Analysis Of Factors Leading To Variation In Cotton Reserves

In recent years, the state has reserved large quantities. cotton All stacks are stored in the cotton directly under the warehouse and in the professional cotton warehouse. The reserves of cotton are stored at least for more than half a year in the warehouse, most of which are stored for 3 to 5 years. The natural variation of these cotton will not be prevented during storage and storage, so we must pay attention to the reasons leading to the variation of cotton reserves.

1. the impact of storage conditions. Although the state has made basic requirements for the storage conditions of warehouses, some warehouses have not met the requirements in the course of storage due to personnel, venues and economic conditions. If there is no storage of linoleum cloth or storehouse leakage outside the storehouse, the cotton will be caught in the rain. If the staff are not nervous or responsible, they should not check the temperature and humidity every day. According to the weather changes and the difference of temperature and humidity inside and outside the warehouse, we should take measures such as ventilating and dispersing the warehouse or closing the warehouse in time. We can not ensure that the temperature in the library is below 30 C, the relative humidity should not exceed 70%, and the moisture regain of cotton should not exceed 10%.

2. the influence of temperature and humidity. Under normal circumstances, the new cotton with a moisture regain of less than 10.5% is placed in a warehouse that meets the reserve requirements. But after the summer rainy season, especially when the summer temperature exceeds 35 degrees, plus the moisture absorption property of cotton, the reflectance and yellowness of cotton will naturally change, and directly affect the cotton grade. Generally speaking, in a cotton year, the average level can be reduced by one level. The cotton with more than 3 grade is relatively stable and the variation is small. The cotton below grade 4 is unstable in quality, prone to natural variation, and has a larger downgrade. The rate of mutation begins slowly, and the mutation speeds up in the middle. After a certain period of time, the variation speed becomes slower.

3. the influence of microorganisms. Microbes grow quickly on cotton and are constantly secreted in moist environment. fibre Enzymes and acids lead to deterioration and discoloration of cotton. When the temperature exceeds 35 and humidity is more than 70%, cotton will soon become "tinea versicolor" and will be yellow stained cotton in 3 years.

4. the influence of maturity. During the inspection, it was found that the cotton index with relatively high maturity index was relatively small, and the cotton maturity index was small. The results showed that the variation of cotton grade 3 or above was relatively small and the 4 grade variation was larger.

5. the impact of storage time. Flower storage and cotton preparation The longer the time, the more cotton will lose its original luster and make the cotton more and more yellow. Therefore, the longer the storage time, the greater the variability of cotton.

6. the influence of plastic bags. During the inspection, it was found that the plastic bag with rain had a large variation. In order to reduce costs, some manufacturers are unreasonable in formulation and use recycled materials to produce plastic bags. In addition, the air permeability of plastic bags is poor. Once the rain and snow enter the transportation and storage process, the water is difficult to evaporate, resulting in mildew of cotton bags.