String-wound filter cartridges
Putsch® offers a very large selection of string-wound filter cartridges in many sizes, designs, materials and winding patterns.
Putsch® metal mesh filter cartridges type “MGG” and “MGP” are used where polypropylene filter cartridges are unsuitable, e.g. at high operating temperatures or in combination with specific chemicals. The smooth “MGG” version as well as the pleated “MGP” version are made completely of stainless steel and therefore especially robust. As all other Putsch® filter cartridges, the metal mesh filter cartridges type “MGG” and “MGP” are manufactured with high precision and under strict monitoring, exclusively in Germany.
The metal mesh filter cartridges type “MGG” and “MGP” consist of a robust stainless steel support core covered with metal mesh. Stainless steel caps are welded to both ends, with the respective adapters and seals. Type “MGG” is a smooth mesh, while type “MGP” has pleated mesh. The pleated version has approx. three times the mesh surface of the smooth version and accordingly achieves a longer usable period until blockage.
The metal mesh is the heart of these filter cartridges. The mesh is manufactured by renowned German weaving mills. Warp and weft microwires are used to weave precisely defined meshes which retain the particles to be filtered. The filter action is clearly defined by the mesh size and symmetry.
Depending on the filter grade, different weaving patterns as well as extremely fine, high precision metal wire are used. Only selected weaving mills ensure that the metal mesh is free from tension and dimensionally stable, with evenly sized openings to provide effective filtration from a precisely defined particle size.
The finer the mesh, the thinner the metal wires. For this reason, Putsch® supplies certain weaves and filter grades with an additional, welded protective mesh which has been proven to significantly extend the useful life of the filter cartridges.
The contaminations are retained on the intake side. The smooth mesh surface means that loose dirt can easily be rinsed off. To extend the service life of these filter cartridges, Putsch® recommends an external backflushing support made of a coarser mesh, if the filter cartridges are to be flushed with clean liquid against the flow direction. This allows a much higher flow rate than in filtration direction and any dirt is removed more effectively and faster. The mesh is secured with a backflushing support to protect against destruction. The smooth filter cartridges type “MGG” are much easier and faster to clean.
The metal mesh filter cartridges are fully plasma welded, oil-free and thermally degreased. The end caps and the lengthwise seam are free from adhesives and also professionally welded, making the filter cartridges reliable and free from weak points.
Thanks to the sturdy design and single-piece production, the filter cartridges can resist pressure surges and can also be treated with sterile steam.
The filter cartridges, which are open at both ends (OE), are equipped with standard flat PTFE seals (Teflon®) in the grooves. Teflon® is a thermally and chemically resistant sealing material and provides extremely reliable sealing for the majority of applications.
As an alternative, Putsch® also offers other adapters, e.g. with thread or with P7. Different suitable versions are available depending on the cartridge housing type.
A vast selection of filter grades from 1 µm to 1000 µm is available, whereby it has to be taken into account that the free filter surface decreases as the filter grade increases: The flow of the liquid is not only restricted by the finer mesh, but primarily by the lower free surface of all mesh openings. The pleated mesh cartridge type “MGP” is ideal for increasing the mesh surface, so that the flow is not restricted on very fine meshes while the useful life is increased.
The filter cartridges are made from stainless steel and therefore not only resistant to corrosion, but also ideal for use with food.
No substances that could interfere with adhesion, e.g. silicones, are permitted in paint coating systems, among others. All components are therefore free from silicone.
Putsch® develops special solutions for you, with custom lengths or special designs – following customer sample or drawing. In addition to the usual standard dimensions, special filter cartridges can be developed and manufactured for special applications. As even the standard filter cartridges are manufactured in precision individual production, the additional costs for customized items remain within reasonable limits and the manufacturing process is designed accordingly. Putsch® metal mesh filter cartridges are made from high quality stainless steel and can be cleaned as often as needed, which means they have extremely low wear and have a correspondingly long useful life.
Putsch® offers single layer metal filter cartridges as well as cartridge filters with multi layer mesh structures. For some applications, e.g. in gas lines with high pressure, the multi layer structure significantly increases the support strength which counteracts damage to the filter through pressure surges.
The filter cartridges are open at both ends (DOE) as a standard and the caps are equipped with flat Teflon® seals. These adapters are suitable for cartridge housings with cutting edges.
On request, e.g. threads can be welded on. In addition, a variety of customized special versions are possible.
| Technical data | Metal mesh filter cartridges type “MGG” + “MGP” |
|---|---|
| Filter medium material (mesh, support core, end caps) | Stainless steel 1.4301 |
| Seal materials | PTFE (standard for DOE) |
| Filter grades (standard) | 1 µm – 1000 µm |
| Length of filter cartridges (standard) | 120 mm, 248 mm, 496 mm, 744 mm, 992 mm, 1016 mm |
| Inner diameter | approx. 27 mm |
| Outer diameter | 64 mm |
| Mesh surface metal mesh MGG | Approx. 500 cm2 |
| Mesh surface metal mesh MGP | Approx. 1500 cm2 |
| Max. temperature | Max. 200 °C for water under static conditions (limited by sealing material) |
| Application examples | Hot liquids, solvents, viscous liquids, oxidizing agents (e.g. potassium permanganate, hydrogen peroxide, nitric acid), hot steam |
Recommended filter cartridge exchange at max. 2 bar differential pressure.
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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Cartridge housings type “4” are robust stainless steel filter housings which are modular and accordingly versatile.
Cartridge housings type “6” have been used widely in all industries for over 40 years and are particularly popular due to their solid, robust quality.