Category Archive: Filter Bags & Parts

Shaker Filter Bags

How Shaker Filter Bags Collect Dust

Shaker baghouses collect dust similar to reverse air baghouses. Dust collects on the inside surface of the shaker filter bags, and then clean air exits through the top of the bag. The main difference is how the bags cleaned.

How to Clean Shaker Filter Bags

Shaker baghouses are engineered so that filters are hung and tensioned from the top of the unit, and at the bottom they are attached to a tube sheet. Mechanically shaking the filter bags is what cleans them. Shaker baghouses only clean while the system is off-line. Shaker baghouse operation is simple and can be seen in applications where no compressed air is available.

Construction of Shaker Filter Bags

Fabric filter bags used in shaker baghouses are typically constructed with woven or light weight media options like polyester sateen, shaker felt, beane knit, and more. Treatments are dependent on a plant’s application and dust characteristics. The most common top and bottom configurations for shaker baghouses are below.

Most Common Top & Bottom Construction for a Shaker Baghouse

Top Load Baghouse: Grommet Top, Loop Top, Strap Top
Bottom Load Baghouse: Corded Cuff Bottom, Double Beaded Snap Band

If you would like to get a free media recommendation, check out our filter bag media quiz here. There is also a fabric characteristics sheet that you can download below. It takes a closer look at the most common filter bag medias used in the dust collection industry.

Dust Collector Filter Bags

Filter Bag Resources

To learn more about how to select the right filter bags, you can download our filter bag guide with the link below. The guide provides resources on key topics such as; dust properties, filter media, finishes and treatments, construction, and air-to-cloth ratio.

Looking to start with the basics? Watch this “Guide to Filter Media” video to learn more about the most common medias used in the industrial dust collection industry.

Guide to Filter Media

Are ready to get a set of filters? Check out our online product catalog below. You can also request a quote within 24 hours, call at 888-221-0132, or simply email [email protected]

Filter Bag Request a Quote

 

 

Baghouse Filter Bag Top and Bottom Configurations

Filter bag configurations can vary from one dust collector to another. Baghouse filter top and bottom configurations will be dependent on the type of baghouse dust collector you have. The most common types of baghouses are pulse-jet and plenum pulse, reverse air, and shaker.

Dust Collector

Pulse-Jet and Plenum Pulse Baghouse

Pulse-jet and Plenum Pulse baghouses collect dust on the outside of the filter. Dust-laden gas floods the dust collector, and clean air exits through the inside of the bag while dust particles collect on the outside filter surface. A pulse-jet is one of the most common styles of baghouses will see across a variety of industries and applications. The most common types of filter top and bottom configurations in this style of baghouse are:

Top Load Baghouse Filter: Double Beaded Snap Band Top, Disc Bottom
Bottom Load Baghouse Filter: Raw Top, Disc Bottom

Reverse Air Baghouse

In reverse air baghouses dust will collect on the inside surface of the filter. Air enters the dirty side (inlet) of the baghouse and flows upwards through the bag. The bag filters and collects the dust on the inside, then clean air exits through the top of the bag. Reverse air baghouses are typically seen in large air handling applications like energy.

Top Configuration: Compression Band with Cap & Hook
Bottom Configuration: Compression Band, Corded, Double Beaded Snap Band

Shaker Baghouse

The way shaker baghouses collect dust is similar to reverse air baghouses. Dust is collected on the inside of surface of the filter. Dust particulate is filtered and collected on the inside of the filter, then clean air exits through the top of the bag. The difference in this system is in how the bags are cleaned. Filter bags are hung and tensioned from the top of the unit, and at the bottom they are attached to a tube sheet. As the name suggests, you clean the bags by mechanically shaking them. Shaker baghouses are generally simple, and can be seen in applications where there is no compressed air available.

Top Configuration: Grommet Top, Loop Top, Strap Top
Bottom Configuration: Corded Cuff Bottom, Double Beaded Snap Band

Filter bag construction and dimensions vary between industries, applications, dust collector types and manufacturers. Here are some of the filter bag top and bottom configurations you may come across.

