Vacuum belt drying and combination drying are the two mainstream drying methods in the industry. Therefore, this chapter also focuses on the two drying methods. The specific content is as follows: First, as for the vacuum belt drying, foreign countries Vacuum belt drying equipment has been applied to industrial production years ago, but due to the difference in concept and technical level in China, the introduction of this new drying technology has a relatively late absorption. The Bucher-Gade company in Switzerland has developed a series of belt-type continuous vacuum dryers with automatic cleaning devices. The German company Mark has been engaged in the process since 1995, which shortens the production cycle and improves production efficiency and product quality.
The vacuum belt drying technology has the following characteristics: low drying temperature. Suitable for drying heat-sensitive Chinese medicine extracts; suitable for drying and easily oxidized Chinese medicine extracts; suitable for drying high-concentration and high-viscosity Chinese medicine extracts; good product dissolution and uniformity The extracts distributed on the conveyor belt can form a porous material layer after heating and drying, and the dissolution performance of the product is significantly improved; it can be continuously operated and is suitable for large-scale production. So much love and support from large-scale manufacturers!
However, for traditional Chinese medicine extracts, the biggest problem of spray drying is that sticky walls and dry products tend to absorb moisture, and it is difficult to handle high-concentration and high-viscosity traditional Chinese medicine extracts. In response to this problem, there has been a new generation of one-step granulation traditional Chinese medicine drying towers for low-temperature drying, which can avoid hot-melt sticky walls of low-melting materials, and can effectively shoot down the attached dry powder in a boiling state of discharge. Xi Cunhai and other studies have shown that the softening point of traditional Chinese medicine extracts is lower than the inlet temperature of spray-drying, which is the main reason for the phenomenon of sticking to the wall. The CS series of traditional Chinese medicine spray dryers produced by Zhejiang Erle Drying Equipment Co., Ltd. have changed the sticky wall, moisture absorption and agglomeration phenomena encountered by traditional spray dryers, and do not add any auxiliary materials during the spraying process. Another disadvantage of spray drying is that there is an oxidation problem in heat-sensitive materials during spray drying, which needs to be paid enough attention. In addition, spray drying equipment is huge, with high structural requirements, high energy consumption, and inconvenient cleaning. Therefore, its application in drying traditional Chinese medicine extracts is still limited.
Commonly used combination dryers include freeze dryers, spray-first combination bed drying, spray-belt combination drying, microwave vacuum drying, spray freeze-drying, etc. These combined drying technologies are mostly applied to the drying of food and vegetables, and the application in the drying of traditional Chinese medicine extracts has yet to be promoted. Combination drying is one of the future development directions of traditional Chinese medicine extract drying technology.
Combined drying In industrial production, due to the diversity of materials and the complexity of their properties, sometimes a single form of drying equipment is used to dry the materials often fail to meet the quality requirements of the final product. If two or more types of drying equipment are combined, the purpose that can not be achieved by a single drying equipment can be achieved. This drying method is called combined drying. Combined drying can dry materials that are difficult to dry with a single drying method. The application of combined drying can not only save energy, but also better control the entire drying process, which helps to obtain high-quality products.
As the so-called everything has two sides, so is the mechanical equipment. Different mechanical equipment has its own advantages and disadvantages. The most important thing when choosing is to start from itself and choose the appropriate drying equipment or choose the appropriate according to the specific conditions of your industry Drying method to achieve very good results! More industry related information, all at http://ylscps.com
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