The matching of UV offset printing ink in printing

UV ink is an imaging substance used to form graphic information in the printing process, so the ink plays a very important role in printing. It directly determines the tone, color, and clarity of the image on the printed matter. As printing processes, substrates and other requirements are getting higher and higher, in order to match different substrates and printing processes, the technical requirements for inks have also increased. As a result, a variety of different ink formulations are formed, each of which has different ink characteristics and characteristics, and the correspondence and specificity are stronger. Therefore, when printing companies choose inks, they must not only meet their own printing processes and printing requirements, but also meet national VOC emission standards, national environmental protection policies, laws and regulations. In order to save money and time, avoid unnecessary trouble.

In order to meet the customer's consumption requirements, printing companies must meet their customer's needs, especially the printing process must also meet specific conditions and some additional conditions. Therefore, when printing companies choose inks, they must consider the compatibility of the inks with various requirements in order to adhere the inks to the substrate without changing the color, and become accurate, clear and bright graphics. Let's talk about the matching of UV offset printing ink in printing from the following aspects:

Matching of UV offset printing ink with environmental protection requirements of target product industry

In China's printing industry, UV offset printing inks are used in the packaging and trademark printing fields of various industries such as tobacco, wine, cosmetics, electronics, food and medicine. Relevant industry regulations and environmental protection requirements exist in different industries. As an indispensable part of printing products, ink must match the relevant industry regulations and environmental protection requirements of the target product before it can be put into production. For example, in the electronic and electrical industry, because halogen will reduce the electrical properties of products after welding and produce corrosiveness, and electronic wastes and plastic products containing halogen compounds are susceptible to dioxin-like compounds after burning, and cause health hazards through bioaccumulation . Therefore, the printed products used in the electronic and electrical industry must meet the international halogen-free standard of IEC 61249-2-21: 2003.

Matching of UV offset printing ink and printing substrate

The main printing substrates on the market now include paper, film, fabric, metal, ceramic, etc. The paper materials can be divided into newsprint, letterpress paper, offset paper, coated paper, aluminum platinum paper, special paper, etc. Film materials include PVC, PE, PET, PP, OPP, ABS, PA, etc. Different printing substrates have different surface tensions due to their different material structures and surface treatment methods. The same ink will show different adhesion on different printing substrates. For printed products, adhesion is one of the most basic conditions that need to be met. In order to ensure that the ink has sufficient adhesion on the printing substrate, no layer, no falling off, you must choose a UV that matches the printing substrate Offset ink.

The matching of the ink and the printing substrate is not only reflected in the adhesion of the ink on the printing substrate, but also the matching of the chemical properties of the ink and the printing substrate. For example, if the ink erodes the printing substrate, a bite phenomenon occurs, which causes the ink hue to change and the color of the printed sheet is inconsistent. Thin-film printing substrates are precipitated by some of the chemical substances added to the material, the precipitated chemical substances corrode the ink film layer, and the phenomenon of back sticking occurs.

Matching of UV offset printing ink and post-press processing

Due to the different post-printing processes of various products after printing, the corresponding requirements for ink performance will also be different, such as die-cutting, indentation and other post-press processing processes. In order to avoid color bursts during processing, you need to choose good flexibility. Ink; bronzing, blister and other post-printing processes need to choose inks with good flexibility and high surface tension, otherwise the phenomenon of bad bronzing and blister will not occur.

Matching of UV printing ink and product application 

Due to the different applications of printed products, there will be different requirements for inks. For example, inks printed on cards have high surface hardness and good friction resistance, otherwise printed cards are prone to scratches and damage; and in cosmetic packaging In order to attract consumers' attention to products, it is necessary to choose inks with beautiful colors, which should not be faded, and have excellent light resistance. Otherwise, after being left for a long time, the product will fade, the product will no longer be beautiful, and it will still look old, which will greatly reduce the consumer's impression of the product.

Therefore, when printing, not only the physical characteristics of the printed product, post-processing requirements, application directions, and environmental protection requirements of the industry are well understood, but also the conditions of the printing process and the actual conditions of the printing substrate must be considered to choose the appropriate Only matching UV inks can produce exquisite prints.