Precision Coating

Precision coating refers to processing that covers a surface by causing a film to adhere to it uniformly. By combining material design technologies with film thickness control, multi-layering, surface processing and other technologies, we can bestow diverse functions such as optical properties, barrier properties, and heat resistance. With extremely broad possibilities for application, this is one of DNP’s core technologies and we make use of it across business unit boundaries.

High-speed Thin Film Coating Technology


DNP has coating technologies that we employ in the manufacture of ink ribbons for dye-sublimation thermal transfer printers that print digital images, which enable us to apply various functional materials in a uniform layer about 1μm* thick onto ultrathin film only about 5μm thick, at a speed of several hundred meters per minute. We have also developed materials such as coloring agents that are exceptionally well-suited for thin film coating and overcoat materials, enabling us to succeed at high-speed thin-film coating in terms of both processing and materials.

* μm (micrometer): one millionth of a meter


Dye-sublimation thermal transfer printing media

Printers that use dye-sublimation thermal transfer printing media form images by transferring dyestuffs from ink ribbons to receiver paper. Controlling heat energy in the printer’s thermal head makes it possible to adjust the concentration of dyestuffs in each dot. Because they can reproduce some 16,700,000 colors in a single dot, these printers can produce high quality images. In addition to manufacturing and selling ink ribbons and receiver paper, DNP is further expanding and evolving its photo print business by developing new printing systems and providing a variety of solutions that make use of its systems.


Precision Thin-Film Clean Coating


This technology is based on a printing technique that involves applying a film of liquefied polymeric material while very precisely controlling film thickness. The manufacturing processes that allow sub-micron film thickness control and simultaneous application of multiple layers are performed in a high-level clean environment. By combining material design and optical design technologies that DNP has accumulated through years of printing experience, we will continue to supply functional optical films with both desirable optical characteristics and high-quality appearance.


Anti-reflection films

Anti-reflection films for displays—used to suppress glare from fluorescent or other types of light—were developed as a result of applying DNP’s precision thin film clean coating technology. DNP’s anti-reflection films hold one of the top shares in the world market for anti-reflection films used on liquid crystal displays. One of the reasons for the films’ popularity is the multi-layer thin film coating used in DNP’s films, which makes more effective use of optical interference compared to single-layer coatings.

Unevenness of the surface of the film causes light to scatter, making glare less noticeable. It has a matte surface.

Glare is reduced because reflected light waves are canceled due to interference. The surface is shiny.


Vapor Deposition


Vapor deposition is a coating technology whereby a gasified substance forms a coating on a plastic film within a vacuum. Alumina and silica are used in vapor deposition, with silica being used particularly in a method called “chemical vapor deposition.” In chemical vapor deposition, because silica is deposited on the film surface at the molecular level, it is possible to form a minute layer with strong barrier properties despite its thinness. DNP creates a variety of products by continuously performing chemical vapor deposition on flexible plastic film.



Barrier films

Barrier films are used to package goods such as foods and medical supplies in order to prevent oxidation or drying, and to keep out moisture. Unlike aluminum foil and aluminum-based vapor deposition films, DNP’s transparent vapor deposition IB* film can be used in a microwave oven and is amenable to detection of metallic impurities. Also, IB film is an environmentally friendly product whose production consumes less energy than that of aluminum foil.

* Innovative Barrier