Looking at the current research on the drying of Chinese herbal medicines and traditional Chinese medicines, there are the following problems:

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 active ingredients that occur with drying time are few, and there is no corresponding simulation software.

2. There is less dedicated drying equipment. Although the development and quality of traditional Chinese medicine drying equipment have been improved in recent years, on the whole, the current drying of Chinese herbal medicines is basically in the state of borrowing other materials for drying equipment, and there are few special equipments, and no serialization and standardization have been formed.

3. Little systematic research. 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.

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 relationship, and the use of a large number of experimental data, design and development of computer software to simulate the results of the comprehensive impact of different factors, so as to establish a variety of Chinese herbal medicines drying model. Through the establishment and prediction of the model, various influence factors are adjusted to find the optimal combination so that the moisture, heat, and active ingredients reach the optimal balance and drying effect.

Chinese herbal medicine drying equipment currently requires 8%~12% moisture content for dried Chinese herbal medicines and decoction pieces. The author believes that this standard is too general and does not take into account the differences between Chinese herbal medicines and Chinese herbal medicines. 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 subjects, 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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