A system to help improve printing quality, detect printing failures, defects, and improve color, shape and type, and overall accuracy in the printing process, has formed a wide variety of forms, and this is the latest technology in printing It will continue to develop.
Printers expect to produce labels that are exactly the same as the customer's proofs and correct, and testing instruments help operators meet this requirement by alerting operators to remove defects and inconsistencies. The inspection during the printing process allows the operator to make adjustments to solve the problem. When the printing inspection is completed, it is guaranteed that only acceptable labels will be shipped to customers.
Printers can already obtain some types of testing instruments on the market, from simple to complex. Basically, it is a hand-held or online strobe light, which can help the operator to detect the printed matter. A little further; it is a sample system based on the principle of photography, which can capture the image of the format area. These video format detection equipment are most popular in the narrow format industry. According to John Thome, general manager of BST Pro Mark USA: "70% of these systems are used in narrow-format flexo machines."
Another type of inspection system is the printing process management system. Thome said, "Premius has a video function, which can also automatically detect defects, barcode errors and job reports. It is used to manage the printing process. The system can see the color and tell you the color difference. It can also analyze the barcode and tell you whether the barcode meets the ISO certification.
Val Rimas, vice president of sales and marketing at Rotoflex International in Canada, pointed out the difference between area scanning and single-line scanning inspection systems. "The content obtained by the area scan works well, but it is characterized by repetition," he said. "The image taken by the camera read through the pixels is stable. The single-line scan reads the data line by line. It is like cutting the picture into stripes. Put it in the part until you get the whole picture. There is no duplication, which means you can get it whenever you want. You can detect small details. "
The last type of system is a 100% detection system. Jim Doerr, president of TruColor Vision Systems Inc., said: "Photography based on a 100% inspection system automatically finds and refines all printing defects. Once repetitive and irregular defects are found, the indicator or alarm will alert the operator."
Thome said the 100% inspection system uses single-line scanning camera technology, which is different from other inspection systems that use CCD camera technology. He said the systems are "more expensive than video-four to six times the price." These systems use fixed lenses, so operators cannot zoom in or out to see specific aspect ratios. Therefore, according to Thome, 100% inspection systems are more frequently used on rewinders than printing presses.
Along with this is the topic of the balance between online inspection and offline inspection. Online inspection is inspected during the label printing process, while offline inspection is inspected on the rewinding machine in the post-press stage.
Al Spendlow, AB Graphic International Inc. ’s executive vice chairman explained, “In most cases, online inspections are equipped with cameras and monitors, which take snapshots of the format, allowing the press operator to not slow down or stop the format speed. Rectify printing-related problems under certain circumstances. More mature systems such as FleyeVision's printing equipment record all printing defects. During the printing process, the press operator can use high precision to look back. This system can print detailed defect reports. Accepted print lengths to prevent excessive operation at high cost.
By printing online inspection, the operator has the opportunity to correct the problem. Because online inspection systems allow immediate execution, they reduce the amount of scrap produced by defective labels. Doerr added, "Online inspection also allows machines to operate at higher speeds while increasing productivity."
According to Lance Shumaker, President of Advanced Vision Technology (AVT), Aiweite America, "The biggest benefits of online inspection are real cost savings, reduced scrap and better productivity."
Off-line inspection provides more quality control functions because it helps to find defective labels that have been printed and allows printers to destroy these labels before they are shipped to customers.
Shumaker said whether to use online inspection or offline inspection depends on how the printer wants to try to provide customers with finished products. "In the pharmaceutical industry, monitoring on the rewinder is necessary," he said. Some printers use both online and offline inspection methods, but this is not common. Shumake says more printers are starting to use online inspection.
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