FYI Tester Instrument

  What is sublimation fastness? Fastness to ironing（color fastness to hot pressing） Fastness to ironing refers to the degree to which a dyed fabric changes color or fades when pressed. The degree of discoloration is determined by the staining of other fabrics with the iron. Scorch fastness is graded from 1 to 5, with 5 being the best and 1 the worst. When testing the scorch fastness of different fabrics, the test iron temperature should be selected. Dry pressing Dry specimen is pressed with a heating device at a specified temperature and pressure for a specified time. Damp pressing A dry specimen is covered with a wet cotton adjacent fabric and pressed with a heating device at a specified temperature and pressure for a specified time. W et pressing The upper surface of a wet specimen is covered with a wet cotton adjacent fabric and pressed with a heating device at a specified temperature and pressure fora specified time. Sublimation fastness（color fastness to dry heat） Sublimation colo

After dyeing, the fabric’s capacity to retain its original color can be represented by evaluating various color fastness. Washing fastness, rubbing fastness, light fastness, sublimation fastness, and other fabric indicators are commonly used for assessing color fastness. The greater the fabric’s washing fastness, rubbing fastness, light fastness, and sublimation fastness, the better the dyeing fastness. The key elements influencing the aforesaid fastness are two: First is dye performance, and the second is dyeing and finishing procedure formulation. The foundation for increasing color fastness is the selection of dyes with outstanding performance, and the formulation of a suitable dyeing and finishing process is the key to ensuring color fastness. Both are necessary and cannot be overlooked. ​Washing fastness Fabric washing fastness is divided into two categories: fading fastness and staining fastness. In general, the lower the fading fastness of a cloth, the lower its staining fastnes

  What is color fastness to rubbing? Rubbing color fastness refers to the color change degree of colored textile material caused by a certain way of rubbing with the small white cloth on a specific equipment. The color fastness of textiles can be divided into two types: Dry crocking and wet crocking. The wet crocking is tested when the fabric is wet. In general, wet fabrics tend to have poorer rubbing fastness. This is because the dye hydrolyzes easily and stains the adjacent fabric more easily. However, this is not always the case. Printed fabrics, for example, may actually be better when wet than when dry. This is because, with water stains covering the printed surface, but reduce the coefficient of friction, the surface is more smooth. What does Crocking mean in fabric? In the process of manufacturing, wearing and storage of the color of the cloth, the color changes due to friction, or the color is transferred to its adjacent fabric, which is called the color fastness of friction. W

  The color fastness to rubbing of dyed products is divided into dry rubbing fastness and wet rubbing fastness. The former is to rub the dyed product with a dry white cloth to observe the color sticking to the white cloth. The latter is to rub the dyed product with a white cloth containing 100% water and observe the staining of the white cloth. The friction fading of the fabric is caused by the dye falling off under the action of friction. In addition to the action of external force, wet rubbing also has the action of water. Therefore, wet rubbing is generally about 1 grade lower than dry rubbing fastness. The  rubbing fastness  of the fabric depends on the amount of floating color, the molecular weight of the dye, the combination of the dye and the fiber, the uniformity of the dye penetration, and the particle condition of the dye on the surface of the fabric. For reactive dyes, the dyes and fibers are fully combined by covalent bonds, and the rubbing fastness is high. If insoluble az

Color fastness to light is to measure the solar resistance of dyes and materials. The test method can be either sun exposure or solar machine exposure. The fading degree of the sample after sun exposure is compared with the standard color sample. Under artificial conditions, accelerate the simulation of various textiles, clothing, dyes, plastics, rubber, plastics, automotive interior parts, geosynthetic and other materials often exposed to natural climate conditions due to the sun, rain, temperature, humidity, alternating light and shade after the comprehensive effect of its physical and chemical properties (also known as aging) test. Factors affecting color fastness to light Effect of dye concentration on color fastness to light： The color fastness of cotton fabric is related to the variety of dye. The lower the dye concentration, the worse the color fastness. The influence of pH value of fabric on color fastness to light: pH value has a great influence on the sun fastness of cotton f