AATCC 119:2004 pdf download.Color Change Due to Flat Abrasion (Frosting): Screen Wire Method
7.3 Insert circular frosting specimen lolder in surface abrasion head, place the metal O ring over specimen holder, and louk in place with screw collar.
7.4 Place the test specimen face up and centrally over the specimen holder, and then place the conical mounting piece over the specimen. (This mounting picce holds the specimen over the foam rubber cushion and facilitates the insertion of the rubber O ring over the test specimen into the groove. The rubber O ring holds the sample firmly in place without distortion during the test.) Insert the rubber 0 ring over the specimen into the groove, and remove the mounting piece.
7.5 Replace the surface abrasion head holding the test specimen onto the recip- rocating table.
7.6 Attach the stainless steel screen (sce 11.9) to the abradant plate by clamp- ing screen ends in the abradant plate. Ap- ply necessary tension by means of the Iiront tension clamp. Secure sides with sidle clamps.
7.7 Apply head weights totaling 1134 g to the balanced abradant head (see 11.10).
7.8 Adjust rotary motor pawl to rotate the surface abrasion head approximately one revolution per 100 cycles.
7.9 Gently lower the head until it con- lacts the test specimen and push the "start" button. Abrade for 1200 cycles and stop the machine.
8.1 Examine the abraded specimen un- der north sky light or an equivalent light source with illumination of at least 538 lx on the specimen surface.
8.2 Place the specimen flat on the . viewing table with the illumination over- head. The light should be sufficiently dif- fused so that shadows are not caused by viewing the specimen from overhead. The specimen should remain stationary and the viewer assume the angle of view- ing. First, view the specimen with the warp direction in the' line of sight by scanning the specimen at angles from 0.2-1.57 RAD (15-90°) overhead. Then turm the specimen and repeat for the fll- ing direction.AATCC 119 pdf download.