The Effect Of Structural Parameters On The Wicking Properties Of Polypropylene Yarns And Fabrics

The capillary pores between fibers are the main body to determine the moisture permeability of fiber materials,and have an important influence on the wet comfort of textile fabrics.This issue studies the relationship between micro capillary structure of yarn and fabric with hydraulic performance through the theoretical model and numerical simulation method,which reveals that the interaction of yarn twist,monofilament fineness have effects on the of moisture transfer behavior.Based on the structure characteristic of the yarn wicking pores,the Darcy’s law and the capillary pressure equation,a mathematical model of two-dimensional N pipe joints is established,and the wicking time equation of N-section 2D tu’be is derived.So the corresponding wicking time curves of N-section 2D tubes of different twisting degree and different monofilament fineness of filament yarn structure parameters.The results show that wicking speed of low twist yarn is faster than the high twist yarn and the wicking height of low twist yarn is higher under the condition of the same monofilament fineness;the wicking speed of filament with larger monofilament fineness is faster than the wicking speed of filament with smaller monofilament fineness,and the wicking height of the former is higher under the same twisting degree.Based on the fibrous pore structure characteristics in yarns and fabrics,the liquid water transfer process in the yarns and fabrics is simulated by using FLUENT software,which studies yarn twisting degree and monofilament fineness of yarns and fabrics have an effect on the absorption properties of yarns and fabrics.The axial velocity vector images,centerline velocity and center point velocity of each section on the warp axis are obtained.The results show that the wicking speed of low twist polypropylene yarn is faster than high twist polypropylene yarn,and the wicking height of the former is higher;the wicking speed of filament with larger monofilament fineness is faster than the wicking speed of filament with smaller monofilament fineness.As for fabric,the wicking speed of the low twist fabric is higher in the initial period,then the high twist fabric runs faster,and the wicking balance height of high twist fabric is higher;the wicking speed of the fabric with larger monofilament fineness is faster than the wicking speed of fabric with smaller monofilament fineness and the height of the former is higher.300D/64F and 600D/58F polypropylene filament yarn are selected to spin different twist polypropylene filament yarn,and fabrics with different structure parameters are woven.The vertical wicking experiments of corresponding yarns and fabrics,the results indicate that:1)Effect on the wicking performance of yarn:wicking speed of low twist yarn is faster than the high twist yarn and the wicking height of low twist yarn is higher under the condition of the same monofilament fineness;the wicking speed of 600D/58F filament is faster than the wicking speed of 300D/64F filament,and the wicking height of the former is higher under the same twisting degree.The experimental results are consistent with the results of the theoretical model and numerical simulation of the yarn.2)Effect on the wicking performance of fabric:the wicking speed of the low twist fabric is higher in the initial period,then the high twist fabric runs faster,and the wicking balance height of high twist fabric is higher under the condition of the same monofilament fineness;the wicking speed of the 600D/58F fabric is faster than the wicking speed of 300D/64F fabric,and the height of the former is higher under the same twisting degree.The experimental results are in agreement with the results of numerical simulation of fabrics.This paper establishes the relationship between the structure of the yarn and fabric and the water conductivity of the yarn and fabric from the microstructure of the yarn and fabric with the aid of mathematical model and numerical simulation method.The theoretical research is consistent with the experimental results.It provides an effective way to study the relationship between the wicking properties of the yarn and fabric,and provides a theoretical basis for the improvement of the function and the use of synthetic fiber and fabric.