| The purpose of this thesis is to discuss the rationality of using water-vapor transmission, which is tested with the signal layer of moisture barrier in the non-difference of temperature environment, as the determination of comfort of firefighting clothing in the domestic standard. Then, this study is to explore indices and test methods based on the producing and developing status quo of firefighters’clothing in China, and provide data and theoretic foundations for the revision of the standard in future.This study compared the requirements and measuring methods in different standards of firefighting protective clothing, and found that the domestic standard GA10-2002 uses "GB1037-88 Test method for water vapor transmission of plastic film and sheet-Cup method" as the test method of clothing comfort performance, which is out of date with the development of materials using in the firefighting clothing systems. Therefore, based on the apparel comfort theory, this study proposed three indices-water-vapor transmission, water-vapor resistance and total heat loss-to evaluate the comfort of fabric combinations used in firefighting clothing. In order to make these indices measured by different methods comparable with the requirements in standards, a series of formulas were computed for uniform the units. Simultaneity, three evaluative methods were come up with:desiccant method in a non-difference of temperature condition (MethodⅠ), water method in a non-difference of temperature condition (MethodⅡ) and thermal-moisture method in a difference of temperature condition (MethodⅢ). According to the experiment of single layer components and multilayered combinations, above evaluative indices and methods were compared and analyzed.The findings of the research on single layer components of firefighting clothing system shows that the testing condition and testing methods affect the results of water-vapor transmission and water-vapor resistance. If being a requirement in a standard, the test method and the test condition should be determined clearly. A correlation analysis is conducted on the water-vapor transmission and water-vapor resistance of single-layered samples, which shows that the three evaluative methods are correlated with each other significantly. The correlated coefficients of water-vapor resistance among the three methods are 0.965、0.983 and 0.954; and the correlated coefficients of water-vapor transmission among the three methods are 0.810、0.874 and 0.764. Therefore, the linear correlations of water-vapor resistance are better than the linear correlations of water-vapor transmission.In terms of the analysis of variance on orthogonal experiment, the moisture barrier plays the most important role on the whole thermal-moisture performance of the multilayered combinations because of the largest difference existing in the water-vapor transferred performance of moisture barriers. If the differences of the water-vapor transferred performance on each level are excluded, outer shells, thermal barriers and the interaction between outer shells and thermal barriers all affect the whole thermal-moisture performance of the multilayered combinations. Thus, the whole thermal-moisture comfort of the fabric system using in the firefighters’ clothing is determined by all the layers and their interactions. Outer shell, moisture barrier, and thermal barrier influence the whole comfort performance of the fabric system together.An integrative estimate was conducted on the three evaluative methods and three indices discussed in the paper. After the assessment from several aspects, water-vapor resistance and total heat loss from MethodⅢ-thermal-moisture method in difference of temperature condition-are the optimal evaluations of the comfort performance for the multilayered fabric systems used in firefighting protective clothing standard. |
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