The impact of raw composition, knitted fabric parameters and finishing of 1x1 rib knitwear on water vapor resistance

Abstract

Clothing comfort is very important feature which is considered as a result of different process of heat exchange between human body, clothing and environment. The purpose of this paper is to analyze the impact of raw composition, knitted fabric parameters and finishing on the heat water vapor resistance. The measurements was carried out on commercially 1x1 RIB knitted fabrics used for the production of next -to- skin shirts. The one group of samples are made from 100% cotton yarn and another with 96% cotton and 4% Lycra. It is noticed that knitted material composition affected the change in water vapor resistance. Also, this paper presents and verifies the correlation between the measured values of water vapor resistance (Ret) and the knitwear thickness (dpl), mass per unit area (mpl) the tightness factor (K), the porosity (ε) and the surface coefficient (δp). Based on these results, a mathematical model for calculating water vapor resistance is proposed. Comparing the results obtained with the proposed equation and the measured results, we can see that the deviations are minimal. The lowest deviation for sample CP3 is less than 0.0008%, while the largest deviation for sample CL1 is 0.023%.