Injection Molding Technology


Injection Molding Technology

We have a wide variety of molding methods, and by selecting the most suitable method for the application of our customers’ products (e.g., automobiles, electrical products, amusement field, etc.), we are able to achieve fine precision and beautiful finishes.

Forming Method

Heat & Cool Molding

This is a molding method in which the surface temperature of the mold cavity is heated to around the heat deformation temperature of the resin used, and then the resin is injected and rapidly cooled to the temperature range where it can be removed.

(1) Because the mold surface temperature is high, the transferability of the mirror surface and emboss etc. of the mold is improved.
(2) Due to the delayed solidification of the skin layer, the weld strength is improved compared to general molding, and the weld becomes less visible.

  • General molding
    (Weld lines can be seen around the hole)
  • Heat & Cool molding


1.Better transferability of mold surface (e.g. mirror polish, textures) because of higher mold surface temperature than general injection molding.


2.Weld strength can be improved, and the weld-line is less visible because solidification of skin layer is slower than general injection molding.


Molding Process

1. steam is used to rapidly heat the mold cavity to the appropriate temperature.
2. inject the resin into the mold.
3. chiller rapidly cools the mold cavity.
4. remove the product after the resin temperature has dropped sufficiently.

Compression Molding

Compression molding is a method of molding in which a melted material is placed into a slightly opened mold cavity. After filling up the material, the mold is then closed and compressed to reach a designated wall-thickness.


·Reduces residual strain (realizes low retardation by optical strain)
·Improves sink marks

  • Retardation – General injection molding

    Largely distorted and non-uniform
  • Retardation – Compression molding

    Distortion is improved.
  • 1)Before injection

    Keep the mold slightly opened.
  • 2)Injection

    Distortion is improved.
  • 3)Compression

    By compressing, polymers decrease in volume and filling process then completes.
  • 4)Cooling & Ejection

    After cooling, eject the molded part.


This is a molding method in which a pre-decorated film is sandwiched between two injection molds and injection molded to transfer the decoration to the resin by the heat of the resin.

*The combination of printing, metal deposition, hard coating, etc. makes it possible to achieve a variety of decorations in a single injection molding.


Molding Process

Multiple Color Injection Molding

By combining multiple parts and reducing the number of parts through multi-color molding, we are able to reduce the number of processes and increase the degree of freedom in design, thereby enabling a wide variety of decorative designs.

*The photo on the right shows an example of multi-color molding (three-color molding) of an in-vehicle meter panel. The photo on the right shows an example of multi-color molding (three-color molding) of an in-vehicle meter panel. In this part, the memory part (transparent resin and red resin) that transmits light is molded simultaneously in the primary and secondary molding, and the body that holds the memory is molded in plating grade resin in the tertiary molding.
In the past, this would require the assembly of multiple fixtures and printing to color the memory, but now it is possible to create a compact molded product with the same functions in a single molding process.

Molding Process

Film Insert Molding (IML)

This is a molding method in which a function-loaded film or a pre-printed film is placed in a mold and injection molded to integrate with the film.

*Since the film is the outermost layer, the durability of printing on the inside of the film is excellent.

*It is possible to decorate shapes with depths that cannot be handled by In-mold.

Molding Process

Metal Insert Molding

We have experience of metal insert molding for a wide range of business field, for example OA equipment, mobiles and automotive parts.
Our production system is capable of automatic insertion by multi-axis robots, which contributes a customer’s satisfaction in quality, cost and delivery.