Vacuum belt dryer can reduce the loss rate of Chinese herbal extracts to zero

The vacuum belt dryer is a contact vacuum drying equipment with continuous feeding and continuous discharging. It can adapt to a wide range of applications and can be applied to most natural plant extracts, especially for high viscosity and easy to make dough. Thermoplastic, heat-sensitive materials, and materials that are not suitable or cannot be spray-dried, vacuum oven-dried are a good choice. Vacuum belt dryers are widely used in medical and health industries such as proteins, enzymes and other biologically active substances and herbal extracts because of their characteristics.

The vacuum belt dryer can directly send the concentrated extract to the vacuum belt dryer for drying without adding any auxiliary materials, which can reduce the amount of the final product and improve the product grade. At the same time, drying under high vacuum conditions, the drying temperature is lower, which is conducive to maintaining the original color of the extract. In addition, vacuum belt dryers are continuously fed at one end of the fuselage and discharged continuously at the other end. The ingredients and discharging parts can be set in a clean room. The entire drying process is completely closed and does not come into contact with the external environment. The request. Compared with box-type drying, spray-drying and other drying, vacuum belt drying has the advantages of thin material layer, fast drying, short heating time of materials, isolation operation, avoidance of pollution, flow operation, automatic control and so on.

It is reported that materials with a high content of polysaccharides in traditional Chinese medicines will stick to the walls of spray-drying collectors, causing difficulties in powder collection and drying failure. The loss of spray drying is large, and the powder is easily blown out with hot air, resulting in a decrease in yield. The vacuum belt drying can not only overcome the disadvantages of spray drying powder such as too fine and too dense and high temperature, but also has a loss rate of substantially zero.

Traditional Chinese medicine extraction products are mostly products of natural medicines after water extraction, alcohol extraction or other organic solvent extraction and concentration. Since the materials directly enter the high-vacuum container, they are slowly dried after a period of time, and the resulting particles after drying have a certain degree of crystallization effect. From the microscopic structure, there are micropores inside. After smashing directly to the required particle size, the particles have good fluidity and can be directly tableted or filled. At the same time, the particles have a microscopic loose structure with excellent fast-dissolving property; and the appearance of the particles is good for instant (granule) products. , can improve the grade of the product.

Vacuum belt dryer is a continuous feeding and continuous discharging vacuum drying equipment. The liquid raw material is sent to the dryer through the feed pump, and evenly distributed on the conveyor belt through the distributor, and the material boiling is reduced through high vacuum. Temperature, liquid raw material moisture evaporates at low temperature, the conveyor belt runs on the heating plate at a constant speed, evaporates and dries from the front end to the cooling output at the rear end, the heating temperature is from high to low, and the discharge end is equipped with a specific vacuum crushing device. To achieve different particle size of the finished product, the dried powder can be automatically packaged or enter the subsequent process section. Vacuum belt dryer plays a decisive role in the extraction of traditional Chinese medicine.

The author was informed that Jiangsu Pioneer Dry GZDY series vacuum belt dryers consist of liquid batching system, feed system, cloth system, correction system, heat exchange system, vacuum system, unloading system, control system and CIP online cleaning system. The drying process is characterized by its flexibility, stability, low temperature, airtight and hygienic cleanliness, the ability to preserve the active material in the product, low energy consumption, and cost savings. This product can solve the problems of high viscosity, easy agglomeration, thermoplastic and heat-sensitive materials that are difficult to dry in the past. It is especially suitable for the drying of malt beverages, fruit juice sweet drinks, plant extracts, plant proteins, animal protein and extracts of herbal extracts. It is the best choice for past viscous materials that cannot be dried by spray drying.

The vacuum belt dryer can independently control the operating parameters such as the amount of drying medium, temperature, humidity, and the exhaust gas circulation amount to ensure the reliability of the belt dryer and the optimization of the operating conditions. It is widely used in the industry. However, compared with foreign advanced technologies, there is still a certain gap between China's vacuum belt dryers. China's vacuum belt dryers should actively absorb advanced foreign technology, innovate products and improve product quality. Develop large-scale equipment, multi-functional assembly machines, improve the degree of automation control and product quality, and continue to extend the product life cycle.