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现行 ASTM D7340-07(2023)
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Standard Practice for Thermal Conductivity of Leather 皮革导热性的标准实施规程
发布日期: 2023-12-01
1.1 本规程旨在确定板材的导热系数。这种做法并不局限于皮革,而是可以用于任何导电性差的材料,如与鞋的结构相关的橡胶、纺织品和软木。 1.2 恒定热源夹在两个相同的金属圆柱体之间,这两个圆柱体的轴线垂直安装。将一个试样放置在上圆柱体的顶面上,将第三个相同的金属圆柱体放置在试样顶部,使所有圆柱体和试样同心对齐(参见 图1 ).打开热源,使三个块的温度达到平衡。然后,根据三个试块的稳态温度、试块和试样的暴露表面积以及试样的厚度来确定试样的热导率。 图1 SATRA Lees圆盘导热仪 1.3 这种做法不适用于湿蓝色。 1.4 本标准并不旨在解决与其使用相关的所有安全问题(如有)。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 鞋的部分功能是帮助脚部保持体温,防止热量发生大的变化。鞋结构中使用的材料的绝缘性能取决于孔隙率或存在的空气空间的量。 良好的绝缘材料具有低的热导率值, k 热导率值随着水分含量的增加而增加,因为 k 水的值很高,为0.0014 cal/s cm·°C(0.59 W/m·K)。
1.1 This practice is intended to determine the thermal conductivity of a sheet material. This practice is not limited to leather, but may be used for any poorly conductive material such as rubber, textile and cork associated with the construction of shoes. 1.2 A constant heat source is sandwiched between two identical metal cylinders which are mounted with their axes vertical. A test specimen is placed on the top surface of the upper cylinder and a third identical metal cylinder is placed on top of the test specimen so that all the cylinders and the test specimen are concentrically aligned (see Fig. 1 ). The heat source is switched on and the temperatures of the three blocks allowed to reach equilibrium. The thermal conductivity of the test specimen is then determined from the steady-state temperatures of the three blocks, the exposed surface areas of the blocks and test specimen and the thickness of the test specimen. FIG. 1 SATRA Lees' Disc Thermal Conductivity Apparatus 1.3 This practice does not apply to wet blue. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Part of the function of a shoe is to assist the foot in maintaining body temperature and to guard against large heat changes. The insulating property of a material used in shoe construction is dependent on porosity or the amount of air spaces present. A good insulating material has a low thermal conductivity value, k . The thermal conductivity value increases with an increase in moisture content since the k value for water is high, 0.0014 cal/s cm · °C (0.59 W/m·K).
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归口单位: D31.03
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