Basic R&D for Carbon Fiber Innovation



■Development of energy-saving and highly productive Carbon Fibers manufacturing process

Establish a basic technology aiming for an innovative Carbon Fibers manufacturing process that is energy-saving and highly productive, by renewing the existing Carbon Fibers manufacturing method, in which acrylic fiber is flame-resistant at several hundred degrees in air and then carbonized (calcined) at high temperature in nitrogen.

Through technological development so far, we have succeeded in synthesizing a solvent-soluble flame resistant polymer for the first time in the world. At the same time, in the carbonization technology using microwaves, high-speed carbonization in seconds, which is a characteristic of direct heating, has also been realized in large-definition (large tow) precursor fibers.

In the future, we aim to complete industrialized process technology with large tow (48K), aiming at performance that exceeds single fiber diameter 7μm, elastic modulus 240GPa, strength 4GPa as an innovative Carbon Fibers.


Development of "Innovative Carbon Fibers Manufacturing Process" to meet the large demand for Carbon Fibers

The current Carbon Fibers manufacturing method making acrylic fibers flame resistant in high-temperature air will be renewed, and the basic technology of the "innovative Carbon Fibers manufacturing process" that is energy-saving and highly productive will be established.

The key is the new precursor polymer fibers that does not require flame resistance and the carbonization technology using microwave energy. By realizing these technologies, we aim to industrialize a manufacturing process that is 10 times more productive and halves CO2 emissions.

[Research results so far]

・Development of new Carbon Fibers precursor compounds

We succeeded in synthesizing a solvent-soluble flame-resistant polymer for the first time in the world, and established the basic technology of 6K filament for spinning.

Regarding the physical properties of Carbon Fibers, an elastic modulus of 240 GPa and an elongation of 1. 5% were achieved with a single yarn diameter of 5 μm.

・Development of carbonization process technology using microwaves

High-speed carbonization in seconds, which is a characteristic of direct heating by microwaves, has also been realized in large fineness (large tow) precursor fibers. In order to obtain stable Quality Carbon Fibers with large tow (48K), we are elucidating the correlation between the formation process of Carbon Fibers order accompanying carbonization and mechanical properties. So far, we have found a new method for quantitatively and precisely evaluating differences in microwave irradiation conditions, Fibers heating mechanisms, and structural changes, and have developed basic technologies for achieving stable carbonization.


National Institute of Advanced Industrial Science and Technology

Toray Co., Ltd.

Teijin Limited

Supplementary information

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