Detail of GB/T 44139.1-2024

Introduction of GB/T 44139.1-2024

Requirements for sleeping bags - Part 1 : Thermal, mass and dimensional requirements for sleeping bags designed for limit temperatures of -20℃ and higher 1 Scope This document specifies the requirements, test methods and other provisions for the labelling of adult sized sleeping bags for use in sports and leisure time activities at a limit temperature ≥ -20 °C regarding thermal characteristics, dimensions and mass. Note 1: In case of implementing relevant product standards, the corresponding standards shall prevail. This document describes a test method for the assessment of performance in steady-state conditions of a sleeping bag with regard to the protection against cold. Note 2: Sleeping bags without homogeneous fillings designed to provide local extra insulation in certain parts pose issues with the calibration and/or test procedure. Ongoing work continues to provide suitable means of establishing temperature ratings. This document does not apply to sleeping bags intended for specific purpose such as military use and extreme climate zone expedition. It does not apply to sleeping bags for children or babies. Note 3: No prediction model exists for the determination of the limiting temperatures based on the thermal resistance of the sleeping bag for children and babies. Moreover, such a model for testing cannot be developed because the necessary controlled sleep trials with children or babies in climatic chambers are, out of ethical reasons, not possible. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 139 Textiles- Standard atmospheres for conditioning and testing Note: GB/T 6529-2008 Textiles - Standard atmospheres for conditioning and testing (ISO 139 : 2005, MOD) ISO 1096 Plywood- Classification ISO 3758 Textiles- Care labelling code using symbols Note: GB/T 8685-2008 Textiles - Care labelling code using symbol (ISO 3758 : 2005, MOD) ISO 11092 Textiles - Physiological effects- Measurement of thermal and water vapour resistance under steady- state conditions (sweating guarded-hotplate test) Note: GB/T 11048-2018 Textiles - Physiological effects - Measurement of thermal and water-vapour resistance under steady-state conditions (sweating guarded-hotplate test) (ISO 11092:2014, MOD) ISO 15831:2004 Clothing- Physiological effects - Measurement of thermal insulation by means of a thermal manikin EN 13088:2018 Manufactured articles filled with feather and down- Method for the determination of a filled product's total mass and for the determination of the mass of the filling 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminology databases for use in standardization at the following addresses: - ISO Online browsing platform: available at https:// www.iso.org/obp - IEC Electropedia: available at https:// www.electropedia.org/ 3.1 comfort temperature Tcomf lower limit of the comfort range, down to which a sleeping bag user with a relaxed posture, such as lying on their back, is globally in thermal equilibrium and at the threshold of feeling cold Note: For more information, see C.7.3. 3.2 limit temperature T lim lower limit at which a sleeping bag user with a curled-up body posture is globally in thermal equilibrium and at the threshold of feeling cold Note: For more information, see C.7.2. 3.3 extreme temperature Text very low temperature where the risk of health damage by hypothermia is possible Note 1: For more information, see C.7.1. Note 2: This is a point of danger that can lead to death. 3.4 maximum temperature Tmax upper limit of comfort range, up to which a partially uncovered sleeping bag user does not perspire too much Note: For more information, see Annex F. 3.5 thermal manikin dummy with human shape and heated body surface that allows the determination of thermal transfer through the sleeping bag under steady-state conditions Note: i.e. constant heat flux and temperature gradient between body surface and ambient air. 3.6 thermal resistance R c property of the sleeping bag that is related to the dry heat loss of the sleeping bag user, affected by the difference of temperature between the skin and the ambient air, as measured with a thermal manikin Note 1: The dry heat loss of the sleeping bag user is a combination of conductive, convective and radiative heat transfer. Note 2: This thermal resistance represents the insulative property of a sleeping bag, which includes the effects of the shell fabrics and filling materials, air volume in the cavity inside the sleeping bag, boundary air layer on the outer face of the sleeping bag, mattress underneath the sleeping bag and garments worn by the sleeping bag user. It is considered to be the total thermal insulation (see ISO 15831). 4 Requirements 4.1 Thermal properties for lower temperature limits Depending on the thermal resistance posture 1 Rc(1), the values for the extreme temperature (T ext), limit temperature (T lim) and comfort temperature (T comf) as given in Table 1 shall be used. If the thermal resistances posture 1 Rc(1) measured for the sleeping bag is in between the values in Table 1, a linear interpolation shall be performed on the basis of the nearest upper and lower values of the thermal resistances posture Rc(1). Test in accordance with 5.1.6.

Contents of GB/T 44139.1-2024