Spot color ink is relative to the traditional four-color ink, refers to one or more than two ink blending together, and add some auxiliary materials, preparation of a new kind of ink, and to meet the requirements of the printing, and the color of the need. Special color printing ink because of the large area of the field color printing color, the color effect is good, reduced due to dot overprint, dot deformation of color difference, color stability, color gamut width. Therefore, the cigarette packaging, labels, in order to achieve a special artistic effect, wide application of spot color ink printing. Spot color printing can not only solve the four-color printing due to printing and ink balance, you can also meet the requirement of the quality of innovative design, and printing ink and water balance in the process is also relatively easy to control. 

Color matching spot color ink is divided into the traditional spot color ink and color ink color computer two. The author based on the summary of offset printing spot color ink matching technology research experience, for spot color ink matching technology put forward some suggestions: spot color ink matching method is with years of operation personnel of skills and experience, through observation and contrast color, the first artificial take ink, then compared with the original color, in this process will be in the traditional spot color matching method and mechanical uniform ink mechanism combination, so you can reduce officers misjudgment caused by the printing color difference. 

(1) sample preparation of general principles and the matters needing attention: specimen shall be made by the same person, manipulation should be consistent; making a set of color samples of ink must be a one-time weigh; color sample production conditions should try to simulate the production process conditions, auxiliary types, dosage, time, temperature and the post treatment conditions must also with a similar production conditions. 

(2) try to use the minimal amount of ink color inks, because the less, the better mixing effect and ink color saturation will. 

(3) in the course of matching try to choose the same manufacturers or the same series of ink, otherwise it will produce color uneven phenomenon, serious when the ink will agglomerate and useless. 

(4) ensure that the IGT proofing machine rollers intact and clean. This affects the accuracy of the samples is large, in the measurement of sample data, three test points can be taken in the different positions of the same sample are measured respectively, finally take the average 

Refers to the dark ink in the ink concentration ratio of relatively high, transparent white content, mainly in color ink mixing. For color concentration and the demand is higher, need two printing products, because of the ink layer thickness, the printing on the back of the prone to sticky dirty, can use fixed fast drying ink, or the amount of add some red dryness oil, conditional can also join in favor of bottom dry desiccant and antisticking agent (provided by professional ink company), select the absorbent paper, printing can be appropriate to reduce the machine speed and increasing the dusting. Also shot with blue light with high content of blue ink deployment should be attention to shoot the light blue chemical structure containing antioxidant moieties take Shiyin, production principles, to prevent printing poor drying. 

Anyway, in the printing and packaging, resulting in spot color for all kinds of reasons, according to the actual production in different causes of specific issues specific analysis, as the deviation of the control to a minimum, take corresponding countermeasures in the light of the specific reasons to produce customer satisfaction with the product packaging. As long as the color and printing process measures properly, you can better control the color. Mainly the deployment of spot color and the printing process of standardization, data management, at the same time, the production environment remained relatively stable. 

With the further deepening of China's opening to the outside world, mutual blending of eastern and Western culture, of spot color ink preparation increasingly demand increases, is also our printing, ink industry is in line with international standards of relatively fast method of, after repeated color test, to establish accurate, fast, parity color schemes, and printing, printing ink industry colleagues together to meet the challenge of the new technology, metal color "six color version of the spot color ink standard. These new varieties containing updated with ink ideas, it is worth we work together to study and explore.