Cover Factor Calculation Impact on Fluid Penetration Rates in Woven Fabrics
Accurate cover factor calculation defines interthread pore hydraulic radius, predicting hydrostatic penetration pressure and capillary wicking velocity in woven barriers.
Yarn Flattening Coefficient
Cross Sectional Deformation
Ratios that describe the change in the cross-sectional shape of a yarn from a circle to an ellipse when it is interlaced into a fabric influence the thickness and opacity of the cloth. The yarn flattening coefficient measures the degree of deformation caused by the pressure of the intersecting yarns. It is a fundamental factor in predicting the cover factor and the surface smoothness of a textile.
Weave Compression Effect
Mechanical forces during interlacing and finishing squeeze the soft yarn structures at every contact point. As the yarn flattening coefficient increases, the width of the yarn increases while its height decreases. This spread fills the gaps between the yarns more effectively.
Analytical Measurement
Analysis of the fabric under a microscope allows for the measurement of the major and minor axes of the compressed yarn. The yarn flattening coefficient is calculated by dividing the width of the yarn in the fabric by its original diameter. Results vary depending on the twist level of the yarn and the density of the interlacing.
Soft-spun yarns exhibit more deformation than high-twist variants.
Fabric Property Impact
Industrial designers use this value to calculate the exact amount of raw material needed to achieve a specific fabric weight. A high yarn flattening coefficient results in a thinner fabric with better coverage and a smoother hand. Precise knowledge of this deformation helps mills produce consistent high-quality textiles for the fashion industry.