Custom Pocket Filters Choice for Your Project
Filson pocket filters are also known as pocket air filters or pocket bag filters which are mainly found in HVAC systems for auto shops, clean rooms, food & beverage plants, electronic industry and various industrial sites.
Comparing to a non-pleated panel filter, Filson pocket filter captures more airborne contaminants, leading to a better air condition and filtration efficiency for the workplaces. At the same time, pocket filters allow less change frequency.
Filson pocket filters perform well in dust removing and air quality conditioning. Sometimes, they are also used as a prefilter for high efficiency air filters to decrease their heavy duty and prolong the service life.
As one of the leading brands of filtration in China, Filson is committed to designing and manufacturing best and custom pocket filters for our clients all over the world. No matter how unique your requirements are, our experienced engineering team will provide an ideal solution.
Filson Pocket Filters
Why Filson Pocket Filters are Trusted by Worldwide Customers
Filson, a professional pocket filter manufacturer, always pays great attention to customers’ practical needs. Whether for large dust particles removal or fine dust impurities filtration, Filson pocket filter shows great advantages.
Filson chooses the best raw material as the basic media of the pocket filters to achieve the desired filtration efficiency and accuracy even down to 0.3 micron. With the quality product, you can handle any polluting challenge of your business more easily.
Filson: Professional Pocket Filters Advisor for Your Application
Filson pocket filter is an efficient device applied to filter airborne dust and improve air quality, with a pocket design, it is also called a pocket bag air filter or pocket filter bag. The structure is quite simple, as you can see, it is composed of a frame and pockets in different quantities.
The frame, as known as the header, helps gather and fix the pockets of Filson pocket filter. In order to eliminate the risk of corrosion, the frame always adopts plastic as raw material. And according to specific requirements, galvanized steel, aluminium or stainless steel are also available to build the frame.
When it comes to the pocket of Filson pocket filters, you are given plenty of choices for the pocket size, material, color and number. Typically, the pocket is made of non-woven fabric, synthetic, fiberglass or activated carbon to meet your different application needs.
Filson provides three levels of pocket filter, including primary pocket filter, medium efficiency pocket filter and high efficiency pocket filter ( HEPA pocket filter ). View the following passage and find whether Filson pocket filters are suitable for your application.
Filson pocket filter is sometimes also regarded as rigid pocket filter for its stability of the pockets. Since the pockets are made of quality material with multiple layers, they are self-supported and strong enough to withstand high air stream and extreme humidity.
Under the support of advanced technologies and specialized pocket filter machine, Filson pocket filters are guaranteed to suit any application where clean air environments are required. And it’s worth mentioning that these filters can work under high temperatures up to 80°C.
Filson pocket filter is designed with large filtration rating including MERV 11, MERV 13, MERV 15 and other efficiency levels based on request. With excellent dust removal performance, pocket filter is good at capturing impurities like mold spores, cement dust, lead dust, humidifier dust, coal dust, bacteria, most smoke and insecticide dust.
MERV refers to minimum efficiency reporting value. It is used to describe the filtration rating of the pocket filters. The higher MERV level of a pocket filter is, the better efficiency it stops contaminants.
For example, MERV 11 stands for efficiency of 65%, MERV 13 stands for efficiency of 85% and MERV 15 stands for efficiency of 95%. Of course, the values are not absolute, they varies from one situation to another.
Filson provides pocket filters with different sizes, so you can choose the suitable product dimension to match with your system and dust collection task. All our pocket filters are designed with depth-loading pocket and synthetic media to offer an exceptional dust holding capacity.
What’s more, Filson pocket filter consists of non-shedding fibers, reducing the possibility of secondary pollution and stopping the growth of bacteria. Meanwhile, the filter is enhanced to resist moisture and bear chemicals.
Filson pocket filter is generally vertically mounted to avoid captured material back into the air stream. At the same time, the frame sides are sealed well to prevent leakage of both dust and air flow.
When you find that the filtration efficiency of a pocket filter is not as good as usual after a period of using, then Filson suggests you to clean it or replace it with a new one. Basically, the lifespan of a pocket filter is about 3 – 4 months.