Top and Bottom Construction Filter Bag Configurations

Most Common Baghouse Filter Configurations:

  • Double Beaded Snap Band
  • Disc (with or without wear cuff)
  • Sewn Flat
  • Open Hemmed
  • Raw Edge

Least Common Baghouse Filter Configurations

  • Disc with zipper
  • Spout
  • A-hanger
  • Flange
  • Belt Loops
  • O-Ring

Other Baghouse Filter Configurations

  • Envelope
  • Grommet
  • Strap
  • Loop
  • Snap Ring
  • Corded
  • Double Disc
  • Compression with Cap and Hook

Baghouse Filter Resources

To learn more about how to select the right filter bags , you can download our filter bag eBook with the link below. The ebook provides resources on key topics such as; dust properties, filter media, finishes and treatments, construction, and air-to-cloth ratio.

Filter Bag eBook

Video: Guide to Filter Media

Guide to Filter Media

Find Your Baghouse Filter

Are you ready to find your filter? If you are looking for a quote, click on the link below to submit your information. We’ll get a quote back to you within 24 hours.

Request A Quote: Filter Bags

How to Replace Your Dust Collector Diaphragm Valve

Is your dust collector showing signs of trouble? It could be your diaphragm valve.

As your dust collector goes through it’s life cycle, your parts start to wear out. Diaphragms are one of the 5 most commonly replaced dust collector parts. These are the common warning signs of trouble and how you can replace a diaphragm valve.

Common Symptoms of a Worn Out Diaphragm Valve

  • Rubber has crack or holes in it
  • Diaphragm kit is pitted, allowing air to leak through
  • Any holes tears or imperfections indicate it’s time to change it out
  • Is your spring broken? It’s time to replace your diaphragm valve.

Once you’ve diagnosed your issue, you’ll need to fix it. Below is a short video guide that provides step-by-step instructions on how to replace a diaphragm valve.

Replace a Diaphragm Valve Video Transcript:

Hi, this is Bob with US air filtration. And today I’m going to show you how to change out the diaphragm inside a solenoid pulse valve.

Pulse Valve Types

As you can see here pulse valves come in a lot of different sizes and shapes. Some valves have coils on the top, and some don’t. Pulse valves can have two diaphragms or one. Others have couplings, threads, or flange connectors. But the process of changing out the diaphragm is really very similar in all of them.

First Steps to Replacing a Diaphragm Valve

I’m going to show you today, on this particular valve, how to change out the diaphragm.

First thing that we’re going to do is remove the bolts that are holding on the top of the belt. I’m using a socket set and I’m going to loosen these up. Once I get all the valves loose I can pull off the top.

I’ll tell you, sometimes when these valves have been sitting, especially out in the sun for a while getting this top piece off isn’t really easy. You may need to take a screwdriver and a hammer and just tap it lightly there where the rubber is to help get the top off.

But once you get the top off you can remove the spring and you can peel off the diaphragm.

Diaphragm Valve Bleed Hole / Pin

Now in some pulse valves, well in all pulse valves, there’s a little bleed hole. And often times, there’s a pin this particular one, has a little pin right here that this allows the air pressure to equalize between the two halves of the valve.

It’s really important that we don’t block this hole or damage this pin when we put the valve back together.

New Diaphragm

Once we pull off the old diaphragm kit, we can grab the new diaphragm. And the first thing we want to do is find out where that bleed hole is in the diaphragm. Here, it’s this hole right here. We’re gonna place that right over the pin.

The teflon disc or it’s a rubber disc on your diaphragm goes down so that it seats up against this part of the valve. It’s not a bad idea to look and make sure that there’s no damage to the the body of the valve.

Typically though these aluminum bodies; it’s really hard to damage them. I don’t usually see problems with them. It’s usually the diaphragms that go.

We’re gonna line up the hole with the bleed hole. And make sure our holes line up and put our diaphragm back then.

Then we need to make sure that we have the spring that comes with the repair kit that goes back on top of the diaphragm and then we’re gonna put the top back on.

