AATCC 114-2016 Chlorine, Retained, Tensile Loss: Multiple Sample Method.
6. Preparation of Samples
6.1 Normally, only the warp strength is determined. Cut the sample approximately 35.6 cm (14 in.) in the warpwise direction and 20.3 cm (8 in.) in the fill- ingwise direction. (If testing filling speci- mens, reverse these figures.)
7. Procedure
7.1 Preparation of Washing Machine. If the washing machine has been used for anything other than chlorine bleaching, operate it through a full wash cycle with water, adding 0.15% sodium tetraphos- phate at the beginning of the cycle. After the machine is free of impurities, set the machine for a Normal cycle, using one of the washing temperatures in Tables I, III or V of M6 as appropriate for the type of washing machine selected.
7.2 Chlorination. Permit wash water to enter machine to specified level. Add sufficient diluted sodium hypochlorite to wash water to obtain a bath liquor con- centration of 0.10% by weight of available chlorine. Adjust the pH to 9.5 with sodium carbonate to raise the pH or sodium bicarbonate to lower it. Add all the test samples and sufficient untreated kier- boiled bleached cotton to make a 50:1 liquor-to-cloth ratio. Run machine through wash portion of cycle.
7.3 Rinsing. After the first load of wash water has been dumped and the machine has been refilled, add 10 mL of the buffer solution (see 11.5) for each gallon of water and continue operation through the remaining rinse cycles and the final spin cycle. If there is more than one deep rinse, the buffer is added only to the first one.
7.4 Drying and Conditioning. Tumble dry the washed specimens until just dry, using one of the temperatures listed in Table VIII of M6. Transfer at once to a conditioned atmosphere at 65 ± 5% RH and 21 ± 2°C (70 ± 4°F) and allow to re- main through the scorching step and ten- sile strength testing. The samples should be conditioned not less than 4 nor more than 24 h before scorching, and not less than 16 h before tensile testing.
7.5 Preparation of Specimens for Scorching. Prepare warp specimens by carefully cutting five strips approx. 35.6 × 3.2 cm (14.0 × 1.25 in.). Ravel the 3.2 cm (1.25 in.) strips to exactly 2.54 cm (1 in.) following ASTM D5035, Breaking Force and Elongation of Textile Fabrics (Strip Test) (see 11.7). Then trim the 35.6 cm (14 in.) length of each strip to 30.5 cm (12 in.) From this set of five 2.54 × 30.5 cm (1 × 12 in.) strips, make two sets (from the same set of warp threads) of 2.54 × 15.2 cm (1 × 6 in.) raveled strip specimens by cutting the strips in two. Keep these sets separate; one set to be scorched, the other to be used as a control.AATCC 114 pdf download.