1. Mechanical Properties and Application Scenarios of Common Fibers The durability, hand feel, and appearance retention of sofa fabrics fundamentally depend on the mechanical properties of the fibers. In terms of breaking strength, polyester is significantly stronger than acrylic. Acrylic has a strength of 17.6–30.8 cN/tex, lower than both polyester and nylon, but its elongation at break is 25%–46%, comparable to polyester and nylon, giving the fabric good extensibility. Regarding elastic recovery, acrylic has good elasticity, second only to polyester and about twice that of nylon, providing good shape retention. This means that in sofa fabrics where wrinkle resistance and dimensional stability are core requirements, polyester contributes more prominently. From the perspective of light resistance, acrylic is the best among all synthetic fibers, with strength decreasing by only about 20% after one year of outdoor exposure. Polyester is second only to acrylic in light resistance, with a strength retention of 60%–70% after 1000 hours of exposure. This difference directly determines the suitability of fabrics for areas near windows or exposed to direct sunlight. In terms of heat resistance, both polyester and acrylic are excellent, making them suitable for tropical and high-temperature environments. However, it should be noted that polyester has very poor moisture absorption and poor electrical conductivity. Pure polyester fabrics are prone to static electricity and dust accumulation. This deficiency needs to be compensated for through blending or finishing. 2. Engineering Logic of Blending Ratios Pure fiber fabrics cannot simultaneously meet multi-dimensional requirements such as abrasion resistance, comfort, and antistatic properties. Blending is a core method in sofa fabric engineering. The typical blending approach for cotton-polyester blends is: cotton provides a soft feel and moisture absorption/breathability, while polyester provides abrasion resistance and wrinkle resistance/shape retention. In actual production, the ratio of cotton to polyester needs to be adjusted according to the target weight and hand feel requirements. A high cotton ratio (≥50%) yields a more natural feel, but abrasion resistance and dimensional stability decrease; a high polyester ratio (≥65%) significantly improves abrasion resistance, but the hand feel and breathability become stiffer. For scenarios with high antistatic requirements, functional fibers can be blended. For example, blending 28 tex polyester/combed cotton/polyester-based carbon black antistatic fiber in a ratio of 65/34.65/0.35 can achieve excellent antistatic performance while retaining the basic mechanical properties of cotton-polyester blends. 3. Fiber Strategy for Chenille and Pile Fabrics Chenille yarn, with its unique pile structure and plush feel, is widely used in mid-to-high-end sofa fabrics. In high-elasticity, wrinkle-resistant jacquard sofa fabrics, the wear-resistant layer is interwoven with polyester yarn as the warp and chenille yarn as the weft, utilizing the strength of polyester and the pile feel of chenille to achieve a balance between abrasion resistance and aesthetics. In pile fabrics, pile retention rate is a core technical indicator. Warp-knitted double-needle-bed pile fabrics need to be tested for surface wear cycles using a Martindale abrasion tester to ensure the pile does not shed, with the standard referring to GB/T 21196.3. 4. Decision Framework for Fiber Selection Based on the above analysis, the fiber selection for sofa fabrics can follow this framework: For high-frequency household use, prioritize a blending system with polyester content ≥60% to ensure abrasion resistance and shape retention; for commercial scenarios (hotels, offices), further increase the polyester ratio or introduce high-performance fibers; for environments with direct sunlight, ensure the light resistance advantages of acrylic or polyester are utilized; for humid climates, choose polypropylene, polyester, or vinylon systems with low moisture absorption to avoid mildew and dimensional changes.