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Textiles -- Testing and evaluation for cool feeling in contact instant
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GB/T 35263-2017: PDF in English (GBT 35263-2017)
GB/T 35263-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.30 W 04 Textiles - Testing and evaluation for cool feeling in contact instant ISSUED ON: DECEMBER 29, 2017 IMPLEMENTED ON: JULY 01, 2018 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Principle ... 5 5 Test equipment ... 5 6 Standard atmosphere for humidity conditioning and test ... 6 7 Preparation of specimen ... 7 8 Test procedure ... 7 9 Result calculation ... 7 10 Assessment ... 7 11 Test report ... 8 Textiles - Testing and evaluation for cool feeling in contact instant 1 Scope This standard specifies the testing and evaluation methods for the instant cooling performance of textiles in contact with the skin. This standard applies to all kinds of fabrics and their products. 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 6529 Textiles - Standard atmospheres for conditioning and testing GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values 3 Terms and definitions The following terms and definitions apply to this document. 3.1 Contact transient cool feeling When the skin is in contact with fabrics below its temperature for an instant, causing rapid loss of heat on the surface of the skin and an instantaneous drop in temperature, forming a cool feeling by reflecting the temperature- sensitive nerve endings in the skin to the brain. 3.2 Contact cool feeling coefficient qmax When the thermal detection plate whose temperature is higher than the 7 Preparation of specimen Cut 5 representative specimens. The size of each specimen is about 200 mm × 200 mm. Sampling shall avoid defects and wrinkles that affect the test results. 8 Test procedure 8.1 Set the temperature of the sample loading platform to (20 ± 0.5) °C. Spread the specimen flat on the sample loading platform, with the fabric surface in contact with the skin facing up. 8.2 Set the temperature of the thermal detection board to (35 ± 0.5) °C; the temperature difference (ΔT) from the sample loading platform is 15 °C. If other temperatures are used, they must be noted in the report. 8.3 After the temperature of the thermal detection plate reaches the temperature set in 8.2 and remains stable, cut off the heat source of the thermal detection plate and quickly place it vertically on the specimen, so that the surface of the copper plate is in contact with the fabric. Record the measured qmax. Keep the result to 3 decimal places, in Joule per square centimeter second [J/(cm2·s)]. 8.4 Determine all other specimens according to the steps 8.1 ~ 8.3. Note: The test time is generally within 10 s. 9 Result calculation Calculate the average value of qmax of 5 specimens. The result shall be rounded to two decimal places according to GB/T 8170. 10 Assessment If necessary, evaluate the instant cool feeling of the sample. When ΔT = 15 °C, the evaluation index is as shown in Table 1.
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.