Polyester Fabric Spiral Belt for Sludge Thickening

Category: Spiral Filter Fabric
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Product Manual:Polyester Fabric Spiral Belt for Thickening of Sludge in Gravity Thickeners


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Polyester Fabric Spiral Belts for Thickening of Sludge in Gravity Thickener,  Filter Belt for Sludge Dewatering, Monofilament Filter Fabric, Monofilament Filter Belt, Polyester Filter Fabrics

Made by World-Class Heatsetting Tables and ISO 9001 Quality Assurance System

Spiral filter fabrics are made of abrasion resistant PET. They contain a strong spiral seam, which has the same tensile strength as the fabric. In comparison with the clipper seam on woven fabrics, the seam on spiral fabrics has a longer service life and does not fail prematurely. It is no longer the weak point of the belt.

Dewatering properties of the fabric are given by its air permeability, which can be adjusted by inserting a suitable type of filler yarns inside the spirals. We offer spiral fabrics in the range of air permeability form 250 to 900 CFM.

Spiral fabrics are especially suitable for dewatering of fibrous material (paper sludge, pulp) and sludges with a high content of inorganic particles (e.g. mining sludges), but they can also be used for dewatering of treated municipal sludge. If the sludge has a high content of organic particles or if it is sticky and muddy, there is a risk of spiral fabric blinding.


Long service life

Suitable especially for machines where belt deformation often occurs

Abrasion resistant design

No problems with the seam

Smooth adhesive treated belt edges

Suitable for fibrous sludges

Examples of Application:

Dewatering of pulp and paper sludge

Dewatering of industrial and municipal sludge in belt filter presses

Dewatering of mining and abrasive sludge

Thickening of sludge in gravity thickeners

Forming belt for production of MDF boards

Conveyor belts

Fabric Designs


Air permeability range: 250–900 CFM
Spiral yarn diameter: 0.6mm

Spiral fabric with fine spirals and a high density of spiral yarns

Spiral FLEX

Air permeability range: 250–900 CFM
Spiral yarn diameter: 0.7mm

Spiral FLEX is a widely used spiral filter fabric with flat filler wires. It is used in a wide range of industrial applications, including the dewatering of sludge in waste water treatment plants.


Air permeability range: 550–900 CFM
Spiral yarn diameter: 0.9mm

Heavy-duty spiral fabric with long service life for very abrasive sludge, used for dewatering of pulp and mining sludge.

KEYLIFE is a professional manufacturer of industrial fabrics in China. The plant ranks one of top 5 in the industry in the country, with a registered capital of USD 19 Million and an annual sale over USD 10 Million.

Main products are paper machine clothing and belts, including forming fabrics, woven dryer fabrics,spiral fabrics and filtration belts. All these products are strongly supported by the leading technologies which keep pace with the world.
The company has the latest world-class equipments in its 32000sqm plant, including high speed weaving looms from Germany and UK, leading hot airbox table and hot oil table, and automatic seaming machines from Austria. Maximum fabric size can be 100m long and 12m wide.
The plant is ISO 9001 certified and is the supplier of many big paper mills and famous filtration companies in the world.



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