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The colorfastness tester for rubbing leather is used to test the colorfastness to dry and wet rubbing of various types of leather. It is a testing device for evaluating the quality of leather products. QINSUN is the manufacturer Welcome to customers who need to ask questions.
Leather is a fabric that is sensitive to color migration. Color migration not only affects the inherent color of the leather, but also the color of objects that come into contact with it, resulting in obvious product quality defects.
Experimental Process:
1. Determination of Leather Color Migration
Currently, there are ISO 15701 and ASTM D5552 standards for the detection method of color migration in leather. Among them, ISO 15701 uses polyvinyl chloride film as the color bonding material, while ASTM D5552 uses white cotton liner as the color bonding material, which must be soaked in distilled water before use. For comparisonking: The operation of ISO 15701 is simpler and it is also widely adopted by tanneries. This method is used in this experimental operation.
Working Process:
Cut the sample (20mm × 30mm) with a die and stick the tested surface of the sample on the polyvinyl chloride film (PVC for short, 50mm × 30mm) , place the tested side down, place the sample in the middle between two peeling plates, place the plate in the device and place a 4.5 kg weight on it, gently rotate the device while maintaining pressure and move the weight. The code keeps the sample at an average pressure of 750 g/cm2 during the test, place the device in the oven, the temperature of the oven should be within the range of (50 ± 2) ° C, and place it for 16 hours. Remove the sample from the device and place it at room temperature to cool, then separate the sample and the PVC sheet and use the gray scale to determine the color of the PVC sheet.e to evaluate.
The rating results of color plaques are given in accordance with the requirements of IOS 251 and are divided into 5 grades, of which grade 5 indicates no color plaques and no color migration, and grade 1 indicates severe staining and color migration Significant
2. Determination of color fastness of leather to wet rubbing
Determination of color fastness of leather to wet rubbing rubbing is in accordance with the requirements of QB /T 2537.
Operating Process:
Attach the white felt soaked and pressed in deionized water to the test head (500 g) of the rubbing color fastness tester and place the leather sample Fix it on the test table of the instrument, with the smooth side up, and stretch 10% along the friction direction; lay down the test head with felt, start the instrument, stop after 250 times, remove the feltt and check the felt according to the requirements of IOS 251 Sticky color for classification.
