A pneumatic filter is a device which removes contaminants from a compressed air stream. This can be done using a number of different techniques and tools, such as a membrane that only allows air to pass through, or a "media" type that traps particulates but allows air to pass through to a Venturi tube.
It is now common to have various stages of filtration employed in a filter-regulator-lubricator form factor, usually with the different filter housings connected. Air filtration applications are diverse and include end-user sectors such as cleanroom environments,[1] biomedical, analytical instrumentation, food processing, marine and aviation, agriculture, manufacturing, food and beverage packaging and a host of other uses.
Primary filtersedit
Typical commercial pneumatic filters will remove particles as small as 5 micrometres from the air. The filters protect pneumatic devices from damage that would be caused by these contaminants. These contaminants include lubricant particles ejected by the compressor, dirt particles, small water droplets or aerosols.
Secondary filters & membrane air dryersedit
Secondary filters are used for a variety of applications and can remove particles as small as 50 nanometres in size. These secondary filters can remove fumes, odors, vapor, mist, moisture, oil, and tiny particles from the air stream.
In addition, special "point-of-use" air drying devices (called membrane air dryers) may be used to depress the pressure dewpoint by selectively passing water vapor out of the compressed air stream as it passes through the inside hollows of a bundle of narrow, thinly-coated, membrane fibers. A small amount of "sweep air" must then be purged around the outside of the bundle of hollow fibers carrying the compressed air. Purge or "sweep" air is thus expanded (to atmospheric pressure) and subsequently vented to the atmosphere. The "dryer" purge air which is carried or swept along the outside of the hollow bundle of fibers creates a vapor pressure gradient between the "wet" compressed air on the inside the fibers and the "dryer" sweep air on the outside the bundle. This results in delivery of cleaner, dryer air before the compressed air is sent into any "moisture-sensitive" equipment(s).
Membrane air dryers, however, may be easily damaged through any contact with liquid droplets (water or oil) so they should be protected with a high-efficiency coalescing (nano) air filter, positioned either immediately upstream (or integrated within) the membrane air dryer housing. Membrane dryers are primarily used with equipment's that are especially sensitive to water vapor such as paint booths, two-part mixing equipment (polyurethane sealants), polyurethane dispensers, PUR-applicators (edge-banding equipment), laser-cutting machinery, CMM's, industrial ink-jet printers, or even for laboratory use.
Referencesedit
^Kolstad, Charles (28 November 2022). "What Is a Pneumatic Filter?". Tameson.com. Retrieved 12 February 2024.
January 01, 1970
pneumatic, filter, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, february. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Pneumatic filter news newspapers books scholar JSTOR February 2024 Learn how and when to remove this message A pneumatic filter is a device which removes contaminants from a compressed air stream This can be done using a number of different techniques and tools such as a membrane that only allows air to pass through or a media type that traps particulates but allows air to pass through to a Venturi tube Contents 1 Usage 2 Primary filters 3 Secondary filters amp membrane air dryers 4 ReferencesUsage editIt is now common to have various stages of filtration employed in a filter regulator lubricator form factor usually with the different filter housings connected Air filtration applications are diverse and include end user sectors such as cleanroom environments 1 biomedical analytical instrumentation food processing marine and aviation agriculture manufacturing food and beverage packaging and a host of other uses Primary filters editTypical commercial pneumatic filters will remove particles as small as 5 micrometres from the air The filters protect pneumatic devices from damage that would be caused by these contaminants These contaminants include lubricant particles ejected by the compressor dirt particles small water droplets or aerosols Secondary filters amp membrane air dryers editSecondary filters are used for a variety of applications and can remove particles as small as 50 nanometres in size These secondary filters can remove fumes odors vapor mist moisture oil and tiny particles from the air stream In addition special point of use air drying devices called membrane air dryers may be used to depress the pressure dewpoint by selectively passing water vapor out of the compressed air stream as it passes through the inside hollows of a bundle of narrow thinly coated membrane fibers A small amount of sweep air must then be purged around the outside of the bundle of hollow fibers carrying the compressed air Purge or sweep air is thus expanded to atmospheric pressure and subsequently vented to the atmosphere The dryer purge air which is carried or swept along the outside of the hollow bundle of fibers creates a vapor pressure gradient between the wet compressed air on the inside the fibers and the dryer sweep air on the outside the bundle This results in delivery of cleaner dryer air before the compressed air is sent into any moisture sensitive equipment s Membrane air dryers however may be easily damaged through any contact with liquid droplets water or oil so they should be protected with a high efficiency coalescing nano air filter positioned either immediately upstream or integrated within the membrane air dryer housing Membrane dryers are primarily used with equipment s that are especially sensitive to water vapor such as paint booths two part mixing equipment polyurethane sealants polyurethane dispensers PUR applicators edge banding equipment laser cutting machinery CMM s industrial ink jet printers or even for laboratory use References edit Kolstad Charles 28 November 2022 What Is a Pneumatic Filter Tameson com Retrieved 12 February 2024 Retrieved from https en wikipedia org w index php title Pneumatic filter amp oldid 1206590318, wikipedia, wiki, book, books, library,
