Test Method for Liquid Moisture Management
AATCC 195-2020 pdf free.Test Method for Liquid Moisture Management Properties of Textile Fabrics.
Before cutting specimens. launder the sample(s) according to the conditions selected from the AATCC LPI Laborato y Procedure for Home Laundering:
Machine Washing (see l3.1)or as agreed between parties. It may be suitable to test a material unlaundered or aller repealed launderings. Removal of sizing andor finishes may amxt the liquid moisture management properties of a fabric (see 13.3).
Cut five 8 x 8 cm specimens, taken diagonally across the width of a sample. to em.ure that different sets of length and width yarns arc in each specimen or from different sites on a product.
7.3 Place the specimens on a flat smooth, horizontal surface without tension bclbre testing, to condition them to moisture equilibrium in an environment controlled at 21 ± 2°C (70 ± 4°F) and 65 ± 5% RH as recommended by ASTM Dl 776. Standard Practice for Conditioning and Testing Textiles (see 13.5).
Prepare the test solution by dissolving 9 g sodium chloride (USP Grade) in I L of distilled waler and adjust its electrical conductivity to 16 0.2 milli Sicinens (rnS) at 25°C (77°F) by adding sodium chloride or distilled water as necessary. The test solution is used to provide a conductive medium for the instrument’s sensors and does not duplicate perspiration.
X.2 Follow the manufacturer’s instructions for starting the instrument, addition of the test solution, and the computer sofiware’s set up to collect test data.
Raise the upper sensor to its locked position and place a paper towel on the lower sensor. Press the lktmp” button for 1-2 mm until the amount (0.22 cc) of test solution is drawn from the container and drips onto the paper towel and no air bubbles are present inside the tubing. Remove the paper towel.
Place the conditioned test specimen on the lower sensor with the specimen’s top surface up (sec 3.8). Release the upper sensor until it freely rests on the test specimen and shut the door of the tester. Confirm that the “Pump-On Time” is set at 20 s to assure the predetenmned amount (0.22 cc) of test solution is dispensed. For each specimen, the percent (%) water content point on the graph should be 0.0 at the stall of each test to avoid erroneous test results. Set the “Measure Time” tbr 120 s and start the test. At the end of the 120 s test time, the software will automatically stop the test and calculate all of the indices.
Raise the upper sensor and remove the tested specimen.
Before inserting the next specimen. keep the upper sensor in its locked position. Dry between the rings of pins on both upper and lower sensors using White AATCC Textile Blotting Paper or a soft paper towel cut into narrow (0.5 cm) strips. Wait I mm, or longer, to ensure there is no residual test solution present on the sensors, otherwise any leftover moisture will cause an erroneous start (see 8.4). If salt deposits arc observed on the sensors after drying. use distilled water to remove.
Load a new specimen on top of the lower sensor with the fabric top surface up and repeat steps 8,4-8.6.
X.8 When testing has been completed for the day. usc distilled water to clean and purge the pump and tubing.Evaluation Measurement Units, GradinU. and Classification
Measurement units – For each sample tested, compile the avcrigc values for each measurement unit as follows:
Vetting Time — WT1 (top surface) and WTB (bottom surface),
Absoiption Rate — ART (top surface) and ARH (bottom surface),
Maximum Wetted Radius MWR1 (top surface) and MVRK (bottom surface).
Spreading Speed SS (top surface) and SS1 (bottom surface).
Accumulative One-way Transport Capability — (R). and
Overall (liquid) Moisture Management (‘apability (OMMC).
Formulae used to calculate the units of measurement shown in 9.1 are given in Appendix A.AATCC 195 pdf download.Test Method for Liquid Moisture Management