Filter cartridges
Putsch® offers a large variety of different filter cartridges for any area of application.
As a longstanding manufacturer of filter press systems, Putsch® knows exactly which filter cloths delivers the best results. Putsch® offers the full range of filter cloths in all variants – whether for Putsch® filter presses or for third-party systems.
Putsch® has great experience and offers competent and fair advice for selecting the correct filter cloth.
Putsch® also offers filter cloths manufactured to customer drawings of the cloth or plate as well as to sample cloths supplied (used, but dry and cleaned, so the most important parameters for manufacturing can be identified).
The fabric for the filter cloths are cut to size accurately with laser technology.
Putsch® filter cloths are available in all variants: as barrel-neck cloths, overhang cloths or with sealing edge.
Barrel-neck cloths consist of two fabric layers which are connected to a sewn-on fabric neck.
For the overhang cloths, the fabric is placed over the filter plate so both sides are covered. Today, overhang cloths are usually only used as rough underlay cloths for barrel-neck cloths to serve as drainage. For modern filter plates with appropriate support for the outflow, underlay cloths have basically become superfluous.
There is a customer base, however, who still need underlay cloths, so Putsch® continues to offer these.
For special “non-drip” filter plates, filter cloths are available with a sewn-in sealing edge which fits precisely into a groove in the filter plate. The filter chamber itself has an additional sealing ring on the edge to provide sealing to the outside. This sealing ensures that no emissions occur during operation of the filter press. This allows compliance with special environmental and health and safety regulations for critical suspensions.
Polypropylene filter cloths are most commonly used for filter presses. But a large number of other materials is also available, e.g. if certain chemicals or high temperatures exclude the use of polypropylene:
– Polyamide for certain solvents and for constant temperatures between 90 °C and 110 °C.
– Polyester, e.g. for certain chemical filtrates at temperatures up to 170 °C.
It is particularly important that filter cloths have contact with the plate across the entire surface. Putsch® focuses on dimensional stability, swelling behavior and durability of the material for filter cloths, which sets the products apart from many other manufacturers. After all, filter cloths have to last for a long time under the extreme conditions in the filter press and have to survive many cleaning cycles.
If a filter cloth becomes distorted or wrinkled when it is installed again, filtration will be impaired. The filter cake cannot be drained due to the double layer created by the wrinkles and also adheres more strongly to the filter cloth in this area. In some cases, the chamber may even leak and the plates and cloths in the sealing areas may become damaged if the wrinkles are pressed into the plate under high closing pressure.
The filter action is a result of the mesh size and the type of filament. The filter cloths are woven with particular precision and evenness so the mesh has its own stability and keeps its structure even under application conditions. This prevents premature blocking or partially different draining of the filter cake.
Monofilaments are used to minimize adhesion of the filter cake on the filter cloth. These fabrics do not wrinkle because they are relaxed on rollers at high temperatures, so-called thermosetting.
If the particles are much smaller than the mesh size, filtration can only be achieved with multifilaments. No mesh openings are visible and the suspension has to flow through the fiber filter matrix, where the very fine particles are filtered. Multifilament cloths have a rough surface, though, and therefore the filter cake can adhere better. Calendered multifilament cloths are an improvement. The fine fibers are lowered, as with ironing, to reduce adhesion.
The combination of a fabric with mixed filaments is the optimum solution here for filtering smallest particles with multifilaments while still achieving low adhesion of the filter cake.
The intake hole with the cloth neck can be centered or in the middle for filter plates. Putsch® offers the right filter cloths for all plate types.
The cloth neck has to have sturdy seams to offer support against abrasive suspensions. Good quality really becomes evident during cleaning with a pressure washer. The single seam on Putsch® filter cloths already has a high quality as a standard and is superior to many competitors products.
To increase sealing at the edges and to protect the cloth for plates with tappets, an optional felt strip can be sewn on.
In case of encrustations at the edges in the sealing area or in case of sedimentation in the cloth neck, these areas are protected with a rubber coating.
All common options are available for attaching the filter cloths:
– Laser-cut holes
– Brass or stainless steel eyelets
– Hook-and-loop closures
– Cords
The laser processing makes the filter cloth more resistant for subsequent washing. The fibers at the cut edges of the fabric cannot come loose. The surfaces are abrasion-resistant and do not fray, which has a lasting effect on the service life of the filter cloths during the cleaning process. This has been confirmed to Putsch® by many customers.
| Technical data | Filter cloths |
|---|---|
| Material | Polypropylene |
| Cloth neck material | Polypropylene (single seam) |
| Air permeability | 3 – 1500 l/min dm² at 20 mm |
| Dimensions | 250 – 1000 mm edge length (others available on request) |
| Max. operating temperature | 70 – 95 °C for water-based applications |
| Application examples | Wastewater systems in electroplating and chemical industry, purification plants |
Use our extensive range of services for solid/liquid separation. Your contact can help you with any questions and problems.
Please send any inquiry and order to filtertechnik@putsch.com.
| Phone: | +49 (0) 23 31 / 3 99 1 53 |
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Customer Service Center
| Phone: | +49 (0) 23 31 / 3 99 – 1 50 |
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Emergency number
If you need to contact us in emergencies outside office hours, the responsible Putsch® employee will be informed immediately and the required measures for solving your problem will be initiated.
| Phone: | +49 (0) 23 31 / 3 99 – 0 |
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Filter presses from Putsch® are pressure filtration system for solid/liquid separation. The complete systems are planned and manufactured to customer requirements by experienced specialists.
At the main factory in Hagen, Putsch® has been manufacturing filter presses which use filter plates for many decades.