Belt vacuum dryer is a kind of contact vacuum drying equipment in the form of continuous feeding and continuous discharging, the material to be dried directly enters into the interior of the dryer in a high degree of vacuum through the conveying mechanism, and spreads out on a number of drying belts inside the dryer, and the drying belt is driven by the motor to move along the cylinder of the dryer at a set speed by the special rubber rollers, and there are three independent heating plates and one cooling plate under each drying belt. Under each drying belt, there are three independent heating plates and one cooling plate, and the drying belt is closely affixed with the heating plate and cooling plate, so that the energy required for drying can be transferred to the materials by means of contact heat transfer. When the drying belt moves from one end of the cylinder to the other end, the material has been dried and cooled, and when the drying belt is folded back, the dried cake is peeled off from the drying belt, and through a guillotine device moving up and down, it falls into the crushing device, and the crushed material is discharged through the two airlock-type discharging hoppers. As the material directly into the high vacuum after a period of time to gradually dry (usually 30-60 minutes), the particles obtained after drying have a certain degree of crystalline effect, and at the same time from the microstructure of the internal microporous. Directly crushed to the required particle size, the fluidity of the particles is very good, and can be directly pressed tablets or capsules, and because the particles have a microscopic loose structure, the instant solubility is very good. And the appearance of the particles is good, for instant (punch) products, can greatly enhance the grade of the product. The belt vacuum dryer is continuously feeding and discharging at both ends of the machine body respectively, and the batching and discharging parts can be set in the clean room, and the whole drying process is completely closed without contacting with the external environment, which is in line with the requirements of GMP.


Belt vacuum dryer has a wide range of adaptability for most of the extracts of natural products. Especially for the materials with high viscosity, easy to agglomerate, thermoplasticity and thermal sensitivity, which are unsuitable or unable to adopt spray drying, belt vacuum dryer is a good choice. Moreover, the concentrated extract can be directly fed into the belt vacuum dryer for drying without adding any auxiliary materials, which can reduce the dosage of the final product and improve the product grade. In the whole drying process, the product is in vacuum, closed environment, the drying process is mild (product temperature 40-60 ℃), for natural extract products, can maintain its colour, aroma and taste to the maximum extent, and get the high quality of the final product. Belt vacuum dryer can carry out complete CIP in-situ cleaning, in the batch to batch, product to product can be very convenient to carry out CIP in-situ cleaning, so that the replacement of products is very convenient, greatly reducing the labour intensity of workers, but also to ensure the quality of the product.