Label quality inspection (1)
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A system that helps improve print quality during printing, detects printing defects, defects, and enhances color, shape and type, and overall accuracy. It has a wide variety of forms, and this latest technology in printing It will continue to develop.
Printers expect to produce labels that are identical and correct to the customer's proofs, and the test instrument helps them meet this requirement by alerting operators to eliminate flaws and inconsistencies. The inspection during the printing process allows the operator to make adjustments and solve the problem. When the print inspection is completed, it is guaranteed that only acceptable labels will be shipped to the customer.
Printers have access to some types of inspection instruments on the market, from simple to complex. Basically, it is a hand-held or online strobe light that helps the operator to detect prints. A little further; it is a photographic-based sample system that captures images of the web area. These video format inspection devices are the most popular in the narrow industry. According to Thome: "70% of these systems are used in narrow-format flexo machines."
Another type of inspection system is the printing process management system. Thome says "Premius has video capabilities and can automatically detect defects, bar code errors and work reports. It is used to manage the printing process. The system can look at the color and tell you the color difference. It also analyzes the barcode and tells you if the barcode meets ISO certification.
Rimas pointed out the difference between regional scanning and single-line scanning detection systems. “The content that can be obtained by the area scan works well, but the feature is repeated,” he said. “The image taken by the camera read by the pixel is stable. The one-line scan reads the data line by line. Just like cutting the picture into strips. Put it into the part until you get the whole picture. There is no repetition, which means you can get it if you want it. You can detect small details."
The last type of system is the 100% inspection system. Jim said, “Photographs based on 100% inspection systems automatically find and refine all print cartridges. Once duplicates and irregular flaws are found, the indicator or alarm will alert the operator.”
Thome says the 100% inspection system uses single-line scanning photography, unlike other inspection systems that use CCD photography. He said the system is "more expensive than video - four to six times the price." These systems use a fixed lens, so the operator can't zoom out to see a specific aspect ratio. Therefore, according to Thome, 100% inspection systems are used more frequently on winders than on presses.
This is followed by the topic of online and offline detection. Online testing is performed during label printing, while offline testing is performed on the rewinder at the post-press stage.
Spendlow explained, “In most cases, the online inspection is equipped with cameras and monitors, taking a snapshot of the format, allowing the press operator to correct printing-related problems without slowing down or stopping the web. More mature systems For example, FleyeVision's printing equipment records all print defects, and the press operator can use high-precision lookback during the printing process. This system can print detailed 瑕疵 reports to prevent high cost overruns by determining acceptable print lengths.
By printing online, the operator has the opportunity to correct the problem. Since the on-line inspection system allows for immediate execution, they reduce the amount of waste generated by the sputum label. Doerr added, "Online testing also allows machines to operate at higher speeds while increasing productivity."
According to Shumaker, "The biggest benefit of online testing is the real cost savings, reduced scrap and better productivity."
Off-line inspection provides more quality control because it helps to find printed labels and allows printers to destroy them before they are shipped to customers.
Shumaker said that using online or offline testing depends on what the printer wants to try to provide customers with. “In the pharmaceutical industry, monitoring on a winder is a must,” he said. Some printers use both online and offline detection, but this is not common. Shumake said more printers are using online testing.