Theoretical and Experimental Estimation of the Stored Energy of Plain Knitted Fabrics Using Yarn Pullout Test

Abstract

The yarn pullout test is a suitable method for investigating the internal mechanical properties of the fabric structure which is established during the weaving or knitting process. In this study, a theoretical model is presented to estimate the stored energy of plain-knitted fabrics which is determined using yarn pullout. The model can predict the stored energy in the fabric, based on the fabric dimensional properties of stitch length and yarn contact angle using force balance analysis. Moreover, in order to evaluate the suggested model, three types of plainknitted fabric from cotton, cotton/polyester and cotton/nylon with three different stitch lengths were produced and subjected to pull-out tests. Comparison between experimental and theoretical results, demonstrates a reasonable prediction. The results show that the cotton/polyester fabric has the maximum stored energy, because of its higher yarn to yarn friction coefficient. It was also found that, the increase in fabric's loop length leads to a decrease in the fabric's stored energy.

Testing and predicting of yarn pull-out in aroma-textile

“…Whereas, with the change of binder's concentration from 20 to 95 g/l and analysing all pulling interval (5-25 mm) it was determined that f increased mostly in 2.6-3.4 times but for the fabrics with highest weft density it increased even in 4.3 times (when binder's concentration was 50 g/l) and more. Since higher binder's concentrations were applied for the fabrics with higher weft density, the loop pile interactions within fabric were intensified on the crossing points resulting increased resistance to pile loop extraction, and this is in agreement with the other notices (Ravandi et al, 2004;Asayesh et al, 2012).…”

“…Investigating the effect of fabric material on the stored energy in the fabric it was observed that the cotton/polyester fabric has the maximum stored energy (Asayesh et al, 2012), calculated from the underneath area of force-displacement curve, due to higher yarn to yarn friction coefficient. Cotton/nylon and cotton fabrics are in the next stages, respectively.…”

“…Among various methods to evaluate mechanical properties of the fabric, the yarn pull-out test is a practical way to investigate the fabric's internal deformations caused by the constituent yarns (Asayesh et al, 2012). We used cotton/ramie terry composition for investigations.…”

“…Together with substantiality of loop architecture which provides the enlarged volume, it is very important that loop pile be securely held in the place to prevent loop pulling. It is known that yarn pull-out test is a suitable method for investigating the mechanical properties of the fabric structure which is established during weaving process (Asayesh et al, 2012). Unfortunately, there are no any data about mechanical properties of terry textile treated with microcapsules.…”

Influence of terry fabrics structure and finishing on yarn pull-out behaviour

“…It is found (Badrossamay et al, 2001) that yarn pull-out behaviour analysing woven polyester fabric is an important indicator of the mechanism of yarn interactions within the textile. It is evident that the yarn pull-out test is a suitable method for investigating the internal mechanical properties of fabric structure performed during woven or knitted fabric manufacturing processes (Asayesh et al, 2012). The theoretical model is presented to estimate the stored energy of plain-knitted fabrics which is determined using yarn pull-out.…”