The list of some of the main types of filter media that are used to keep products clear, consistent and uncontaminated is given below.
(i) Woven filters:
Woven filters include wire screens and fabrics of cotton, wool, and nylon. Wire
screens, for example, stainless steel are durable, resistant to plugging, and
easily cleaned. Cotton is a common filter, however, Nylon is superior for pharmaceutical
use, since it is unaffected by mold, fungus, or bacteria and has negligible
absorption properties. A bag filter is a common example of this type. Bag
filters come in several different varieties and are best suited for situations
where large solids must be removed from a liquid. In this scenario, the liquid
would flow through the bag and the solids would get caught inside. Bag filters
may be made from a variety of different materials, and are usually available in
different lengths and micron ratings to suit whatever job you need them for.
(ii) Non-woven filters:
Filter paper is a common example of a non-woven filter medium since it offers
controlled porosity, limited absorption characteristics, and low cost. A panel
filter is a non-woven type filter. It is an industrial filter that may come in
a variety of different shapes and sizes, depending on the application. In the
majority of cases, panel filters are plain and are found inside ventilation or
air conditioning units.
(iii) Membrane filters:
Membrane filters are basic tools for micro-filtration, useful in the
preparation of sterile solutions. These filters are made by the casting of
various esters of cellulose, or from nylon, Teflon, and polyvinyl chloride. The
filter is a thin membrane with millions of pores per square centimeter of
filter surface. A cartridge filter is cylindrical, but occasionally it looks
flat. Cartridge filters use a barrier/sift method to remove sediment and
harmful solids from liquid. Some cartridge filters are designed to remove microscopic
elements and some are designed to stop larger particles from getting into the
finished product. Membrane filters are cartridge units and are economical and
available in pore sizes of 100 µm to even less than 0.2 µm. They can be either
surface cartridges or depth-type cartridges. Surface cartridges are corrugated
and resin-treated papers used in hydraulic lines.
For example, ceramic
cartridges and porcelain filter candles. They can be reused after cleaning.
Depth-type cartridges are made-up of cotton, asbestos, or cellulose. These are
disposable items since cleaning is not feasible.
(iv) Porous plates:
These include perforated metal or rubber plates, natural porous materials such
as stone, porcelain or ceramics, and sintered glass. Sintered glass, sintered
metal, earthenware, and porous plastics are used for fabrication. These are
used for their convenience and effectiveness.
(v) Hydraulic Filters:
Hydraulic filters are industrial filters that are designed to purify
petroleum-based liquids such as oils. These types of filters are often found in
different hydraulic systems to prevent a breakdown caused by oil impurities.
Hydraulic filters can also be used to purify water-based liquids.
(vi) Strainers:
Strainers often become part of the manufacturing process when the process
contains solids that are too large to be caught up in other types of filter
media. Strainers consist of baskets that can be removed and cleaned out
regularly to prevent them from being stuck inside. Some strainers can be
cleaned without interrupting the system, while others cause some disruption
each time when they are cleaned.
(vii) Air Filters:
Air filters are an important part of most industrial processes, as they remove
dust, dirt, and other particles from the air. Most air filters consist of a
mesh that catches the particles when air is forced through. If the air is to be
protected from gases and odors as well as particles, a high-efficiency
particulate air filter is used.
(viii) Gas Filters:
Gas filters are a type of industrial filter that helps to remove contaminants
or particulates from a dry or liquid gas stream. Depending on the situation,
the contaminants may be solid or liquid. Some of the different elements and
accessories for gas filters include gas filter separators, coalescers, and gas
scrubbers.
Type of filter media, characteristics, and their application
|
Type
of filter media |
Characteristics |
Application |
|
Metal
fiber media (non-woven metal fiber). |
Excellent
durability, corrosion, and abrasion resistance. |
Polymer
and gas industry. |
|
Multilayer
sintered mesh. |
It
can be reused. |
Gas
industry. |
|
Stainless
steel (plain, twill, and Dutch type) |
Waterproof
inside and plastic weaved cloth outside. |
Oil,
chemical, food, pharmaceutical, and aviation industry. |
|
Anthracite
filter media. |
It
has high efficiency. |
Water
purification. |
|
Filter
media is treated with graphite. |
Made
up of fiberglass. |
Used
in cement and steel industry. Used as filter cloth for the air filter. |
|
Activated
carbon fabric (non-woven type) |
Little
air current resistance, strong strength. |
Used
in an air conditioner as an auto air filter or carbon air filter. |
|
Aramide
filter fabric |
Easiness
of cake peeling, high stability, anti-distortion. |
Used
in one dressing, chemical, and brewing industry, equipped in filter presses,
vacuum filters, etc. |
|
Autoroll
filter media |
It
has a metal structure, saves energy, and works stably. |
Used
in air filtrate. |
|
Air
filter |
Pocket
type of filter. |
Air
conditioning and electronic industry, food industry, applied to the
pre-filtration of coarse efficiency. |
Make sure you also check our other amazing article on : Factors Affecting Filtration