What is a Tunnel Freezer?
A tunnel freezer is an essential piece of equipment in the food processing industry, designed to rapidly freeze food products while preserving their quality and nutritional value. These machines use cold airflow to quickly reduce the temperature of food, ensuring that it maintains its appearance, taste, and nutritional content.

Individual Quick Freezing (IQF) Tunnel Freezer

Definition and Working Principle
An IQF tunnel freezer uses a stream of cold air to rapidly freeze the moisture inside food products. Lowering the core temperature of the food past the ice crystal point within 30 minutes prevents the formation of large ice crystals, which can damage the food's cellular structure. This process ensures that the food retains its texture and can be stored or transported over long distances without compromising quality.

Key Features

Simple design comprising insulation systems, drive systems, and heat exchange systems.
Flexible adjustment of freezing time and temperature. Optimized evaporator coil circuits and well-designed air ducts ensure high heat exchange efficiency and enhanced refrigeration performance.
Applications

Single Spiral Tunnel Freezer

Definition and Working Principle
A single spiral tunnel freezer employs a spiral conveyor belt that moves the food continuously during the freezing process.

Key Features

Compact footprint and high freezing efficiency. Well-designed air ducts ensure efficient operation of the evaporator and air ducts, reducing maintenance and production costs.
Capable of meeting the demands of continuous high-load operations, suitable for medium to small production needs.

Applications

Suitable for batch freezing of pastries, meats, seafood, and more.

Double Spiral Tunnel Freezer
 

Definition and Working Principle
A double spiral tunnel freezer features a dual spiral design, providing higher freezing efficiency.

Key Features

Higher freezing capacity, suitable for large-scale production. Equipped with advanced automation equipment and high-precision machinery, the double spiral system can reach diameters of up to 5 meters and belt widths exceeding 1 meter, with more than 30 layers. This results in significantly higher production efficiency and output. Relatively low energy consumption, making it environmentally friendly.

Applications

Comparing IQF and Spiral Tunnel Freezers

Structure and Design
IQF vs. Spiral Freezers: Depending on the relative positions of the internal drum and evaporator, double spiral freezers have various layouts. These are typically designed based on customer production capacity and available space. Therefore, it's recommended to contact CBFI’s professional team to get the most suitable spiral freezer solution.

Application Scope and Investment Cost
Each type of freezer is suited to different production scales. For production lines with a capacity of 800 kg per hour or less, a single spiral freezer is more appropriate. For production lines exceeding 800 kg per hour, a double spiral freezer provides optimal results. You can directly consult professional freezer manufacturers to recommend the most suitable spiral freezer solution based on your capacity needs.

How to Choose the Right Tunnel Freezer
Choosing Based on Production Needs
Small-scale vs. large-scale production: For production lines below 500 kg per hour, an IQF tunnel is a suitable choice. For production lines reaching 1.5-2 tons per hour, a spiral freezer is more appropriate. If you have doubts about which capacity freezer to choose, the quickest way to resolve them is to contact a freezer supplier. Experienced and professional sales experts will address your questions and provide customized freezing solutions.

Choosing Based on Product Type
Different products like seafood, meats, fruits, vegetables, and pastries have varying freezing requirements.

Conclusion
Tunnel freezers are highly efficient and versatile machines essential for food processing. Whether you need an IQF, single spiral, or double spiral freezer, each type offers unique benefits tailored to different production needs. For the most suitable solution for your business, contact CBFI’s professional sales team and get a customized plan to enhance your food processing operations.