Mechanical Property
Resistance of fibre assemblies to axial loads determines the bulkiness and resilience of high-loft insulation and upholstery materials. Longitudinal compression force is the mechanical load experienced by a single fibre or yarn when it is squeezed along its major axis. This physical property is directly related to the natural crimp and structural stiffness of the textile material.
Fibres with high natural crimp withstand greater axial loads before buckling, which helps the fabric maintain its original loft.
Crimp Behavior
Buckling occurs when the applied load exceeds the elastic limit of the yarn structure. After buckling, the fibre deforms laterally, which absorbs energy and creates a spring-like action. This transition is critical for designing high-performance outerwear filled with wool or synthetic batting.
Industrial Testing
Specialized texture testers measure this resistance by compressing a standard volume of wool fibres in a cylindrical chamber. The instrument records the force required to reach a specific compression ratio. A high longitudinal compression force indicates a resilient wool batch that is suited for carpet manufacturing.
Material Limit
Moisture absorption decreases the rigidity of keratin fibres. As a result, wet fibres show a much lower compression resistance. This soft behavior limits dry-state bulk retention.