If you still want to know more information about Filson pocket filter or need some assistance on daily maintenance, just feel free to contact us. Our reliable engineering sales are waiting for your inquiry in 24/7.
Filson Pocket Filters Function:
- Enhance air quality by effectively removing dust
- Keep working condition safe and clean
- Prevent expensive equipments downstream from being damaged
- Remove both large and fine dust existing in the air
- Reduce the heavy duty of the final high efficiency air filter
- Decrease maintenance times and costs
Filson Pocket Filters Feature:
- Standard and custom sizes for particular application needs
- Ultrasonic sealed pockets to ensure consistent air flow
- Galvanized and rigid frame for stability and durability
- High dust retention quality leading to efficient dust removal
- Clear and high level air quality ensured due to superior performance
- Large filtration area and large dust holding capacity
- Uniform and steady air flow passing through the filter
- Longer service life and lower operating costs
Filson Pocket Filters Specification:
- Pocket material: non-woven fabric, synthetic, fiberglass, activated carbon
- Frame material: galvanized steel, aluminum, stainless steel, plastic
- working temperature: 80°C
- operating humidity: 80%
- Number of pockets: 3 – 12
- Filtration rating: MERV 11, MERV 13, MERV 15
- Filtration efficiency: 90% – 95%
- Filter size: 24 x 24 x 15 for example
- Media color: black, pink, orange, yellow, green, white
Note: various sizes of pocket filter can be customized according to your requirements.
Filson Pocket Filters Application:
- Clean room filtration system
- HVAC systems
- Automotive plants
- Commercial buildings
- Pharmaceutical industry
- Food and beverage plants
- Electronic industry
- Paint spray plants
- Heavy and metal industry
- All industrial processing workplaces
Pocket Filters:The Complete Guide
Probably, you would like to invest in better pocket filters for your systems.
Or, maybe learn more about technical specifications, design, working principle and benefits, among other critical aspects.
If so, then this guide is specifically for you.
Here, you will find every answer you need concerning a pocket filter.
Without wasting much time, let’s start the process of making you an expert on pocket filters.
A pocket filter refers to filter with a pocket like filter elements which are of fabric.
They are used to filter solid particles in gases that contain dust.
There are several designs of pocket filters available in the market for various applications.
Pocket filters – Photo courtesy: Advanced Filtration Concepts
Even though the standard material for pocket filters is fabric, there are other materials available for pocket filters that still function the same.
We shall learn about this later in the chapter.
The nature of the solid particles that these filters remove implies that the filter element should have tiny pores.
This ensures adequate filtration of your gas.
Advantages of Pocket Filter
For effective filtration, you will find pocket filters as a critical component.
Several benefits come with the use of a pocket filter.
Pocket filter systems
Among these advantages include:
1. Efficiency in filtration
Pocket filters have a filtration efficiency of up to 99% which is relatively high than other types of filters.
This efficiency allows for precise filtration of tiny dust particles present in your gas.
The result of this is that you obtain highly purified gas which you can use in various applications.
2. Simple to operate
Operating pocket filters is relatively simple.
All you need to understand is the operating mechanism as well as the cleaning procedure of these pocket filters.
Pocket filters don’t utilize a lot of voltage meaning that you don’t have to worry about your electricity bills.
3. It is the preferred option for fly ash
Pocket filters are a preferred option when it comes to filtration of gases containing fly- ash.
It’s because they are ideal in the collection of resistive particles.
Disadvantages of Pocket Filters
Just like the use of other devices, there are a few disadvantages that you will experience while using this device.
These disadvantages are few when you compare with the advantages which mean you don’t have to avoid this device.
These disadvantages include:
1. Limitation to temperature
Most pocket filters consist of woven or fiber filter element material.
These materials operate correctly within a given temperature range.
Operating these filters beyond a given temperature degrades them or causes the protective finishes to be volatile which in turn affects their filtration efficiency.
This becomes a limitation when you want to filter hot gases that are beyond a particular temperature.
2. Maintenance requirements
When you compare to the other types of filters pocket filters require a high level of maintenance.
This includes frequent replacement of the pocket filter element.
