Particles
Our solution checks plastic film for impurities during wrapping or winding processes. The analysis takes place while the finished film is unwound from the reels in order to be trimmed and, where applicable, printed before being rewound on new reels. During this winding process, small insects of dirt particles can easily cling to the film. Safe-Ident Impurity quickly and reliably detects impurities larger than 2x2mm (0.078”x0.78”).
Wide Area of Application
A high-resolution line scan camera with a line frequency of up to 51kHz captures the process which is subsequently analyzed by our software. The line scan camera captures one image line at a time in high frequency. The individual lines are then joined together so that a two-dimensional image is created as the film moves underneath the camera. The resolution of the image width is thereby defined by the resolution of the camera sensors, the resolution of the image height is theoretically unlimited, therefore high-resolution images of the surface of the film can be taken. When utilizing adequate lighting, impurities can be made visible.
Different combinations of camera, optics, and lighting enable the system to deal with varying working distances, reel widths and environmental conditions. Using a line scan camera makes it easier to take images without any reflections, despite the challenges posed by the surface of plastic film.
Different combinations of camera, optics, and lighting enable the system to deal with varying working distances, reel widths and environmental conditions. Using a line scan camera makes it easier to take images without any reflections, despite the challenges posed by the surface of plastic film.
Automatically Recognizing Relevant Areas
Pre-process algorithms enable an automatic definition of those areas of the image that should be checked for impurities. Margins that are not part of the film reel can thus be excluded from the analysis as well as specific areas on the foil, for instance, if these are printed, which might otherwise be classified as impurities.
The software analyses these limited search areas of the captured images and detects impurities that differ from the background in color and contrast in brightness. SAFE-IDENT Impurity is extremely precise in differentiating between dirt particles and other, non-critical irregularities on the surface, such as creases. This means an error is only triggered if there are actually insects or dirt particles on the surface of the film.
The software analyses these limited search areas of the captured images and detects impurities that differ from the background in color and contrast in brightness. SAFE-IDENT Impurity is extremely precise in differentiating between dirt particles and other, non-critical irregularities on the surface, such as creases. This means an error is only triggered if there are actually insects or dirt particles on the surface of the film.
Clear Data Logging
The data derived from analyzing the image can be saved in clear form to guarantee a complete documentation for quality control. An individual storage directory can be created for each production process, in which the images are saved. The user can decide whether the images should be saved continuously or just when impurities are detected. Additionally, images can be saved either as raw data or with annotations.
Restricting User Access
Important parameters for defining the area of analysis or the kinds of impurities should not be tampered with accidentally or intentionally. Therefore, the software can restrict access for the machine operator.
SAFE-IDENT Impurity is already successfully in use in the control of plastic film production.
SAFE-IDENT Impurity is already successfully in use in the control of plastic film production.
A look at the user interface:
