Washing Fastness Tester

LAUNDER – O – METER

ð  The colour fastness of textile material is determined by way of mechanical hesitation of a specimen of textile with the piece of specified adjacent fabrics in Standard Soap Solution followed by rinsing and drying. 

ð  Thereafter, the change in colour of specimen and stains of the adjacent fabrics are assessed with standard grey scale.

Launder – o – meter is used widely for determining colour fastness of textile materials to washings. 

Features of Launder – o – meter:

ð  It is fabricated out of quality stainless steel.

ð  Possess electric heater to heat water in water bath.

ð  The microprocessor based programmer is provided for temperature control.

 ð Buzzer to indicate the completion of the process cycle or step.

Specificationsof Launder – o – meter:

Beakers (Test Vessels)	: Leak-proof Beakers with Gaskets
Standard Seal for Beakers	: Special Neoprene Gaskets
Speed of Rotation	: 40±2 rpm
Temperature Controller	: PROGRAMMABLE MEMORY BASED DIGITAL
Temperature Regulation	: PT-100 with ±2.0°C (As per I.S.O.)
Timer (Digital)	: 0-99 Minutes
Motor	: Single Phase, Geared Motor 220 Volt AC

Working

ð Precondition the main bath, choosing the temperature and time suitable for the test.

ð Fill each jar with necessary amount of Standard Soap Solution to give a liquid to composite specimen ratio of 50: 1.

ð Assuming the temperature is attained, set the timer depending on your test.

ð Open the beakers and place one composite specimen in each jar containing test liquid. Fit the beakers to their respective position by pressing against the spring and rotating it.

ð Press the start switch. After the set time is reached, the motor stops automatically with an alarm buzzer.

ð Remove all the beakers and take out the Composite Specimens and SS balls with the help of filter unit.

ð Rinse the Composite Specimen twice in cold water and then in running tap water for 10 minutes and squeeze them.

ð Evaluate the change in colour of the treated test specimen in comparison with an untreated piece of the same sample using the Standard Grey Scale for evaluation of change in colour.