What are the special requirements (such as fluffiness and anti caking) that need to be met when using recycled polyester short fibers for home textile filling (such as quilts and pillows)? ​

Recycled polyester staple fiberFor home textile filling, the core requirements are to balance "comfort experience+durability+safety and environmental protection", and the key indicators need to meet core performance such as fluffiness and anti caking, while also complying with safety and environmental standards.

1. Core physical performance requirements

Fluffiness: After filling, it needs to have good rebound. The national standard usually requires a compression rebound rate of ≥ 70% to ensure that the core and pillow are fluffy and not collapsed, providing sufficient insulation space.

Anti caking property: After multiple washings (simulating 10-20 household washings), the fibers remain dispersed without clumping or clumping, and need to be controlled by fiber curl (curl number ≥ 10/25mm) and elastic modulus.

Length and linear density: The recommended fiber length is 38-65mm, and the linear density is 1.5-3.3dtex. If it is too short, it is easy to fall off, and if it is too long, it is easy to entangle, which affects the uniformity of filling.

Breaking strength and elongation: Breaking strength ≥ 3.0cN/dtex, breaking elongation 25% -40%, avoid use during usefiberFracture leads to filling failure.

2. Safety and environmental requirements

Limit of harmful substances: meets the requirements of GB 18401 (Textile Safety Standard) Class B, formaldehyde content ≤ 75mg/kg, pH value 4.0-8.5, no odor, no fluorescent whitening agent (can be selected as needed).

Environmental compliance: Recycled raw materials must meet the requirements for recycling traceability (such as GRS certification), and the use of medical waste and polluting recycled materials is prohibited. The content of heavy metals (lead, cadmium, etc.) must comply with the OEKO-TEX Standard 100 standard.

Flame retardant performance: If used for home textiles in hotels and public settings, it must meet the requirements of GB 8624 flame retardant level B1, and can be improved as needed for household scenarios.

3. Application adaptation requirements

Uniformity: When filling, the fibers are evenly dispersed without local thickness differences, avoiding the occurrence of "clumping and bulging" that affects the user experience.

Anti pilling and detachment: The fiber surface needs to undergo anti-static and anti pilling treatment to avoid pilling or detachment from fabric pores during use. It must pass the Martindale pilling test at least level 3.

Washability: After multiple water washes (at a temperature of 40 ℃), the performance deteriorates by ≤ 15% without significant shrinkage or deformation, and the color fastness (washability and sweat resistance) is ≥ 3-4 levels.

4. Additional performance requirements

Warmth: Thermal conductivity ≤ 0.040 W/(m · K), when combined with natural fibers (such as cotton), it is necessary to maintain a synergistic warmth retention effect.

Breathability: Ensure air circulation in the filling layer to avoid stuffiness, with a breathability of ≥ 50 L/(m ² · s).

Hygiene: It needs to have certain antibacterial properties (optional, such as adding silver ion antibacterial agents), inhibit the growth of mold and bacteria, and comply with the GB/T 20944 antibacterial standard.