Moisture regain rate of textile materials
Moisture regain rate of textile materials
Textile materials include textile raw materials processed into textiles and textile semi-finished products, such as various fibers, slivers, yarns, fabrics, etc. The hygroscopicity of textile materials is an important characteristic related to material performance and processing technology. The hygroscopicity of textile materials is usually expressed by moisture regain and official moisture regain. These basic quality indicators play a very important role in the commercial trade, performance testing and textile processing of textile materials.
Moisture regain and official moisture regain: The moisture regain of textile materials is the percentage of the amount of water adsorbed in the sample to the dry weight of the sample.
The moisture regain of textile materials varies from time to time, as does their weight. In order to eliminate the difference in weight caused by different moisture regain rates and meet the needs of textile material trade and inspection, the country has stipulated corresponding standards for the moisture regain rates of various textile materials, which are called official moisture regain rates. It is numerically close to the equilibrium moisture regain measured under standard temperature and humidity conditions.
It should be noted that the regulations on the public moisture regain of textile materials in various countries are often based on their own actual conditions, so they are not completely consistent.
The moisture regain of textile materials is usually tested using the oven method. It uses resistance heating in the oven to bring the temperature of the air in the oven to a certain value, and maintains this temperature during the entire drying. Then the weighed textile material sample is placed in a constant temperature oven for drying. Drying, the moisture in the textile material continuously evaporates into the hot air, and the exhaust device of the oven is used to continuously discharge the hot and humid air out of the box, creating conditions for the moisture contained in the textile material to continuously evaporate. As the moisture contained in the textile material continues to evaporate and lose, the weight continues to decrease. When the weight is dried until it remains unchanged, it is the dry weight of the textile material. At this time, the dry weight of the sample can be obtained by using an in-box thermal weighing method, and then the moisture regain of the textile material can be obtained based on the wet weight and dry weight of the sample. In the oven method, the drying temperature is specified as 105℃±3℃ for cotton; 105~110℃ for wool and most chemical fibers; and 140~145℃ for silk. The drying time is generally 90 minutes. In addition, the moisture regain of textile materials can also be measured using the resistance wet method. The resistance wet method is based on the different resistivities of textile materials at different moisture regains, thereby measuring the moisture contained in textile materials. JKrS0aR
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