Product Series
RF-SB Series — Spiral Link Belts
Spiral link drainage belts for belt press dewatering and gravity tables. Engineered for high drainage capacity, long service life, and consistent sludge cake quality — from municipal wastewater to industrial effluent.
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Series Overview
The RF-SB Series comprises spiral link belts constructed from interlocking helical coils joined by filler wires (cross-rods). This open-mesh architecture provides exceptional drainage capacity combined with high mechanical strength — making spiral belts the preferred choice for belt press dewatering of municipal and industrial sludge.
Unlike woven filter belts, spiral belts are virtually clog-free thanks to their three-dimensional open structure. They are easy to clean under high-pressure spray bars and maintain stable permeability over thousands of operating hours.
Clog-Free Design
3D open-mesh structure
High Drainage
15–45 % open area
Custom Dimensions
Up to 4,000 mm width
Filler Options
Round & flat cross-rods
Material Options
Spiral coils and filler wires are available in polyester and polyamide — each offering distinct advantages depending on the chemical environment and operating temperature.
PET (Polyester)
The standard choice for most belt press applications. Excellent hydrolysis resistance in acidic environments, high tensile strength, good dimensional stability. Temperature resistant up to 150 °C.
PA (Polyamide / Nylon)
Superior abrasion resistance for mineral slurries and heavy-duty dewatering. Excellent resistance to alkaline environments with good flexibility and fatigue resistance.
Belt Configurations
Standard Spiral Belt
Interlocking spiral coils connected by cross-rods (filler wires). The classic open-mesh belt for gravity and low-pressure dewatering zones.
Spiral Belt with Round Fillers
Round cross-section filler wires create a smooth surface for even sludge support and clean cake discharge.
Spiral Belt with Flat Fillers
Flat filler wires reduce open area for finer retention while maintaining high drainage capacity — ideal for biological sludge.
Key Design Parameters
Spiral Pitch & Open Area
Distance between adjacent spiral coils determines open area and retention. Fine pitch for biological sludge, wide pitch for high-volume drainage.
Wire Diameter & Strength
Spiral coil and filler wire gauge affect strength, flexibility, and belt weight. Heavier gauge for high-tension presses.
Edge Treatment & Seaming
Welded edges, reinforced selvedge, and guide strips ensure belt tracking. Clipper seam or endless construction available.
Technical Specifications
Approximate values. Actual specifications depend on belt configuration and application requirements.
| Material | Max. Temp. | pH Range | Open Area | Weight | Max. Width |
|---|---|---|---|---|---|
| PET (Polyester) | 150 °C | 2–10 | 15–45 % | 2.5–6.0 kg/m² | 4,000 mm |
| PA (Polyamide) | 120 °C | 3–11 | 15–45 % | 2.5–5.5 kg/m² | 3,500 mm |
Applications
Spiral link belts are the standard in sludge dewatering across a wide range of industries.
Related Machines
Spiral link belts are used in these machine types.
Belt Press
The primary machine for spiral belt dewatering — gravity zone, wedge zone and high-pressure zone.
Learn MoreBelt Filter
Horizontal vacuum belt filters using spiral belts for gravity drainage applications.
Learn MoreDrum Filter (RVD)
Rotary vacuum drum filters with spiral link media for continuous slurry dewatering.
Learn MoreIndustries
Spiral belts are essential dewatering components in these sectors.
Wastewater Treatment
Municipal and industrial sludge dewatering — the largest application for spiral belts.
ExploreMining & Mineral Processing
Tailings dewatering and mineral concentrate filtration with abrasion-resistant spiral belts.
ExploreChemical Industry
Chemical effluent treatment and process sludge dewatering.
ExploreCommon Challenges
These filtration problems are especially relevant for spiral belt applications.
Filter Cloth Clogging
Sludge residue progressively blinds the belt, reducing drainage capacity.
SolutionsShort Filter Lifespan
Abrasion and chemical attack shorten belt service life in demanding applications.
SolutionsCake Release
Poor sludge cake discharge increases downtime and reduces dewatering efficiency.
SolutionsNeed spiral belts for your press?
Share your press model, sludge type and belt dimensions — we will recommend the optimal spiral belt configuration.
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