Moisture regain
The weight of moisture in a fabric material as a percentage of the dry weight of the material is called moisture regain. Moisture regain is widely used in the fabric industry. Suppose the dry weight of the sample is G0 and the wet weight of the sample is Ga, then the moisture regain W is: (1) Standard moisture regain The moisture regain that the fabric material has when it reaches equilibrium in the standard atmosphere is called the standard moisture regain. The actual moisture regain of various fibers and their products changes with temperature and humidity conditions. In order to compare the moisture absorption capabilities of various fabric materials, the moisture regain is measured after a specified period of time (equilibration) under unified standard atmospheric conditions. (standard moisture regain) for comparison. (2) Official lake regain rate Weight is an important basis for trade pricing and cost accounting. Different moisture regain rates will lead to different weights. However, fabric materials are not in a difficult position in trade and cost calculation. Even under standard conditions, the actual moisture regain of the same fiber material is not a constant. In order to meet the needs of weight calculation and price verification, a standard value must be artificially specified for various fiber materials and their products. This standard value is called the official moisture regain. It should be noted that the value of the official moisture regain is purely for the convenience of work. Artificially selected, it is close to the average moisture regain under standard conditions, but is not the moisture regain in a standard atmosphere. The regulations on the public moisture regain of fabric materials in various countries are often formulated based on their own actual conditions, so they are not consistent, but the differences are not significant, and they will be revised. The official moisture regain rates of common fibers and spinning yarns in my country are shown in Table 1-9 and Table 1-10. (3) Actual moisture regain rate The actual moisture regain rate is the moisture regain rate of the fabric material in the actual environment, also known as the measured moisture regain rate. The actual moisture regain represents the moisture content of the material at that time. (4) Conventional moisture regain string of blended chemical fiber fabric yarns The conventional moisture regain rate of fiber strips or yarns made of several types of fibers blended with chemical fiber fabrics can be obtained by calculating the weighted average of the mixing ratio. The following takes blended chemical fiber fabric yarn as an example to illustrate.
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