2009
DOI: 10.1117/12.827262
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Real-time defect detection in transparent multilayer polymer films using structured illumination and 1D filtering

Abstract: Today, typical polymer films consist of several functional layers, like printable surface or barrier layers. They are produced in coextrusion processes, in which the different materials are extruded through a single die and formed to a blown-or cast film with haul-off speeds up to 500 m/min. In the production of transparent multilayer films certain defects, called "interfacial instabilities", can occur. They emerge from shear stress and turbulences in the material flow during the process and result in a reduct… Show more

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Cited by 3 publications
(1 citation statement)
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“…), and uses multiple-line scan charge-coupled device (CCD) cameras and LED light sources. For multi-layer polymer films which normally experience interfacial instabilities during their production, Michaeli et al (2009) presented a structured backlight illumination approach with an image processing algorithm to detect these special types of defects. The system mainly consisted of a light source, a CCD line scan camera, and a 1D filter; was tested online and achieved 90% defects' detectability.…”
Section: Introductionmentioning
confidence: 99%
“…), and uses multiple-line scan charge-coupled device (CCD) cameras and LED light sources. For multi-layer polymer films which normally experience interfacial instabilities during their production, Michaeli et al (2009) presented a structured backlight illumination approach with an image processing algorithm to detect these special types of defects. The system mainly consisted of a light source, a CCD line scan camera, and a 1D filter; was tested online and achieved 90% defects' detectability.…”
Section: Introductionmentioning
confidence: 99%