织物与皮肤动态接触下的湿感觉阈限与强度评价

为研究织物以不同速度与皮肤动态接触过程中对湿感觉的影响,分析了湿感觉绝对阈限与阈上强度的影响机制。通过向织物内添加定量的水,让受试者应用心理学标尺对湿感觉的阈上强度进行评分;然后通过注射泵向织物持续加水直至受试者感觉到湿,记录此时的加水量为绝对阈限;最后采用温度传感器记录测试皮肤区域的温度变化,计算皮肤冷却率。结果表明:皮肤冷却率与湿感觉阈上强度呈正相关,与绝对阈限呈负相关;湿感觉阈上强度可根据织物的最大瞬态热流量、含水量和摩擦因数进行预测,绝对阈限可根据织物的润湿时间和摩擦因数进行预测;绝对阈限适用于评价皮肤在初始出汗状态下的湿敏感性,在皮肤大量出汗时用阈上强度可更好地评价湿敏感性。

Threshold and intensity evaluation of skin wetness perception under dynamic contact with fabrics

To gain insight into how fabrics affect the perception of wetness under dynamic skin contact at different velocities,the influencing mechanism of absolute threshold and intensity of the perception of wetness were investigated.By applying quantitative amounts of water(low,medium,and high)to each of the testing fabrics,participants reported the intensity of perceived wetness on a psychometric scale.In addition,water was supplied continually with a pump until the threshold of wetness was perceived by the participants.At the same time,the temperature sensors were used to record local skin temperature and calculate skin cooling rate.The results indicate that skin cooling rate has a significant positive correlation with wetness intensity rating,while a negative correlation with absolute threshold.The intensity rating of wetness perception is predicted by the physical parameters of the fabrics,that is maximum transient thermal flow,water content,and friction coefficient,while wetness threshold was predicted by wetting time and coefficient of friction.The threshold detection was qualified to evaluate the sensitivity to wetness at the initial detection of moisture on the skin,while the stimulus intensity rating would give a better prediction at the moisture absorption stage.This study provides the evaluation technology for designing clothing with desirable wetness levels.