The right solution for any curve
Siegling Prolink spiral belts easily handle extreme temperatures, heavy loads, moisture or tight radii.
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Siegling Prolink spiral belts
Spiral conveyors require exceptional conveyor belts. In cooling, freezing, fermenting or drying applications, our modular plastic belts are hygienic, reliable and durable solutions.
The benefits at a glance
- Customized radii: Adjustable curve geometries with collapse factors of 1.3 to 2.9 – ideal for space-saving spiral towers
- Clip-free splice: No risk from small loose parts – hygienic, safe and maintenance friendly
- Up to 57% open areas: Ideal airflow for cooling, freezing and drying processes/li>
- Robust design: Stainless steel hinge pins, outstanding lateral stiffness and durable brick-bond-type layouts
- Diverse materials: FDA, EU and MHLW compliant – also as flame-retardant variants
Planning a new project or seeking to upgrade your existing spirals? Our belting experts are happy to help.
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Spiral belts are primarily used in food processing. But other industries requiring reliable conveying in curves under challenging conditions deploy them too.
- Food processing (baked goods, meat, poultry, frozen food)
- Packaging industry
- Intralogistics and buffering sections
- Cooling and drying processes in non-food applications
Hattesen’s licorice and Prolink S18
Hattesen’s Konfektfabrik produces hand-made, vegan, allergen-free licorice with natural flavors on the Danish island of Ærø.
Hattesen chose our Prolink series 18 in spiral towers to dry the sensitive licorice squares:
🔹 Gentle conveying and a sturdy surface with 44% open area
🔹 Efficient drying – 160 m belt length on just a 7 m² surface
🔹 Easy-to-clean design – hygienic, practical to clean, no residues
🔹 Intermittent operation possible – the spiral stops every 6 hours for rotation
The results: Even drying, seamless product release and a belt that (even months later) looks as good as new.
SOON GIAP ENGINEERING WORKS’s self-stacker
Why series 9 makes a difference to your project:
🔹 It’s a flexible option on straight and curved sections
🔹 With a 57% open area, it offers superb airflow
🔹 It’s robustly designed with stainless steel pins for heavy loads
🔹 It’s reliable and a clip-free splice means smooth operation
Why pick Forbo spiral belts?
✓ Custom-fit curves for any conveyor
Sophisticated side modules mean our spiral belts adapt precisely to spirals’ inner radius – even where space is tight. Series like Prolink 9.1 enable collapse factors of 1.3 to 2.9 – for compact spiral towers and efficient usage of space.
✓ Robust, hygienic, durable
With their stainless steel pins, exceptional lateral stiffness and easy-to-clean surfaces, our belts are ideal for challenging environments. They comply with challenging international FDA, EU and MHLW Japan hygiene requirements.
✓ Broad range of types
Our portfolio of series S5, S9, S9.1, S11 and S18 offers belts that are open or closed, have a friction lining or a continuous surface. A choice of pitches (25/50 mm), open areas of up to 57%, guided variants and ball-bearing modules mean enormous flexibility for your processes.
✓ For greater tensile force and curve handling
Our combination belts marry superb tensile strength with excellent curve handling – making them ideal for challenging applications. →Find out more
An overview of all Forbo spiral belts
| Series | S5 / S5 ST | S9 | S9.1 | S11 | S18 |
| Pitch [mm] | 25 | 50 | 50 | 25 | 25.4 |
| Open [%] | 33–45 | 57 | 57 | 33–45 | 44 |
| Tensile force POM [N] | 1800/2100 | 2800 | 2800 | 2100 | 2500 |
| Tensile force PA [N] | 1440/1680 | 2241 | – | 1680 | 2040 |
| Material | POM/PP/PE/PA | POM/PP/PE/PA | POM-CR | POM/PP/PA | POM/PP/PA |
| Hinge pin | Stainless steel | Stainless steel | Stainless steel Ø6 | Plastic (PBT Ø 5 mm) | Plastic (Ø 4.2 mm) |
| minimum width [mm] | 100 / 175 (ST) | 100 | 350 | 175 | 149.4 |
| Temp. [°C] | -30 to +100 | -30 to +100 | -45 to +90 | -30 to +100 | -30 to +100 |
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Series 5 plastic modular belt – Versatile for curves and straight sections
The Prolink series 5 is the versatile plastic modular belt for curved and straight conveyors in hygiene-critical applications:
- Open area of up to 45% for excellent airflow
- Optionally with Friction Top, Nub Top pattern
- Ball-bearing modules (BT) available for special applications that require low friction coefficients
- Guided and ST variants for greater tensile loads
- Stainless steel hinge pins for smooth tracking.
to excerpt series 5
Series 9 plastic modular belt – Durable curved belts for very reliable processes
Series 9 belts stand apart for their superior tensile force in curves and inherently stable and hygienic designs. Therefore, they are ideal for demanding applications such as cooling, fermentation and freezing:
- Hard-wearing stainless steel pins affixed to side modules minimize width tolerances in fluctuating temperatures
- Very good belt guidance even with big distances between support strips
- Very strong and wearproof – no abrasion unlike steel belts
-FDA and EU compliant, flame retardant on request (UL-94, V2)
- Quick fitting, easy maintenance, long service lives
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Prolink series 9.1 – the customized spiral belt
Forbo’s series 9.1 is a very compact spiral belt for conveyors with cage drives:
- 13 variants for each belt width thanks to combinable side modules
- Smooth tracking thanks to precise radius adjustment
- Footprint up to 48% lower
- Stainless steel pins for heavy loads and easy maintenance
For more, see the flyer on Series 9.1
Series 11 curved belt – for tight radii and lightweight products
The Prolink series 11 is a lightweight plastic modular belt for very tight curve radii:
- Curve radii from 1.4 times the belt width
- Up to 45% open area for cooling and drainage
- Plastic pins to save weight
- Friction Top variants available for more grip
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Series 18 spiral belt – the robust curved belt for demanding sections
Forbo’s series 18 is a very high-performance plastic modular belt for curved and straight conveyors:
- Superior tensile force of up to 1600 N – ideal for tight radii and constant operation
- With a 44 % open area for good airflow and easy cleaning
- Wearproof PLX hinge pins mean stability even in wet applications
- Easy to fit, particularly to existing conveyors
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to the series 18 flyer
