A Tray Dryer is a batch-type drying device used in laboratories and industrial settings to remove moisture content from various materials by circulating hot air over them. It consists of a series of trays placed within a drying chamber, through which heated air is forced or naturally circulated. Tray dryers are widely used in pharmaceuticals, food processing, chemical, textile, and herbal industries, where uniform and controlled drying of solid or semi-solid materials is essential.

The fundamental principle behind a tray dryer is convection drying, where hot air transfers heat to the wet materials placed on trays, causing the moisture within to evaporate. The evaporated moisture is then carried away by the airflow, either through a vent or an exhaust system. The temperature, airflow rate, and drying time can be precisely controlled, ensuring that the products dry uniformly and safely without degradation.

Tray dryers are constructed with double-walled insulated chambers to prevent heat loss, and they often include a blower fan, heating coil (electric or steam-based), and thermostat or digital controller. The trays, typically made of stainless steel or aluminum, are perforated or solid, depending on the material being dried. The hot air is evenly distributed inside the chamber, ensuring consistent drying across all trays.

This method of drying is especially suitable for heat-sensitive materials that require slow and gentle drying. It’s also preferred for products where shape, structure, or chemical composition must be preserved. Tray dryers offer flexibility in handling different types of materials, including powders, granules, pastes, leaves, roots, and more, making them a versatile drying solution in both R&D and production environments.