1.1Gellowen dry cleaning and washing machine
1.2 Drying machine
1.3 Color gray scale
1.4 Home used sodium hypochlorite, active chlorine about 5%.
1.5 Anhydrous calcium chloride
1.6 Magnesium chloride hexahydrate
1.7 Control fiber 162
1.8 Sulfuric acid, 6N
1.9 Potassium iodide 12%
1.10 Starch, 1%
1.11 Sodium thiosulfate, 0.1 N
1.12 Distilled or deionized water
1.13 Sodium carbonate
1.14 Acetic acid
2.1 Formulate solution of chlorine 5ppm and salt 100ppm , and adjust the pH 7.0 with sodium carbonate or acetic acid to (21 ℃, that is 70 ℉).
3 Test samples
TEST sample is about 6x6cm. The total weight of the sample and control fiber should be 5.0 ± 0.25g. If it is not enough, add a variety of samples, and the samples of different color can be mixed together to make the total weight of 5.0g.
4.1 Add 5000ml of distilled water and 0.5ml sodium hypochlorite into dry cleaning steel cup. Cover and rotate for 10mins and then pour it out. (If the steel cup is not used for two weeks or used for other tests)
4.2 Prepare hard water
4.2.1 Take 8.24g of anhydrous calcium chloride
4.2.2 take 5.07g of magnesium chloride hexahydrate
4.2.3 Add 800ml of distilled water, and calcium chloride and magnesium chloride into the 1L volumetric flask , and stir to dissolve while adding water to 1L. This is the so-called hard water that can be placed for 30 days.
4.3 Dilute 51 ml of hard water with distilled water to 5100ml,and add 0.5ml of sodium hypochlorite (stored for no more than 60 days), titrating the adjusted chlorine content of 5ppm.
4.3.1 0.01N sodium thiosulfate is commercially available or diluted with 0.1N.
4.4 Adjust the pH of the solution with sodium carbonate or acetic acid.
4.5 Place the cup with 5000ml of solution in a water washing machine at a temperature of 21 ° C (70 ° F).
4.6 The sample and control fiber put into the steel cup, running 60min.
4.7 Remove the sample and roll to remove the excess solution. Rinse with distilled water and then squeeze, and place the sample on the bleached absorbent towel to dry under room temperature.
5 Color rating
5.1 Rate the control finer 162 with a gray scale. if the rating is less than 2 or 2-3 level, the test failed, if reached, then rate the color change of the sample.
5.2 Perform a color change rating with a gray scale on the sample. 1-5 level.