The maintenance requirements could be costly especially if you did not budget for them.
If you are planning on purchasing a pocket filter for your application, you need to factor these costs.
Operating environment The reason for this is because such an environment may cause the fabric of the pocket filter to plug or crusty caking of the fabric.
Pocket Filters Construction and Design
Understanding the design of a pocket filter is quite simple since it consists of a few parts.
Basically, these parts include:
A pocket filter basically consists ofthree main parts.
That is the pocket frame, the pocket rings, and the stitched pockets.
Each of these parts has a role to play in ensuring efficient filtration of your pocket filter.
The pocket frame is the outer part of your pocket filter which is mostly of steel.
This frame protects the other components holding them firmly.
Also, the frame ensures that the components are in place when pressurized fluid flows into the pocket filter.
The pocket rings are the points at which the pockets stitchto the frame.
They are generally j-shaped and surrounds the frame.
These pocket rings provide an additional layer of firmness t the pocket filter which ensures the pockets don’t detach during filtration.
Lastly, you have pockets. The pockets can be of different materials such as woven, non- woven material or even fiber.
3. Certain environments are not conducive to the effective working of your pocket filter.
For instance,the moist or hygroscopic environment is not ideal for the efficient operation of your pocket filter.
Pocket filter design
The pockets are where the actual filtration takes place.
They have filter elements which filter the fluid ensuring removal of all the contaminants.
The pockets are wedge-shaped which enhances filtration of your fluid.
From the design, it is easier to understand the fabrication process of pocket filters.
Generally, it consists of the following steps.
First, is the shaping of a material which can either be woven or non-woven into pockets.
The pockets have a wedge-like shape with the opening being wider than the bottom.
Also, the purpose of this is to ensure maximum filtration as the fluid flows through it.
Depending on which size you want, you may have big or small pockets.
Next is sewing of the pockets into pocket rings.
As we have explained earlier, the function of these pocket rings is to offer support to the pockets.
You need to sew the pocket rings all along the pockets ensuring they are firm.
Lastly, you have to attach the pocket rings to the frame.
The frame may either be rectangular or square.
The frame plays a vital role in holding all the components together.
This ensures that during filtration, the pockets do not detach thus facilitating the filtration process.
So, how does a pocket filter work?
The answer to this is vital in understanding the benefits of this equipment.
It is crucial also, in understanding how to repair it in case of any malfunctioning.
Here is how a pocket filter works.
How pocket filter works
A pocket filter consists of numerous pocket elements that usually are either square or a rectangular
. Filtration of the media happens on the filter cloth surface as the filtered media flows out.
What happens is that gas containing dust flows into the pocket filter via the inlet by either positive pressure or suction.
The air flows to the pocket filter compartments.
Here, the heavy dust particles present in the gas fall off at the entrance while the gas is flowing.
The lighter dust particles together with the gas flow upwards to the pocket filters.
The gas is drawn either on the outside on the inside depending on the method of cleaning you will be using.
On the other hand, dust accumulates around the filter element which in turn causes an increase in the flow of the gas.
As a result, you need to constantly clean the pocket filter, especially where you notice the occurrence of a pressure drop.
When it comes to cleaning the pocket filter, there are various methods you can use to achieve this.
That is a pulsative reverse pressure method and the pulse- jet method.
Pulsative reverse pressure method refers to introducing air flow in the opposite direction under pressure.
By using this method, the pressurized airflows from the filter side which is clean penetrating the filter element.
As it flows, it knocks off the dust particles on the outer filter element.
As it does this, it cleans the filter element and its surface ensuring that the pocket filter remains clean during the filtration period.
Working of filter
The other method of cleaning your filter is through the use of pulse- jet method.
This is perhaps the conventional method of cleaning your filter.
This method involves the use of pulsed reversed air which causes the filter element to expand.
Remember, this distributes the particles mechanically evenly across the filter element.
After that, the pressurized reversed air removes the dust particles from the filter element.
Pressurized reversed air is the most effective method of cleaning your pocket filter.
The advantage of this method is that you can fabricate it into a continuous duty cleaning method.