Now just like I mentioned, with this bleed hole, there’s a place where the bleed hole on this top cover goes. We need to make sure we’ve lined that bleed hole up with the bleed hole here.

If we block it, the valve is not gonna work. Or if you don’t put it on correctly, and there’s a pin, you’ll squash the pin. And then you’re gonna have to buy a new valve just to replace this little pin.

We’re gonna line this up. And I can kind of feel it set on the right. And then we’re just going to tighten down all the bolts.

Tighten Bolts

Now once I get everything finger tightened I want to go ahead and tighten these bolts down.

If I don’t tighten the bolts down properly, and you don’t get this clamping this diaphragm together, you’re gonna get a leak outside of the valve.

The best practice is, with your ratchet, is to tighten the bolt on one side and then go to the opposite side and tighten it down. And then just keep going about 180 degrees so that your getting a nice even pressure.

Upper Smaller Diaphragm

Okay now we need to do the little diaphragm.

I’m gonna pull off this coil, which I could have done before. And actually if you have electrical wires connected to this, it helps to pull off the coil.

I might add too, before you start this you need to turn off the compressed air to your valve. Or as soon as you start releasing this, it’ll just start blowing everywhere

Okay. So to change out this upper smaller diaphragm we need to loosen up these four bolts here with an allen wrench.

I’m going to loosen all of these up and then remove these bolts.

Okay once all the bolts are loose, you can lift off the top. Once again, there’s a spring and the diaphragm. You’ll grab the new diaphragm with the little metal side down.

Again there’s a little tiny pin right there for the bleed hole. Every diaphragm is gonna have a bleed hole somewhere that you need to make sure you line up.

There are a few types of valves that the bleed hole is actually in the body of the diaphragm.

In those cases you don’t have to worry about it too much. But a lot of valves have these pins.

So, I’m gonna line this bleed hole up and put it on. And take the new spring and put it on. And then I’m going to make sure that my hole right under here, where the bleed hole goes, is gonna go right over that bleed hole.

I can feel it seat down on there. And again I’m gonna tighten the bolts.

Everything’s good and tight. Put our coil back on.

And now we’re ready to turn the compressed air back on, and test our valve to make sure it all works.

 

Related Resources:

Dust Collector Change Out Check List

Benefits of PTFE Membrane

Are you spending too much time and money on costly change-outs?

Would you like save yourself from the headaches that come with change-outs? Then PTFE may be the answer to your problem. Our brief video guide will provide some information on how PTFE membrane works and its benefits when its added to your filter media.

Video Transcript

Hi this is Bob from US Air Filtration.

  • Do you want to get twice the life out of your filter bags and reduce costly change-outs?
  • What if your dust collection system captured more dust?
  • Would you like to get consistent airflow or suction through your dust collection system while reducing wear and tear and reducing maintenance costs?

If the answer to any of these questions is yes, then PTFE membrane filter bags may be the answer. For you to understand how PTFE membrane bags can accomplish these things let’s first look at how a standard filter bag works.

How a Standard Filter Bag Works

On a standard bag dust builds up on the outside of the bag and creates what is known as the filter cake. The filter cake actually does the filtering while the bag fabric acts only as a support for the cake. When the bags are pulsed most of the filter cake releases and the build-up of dust begins again.

Over time however, some of the dust gets embedded deep into the bag fibers. Eventually, the bags will completely plug and need to be replaced.

Conversely, when PTFE is added to the bag it acts as the filter cake. Commonly known as Teflon. PTFE is used in many different applications from cookware to outerwear and more. When a PTFE membrane is laminated to a filter bag media it can enhance the performance of both the filter bag and the dust collection system.

How PTFE Membrane Works

Let’s take a closer look at how a PTFE membrane works. If we zoom in on the PTFE membrane we can see that it is actually made out of tiny microscopic holes like Swiss cheese. The holes are large enough to allow air molecules and vapors to pass through but small enough to inhibit even the smallest dust particles from getting through.

Because the membrane keeps the dust on the surface of the bag particles never get embedded in the bag fibers and the bags will not fail from plugging up. Typically PTFE membrane bags wear out before they plug up. Usually lasting twice as long as standard bag.

