non-cast fabrics For Deeney methods - Casting coefficient of determination

Test Methods for Non-Cast Fabrics - Determination of Casting Coefficient
Test Methods for Non-Cast Fabrics - Determination of Casting Coefficient

The drapability and bending resistance of the fabrics are two important parameters in the physical properties of the fabric. Drape is an important feature that directly affects the appearance of the fabric during use. It is a feature of how the fabric reacts under its own weight and whether it changes its shape. Bending resistance is a feature that affects fabric drape. Bending relates to how much a horizontally fixed rectangular fabric deviates from this horizontal state under its own weight. The bending resistance is calculated by measuring the length of the fabric being bent at an angle by the effect of gravity.

Work on these two properties of fabrics has started at 1930. Firstly, fabric bending measurement was made by developing a device to determine the two-dimensional drift value. Then, the first equation of bending resistance is presented. Then, other devices were developed and a three dimensional drift analysis was performed and the drift coefficient was defined. As a result of these studies, three important drift criteria were determined: the surface of the draped fabric, the number of folds and the shape of the folds.

As consumers' quality expectations increase and their perception of comfort changes, it becomes inadequate to determine the drapability of fabrics using only one measuring device. Nowadays, studies are made based on dynamic drape measurements and new methods supported by image analysis techniques are developed in order to estimate the attitudes of the fabrics during their use after they have turned into garments. In this context, determination of casting coefficient is an important indicator.

The physical tests performed in the authorized laboratories are based on various standards issued by local and foreign organizations. For tests to determine the casting coefficient, which is among the test methods for non-cast fabrics, the following standard is considered: TS EN ISO 9073-9 Textile - Test methods for nonwovens - Part 9: Determination of casting coefficient.