AATCC 27 pdf free download

AATCC 27 pdf free download.Wetting Agents: Evaluation of Rewetting Agents.
1. Purpose and Scope
1 This test method provides a means of measuring the effectiveness of commercial rewetting agents on cofton fabrics.
2. Principle
2. I A test spec imen is padded in a water solution of a rewetting agent and dried. A drop of water is then carefully deposited on the taut surface of the specimen and the time required for the specular reflection of the water is recorded as rewetting time.
3. Terminology
3.1 rewetting agent, n.—in textile preparation, dyeing and finishing, a sur— factant which, after application and drying onto textiles, promotes rapid wetting on subsequent exposure to an aqueous solution.
3.2 wetting agent, n.a chemical compound which when added to water lowers both the surface tension of the liquid and its interfacial tension against the solid material.
4. Safety Precautions
NOTE: These safety precautions are for information purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must also be consulted and followed.
4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
4.2 Observe padder safety. Normal safeguards on pad should not be moved. Ensure adequate guard at the nip point. A foot-operated kickoff is recommended.
5. Apparatus and Materials
5.1 Rewetting agents.
5.2 Cloth, fairly heavy cotton, in the greige; cloth must not have been boiled, bleached or desized. Cotton sateen (see 9.1) is suggested for use in this test.
5.3 Small padder. A household wringer with improvised pad box is satisfactory in lieu of a small padder.
5.4 Embroidery hoop. 15.2 cm (6 in.).
5.5 Burette delivering 15-25 drops per mL.
5.6 Stopwatch.
5.7 Conditioned room in which standard temperature 21 ± 1°C (70 ± 2°F) and humidity (65 ± 2% RH) are maintained. Although satisfactory comparisons can be made in the ordinary laboratory, the results should be more reproducible under standard conditions.
6. Procedure
6.1 Application of rewetting agent—a solution of the rewetting agent is prepared by pouring 100 m1 of hot water over the required amount of the product in a small beaker or casserole. This solution is heated above 97°C (200°F) for a moment and then is diluted with hot water to a final volume of I L. The temperature of the solution in the padder box for application should be 70 ± 3°C (158 ± 5°F).
6.2 The padder is adjusted to a uniformly firm squeeze from side to side. On a household wringer it has been found that a dozen half turns of the wing nuts from the place where they just begin to take hold is satisfactory.
6.3 A strip of the selected cotton goods is padded three times through the solution of the rewetting agent. Three times through ensures thorough and uniform penetration of the cloth. The pickup should be from 60-90%.
6.4 The padded cloth is dried in air at approximately 82°C (180°F) for 30 mm.
6.5 Four strips of padded cotton are prepared for each rewetting agent representing, respectively, four concentrations for each product to be tested. Concentrations generally suitable are 2.50, 5.0, 10.0 and 20.0 g of rewetling agent per liter.AATCC 27 pdf download.