Teijin Showcases Ultra-light Electric Concept Car (page 2)

Apr 1, 2010
Motohiko Hamada, Nikkei Automotive Technology & Tsunenori Tomioka, Nikkei Monozukuri & Tatsuhiko Hayashi, Nikkei Automotive Technology

Reducing weight of body

The weight of the body was reduced by employing the core structure design of carbon composite material. The core structure is made by sandwiching a pre-formed urethane foam material between prepreg sheets and pressing them with heat to integrate them.

With the method, it is possible to enhance the rigidity of even a thin carbon fiber sheet. The shape forming was conducted at GH Craft Ltd, an affiliate company of Teijin.

Other materials, parts used for PU_PA EV

The interior materials for the sheets and mats are made with a biodegradable polyethylene terephthalate (PET), which contains fibers made from plant-derived ethylene glycol (30% by mass).

Also, Teijin used the "Teflex," a metallic film that eliminates the need for plating, so that a laser radar device, etc can be placed behind a metallic ornament. Though the film is coated with silver color and looks like aluminum, it actually is made of resin. It was employed for a suitcase of the Zero Halliburton brand.

As a code for the peripheries of tires (radial direction), Teijin used the "Teonex" PEN (polyethylene naphthalate) fiber to reduce road noise. The Teonex has already been employed for Bridgestone Corp's Regno GR9000 and Sumitomo Rubber Industries Ltd's Veuro VE302, which are tires developed in the aim of reducing noise.

Furthermore, the company used the "Cell Form" two-dimensional communication sheet, which enables multiple devices to wirelessly communicate with one another. It is made by arraying conductive fibers in a reticular pattern between two PEN sheets. With the sheet, electric devices such as a car navigation system can be placed anywhere on the dashboard.

Correction Notice: We replaced the sentence, "the heat-absorbing polycarbonate resin that is used for its windows ... can fly apart if it is broken," in the fourth paragraph with the sentence, "the heat-absorbing polycarbonate resin that is used for its windows ... cannot be used for the front window."