1. **Daily Sun Drying Method**. This is one of the most commonly used techniques for drying medicinal herbs. It works best on sunny and windy days. The herbs should be spread thinly on a mat or cement floor, allowing them to dry under direct sunlight. It's important to turn them regularly to ensure even exposure. During autumn, when nighttime humidity is high, it's crucial to bring the herbs indoors during the night to prevent reabsorption of moisture.
2. **Shade Drying Method**. Also known as the "shade drying" technique, this method involves placing medicinal materials in shaded areas such as indoors or greenhouses. The natural airflow helps remove moisture from the herbs. This approach is ideal for rainy weather or for herbs containing volatile oils that are sensitive to heat, like Ziziphus jujuba (Zaoren), Prunus armeniaca (Boziren), Anemarrhena asphodeloides, Prunus dulcis (Bitter Almond), Codonopsis pilosula, Asparagus cochinchinensis, and Cannabis sativa (Hemp).
3. **Traditional Fire Drying Method**. This is a time-honored, cost-effective way of drying herbs. Before starting, a fire pit or several rectangular fire grates should be built inside a room or greenhouse. The width of the fire area is typically around 1.5 meters, and the length can vary depending on the quantity of herbs. A small gap every 80 cm allows access for adding fuel. A stove is placed in the center, with an iron plate above the fire to protect the herbs. Once the fire reaches a height of 1.2 to 1.5 meters, horizontal steel pipes are placed every 60 cm, and a metal mesh is laid over them and covered with mud. The fire is then raised by another 60 cm. After lighting the stove, the herbs are placed in layers within the trough, not too thick—about 30 to 40 cm—and covered with sacks or straw. When steam begins to rise, the cover should be opened promptly, and the herbs should be turned frequently until fully dried. This method is suitable for herbs like Chuanxiong (Ligusticum chuanxiong), Alisma plantago-aquatica, and Platycodon grandiflorus. Careful temperature control is essential to avoid scorching the herbs and to meet their specific drying requirements.
4. **Oven and Dryer Drying Method**. This is an efficient and large-scale drying technique, widely used in commercial medicinal herb production. It offers advantages such as energy savings, independence from weather conditions, and additional benefits like insect and mold prevention. The temperature can be precisely controlled, making it suitable for all types of herbs without compromising quality. However, proper construction of drying rooms and the purchase of specialized drying equipment must follow technical specifications. It should be operated by trained professionals who understand the process. Additionally, the drying temperature and time should be adjusted according to the characteristics of each herb.
5. **Far-Infrared Drying Method**. This is an innovative drying technology that converts electrical energy into far-infrared radiation. The radiation is absorbed by the molecules in the herbs, causing molecular vibrations and rotations, which generate heat and lead to evaporation and dehydration. This method is particularly effective for seeds and rice-based herbs. Far-infrared drying can reduce energy consumption by 20% to 50%, making it both efficient and environmentally friendly.
6. **Microwave Drying Method**. This technique uses microwave energy to heat the moisture and fats in the herbs, converting them into heat for drying. Microwave drying also has antimicrobial properties, helping to eliminate bacteria and molds, ensuring the herbs meet hygiene standards and remain free from pests during storage. In China, microwave drying equipment operates at two common frequencies: 915 MHz and 2450 MHz.
High Polymer Emulsifier
1. Product name:
AKD High Polymer Emulsifier
2. Product introduction:
AKD high polymer emulsifier (instead of traditional cationic starch based) is a kind of cationic polymer product developed by our technical department,which is the initiative developed product in the market.It can not only emulsify AKD Wax,but also proteched the AKD colloid dispersion and aid retention,it also can increase AKD sizing efficiency(2%-8%).It can get the high stability and better fixing effect AKD emulsion by mechanical stirring,in the meantime it greatly decrease AKD hygrolysis during storage and sizing process.Final AKD Emulsion shelf time is about 6 months which is longer than starch emulsified AKD emulsion.The final AKD Emulsion also has quicker curing effect.
3.Specification and Index:
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Item
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Specification
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Appearance
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light yellow viscosity liquid
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Solid content
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40%min
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Viscosity,mPa.s,25°C
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2000-10000 mPa.s
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pH value
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2-5
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shelf life
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6 months
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4. Application:
This Emulsifier greatly restricts the AKD hydrolysis and the migration aptitude.It can replace the starch based emulsifier and AKD Curing Agent,at the same time decrease the AKD WAX using quantity.The final AKD Emulsion by this high polymer emulsifier can realize 80% sizing effect after paper machine,and almost totally realize after rewinding,which can let the paper immediately get the good water resistance effect,so less surface sizing agent in size press can fulfill all the sizing requirement.For detail using method,please contact Greatland Chemicals Co.,Ltd.
5. Package and storage:
It should be stored in the warehouse with dry and cool condition protected from frozen and sunlight directly. The temperature should be below 30°C.
Packing with 200kg, 1000kg/drum.
High Polymer Emulsifier,40% High Polymer Emulsifier,AKD High Polymer Emulsifier,AKD Emulsifying Agent
Shandong Tiancheng Chemical Co., Ltd. , https://www.tianchengchemical.com