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Process Filtration
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Filtration processes cover a wide range of applications from, for example, pigments, colors, polymers, starch, fine chemicals, environment-related and mining industries. The enormous diversity of the products to be hand-led demands a correspondingly diverse range of equipment using a wide variety of filter fabrics and fabricated filters.
We offer
Sefar provides standardized filter solutions for the main types of equipment used in the process industries, based on fabrics that have been developed by Sefar to meet the needs of the customers. It has always been the aim of Sefar to minimize our customers’ overall process costs by reducing waste and energy requirements by maximizing the service life of our filter products.
Customized solutions that meet the industry’s most stringent require-ments (e.g. high temperatures, chemical resistance and long life-time)
Integrated production: all crucial steps from yarn production and wea-ving to fabrication of ready-to-use filters
High quality standard and product traceability Complete fabric range for all filtration tasks More than 50 years experience in the process industry
Your benefits
State-of-the-art fabricated filters Reduced production costs (e.g. higher yield, reduced machine down-time) Improved process safety and reliability Improved end-product quality Sefar offers world-wide local fabrications and services
Introduction 2
Fabrics Fabrication 3
Vacuum Belt Filter 4
Rotary Drum Filter 5
Rotary Disc Filter 6
Belt Press Filter 7
Filter Press 8
Horizontal Disc Filter 9
Leaf Filter 10
Tube Press and Multi Element
Candle Filter 11
Bag Filter 12
Cyclone Screening 13
Centrifuge 14
Fluid Bed Dryers 15
IntroductionContents
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Fabrics
Sefar offers a unique selection of high quality filter fabrics:
SEFAR TETEX® MONO - easy cleaning - resistance to clogging
SEFAR TETEX® DLW - improved stability and performances on vacuum belt filters
SEFAR TETEX® DRY - designed for dry food applications
SEFAR TETEX® MULTI and SEFAR TETEX® MC - fine filtration - special applications
SEFAR PETEX®, SEFAR NITEX®, SEFAR® PROPYLTEX, SEFAR® FLUORTEX and SEFAR CARBOTEX®
- screening - sifting operations
FDA or EU conformity is available on request. Contact your Sefar representative for more informations.
Fabrication
Sefar has established special state-of-the-art fabrication techniques in order to meet the most stringent quality expectations and performances as well as continuous process and product improvement.
The following specialized processes illustrate our constant effort to meet these requirements: Various types of continuous edge coatings and closures for belts Special coating for filter press cloth High frequency, ultrasonic and hot-wedge welding of fabrics
Fabrics / Fabrication
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Vacuum Belt Filter
Vacuum belt filter in the chemical industry
Belt closureMetal clipper closure with overlap
Cross-section of a double-layer weave (SEFAR TETEX® DLW)
With the introduction of double-layer weave (DLW) technology for vacuum belt filters Sefar has established and set the standard for this type of equipment. A broad range of double-layer weaves is based on the concept of a fine filter fabric combined with an integrated robust support and drainage fabric.
Main features Available in PP, PET and PEEK Choice of pore sizes from 7 to 160 µm Edge coating Closures in stainless steel or Hasteloy
Your benefits Optimal chemical and thermal resistance
High filtration efficiency No particle loss Reinforced and sealed edges for trouble-free operation
Long service life and low operating costs for all types of direct drive and rubber belt filters
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Vacuum drum filter for Kaolin dewatering
Rotary drum filters are often the work-horse of filtration in the process in-dustry. The design of the different types of drum filters reflects the enor-mous variety of jobs for this filter type and the industry. Sefar offers an unique range of mono- and multifilament belts.
Calendered fabrics (Perfect cake release) Belt closure with special rubber profileSEFAR TETEX® MONO with fine pores
Rotary Drum Filter
Main features Available in PP, PET, PA, PEEK, PVDF and E-CTFE
Pore size from 2 to 160 µm Choice of edge treatment and edge profiles as required by the equipment
Closure as required for the type of rotary drum
Your benefits Optimal chemical and thermal resistance
No particle loss Good filter performance Easy installation Low maintenance costs
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Rotary Disc Filter
Rotary disc filter for ore dewatering
SEFAR TETEX® MULTI Filter segments ready for installation
Rotary disc filters have a high filtration surface to foot-print ratio. However, today’s high-performance rotary disc filters or hyperbaric rotary disc filters are heavily dependent on appropri-ate filter fabrics. In close cooperation with leading machine producers Sefar has developed a range of mono- and multifilament fabrics especially adapted to the needs of this filter type.
We offer Elastic multifilament fabrics Monofilament fabrics Double-layer weave fabrics for hyperbaric filters
Main features Available in PA, PP and PET Wide choice of pore sizes Perfect fit and snap-back properties High abrasion resistance
Your benefits Material easily adjustable to meet individual needs
Good cake release Low maintenance costs
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Belt press filter belts for organic sludges, inorganic sludges, dewatering and deli-quoring (e.g. fruit pressing) are available as standard products.
Sefar has years of experience and has pioneered belt press applications in various fields.
