Introduction
Polyester staple fiber quality is mainly evaluated by its mechanical performance. Among the most important indicators are:Breaking strength (tenacity) Breaking elongation CV of tenacity at break.
These parameters directly affect processing stability and final product performance in applications such as spunlace, nonwoven, and filling materials.
Breaking Strength (Tenacity at Break)
Definition:Breaking strength (tenacity) measures the maximum force a fiber can withstand before breaking, expressed in cN/dtex.
Meaning:Indicates fiber durability and load-bearing ability
Higher values = stronger fiber
Importance in production:
Affects fiber resistance during opening and carding Influences final fabric strength
Breaking Elongation
Definition:
Breaking elongation is the percentage that a fiber can stretch before breaking.
Meaning:Indicates flexibility and elasticity of fiber
Higher elongation = softer and more flexible fiber
Importance in production:
Affects softness and hand feel Influences fiber processing behavior (carding, web formation)
CV of Tenacity at Break
Definition:CV (Coefficient of Variation) of tenacity at break measures the variation of fiber strength between individual fibers.
Meaning:Indicates uniformity and consistency of fiber quality
Lower CV = more stable and uniform fiber
Importance in production:Ensures stable processing performance Reduces fiber breakage and defects Improves consistency of nonwoven or filling products
How These Three Properties Work Together
These three indicators must be evaluated together:
Application Impact
Spunlace nonwoven:needs stable CV + moderate strength
Filling / padding:needs high elongation + softness
Industrial use:needs higher strength + stability
Conclusion
These three parameters together define the real performance of polyester staple fiber.
Understanding them helps buyers select the right fiber for different applications and ensures stable production results.