Comfort Performance And Mechanical Properties Research Of Special-shaped Hollow Polyamide Filament Seamless Knitted Fabric

This project mainly research related performance about seamless knitted fabric made of triangle hollow polyamide, triangle hollow polyamide ,a type of differential fiber , by the way of changing cross section shape to get the triangle hollow fiber. In order to research performance of triangle hollow polyamide, adopting common polyamide, triangle hollow polyamide, circular hollow polyamide yarn as veil, to weave three type of seamless knitted fabric, next to contrast performance of different fabric, finally, to evaluate the performance of triangle hollow polyamide.This project select orthogonal experiment to establish experiment plan. In the orthogonal experiment, set up three factors: A (yarn type) factor including three levels, that three yarn are: ordinary polyamide, triangle hollow polyamide, circular hollow polyamide, Factor B (stitch) also includes three levels, that are three stitch, which are currently typical stitch in the design of seamless knitted underwear, they respectively are plain stitch, 1×1 false rib stitch, 1×3 false rib stitch; Factor C (pressure needle) : the pressure needle 1 (average pressure needle + 120), pressure needle 2 (average pressure needle + 114). "Seamless knitting underwear as the new favorite product in underwear field, "integrating comfort suitability and diversity style in one suit. Once molding is the biggest characteristic of Seamless underwear, good or bad method of design not only affect its appearance effect, such as drapability and close degree, colour and design style etc, and more important it will affect wearing comfort of seamless underwear, such as permeability and moisture-penetrability and thermal retention etc., there are many factors influence appearance or wearing comfort of seamless underwear product, the main factors includes the yarn types, structure, and the length of the coil, so it is necessary to research dimensional stability and thermal-wet comfort of seamless knitted underwear by different yarn , structure and coil density. Adopting L₁₈(2×3⁷) orthogonal table to analyze relation between each factor level and fabric performance index, longitudinal or transverse washing shrinkage rate of fabric , specified elongation resilience rate, permeability rate, moisture-penetrability rate, wicking height, warming factor . According to analysis of range and combinatorial optimization draw a conclusion: the order of influence fabric longitudinal washing shrinkage rate by each factor is RB (stitch) > RA (yarn) > RC (pressure needle), in factor B , the biggest longitudinal washing shrinkage rate of fabric is 1×3 false rib stitch fabric, next is 1×1 false rib stitch fabric, the minimum is plain stitch fabric; the order of influence fabric transverse washing shrinkage rate by each factor is: RA (yarn) > RC (pressure needle) > RB (stitch), in factor A , the order of influence fabric transverse washing shrinkage rate by each level: circular hollow polyamide > common polyamide> triangle hollow polyamide ,The transverse shrinkage rate of triangle hollow polyamide seamless knitted fabric is minimum; the order of influence fabric specified elongation resilience rate by each factor: RB (structure) > RC (pressure needle) > RA (yarn), and the largest specified elongation resilience rate is 1×1 false rib stitch fabric, next is 1 x 3 false rib stitch fabric, specified elongation resilience rate of plain stitch fabrics is minimum; the order of influence fabric permeability rate by each factor is: RA (yarn) > RC (pressure needle) > RB (stitch), in the factor A, the order of influence fabric permeability rate by each level is: triangle hollow polyamide > circular hollow polyamide> ordinary polyamide. It shows abnormity hollow polyamide seamless knitted fabric is better than ordinary polyamide seamless knitted fabric in permeability, especially permeability of triangle hollow polyamide seamless knitted fabric is the best in three ; the order of influence fabric moisture-penetrability rate by each factor is: RA (yarn) > RC (pressure needle) = RB (structure), in factor A, moisture-penetrability rate of triangle hollow polyamide fabric is heaviest, next is ordinary polyamide fabric, and moisture-penetrability rate of circular hollow polyamide fabric is lightest, the order of influence fabric wicking height by each factor is: RA (yarn) > RB (stitch) > RC (pressure needle), in factor A ,the highest wicking height is ordinary polyamide fabric, next is triangle hollow polyamide fabric, and the lowest wicking height is circular hollow polyamide fabric; the order of influence fabric warming factor by each factor is: RA (yarn) > RB (structure) > RC (pressure needle), in factor A , the highest warming factor is circular hollow polyamide fabric, next is triangle hollow polyamide fabric, and the lowest warming factor is ordinary polyamide fabric.