The various exquisite webbings that are usually seen go through multiple processes in the production process. In this process, due to errors caused by various reasons such as raw materials, production processes, and operations, the webbing is often in different batches, or even the same. The fabrics of the batches will vary in color. The size of the color difference of the fabric, if the color light source is different, the color environment, and the color time are different, the evaluation of the color difference is also different. Therefore, in order to accurately evaluate the color difference and ensure the consistency of the color results, when visually assessing colors, the light source specified by the customer must be selected in the standard color light box to avoid visual effects caused by non-standard light sources or different light sources. The difference.
Color fastness is the most important indicator of the quality of the webbing. The main concern is the rubbing resistance, sweat resistance, washing resistance, light resistance, and scrubbing resistance. The items to be assessed are mainly determined according to the use of the product, and special systems are made as required. The problem of decolorizing webbing produced by webbing factories can be large or small. If the webbing used for clothing accessories is decolored during washing, it will contaminate the entire garment or the laundry. A discolored webbing can give people a serious sense of disgust.
The so-called color fastness refers to the degree to which the color of dyed textiles remains fast under physical and chemical action, that is, the fastness of the color of dyed textiles to external influences is called dye fastness. Based on the color change of the sample after the test, the evaluation level of the white cloth staining degree indicates the color fastness.
Among the various items of color fastness, the most commonly used color fastnesses currently include rubbing fastness, perspiration fastness, washing fastness, light fastness, water immersion fastness, and scrubbing fastness. Items such as color fastness and weather resistance. In real life, the items to be evaluated are mainly determined according to the final use of the product. Among them, the color fastness to perspiration, dry friction, and water immersion are the items required by the basic safety technical specifications of textiles. All dyed textiles should be evaluated. In addition, the color fastness to saliva must be assessed for infant textile products.
The evaluation of color fastness generally adopts the visual evaluation method, that is, the gray sample card is used as the standard sample. Under certain light and environmental conditions, the gray card and the sample are compared with human eyes to determine the original sample discoloration and white cloth staining level number. Gray card (respectively discoloration and staining) has five fastness grades, namely 5, 4, 3, 2, 1. Grade 5 is the best and Grade 1 is the worst. In every two grades, one half grade is added, namely 4 5, 3 4, 2 3, 12, so the gray card we use daily is 5 grades and 9 grades, and the color fastness evaluation result is one of 9 grades. If the color fastness of a webbing product does not reach the level specified by the standard, the webbing product is unqualified.