AATCC 158:2000 pdf download.Dimensional Changes on Drycleaning in Perchloroethylene: Machine Method
7.2 Cut fabrics into test specimens preferably not smaller than 500 x 500 mm and stitched on all sides with polyes- ter thread to prevent ravelling.
7.3 Carefully open elastic circular knits by cutting in the direction of the ribs without causing distortion. After marking and measuring according to Section 8, re- store the circular state by sewing together the cut edges. After the test, the seam shall be cut again and distances between markings determined in the open state. 8. Preparation of Specimens 8.1 Condition the test specimens and dummy load from the dry side at 21± I°C(70±2°F)and 65±2% RHbylay- ing each test specimen separately on a flat, smooth, horizontal surface for at least 24 h.
8.2 When marking fabric specimens, lay out the specimen without tension on a flat, smooth surface, taking care to see that it is free from wrinkles and creases. Making three pairs of marks, each at least 250 mm apart in the length direction, and three similar pairs of marks in the width direction of the fabric. If the specimen is a garment, mark and measure different parts of the outer fabrics and linings sepa- rately.
9. Test Procedures 9.1 Procedure for normal materials.
9.1.1 The mass of the complete load shall be 50±2 kg for each cubic meter of the volume of the inner cage. Ensure that the mass of the textile part of the test specimen(s) is not more than 10% of the total load, the remainder consisting of the ballast unless the mass of the test piece of garment as such exceeds 10% of the total load.
9.1.7 Dry the load in the machine or in a separate drying tumbler, by tumbling in circulating warm air for an appropriate time, preferably using an automatic sol- vent-dryness control. Either the outlet air temperature shall not exceed 60°C . (140°F), or the inlet temperature shall not exceed 80°C (176°F) (see 13.4). After drying, blow air at ambient temperature through the rotating load for 3-5 min.
9.1.8 Remove the specimens from ma- chine immediately. Place garments indi- vidually on hangers and place fabric specimens on a flat surface for not less than 30 min before finishing. NOTE: If additional information on stability to drycleaning only is required, condition and remeasure the specimen at this stage before completing the proce- dure. Note details of this procedure in the test report.AATCC 158 pdf download.