Composite technology is a combination of wet and dry coating technology. This combination enables the addition of different functions, including designability, durability, barrier characteristics, and adhesiveness. Our composite technology adds new value to existing products to fulfill the needs of a wide spectrum of industries.
Hot stamping foil, for example, can create the sparkling alphanumeric characters and patterns for cosmetics packages and the logos for magazine covers. This hot stamping foil uses composite technology. Wet coating and dry coating a base film can create compound functional layers of all types and metal deposition layers. This enables the transfer to plastics, paper, coated paper, and cloth. In addition to having a decorative function, it also adds such functions as post printing, oil resistance, and resistance to washing as required. There is also transparent functional hot stamping foil for protecting architectural material from damage, and deterioration from ultraviolet rays.
The Nakai group uses the dry laminating method. With dry laminating, the base material is first coated with adhesive, and then the solvent is removed in a drying furnace. Finally, another film is affixed by heat and pressure using a laminate roll. This enables different base materials to be coated and then stuck together. The primary characteristic of this method is that it creates a compound film not obtained from coating.
The capabilities of our technicians are demonstrated by how the wet coating and the dry coating is combined and layered to create uniform quality for the entire film.
One example every Japanese person will be immediately familiar with is the chopstick packages used for the New Year’s holidays. They usually have the character for “long life” written on them in gold. That comes from the hot stamping foil mentioned above. The process used to make this hot stamping foil prepares PET film, functional layers, and metallic deposition layers.
Of these layers, the dry coating technology is used for the deposition layer so that metals such as aluminum and metal oxides are layered in a depressurized environment (vacuums). For the other layers, wet coating technology is used to apply coatings with different functions. In this mechanism, when a convex mold on which the character for “long life” is written is applied to the foil using heat and pressure, only the gold letter of the character is transferred.
We create many products for different uses by adding the functions sought by our customers to these films — items of high reflectivity, protective items, items resistant to static electricity buildup, items that prevent the corrosion of metal, and others. Nakai’s greatest strength is using the combination of the wet coating and dry coating technologies to add more advanced functions.
In the future, we intend to move in the direction of greater lightness and flexibility for products in every sector, starting with the most advanced electronic products. We’re proud of our exceptional technical capabilities to produce thin film coatings, and we will strive to further expand our potential for creating new business opportunities.