Besides, this will allow you to continue with the filtration of your gas without having to stop for cleaning purposes.
Pocket filters are an efficient way of filtering gas since they have an efficiency level of 99%.
The layer of dust that collects around the fabric facilitates this.
Technical Specifications of Pocket Filters
There are several details that you need to pay attention to for the effective working of your pocket filtration systems.
These specifications may vary depending on the size of your pocket filter, your filtration fluid as well as the size of the contaminants.
Pocket filter structure
Let’s have a look at these specifications.
· Pocket filter materialz
Pocket filters can either be of woven or nonwoven material.
Woven filters mostly consist of yam with a definite, repeated pattern.
Woven filter materials are common in applications that require low cleaning energy.
On the other hand, felted filters consist of randomly placed fibers and compressed to a mat which is attached to a woven backing material that is loose.
These materials are common in applications that require high cleaning energy.
A membrane filter material refers to a thin porous membrane that has specialtreatment bonding it to support fabric.
The development of this material is to enhance the efficiency of filtration.
You need to ensure that the filter material that you select will fit and function appropriately.
· Frame size
The frame size of a pocket filter is a consideration that you cannot ignore when selecting your pocket filter.
Also, the frame supports your pocket filter and also provides a point of fixation to your application.
As such, you need to ensure that your frame is sturdy and durable.
A durable and robust pocket will be able to hold the other component of your pocket filter.
· Nominal volumetric flow
Nominal volumetric flow refers to the measurement of the volume of fluid flowing through the pocket filter at a given pressure.
Typically, the measurement for this is gallons per minute (GPM) or liters per minute (LPM).
It is an important specification when selecting a pocket filter since it will help you choose a pocket filter with the correct volumetric flow.
The nominal volumetric flow needs to match with the flow of the fluid that you want to filter.
Various factors affect the nominal volumetric flow.
They include the size of the pocket filter, the material and the speed of the fluid.
· Pressure drop
Pressure drop which you may also refer to as differential pressure is a critical consideration when designing your pocket filter.
It refers to the pressure difference between the dirty gas side of the pocket filter and the clean side.
The cause of the pressure drop is the resistance to the air flow when it flows through the filter cake and the filtering element.
The importance of this factor is that if the pressure drop is higher, it implies that you will experience high energy cost.
Remember, the fans will consume most of this energy as they try to reduce the differential drop.
The availability of a gauge that measures the differential pressure is critical in ensuring that you have the correct differential pressure for your pocket filter.
However, the pressure sensing lines available in the devices for measuring the differential pressure become clogged over time.
This renders the gauges ineffective.
While purchasing your pocket filter, you need to ensure that you pick one with the correct pressure difference marking.
This ensures that your pocket filter works efficiently
· Number of pockets
Another technical specification that you need to consider is the number of pockets that your pocket filter has.
This is a critical component when it comes to filtration due to the availability of the filter elements.
The higher the number of the filter elements, the more efficient your filtration will be.
However, you need to note that the higher the number of pockets, the higher the cost of your pocket filter.
The number of pockets your pocket filter will have also depends on the size of your application.
Also, the larger the application, the more the number of pockets your pocket filter needs to have.
The role of depth in the filtration of your fluid is that it allows for finer filtration.
As the fluid flows into a pocket filter, contaminants get pulled to the pocket filter element thus filtrating the fluid.
By your pocket filter being deep, it ensures filtration of all the contaminants.
As a result, if you need finer filtration, you need to ensure that you have a deeper pocket filter.
Likewise, if you are looking to get course filtration, you may need to select a shallow pocket filter.
This prevents detail filtration of your fluid.
Not all applications are the same.
Likewise, not all pocket filters are the same in terms of physical length, breadth, and height.
It is therefore imperative that you consider the dimensions of your pocket filter before selecting a pocket filter for your application.
Selecting a smaller pocket filter may have the effect of not fitting appropriately on your application.
This results in poor filtration of your fluid.
On the other hand, you are selecting a pocket filter that is larger than your application results in it not fitting.
In general, you will end up paying more for purchasing the wrong pocket filter for your filtration in terms of dimensions.
The minimum efficiency refers to the minimum level of filtration that your pocket filter can handle.
