Thermal Resistance of Leather and Membranes for Summer Desert Military Footwear Under Different Climate Conditions
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The desert climate is characterized by a big gap between day and night temperatures. In summer dry season, daytime temperatures can approach 45 °C and drop to 15 °C during the night. Aim of the paper is to investigate thermal resistance of footwear layers in military footwear for dry desert season under different climate conditions focusing on the temperature difference between day and night. Thermal resistance was determined using the Sweating Guarded Hotplate equipment according to the standard ISO 11092 and under climate condition known in deserts, respectively, 15 and 30 °C with relative humidity of 40%. Increasing the temperature, thermal resistance of leather for collar have tendency to decreases, while thermal resistance of leather for vamp and quarter have tendency to increase. The thermal resistance differences are not great but different tendencies of thermal resistance change is visible. It can be concluded that leather thickness influences on thermal resistance change under temperatures range of 15–30 °C. Behavior of the membranes under different temperatures is various. With the temperature increase, thermal resistance of two-layered membrane for tongue decreases for 5.9%. Thermal resistance differences, in temperature range of 15–30 °C, between minimum and maximum values for quarter and lining membranes are 17% for quarter and 13% for lining. Thermal resistance of fabrics for special uses, as protective footwear, should take in consideration climatic conditions under which fabrics will be used.
KeywordsThermal resistance Military footwear Climate conditions Cattle velour suede leather
The research is conducted from the project IP-2016-06-5278 with the support of the Croatian Science Foundation.
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