The comparison with the conventional technology is as follows.
(1) Hot plate and hot air welding dryer – Welding with hot plate or hot air dryer. The disadvantage is deformation of the surface.
(2) Vibration welding / ultrasonic welding – Since it is difficult to weld resins with low friction coefficients and they vibrate, it is not suitable for fine and precise jointing of electronic parts.
(3) Direct laser radiation – Superposes light-absorbing resins and radiate laser from one side. It is suitable for focused welding, but the disadvantage is that it thermally deforms because heat is concentrated on the surface like a hot plate.
(4) Laser Penetration Welding – This is a technology superposing light-penetrating resins and light-absorbing resins and radiating laser from the light-resins side.
Since heat is concentrated on the interface between the resins, the surfaces can be welded together with a clean surface.
However, this method is not suitable for joining the identical types of resins.
– There is also a method to execute laser welding by superposing the transparent resins together and putting dyes between the interfaces. However, this method requires a lot of time and cost, and the use of dyes, carbon black and adhesives bond tend to be avoided in medical applications.
– When the conventional laser penetrating welding method (using CO 2 laser) is applied to fluorine materials, harmful decomposition gas is generated due to thermal damage of the resin surface.
If this method is used, workers must wear a gas mask.

This technology can be applied to various plastic processing such as acrylic processing, fluorine processing, Teflon processing, etc.
1) Application to parts for semiconductor manufacturing equipment – Due to the chemical resistance required for parts of semiconductor manufacturing equipment, fluororesin (PFA / modified PTFE, etc.) is often used. It can be applied to chemical containers, chemical tanks / tanks, piping, pipe fittings, valves / pumps, wafer carriers, and other molded products. Welding methods using heaters and screw fitting methods can be used for jointing parts together, but there are many problems. This technology can be applied, and the optical system and heat sink can be customized according to the shape of the junction.2) Medical applications – Fluororesin is used because it requires chemical resistance like semiconductor manufacturing equipment parts. Ultrasonic welders are used in syringes (syringes and plastic needles) and infusion packs, but there is a problem of dust during processing. In addition, since the catheter and tube connections are microscopic, laser local welding is suitable, but the use of dyes, carbon black, and adhesives poses a hygienic problem.
This technology does not require these additives and is clean, therefore, it is suitable for medical applications.

3) Application to automotive parts – Currently, plastic of around 8 to 10% vs total weigh is used for automobiles, so weight is reduced.Engineering plastics are attracting attention in terms of their durability needs.
For example, engineering plastics such as PC are used on the body shell to resist the heat generated during painting. In addition, the use of PP has been increasing as a means of reducing weight.

4) Applications in the electrical machinery field – Electronic devices such as printed circuit boards and smartphones are required to be small, light, highly functional, heat-resistant, and robust against external shocks, and the demand for lightweight and highly functional engineering plastics is increasing rapidly.
Transparent resins such as PC are used for optical components. This method can be used for laser welding of “contamination free, solvent free, and general purpose” in the assembly of these components. Also, since this is a precision instrument, it is possible to take advantage of the features of this technology when problems occur with ultrasonic welding machines that generate dust and mechanical vibrations.