Protective clothing – test methods and criteria of tear resistance assessment

Abstract

Purpose -The state-of-the-art of existing methods of tear resistance (static and dynamic) of clothing has been described, also presented are the parameters of static tear resistance for protective and work clothing depending on its application. Design/methodology/approach -For chosen group of fabrics the introduction of a new parameter of dynamic tear resistance was proposed. For research, five static tear test methods and the dynamic one were chosen. In order to find the relationship between the results of mean tear forces for the six described methods Kendall's agreement coefficient was calculated. The comparative measurements for results of static tear resistance and dynamic tear resistance for protective and work clothing were carried out. On the basis of this, the value of tear dynamic force for these fabrics was established. Findings -When establishing the criteria for the tear strength for protective and work clothing, the most significant was fabric end-use and the minimal value of tear strength associated. Practical implications -The value of dynamic tear resistance can be the criterion for assessment of fabrics with regard to textiles exposed to tearing during application. It was the first comparative analysis of the measurement of tear resistance methods. Originality/value -Investigating test methods for the assessment of clear resistance.

Static Tearing, Part I: Its Significance in the Light of European Standards

“…Moreover, the described methodology in PN-EN ISO 469:2006/A1:2007(U) [33] for coated and non-coated fabrics on the tear strength is the same (the same sample shape and way of calculation), which enables the comparison of obtained results. It is worth noting that (as was shown in [18,19]) by this method we can obtain the lowest result of tear force (high level of the "safety coefficient"). It is important in the case of cotton protective clothing, which measured by this method of tearing can not fulfill this criterion.…”

“…In laboratory measurements, there are actually five standardized sample shapes. Research on the analysis of static tear strength methods and correlation between results of the tearing force obtained by different methods are presented elsewhere [17][18][19]. The methodology, as well as the way of calculating results, were unified.…”

Mechanical and Tribological Behavior of Woven Sisal Fabric

“…In these RESEARCH applications fabrics are subjected to axial, tearing, wear and bursting loading conditions. Beata et al studied tearing strength of cotton blends with synthetic fibers under static and dynamic loading conditions and observed that weft direction having better tear strength than warp [5]. These woven fabrics were used to prepare composites using various polymers.…”

Static Tearing, Part II: Analysis of Stages of Static Tearing in Cotton Fabrics for Wing-shaped Test Specimens

“…• an analysis of the existing tear resistance models and their possible application [1]; • a review of tear resistance parameters of produced cotton fabrics and assessment of particular measurement method utility for the determined textile assortment groups [1,2]; • an analysis of static tear resistance methods used in metrological laboratories [3,4]; • finding the significant common features and differences in behavior of samples, which underwent different tearing methods i.e. the characteristics of particular tearing methods dependent on the sample shape and tearing direction in relation to the tearing force [4]; • finding the relationship between the results obtained by different tearing methods, and the influence of a result calculation method on the mean tearing force [5]; • possibilities of elaboration of computer system for predicting the tear and tensile strength of cotton fabrics on the basis of introduced data concerning the component threads and fabric structure parameters.…”