Several kinds of drying methods for commonly used Chinese herbal medicines

1. Daily selenium method. This is a common drying method for most medicinal herbs. Choose sunny, windy weather, spread the herbs thinly on the mat or on the cement floor, use the sun to dry, and pay attention to turning in time to ensure uniform sunlight. When drying in the autumn, because the humidity of nighttime air is large, it is necessary to pay attention to retracting and picking up the medicinal materials to prevent them from returning moisture.
2. Spreading method. This method is also called shade dry method, which means that the medicinal materials are placed in the shade of indoor or greenhouses, and the flowing air is used to blow off the water to achieve the purpose of drying. This method is often used in rainy weather, or used in medicines containing volatile oils and oils that are easy to take off and change color, such as Zaoren, Boziren, Anemarrhena, Bitter Almond, Codonopsis, Asparagus, Hemp and so on.
3. Drying method. This method is a traditional, simple and economic method of drying herbs. The application of this law must be in advance in the room or inside the greenhouse base 1 or several rectangular fire gongs, fire enthalpy width of about 1.5m, the length can be determined according to the number of herbs, under the fire chant every 80cm to leave a small switch to open the door to add fuel. Afterwards, a stove is placed in it, and an iron plate is needed at the crater of the stove to raise the fireproof seedlings, bake bad herbs, and disperse heat. When the barrier reaches a height of 1.2 to 1.5m, a circular steel pipe with a diameter of 3 to 4cm is horizontally placed every 60cm. A metal wire mesh is laid on the steel pipe, and the mesh is covered with mud, and then the height of the fireball is increased by 60cm. . Ignite the stove and dry the fire and the covered mud. Place the herbs in large and small layers in the gutter, but do not overfill it. Use 30 to 40cm thick, covered with sacks, straw, etc. When a large amount of steam rises, it is necessary to open the sack or straw curtain in time, and pay attention to flipping up and down the herbs until it is dry. This method is applicable to the drying of medicinal materials such as Chuanxiong, Alisma, and Platycodon. Drying process should pay attention to the control of the heat, so as not to scorch the herbs, but also according to the special requirements of different herbs, respectively, to grasp the degree of dryness.
4. Drying oven and dryer drying method. This method is suitable for the use of large-scale medicinal planting bases. It has high efficiency, labor saving and provincial expenses. It is not limited by the weather, but also has the effect of insecticidal and mold-proof. The temperature is controllable, and it is applicable to all kinds of medicinal materials without affecting it. Herbal quality is a more advanced method of drying. However, it is necessary to pay attention to the construction of drying rooms and the purchase of special drying machines in accordance with the technical requirements and standards of the specifications, and they should be operated by professionals who are familiar with drying techniques. Also note that the drying temperature and time are controlled according to the different properties of the herbs.
5. Far-infrared heating drying method. This is a new drying technology. Its drying principle is to convert electric energy into far-infrared radiation, which is absorbed by the molecules of the medicinal material, generates resonances, causes vibrations and rotations of molecules and atoms, causes the objects to become hot, and undergoes thermal diffusion and evaporation. And chemical changes, eventually reaching the purpose of drying. Seed kernels and rice herbs can be dried by this method. Far-infrared drying can save 20% to 50%, with good results.
6. Microwave drying method. Microwave drying is actually heating by induction heating and medium, so that moisture and fat in Chinese herbal medicines absorb microwave energy in different degrees, and convert it into heat to achieve the purpose of drying. Microwave drying can kill microorganisms and molds, and has a disinfectant effect, so that the medicinal materials can reach the hygiene standards and can prevent molds and insects from being produced during storage. At present, microwave heating equipment produced in China has two frequencies of 915MHz and 2450MHz.

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