Thisdepends on a couple of factors.
For instance, it will depend on the quality of filtration you want.
For finer filtration, you will need a pocket filter with finer filtration element.
Finer filter element increases the efficiency level of your filtration.
Also, the efficiency level depends on the type of fluid for your filtration.
Denser fluids will tend to require larger filter element for efficient filtration than when you compare with less denser fluids.
· Dust holding capacity
An important specification that you must consider when selecting a pocket filter is the dirt holding capacity.
Pocket filters have different dirt holding capacities which depend on the size of your filtration.
If your filtration is extensive, you will need a pocket filter with a large dirt holding capacity.
Likewise, if your filtration is small, you will need a pocket filter equivalent to the amount of dirt or a large one.
The importance of this is to avoid disruptions as a result of clogging of your pocket filter.
You will have to stop your operations to unclog the pocket filter element.
Applications of Pocket Filters
Several applications utilize a pocket filter.
From laboratory applications to the pharmaceutical industry, these pocket filters are proving essential to our daily lives.
Here is a look at the applications that utilize pocket filters for better understanding.
· HVAC Systems
The Heating, Ventilation and Air Conditioning System is a common application found in residential and commercial properties.
Its purpose is to create a conducive environment of fresh air.
HVAC System – Photo courtesy: Wikimedia
It does this by suctioning the air from outside and cleaning it while reducing the air temperature to provide a serene atmosphere.
Pocket filters play a critical role in making this possible.
As suctioning of the air takes place, it flows through many pocket filters inside the system where filtration takes place.
Here, removal of all the dust particles takes place as well as any unwanted particle regardless of its size.
This results in clean air which is utilized by the occupants of the building.
Different laboratories utilize pocket filters to filter different products during the manufacturing stages.
In the food and beverages industry, the use of pocket filters is in the filtration of sugars from grains.
Laboratory ventilation system
They are also applicable to the filtration of proteins during the fermentation process.
By having pocket filters of different sizes, you can facilitate the filtration process.
They are also common in the filtration of soft drink, edible oil syrup, and juice filtration.
However, the type of pocket filters to use in these applications vary depending on the nature of the filtration media.
You need to consider several factors before selecting which pocket filter to use.
Turbomachineryis a core component of most of the machines available.
You will find them in power generation, in marine, and automobiles.
Turbo machinery workshop
However, at the core of their functioning, are the pocket filters.
These pocket filters play an essential role in ensuring that the fluid that the turbos use is clean.
For instance, in power generation, they are used to filter the air which aids the rotation of the rotor blades.
Without the pocket filters, power generation would not be that efficient since the accumulation of particles in these blades would make it impossible to generate power.
In the automobile industry, they ensure efficient filtration of the air which powers the vehicles.
This provides cleaner air thus powering up the vehicle.
· Pharmaceutical industry
There is a vast area of the pharmaceutical industry that utilizes pocket filters in their operations.
For instance, you will find these filters useful in the filtration of gelatin, activated carbon, and in plasma protein filtration.
It is also common in the filtration liquid medicine especially those that used by little children.
The filtration of wastewater is also a common application where you can find pocket filters.
Here, they remove all the contaminants irrespective of their sizes which makes the water fit for reuse.
Lastly, you will find pocket filters in the filtration of a catalytic agent an in the recycling of different materials.
· Dust removal
A common application of pocket filter is in dust removal.
These filters assist in removing dust from a different application which would have otherwise been hard to operate.
Dust removal system
Alternatively, using these filters minimizes dust levels from flowing into your application.
These reduce dust from accumulating in your property which in turn ensures cleanliness.
The advantage here is that pocket filters come in different sizes from which you can select the one that fits your room.
There you go.
You are now an expert in pocket filters.
Remember, you need to pay attention to all the technical specifications for you to select a quality filter.
This, of course, will depend on the application that you are going to use your pocket filter.
Also, since there are different designs in the market, you need to check if the design of the pocket filter fits your application.
A reliable pocket filter manufacturer can be of help when it comes to getting quality pocket filters.
Get in touch with us today for quality and reliable pocket filters.