Abstract
In this paper, the ultraviolet protection factor (UPF) of weft knitted fabrics made from 20Ne cotton yarn, Coolmax yarn and their blends in dry, relaxed and stretched states were studied. According to the fibre composition, samples were divided into three groups: Group I (single cotton yarn); Group II (cotton/cotton combination); and Group III (Coolmax/cotton combination) for discussion. In addition, yarn and fabric properties such as yarn tenacity, yarn strength, fibre combination and water vapour transmission that affect the corresponding UPF values are used for formulating a prediction model in order to determine UPF. Generally speaking, when samples are measured under stretched conditions in a dry state, they exhibit a remarkable reduction in ultraviolet protective power, as pores are opened up and UV radiation can easily penetrate through these pores. In addition, greater stretch percentage came along with greater reduction in UPF. This can be explained by the fact that the amount and the size of pores increase when samples are subjected to greater tension.
Highlights
Knitwear prevails as an indispensable type of garment for the summer
The weft knitted fabrics used were divided into three groups, and their results are summarized as follows: (i) For Group I, ultraviolet protection factor (UPF) ratings were compared in two aspects, i.e., spinning method and fibre type
Cotton yarns produced from a conventional ring-spinning method can well protect against UV radiation compared with torque-free ring-spun yarn, and it is believed that the yarn twist plays an important role in affecting UPF
Summary
Knitwear prevails as an indispensable type of garment for the summer. The UV protection provided by a regular single jersey white garment can be good if measured in the relaxed state. UV radiation penetration increases almost linearly with stretch By using this equation, the increase in UV radiation penetration (i.e., reduction in UPF) can be predicted from the transmittance spectrum in the relaxed state. Coolmax is a modified polyester fibre with cross-sectioning of the proprietary tetra channel. This feature has the ability to pull moisture from the skin in a process called “wicking.” To be more specific, the Coolmax fabric absorbs and spreads moisture out across fabric thickness to enhance evaporative drying as this increases surface area by 20% compared with yarn of the same linear density. The influence of stretching on the UV protection of cotton and cotton/Coolmax-blended weft knitted fabric in a dry state is studied
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