Test on dimensional changes of woolen fabrics after washing

The smallest shrinkage rate is found in synthetic fibers and blended fabrics, followed by woolen fabrics, linen fabrics, and cotton fabrics in the middle. Silk fabrics have a larger shrinkage, and the largest shrinkage rates are viscose fiber, artificial cotton, and artificial wool fabrics. The dimensional change test of wool fabrics after washing can determine the relaxation dimensional change rate and felted dimensional change rate of wool textile products after washing.
Zhongke Testing Reliability Experiment Center has the capability of reliability testing of various textiles and provides professional dimensional change testing services for woolen fabrics after washing.

is suitable for washable (hand or machine washable) wool knitted products and wool woven fabrics.

After the sample undergoes the specified washing procedure, the dimensional changes before and after washing are measured, and the relaxation dimensional change rate, felted dimensional change rate, total dimensional change rate, etc. are calculated.
1) Relaxation dimensional change rate: the dimensional change of the sample after the relaxation washing process as a percentage of the original size.
2) Felt dimensional change rate: the dimensional change of the sample after the felting and washing process as a percentage of the size before the felting and washing process.
3) Total dimensional change rate: the dimensional change of the sample after relaxation and felting washing procedures as a percentage of the original size.

FZ/T 70009-2012 Test method for relaxation dimensional change rate and felting dimensional change rate of wool textile products after washing
GB/T 6529 Textiles Standard atmosphere for humidity conditioning and testing
GB/T 8170 Numerical rounding rules and representation and determination of extreme values
GB/T 8629-2001 Textiles - Test household washing and drying procedures
FZ/T 70008 Test method for knitting density coefficient of wool knitted fabrics