29 Articles found
American Filtration & Separations Society (AFS) Articles
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Next AFS SW Chapter Meeting: Molecular Separators for Promoting Process Separations in Industrial Applications
The next meeting of the Southwest Chapter of the American Filtration & Separations Society is scheduled for Tuesday, July 14, from 1:30 to 2:15 central time. This virtual meeting is free to AFS members and $15 for non-members. The topic will be ...
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Using a Gas Liquid Porometer to Reliably Measure Pore Size and Distribution for Filter Media Used in Face Masks
Surgical masks and respirators are typically made of nonwoven polypropylene fabric and mostly consist of three (or more) layers. The first and third layers are generally spunbond, while the middle layer is meltblown. This composition is commonly ...
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Expanding Wetlaid Filtration Media Performance Through Innovation and Enhanced Product Testing
Wetlaid technology has played a major role in the production of filtration media for many years. Due to its versatility, this technology has been challenged and continues to evolve with many advances allowing it to produce more and more unique ...
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It’s Time to Push for Greater Use of Higher MERV-Rated Air Filters
Technological advances over the last 30 years have increased the amount of sub-micron particles in the air we breathe. Manufacturing processes, material off-gassing and emissions are all adding to the airborne particulate matter that human bodies ...
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Is There a Place for Filtration in Our World in 2050?
Our world is changing faster than ever. How does this change affect filtration, and is there room for filtration in our world in 2050? This provocative title suggests that we can expect massive impacts from various megatrends such as new mobility, ...
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Novel Filtration Design Leads to Amine Process Success
For natural gas processing plants, amine scrubbing is a common unit process that relies heavily on filtration and separation technology. It is well documented that solid contaminants contribute to process challenges such as corrosion, erosion, ...
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World Filtration Congress Environment Symposium Focuses on Technologies That Combat Air and Water Pollution
Co-chaired by Prof. Chao Tan and Dr. Shagufta Patel, the Environment Symposium at the 13th World Filtration Congress will focus on the role of filtration and separation to remove the ever-increasing volume of contaminants in earth’s air and ...
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Hurricane Florence Foils AFS 2018 Fall Conference in Charleston, SC
A bit ironic, but attendees at the American Filtration & Separations Society (AFS) Fall Conference, who were in Charleston to dive deep into the transportation industry, found themselves experiencing a more intense transportation schedule than ...
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The Impact of Filters in the Automotive Industry
The use of filtration in the transportation industry is so significant that are devoting an entire conference to it. We hope to see you next week at the AFS Fall Conference: Filtration on the Move – Protection for the Automotive and Aerospace ...
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Filter aids
Filter aids are used to assist filtration of colloids, extra fine particles, gel like, and highly compactible materials, which are difficult to be filtered due to low filtrate rate, unacceptable filtrate clarity, high cake moisture content, or ...
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What is the size distribution and sources of particles in ambient air?
The particle sizes in the ambient air are ranged from 1 nanometer to slightly more than 10 micrometers. There are three modes: coarse, fine and nano. The course mode particles are road dusts, spores and pollens. The minimum sizes of these particles ...
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What is an Electret?
Electret is a counter term of magnet. A magnet is a ferrous material that possesses a quasi-permanent internal and external magnetic field. An electret is a dielectric material that possesses a quasi-permanent internal and external electric field. ...
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What are filter aids?
Filter Aids” is a group of inert materials that can be used in filtration pretreatment. There are two objectives related to the addition of filter aids. One is to form a layer of second medium which protects the basic medium of the system. ...
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Water contamination in fuel: cause and effect
Water exists in three physical states and depending on the surrounding conditions it finds its way to the fuel systems like the high pressure common rail (HPCR) fuel systems on diesel engines. The important point thereafter is to provide the best ...
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Beta ratios explained and applied to liquid filter selection
Liquid Filter Beta Ratios: Absolute rated liquid filter selection is tied to the media micron rating, materials of construction, construction design, and particulate removal efficiency filter factor known as its Beta Ratio (Figures 1, and 2). ...
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Air filtration applications for membranes
Given their unique performance attributes membranes are finding use in a growing number of high efficiency air filtration applications. One example is in respirators and personal protective equipment. Applications where intense physical demands and ...
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Can protective garments be wearable filters?
Protective garments for medical, civilian safety and military applications range from disposable lightweight fabrics to multilayered fabrics and laminated barrier materials, depending upon the nature of the contamination that threatens the wearer. ...
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Combination filters
Simply defined, a combination filter is one that does at least one other processing job at the same time as filtering a suspension. The classic example, of course, is the packed bed of activated charcoal, which acts as a remover of chemical ...
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What is slip-flow and how does it affect filter performance?
Recent scientific interest in nanofibers have many people exploring their use in filter media. One of the advantages of nanofibers for gas phase depth filtration is the slip-flow phenomena. The purpose of this article is to describe what ...
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Coagulation, flocculation and agglomeration
Agglomeration Agglomeration refers to the formation of more or less firmly bound primary particles by collision processes between primary particles, primary particles and agglomerates, as well as pre-existing agglomerates. The agglomeration ...