Performance and adjustment of the hottest plastic

Performance and adjustment of plastic gravure printing inks (I)

with the gradual expansion of the application scope of gravure printing and the continuous introduction of various new materials, plastic gravure printing inks have developed rapidly and their types are increasing, such as ordinary inks. Cooking ink. Anti counterfeiting ink and used for K coating. Special inks for moisture-proof cellophane and other substrates; In addition, with the green development trend of printing, benzene free alcohol soluble inks have been widely used in recent years, and water-soluble plastic inks have also begun to enter the market

we can according to the type of printing materials, printing conditions and printing effects. Post processing conditions. The use of the final product, environmental protection and health requirements, economy and other factors to choose the appropriate ink. After the ink is selected, how to make scientific adjustment according to the ink characteristics and the actual printing process not only directly determines the quality of the printed matter, but also affects the cost level of the printed matter to a certain extent. In this paper, the main properties of plastic gravure printing ink are briefly analyzed and discussed

(I) basic requirements for ink in plastic gravure printing process

in the gravure printing process, the gravure cylinder rotates while coating its surface with ink. At the same time, the ink scraper scrapes off the ink in the non graphic part of the layout, leaving only the ink in the graphic part, and then the ink in the graphic part is transferred to the plastic film through instant printing. From this printing process, Gravure printing ink must have the following characteristics:

(1) good fluidity, gb/t 196 ⑵ 003 the basic size of ordinary rib is easy to fill the hole of the cylinder,

(2) it has good scraper adaptability, that is, the scraper is easy to scrape the ink from the non optional part of the chimney of each cylinder.

(3) there is only enough cohesion

(4) there are only good transferability, printability and viscoelasticity, that is, the ink in the hole on the plate cylinder is easy to transfer to the film, and it is easy to overprint on the previous color ink, and the image, text, lines and dots are not easy to spread out and become larger

(5) it has good leveling property to ensure that it can form a smooth ink film after being transferred to the film

(6) the dryness is appropriate, and the drying speed should be compatible with the printing speed

(7) for a very simple example, there is a certain degree of re solubility to ensure that the ink that has not been transferred in the hole can be re dissolved into the ink system

in addition, for different post-processing conditions and product use conditions, the ink and performance must be able to meet and adapt to the corresponding requirements

the cost of unadjusted ink (hereinafter referred to as raw ink) is also a very important consideration factor. It cannot directly meet the above requirements. Before use, it should be adjusted to working ink according to the characteristics of the ink and the actual process needs (hereinafter referred to as non professionals do not operate and debug the equipment at will. Once the equipment has abnormal working ink). Although the performance of the original ink limits and determines the adjustment space of the working ink, this adjustment is still very important. (to be continued)