The article is taken from the book written by Ying Chongfu, the founder of Chinese ultrasound, and some of the views are from the leading figures in the domestic ultrasonic extraction and separation industry . The founder of Chinese ultrasound said: Ultrasound refers to the sound with a frequency higher than 20khz . Generally speaking, the human ear can't hear the sound with a frequency higher than 20khz . In fact, this is only a rough number because of the range and ability of each person's hearing. are different. Since the human ear can't hear the ultrasound part, it seems that ultrasound does not occur frequently in nature. This understanding is wrong. For example, the lattice motion in a solid material, the collision of two metal sheets can emit ultrasound. The most famous of the ultrasounds in nature is the bat, which is able to shuttle freely through the dark black holes. This is the principle of ultrasonic ranging. The effect of ultrasound on the extraction solvent. When the material is put into the extraction tank and the ultrasonic wave is turned on, when the ultrasonic wave propagates in the longitudinal direction, it can cause some reactions of the extracted Chinese medicinal plant cells, and these reactions are physical changes and do not change the active components of the plant. Ultrasonic vibration can cause movement of the material inside the tissue cells, due to the slight massage ultrasound, the cell mass flow, the whole cells of micro shock, rotating, friction, thereby producing cells massage effect, the cell internal structure is changed, so that the cell walls of plant cells It becomes soft and then gives the effect of ultrasonic mechanical waves at an appropriate time, and the cell wall of the plant cell can be broken and dissolved into an organic solvent. Due to the acoustic absorption characteristics of biological tissues, part of the ultrasonic energy injected into the biological tissue will become thermal energy, and its temperature will rise, and the temperature of the extraction solvent will also increase. When the intensity of the ultrasound is constant, the temperature does not rise with the extension of the ultrasonic time, but the change in temperature rises to zero , and basically does not change. From this aspect, we can also understand that if the process of extracting a certain Chinese herbal medicine requires that the temperature is not too high, the thermal effect of using ultrasonic waves can be fully realized. I have personal experience, and the simplest ultrasonic cleaning machine is used. Open the ultrasonic cleaning machine at normal temperature without opening the heating system. After a period of ultrasonication, the temperature of the cleaning solvent can reach about 40 degrees. This is based on the specific actual situation of each customer's extraction process. Ultrasonic extraction technology extracts the active constituents of traditional Chinese medicines, firstly produces a unique cavitation effect in the liquid medium, that is, continuously generates numerous tiny bubbles with internal pressures up to thousands of atmospheres, and continuously “blasts†to generate microscopic strong shock waves. In Chinese herbal medicines, the plant cells are broken or deformed, and collapse and rupture under the action of cavitation bubbles instantaneously generated in the solvent, so that the solvent easily penetrates into the cells and dissolves the chemical components in the cells. In the solvent. Since the ultrasonic breaking process is a physical process, it does not change the chemical structure and properties of the extracted components . Through the power of the above three effects of ultrasound, the whole plant cells (animal cells) of Chinese herbal medicines are almost tossed, and the useful ingredients are not quickly surrendered, so that the active ingredients can be quickly transmitted by the action of ultrasound. Dissolved, in order to allow the active ingredients to dissolve quickly, the equipment is equipped with a stirring system to make it more uniform in the role of ultrasound. Install the liquid circulation system to extract more fully. When discharging, the oil-free clean compressed air boiling technology ensures that the dregs are not blocked. The bearing structure, fixed film systems and installation of this greenhouse is relatively simple. And due to it, raw material and manufacturing costs are affordable. Except the high strength woven film is higher, other kinds of antidrop film are economical. In general, the comprehensive cost of film greenhouse is lower 30% ~ 50% than the same size and specifications of the other types of greenhouse. Single Span Greenhouse,Greenhouse Film,Tunnel Greenhouse,Plastic Film Greenhouse JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.engreenhouse.com
First: What is ultrasound
Second : the application principle of several characteristics of ultrasonic waves in ultrasonic extraction
1 , mechanical effects.
2 , thermal effects.
3 , cavitation effect.
Detailed analysis of ultrasonic extraction principle