Starting with bookbinding and processing of paper products and moving on to film packaging, plastic forming and aseptic bottle filling systems, DNP has developed one post-printing processing technology after another. We have also acquired advanced technologies through testing, measuring, and analyzing a variety of products.

Aseptic Filling


DNP has developed aseptic systems for filling sterilized packaging materials with food or beverages in a sterile environment, thereby contributing to improving food safety and decreasing the burden placed by packaging materials on the environment. In addition to food preservation and sterilization technologies, we make use of a wide variety of technologies in the development of these systems, including filling machinery design, control, sensing technologies, and packaging materials design technologies.


Aseptic filling systems

DNP’s aseptic filling systems can be adapted for various packaging formats and filling volumes and can be used for high-quality filling. One aseptic filling system for pasta sauce, noodle broth or other liquid foods can be used to fill any amount from 10ml to 1,000mL; in other words, it can manufacture anything from a single-portion package to a commercial use product. Furthermore, DNP’s system allows the supply of products that were difficult to process by conventional retort methods because those methods required heating for longer time periods, which tended to break down the contents. Because DNP’s aseptic PET plastic bottle filling systems enable filling at room temperature, unlike conventional systems that required filling at high temperatures, it is possible to use lighter, thinner bottles that are good for reducing the burden placed on the environment.


Assessment and Analysis Technologies


Assessment and analysis technologies are indispensable to strengthening and developing manufacturing in today’s changing market environment. In our product development, DNP combines the latest analysis and measuring equipment and theories, identifies materials that can form product value, and explicates the mechanisms by which those materials express their functionality. We bring visualizing and sensing technologies into each factory and analyze its production processes in order to stabilize quality and boost productivity. We endeavor to improve working environments so as to add further protection to workers and solve all types of problems that arise on the factory floor.


Analyzing breaking strength based on drop test of packaging cup

The market wants packaging cups made of thinner resin in order to minimize weight and cost, but without sacrificing strength. In conventional strength testing, cups are actually dropped and their strength is evaluated based on observation of broken cups, but by this method it is difficult to determine the specific point at which breakage was triggered. Therefore, we began using a high-speed camera to enable detailed analysis of breakdown behavior. By capturing the breaking point, we were able to select the most suitable resin and design optimal manufacturing processes.


Machinery and Equipment Design Technologies


Some of DNP’s equipment requires a high level of precision and quality that existing equipment manufacturers cannot provide. In addition to making use of mechatronics, for the past 20 years DNP has been using structural analysis technologies in its design processes rather than relying exclusively on the experience and intuition of veteran designers. Moreover, we continually work to make our equipment more reliable based on vibration analysis and equipment maintenance information generated in house.


Printer frame deformation analyzer

Because the printers that make books, packaging materials and other products have precision-processed cylindrical plates that rotate with a high degree of precision, they must be assembled to a highly accurate margin of error of less than 50μm. Also, because the paper or other print stock that gets pushed onto the plate can weigh more than 500kg, it is important that the machine be designed to prevent deformation of its frame and reduce resulting effects on printed matter. DNP uses a scaled-down model for experimentation as well as strength and vibration analysis in order to predict characteristic number of vibrations and amount of frame deformation.