Making More of Filter Efficiency

Related Vendors

Glatt Ingenieurtechnik GmbH

Italvacuum, Srl

TRM Filter d.o.o.

To achieve high flow rates without losing retention performance, development of different asymmetric composites have been done in the past. These are powder/powder, powder/screen, fiber/screen and powder/fiber composites. All these different types have their special advantages as well as limitations. In many cases, only the fiber/screen composite has found its own market for filter applications.

Debottlenecking

Debottlenecking: Exploiting Opportunities to Boost Performance

Economic Performance Spells Success for Filters

The reasons why the other types did not really succeed are both technical and economical. The new product called SIKA-R AS (ASYMMETRIC) is a powder/powder composite consisting of a coarse metal powder, which is the support material and a thin active filter layer (< 200 μm) of the same alloy. The support material is produced by axial pressing for plate geometries and isostatic pressing for filter cartridges.

The thin metallic membrane is applied by a separate process step. The support material and active filtration layer are diffusion bonded during the sintering process. The newly developed AS process is a P/M process to produce porous structural parts and coatings and allows the processing of very fine metal powders.

Characteristics of Metallic Filter Membranes

An asymmetrically designed membrane has different properties from conventional filter elements. Two advantages of the asymmetric design are easily seen. The first one is the lower pressure drop during the filtration and the second is that this low pressure drop makes it easier to clean the filter element during the back flushing step. This results in improved permeability as seen in Figure 1.

Gallery

Besides the low pressure drop, the particle retention behaviors are one of the most important characteristics of filter elements. The different grades of metallic membranes that can be delivered are SIKA-R 0.1 AS, SIKA-R 0.5 AS, SIKA-R 1 AS and SIKA-R 3 AS.

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