AATCC 116:2001 pdf download.Colorfastness to Crocking: Rotary Vertical Crockmeter Method
3.1 colorfastness, n.—the resistance of a material to change in any of its color characteristics, to transfer of its colo- rant(s) to adjacent materials or both, as a result of the exposure of the material to any environment that might be encoun- tered during the processing, testing, stor- age or use of the material.
3.2 crocking, n.—a transfer of colo- rant from the surface of a colored yarn or fabric to another surface or to an adjacent area of the same fabric principally by rubbing.
6.1 Verification checks on the opera- tion of the test and the apparatus should be made routinely and the results kept in a log. The following observations and corrective actions are extremely impor- tant to avoid incorrect test results where abnormal crock images can result and in- fluence the rating process.
6.2 Use an in-house poor crocking fab- ric as a calibration specimen and conduct three dry crock tests.
8.1 Prior to testing, pre-condition and condition the test specimens and the crock squares for dry crock testing as di- rected in ASTM D 1776, Conditioning Textiles for Testing. Condition each spec- imen for at least 4 h in an atmosphere of 21 ± 1°C (70 ± 2°F) and 65 ± 2% RH by laying each test specimen or crock square separately on a screen or perforated shelf of conditioning rack.
9. Procedure
9.1 Dry Crocking Test.
9.1.1 Tilt the upper half of the machine away to allow access to the base of the machine. Place a test square on the end of the vertical rod and fasten it with spring clip.
9.1.2 Hold the test specimen on the machine base at the point the vertical rod contacts the base. Tilt the upper half of the machine back to the operating posi- tion with the test square at the end of the shaft in contact with the test specimen. Place the weight supplied with the Crock- meter on the vertical shaft to give the rub- bing finger a downward force of 11.1N ± 10% (40 oz ± 10%). 9.1.3 With the left hand, hold the test specimen in position on the base. Turn the crank 20 turns with the right hand. This produces about 40 reciprocal turns of the vertical shaft.AATCC 116 pdf download.