Seafood & Aquatic Products
Individually quick freezes fish fillets, peeled shrimp, scallops, and shellfish in an unobstructed vertical airflow zone.
Self-Stacking Spiral Freezer
Square self-stacking spiral freezers (Series S4, S6, S7, S9, and S10) remove the central drum and support rails of standard spiral freezers. Our proprietary TitanStack® belt stacks directly on corrugated interlocking side links, delivering up to 50% more freezing output in the same floor footprint.
With no central drum or rail frame, the freezing zone is almost 100% open for cleaning. Paired with high velocity centrifugal fans, Air Defrost (ADF), and automated CIP cleaning, the system runs 24/7 with minimal downtime.
TitanStack® interlocking self-stacking belt (Series S4, S6, S7, S9, S10)
18 to 50 belt tiers in widths from 420 to 1,372 mm (300 to 5,000+ kg/h)
Controlled vertical airflow with centrifugal fans, ADF air defrost, and CIP cleaning
Product Features
Why Choose Square's Self-Stacking Spiral Freezer
Key belt, airflow, and cleaning advantages of our drumless self-stacking design.
Self-Stacking Belt
Our TitanStack® belt uses corrugated interlocking side links for a larger contact area and higher structural strength, preventing belt collapse across 18 to 50 tiers. A tension-free chain drive at the base moves the belt stack smoothly without a central drum.
Self contained Freezing Zone
High velocity centrifugal fans drive cold air vertically through the entire product and belt stack. This vertical airflow path gives uniform heat transfer and keeps product temperature even across the belt.
Efficient Evaporator
Designed with European thermal software, all coil tubes are hydraulically expanded into aluminum fins with variable spacing for fast heat transfer and longer runs between defrosts.
Air Defrost System (ADF)
Pulsed air jets blow frost crystals off the coil fins while freezing continues, extending production runs by 150% to 200%.
Multiple Automatic Cleaning Systems
Choose from three automatic wash modes to fit your shift schedule: Product Zone Cleaning (PZC) for the belt stack, Product Zone plus Evaporator (PZE), or full CIP cleaning for the belt, coils, and enclosure.
Insulated Enclosure
In our own factory Hennecke continuous PIR panels (50 to 250 mm thick) with cam lock thermal breaks and an optional fully welded stainless steel interior liner.
Fully Welded Floor
Modular, fully welded stainless steel floor pan sloped toward four corner drains for rapid washdown drainage.
Intelligent Control System
PLC touchscreen HMI displaying live zone temperatures, belt speed, fan status, and alarm logs, with preset freezing recipes for rapid product changeover.
Technical Specifications
Parameters
Standard specifications for Square S4, S6, S7, S9, and S10 self-stacking spiral freezers. We size belt width, tier count, side link height, refrigerant circuit, and CIP options for your line.
| Parameter | S4 | S6 | S7 | S9 | S10 |
|---|---|---|---|---|---|
| Tiers (Layers) | 18 to 32 | 18 to 42 | 18 to 50 | 18 to 50 | 18 to 50 |
| Belt Width (mm) | 420 | 660 | 760 | 930 | 1,060 (up to 1,372) |
| Belt Type | TitanStack® self-stacking stainless steel belt with corrugated interlocking side links | ||||
| Drive System | No-tension base chain drive on rolling ball bearings (drumless design) | ||||
| Airflow & Fans | Controlled vertical airflow with high velocity centrifugal fans | ||||
| Control Panel | Siemens PLC, color HMI touchscreen, SUS304 stainless steel cabinet | ||||
| Refrigerants | Ammonia (NH3, R717), CO2 (R744), or Freon (HFC) | ||||
| Evaporator | Aluminum or stainless steel tubes, aluminum fins, variable fin pitch | ||||
| Defrost | Water defrost / Hot gas defrost / Optional Air Defrost System (ADF) | ||||
| Freezing / Cooling Time | Adjustable with VDF | ||||
| Cleaning | Automated CIP (Clean in Place) with PZC, PZE, and full enclosure wash modes | ||||
| Safety Devices | Belt flip detector, internal emergency cable pull switch, multi-zone temperature monitor | ||||
Design Details
How Each Subsystem Is Engineered
Open each section below to see how key parts of the freezer work.