Benefits of PTFE Membrane

With twice the lifespan costly change-outs and plant shutdowns are cut in half reducing maintenance costs and increasing plant production. Since the bags are not gradually plugging up over time, PTFE bags give the additional benefit of providing more consistent airflow or suction from your dust collection system.

Because of the small pore size, PTFE membrane bags are up to eight times more efficient than a standard filter bag. This means it can cut out dust collector emissions by up to 800 percent.

Additional Advantages of PTFE Membrane

Another advantage of PTFE membrane bags is that they clean easier because of their slick surface. This means less bag pulsing. Which also means less wear and tear on the bags as well as the diaphragms and solenoid valves. It also means the system uses less compressed air resulting in reduced energy costs.

It can also improve performance when higher moisture levels or sticky dust are present. PTFE membrane can be added to any bag media and can replace standard bags and almost all applications. While there is a cost to add the membrane, the extra cost easily pays for itself. It provides longer life, reduced maintenance cost, reduced wear and tear, and lower emissions.

To find out if PTFE membrane filter bags are right for you call and talk to one of our experts today.

Related Resources:

Filter Bag Construction

Dust Collector Change Out Check List

How do you know when it’s time for a dust collector change out?

There are typically two reasons people have a dust collector change out.

  1. The build-up of filter cake is so excessive that it is blinding your filters.
  2. You have a hole/leak in your filter(s).

Your dust collector is a major investment. Maintaining your system’s vital components is going to play a critical role in keeping your production down time and maintenance costs to a minimum. To help you determine if your filters are compromised and it’s time for a dust collector change out, check out our brief video below.

Are you ready to change out your dust collector? Download this check list below.

Check out our full checklist here.

Dust Collector Change Out Video Transcript:

Factors that Influence Filter Life

Hi, I’m Bob from U.S. Air Filtration. Today, I would like to answer a common question that we are often asked. That is, “When is it time to change my filters?”

There are several key indicators and considerations that will help you determine the answer to this question.

Before we discuss these, let’s review the two main reasons for changing filters. One, either the filter fabric has become compromised by a hole or tear in the fabric which now allows dust to pass through. Or two, the filter fabric has become fully entrained or clogged with dust particles which permanently restrict air flow through the filters.

Dust Collector Change Out Indicators

Ok, Let’s talk about the indicators:

This may seem obvious, but the first indicator is if you see dust coming out of the clean side of the collector. This means you likely have either a hole in the filter or the filter’s seal has been compromised.

You can find bad filters by conducting a visual inspection. Sometimes the holes may be very small or hard to find. In these situations, you can find the leak by conducting a leak test.

This is accomplished by introducing leak powder into the system. The powder will concentrate around any leaks and become visible under a black light. Call us to learn more how this product works.

Differential Pressure

While damaged filters with holes or a poor seal will leak dust, clogged filters do not leak dust. Instead the dust becomes embedded into the fibers of the filter. This increases the resistance of the air flow, which increases the differential pressure reading on your dust collector.

Differential Pressure is the difference in air pressure between the clean and dirty sides of a collector.

A consistently higher differential pressure indicates that it is more difficult for the air to get through the filter media and usually means filters are nearing the end of their life span.

When you consistently see Differential pressure readings of 6 or above and they don’t drop significantly during the collectors cleaning cycle, it’s generally a sign that it’s time to change your filters.

Loss of Suction at Pick Up Points

Another indicator that points toward a filter change-out is when your pick up points are not getting the suction you’re used to seeing. It is the permanently entrained dust that causes the reduced air flow, and as we mentioned, the higher differential pressure.

Dust Collector Change Out General Rules

Let’s discuss a few other considerations.

As a general rule, it is better to change out all the filters in a collector than a few at a time. Air flow always follows the path of least resistance, and you can quickly wear out new filters if they are doing all the work in your collector.

Some of our clients like to change out filters during scheduled plant shut downs or on a maintenance schedule.

Filters may have some life left, but this is a good option if the risk of having a problem before a scheduled shut down is too great, or the predictability of filter life is fairly certain.

