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Sefar Filtration Products Page |
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Filtration
Products |
Sefar has
local fabrication units for the process industry in all major
sales areas. Sefar can thus adapt efficiently to local needs
and also call on the pool of know-how and experience shared
by the different international Sefar companies to ensure that
every process customer gets the optimal filter solution. |
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Belt Filter
Filter belts are rectangular or square
parts with a closure pressed in or sewn to form an endless belt.
For a trouble-free and efficient service life a straight run
and good tracking behaviour are most important.
Sefar offers various fabrication solutions of which the most
important are listed below.
Multiple reinforced edge solutions for better tracking behavior
and edge protection are available with PU-coatings
Highly sophisticated closures for an easy installation
Over- and under-lappings for closures to diminish product loss
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Centrifuge Bag
Fabrication designs for centrifuge filter
bags are available for all makes and models.
Our high-quality manufacturing guarantees easy installation
and a perfect fit.
Specially adapted strong seam solutions avoiding product loss
through stitching holes and avoid product contamination from
loose fibers
Our filter bags are customized to your specific needs. We offer
designs for middle cones, flanging, lifting or unloading devices
State-of-the-art cutting technology achieves precise and constant
dimensions |
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Centrifuge Liner
Fabrication designs for centrifuge filter
bags are available for all makes and models. The specific seal
designs are adapted to your filter centrifuge machine.
Drop-in-ready liners (cylinders) are available on request. Our
high-quality manufacturing guarantees easy installation and
a perfect fit.
Our filter bags are customized to your specific needs. We offer
designs for flanging, lifting or unloading devices
State-of-the-art cutting technology achieves precise and constant
dimensions
Specially adapted strong seam solutions avoiding product loss
through stitching holes and avoid product contamination from
loose fibers
Depending on the type of model, fabric and use, the centrifuge
bags are ultrasonically welded
Advantage: no leakage due to absence of stitching holes.
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Rotary Drum Filter
Sefar manufactures drum filter belts
for all types of machines. To ensure a trouble-free belt tracking
behavior from designs to fabrication only state-of-the-art technology
is used.
Sefar offers various fabrication solutions of which the most
important are listed below.
Highly sophisticated cutting technology to achieve precise dimensions
Special edge solution (rubber guiding profile) to significantly
improve belt tracking behavior
Various stitching and welding solutions for the longitudinal
seam to provide an optimal fabric joint |
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Filter Press
Sefar filter press cloths are well
suited for virtually all press types and applications. We offer
various designs and product types, which are all trimmed to
give a perfect fit and easy installation.
Sefar offers various fabrication solutions of which the most
important are listed below.
Designs with special neck and sealing solutions for an optimal
fit
Special edge reinforcement to achieve an even longer service
life
Special eyelets for an optimal fit to the machine |
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Rotary Disc Filter
Sefar manufactures segments for rotary
disc filters, which can be equipped with a closure for an easy
installation. Our high fabrication quality and the precise control
of the dimensions of the finished segment ensure an exact fit.
Sefar offers various fabrication solutions of which the most
important are listed below.
State-of-the-art cutting technology to achieve precise dimensions
Special edge reinforcement to achieve an even longer service
life
Zip-on or hook and loop closure for an easy installation
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Leaf Filter
Sefar supplies ready-to-use leaf filter
bags, which are designed for an easy installation to reduce
your downtime. We offer various designs and product types, which
are all trimmed to give a perfect fit and easy installation.
Sefar offers various fabrication solutions of which the most
important are listed below.
Precise dimensions are ensured by our highly sophisticated cutting
technology
Various joint technologies to prevent particle leakage through
the seam
Reliable sealing devices and reinforcements for constant results
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Nutsche Filter
Our fabricated solutions for nutsche
filters include bags, discs or element covers.
For this application roll-goods are often cut to size by the
end-user.
