A specimen of the textile to be tested, with the adjacent fabric attached is subjected to washing under specified conditions. Te extent of any change in color and that of the staining of the adjacent fabric are assessed and the rating is expressed in fastness numbers.
There are two types of adjacent fabrics; single fiber fabric and multiple fiber fabric. In the case of multi fiber fabric only one specimen is required and in the of single fiber fabric two adjacent fabric are required.
A sample of textile in the form of fabric is in contact with a piece of specified adjacent fabrics in mechanically agitated in a soap or soap-soda solution, rinsed and dried. The change in colour of the specimen and the staining of the adjacent fabrics are assessed with a gray scales.
Sampling:
The sample should be a representative sample or one agreed to between the buyer and the seller.
Apparatus:
Launder-Ometer Washing Fastness Tester;
Water bath containing a rotor by means of which contains 500ml capacity is rotated at a speed of 40+ revolutions/ min. The containers may be stainless steel or glass.
Means of thermostatically controlling the temperature of the water bath so as to maintain the temperature at an accuracy of 40 + 2oC.
As per the specifications, the test specimens of size 10 x 4 cm is taken. Then two pieces of adjacent fabrics of 10 x 4 cm( as per the given specifications and fabrics type) are taken. Then a composite specimen is prepared by keeping the test specimen in between the two pieces of undyed cloth and stitched around at the four edges as shown in a figure.
Necessary soap soda solution is prepared as per the M :L ratio 1 :50. The specimen is kept in the container of the washing machine with the soap or soap soda solution. The containers are closed and washing is carried for 30 minutes with 40 o C. Remove the composite specimen, rinse it twice in cold water and cold running water for ten minutes.
Remove the stitches along the two long sides and one short side. Open out the composite specimen and dried it in hot air oven at 60 o C or at room temperature.
There are two types of adjacent fabrics; single fiber fabric and multiple fiber fabric. In the case of multi fiber fabric only one specimen is required and in the of single fiber fabric two adjacent fabric are required.
A sample of textile in the form of fabric is in contact with a piece of specified adjacent fabrics in mechanically agitated in a soap or soap-soda solution, rinsed and dried. The change in colour of the specimen and the staining of the adjacent fabrics are assessed with a gray scales.
Sampling:
The sample should be a representative sample or one agreed to between the buyer and the seller.
Apparatus:
Launder-Ometer Washing Fastness Tester;
Water bath containing a rotor by means of which contains 500ml capacity is rotated at a speed of 40+ revolutions/ min. The containers may be stainless steel or glass.
Means of thermostatically controlling the temperature of the water bath so as to maintain the temperature at an accuracy of 40 + 2oC.
As per the specifications, the test specimens of size 10 x 4 cm is taken. Then two pieces of adjacent fabrics of 10 x 4 cm( as per the given specifications and fabrics type) are taken. Then a composite specimen is prepared by keeping the test specimen in between the two pieces of undyed cloth and stitched around at the four edges as shown in a figure.
Necessary soap soda solution is prepared as per the M :L ratio 1 :50. The specimen is kept in the container of the washing machine with the soap or soap soda solution. The containers are closed and washing is carried for 30 minutes with 40 o C. Remove the composite specimen, rinse it twice in cold water and cold running water for ten minutes.
Remove the stitches along the two long sides and one short side. Open out the composite specimen and dried it in hot air oven at 60 o C or at room temperature.
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