The weight of textile materials at the public moisture regain or public moisture content is called the “official weight”, referred to as “public weight”, and is also called the standard weight “quasi-weight”.
It is suitable for the delivery and acceptance of materials, as well as for calculating the fineness and count of fiber yarns. In production, the calculation of standard weight is sometimes based on drying importance.
How to calculate the moisture regain of textile raw materials and how to measure the moisture content of yarn and cloth. In commercial trade, textile materials are not in a standard state. In addition, even if the same fiber is in a standard state, The actual moisture regain of the material is also related to the quality and impurity content of the fiber itself. For the purpose of measurement and price verification, corresponding standards must be set for the moisture regain of various fiber materials and their products, which is called the official moisture regain. It should be noted that the value of the public moisture regain is purely selected for work purposes. It is close to the actual moisture regain under standard conditions, but is not the moisture regain in standard atmosphere.
The official moisture regain rate (%) fiber of common fibers in my country (the official moisture regain rate (%) fiber official moisture regain rate)
The calculation of the conventional moisture regain of mixed raw materials of several fibers, mixed core tops or blended yarns can be calculated based on the weighted average of the blending ratio. Such as cotton: polyester blend, polyester accounts for 60%, cotton accounts for 40%. Then the public moisture regain rate in the blended yarn = =3.64%
The weight of the public weight textile material at the public moisture regain or public moisture content is called the “public weight”, referred to as “public weight”, also called the standard weight “quasi-weight” . It is suitable for the delivery and acceptance of materials, as well as for calculating the fineness and count of fiber yarns. In production, the calculation of standard weight is sometimes based on drying importance.
Moisture content = (wet weight – dry weight)/dry weight X100%.
The relationship between moisture regain, moisture content, yarn quality and spinning technology
Moisture regain It not only affects the actual weight of raw cotton and the performance of cotton fibers, but also affects the production process and finished product quality. The moisture regain of raw cotton is too high, and it is easy to become moldy and deteriorate during storage. It is easy to get kinked during spinning processes such as cotton cleaning and carding, which increases defects and the efficiency of impurity removal is also low. The moisture content of raw cotton is too low, and the fiber strength is low. It is easily broken into short fibers by machinery, which increases fly waste in the workshop and reduces the strength of the yarn. The factors that affect the moisture content of raw cotton, in addition to the temperature and humidity of the surrounding air, are mainly the maturity of the raw cotton. High maturity and low moisture; low maturity and high moisture. Low-grade cotton has poor maturity and generally has high moisture content. The moisture content of raw cotton in my country is generally 7% to 11%. The moisture content of cotton in southern cotton areas is higher, while the moisture content of cotton in northern cotton areas is lower. Generally, it is more appropriate to control the moisture content of raw cotton in the range of 7% to 9%. The official moisture regain rate of cotton is 8.5%; the maximum moisture regain rate of cotton is 10.5%. </p
