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Colorfastness to Perspiration Test Process and Evaluation Procedures
The perspiration color fastness testing-equipment' target='_blank'>tester is widely used to test the color fastness of textiles to perspiration, sea water, saliva, distilled water, etc. Combine the sample with the specified lining fabric. After the test solution is processed, remove the test solution and sandwich it in the middle of the sample plate, press it for a certain period of time under the specified pressure, and dry the sample and the lining fabric respectively and observe it. Changes in color. The stainless steel sample holder can hold 20 specimens and is equipped with acrylonitrile separators. Standard weights such as AATCC, ISO, BS are also provided. It is equipped with an oven for color fastness to perspiration, and a chemical reagent kit suitable for AATCC and ISO perspiration testing, including 500g sodium chloride, 500g sodium dihydrogen orthophosphate, 500g sodium dihydrogen phosphate, 200g L-histidine salt. 1. Experimental test procedure 1. Immerse the test sample in the solution just prepared (do not leave the solution for more than 3 days, see 12.8) for 15-30 minutes, stirring and squeezing from time to time to make the sample completely wet, because the fabric Difficult to get wet, dyed test samples and undyed test sample cloths must be repeatedly operated in the test solution and on the drier to make them fully wet. 2. Once the sample is completely soaked, run it on the winder for a final operation, so that the wet weight of the sample is 2-2.5 times the original dry weight. For the soaked dyed sample, use the same size of multi-fiber test fabric on the back. If If necessary, the other side is pasted with undyed raw material, but it must be passed through the calender together, and the combined weight must be 2-2.5 times the dry weight. In a procedure where the sample does not retain this amount of solution when passing through the calender, such fabrics can be blotted with paper towels to the required humidity before testing. In order to obtain a true and consistent result, the structure of all samples in the test should be confirmed and selected, as the degree of contamination will increase with the amount of liquid left behind. 3. Put the test sample between the two sheets and insert it into the sample device. In this way, when the multi-fiber test sample is placed in the oven, the color bar is in the vertical position. 4. According to the equipment performance, use the following comparison scheme: 5. .1AATCC sweat tester: Regardless of the number of samples, put all 21 pieces into the device. After the last piece is placed, the pieces are held in place pair by pair with adjustable springs. Put 3.628kg (8Ib) on it to make the total weight under the pressure plate reach 4.536kg (10Ib), then turn the screw to lock the pressure plate in this position, remove the weights, and put the unit into the oven. 6. Sweat measuring instrument: The tablet is placed vertically between a display scale, one end is fixed with a metal piece, and the other side uses an adjustable metal piece. By adjusting the screw method, the movable piece will be pressed against the test sample to increase the pressure. 7. Place the installed sample device on 38±1°C (100±2°F) in the oven for a minimum of 6 hours. If, after this test period, the sample is still not dry, remove the sample from the sample unit and allow to air dry by a convenient method, but at a temperature not exceeding 60°C (140°C).°F). Because this simple test can be delayed for 16 hours, the test results show that after 6 hours, there is no obvious color change and pollution. 2. Evaluation of experimental results 1. Generally, the unsatisfactory color fastness to perspiration is due to bleeding or color change of the dyed material. It must be noted that there is no obvious bleeding when the color changes. On the other hand, when bleeding occurs, the color may not change, or the bleeding and color change may occur simultaneously. Certain chrome brown pigments, which can be used for standard tests, are then known for their use in showing color change and fading, which is due to their apparent ability to absorb sweat and react with a certain carbohydrate chloride dry cleaning solution. Therefore, to improve the acidic conditions, this part of the fading can be doubled after spotting with dilute hydrochloric acid (5g/l) and drying. 2. Determine the color effect of the test sample by reference to a natural color scale for color change (the use of this scale is discussed in AATCC Evaluation Procedure 1). Level 5: The natural color scale level 5 shows basically no change in color. Grade 4.5: The color change is the same as Grade 4-5 on the natural color scale. Level 4: The color change is the same as the natural color scale level 4. Grade 3.5: The color change is the same as Grade 3-4 on the natural color scale. Level 3: The color change is the same as level 3 on the natural color scale. Grade 2.5: The color change is the same as Grade 2-3 on the natural color scale. Level 2: The color change is the same as level 2 on the natural color scale. Grade 1.5: The color change is the same as Grade 1-2 on the natural color scale. Level 1: The color change is the same as level 1 on the natural color scale. 3. Use the AATCC color transmission scale or the pollution measuring scale to measure the pollution degree. (These scales are used, discussed in AATCC Assessment Procedures 2 and 3) Level 5: Little to no color transfer. Level 4.5: The color transfer is the same as level 4-5 on the smearing true color scale. Level 4: Color transfer is the same as line 4 on the AATCC Color Transfer Scale or Level 4 on the Staining Color Scale. Level 3.5: The color transfer is the same as Level 3-4 on the smearing true color scale. Level 3: The color transfer is the same as the third line of the AATCC color transfer scale or the same as the third level of the stain color scale. Level 2.5: The color transfer is the same as level 2-3 on the smearing true color scale. Level 2: The color transfer is the same as line 2 on the AATCC color transfer scale or the same as level 2 on the smudge scale. Level 1.5: The color transfer is the same as level 1-2 on the smearing natural color scale. Level 1: Color transfer is the same as line 1 on the AATCC color transfer scale or level 1 on the smudge scale. More about Color Fastness Tester: http://www.selaoduy.com/
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