At present, there are the following problems in the study of drying equipment for Chinese herbal medicines and decoction pieces: 1. Drying theory research is not deep. The interpretation and quantitative analysis of many complex changes that occur during the drying process of Chinese herbal medicines and the causes and degrees of degradation of the active ingredients with the drying time are few. There is no corresponding simulation software; there are few dedicated drying equipments. Although the development and quality of the traditional Chinese medicine drying equipment have been improved in recent years, on the whole, at present, the drying of Chinese herbal medicines is basically in the state of borrowing other materials for drying equipment, there are few special equipments, and there is no serialization and standardization; less. At present, the drying process research is mostly limited to the comparison of the working methods or the comparison of drying time and energy consumption. There are few systematic reports on the heat transfer mechanism, the change mechanism of active ingredients, the optimization of drying process parameters, and the comprehensive research on drying equipment design. It also means that there are very few researches on the drying technology of the more perfect varieties of Chinese herbal medicines.
Drug drying equipment
The drying process of Chinese herbal medicines and decoction pieces is actually a process in which the moisture, heat, and active components undergo dynamic changes. The three interact and restrict each other and then reach a relatively balanced state. The study should not only examine the factors that influence the three factors in the drying process, such as drying temperature, time, space scale, ambient temperature, humidity, air flow velocity, surface morphology, etc., but also examine the effects of these factors on the three. The process of dynamic change and mutual restraint relations, and with the help of a large number of experimental data, the design and development of computer software to simulate the comprehensive effects of different factors, in order to establish a variety of Chinese herbal medicines drying model. Through the establishment and prediction of the model, various influencing factors are adjusted to find the optimal combination, so that the moisture, heat, and active ingredients reach the optimal balance and drying effect.
At present, the moisture content of dried Chinese herbal medicines and decoction pieces is required to be 8%~12%. The author believes that this standard is too general and does not take into account the differences between Chinese herbal medicines and decoction pieces. It is well known that the types of chemical components, the types of microorganisms that may be contained, the medicinal sites, and the structure and structure of the different pieces may differ from each other. Therefore, their effectiveness, safety, and stability are affected by the degree of moisture. If you use a unified standard to request, it seems to be biased. This requires researchers to study the correlation between moisture, chemical composition and therapeutic effect. Through systematic and in-depth research, it reveals and predicts the influence of the degree of dryness on various aspects of the decoction, and formulates a reasonable and standardized variety of Chinese herbal medicine decoction pieces. The moisture content standards, thereby improving the quality of herbs.
In addition, according to the characteristics and classification of Chinese herbal medicines and decoction pieces, combined with mechanical design, computer control and other professional disciplines, the necessary parameters for the drying process should be formulated to meet the actual conditions of Chinese herbal medicines and decoction pieces and be applied to large-scale production. And easy-to-use universal drying equipment for tablets.
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Due to the differences in drug properties and chemical components contained in Chinese herbal medicines, their drying requirements are also different. Commonly used methods for drying Chinese herbal medicines fall into three categories: normal temperature drying, heat drying and low temperature drying. The concoction of Chinese herbal medicines contains a series of processing steps. Drying is an essential process to ensure the quality of Chinese herbal medicines. Drying Chinese herbal medicines is to properly treat Chinese herbal medicines under artificially controlled conditions to evaporate water to achieve the desired moisture content, inhibit biochemical reactions and propagation of molds and other microorganisms to maintain the quality of medicinal herbs. With the advancement of technology, many effective drying methods have been used in the processing of Chinese herbal medicines. The research on the drying technology of Chinese herbal medicines has also made great progress. However, there is still a lack of systematic theory, simple process design, and no special treatment for the characteristics of medicinal materials. Research and other issues. This article summarizes the main research methods and research status of drying technology for Chinese herbal medicines, and hopes to learn from the research of Chinese herbal medicines drying technology.
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