Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China National Textile and Apparel Council.
This standard is under the jurisdiction of the National Technical Committee on Textiles of Standardization Administration of China (SAC/TC 209).
Textiles - Testing and evaluation for cool feeling in contact instant
1 Scope
This standard specifies the testing and evaluation method for cool feeling in contact instant with the skin.
This standard is applicable to various fabrics and their products.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
contact transient cool feeling
cool feeling in the brain through the temperature-sensing nerve endings in the skin resulting from the skin in contact instant with the fabric with a lower temperature causing the heat on the skin surface to lose rapidly and the temperature to drop instantaneously
3.2
contact cool feeling coefficient
qmax
maximum heat flux in the heat transfer process after the heat testing plate with a temperature higher than the specified temperature difference of the specimen contacting with the specimen under a certain pressure
Note: qmax is in the unit of J/(cm2·s).
4 Principle
Under the specified test environment, make a heat testing plate, with a temperature higher than that of the specimen, contact with the specimen to measure the temperature change of the plate with time, and calculate the contact cool feeling coefficient (qmax), which can characterize the contact transient cool feeling of the specimen. The higher the qmax is, the stronger the cool feeling is, and vice versa.
Note: The heat flux q is calculated using Equation (1), and qmax generally occurs at the instant (about 0.2s) after contact.
(1)
Where,
q——the heat flux in the heat transfer process after the heat testing plate is in contact with the specimen, J/(cm2·s);
Q——the heat transferred after the heat testing plate is in contact with the specimen, J;
C——the heat capacity of copper plate per square centimeter is (4.2±0.1)×10-1J/(℃·cm2);
S——the area of the copper plate, cm2;
ΔT——the temperature change of copper plate (heat testing plate), ℃;
Δt——the duration for contact between the heat testing plate and the specimen, s.
5 Test equipment
Cool feeling tester (see Figure 1), equipped with heat testing plate, specimen loading platform and automatic calculation and recording device, has the following specific requirements:
The heat testing plate is composed of copper plate closely attached to thermal insulation material and temperature sensor. The copper plate is the heat source component of the heat testing plate and shall be adjustable between 20℃ and 40℃; it shall have a flat surface which protrudes from the surface of the heat testing plate. The copper plate shall have a recommended area of 9cm2 and be in contact with the specimen during test, with the pressure generated on the specimen of (0.1±0.01)N/cm2. The temperature sensor shall have a response time of less than or equal to 0.2s and a resolution of 0.1℃.
Note: The copper plate shall have a thickness of about 1.20mm.
——Specimen loading platform, shall have a flat surface and a size of not less than the specimen area; shall have a good thermal insulation performance. The measured qmax shall be less than or equal to 0.08J/(cm2·s) when the temperature difference between the specimen loading platform (such as the platform made of polystyrene foam plate) and the heat testing plate is 15℃.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test equipment
6 Standard atmosphere for conditioning and test
7 Specimen preparation
8 Test steps
9 Result calculation
10 Evaluation
11 Test report
