With the development of society, people's aesthetic ability is more and more strong, the customer for printing color reproduction are increasingly high requirements. In order to improve the quality of printing products, printing enterprises in the printing and packaging products and commercial printing products, usually need to use spot color ink, to ensure the printing of color can be perfect, faithful reproduction, and to accurate and skillful adjusting the spot color ink, printing operators should master deployment of spot color ink method, program and matters needing attention. 

Note the spot color ink matching 

1 ambient light source requirements 

Deployment of ink, the color temperature of light source environment should be to 6500k, color rendering index RA to more than 80, is to be defined in the international standard light source selection as far as possible. Otherwise, there will be a kind of ink in the observation of partial color, misleading, affect the color effect. 

2 kinds of ink selection principle 

According to the subtractive principle, should try to use the least amount of ink to adjust the desired spot color ink, that is able to use spot color ink transferred out of the two, it is best not to three types of ink to adjust, avoid by using ink variety, reduce the brightness of spot color ink, ultimately affect the print gloss and bright degree. In addition, in the deployment of a spot color ink, because of the difference of different ink manufacturers of ink nature. Therefore, we should try to choose the same ink manufacturers to produce the basic colors of ink, to avoid causing printing quality tracking difficulties and by ink mixing caused by improper of economic losses. 

The 3 commonly used methods 

The common method has two kinds, respectively is the finger extension method and ink scraping method. Finger extension ink sample method is refers to in the paper stained with a grain of Adzuki Bean like ink, with your fingers to ink extension into a piece of close to the printing ink layer, and standard sample color contrast judgment transfer ink effects. Need to pay attention to is that extension will be more brilliant than the kind of printing color of the same color. This is because the extension like no after printing pressure, ink layer coxcombry thicker. 

Scraping method refers to the small ink with this knife the spot color ink evenly coated on the rectangle of paper and then scraper to ink scraping into thin layers, then determined by human eyes the oil ink and standard ink color difference. Observation of scraping into thin ink of the reflected light, check ink complexion; observe scraping in ink layer thick parts of color, check the ink of the ink; scraping the back of the light source to observe the color of the ink layer, can check the ink color. Which were examined by ink color tend to find ink color difference, to judge the adjusting effect of the dark ink is very effective. 

4 records to be detailed 

Do small deployment of spot color ink mixing ratio and ink types and printing ink production batch number, ink manufacturers, amount of the additives and the spot color ink for which batch printing products record, officially a deployment of spot color ink, ink quality is good or bad and the next copy brush the product tracking to provide reference. 

5 the appropriate amount of spot color ink 

The spot color ink amount to meet the current batches of the product use and a slight surplus, to avoid the insufficient amount of ink to fix the deployment, resulting in products with a batch of hue difference, affect the quality of printing, and can cause a waste of ink. 

6 pay attention to printing methods and characteristics 

The deployment of spot color ink, should be clear with ink for printing any way. This is because the formation of different printing ink layer thickness is different, therefore the presented color is also different. 

7, the printed products 

The deployment of spot color ink, to consider the color ink used for printing the products. Usually bright color printing packaging, in the field, in order to make the ink uniformly thick and has a high gloss, in the deployment of light colored ink can choose white ink and rcheulishvili oil as diluent agent, and adding white dryness due to oil, usually white dry oil to add volume of about 3% ~ 5%, adding amount of the general assembly to induce crystallization, resulting in ink dull; addition amount is too small will lead to the emergence of back stick dirty printed matter. 

8 consider the finishing characteristics 

Also consider the finishing characteristics of the deployment of spot color ink. For example, when printing requires glazing, choose normal spot color ink can, if selected for resistance to friction and good spot color ink, not only the high cost and affect the polishing effect. 

9 standard 

Spot color ink is qualified or not should not be the operator's recognition as a benchmark, but to end printing can let customer satisfaction as a benchmark. Therefore, after the deployment of spot color ink, must be on the machine printing test, and with the standard proofs were confirmed to meet the requirements before mass production. In addition, in front of the formal batch printing, but also carefully contrast prints and the standard proofs whether there are differences in, if it is found that the hue error should be corrected promptly. 

In a word, in order to master the deployment of spot color ink technology, we must not only have a solid theoretical foundation for the professional, must in practice more experience, and pay attention to learning the new ink deployment technology and detection means, to meet the needs of the continuous development of printing technology.