Sequential Defrost (S.D.) for Spiral Freezers
Keep production running. Eliminate defrost downtime.
In high-volume food production, freezing isn’t just about temperature. It’s about consistency, uptime, and how efficiently your system performs under load.
Traditional spiral freezers require full or shift-based defrost cycles due to ice build-up from continuous heat removal. That means stopping production, warming the system, and restarting again – every time.
Sequential Defrost (SD) changes that completely.
What is Sequential Defrost?
Advanced Control Strategy
Sequential Defrost is an advanced control strategy that allows your spiral freezer to continue operating while defrosting takes place.
Instead of shutting down the entire system, SD defrosts one evaporator at a time while the others remain fully operational.
It’s a continuous, rotating defrost process happening in the background, designed to maintain performance without disrupting production.
Cold air continues circulating
The conveyor keeps moving
Your product keeps freezing—without interruption
How it works
Spiral freezers typically use multiple evaporators. With Sequential Defrost:
One evaporator enters a controlled defrost cycle
Remaining evaporators maintain required freezing capacity
System airflow and temperature remain stable
The process rotates across all evaporators over time
This ensures ice build-up is managed continuously, rather than in large disruptive cycles.
Sequential Defrost
Key Benefits
Continuous Production
No need for full system shutdowns. Production can run for extended periods without interruption.
Stable Freezing Conditions
Maintains consistent airflow and temperature across the system, leading to:
- Improved freeze penetration
- Uniform product quality
Reduced dehydration and weight loss
Increased Throughput
Every avoided defrost cycle adds productive hours back into your operation.
Example production potential:
- A system running 16 hours/day = 112 hours/week
- With SD enabling near-continuous operation = up to 168 hours/week
If your current output is 16,000 kg/day:
- Traditional operation ≈ 112,000 kg/week
- With SD potential ≈ 150,000+ kg/week
What this really means is more output—without adding equipment, labour, or floor space.
Reduced Mechanical Stress
Eliminates repeated thermal cycling caused by full defrosts:
- Less expansion and contraction
- Lower stress on components
Improved long-term reliability
SD vs Traditional Defrost
Traditional / Shift Defrost
Requires full or partial shutdown
Temperature fluctuations
Production losses during defrost
System recovery time required
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SD Solution
Sequential Defrost
Continuous operation
Stable temperatures
No production interruption
No recovery lag
With SD, defrosting becomes part of the process—not a disruption to it.
Suitable for Multiple Applications
Sequential Defrost is ideal across a wide range of frozen food applications:
Poultry and meat processing
Seafood
Ready meals
Bakery products
Fruits and vegetables
Dairy and desserts
And any process where consistency, uptime, and throughput matter will benefit from continuous defrost operation.
Why It Matters
Freezing systems are often a bottleneck in production. When they stop, everything upstream and downstream feels it.
Sequential Defrost removes that bottleneck.
You maintain consistent freezing conditions, extend operating hours, and increase overall plant efficiency—without changing your core process.
If your system didn’t need to stop for defrosting…how much more could you produce each week? For most operations, the answer is significant.
Speak to us about Sequential Defrost
Request a callback
+44 (0)1603 672 455
info@korutek.com
Korutek Engineering Ltd
Centrum, Norwich Research Park,
Norwich, NR4 7UG
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