AATCC 179 : Test Method for Skew Change in Fabrics

Описание: I explain about this:--
1. Specimen is 380X380mm and bench mark 250X250mm
2. benchmarks so that a square is formed. Label corners as A, B, C and D in clockwise direction starting with lower left corner.( Marking Method 1)
3. Laundering Procedure;-- Select washing conditions for testing
Load for laundering shall consist of all specimens in the sample, plus enough laundering ballast pieces to make a total load weight of 1.8 ± 0.1 kg
4. Add 66 ± 1 g of AATCC 1993 Standard Reference Detergent to washing
machine as directed by washing machine manufacturer’s instructions. If detergent is added directly to wash water, agitate briefly to dissolve completely. Stop agitation before adding wash load. Add wash load (test Specimens And ballast), distributing evenly around center agitator. Restart wash cycle.
5. After each washing cycle, separate tangled specimens and ballast pieces,
taking care to minimize distortion. Proceed to appropriate drying procedure.
6. Tumble dry. Place the washed load (test specimens and ballast)
in the tumble dryer, and set the temperature control to generate the selected exhaust temperature. Allow the dryer to run until the load is fully dry. Remove specimens immediately.
7. Measurement:--
After conditioning, lay each test specimen without tension on the same
surface used for marking. Use the same measuring device as for initial
marking and measurement.
8. Calculation:---- Skew Change Calculation Option 1
X = |100 × [2 (AC – BD)/(AC + BD)]|


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