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Dry coating

Advanced technology to promote the evolution of nanotechnology and meet the needs for thinner and lighter products

What is dry coating technology?

Dry coating is a method of affixing metals and oxide products on PET films and other base films. It is characterized by the ability to allow precise layering of extremely thin films measured in nanometers.

  • Vacuum deposition

    In this technology, the vaporized material of metals and oxide products are heated in a vacuum, and the metal particles converted into a gas are adhered to the surface of the base film. To visualize the process, think of a cup of hot water covered with plastic wrap and the phenomenon of the moisture adhering to the plastic wrap. (The hot water is the vaporized material, and the wrap is the base film.)
    It is possible to add a variety of functions depending on the type and thickness of the metal, including designability, conductivity, shielding capacity, and gas barrier characteristics. The products are used in a wide range of sectors. This process also has the advantage of being cheaper than sputtering.

Typical products made using dry coating technology

  • Metallic yarn

    The metallic yarn used for obi belts made with Nishijin brocade is made by weaving the film created by combining film with aluminum, gold, and silver into the thread.

  • Packaging (Bags of confections and other products)

    This can provide moisture prevention and light blocking properties by creating films from aluminum and other metals.

  • Electronic parts

    Dry coating technology is utilized for shield films for electronic equipment.

  • Reflective material (Mirrors, etc.)

    Creating a film out of silver or other highly reflective metals enables the production of light, sturdy mirrors and reflective films for liquid crystal displays.

Here’s a more specific explanation of dry coating technology.

Dry coating is a method suited for adhering metals to film. Its primary feature is the capacity to incorporate the characteristics of individual metals.

The first characteristic of metals is their shiny, metallic luster. That luster can be employed to add design characteristics and decorations. Examples of use include metallic yarns, films for advertising, packaging material, and the surfaces of electrical products.

The second characteristic is that they conduct electricity. This capability differs with the type of metal, but when a high degree of conductivity is required, metals such as silver and copper, with a high electric conductivity ratio, are made into films.

The third characteristic is reflectivity. Using the luster of metals enables light rays to be reflected. The degree of luster differs according to the type of metal, so they are differentiated by use.
Aluminum is acceptable for use with ordinary mirrors, but highly reflective metals such as silver are selected when a very high degree of reflectivity is required, such as for the reflective films for liquid crystal displays.

Dry coating is used in different sectors in these ways, but in fact, few products use dry coating only. Most products are composites that use both dry coating and wet coating. The Nakai Group has plants specializing exclusively in dry coating, wet coating, and composites, so we have created products for a wide range of sectors by blending these technologies.

As the needs increase in the future for thinner and lighter electronic products and other products in the high tech sector, our role as an all-round manufacturer of thin film coatings will likely grow. As part of that process, we hope to further develop dry coating, which enables the creation of thin films at the nano-level, to become our core technology.

Ask here about our dry coating technology.

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