Test Method for Dimensional Changes

AATCC 135-2018t pdf free.Test Method for Dimensional Changes of Fabrics ater Home Laundering.
7.4.2 Use sale ironing tempcrtures appropriate to the fibers in the fabric being ironed. See AATCC FMl33.rest Method for Colortistness to heat: I lot Pressing, Table I. Sate Ironing Temperature Guide (sec 12.3). Exert the minimum pressure necessary to remove wrinkles.
7.4.3 Due to the extremely high s’ariability of hand ironing procedures performed by individual operators (no standard lest method exists for hand ironing procedures). the reproducibility of dimensional change resulLs after hand ironing has been found to he extremely poor. Consequently, caution is advised when comparing dimensional change results at (Cr laundering and hand ironing. reported by difThrent operators.
7.4.4 After ironing, condition test specimens as described in 6.1.6.
8. Measurement
8.1 After conditioning, lay each test specimen without tension on the same surface used for marking and measuring in 6.2 and 63.
8.2 Measure and record the distance between each pair of benchmarks to the nearest millimeter. eighth or tenth of an inch. This is measurement 13. II using a scale calibrated in percent dimensional change. measure each benchmark to nearest 0.5% or smallest increment on the scale and record the percent dimensional change directly. If using a digital imaging system. lil low in anu fact urer ‘S I flstrucLions.
8.3 Ihe wrinkles in most fabrics flatten sufliciently under pressure of a mcasuring instrumcnt at (he lime of measurement not to cause measurement bias.
9. Calculation and Interpretation
9.1 Calculation.
9.1.1 If measurements were made directly in percent dimensional change. average the measurements in each direction made on the specimens atler the first. third, or other specified number of washing and drying cycles. Calculate length and width averages separately to the ncarest 0.1 %.
A final measurement smaller than the original measurement results in a negative dimensional change, which is shrinkage. A final measurement larger than the original measurement results in a positive dimensional change, which is growth.
Interpretation.If the dimensional change afier one full laundering cycle as calculated in
is within a specification previously agreed on, continue test procedures as directed in 7.1-7.4 until an agreed upon number of cycles has been completed.
If the dimensional change after one washing, drying, and, if used, hand ironing cycle as calculated in 9.1 exceeds a specification previously agreed on, terminate the test.
Report for cach sample tested:A description or identification ofthe sample.
Evaluation was performed using AATCC TM135-2018L.
Type ofballast used, i.e, Type 1 or Type 3.
Number of laundering cycles (default is 3 cycles, see 9.2).
Laundering conditions, including washing machine cycle, wash temperature, drying procedure and tumble drying temperature, if applicable. Alphanumeric designations may be used if they are clearly understood by all parties. For example, 1-IV-A(i) indicates normal wash cycle at 49°C and Delicate tumble dry cycle.
If fabrics were distorted or wrinkled in their original state.
If fabrics were hand ironed.
Any modifications of the test method. If laundering equipment or conditions other than those specifically listed in the test method were used, they must be described in detail and noted as a modification of the standard method (see 12.9).
Report for cach direction:Direction measured, i.e.. length or width.
Average dimensional change, to the nearest 0.1%, with a minus sign (-) for shrinkage or a plus (+) sign for growth.
Number of measurements (dcfault is 9: 3 measurements on each of 3 specimens).
Distance between original benchmarks, i.c., 250 mm (Option i) or 460 mm (Option 2).
Precision. Precision for this test method has not been established. Until a precision statement is generated for this test method, use standard statistical techniques in making any comparisons of test results for cither within-laboratory or beween-laboratory averages.
Bias. Dimensional changes in automatic home laundering of fabrics can be defined only in terms of a test method.There is no independent method for determining the true value. As a means of estimating this property, the method has no known bias.AATCC 135 pdf download.Test Method for Dimensional Changes