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FLEXO Magazine : August 2013
100% INSPECTION Typical video cameras come with a wide variety of options, such as sampling inspection, defect detections, bar code veri- fication, register control and in-line color management (delta e tracking), etc. The modularity of these designs allows the system to be customized to individual production processes. Today, 100 percent print inspection and digital web monitor- ing is becoming more common in applications such as, flex- ible packaging, liquid packaging and cigarette packs. When used on a printing press, 100 percent inspection can help to reduce substrate waste significantly by correcting the occur- ring causes of errors immediately. In addition, it provides the basis for defect tracking with the aim to deliver 100 percent error-free print. Converters who opt for 100 percent inspection systems gain a competitive edge as more and more consumer product companies (CPCs) are insisting on this from their suppliers. Standard functions for 100 percent print inspection provide the operator with an optimum overview of the production at any time, to assist in analyzing and rectifying errors, and thereby ensure maximum production performance and qual- ity. High-power illumination is designed for the inspection of all opaque printing materials. Illumination units for the inspec- tion of transparent or reflective material can be added. Special algorithms allow reliable inspection of flexible ma- terials, such as polyethylene (PE), bi-axially oriented polypro- pylene (BOPP), orientated polypropylene (OPP), low density polyethylene (LDPE), etc. , by detecting defects even before they cause any waste. Also, flexible sensitivity settings put an end to false alarms, so that particularly critical areas can be monitored closely, while insignificant areas can be ignored. The inspection results can be displayed in a roll map on the main screen according to the position on the print format and defect class. Each relevant defect is clearly documented in the defect catalog with a maximum of three images: the first defect image, the image with the largest defect and the last defect image. These clear displays, combined with the easy handling, encourage the operator to make a fast and money- saving decision before countless feet of waste are produced. If 100 percent inspection is not yet required by your custom- ers, it may soon be. So, it is a wise choice to opt for a provi- sion for the future installation of a 100 percent inspection system, even if the press is initially equipped with a more conventional video camera system. 58 FLEXO august 2013 www.flexography.org