Specially adapted strong seam solutions avoiding product and
pressure loss through stitching holes and product contamination
from loose fibers
Our filter bags are customized to your specific needs. We offer
designs for flanging, lifting or mounting devices
State-of-the-art cutting technology achieves precise and constant
dimensions |
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Horizontal Disc Filter
We produce ready-to-use discs
for the horizontal disc filters.
For this application roll-goods are often cut to size by the
end-user.
Our discs are customized to your specific needs. We offer
designs for mounting aids, sealing devices and reinforcements
State-of-the-art cutting technology to achieve precise and
constant dimensions |
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Pan Filter
Sefar
manufactures ready-to-use filter segments for immediate fitting
on the pan filter.
Our controlled fabrication process ensures the high Sefar quality
standards are met.
latest cutting technology ensures accurate dimensions
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Coolant Belt Filter
Sefar produces high-quality coolant
belts of different designs and dimensions.
Our careful fabrication ensures constant filter efficiency and
the good particle release of our belts.
Sefar offers various fabrication solutions of which the most
important are listed below.
Special edge treatments such as PU-coatings to increase reliability
Textile or polyurethane transport aids for an efficient particle
recycling
Adapted closures solutions guarantee easy installation
Top-seal closures made of polyurethane (thermo plastic polyurethane)
are a user-friendly system for belt filters.
Advantage: flexible, tight (no over- / underlap necessary)
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| Drying,
Transporting Products |
| As a specialist for screens and
belts with a high permeability for air, Sefar has broad experience
in drying and conveying all kind of products. Your local Sefar
specialist is pleased to share our experience. |
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Fabrication Belt Dryer
Specific edge solutions for different machine types
To obtain a good operation and
long lifetime in a drying process it is most important that
the belt is precisely cut, has the optimum edge solution and
also the right closure system.
According the type of the machine various edge solutions are
available:
heat-cut edge
protection ribbon sewn,
pressed or welded on
coated edge |
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The right closure for a
good beginning
There are different closure systems available. The choice depends
your own requirements and machine types. The following closure
systems are available:
metal pin seam
mono pin seam (synthetic joint)
synthetical spiral pin seam |
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Fabrication Fluid Bed Dryer
Fabrication designs for fluid bed dryer
bags are available for all makes and models. We offer standard
solutions for most existing cap and skirt designs (zipper, draw
cord, O-ring, Velcro, etc.). Our high-quality manufacturing
guarantees easy installation and a perfect fit.
Specially adapted strong seam solutions avoiding product loss
through stitching holes and product contamination from loose
fibers
Our filter bags are customized to your specific needs and dryer
equipment
State-of-the-art cutting technology achieves precise and constant
dimensions
FDA-conform sealing of the seam possible on request |
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| Screening
Equipment |
| Solid/solid separation is efficiently
carried out with screens. As a pioneer in synthetic screens,
Sefar has a wide range of specialized fabrics for different
applications. |
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Fabrication Centrifugal Sifter
The secret is in the seam
Sefar offers ready-made-up cylinder covers for centrifugal sifter
machines.The choice of the fabric and the seam are the deciding
factors in ensuring the smooth functioning of the sieve cylinder.
Sefar uses the optimal seam joining technology for each fabric.
Seam variations:
sewn
armored (AR)
high-frequency (HF)
ultrasonic (US) |
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Fabrication Purifier
Sefar supplies ready-to-use covers
that are designed for an easy installation.
Flexible inlet and outlet sleeves made of polyester or polyamide
multifilament fabric ensure a dust-free and regular product
flow on plansifters and purifiers. Sefar manufactures inlet
and outlet sleeves having excellent hygienic properties.
Different machines – different edges
Sefar offers ready-made covers for all types of purifiers. According
to machine type, various edges are available:
heat cut
sewn
sewn-in PVC-rod |
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Fabrication Sifter / Plansifter
Easy reframing by Sefar
Sefar offers roll goods as well as cut-to-size covers and ready-made
sifter covers with ribbon/webbings for the reframing process.
