hot air tunnel dryer

A hot air tunnel dryer uses heated air circulated through a tunnel-like structure to dry materials quickly and evenly. It’s efficient for drying various products like fruits, vegetables, and grains, maintaining their quality and nutritional value. The controlled airflow and temperature ensure uniform drying, making it ideal for commercial food processing.


Introduction to hot air tunnel dryer

  1. Convection Heating: A hot air tunnel dryer uses convection heating to dry products uniformly by circulating hot air evenly throughout the drying chamber.
  2. Continuous Processing: It enables continuous drying of materials as they pass through the tunnel, increasing efficiency and throughput.
  3. Adjustable Temperature and Airflow: Operators can adjust the temperature and airflow settings to suit different drying requirements and product characteristics.
  4. Rapid Drying: The controlled hot air flow quickly removes moisture from the products, reducing drying time and energy consumption.
  5. Quality Assurance: They are designed with features to maintain product quality, such as uniform heating, gentle handling, and precise control over drying conditions.

hot air tunnel dryer hot air tunnel dryer

Hot air tunnel dryer principle

  1. Air Circulation: Hot air tunnel dryers operate by circulating heated air evenly throughout the drying chamber, ensuring uniform drying of the materials.
  2. Heating System: The dryer uses a heating system, such as electric heaters or gas burners, to generate the hot air required for drying.
  3. Conveyor System: Materials to be dried are placed on a conveyor belt that moves through the tunnel, exposing them to the hot air for a specific drying duration.
  4. Temperature Control: The dryer’s temperature is carefully controlled to match the requirements of the materials being dried, preventing overheating or under-drying.
  5. Airflow Adjustment: Operators can adjust the airflow within the tunnel to optimize drying efficiency and achieve desired moisture levels in the final product.
  6. Exhaust System: Moisture-laden air is extracted from the drying chamber through an exhaust system, maintaining the dryer’s internal environment for continuous operation.

Advantages of hot air tunnel dryer

  • Uniform Drying: Hot air tunnel dryers provide uniform drying across products, ensuring consistent quality and reducing processing time.
  • Energy Efficiency: They use efficient heating methods, reducing energy consumption and operational costs compared to other drying techniques.
  • Continuous Processing: These dryers enable continuous processing, improving productivity and reducing downtime for businesses.
  • Versatility: Hot air tunnel dryers can handle a wide range of materials and product sizes, offering flexibility in drying various products.
  • Improved Product Quality: With precise control over temperature and airflow, they help preserve the texture, flavor, and nutritional value of dried products.

Application fields of hot air tunnel dryer

  1. Food Industry: Used for drying fruits, vegetables, herbs, spices, grains, and snacks to enhance shelf life and preserve nutritional value.
  2. Pharmaceutical Industry: Employed for drying pharmaceutical powders, granules, and tablets in a controlled environment to ensure product stability and efficacy.
  3. Packaging Industry: Used to dry ink on packaging materials, such as labels, cartons, and films, ensuring quality printing and adhesion.

Technical Parameters

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