ISO 11092:2014 テキスタイル—生理学的効果—定常状態での耐熱性と水蒸気耐性の測定（発汗ガード付きホットプレートテスト） | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 38, Textiles.

This second edition cancels and replaces the first edition (ISO 11092:1993), which has been technically revised. It also incorporates Amendment 1 to ISO 11092:1993 (ISO 11092:1993/Amd.1:2012).

Introduction

This International Standard is the first of a number of standard test methods in the field of clothing comfort.

The physical properties of textile materials which contribute to physiological comfort involve a complex combination of heat and mass transfer. Each may occur separately or simultaneously. They are time-dependent, and may be considered in steady-state or transient conditions.

Thermal resistance is the net result of the combination of radiant, conductive and convective heat transfer, and its value depends on the contribution of each to the total heat transfer. Although it is an intrinsic property of the textile material, its measured value may change through the conditions of test due to the interaction of parameters such as radiant heat transfer with the surroundings.

Several methods exist which may be used to measure heat and moisture properties of textiles, each of which is specific to one or the other and relies on certain assumptions for its interpretation.

The sweating guarded-hotplate (often referred to as the “skin model”) described in this International Standard is intended to simulate the heat and mass transfer processes which occur next to human skin. Measurements involving one or both processes may be carried out either separately or simultaneously using a variety of environmental conditions, involving combinations of temperature, relative humidity, air speed, and in the liquid or gaseous phase. Hence transport properties measured with this apparatus can be made to simulate different wear and environmental situations in both transient and steady-states. In this International Standard only steady-state conditions are selected.

1 Scope

This International Standard specifies methods for the measurement of the thermal resistance and water-vapour resistance, under steady-state conditions, of e.g. fabrics, films, coatings, foams and leather, including multilayer assemblies, for use in clothing, quilts, sleeping bags, upholstery and similar textile or textile-like products.

The application of this measurement technique is restricted to a maximum thermal resistance and water-vapour resistance which depend on the dimensions and construction of the apparatus used (e.g. 2 m²·K/W and 700 m²·Pa/W respectively, for the minimum specifications of the equipment referred to in this International Standard).

The test conditions used in this International Standard are not intended to represent specific comfort situations, and performance specifications in relation to physiological comfort are not stated.

2 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

2.3

water-vapour permeability index

i_mt

ratio of thermal and water-vapour resistances in accordance with Formula (1):

(1)

where S equals 60 Pa/K

Note 1 to entry: The water-vapour permeability index is dimensionless, and has values between 0 and 1. A value of 0 implies that the material is water-vapour impermeable, that is, it has infinite water-vapour resistance, and a material with a value of 1 has both the thermal resistance and water-vapour resistance of an air layer of the same thickness.

2.4

water-vapour permeability

W_d

characteristic of a textile material or composite depending on water-vapour resistance and temperature in accordance with Formula (2):

(2)

where ϕT_m is the latent heat of vaporization of water at the temperature T_m of the measuring unit, equals, for example, 0,672 W·h/g at T_m = 35 °C

Note 1 to entry: Water-vapour permeability is expressed in grams per square metre hour pascal.