Drumless Technology Advantage
The defining feature of the self-stacking spiral is the elimination of the central drum. In a conventional spiral, the belt wraps around a rotating drum that occupies approximately 30% of the enclosure interior volume. By removing the drum and letting the belt stack on itself via side links:
- 20 to 30% more belt surface area per m² of factory floor space
- Unobstructed vertical airflow across the entire belt stack
- Full interior access for cleaning and maintenance
- Fewer structural support surfaces where product debris can accumulate
IQF Optimized Airflow
The self-stacking design is inherently IQF friendly. Without a drum blocking the center of the enclosure, cold air can be directed across the full belt width from both sides:
- Dual direction airflow ensures every piece on the belt receives uniform cold air
- CFD optimized baffle design minimizes air velocity variance
- Adjustable dampers compensate for product loading density
- Product dehydration kept ≤ 0.5% for IQF applications
Belt Technology & Self-Stacking Mechanism
The TitanStack® belt features corrugated interlocking side links on both edges. As each tier rises, the upper side links lock directly onto the tier below without a central drum or support rails:
- Corrugated interlocking links increase contact area and prevent belt collapse
- Available in 5 standard series: S4 (420 mm), S6 (660 mm), S7 (760 mm), S9 (930 mm), and S10 (1,060 to 1,372 mm)
- Tension-free base chain drive eliminates belt stretch and edge friction
Defrost Strategy
Three defrost methods are available, selected per your production schedule and refrigerant:
- Air Defrost System (ADF): Pressurized air pulses clear evaporator frost while production continues
- Hot Gas Defrost: Reverses refrigerant flow for rapid defrosting (8 to 12 min)
- Water Defrost: Warm water spray for simple, reliable frost removal
Automation & Control
A Siemens PLC and color touchscreen in a stainless steel cabinet log zone temperatures, belt speed, and fan status across 50+ product recipes. Standard safety hardware includes a belt flip detector, internal emergency cable pull switch, and multi-zone temperature monitor.
Proven in These Food Applications
Ready Meals
Freezes portioned entrees, patties, and trayed ready meals across high capacity self-stacking tiers.
Poultry Products (Raw)
Freezes raw and value added poultry cuts (breasts, wings, tenders, and nuggets) with high belt area utilization.
Poultry Products (Cooked)
Processes cooked chicken and formed poultry products with stable airflow and consistent freezing results.
Case Studies
Self-Stacking Spiral Freezer in Operation Worldwide
Proven installations running in food plants around the world.
Self-Stacking Spiral Freezer for High Volume Pancake Line
A hygienic drumless self-stacking spiral freezer with automated CIP sanitation delivered to a major pancake
Self-Stacking Spiral Freezer for Fried Chicken Nuggets: Middle East
A self-stacking spiral freezer engineered for 1,000 to 1,300 kg/h of fried chicken nuggets, commissioned
Frequently Asked Questions
Yes. The Air Defrost System (ADF) blows frost off the coil fins during production, extending run time by 150% to 200% compared to standard coils.
The freezer works with pumped ammonia (NH3), CO2, NH3 and CO2 cascade, or HFC cooling systems based on your plant size and local safety rules.
Square holds ISO 9001, ISO 45001, CE, PED, ASME (U and U2 stamps), EAC, CSA, CRN, and CNAS laboratory accreditation, supported by 300+ patents, 300+ R&D engineers, and 300+ installation and service engineers.
We build custom self-stacking spiral freezers across the S4, S6, S7, S9, and S10 series (420 to 1,372 mm belt widths, 18 to 50 tiers), matching side link height, I, L, or U infeed and outfeed layout, and CIP cleaning to your plant.
Removing the central drum and support rails delivers up to 50% more freezing output in the same floor space. The TitanStack® interlocking belt and open vertical airflow path also make cleaning faster and nearly 100% accessible.
Engineering Inquiry
Discuss Your Self-Stacking Spiral Freezer Project
Share your product and line capacity for a self-stacking spiral freezer quote.
Our engineers reply within 24 hours. All project details are kept confidential.
