rotary vane vacuum pump in viscose fiber production

Viscose fiber is an important variety of chemical fiber industry in China, which is second only to polyester fiber. The production process of viscose fiber generally includes such important processes as impregnation, pressing, crushing, aging, yellowing, dissolution, ripening, filtration and defoaming. The filtration and defoaming of viscose is an important process step and also an important link in the quality control of viscose filament. Only by ensuring the filtering and defoaming effect can high-quality viscose and viscose fiber be produced. This paper mainly summarizes the characteristics of viscose fiber and the practical value of rotary vane vacuum pump in viscose fiber production.

The main goals in the development of viscose industry are to improve quality, increase production and reduce energy consumption.

Viscose fiber has the following characteristics:

1. It has good hygroscopicity, and the moisture regain is about 13% under general atmospheric conditions. After moisture absorption, the fabric swells significantly, and the diameter increases by 50%. Therefore, the fabric feels hard after being soaked in water and has high shrinkage.

2. The chemical composition of cotton is similar to that of cotton, so it is more alkali resistant than acid resistant, but the alkali resistance and acid resistance are worse than cotton. The dyeability of cotton is similar to that of cotton. The thermal properties of cotton are similar to that of cotton, and the density is close to that of cotton, which is 1.50-1.52g/cm3.

3. It has good hygroscopicity, easy dyeing, no static electricity and good spinnability.

During the preparation of viscose, it contains a large number of particles, including unreacted fiber fragments, organic resins, gel particles, chelates of semi fiber and inorganic compounds, organic particles, metals, crystals, inorganic particles, ash, rust and other impurities. The more particles in viscose, especially the more large particles, the greater the influence on the spinnability of spinning and the finished product quality of viscose fiber. These impurities will cause the spinneret block, increase the breakage rate, and produce rubber block and wool during spinning, resulting in the size change.

The whole process requirements should be fully considered in the filtration of viscose. At the same time, the filtering method and suitable filter materials are also the premise to ensure good filtering effect and one of the main means to reduce consumption.

The rotary vane vacuum pump for defoaming has the characteristics of convenient operation, oil circuit structure, sewage structure and wide application range. It has a gas ballast valve, which can extract a small amount of water vapor. In addition, it also has the characteristics of automatic oil return prevention double safety device, high limit vacuum degree, which can eliminate the harmful environmental gases such as dust and impurities, and unique technical parameters.

When pouring with rotary vane vacuum pump for defoaming, it is better to control the cast iron castings above 0.02MPa. It is not allowed to adjust the control valve to produce negative pressure value. The minimum vacuum degree must be guaranteed. The purpose of this is to ensure that the vacuum degree is close, but also to ensure the stability of the vacuum degree and pumping volume. Based on these, it is more and more widely used in viscose fiber production.