Belt vacuum dryer is a contact type vacuum drying equipment with continuous feeding and discharging forms. The material liquid to be dried enters the highly vacuum dryer directly through the conveying mechanism and is spread on several drying belts inside the dryer. The drying belts are driven by a specially designed rubber roller driven by a motor to move along the direction of the dryer cylinder at a set speed. Each drying belt is equipped with three independent heating plates and one cooling plate below, and the drying belt is closely attached to the heating plate and cooling plate to transfer the energy required for drying to the material through contact heat transfer. When the drying belt moves from one end of the cylinder to the other, the material has already been dried and cooled. When the drying belt folds back, the dried material cake is peeled off from the drying belt and falls into the crushing device through an up and down moving cutting device. The crushed material is discharged through two airlock type discharge hoppers. Due to the direct entry of the material into high vacuum and gradual drying over a period of time (usually 30-60 minutes), the particles obtained after drying have a certain degree of crystallization effect, and there are micro pores inside from the microstructure. After being directly crushed to the desired particle size, the flowability of the particles is very good, and they can be directly compressed or encapsulated. At the same time, due to the micro porous structure of the particles, they have excellent solubility. Moreover, the appearance of the particles is good, which can greatly enhance the grade of instant (granule) products. The belt vacuum dryer is equipped with continuous feeding and discharging at both ends of the machine body, and the batching and discharging parts can be set in a clean room. The entire drying process is completely enclosed and not in contact with the external environment, which meets GMP requirements.

The belt vacuum dryer has a wide range of applications and can be used for the extraction of the vast majority of natural products. Especially for the materials with high viscosity, easy agglomeration, thermoplasticity and heat sensitivity, which are not suitable or can not be dried by spray, belt vacuum dryer is the best choice. Moreover, the concentrated extract can be directly sent to a belt vacuum dryer for drying without adding any auxiliary materials, which can reduce the dosage of the final product and improve its quality. The product is in a vacuum and enclosed environment throughout the entire drying process, with a mild drying process (product temperature of 40-60 ℃). For natural extract products, it can maintain their color, aroma, and taste to the maximum extent possible, resulting in high-quality final products. The belt vacuum dryer can perform complete CIP in-situ cleaning, making it very convenient to perform CIP in-situ cleaning between batches and products, making product replacement very convenient, greatly reducing the labor intensity of workers, and ensuring product quality.

Several characteristics and technical parameters of belt vacuum dryer