Our standard solutions are fabricated according to your specifications,
including special characteristics such as taped edges.
All designs and measurements can be customized to your individual
requirements and we can ensure the 100% reproducibility of any
article. To guarantee the high quality of our products only
state-of-the-art technology is applied in production and our
product engineers are continuously working on product improvements. |
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Fabrication Vibro Tumble Screener
Easy reframing by Sefar
As well as roll goods, Sefar offers cut-to-size covers and ready-made
sifter covers with ribbon/webbings for the reframing process.
Our standard solutions can be produced exactly to specifications
as supplied in your drawings and upgraded with our adapted features,
such as special seam solutions, stripes or edge coatings.
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| Fabricated
Products |
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| Sefar has state-of-the-art manufacturing
facilities for producing components to fulfill the most demanding
requirements. Customers can profit from our manufacturing experience
and capabilities by letting Sefar fabricate their filter element
products. Products that require strict cleanliness control can
be fabricated in our Class 10,000 cleanrooms. |
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Tubes, Cut to Length
Product
form
Tubes, cut to length, are segments cut of from woven, ultrasonically
welded or heat-slit tubes. Laser cutting provides heat-sealed,
non-fraying edges. Diameters range from 2 to 80 mm, lengths
range from 10 to 500 mm.
Cold cutting provides non-sealed edges that may fray. Diameters
range from 80 mm to
125 mm, lengths range from 10 to 1000 mm.
Make-up
Tube segments can be made either by cold or laser cut. The choice
is determined by the required edge quality. |
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Tubes, Heat-Slit
Product form
Fabrics, single and multilayer,
can be heat-slit into tube configurations. Tubes are made by
slitting two layers of fabric together with a heated knife,
creating two flat seams at either side of the tube. Heat-slit
fabric edges are melted or fused together to increase durability
and decrease fraying. The heat-slit seam has a limited strength
and should be used as a transport seam only, e.g. for injection
molding.
All fabrics with thread diameters < 250 µm and mesh
openings < 500 µm can be heat slit . Heat-slit tubes
are defined by the inner diameter which is tested with a mandrel:
tube diameters range from 8 - 320 mm . |
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The inner diameter of the heat-slit
tube does not equal the flat width of the the tube itself. The
effect of welded "wings" on either side has to be
taken into consideration; the width depends on the mesh type.
Make-up
Tubes are wound onto standard cores:
polyester discs have an inner square hole
30 x 30 mm and an outer diameter of 61 mm. Upon request tubes
can also be rolled onto special cores: An ABS ring having an
inner diameter of 76 mm (3"). Depending on fabric type
and tube dimensions, roll length of up to 500 m are possible. |
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Tubes, Us-Welded
Product form
Fabrics, single and multilayer,
can be ultrasonically welded into tube configurations. Tubes
are made with one overlapping ultrasonic weld. Welds are accurate,
clean and are made without the introduction of secondary material
to the weld.
All fabrics with thread diameters < 250 µm and mesh
openings < 500 µm can be ultrasonically welded, tube
diameters range from 2 - 250 mm.
Make-up
Tubes are wound onto standard cores:
Polyester discs have an inner square hole
30 x 30 mm and an outer diameter of 61 mm.
Depending on fabric type and tube dimensions, roll length of
up to 700 m are possible. |
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Tubes, Bags
Product form
Flat bags can be made of one
or several fabric layers, for example to achieve a combination
of filter and support layer.
Bags are determined by flat width or diameter and height in
mm. Max. diameter is 160 mm, max. flat width is 250 mm, max.
height is
420 mm.
Make-up
Bags are made from ultrasonically welded tubes. The
bottom seam of the bag is produced after tubing by ultrasonic
welding. The flat bag is then cut into length by either cold-
or laser-cut to length. |
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Ribbons
Product form
Fabrics, single or multilayer,
can be heat- or ultrasonically-slit into ribbon form.
