When dealing with heat‑sensitive, oxygen‑sensitive, or valuable materials that must maintain their physical structure, the Tray Vacuum Dryers — specifically the Square Vacuum Dryer — stands out as the industry's gold standard.
Unlike dynamic dryers that subject materials to mechanical stress, our square vacuum tray dryer offers gentle, static drying under precisely controlled conditions. It is the ideal solution for materials that are fragile, easily oxidized, or prone to decomposition at high temperatures. Whether you are drying pharmaceutical APIs, fine chemicals, or food products, this equipment ensures your final product retains its original integrity.
A Tray Vacuum Dryer (often referred to as a Square Vacuum Dryer or Box‑type Vacuum Dryer) is a conduction‑heated drying system. The process involves placing materials on trays inside a sealed, square‑shaped chamber. The chamber is then heated via hot water, steam, or thermal oil circulating through internal shelves or heating pipes, while a vacuum pump simultaneously removes moisture and volatile solvents. This combination of heat and vacuum significantly lowers the boiling point of water, allowing for rapid and efficient drying at low temperatures.
Square Vacuum Chamber: Maximizes internal space utilization and allows for easy integration into production lines.
Heated Shelves/Trays: Provide uniform conduction heating across the material.
Vacuum System: Removes evaporated solvents and lowers the boiling point.
Condenser (Optional): Allows for the recovery of valuable organic solvents.
Our square vacuum dryers are engineered to solve the most common challenges in industrial drying. Here's why they are the preferred choice for high‑value applications.
Protection of Heat‑Sensitive Materials
By creating a strong vacuum (up to -0.1 MPa), the boiling point of moisture is drastically reduced. This allows for low‑temperature drying (typically 40°C to 150°C). This process prevents the decomposition, oxidation, or degradation of thermosensitive materials, which is crucial for pharmaceutical and food‑grade products.
Preserving Material Structure (Static Drying)
Because the material remains stationary on the trays, there is no mechanical agitation or friction. This makes the Tray Vacuum Dryer ideal for fragile crystals, granular materials, and materials that require a specific physical shape or structure to be maintained throughout the drying process.
Excellent Solvent Recovery
If your process involves expensive solvents or hazardous chemicals, the equipment can be equipped with a condenser. The vacuum system extracts the evaporated vapors, which are then condensed and collected, offering significant cost savings and environmental protection.
Uniform Drying Performance
Our design features multiple vacuum extraction points (typically four points) to ensure uniform vacuum distribution across the chamber. This prevents temperature gradients and ensures all trays dry at a consistent rate. Additionally, the square design allows for precise air and heat flow management, enhancing temperature uniformity.
Meets GMP Standards
The equipment is available in SUS304 or SUS316L stainless steel, with a polished internal finish (Ra 0.4‑0.6) and seamless, arc‑shaped welds that prevent material accumulation. This design ensures easy cleaning and sterilization, meeting cGMP (Current Good Manufacturing Practice) and FDA requirements for sanitary processing.
Our standard FZG Series Square Vacuum Dryers are designed for high‑capacity production. Below are typical parameters for the popular FZG‑20 model:
| Parameter | Specification |
| Model | FZG‑20 |
| Internal Chamber Dimensions | ~1550 × 1500 × 1230 mm |
| Number of Trays | 48 pcs (Standard size: 640×460×45mm) |
| Heating Layers | 12 Layers |
| Temperature Range | -35°C up to 150°C |
| Ultimate Vacuum | ≤ 1333 Pa (adjustable) |
| Construction Material | SUS304 / SUS316L Stainless Steel (Internal & External) |
| Heat Source | Hot Water, Low‑Pressure Steam, or Thermal Oil |
Custom sizes and configurations (e.g., explosion‑proof, enhanced solvent recovery) are available upon request.
Our Square Vacuum Tray Dryers are trusted across a wide range of demanding industries:
Pharmaceutical Industry: Drying of active pharmaceutical ingredients (APIs), injectable powders, antibiotics, enzymes, and vitamins.
Chemical Industry: Drying of dyes, pigments, catalysts, high‑purity chemicals, and polymer intermediates.
Food Industry: Dehydration of health food ingredients, seasonings, and dehydration of heat‑sensitive additives.
New Energy & Electronics: Drying of battery materials (e.g., lithium battery components), electronic substrate materials.
Agrochemicals: Drying of pesticides and herbicide intermediates.
| Feature | Square Vacuum Tray Dryer (Static) | Dynamic Dryers (e.g., Double Cone, Paddle) |
| Material Movement | Stationary – No product degradation due to friction. | Active – Products are tumble/mixed. |
| Structural Integrity | Excellent – Keeps crystals and granules intact. | Moderate – May cause attrition or dust formation. |
| Solvent Recovery | Optimal – High condensation efficiency in static environment. | Good – Can be difficult to handle with volatile dust. |
| Sanitary Design | cGMP Compliant – Easy to clean, no dead corners. | Complex – Harder to clean shafts and seals. |
The Tray Vacuum Dryer is more than just drying equipment; it is a guarantee of product integrity. For manufacturers looking to process delicate materials without compromising on quality, efficiency, or safety, this technology is indispensable. Our Square Vacuum Dryers combine decades of engineering expertise with robust stainless‑steel construction and precise controls to deliver consistent, high‑quality results, batch after batch.
Ready to optimize your drying process? Contact our sales engineering team today to discuss your specific material properties and capacity requirements. We can provide customized solutions for your unique application.
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