Determination of color fastness to hot press in fabrics
  • Determination of color fastness to hot press in fabrics

     

     

    Ironing fastness of dyed and printed textile products is done to determine the degree of resistance of dyes to ironing or rolling during manufacturing.

    Separate tests are carried out for dry, moist and wet textile materials. ( TS 472 EN ISO 105-X11 )

     

    Used materials

     

    Press Ironing device (Features; with a smooth surface double plate, 4 kPa pressure able to apply), Heat resistant layer, Filling (Features; It is made of woolen flannel with an average mass of 260gr / cubic meter),

    Cotton fabric (Properties; Undyed, bleached, 100-130 gr/cubic meter mass, smooth surface)

    Cotton accompanying cloth (100 mm x 40 mm in size), Gray scale, Class 3 water.

     

    sample preparation

     

    The fabric sample to be used in the experiment is prepared in dimensions of 100 mm x 40 mm.

     

    Experimental Procedure

     

    The pressing temperature varies according to the type of fiber that makes up the fabric. If the fabric consists of a mixture of different fibers, it is determined according to the fiber with the lowest heat resistance. The most used pressing temperatures are:

     

    110 ± 2 ˚C

     

    150 ± 2 ˚C

     

    200 ± 2 ˚C

     

    Before the test samples are subjected to the test, they are conditioned under standard temperate atmosphere conditions (65% ± 2 relative humidity and 20 ± 2 ˚C temperature). The bottom layer of the pressing device is covered with heat resistant layer, wool flannel padding and undyed fabric.

     

    Dry Pressing:

     

    The dry test sample is placed on the cotton fabric. The top plate of the pressing device is lowered and the dry test sample is treated for 15 seconds at the specified temperature. The color change in the test sample is evaluated with gray scale in two different ways.

     

    a) Immediately after the test,

     

    b) After waiting for 4 hours under standard atmospheric conditions.

     

    Color bleeding on the undyed fabric is detected with the gray scale (indicator chart).

     

    Moist Pressing:

     

    The accompanying cloth with dimensions of 100 mm x 40 mm is immersed in water and squeezed enough to hold its own weight in water. The dry test sample is placed on the undyed cotton fabric on the padding, and the wet accompanying cloth is placed on them. The top plate of the pressing device is lowered and the dry test sample is treated for 15 seconds at the specified temperature. The color change in the test sample is evaluated with gray scale in two different ways.

     

    a) Immediately after the test,

     

    b) After waiting for 4 hours under standard atmospheric conditions.

     

    Color bleeding on undyed fabric is detected with a gray scale.

     

    Wet Pressing:

     

    The test sample and the accompanying cloth of 100 mm x 40 mm are immersed in water and squeezed enough to hold its own weight of water. The wet test sample is placed on the undyed cotton fabric on the padding, and the wet accompanying cloth is placed on them. The top plate of the pressing device is lowered and the wet test specimen is treated for 15 seconds at the specified temperature. The color change in the test sample is evaluated with gray scale in two different ways.

    a) Immediately after the test,

    b) After waiting for 4 hours under standard atmospheric conditions.

    Color bleeding on undyed fabric is detected with a gray scale.

    Rubbing staining of the tested sample is checked and evaluated using the Gray scale. Two types of gray scales are used for the rubbing fastness test. One of them is 2 scale. The lowest fastness value is 5 and the highest fastness value is 1. The other gray scale is 5 scale. In this scale, the lowest and highest fastness values ​​are the same as in the 9-scale scale. However, there are intermediate values ​​between each value. Therefore, more precise measurements can be made. Fastness values ​​in 5 scale gray scale are as follows.

     

    1 Lowest fastness value

    1-2

    2

    2-3

    3

    3-4

    4

    4-5

    5 Highest fastness value

     

    Determination of color fastness to hot press in fabrics
    Posted by %PM, 09% 806% 2016 21%:%Jun in Quality control Read 3633 times

Determination of color fastness to hot press in fabrics