Distortion Test (AATCC-179, Option-2)
Purpose
Ø To measure the warp way movement or skewness of fabric this distortion method is applied.
Method
Ø Draw a parallel line along with the selvedge apart from 20cm or 6’’ from each selvedge.
Ø Draw three square diagonally which have 25cm length of each arm.
Ø Draw three squares diagonally means draw three square in the left, middle & right side of the fabric.
Ø Join the diagonal line of each square.
Ø Make the square as A1B1C1D1, A2B2C2D2 and A3B3C3D3.
Ø Wash the fabric with 3HL.
Ø Measure the movement by the following formula.
Ø Result is read off as percentage.
Formula
Ø (A1C1-B1D1/ A1C1+B1D1) x 100 = X1 (Left)
Ø (A2C2-B2D2/ A2C2+B2D2) x 100 = X2 (Middle)
Ø (A3C3-B3D3/ A3C3+B3D3) x 100 = X3 (Right)
Result
Ø Noted if the three squares X1, X2 & X3 Distortion result is same or near to same fabric have no distortion.
Ø Point should be noted that the difference between X1, X2 & X3 should be not to be more than 3 %.
