Innovation and application of UV screen printing ink
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UV screen printing ink new varieties
In the early days of developing UV inks, the choice of raw materials was greatly limited, which hindered the development and application of UV inks. However, in the past 10 years, a large number of experimental studies have greatly expanded the performance of UV inks. Raw material suppliers have also noticed the potential benefits of the UV ink market. Now, UV ink manufacturers have thousands of raw materials to choose from. The joint efforts of raw material suppliers and ink manufacturers have led to the innovation of many traditional inks, especially screen printing inks, which have led to the emergence of a large number of new screen printing inks, such as: thermoformed UV inks; multi-purpose UVs with strong adhesion Ink, can be used for printing of containers, POP (point of sale) images, labels, etc.; thick ink layer UV inks, including glitter pigment UV inks, thixotropic special effect inks, liquid substrate-forming, etc.; magnetic (magnetic-receptive) UV ink; refractory UV ink; high opacity UV ink; water-resistant UV ink; special effect imitation metal UV ink; long-acting luminescent UV ink. Let's take a look at some of the new inks.
Thermoformed UV ink
Research on thermoformed UV inks is in full swing. This ink has good adhesion and flexibility, can withstand stretching in thermoforming, and can stretch 8 inches or more in vacuum forming. Thermoformed UV ink formulations have been modified to withstand thermal bending, stretching and other post-processing on a variety of substrates such as styrene, polycarbonate, acrylic, PETG (diol modified PET), PVC and some metal.
Thick ink layer UV ink
In-depth research and understanding of the photoinitiator reaction mechanism allows ink formulators to formulate more special UV inks, including inks with high pigment content and the ability to form thick ink layers. Now, printers can choose 60-inch/inch coarse mesh, with a thickness of 300μm or higher for printing. The optional thick ink layer UV ink products also have thixotropic coatings and inks that produce embossed printing effects, which are expected to increase significantly in applications.
Molded substrate liquid UV ink
The high ductility resins and monomers used in the formulation of thermoformed UV inks can also be used to configure a new type of thick ink layer UV ink-forming substrate liquid ink, which can be referred to as a liquid substrate. formula. In other words, after the ink is cured, it is both an image forming material and a printing material. Pressure sensitive or electrostatically adsorbed images can be produced after printing depending on the ink formulation used. This printing method, which eliminates the need for printing materials, saves material and saves on material and die cutting costs, while also reducing turnaround time.
Magnetic UV ink
Another product that extends from the thick ink layer UV ink technology is the magnetic UV ink. The ink can be printed on a variety of substrates to make it magnetic, but the ink does not turn the image into a real magnet, but the printed image can be fixed by the solidified surface of the ink. This ink is suitable for printing images that often need to be replaced, such as newsstands, shelves, combined mold displays, and the like.
Special effect UV ink
The thick ink layer UV ink technology has led to the development of several new inks with special effects. The flash UV ink in combination with the large particle luminescent particles can produce a glittering effect on the printed pattern which requires printing with a coarse mesh screen to allow the glitter particles to pass. Another newly developed ink is a long-lasting luminescent ink that emits light for more than 14 hours. Other UV ink formulations are those that use a range of colors of pearl-like, spark-like or metallic particles, depending on the rough classification of the substrate. Inks with high pigment content allow printers to consider printing on dark substrates to ensure better color hiding power.
Refractory UV ink
Another research hotspot of UV screen printing ink technology is refractory UV ink, which is proposed for some consumers to pay attention to the safety of printed matter. The ink and substrate manufacturers work together to study solutions. Although UV inks have a relatively high flash point, UV inks will decompose and burn once the combustion limit temperature is exceeded. There are two ways to slow down the burning of UV inks. One is to use inhibitors in the ink to stop burning, reduce or even eliminate the flame. Another method is to design a UV ink formulation by mimicking a foaming fire retardant coating. In the foaming type fireproof coating, under the action of flame or high temperature, the coating is foamed and carbonized, and oxygen is isolated to prevent combustion and suppress the flame. It is important to remember that refractory UV inks alone are not completely fire resistant, and the ability of the substrate to expand and to suppress the flame is equally important.
New application of UV screen printing ink
Recent technological innovations have enabled ink manufacturers to produce UV inks with good adhesion, durability, flexibility and water resistance. Recent advances in UV ink technology have had a major impact in the following markets and applications.
Application on POP posters
In the past, only versatile POP inks exhibited good adhesion on a variety of substrates, including paper, paperboard, styrene, stretched polyvinyl chloride, and even some difficult-to-attach polyolefins. But a few years ago, the emergence of one-component UV inks completely changed the situation. This ink adheres well to polyolefin materials (PE, PP) and has good performance characteristics, such as label printing. Excellent ink film flexibility and water resistance exhibited in the field. This new ink eliminates the use of additives, reduces the waste of similar two-component inks, and also reduces ink inventory and improves economic efficiency.
Application on the container
The biggest advancement in UV screen printing ink technology should be in container printing. In the past, a variety of additives and ink systems were needed to accommodate different types of plastic containers, and now plastic containers for HDPE, LDPE, PET, PVC, PP, and other materials can be decorated with one-component, additive-free inks. These inks provide better hiding power and greater chemical resistance, while eliminating the need for additives and catalysts.
Application on hygroscopic plastics
The development of multifunctional monomers is one of the latest advances in UV ink technology, and ink manufacturers are using it to solve the problems of printing hygroscopic plastics, such as polyethylene labels and HDPE materials. These substrates are easily hygroscopic, and water vapor forms a fine barrier layer between the ink and the surface of the substrate, which affects the adhesion of the ink. Therefore, the ink layer on these materials is easily worn and peeled off. The ink formulated with this new multifunctional monomer greatly improves the water resistance on the hygroscopic material, the curing speed is faster, the ink layer is more glossy and firmer, and the ink layer is almost completely water resistant.
Development of UV screen printing ink
As raw materials continue to be developed, it seems that there is no way in which future UV-cured products will develop. In the early years, UV inks added a variety of additives to improve performance, and printers had to play the role of chemists in order to achieve good ink performance. But today, ink manufacturers can develop products based on customer needs and adopt more advanced technologies in ink production. Raw material suppliers also develop raw materials based on the needs of ink designers, unlike initially there are only a very limited number of raw materials available for designers to choose from.
Increased competition has forced ink manufacturers to adopt innovative technologies to improve ink performance while developing new areas for UV screen printing. Overall, the UV screen printing market has grown substantially due to the development of new UV inks. As raw material suppliers and ink manufacturers work together to develop new products and set new performance standards, this trend in the UV screen printing market will undoubtedly continue.