rPET/PTT Double-hollow Composite Elastic Fiber

2025-03-18News 6900

Reasons for recommendation

The combination of recycling and bio-based material is low-carbon

and environmentally friendly, fitting seamlessly into sustainable

development. The innovative “8”-shaped double-hollow component

composite imparts lightweight, thermal-retention, comfort, and

elasticity properties, etc., to the fabric, ensuring excellent conformality

of the product.

Preparative technique

With rPET and bio-based PTT as raw materials, the optimal rPET/PTT compound system has been optimized. Asymmetric and multi-dimensional deformed side-by-side composite spinneret assemblies are adopted to produce the fiber through melt composite spinning process.

Features of fibers and finished products

Filament: 56dtex/24f, 84dtex/32f, 111dtex/48f FDY

Polytrimethylene terephthalate/polyethylene terephthalate (PTT/PET) composite drawn yarn (FZ/T 54094一2017)

Properties of fibers and features of finished products

.Combination of recycling and bio-based materials.

·8-shaped hollow structure, low density, light weight.

.Long-lasting elasticity, excellent rebound resilience, ability to recover quickly.

.Excellent thermal-retention property and good air permeability.

Performance indexes of rpet/ptt double-hollow composite elastic fiber

Specification	Breaking tenacity(cN/dtex)	Elongation at break (%)	Boiling water shrink age rate(%)	Dry-thermal curling elongation(%)		Dry-thermal shrinkage(%)	Dry-thermal curling shrinkage (%)		Heat retention rate (%)
84dtex/32f	3.34	32.6	8.6	72.4		6.0	42.3		1.3
Fabric composition			Heat retention rate (%)		Heat transfer coefficient [W/(m2.℃ )]			Clo value(clo)
50% rPET/PTT double-hollow composite elastic fiber/ 50% conventional dacron			11.94		73.28			0.09

The downstream application guidance

Weaving: Can be interwoven with other fibers to produce both knitted and woven fabrics.

Dyeing and finishing: Use dispersive dyes. The gray fabric needs to be pre-shrunk and pre-set before dyeing. The recommended dyeing temperature is 125℃.

Application of fibers

Clothing textiles：Leisure wear/Sportswear/Down jacket/High-end ready-to-wear

Home textiles：Carpet/Sofa fabric

Industrial textiles：Outdoor product

Q: Why does the 8-shaped hollow structure design have more advantages compared to single-hole hollow fiber and conventional two-component elastic fiber?

A:Compared to single-hole hollow fiber, the 8-shaped hollow structure design exhibits superior performance in terms of thermal insulation and rebound resilience. The double-hollow structure distributes the supporting force evenly,enhancing the cohesive force and thermal-retention properties of the fiber, and increasing the bending modulus of the fiber effectively. While compared to conventional two-component elastic fiber, the fiber with an 8-shaped hollow

structure possesses more prominent three-dimensional effects and fluffiness.Furthermore, this fiber integrates bio-based materials with recycled materials,achieving a perfect combination of greenness, low-carbon, and environmental protection, and fitting into sustainable development.