Laboratory Tests

One final thing to consider is using a laboratory test to determine how much life remains in a set a filters. This testing is not common and is typically only when the bag cost is substantial and there is a lack of history with the bag life or there is some other unique problem that can’t be otherwise solved. In most cases, the other mentioned indicators are sufficient to determine when to change out your filters.

How Long Filters Last

Another question we are often asked is how long do filters typically last.

This is a really tough question to answer because there are so many environmental factors that come in to play. We have seen filters last anywhere from a few weeks up to 5 years or more. On average, life expectancy is about a year, but it really varies.

Here is a list of some of the factors that influence filter life. To find out more about these factors or to ask one of our experts if it’s the right time for a dust collector change out, give us a call.

  1. Air to cloth ratio
  2. Volume of dust loading
  3. Size of dust
  4. Presence of membranes or coatings
  5. Dust characteristics (powdery, sticky, shape)
  6. Air velocity through the filters
  7. Moisture in the dust
  8. Ambient air moisture
  9. Cleanliness of compressed air
  10. Presence of chemicals – oils, acids, etc.
  11. Operating temperature
  12. Frequency of cleaning cycle
  13. Average differential pressure
  14. Proper cage fit
  15. Proper installation

Pulse-Jet Filter Bags

Introduction to Pulse-Jet Filter Bags

How Pulse-Jet Filter Bags Collect Dust

Pulse-jet filter bags are used to remove dust particulate and contaminants from the air in warehouses, plants, factories, foundries, and more. Pulse-jet is one of the most common styles of baghouses you will see across a variety of industries and applications. With this style of baghouse, dust collects on the outside of the filter as clean air exits through the inside of the bag.

How Pulse-Jet Filter Bags are Cleaned

To clean pulse-jet baghouse filters, a blast of compressed air is injected through a blowpipe over each row of bags via a venturi. In a pulse-jet baghouse one row of bags can be cleaned while the remaining rows continue to collect dust particulate. This is known as on-line cleaning.

Construction of Pulse-Jet Filter Bags

Pulse-Jet baghouses are engineered to hold either bottom or top load filter bags and cages. Fabric filter bags used in pulse-jet and plenum pulse baghouses come in a variety of medias and treatments. The type of filter media and treatment that’s best will be dependent on a plant’s application and dust characteristics. To get a free filter recommendation, check out our filter bag media quiz here. You can also download our fabric characteristics sheet to get a closer look at the most common filter bag medias used in the dust collection industry.

Dust Collector Filter Bags

Most Common Top & Bottom Construction for a Pulse-Jet Baghouse

Top Load Baghouse: Double Beaded Snap Band Top, Disc Bottom
Bottom Load Baghouse: Raw Top, Disc Bottom

Filter Bag Resources

To learn more about how to select the right filter bags, you can download our filter bag guide with the link below. The guide provides resources on key topics such as; dust properties, filter media, finishes and treatments, construction, and air-to-cloth ratio.

Filter Bag Guide

Video: Guide to Filter Media

Guide to Filter Media

If you are ready to get a set of filters you can check out our online product catalog, request a quote within 24 hours, call at 888-221-0132, or simply email [email protected]

Filter Bag Request a Quote

 

Guide to High Temperature Dust Collector Filter Bags

High Temperature Filter Bags

Is your application operating at a high temperature over 275 degrees Fahrenheit? If so, there are many dust collector filter bag options to choose from. Outlined below is your guide to high temperature dust collector filter bags. We’ve broken down characteristics and properties of the top five most common filter media options.

Aramid

Aramid filter media, otherwise known by the brand name Nomex©, can handle up to a maximum continuous operating temperature of 400 degrees Fahrenheit. The main advantage of Aramid is how well Aramid can withstand high heat. In fact, Aramid media is commonly used in household oven mittens. Aramid is not ideal for applications looking for acid resistance.

Aramid filter media is commonly used in asphalt plants and rock plants where there is high heat but are no chemical issues. You can typically distinguish an Aramid filter bag by its color. It is usually yellow and can have brown speckles which is caused by singeing.

