After several years of development, air source heat pump drying has been widely used in the field of Chinese herbal medicine processing, and its advantages of safety, environmental protection and energy saving have also been well demonstrated. Chinese herbal medicine drying can be generally divided into one drying and secondary drying. They are different for the customer group. The corresponding drying process also has this certain difference. The distributor needs to treat it differently to avoid the drug in the drying process. Reduce the phenomenon of quality and decline, follow Dongguan Kexin New Energy Equipment Co., Ltd. to learn it!
Once dried as raw material, secondary processing is required
Chinese medicinal materials include roots, stems, leaves, fruits, seeds, and skins. In addition to a small number of Chinese medicinal materials recovered for fresh medicinal use, other materials need to be processed dry for storage. "Where the drug storage should be guarded against dryness, tyranny, and drying without drying it, then the erosion of the scale and decay is inevitable," that is, drying is the most common and critical processing of Chinese herbal medicines and Chinese herbal medicines after harvesting. The drying process is an important part affecting the quality and economic value of Chinese herbal medicines. The drying effect directly affects the use, quality and appearance of the products. Most Chinese herbal medicines have higher water content after harvesting, generally reaching more than 70%. In the process of processing, transportation, storage and sales, and various links, mold, mites, discoloration, etc. often occur, and it is not suitable for long-term preservation. The medicinal active ingredients will also be decomposed and lost, seriously affecting the quality and efficacy of Chinese herbal medicines. According to statistics, especially in tropical and subtropical regions, the loss ratio is as high as 35% to 45%.
In order to allow Chinese herbal medicines to be stored for a long time and to ensure their medicinal value and curative effect, it is necessary to dry the Chinese herbal medicines in a timely and effective manner. Then, the process of drying the harvested Chinese herbal medicines is once drying. The main purpose of drying is to extend the storage time of Chinese herbal medicines, to ensure their shape and color, and to prepare for the next secondary processing, because the Chinese herbal medicines are mostly used as pieces or powder. Many Chinese herbal medicines need to be cut in secondary processing, such as slicing, dicing, etc., so it is necessary to ensure a certain humidity, so as not to break during the cutting process, and ultimately affect its value.
The drying of Chinese herbal medicines is affected by factors such as shape, size, thickness, light weight, texture and composition. The drying process of different products is different. According to the different materials, in the case of ensuring the quality of the drying, try to choose a higher drying temperature to speed up the drying speed and reduce the running cost. For example, the sand ginseng has a high water content, and the dewatering rate after drying is generally about 50%. Taking 1200 kg of fresh ginseng as an example, after the previous cooking and peeling, drying, 5 sets of 5P closed dehumidifying drying equipment are arranged, the drying time is about 20 hours, the starting temperature It is 38 Â° C and the maximum temperature is 64 Â° C.
It is necessary to pay attention to the drying of Chinese herbal medicines. The temperature should not be too high, usually drying at medium temperature to avoid the loss of the medicinal ingredients due to high temperature. The primary drying is mainly for the growers and cooperatives of some Chinese herbal medicines, which are convenient for storage and sale after drying.
The second drying is mostly Chinese herbal medicine pieces with low water content.
The secondary drying generally refers to the secondary drying of the dried raw materials before the processing of the Chinese medicinal materials, and the objects to be dried are mostly Chinese medicinal pieces. After the Chinese medicinal materials are dried once, they need to be soaked, cleaned, cut and other processes during processing and sales, and then subjected to secondary drying (some Chinese medicinal materials do not need to be soaked and cleaned).
The water content of Chinese herbal medicines after drying is generally about 10%, such as red dates controlled at about 12%, Codonopsis 11% to 15%, bitter almonds 6% to 8%, northern sand ginseng 12% to 15%, and astragalus 11%. 14%. The material placement method adopts movable material rack and material metal tray. The thickness of the material placement can not exceed 20mm, and the distance between layers is 150mm. This is the distance that is beneficial to the effective drying of the medicine. In principle, when Chinese herbal medicines are dried, a single variety is required, and it is not possible to mix and dry together.
Taking the secondary drying of astragalus as an example, it is necessary to slice the astragalus before drying, then soak it with water, wash it off and put it into the drying room for drying. The initial moisture content is about 45%, after drying. The water content is required to be between 9% and 11%. In the environmental conditions of about 10 Â° C in winter, the closed dehumidification drying equipment is used, the drying time is about 12 hours, and the drying temperature is maintained between 38 Â° C and 55 Â° C. The secondary drying of Chinese herbal medicines requires a slow temperature rise, and the maximum temperature generally cannot exceed 65 Â° C to prevent the Chinese herbal medicines from breaking due to excessive temperature or too fast temperature rise. The secondary drying of Chinese herbal medicines is mainly for the processing of some Chinese herbal medicines and large Chinese medicine shops. The dried Chinese herbal medicines can be directly sold.
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