Ultraviolet Protection Factor of Hemp/Filament Hybrid Yarn Knitted Fabrics

• Main Authors: Stanković Snežana, Popović Dušan, Kocić Ana, Poparić Goran
• Format: Article
• Language: English
• Published: University of Ljubljana, Faculty for Natural Sciences and Engineering 2017-03-01
• Series: Tekstilec
• Subjects: ultraviolet protection factor; hemp/filament hybrid yarn; knitted fabric; air permeability
• Online Access: http://www.tekstilec.si/wp-content/uploads/2017/03/10.14502Tekstilec2017.60.49-57.pdf

It is generally accepted that synthetic fibres provide high UV protection capability of textile products, while cellulose fibres have low UV absorption capacity. However, textile materials made of synthetic fibres are not considered to be comfortable for wear in warm weather, whereas cellulose-based textile materials are considered to be much more comfortable to wear, especially in the summer months. For this research, the idea was to produce specially blended knitted fabrics from staple/fi lament hybrid yarns in order to provide clothing materials with eff ective UV protection properties, keeping satisfactory comfort properties as well. To obtain hybrid yarns, folding technique was used. The Ultraviolet Protection Factor (UPF), as a quantitative measure of the eff ectiveness of the material to protect human skin against UV radiation, was determined for the rib knitted fabrics by in vitro test method according to the European standard. The physical properties of the knitted fabrics related to their UV protection properties: bulk density, porosity and air permeability were also determined. The hybrid yarns, from which the rib knitted fabrics were produced, having always hemp yarn as a staple component, caused the differences in UV protection capability of the rib knitted fabrics through the influence of a filament spun component. The hybrid yarn aggregation within knitted fabrics also fibrestheir UPF values. Even though the pure hemp knitted fabric was marked as “UPF>50” (according to European standard) due to natural pigments and lignin in hemp fibres which act as UV absorbers, most of the hemp/fi lament hybrid yarn knitted fabrics exhibited even higher UPF. Therefore, the engineering approach proposed in this research was confi rmed as an eff ective way to design clothing materials with optimal UV protection capability and other wear comfort parameters.