Dyes & Pigments Filtration Solutions
Cleaner filtrate and cake that drops off, for dye, intermediate and pigment presses.
Batch After Batch,
Shade After Shade.
Dye and pigment manufacturing filters fine, high-value solids out of acidic, alkaline and salt-laden mother liquors. DFR Technical Textiles supplies filter press cloths that hold sub-micron particles, resist the full pH range, wash cleanly to low salt, and release cake without carrying colour into the next batch.
Resists Acids, Alkalis & Solvents
Retains Sub-Micron Pigment Particles
No Colour Carry-Over Between Shades
Efficient Cake Washing to Low Salt
Three Problems
We Are Asked to Fix.
Cloudy filtrate from fine particles
How our cloth helps
Tighter, heat-set weaves hold pore size steady, so sub-micron pigment and fine intermediate crystals stay in the cake and the filtrate runs clear from the first cycle.
Cake sticking to the cloth
How our cloth helps
A smooth, calendered release face lets the cake drop on opening: shorter cycles, less scraping, and less colour left behind for the next shade.
Blinding in acid or salt liquors, frequent washing
How our cloth helps
PP monofilament and multifilament constructions resist acid, alkali and salt, and shed intermediate crystals such as H-acid, vinyl sulphone and naphthols instead of trapping them, for longer runs between wash-downs.
Where DFR
Adds Value.
Our cloths work at the isolation stage, where product value, purity and yield are all decided at once.
Reaction
Diazotisation, coupling, sulphonation or condensation in the reactor.
Precipitation
Product is salted or pH-shifted out of solution as a fine slurry.
Filter Press Isolation
DFR cloths capture fine solids, hold clarity and release a clean press cake.
Cake Washing
Uniform wash flow strips residual salt and acid for a purer product.
Drying & Milling
Press cake is dried and milled to standardised powder or granules.
Three Filtration Duties
Dyestuffs
Reactive, disperse, acid, direct & vat dyes
- Clear filtrate from the first cycle
- Stable across acidic and alkaline isolations
- Clean discharge, minimal residual colour
- Faster shade changeovers
- Higher press-cake solids, lower drying load
Dye Intermediates
H-acid, gamma acid, vinyl sulphone, naphthols
- Withstands hot, strongly acidic liquors
- High product recovery from mother liquor
- Efficient washing to low sulphate and salt
- Resists blinding from fine crystalline solids
- Long service life under continuous duty
Organic Pigments
Azo, phthalocyanine & high-performance pigments
- Retains sub-micron primary particles
- Uniform cake for consistent tinting strength
- Thorough wash-out of salts and by-products
- Smooth surface for complete cake release
- Low fibre shedding into the product
Woven, Finished & Stitched In-House,
Cut to Your Plate Drawing.
PP & Polyester Filter Press Cloths
Smooth release finish; mono- or multifilament to suit dye, intermediate or pigment particle size.
Filter press clothsGasketed (CGR) Cloths
Rubber-edged for leak-free closure, so no coloured drip between plates.
Filter press clothsEffluent Cloths
For gypsum and iron-sludge presses on your ETP, matched to the same plates.
Effluent treatmentCentrifuge & Nutsche Cloths
Bags and discs for basket centrifuges and Nutsche filters on the same line.
Filtration made-upsAvailable Fabric Configurations
Polypropylene (PP)
First choice for acid and alkali resistance across the pH range
Polyester (PET)
Dimensional stability for hot isolations and long cycles
Monofilament
Non-blinding surface, easy release and fast shade change
Multifilament
Tight retention of fine and sub-micron particles
Calendered & Sealed
Smooth heat-set face, sealed edges and CGR gaskets
Why Choose DFR Filter Press Cloths
for Dyes, Intermediates & Pigments?
Full pH Range
PP and PET constructions proven in strong acid, caustic and solvent service.
Fine Particle Retention
Pore geometry held steady for clear filtrate and maximum yield.
Shade Purity
A smooth, low-retention face keeps colour out of the next batch.
Better Cake Washing
Even wash distribution for lower salt and acid in the product.
Woven & Stitched In-House
Yarn to finished cloth in one facility in Gujarat, supplying dye, intermediate and pigment plants.
Cut to Your Drawing
Recessed, membrane, plate & frame or CGR. Standard sizes from stock.
Clear filtrate.
Clean shade changes.
Send us your press make and plate size, the product and its pH, and what is going wrong with the cloth you use now. We will propose a construction for it.