Inspection and Control of Spot Color Printing Quality
Inspection and Control of Spot Color Printing Quality
In the printing of color box packaging products, because spot color printing has a large area of solid color blocks, the color is dazzling, and the shelf display effect is good; the color difference caused by dot overprinting and dot deformation is reduced, and the color is stable and easy to identify. Therefore, a large number of special Color printing is its basic feature. At present, domestic color box printing enterprises are relatively backward in the measurement and control of spot colors, and most of them are still in the stage of blending spot color inks by relying on the experience of the workers. shortcoming. Therefore, the use of color matching system is the best solution to the problem, and it is also the mainstream technology and development direction of international color box quality control and inspection.
Spot color ink matching system is a system composed of computer, color matching software, spectrophotometer, analytical balance, ink uniformizer, ink spreader and printability meter. The spot color ink matching system can store the parameters of the printing materials, inks and color matching data of the color box printing enterprise in the system database through tests and experiments. Perform color matching analysis and color matching operations, control color matching conditions according to the CIELab value, density value, and △E of customer samples and color matching samples, and provide printing control parameters, so that the data of spot color ink matching can be realized. For example, the Swiss GretagMacbeth ink formulation system including the hardware spectrophotometer SpectroEye and InkFormulation, its SpectroEye can not only measure the dot and density value of the printed matter, but also the hue (Hue), saturation (Saturation) and lightness (Luminosity); InkFormulation only needs to be extremely An accurate database can be established with a few concentration scales. Color matching data can be oriented to offset printing, flexo printing, gravure printing and screen printing, and can provide a variety of sorting methods for ink formulations, such as similarity by hue, metamerism value, spot color ink unit price, ink consumption, Ink layer thickness, etc. Therefore, the application of digital fundamentally breaks through the constraints of experience color matching, and meets the development requirements of higher quality, shorter cycle and lower cost in the color box printing industry.
