The first image of a vacuum cleaner in our mind is a machine which is able to suck up dust and dirt. But sucking dirt is not the only function of a vacuum cleaner. a vacuum cleaner has following functions:
– Sucking up air and dirt
– Collecting air born particles and dust
– Filtering tiny particles
– returning filtered air to the surrounding environment
So one of the most important parts of every commercial and industrial vacuum cleaner is its filter. If the vacuum cleaners filter is not efficient enough, the dust will return to the air and the air quality is lost. There are different vacuum cleaner’s filters which can be categorized depending on various parameters.
vacuum cleaners filter shape
the most obvious difference between filters is their shape. There are different filters shape including:
This filter is the simplest kind of filters which is usually used in commercial vacuum cleaners. Bag filters have small filtration surface and they are suitable for cleaning small areas. Although bag filters are cheap and efficient, they occupy considerable space of the vacuum cleaner container.
This filter is one the most popular filters in industrial vacuum cleaners. The special design of this filter provides the widest filter surface in the least space and increases the filter’s efficiency.
The idea of cartridge filter design is based on maximizing filter surface in a filter cage with defined size. These kind of filter are produces as conical shape or cylinder.
In order to increase filtration efficiency, a set of pocket filters is used in some industrial vacuum cleaners. The pockets are parallel. This arrangement provides a big filter surface.
When we talk about vacuum cleaner filters, one of the main factors is size of particles which filter can trap. Regarding particle size, there are four classes for filters.
The range of particle size is not clear in this kind of filters but it is obvious that these filters cannot filter tiny particle. Bag filters in commercial vacuum cleaners belong to this class.
These filters are able to filter particles as small as 3 microns and they are suitable for industrial vacuum cleaner which are used for sucking up Al or pvc dust.
Particles with size of 1 micron and more can be trapped by filters which belong to this class. These filter are suitable for cement industry.
H class or HEPA
HEPA filter (High Efficiency Particular Arresting) can take out very tiny particles as small as 0.3 micron. These filters are usually used as secondary or safety filter.
When you are collecting special material by means of an industrial vacuum cleaner, the chemical and physical properties of that material as well as its temperature are important. The material which filter is made of, is so important because above parameters can directly effect on it. The filter material can be:
This material is cost effective but it has low resistance against moisture and wear.
The most popular material which industrial filters are made of. It has good resistance against chemical materials, wear and temperature gradients. This material is more expensive than cellulose but it has higher durability.
This filter is made of polyester with a thin cover of PTFE. This filter is not stick so it is suitable for sucking up stiky dust.
This filter is resistant to high temperature and it can tolerate temperature up to 220 centigrade.
This filter is used for sucking up material with static electric charge.