Belt Press Filter
We offer Woven fabrics Spiralled fabrics
Main features Available in PET (Other materials can be used on request)
Wide range of pore sizes and permeability
Coated edges Stainless steel closures or non- marking closures
FDA-conform materials available
Your benefits Optimal selection of strengths, permeability and cake release
Belts adjusted to the different belt press constructions
Coated edges for a long and trouble-free service life
Easy installation
Belt press for sludge dewatering
Satin weave Coated edge for maximum mechanical resistance
Heavy-duty metal clipper closure
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Filter Press
Filter press with automatic cake release
Overhang cloth for easy installationFilter press clothsFilter press cloths fabrication
Sefar filter fabrics have been designed to cope with the specific conditions in the filter press. The fabrication tech-niques and choice of fabrics are tuned to the requirements of different slud-ges, products and industries. Cake release, ease-of-cleaning, life-time, particle retention and service costs are just a few requirements to be taken into account.
Sefar has extensive experience in virtually every filter press application.
We offer Overhang cloth Barrel neck cloth Special press cloth Plate and frame press cloth
Main features Available in PP, PA, PET, PVDF and E-CTFE
Choice of pore size from 2 to 160 µm FDA-conform materials available Welded plastic eyelets Double fabric having rubber barrel neck
Your benefits Optimal chemical and thermal resistance
Low moisture content due to fine-tuned fabric choice
Edge coating avoids drippage Easy installation (Velcro fastener, Filmatic, ...)
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Filtration of fine particles, pigments or recovering of precious catalysts are a few of the various applications for horizontal disc filters. The wide range of Sefar materials offers a unique opportunity to match exactly individual customer requirements. Particle reten-tion, cake release, cleaning properties and life-time are key issues for the selection of filter materials.
Horizontal Disc Filter
Horizontal disc filter for pigment production
We offer Laser cut discs Seamed discs Mono- and multifilament fabrics
Main features Available in PP, PA, PET, PEEK, PVDF, E-CTFE and PTFE
Choice of pore sizes from 2 to 160 µm Customized edge design FDA-conform materials available
Your benefits Optimal chemical and thermal resistance
Increased filter performance Easy installation Low maintenance costs
SEFAR TETEX® MULTI for maximum particle retention and good mechanical resistance
Special designed edgesSEFAR TETEX® MONO for high permeability and easy cleaning
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Leaf Filter
Leaf filters in a chemical plant
Leaf filter ready for inspection and cleaning Leaf filter bags ready for installation
Sefar produces many cover types in-cluding mono-, multifilament and spe-cial sintered material bags which are well-known for their unique cleaning and particle retention properties. Leaf filter pockets are manufactured in close cooperation with leading filter manu-facturers in order to ensure the best possible performance.
Special attention has been paid to: Particle retention Cleaning performance Life-time Installation
We offer Filter bags Covers
Main features Available in PP, PA, PET, E-CTFE, PTFE or as required
Pore sizes from 2 to 150 µm and air permeability down to 4 l/m2/s
Smooth, calendered surface Welded and laser cut bags having minimal tolerances
Your benefits Chemical and thermal resistance to your individual needs
High filtration efficiency No particle loss Good cake release Easy installation
SEFAR TETEX® MONO for maximal particle retention, good strength and flexibility
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Tube press and multi-element candle filters are popular in many industry segments due to their fully automat-ed and smooth operation. Sefar has a range of materials and processes adapted to this type of equipment.
We are able to provide a wide range of materials and diameters for tube and candle filters.
Tube Press and Multi-Element Candle Filter
Candle filter for the recovering of catalysts
We offer Woven tubes Welded tubes Stitched tubes
Main features Available in PP, PA, PET, PEEK and E-CTFE or as required
Pore sizes from 2 to 150 µm and air permeability down to 4 l/m2/s
Tubes having smooth (Calendered) surface
Your benefits Optimized solutions according to your requirements
Improved particle retention, cake release and cleaning properties
SEFAR TETEX® welded tubeSEFAR TETEX® MONO fabric for candle filters
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Bag Filter
Bag filter for the filtration of lacquers
Bag filter with a plastic ring Bag filter with steel ring
Strainer bags are available in a huge variety of designs (Drawstrings, wire ring, flanged and special designs) and materials (Micron-rated, high-efficiency meshes and felts). We show here just a few examples.
We offer Bags with drawstrings Wire rings Plastic rings Special designs
Availability and design of these products depend on the geographical area.
Main features Available in PA, PET, PP, PVDF or as required
Sealant steel or plastic ring, adjusted to various types of equipment
Customized designs, shapes and materials possible
Your benefits Standard products available for most filter types
Customer-specific filters to meet special requirements possible
Bag filter with lifting strips
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Cyclone screening equipment are mainly used for food, pharmaceutical, chemical, polymer and pigment appli-cations.
Sefar offers rotary screens made of different polymers such as PET, PA and conductive PA.