Heat-slitting produces a melted, closed edge and is possible
for all fabrics with the exception of PTFE fabrics. Ribbon width
ranges from
7 mm to 2400 mm.
Ultrasonic-slitting produces a closed edge with very little
material build-up at the edge.
Ribbon widths ranges from 4 mm to 700 mm. |
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Make-up
For widths up to 300 mm, ribbons are wound onto polyester discs
with an inner square hole
30 x 30 mm and an outer diameter of 61 mm. Upon request ribbons
can also be rolled onto ABS rings with an inner diameter of
76 mm (3"). Ribbons which are wider than 300 mm are wound
onto polystyrene tubes with an inner diameter of 76 mm (3").
Depending on fabric type and tube dimensions, roll lengths of
up to 700 m are possible. |
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Shapes, Stamped Pieces
Product form
Stamped pieces are conveniant
for insert molding and are made from Sefar fabrics by a cold,
laser or ultrasonic stamping process.
Cold stamping is the most economical process and provides standard-tolerance
pieces with edges that are not sealed and therefore might fray.
Cold stamping is possible for all fabrics. Piece dimensions
range up to 1000 x 1000 mm.
Laser stamping provides a heat-sealed edge. Maximum dimensions
are 480 x 480 mm.
Ultrasonic stamping ensures tight tolerances, for fabrics with
mesh openings < 400 microns. Ultrasonic-stamping provides
high-quality sealed edges which do not fray. Stamped discs with
a diameter range of 6 to 95 mm are possible. Multilayer pieces
are possible. |
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Pleated Elements
Product form
Pleated elements are ribbons
which have been pleated together, and then cut to a defined
number of pleats. The individual fabric layers are simultaneously
cut and welded together on their longitudinal side during the
ultrasonic slitting. The cutting to a defined number of pleats
is done by ultrasonic slitting.
Depending on the selected fabrics, up to
5 layers can be pleated together. Pleat width ranges from 25
to 1200 mm; pleat height ranges from 6mm (one layer) or 8 mm
(multilayer) to
50 mm; pleat counts are unlimited.
The position of the individual fabric layers, the specification
of the filter side and also the number of pleats are all very
important and therefore have to be defined precisely. |
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Continuous Pleated Elements
Product form
Continuous pleated elements are
ribbons which have been pleated together and then cut off after
a defined number of pleats. These pleated elements are then
ultrasonically welded together to form a cylinder. The individual
fabric layers are simultaneously cut and welded together on
their longitudinal side during the ultrasonic slitting. The
cutting to a defined number of pleats is done by ultrasonic
cutting.
Depending on the selected fabrics, up to
5 layers can be pleated together. Pleat width ranges from 25
to 380 mm; pleat height ranges from 8 to 25 mm; up to 100 pleat
counts are possible.
The position of the individual fabric layers,
the specification of the filter side and also the number of
pleats are all very important and therefore have to be defined
precisely |
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Semi-finished Components
Product form
Adhesive filter components are
made by combining fabrics with one or several adhesive layers
or alternatively with a dispenser tape.
The fabric pieces are cold- or laser-stamped into single rings,
double rings or customer-specific shapes. Laser-stamped parts
can be supplied having max. dimensions of 480 x 480 mm. Cold
stamped parts can be supplied having max. dimensions of 120
x 120 mm.
Adhesive filter components can be supplied with a one-sided
or a double-sided adhesive layer. These fabrics parts have the
advantage that they can be joined quickly and efficiently to
any housing or other component. |
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Adhesive filter components can also be supplied on a dispenser
tape without any adhesive backing. These products have the advantage
that they can be transported and handled easily in automated
assembly systems.
Make-up
Adhesive filter components, either having adhesive layers or
on a dispenser tape, are supplied on a backing tape and are
wound onto cores having a diameter of 6 inches (152.4 mm). |
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