关键词: 干燥, 运动鞋, 温湿度, 风量, 瞬时含水率

Abstract: In recent years, China's sports shoes industry has maintained rapid development. In 2019, the market size of China's sports shoes industry reached 183 billion dollars, and the average annual compound growth rate from 2014 to 2019 was 20.6%. During daily wearing, sports shoes will produce moisture, odor and other problems due to sweating, which will not only affect the wearing comfort, but also adversely affect the function and health of human feet. Therefore, sports shoes need to be dried in daily care. Because the shoe is of three-dimensional structure with good overall shape stability, and the deformable variable of fabric or clothing is large, the research on the drying process of the whole shoe is different from that of fabric or clothing. In addition, the difference in structure, shape and material composition of sports shoes will have a great impact on the drying performance of sports shoes.
We aim to explore the influence of temperature, humidity and air volume on the drying of different types of sports shoes, so as to fill in the blank of quantitative evaluation of the drying performance of shoe care products. Firstly, the drying test method of sports shoes was studied. Three representative sports shoes (running shoes, basketball shoes and clunky sneakers) were selected, and the significant sweating area of sports shoes was humidified according to the sports sweating simulation, and the experiment was terminated when the instantaneous moisture content (M) reached 0.5%. Then, the temperature and humidity changes of shoe box environment and shoe cavity were tested under different temperatures and air volume conditions to explore the impact of temperature and air volume on the drying of sports shoes. According to the experimental results, the optimal design of adding guide tubes was proposed. On this basis, the drying laws of different types of sports shoes were analyzed, and the effects of temperature and air volume on the drying time of different types of sports shoes were discussed. The results show that the drying driving force increases with the increase of the ambient temperature of the shoe box and the hot air volume, but when the ambient temperature of the shoe box increases above 36 ℃, the relative humidity in the shoe cavity and the shoe box environment does not decrease significantly. When the hot air volume is 116.64 m3/s, the increase of the shoe box environment temperature has less influence on the reduction of the relative humidity. For basketball shoes and clunky sneakers, the drying time is more affected by the air volume than the ambient temperature of the shoe box. For running shoes, the drying time is affected by the ambient temperature and air volume of the shoe box.
There are various types of shoe care products on the market, but there is still a lack of evaluation standards for their drying performance and a lack of theoretical support for the design of key parameters such as temperature and humidity. The results of this study can provide a theoretical basis and reference for appliance companies in the design of care shoe box parameters and product design, to comprehensively achieve the goal of shortening the drying time of care shoe boxes and to provide differentiated drying parameter settings for different types of sports shoes.

Key words: drying, sports shoes, temperature and humidity, air volume, instantaneous moisture content