A REVIEW ON SUN-PROTECTIVE CLOTHING

The sun is ultraviolet (UV) radiation source. Damage to skin cells from ultraviolet exposure can lead to the carcinogenic problem such as skin cancer. Clothes and protective agents in cosmetics could be supplied personal protection from UV radiations. The assessment of UV transmittance of clothing and the determination of the UV protection factor (UPF) is crucial for skin cancer. The pathogenesis of epithelial skin cancers causes effects in the human bodies such as squamous cell carcinoma (SCC) and basal cell carcinoma (BCC) and malignant melanoma (MM) could be prevented by suitable UV-protective clothing. UV protective clothes have some characteristic properties such as fiber type, yarn construction, fabric construction, fabric weight and thickness, coloring process, standards and presence of UV radiation absorbers. These parameters have a direct effect on the effectiveness of sun protection and consequently the risk of skin cancer. The increasing of skin cancer rates in past several decades has increased the interest sun-protective clothing. A lot of work has been done around the world on about sun-protective clothes. The aims of this review are to explain properties, standards, and applications of sun-protective clothes, change people's sun behavior and raise awareness for the use of adequate sun-protective clothing

King, Martin Luther Jr.

Walking in Mississippi with Andrew Young. From: Martin Luther King Jr. pg. 179https://dh.howard.edu/pp_negatives/2925/thumbnail.jp

EFFECT OF POLIESTER POY FIBRE CROSS-SECTION ON THE YARN PROPERTIES OF AIRJET TEXTURING

POY yarns are well know and commercialized since 1970s. On the other hand, air-jet textured yarns are very common due to their unique structure which looks like natural spun-staple yarns. In the air-jet texturing process, the yarn is textured by overfeeding into a high-pressure of air to create a looped and more natural yarn appearance and also the bulkiness level of the yarn is controlled by input speed and jet-take out speed. This process reassigns flat, continous synthetic yarns into entangled, convoluted, bulky, spun like structured yarns. They are of higher bulk, exhibits increased covering power, have a more subdued lustre and are warmer in hand. Therefore, air-jet textured yarns possess some unique properties that require investigation. Hence, in this study, first the texturing process is introduced briefly and its principle of manufacturing is illustrated, later four different types of yarns were produced with two different fibre cross-sections at the three different nozzle types and three different core yarn feeding. The produced yarn production details are given and their breaking strength, elongation and work of rupture are studied along with their morphological structures by using light microscope and SEM. The aim of this study is to investigate the effect of POY fibre cross-section on air-jet textured yarn mechanical properties. The overall results showed that coarser air-jet textured yarns with a round shape have higher breaking strength, elongation and work of rupture than the trilobal shaped yarns. On the other hand, half matted yarn which was applied TiO2 has also presented better breaking strength and elongation