Aramid (Nomex) Filter Bag Media

CharacteristicsRating
Relative Cost$$$
Max Continuous Operating Temperature400 Degrees F.
AbrasionGood
Energy AbsorpsionGood
Filtration PropertiesExcellent
Moist HeatGood
AlkalineGood
Mineral AcidsFair
Oxygen (15%+)Excellent

ProsCons
Provides great resistance to highly abrasive dust applications.Mineral oxides can cause deterioration or partial decomposition over time.

Applications
Cement
Cupolas
High Temp Dryers

Fiberglass

Fiberglass filter media has been the leading industry standard for dust collection applications where high temperatures above 500 degrees Fahrenheit are present. Fiberglass filter media is composed of a dense structure of fine fiberglass filaments. You’ll see Fiberglass used in industries such as energy, chemicals, and minerals.

It is cost efficient when compared to similar high heat filter medias and is the most common choice for situations where heat is above 400 degrees Fahrenheit. Fiberglass can have a lot of variation in color, and depending on the application, can have different types of treatment (i.e. silicon, carbon).

Fiberglass Filter Bag Media

CharacteristicRating
Relative Cost$$$$
Max Continuous Operating Temperature500 Degrees F.
AbrasionFair
Energy AbsorptionFair
Filtration PropertiesFair
Moist HeatExcellent
AlkalineFair
Mineral AcidsPoor
Oxygen (15%+)Excellent

ProsCons
Performs excellent in high temperature applications up to 500 Degrees Fahrenheit.Sensitive bag to cage fit. Has poor flex abrasion qualities and would require a cage with 20 vertical wires for minimum support.

Applications
Power Plants
Cement Kilns
Carbon Black Reactors

PPS

PPS, also otherwise known by the proprietary name Ryton© or Procon© is commonly used in dust collection applications that require excellent resistance to acids and alkaline. Out of all the options for high temperature filter medias, PPS has the lowest tolerance to heat in comparison with others but handles chemicals better. PPS can be used in applications with maximum continuous operating temperatures of 375 degrees Fahrenheit. PPS filter bag media is commonly used in carbon black, chemicals, cement, asphalt, coal fired boilers, and incinerator applications.

PPS (Ryton©/Procon©) Filter Bag Media

CharacteristicRating
Relative Cost$$$$$
Max Continuous Operating Temperature375 Degrees F.
AbrasionGood
Energy AbsorptionGood
Filtration PropertiesGood
Moist HeatGood
AlkalineExcellent
Mineral AcidsExcellent
Oxygen (15%+)Poor

ProsCons
Excellent resistance to acids and alkaline Sensitive bag to cage fit.

Applications
Asphalt Plants
Cement Mills
Incinerators

P84

P84 (polymide) dust collector filter media is used in operating conditions of a maximum 500 degrees Fahrenheit. P84 performs well under dry high heat temperatures and can even withstand some elevated levels of moisture. P84 has a slightly better resistance to acids than PPS. This is a proprietary fabric that is imported from Germany to all manufacturers. For these reasons, P84 is one of the more expensive filter medias used in pulse jet baghouse dust collectors. P84 filter can be seen in used in waste to energy, power, lime kilns, smelting, glass and ceramic, and cement applications.

P84 Filter Bag Media

CharacteristicRating
Relative Cost$$$$$$
Max Continuous Operating Temperature500 Degrees F.
AbrasionFair
Energy AbsorptionGood
Filtration PropertiesExcellent
Moist HeatGood
AlkalineFair
Mineral AcidsGood
Oxygen (15%+)Excellent

ProsCons
Excellent stability in applications with high dry heat temperatures, mineral acids, and alkaline.Must oversize bag for shrinkage that can occur in temperatures above 450 Degrees F.

