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Functional Oyster Shell Composite Fiber

[Category : - Wearing apparel]
[Viewed 58 times]

This novel invention (TWM675224U) relates to a recycled polyester composite fiber structure with a shell powder dispersed phase. It is characterized by comprising a recycled polyethylene terephthalate (r-PET) fiber matrix with a special cross-section, containing 5–30 wt% of calcined natural shell powder particles (e.g., oyster shell powder, with a particle size of 2–8 ?m). These particles are surface-modified to be uniformly and discontinuously dispersed within the fiber, with some exposed on the fiber surface to form a micron-scale roughness structure. Its cross-section has a Y-shaped, trilobal, or other special-shaped design, and can further include hollow micropores to enhance breathability and functional surface area. Through this structural design, the novel invention combines excellent deodorizing, antibacterial, moisture-absorbing, and spinnability properties, making it suitable for the development of functional and sustainable textile materials.

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This invention is positioned within the global transition toward a circular economy, carbon reduction, and high-value sustainable textiles. The textile and materials industries are under increasing regulatory and market pressure to reduce dependence on virgin petrochemical resources while simultaneously delivering enhanced functional performance. Recycled polyethylene terephthalate (r-PET) has become a core material in this transition; however, conventional r-PET fibers often suffer from limited functionality and reduced value differentiation.

The disclosed technology upgrades low-cost recycled polyester by integrating calcined natural shell powder (a recycled marine by-product) as a functional inorganic dispersed phase. This approach creates dual economic value:

Upcycling waste streams (discarded shells and post-consumer PET) into higher-margin functional materials, and

Replacing imported or synthetic functional additives (such as silver-based antibacterials, activated carbon, or specialty minerals) with locally sourced, mineral-based alternatives.

From a cost structure perspective, shell powder is abundant, inexpensive, and price-stable, reducing raw material volatility compared with petroleum-derived or precious-metal additives. The process is compatible with existing melt-spinning and masterbatch infrastructure, requiring no radical capital reinvestment, which lowers adoption barriers for fiber manufacturers and accelerates commercialization.

Market demand for odor-control, antibacterial, moisture-management, and air-purifying textiles is expanding rapidly in applications such as apparel, home textiles, medical textiles, filtration media, and interior materials. By embedding these functions directly into the fiber structure rather than relying on surface coatings, the invention improves durability, wash resistance, and lifecycle cost efficiency, strengthening its economic competitiveness.

In addition, the technology aligns with ESG, green procurement, and extended producer responsibility (EPR) policies increasingly adopted by global brands and governments. Products incorporating this fiber can qualify for sustainability labeling, recycled-content certification, and environmental subsidies, further enhancing market acceptance and pricing power.

Overall, this invention transforms recycled materials into a scalable, differentiated, and regulation-aligned functional fiber platform, supporting industrial upgrading, waste reduction, and long-term economic resilience in the textile and materials sectors.

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polochung (Taiwan)

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