GB/T 22799-2019Test method for absorption of towel products (English PDF)

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.

6.1 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.

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 Method B - Absorption method

8.2.7 REPEAT the steps 8.2.2~8.2.6 for the remaining 5 test specimens. […]

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:

t - 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).