Air Jet Spun Yarn Mechanics in Elastic Woven Fabrics
Air jet core-spun yarns deliver torque-free, pill-resistant elastic wovens by locking polyurethane filaments inside parallel staple cores bound by vortex wrappers.
Tensionless Wet Relaxation
Fabric Dimensionality
Dimensional stabilisation within a textile environment occurs when the tensionless wet relaxation process removes latent internal stresses from yarns and filaments. This procedure involves soaking materials in an aqueous environment to permit the fibers to return to their equilibrium state, which effectively prevents future shrinkage during garment construction or subsequent consumer laundering. The mechanical force applied during spinning, weaving, or knitting imposes significant strain on the material, which this stage mitigates before the final cut and sew phase begins.
Chemical Equilibrium
Proper submersion allows the molecular chains in synthetic and natural polymers to reorient themselves into a low energy configuration. Water molecules act as plasticizers to lower the glass transition temperature of the polymer, allowing restricted chains to slide past one another. The material reaches this neutral state when the length and width of the sample remain constant despite further exposure to heat or liquid.
Manufacturers verify this property by marking specific reference points on a test piece, measuring the distance between these points before and after the wet treatment, and calculating the resultant delta.
Industrial Verification
Production facilities implement this standard to ensure that the finished fabric meets stringent width and length specifications requested by garment manufacturers. The process functions as a calibration point where bulk material behaves according to laboratory test results rather than exhibiting unpredictable geometry changes. Successful completion of this wet treatment removes the primary risk of garment distortion caused by heat pressing or steaming during final assembly.
Accurate control of this phase preserves the integrity of patterns and reduces the waste of fabric that would otherwise fall outside of required tolerances.
Post Processing
Subsequent curing or drying steps must occur without introducing new mechanical drag or lengthwise pull, as such force reintroduces the very strain the relaxation phase intends to eliminate. The machinery operates by supporting the fabric on a conveyor belt or within a slack bath that exerts zero longitudinal stress on the moving web. If a machine fails to maintain this lack of tension, the material undergoes thermal set in a distorted state.
Precise regulation of the liquid temperature and immersion duration governs the speed at which the fabric reaches its final dimension. Proper execution of this workflow guarantees that the fabric remains stable through the lifetime of the finished product.