IQF Spiral Freezer This is a continuous freezing or cooling device that uses a conveyor belt running in a multi-tiered spiral pattern within an insulated chamber. Products move continuously on the belt and exchange heat with a forced-circulation of cold air. The biggest advantage is the ability to create long ice lengths and long residence times on a relatively small floor area.
Key specifications of IQF twisted
| Parameter | Reference range |
|---|---|
| Common power ratings | approximately 500–5,000 kg of product per hour |
| Number of floors | Approximately 12–30 stories; special configurations may have 40–45 stories. |
| Ice material | Stainless steel, usually 304 stainless steel, in mesh or self-stacking strip form; some applications use modular belts or food-grade polymers. |
| Common bandwidth | Approximately 600–1,000 mm; high-capacity models may have 1,000 mm or more. |
| Overall scheduled maintenance | Reference intervals are approximately every 3–6 months, adjusted according to running times. |
| Main equipment lifespan | Approximately 15–20 years or longer (for reference only, not a guarantee) |
When should IQF spirals be used?
IQF twisted is suitable when the chain needs Medium to high productivity, relatively long freezing times, continuous operation, or the need to save factory space.. Instead of stretching the ice horizontally, IQF twists and stacks the ice length into multiple vertical layers.
Particularly suitable for products requiring long storage times or relatively high entry temperatures: seafood, meat, poultry, processed foods, baked goods, tray-packed or packaged goods. Also suitable for small, loose products that need to freeze very quickly., IQF straight conveyor or IQF fluidized bed It might be more suitable. Detailed comparison: Twisted IQF or Straight IQF?.
What is the IQF torque capacity?
Common range in industrial food processing is approximately 500–5,000 kg/hour; Smaller systems or specialized designs may fall outside this range.
Actual capacity depends on the type and size of the product, inlet temperature, outlet core temperature, loading density on the ice, freezing time, and refrigeration system capacity. Even with the same machine, the capacity in kg/h can vary significantly between different product types.
How many layers does IQF spiral-cut food usually have?
Usually around 12–30 floors; Configurations requiring long or special dwell times can have up to 40–45 floors. The more floors, the better: the design must balance dwell time, conveyor speed, product clearance, conveyor length, spiral drum diameter, mechanical load, air distribution, and factory height.
What material is the IQF spiral conveyor belt made of, and what is its width?
Commonly available are stainless steel strips, usually 304 stainless steel, The material must be in the form of a mesh or specialized self-stacking belt. The belt material must meet food safety requirements, be corrosion-resistant, mechanically durable, capable of working at low temperatures, stable during continuous operation, and easy to clean.
The common bandwidth is approximately 600–1,000 mm, The choice depends on product size, productivity, stacking density, belt speed, turning radius, and torsion configuration. Increasing the belt width solely for productivity should not be done if the refrigeration and air distribution systems are not upgraded accordingly.
How to clean IQF spiral
The conveyor belt is very long and has many hard-to-reach areas, so hygiene must be considered from the design stage. Typical process: remove leftover product → pre-rinse → appropriate detergent → clean the belt and food contact surfaces → rinse thoroughly → sterilize as required → pre-production inspection.
Pay attention to both sides of the belt, the return belt area, the guide rails, the spiral drum, the support frame, the collection and drainage chutes. Automatic belt washing systems or CIP (Continuously Integrated Intake) systems ensure more uniform cleaning and reduce machine downtime.
Maintenance and lifespan
A single maintenance schedule should not be applied to the entire machine. A combination of daily checks, weekly/monthly maintenance, and scheduled maintenance based on operating hours or manufacturer's instructions is recommended. Items to check include: belt condition and tracking, belt tensioning system, drive system, motor, gearbox, bearings, fan, evaporator, sensors, safety system, and cleaning system.
With good design, proper load, and technical maintenance, the main equipment can serve for about 15–20 years or longer. Conveyors, bearings, guide rails, seals, motors, and gearboxes have shorter maintenance or replacement cycles.
Conclude
Spiral IQF is a continuous freezing solution when high productivity, long retention times, and space efficiency are required. When selecting, simultaneously evaluate productivity, freezing time, ice width and length, number of layers, air distribution, mechanical load, drive system, ease of cleaning, maintenance, and reliability.
Tan Long designs and installs industrial refrigeration systems for freezing lines. Contact 0933 357 058 or submit request Please provide the product type and shift production volume for consultation.
Frequently Asked Questions about IQF Twist
What is IQF twist?
It is a continuous freezing device that uses a multi-tiered spiral conveyor belt running inside an insulated chamber, allowing for long storage times in a small floor area. Also known as a Spiral Freezer or spiral freezer.
What is the IQF twisting capacity in kg/hour?
Typical output ranges from 500–5,000 kg/hour. Actual output varies depending on product type, inlet/outlet temperatures, and freezing time.
How many layers does IQF twisted have?
Typically 12–30 floors; special configurations can have 40–45 floors. The number of floors is chosen based on the occupancy time and height of the factory, not necessarily more is better.
What is the width of the IQF spiral conveyor?
Commonly available in widths of 600–1,000 mm, usually made of 304 stainless steel. For high-capacity applications or large products, belts of 1,000 mm or more may be used.
When should you choose twisted IQF instead of straight IQF?
When products require a long freezing time, high entry temperatures, or the factory space is insufficient for a straight ice sheet, small loose products that need to freeze very quickly are often better suited to straight IQF or fluidized bed IQF.
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