GB/T 22799-2019 English PDF (GBT22799-2019)

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GB/T 22799-2019: Test method for absorption of towel products
GB/T 22799-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.160
W 55
Replacing GB/T 22799-2009
Test method for absorption of towel products
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Principle ... 4 
4 Test conditions ... 4 
5 Reagents or materials ... 5 
6 Apparatus ... 5 
7 Sample ... 6 
8 Test procedures ... 7 
9 Test data processing ... 9 
10 Test report ... 9 
Appendix A (Informative) Installation drawing of test apparatus for method B 11 
Test method for absorption of towel products
1 Scope
This Standard specifies the test method for absorption of towel products.
This Standard applies to all kinds of towel products using textile fibers as raw
materials.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 8629-2017 Textiles - Domestic washing and drying procedures for
textile testing
3 Principle
3.1 Method A - Sedimentation method: After the sample is washed, dried and
conditioned, under a standard state, measure the time required for the sample
from contact with the water surface to completely wetted and begin to sink, to
determine the absorption of the sample.
3.2 Method B - Absorption method: After the sample is washed, dried and
conditioned, under a standard state, a certain amount of water flows through
the sample within a specified time. Determine the percentage of the amount of
water absorbed by the sample to the amount of original water as the water
absorption rate of towel.
4 Test conditions
4.1 The environmental conditions for conditioning shall meet the requirements
of standard atmospheres of GB/T 6529.
4.2 If pre-conditioning is required, it shall be carried out under atmospheric
conditions with a relative humidity of 10%~25% and a temperature not
exceeding 50 °C.
5 Reagents or materials
5.1 Accompanying laundry: USE type III (100% polyester fiber accompanying
laundry) specified in GB/T 8629-2017.
5.2 Detergent: USE standard detergent 3 (ECE standard detergent 98)
specified in GB/T 8629-2017.
6 Apparatus
6.1 Fully-automatic washing machine: Type A standard washing machine (see
5.1.1 in GB/T 8629-2017); front door charging; horizontal rolling type.
Note: Other apparatus, which have been proven to give the same test results, can also be
used.
6.2 Rotary tumble dryer: Tumble dryer used with type A standard washing
machine (see 5.2 in GB/T 8629-2017).
Note: Other dryers, which have been proven to give the same test results, can also be
used.
6.3 Water flow tester: Funnels, valves, devices, pipelines and measuring
cylinders installed on the water flow tester shall not obstruct the flowing out of
water. The time difference from opening the valve to the water flowing out shall
be less than 8.0 s.
The composition of the water flow tester is shown in Figure 1, including the
following components:
a) Waterproof base: See Appendix A for dimensions and specifications;
b) Waterproof circular retainer ring: The inner ring outer diameter is
(150±2)mm;
c) Measuring cylinder: Organic glass material; 50 mL; see E in Figure 1;
d) Funnel: Polypropylene material; the inner diameter of the neck is
(9.0±2.0)mm.
6.4 Beaker: Capacity is 1000 mL.
ADD (20±1)g of standard detergent (5.2); WASH according to the procedures
specified in Clause 9 of GB/T 8629-2017.
7.3 After washing, immediately put the sample and the accompanying laundry
into the dryer; SET the drying temperature to (66±5)°C and dry the sample.
7.4 After the sample is dried, take it out immediately; SHAKE it gently to remove
the lint; PICK up the lint and thread residue entangled on the towel. Expose the
sample to the standard atmosphere for textile conditioning (see 4.2), until it
reaches a constant weight (weigh continuously at 2 h intervals; when the mass
change is not greater than 0.25%, it is considered to have reached a constant
weight).
8 Test procedures
8.1 Method A - Sedimentation method
8.1.1 Along the diagonal direction of the sample (see Clause 7), respectively
cut out test specimens with a size of 5 cm×5 cm; 1 group on the front and back
respectively; each group shall include at least 3 test specimens. When sampling,
it shall avoid decorative parts such as satin or embroidery.
8.1.2 USE a measuring cylinder (6.7) to take 800 mL of grade 3 water or
deionized water. The water temperature is (20±2)°C. The water level is not less
than 5 cm.
8.1.3 PLACE the test surface of the test specimen on the water surface in
parallel and lightly without external force; START timing at the same time. When
the sample is completely wetted and begins to sink, stop the timing and record
the required time t, accurate to 0.1 s. If the sample is not completely wetted for
more than 90 s, the test is terminated; the time required is recorded as greater
than 90 s.
8.1.4 REPEAT the test according to 8.1.3. TEST 3 test specimens for the front
and back respectively.
8.1.5 Calculate the measured average value of the front and back test
specimens. According to GB/T 8170, round to one decimal place.
8.1.6 If 1 of the 6 test specimens exceeds 90 s, add 1 test specimen for this
test surface. If the added test specimen does not exceed 90 s, calculate the
average value of the 6 test specimens that do not exceed 90 s; and, indicate
that 1 test specimen is greater than 90 s. If the added test specimen exceeds
90 s, the test is ended; the result is recorded as greater than 90 s.
8.2.7 REPEAT the steps 8.2.2~8.2.6 for the remaining 5 test specimens.
9 Test data processing
9.1 Method A - Sedimentation method
According to formula (1), calculate the average value of the water absorption
time of sample; ROUND to one decimal place according to GB/T 8170.
Where:
𝑡̅ - The average water absorption time of sample, in seconds (s);
ti - The water absorption time of each test specimen, in seconds (s);
i - The number of test specimens, in pieces.
9.2 Method B - Absorption method
According to formula (2), calculate the water absorption rate on the front and
back of the sample, respectively. The result is expressed as the average value
of the front and back; rounded to one decimal place according to GB/T 8170.
Where:
P - The water absorption rate of sample, %;
m0 - The mass of the sink before the test, in grams (g);
m1 - The mass of the sink after the test, in grams (g);
d - The density of the water used for test, in grams per milliliter (g/mL).
10 Test report
The test report shall include the following:
a) Standard number and method;