GB/T 30127-2013 English PDF (GBT30127-2013)

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GB/T 30127-2013: Textiles -- Testing and evaluation for far infrared radiation properties
GB/T 30127-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Textiles - Testing and evaluation for far infrared
radiation properties
ISSUED ON: DECEMBER 17, 2013
IMPLEMENTED ON: DECEMBER 01, 2014
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 ... 4 
5 Instruments and tools ... 5 
6 Test environment and preparation ... 7 
7 Test procedure ... 8 
8 Result calculation and evaluation ... 9 
9 Test report ... 10 
Textiles - Testing and evaluation for far infrared
radiation properties
1 Scope
This standard specifies the method for measuring the far-infrared radiation
property of textiles by the far-infrared emissivity and temperature rise test; gives
the evaluation of the far-infrared radiation property.
This standard applies to all types of textile products, including fibers, yarns,
fabrics, non-woven fabrics and their products. Other materials can refer to it.
This standard does not involve the evaluation of medical effects.
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 8629-2001 Textiles - Domestic washing and drying procedures for
textile testing
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Far infrared emissivity
The ratio of the normal far-infrared radiation intensity between the specimen
and the standard blackbody plate at the same temperature under specified
conditions.
4 Principle
4.1 Determination of far-infrared emissivity
Place the standard blackbody plate and the specimen on the hot plate one after
5.3 An open cylindrical metal container which has a diameter of 60 mm and a
height of 30 mm.
5.4 For the yarn specimen frame, the effective test size shall not be less than
the size of test hot plate.
6 Test environment and preparation
6.1 Specimen humidity conditioning and environmental requirements
The humidity shall be conditioned in accordance with the standard atmospheric
temperature and humidity environment and procedures as specified in GB/T
6529; there shall be no other heat radiation sources affecting it.
6.2 Pretreatment
6.2.1 If necessary, wash the samples in accordance with the 7A procedure in
GB/T 8629-2001; the number of washes shall be agreed by the parties
concerned.
Note: The number of washing times should be no less than 30 for inner wear, 10 times
for outer wear; not less than 5 times for bedding. In the case of multiple washings, the
time can be accumulated for continuous washing, or washing according to the method
and number of times approved by the relevant party. The number of washings and
methods are described in the report.
6.2.2 Condition the humidity of the sample in the environment as specified in
6.1 to make it reach balance; do not contaminate the sample.
6.3 Preparation of specimen
6.3.1 Fiber
When measuring the far-infrared emissivity, open the fiber specimen into a fluffy
state; take 0.5 g of fiber and fill it into an open cylindrical metal container which
has a diameter of 60 mm and a height of 30 mm. The fiber is completely filled
in the container; take at least 3 specimens from each set of sample. When
determining the temperature rise, comb the fibers into a fluffy state; evenly
spread it to a uniform cylindrical flocculus which has a thickness of about 30
mm and a diameter of more than 60 mm. Take at least 3 specimens from each
set of samples.
6.3.2 Yarn
Lay the yarn specimen in a single layer tightly and fix it on a square metal
specimen frame which has a side length of not less than 60 mm. When
measuring the far-infrared emissivity, place the specimen frame flat and
completely cover the hot plate. When measuring the temperature rise, fix the
specimen frame vertically on the specimen holder of the temperature rise
device, with the center of the specimen frame directly facing the center of the
specimen holder's opening. Take at least 3 specimens for each of the emissivity
and temperature rise tests.
6.3.3 Sheet samples such as fabrics
Cut at least 3 specimens for emissivity and temperature rise from each sample.
The size of the specimen is not less than 60 mm in diameter. The specimen
shall be flat and representative when sampling. If there are areas in the sample
that may have large differences in far-infrared performance due to large
differences in structure, color, etc. (including splicing components in the
product), unless otherwise specified, each area shall be sampled separately.
7 Test procedure
7.1 Determination of far-infrared emissivity
7.1.1 Heat the test hot plate to 34 °C
7.1.2 Place the standard blackbody plate on the test hot plate; record the far-
infrared radiation intensity of the standard blackbody I0 after the test value is
stable.
7.1.3 Place the humidity-conditioned specimen on the test hot plate; record the
far-infrared radiation intensity of the specimen after the test value is stable (e.g.,
15 min).
Note: If some instruments can directly calculate far-infrared emissivity, record the far-
infrared emissivity value of each specimen.
7.1.4 Test the remaining specimens according to the steps in 7.1.3.
7.2 Test of far-infrared radiation temperature rise
7.2.1 Adjust the distance between the specimen holder and the radiation source,
so that the distance between the specimen surface and the radiation source is
500 mm.
7.2.2 Clamp the test surface of the humidity-conditioned specimen in the
specimen holder facing the infrared radiation source. Fix the contact of the
thermometer sensor at the center of the surface of the irradiated area of the
specimen.
7.2.3 Record the initial temperature of the sample surface T0.