When buying a vacuum screw dryer, the key factors to consider are vacuuming and drying time, condenser efficiency, pumping volume, etc. In addition, the composition of the moisture to be extracted is also a very important factor because it affects the operating pressure.

1. Large space requirement: They occupy significant floor space.
2. Potential for uneven drying: If not properly loaded, the material might not dry uniformly.
3. Maintenance: Requires regular cleaning to avoid cross-contamination, especially in food and pharmaceutical applications.

1. Belt dryer has transmission device, while hot air circulation oven does not, which is determined by the design principle of the equipment.
2. Hot air circulation oven loading requires manual placement of materials on the baking tray, and then placing the baking tray on the drying cart and pushing it into the oven, while belt dryer can achieve automatic drying, and the material can be dropped onto the mesh belt through the feeder.
3. Hot air circulation oven is an intermittent production equipment, while belt dryer is a continuous drying equipment.
4. Hot air circulation oven is suitable for small batch production, while belt dryer is suitable for large batch continuous production.

1.Mainly including stainless steel, carbon steel, aluminum alloy, etc. Stainless steel has the characteristics of corrosion resistance, high temperature resistance, and easy cleaning, and is widely used in the fields of medicine and chemical industry; carbon steel is cheap but prone to rust, and is generally used in occasions where drying is carried out at low temperatures; aluminum alloy has the advantages of light weight and good thermal conductivity, but has a higher cost and is generally used in the field of high-precision drying.
2.The thickness of the material is also one of the key factors to consider. For materials dried at room temperature, a thickness of about 2-3mm of carbon steel is generally sufficient; for materials dried at high temperatures, the thickness of stainless steel generally needs to be above 3-5mm to ensure its high temperature resistance.
In addition, it is also necessary to consider whether insulation materials need to be installed inside the hot air circulation oven. Installing insulation materials can improve the heating efficiency of the oven, reduce energy waste, and also reduce heat loss to ensure the temperature stability of the oven.
3.The selection of materials for hot air circulation ovens also needs to consider the nature of the materials and process requirements. For materials that are prone to explosion or combustion, stainless steel ovens can be equipped with explosion-proof devices to ens

Front-opening door, front and rear-opening door, top-opening door, lift-up door.

Choose the appropriate hot air circulation way according to the different arrangement of the baked products, such as bottom air circulation, top and bottom air circulation, front and rear air circulation, etc.

Electric heating, fuel oil heating, gas heating, steam heating, mixed heating.

Vibrating fluidized bed dryers are limited to loose powders or granular materials. They cannot directly process materials in other states, such as pastes or liquids. This limitation restricts their application range and calls for improvement and expansion.
Uneven fluidization is a common issue with vibrating fluidized bed dryers. These issues can lead to inefficient inter-phase contact, thereby affecting drying effectiveness. Additionally, uneven fluidization results in uneven distribution of material residence time within the bed layer, leading to non-uniform moisture content in the products and even causing some products to deteriorate due to over-drying.
Vibrating fluidized bed dryers consume considerable power and thermal energy. Continuous vibration requires significant electrical energy to sustain operation. Moreover, achieving drying effectiveness requires heating the drying medium to high temperatures, resulting in substantial energy consumption.

Choosing the appropriate vacuum screw dryer involves considering factors such as material properties, drying requirements, and production capacity. It is recommended to collaborate with professional drying equipment manufacturers for customized selection to ensure optimal drying performance and production efficiency.
 

The price of a vacuum spiral dryer is generally higher than that of other types of drying equipment due to its complex structure and high drying performance. However, considering its efficiency and quality drying results, investing in a vacuum spiral dryer typically provides excellent value for money.