Cyclone Screening
Rotary screening machine
Main features Wide choice of materials available Broad range of high-quality meshes Screens and rotary screens made according to individual needs
FDA-conform materials available Consistent tension across the screen
Your benefits Optimized performance for various screening applications
Suitable for food applications Long life-time Abrasion resistance (Heavy-duty products)
Turbo-sifter coversSEFAR NITEX®, SEFAR PETEX®, SEFAR NYTAL®, SEFAR CARBOTEX®
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Inverting centrifuge
Centrifuge bag Centrifuge liner
Sefar offers innovative solutions for any type of centrifuge equipment such as liners, centrifuge bags and invert-ing centrifuges. Fabrication techniques and fabrics are chosen to optimize the overall productivity of the centrifuge and special attention is given to the most demanding requirements.
Our precision woven fabrics are de-signed in a wide variety of weave styles using the advantages of mono- and/or multifilament fibers. Sefar’s centrifuge excel when processing pharmaceuticals or chemicals having particle sizes.
We offer Centrifuge bags Liners for peeler centrifuges such as endless liners
Bags for inverting filter centrifuges
Main features Fixation adapted to your filter machine
Connections welded Filters with integrated backing cloth Wide range of pore sizes and material
Pharma labelling possible SEFAR® PHARMA-Grade fabrics and fabrication
Your benefits Minimized product loss and high yield
Low machine downtime and easy installation
Superior cake release (No clogging) Documentation and traceability
Centrifuges
Filter zoneDrainage with DLW (Integrated backing cloth)
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Fluid bed dryer
Sefar is one of the world’s leading producers of fabrics and finished bags for fluid bed dryers. Whether you are drying, agglomerating or spray coating, Sefar has the right material for your demanding application.
Our SEFAR® PHARMA-Grade line
complies with leading pharmaceutical companies requirements (Production according GMP regulations and docu-mentation according FDA regulations).
Flat cap Conductive ribbon to ensure full conductivity Stable sandwich construction
(Fabric-felt-fabric) to avoid dead spaces
Cone cap Stable sandwich construction
(Fabric-felt-fabric) to avoid dead spaces
We offer Fluid bed dryer bags Connector sleeves Bowl screens
Availability and design of these products depend on the geographical area.
Main features Welded, particle thight tubes Unique certification of the electrical resistance
Excellent resistance to wear and abrasion
Complete range of Pharma Grade fabrics and fabrication
Your benefits Higher yield (Reduced product loss) Increased safety (Proven conductivity of assembled bag)
Optimal service life Low machine downtime
Fluid Bed Dryers
Tube Welded tubes (Without stitching holes) to
minimize product loss Conductive fabrics
Sefar worldwideSefar is the leading manufacturer of precision fabrics from monofilaments for the screen printing and filtration market. Sefar products are used in a wide variety of industries, reaching from electronics, graphics, medical, automotive, food and pharmaceutical applications to aerospace, mining & refining and architecture. With its profound understanding of the applications Sefar helps its customers to achieve optimum results in their industrial processes. Subsidiaries and fabrications centers in 25 countries on 5 continents provide local technical service for the broad range of solutions offered by Sefar.
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Subsidiaries Asia
China – SuzhouPhone +86 512 6283 [email protected]
India – District ThanePhone +91 2522 2940-34 /35 /[email protected]
Indonesia – Jakarta BaratPhone +62 21 5890 2065 /66 /[email protected]
Japan – OsakaPhone +81 64 709 [email protected]
Korea – SeoulPhone +82 2 713 [email protected]
Malaysia – JohorPhone +60 786 771 [email protected]
SingaporePhone +65 6299 [email protected]
Thailand – BangkokPhone +66 261 887 [email protected]
Vietnam – Ho Chi Minh CityPhone +84 862 925 562/[email protected]
Subsidiaries Europe
England – BuryPhone +44 161 765 [email protected]
France – LyonPhone +33 472 13 14 [email protected]
Germany – EdlingPhone +49 8071 90400 [email protected]
Italy – CollegnoPhone +39 011 42 [email protected]
Netherlands – LochemPhone +31 573 25 82 [email protected]
Poland – PoznanPhone +48 511 467 [email protected]
Spain – CardedeuPhone +34 93 844 47 [email protected]
Turkey – AnkaraPhone +90 312 287 34 [email protected]
Headquarters
Sefar AGHinterbissaustrasse 129410 Heiden – SwitzerlandPhone +41 71 898 57 00Fax +41 71 898 57 [email protected]
Our most current general sales conditions shall apply.Please consult the most current local product data sheet prior to any use.
Subsidiaries Americas
USA – BuffaloPhone +1 800 995 [email protected]
Canada – SaguenayPhone +1 418 690 [email protected]
Brazil – São Bernardo do CampoPhone +55 11 4390 [email protected]
Mexico – Cuautitlan IzcalliPhone +52 55 2291 [email protected]
Subsidiaries Australia & New Zealand
Australia – HuntingwoodPhone +61 2 8822 [email protected]
New Zealand – AucklandPhone +64 9 622 [email protected]
