Liquid Filter Media Paper

Liquid Filter Media Paper

Wetlaid Liquid Filter Media Choices Wetlaid media, among the most common fine filtration media today, are generally produced on a paper machine with cellulose, synthetic or glass fibers. There are many fine filtration media available to the filter designer. Some media are dry laid, some wet...

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Wetlaid Liquid Filter Media Choices

Wetlaid media, among the most common fine filtration media today, are generally produced on a paper machine with cellulose, synthetic or glass fibers.

There are many fine filtration media available to the filter designer. Some media are dry laid, some wet laid, and others are composites of several types. Monofilament woven meshes, nets, and membranes also continue in common use for a wide range of applications.

Wet-laid media, among the most common fine filtration media today, are generally produced on a paper machine with cellulose, synthetic or glass fibers. It is common for media to be produced with one or more fiber types. Wet-laid media can be designed with nominal or absolute filter ratings. These media typically contain binders, which can have chemical and thermal limitations and higher extractables when compared to air-laid media made without binders. Wet-laid media can also be made using FDA-compliant materials.

Cellulose-based media is generally lower cost with nominal efficiencies above 5 μm and low dirt holding capacity. Cellulose fibers are coarse and flat which produces a dense, mostly two-dimensional structure with highpressure drop. A typical wet-laid nonwoven cellulose filter medium is shown in Figure 1.


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Figure 1 is a typical wetlaid cellulose nonwoven media.

The addition of synthetic fibers to cellulose will significantly improve the filtration performance by opening up the structure and adding finer cylindrical fibers to the matrix which do not surface load as readily. Figure 2 is a wet-laid cellulose/synthetic blend in a nonwoven medium.


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Figure 2. Cellulose Synthetic Blend @100x

Wet-laid media produced with 100% synthetic or glass fibers will generally result in a very three-dimensional sheet with lower pressure drop and higher dirt holding capacity. Specifically, microfiberglass media can be produced with the broadest range of filtration capability and efficiencies due to the wide range of fibers available. Figure 3 is a photograph of wet-laid microglass medium.


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Figure 3. Wetlaid Microglass @ 100x

As can be seen in the above images, wet-laid structures can be used in many configurations, depending on the requirements of targeted applications. Pore sizes can range from tens of microns down to fractions of a micron, and media can be combined for specific purposes driven by the application.


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