AATCC 179:2019 pdf download.Test Method for Skew Change in Fabrics After Home Laundering
4. Terminology
4.1 laundering, n.—o/ textile materials, a process intended to remove soils and/or stains by treatment (washing) with an aqueous detergent solution and normally including rinsing, extraction and drying.
4.2 skew, n.—a fabric condition resulting when filling yarns or knitted courses arc angularly displaced from a line perpendicular to the edge or side of the fabric (sec ASTM D123).
5. Safety Precautions
NOTE: These safety precautions arc for infomiation purposes only. The precautions are ancillary to the testing procedures and are not intended to he all inclusive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSI IA standards and rules must also be consulted and followed.
5.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
5.2 Detergent may cause irritation. Care should be taken to prevent exposure to skin and eyes.
5.3 Manufacturer’s safety recomniendations should be followed when operating laboratory testing equipment.
10.4.1 The wrinkles in most fabrics flatten sufficiently under pressure of a measuring instrument at the time of mea-surement, so as not to cause measurement error. If the specimens are extremely wrinkled and the consumer would AL-WAYS expect to iron a garment made from the fabric, test specimens may be hand ironed prior to measurement.
10.4.2 Use safe ironing temperatures appropriate to the fibers in the fabric being ironed. See TM133, Table I, Safe Ironing Temperature Guide (see 15.1). Exert only the minimum pressure necessary to re-move wrinkles.
10.4.3 Due to the extremely high variability of hand ironing procedures performed by individual operators (no standard test method exists for hand iron-ing procedures), the reproducibility of dimensional change results after hand ironing has been found to be extremely poor.Consequently, caution is advised when comparing dimensional change re-sults after laundering and hand ironing,reported by different operators.AATCC 179 pdf download.