NEWS RELEASE

Teijin Frontier Develops ”OctaⓇ sf” Spun Yarn Offering
Exceptional Softness, Fluffy, Comfort to wear & Functionality
Tokyo, Japan, June 6, 2024 --- Teijin Frontier Co., Ltd., the Teijin Group’s fibers and products
converting company, today announced the development of ” OctaⓇsf“, a polyester spun yarnthat provides a soft, gentle feel, fluffiness, light weight, moisture absorption and heatretention for textiles used in sportswear and outerwear. To create this novel spun yarn,
Teijin Frontier developed an ultra-fine staple fiber with a hollow, 8-fin modified cross-section,
which the company processes using special spinning and drawing technologies. ”OctaⓇsf“overcomes softness limitations of existing staple fiber made of filament yarn modified, andaddresses demands for new materials that combine high performance with desirable tactile
feel.
The gaps created by the fiber’s 8-fin modified cross-section, combined with the softness ofthe extremely fine-spun yarn, provide a gentle feel a natural fullness and warmth. ”OctaⓇsf“yarn also delivers practical functionality such as water absorption and diffusion, thanks toits eight hollow fins; bulkiness and lightness due to the gaps between the fibers; and heatretention resulting from the presence of dead air. Furthermore, the modified cross-sectional
shape of the staple fibers and large gaps between them make it easy to blend them withother natural fibers, such as wool, as well as with synthetic fibers, such as lyocell. It can also
be combined with polyester functional materials made by Teijin Frontier, allowing customers
to develop a wide variety of textiles.

Cross-section of ultra-fine modified(hollow 8-fin) raw cotton

Cross-section of “Octa Ⓡ sf” blendedyarn (electron microscope photo)

Teijin Frontier is currently developing special structure fabrics that utilize “Octa” yarn,
primarily for outerwear and mid-layer applications. In addition, the company is developing
related materials for base layers and innerwear, which require a softer, more comfortabletexture compared to outerwear.
With existing filament yarn with modified cross-section yarns, there are limitations to the soft
texture that can be achieved due to the thickness of each single yarn and the cross-sectional
shape of the raw yarn. Therefore, Teijin Frontier began developing an ultra-fine staple fiberwith a hollow 8-fin cross-section and a spun yarn using this. Until now, it has been difficult todevelop ultra-fine staple fiber that maintains a hollow 8-fin cross-sectional shape, but Teijin
Frontier has succeeded in developing ultra-fine staple fiber with a hollow 8-fin cross-section
by using its own special spinning and drawing technology. Furthermore, by applying ourunique spinning technology to this staple fiber, we have been able to develop "OctaⓇ sf," anextremely fine hollow 8-fin modified cross-section spun yarn that combines a fluffy, soft
texture, comfort to wear, and functionality.
Technology overview
The ”OctaⓇsf ” yarn leverages advanced technologies and processes. In staple fiber
production, the company uses a special spinneret design to achieve ultra-fine fibers withmodified cross-sections. Also, Teijin Frontier’s production process optimizes the crimp
characteristics, oils and cut length of staple fiber. In the spinning stage, special technology
improves the blend of polyester staple fiber and other fibers, as well as the carding
conditions, to enhance the quality of the yarn.
Knitting structure and density settings for textiles using “OctaⓇsf“ yarn are adjusted basedon the application requirements. Optimizing dyeing and processing technology to achieve
high-quality color and functionality.
Teijin Frontier will begin selling textiles made from “OctaⓇsf” yarn for outdoor wear andsportswear in the fall/winter of 2025. Subsequently, the company will expand the use of thematerial into other applications such as fashion apparel, aiming for sales of 100,000 meter infiscal 2025 and 500,000 meter by fiscal 2028.

About the Teijin GroupTeijin (TSE: 3401) is a technology-driven global group with two core businesses: highperformance materials and healthcare solutions. Established in 1918 as Japan’s first rayon
manufacturer, Teijin today comprises some 170 companies employing 20,000 people in
20 countries. Through “Human Chemistry, Human Solutions,” Teijin relentlessly strives toaims to be a company that supports the society of the future by protecting the global
environment and addressing the needs of people and communities. Teijin posted

consolidated sales of JPY 1,032.8 billion (USD 6.6 billion) and total assets of JPY 1,251.0billion (USD 8.0 billion) in the fiscal year ending March 31, 2024.
Press Contact
Corporate Communication Department
Teijin Limited
pr@teijin.co.jp