Inline inspection system ensures the quality stability of offset products

Offset printing is one of the most widely used printing processes at present, but it is difficult to control the ink balance in actual production, making the quality stability of offset printing products the most unstable in all printing processes.

Many printers often worry about the consistency of the print quality of the long version of the print job, and are more worried about the blemishes that often appear in printed products. In the high-grade prints, as long as there are a few defective products with defects, customers' complaints and grievances will be caused, affecting the customer's confidence and trust in the printers, and affecting the printer's market reputation and brand establishment.

In fact, the principle of the offset printing process determines that it is relatively difficult for the printing quality to remain stable. In the offset printing process, the change of ink and ink balance is non-linear with the transfer amount of printing ink and printing speed, and the ratio of ink and water in the printing process also needs to be adjusted at any time.

These changes will inevitably lead to frequent changes in the color, gradation, and overprinting of prints, resulting in unstable print quality; more likely due to excessive changes in the ink balance leading to the occurrence of printing defects such as scumming; and due to the high viscosity of offset inks and longer offset ink paths. The offset ink in the transfer path is easy to dry, and there is a problem that the dry-inkprint is transferred to the printed sheet; in addition, the dust, paper, and paper powder in the offset printing environment will also adhere to the printed matter, causing the print defect. Therefore, the occurrence of defects in offset printing products is inevitable.

The defect detection of traditional offset printing products mostly depends on the operator's experience for post-event inspection, that is, the inspection of the printed matter from the delivery department. However, this lack of post-mortem testing is entirely dependent on the experience of the operators, and the subjective detection of people is not measurable, and cannot guarantee the stability, repeatability and high efficiency of the test results.

At the same time, under the printing speed of nearly ten thousand sheets per hour in modern offset printing, even if the operator finds that the printed sheets cannot be adjusted in time, many bad prints are produced. The large-format prints that are opened or full-length rely solely on human eye detection, making it difficult to detect local fine defects in time. In long-lived multi-machine and multi-shift printing, the standard deviation of the printing operator's inspection will also cause great fluctuations in the quality of the printed matter. At the same time, even if the operator finds quality defects in the printed matter, how to sort out the existing printed sheets is also one of the practical difficulties that is difficult to solve.

The modern offset printing line inspection system is an advanced microscopic image processing system with printing, graphic collection, processing, display and warning installed on the last unit before the delivery unit of the offset printing machine. It can automatically detect color changes, overprinting, pull-ups, stains, etc., on the printed products, and compares them with standard values ​​of pre-acquired proofs, and gives image and sound alerts.

The advanced offset printing line detection system can automatically detect fine defects in a fine area of ​​one square millimeter, and perform a high-density detection every 0.5 mm in the paper feeding direction. The operator can select the important inspection area on the printed sheets. , Corresponding to the printing speed setting different sensitivity levels of detection, can be marked on the printed sheet showing the specific location of the defect, by inserting the label to show the specific position of the printed sheet, can detect the periodic appearance or the operator can not detect the ink spots, paste Versions, dirty, scratches, splashes, splashes, streaks, curls, wrinkles, and noticeable color shifts.

The superiority of the offset printing line detection system is that the system can work in line with high-speed offset printing presses to perform on-line inspections so that defects can be detected in a timely manner and corrected in a timely manner. This not only ensures the stability of the batch product quality, but also ensures flawless printing quality. In order to reduce customer complaints, enhance customer confidence and loyalty for printers and win more orders. At the same time, it reduces the waste of printing consumables, reduces the labor intensity of printing quality inspection personnel, and thus improves the efficiency of printing production, and meets the green printing development strategy of printing companies for energy saving and consumption reduction.

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