Determination of Dimensional changes on soaking in water Fabrics – other than wool

Dimensional changes on soaking in water – Other than wool

APPARATUS  

1. Container (100mm deep and sufficient  area to Sample horizontally)
2. Steel rule, graduated in millimeters.
3. Two pieces of plate glass (Each measuring at least 600 X 600 mm)                                                                       

REAGENTS                                            

1. Sodium Hexametaphosphate 
2. An efficient wetting Agent For Example – Sodium die-octyle sulpho-succinate or Dodecyl benzene sodium sulphonate. 
3. Distilled water 

NO. OF SAMPLE

• 1 (500mm X 500mm)

 Note: 

• Do not take any specimen within 1m of either end of the piece.
• Do not take sample with selvedges.
• For knitted fabrics make up the specimens in double thickness, sewing the
• Free edges.   

PEOCEDURE

1. Condition the sample to moisture equilibrium in standard atmosphere temperature 27±2^oC and HR 65± 2 %.for 24 hour. 

2. Determine the mass of the specimen.

3. Lay the conditioned specimen without stretching on the flat surface and measure and record.

4. Soak the measured specimen laid flat for two hour at 25 to 35^oC in water to which added 0.5 g/liter of wetting agent 

5. After two hour, pour off liquid remove the specimen without distortion from tray.

6. Place it flat on a towel In this process handle the specimen with care. The most convenient method is to fold the corners to the center so that whole sample on the towel.  

7. Remove the excess moisture by lightly pressing another towel on tap of the specimen.

8. Dry it room temperature and the condition it to dry side in the standard atmosphere.

9. Lay the dried, conditioned specimen on the flat surface on and remeasure and record the distances between corresponding reference points to the nearest millimeter.

10. Repeat the above procedure with the remaining test specimens.

11. CALCULATION:

                                          100 (b-a)

Dimensional change, % = ————

                                               a

         Where

                   a – Mean original dimension before treatment for each test specimen and

                   b – Mean final dimension after treatment for each test specimen

12. Calculate the Mean of dimension changes of all the specimens separately in each direction.

13. Express the Mean of dimension change, percent in each direction to nearest      0.1 percent.