Print Quality Inspection: Automatic Detection Equipment And Technologies - Print, Quality Inspection
Today, in print, Package Industry, more and more manufacturers are financially capable
of buying all kinds of advanced printing and finishing equipment, and with the Printing Equipment Grades improve, various high-end printing is also increasing. A general review of domestic printing companies, some already have advanced and similar equipment, with the same production technology capabilities, but the result is a product similar enterprises lack competitiveness.Printing How can the industry maintain its leading position, and then obtain a reasonable profit, the key is the company itself or to provide non-homogeneous characteristics. For example: a unique new technology and good and stable print quality. But the unique new technology and good and stable quality is measured in monetary terms is difficult, and indeed the quality, for them to have a good and steady long-term overall quality, must have a reasonable quality of sound Management System.
Whether manufacturers or end users, we all want a good and stable quality. In theory, a good print quality should be the manufacturers and end users on a particular print through consultation, to confirm an agreement, must have clear, measurable and reasonable description. Although domestic product in the product brush "quality" is defined to have a certain standard, but because of printing different standards to different parts, more likely because of the different specific actors, in the print into the actual testing time, test results are too many external factors, human factors, difficult to achieve unity, stability criteria can be quantified. How to achieve a unified, stable quality can be quantified standards? Early establishment of the industry is eager to such a quality standard, and are actively looking for a reasonable way to test the best.
In printing quality testing, the U.S., Europe and Japan and other countries have made great progress. Early 70s in the 20th century, manufacturers have been actively working on image processing system used on the visual information into digital print quality achieved by the computer to "see" and "cognitive" on the print to high-speed, high precision, 100% real-time detection, the total elimination of human errors, establish a unified, quantifiable test. Now offers automatic print quality testing equipment with Swiss BOBST, the United States PROIMAGE, Japan, DAC and TOKIMEC.
Automatic print quality testing equipment 1. Work Automatic print quality test equipment used is the first multi-detection system using high-resolution, high-speed cameras take standard image, in this basis set certain standards; then taken to detect the image, then compare the two . Linear CCD sensor for each pixel changes in the amount of light into electronic signals, if found to be detected after comparing the image with the difference between the standard images, the system has been detected that this image is unqualified. Printing process for a variety of errors, the computer is only a standard image and are detected after comparing the different images, such as stains, blot the defects such as chromatic aberration are included.
2. Detection accuracy Early detection is used to print quality images and is the standard gray scale images contrast detection technology, is now more advanced technology is based on comparing the three primary colors RGB. Automatic machine detection and eye detection, the difference? Human visual example, when we attentively watch a print, if the print contrast color is stronger, then the human eye can see, the smallest defects, contrasting colors is obvious defect of not less than 0.3mm; but rely on people ability is difficult to maintain continuous and stable visual effects. But another way, if it is printed in the same color scheme to find defects, especially in a pale line, then look for quality defects, defects in the human eye can detect at least 20 gray level difference. The automated machine is able to easily find the defects 0.10mm size, even if the only defect with the standard image of a gray-scale difference.
But from the actual terms, even comparing the same full-color system, its ability to distinguish different color.
by: gaga