Printing Technology's Strength: Precision Coating

Applied technology for uniformly applying ink developed for functional packaging materials

After Japan’s first supermarket opened in 1953, the demand arose for individually packed food products. Having already begun printing on cellophane wrapping paper in 1951, DNP quickly entered the market for food packaging materials, including paper containers and plastic film packages, while commencing an era of mass production, distribution and marketing. Plastic film packages became common, and in 1958 DNP developed and manufactured packages for Nissin Chicken Ramen, which is still popular in Japan today.

For this particular product, DNP’s coating technology for lightly and uniformly printing ink on the plastic film was an important development. Unlike paper, plastic film does not absorb ink, so a new technique was needed print on it. Therefore, DNP developed a pretreatment coating agent that enabled the ink to better adhere to the film. By coating the film with the agent and printing the ink onto it, DNP was able to print attractive lettering and designs on the packages.

The plastic film originally used for the instant noodle product was imported from the United States. Unsuited to Japan’s humid climate, however, the film would wrinkle when it absorbed moisture, which made it impossible to print cleanly and clearly. To solve this problem, DNP independently developed and commercialized a plastic film suited to Japan’s climate. It was not only necessary to make the packaging attractive on the outside; a protective layer was also needed inside the package to prevent moisture from escaping and the noodle soup oil from seeping to the package exterior. These challenges were solved by DNP’s coating and vapor deposition technologies.

Starting with the design of materials, DNP’s precision coating technology allows packaging materials to be coated with multiple layers and their surfaces treated, providing various functions for specific applications. This technology not only contributes to food safety but also makes packaging more user-friendly and convenient for consumers.

DNP Lighting Film

Attached to window glass to reflect and disperse sunlight, this film can make entire rooms brighter even on cloudy days.

Printing technology applied to design film like an ultrafine lens that can control light

DNP developed its lighting film by combining molding technology and optical design technology, which it cultivated by developing and manufacturing optical films used in all kinds of displays today, as well as its coating technology for uniformly coating resins. As a result of these technologies, the film can control the angle at which sunlight is reflected, ensuring that light entering a room reaches the ceiling and deep into the room. In other words, the film functions as if countless ultrafine lenses that reflect and disperse light are embedded inside it. The film surface is extremely even, allowing the film to be smoothly attached to window glass.

A Film Suitable for all Weather Conditions through Optical Design and Manufacturing Technology!

It is essential that the brightness inside a room from sunlight shining through lighting film is comfortable for the people inside. Since this subjective experience cannot be captured by measurement instruments, DNP constructed a test building, attached a prototype version of the lighting film on windows facing east, west, north and south, and carried out tests for an entire year.

The tests were repeated under all situations and conditions, including clear and cloudy weather in each season. Using the test results, DNP optimized the optical properties and structure of the film materials and made repeated fine adjustments to the refractive index of light. These efforts led to the completion of a lighting film for all types of weather conditions.

Lighting Film for Residential Window Glass as the Global Standard!

DNP developed its lighting film by combining molding technology and optical design technology, which it cultivated by developing and manufacturing optical films used in all kinds of displays today, as well as its coating technology for uniformly coating resins. As a result of these technologies, the film can control the angle at which sunlight is reflected, ensuring that light entering a room reaches the ceiling and deep into the room. In other words, the film functions as if countless ultrafine lenses that reflect and disperse light are embedded inside it. The film surface is extremely even, allowing the film to be smoothly attached to window glass.

Battery Pouches

Applying precision coating and post-processing technologies to make rechargeable battery casings lighter, longer lasting and safer

Helping make lithium-ion batteries lighter and more compact

Used in all kinds of mobile devices, lithium-ion batteries must be extremely lightweight and compact, and DNP’s battery pouches help make that possible. While conventional battery casings are made of metal, these pouches are made using a lightweight and thin film. Since the exterior materials must be strong and corrosion-resistant to protect the battery, DNP applies multi-functional coatings on battery pouch films as well as a lamination treatment to seal them so the substances inside will not leak. To develop its battery patches, DNP applied a combination of two printing technologies: precision coating and post-processing.

DNP applies multi-functional coatings on battery pouch films as well as a lamination treatment to seal them so the substances inside will not leak. To develop its battery pouches, DNP applied a combination of two printing technologies: precision coating and post-processing.

DNP as a Pioneer in Developing Battery Pouches

DNP began developing battery pouch technology in the 1990s. At that time, the practical application of lithium-ion batteries was just beginning, but DNP anticipated their emergence as next-generation batteries. The Company succeeded in commercializing its pouches as lithium-ion battery packs in the latter half of that decade and then worked to coat the products to make them multi-functional, and make them thinner by laminating the exterior materials.

DNP’s battery pouches have pristine surface materials. This was not simply for the purpose of making the products attractive in appearance. Rather, it reflects the Company’s priority on safety—the materials encasing the battery’s toxic substances are carefully inspected for even the slightest flaws. Consequently, these products have earned an excellent reputation among customers.

Promoting Environmentally Friendly Electric Vehicles to Solve Social Issues

DNP’s battery pouches are also used to encase the lithium-ion batteries installed in electric vehicles. When it first started developing battery pouches, DNP had already envisioned their eventual application in electric vehicles.

DNP is striving to make further advances in this technology to contribute to the goals of decreasing the weight of lithium-ion batteries and increasing their energy density. Attaining those goals would increase the mileage and operating range of electric vehicles, which would make them more popular with consumers in the future. Accordingly, DNP hopes that its technological innovations will contribute to environmental initiatives that protect the planet.

Printing Technology’s Strength