Applications
Waste-to-Energy
Coal Fired Boilers
Incinerators

PTFE

PTFE, otherwise known as Teflon, is one of the most expensive dust collector filter medias used in pulse jet baghouse dust collectors. PTFE is considered a premium filter media because it can deliver superior dust cake release, withstand high heat temperatures of up to 500 degrees Fahrenheit, resist acids and moist heat. Cement, steel foundries, coal fired power plants, carbon black, steel and energy applications are just a few example of industries that use PTFE. PTFE is alfso known by its proprietary names Gore-Tex© and Tetratex©.

Teflon Filter Bag Media

CharacteristicRating
Relative Cost$$$$$$$
Max Continuous Operating Temperature500 Degrees F.
AbrasionGood
Energy AbsorptionGood
Filtration PropertiesFair
Moist HeatExcellent
AlkalineExcellent
Mineral AcidsExcellent
Oxygen (15%+)Excellent

ProsCons
Teflon delivers superior dust cake release and high filtration efficiency in high heat applications that demand high resistance to acids and moist heat. Must oversize bag for shrinkage that can occur in temperatures above 450 Degrees F.

Applications
Steel Foundries
Coal Fired Power Plants
Carbon Black Plants

Do you need more information after reading this guide to high temperature dust collector filter bags? If you need help, one of our account managers can help find the right fit for you. Contact us at 888-221-0312, email [email protected] or request a consultation here.

Filter Bag Request a Quote

Dust Collector Filter Bag Resources

In search of additional dust collection resources to help you? Get a free download of our How to Select the Right Filter Bag eBook below. It’s a full guide organized into key topics such as dust properties, filter bag finishes, air to cloth ratio, filter bag construction, and more.

Polyester vs Polypropylene Filter Bags

Polyester vs Polypropylene Industry Use

Today we are exploring the differences between Polyester vs Polypropylene filter bags. Polyester is one of the most widely used filter bag medias in the dust collection industry because of its reliable performance in a broad range of applications, relatively low cost, and availability. Many industries including food manufacturing, woodworking, metalworking, building products, and energy have used polyester filter bags to achieve peak dust collection performance. If you continuously operate between temperatures of ambient – 275 degrees Fahrenheit and you have less than 10% moisture in your application, then polyester may be the right fit for your application.

Polypropylene is also another relatively low-cost filter bag media. The main difference between polyester and polypropylene is how well polypropylene can withstand moisture. If your continuous operating temperatures are between ambient – 170 degrees Fahrenheit, and you have more than 10% moisture in your application, then Polypropylene could be the right fit for your baghouse.

To find out which media is the right fit for your specific application you can take our filter bag media quiz that will provide an instant recommendation based on your application.

Polyester vs Polypropylene Filter Bag Treatments and Finishes

Depending on your specific needs an additional filter bag treatment or finish could be lengthen the life of your filter bags.

Polyester Filter Bag Finishes & Treatments

  • PTFE Membrane – Can double the life of a standard filter bag, reduce wear and tear, reduce maintenance costs, reduce energy costs, and more.
  • Hydro-oleophobic coating – Aids in filtration and adds resistance to water and oils.
  • Acrylic – Can help improve cake release and filtration efficiency in certain applications.
  • Anti-static – Helps ground the filter bag.
  • Singed – Removes straggly fibers which provides a uniform surface area and improved dust cake release.
  • Glazed – Improved mechanical stability since fibers are fused to the body of the filter medium.
  • Calendered – Flattens and smooths the filter medium. This can increase surface life, dimensional stability, and provides a more uniform fabric surface.

Polyester Filter Bag Media

CharacteristicRating
Relative Cost$
Max Continuous Operating Temperature275 Degrees F.
AbrasionExcellent
Energy AbsorptionExcellent
Filtration PropertiesExcellent
Moist HeatPoor
AlkalineFair
Mineral AcidsFair
Oxygen (15%+)Excellent

Polypropylene Filter Bag Finishes & Treatments

  • PTFE Membrane
  • Singed
  • Glazed

Polypropylene Filter Bag Media

CharacteristicRating
Relative Cost$
Max Continuous Operating Temperature170 Degrees F.
AbrasionExcellent
Energy AbsorptionGood
Filtration PropertiesGood
Moist HeatExcellent
AlkalineExcellent
Mineral AcidsExcellent
Oxygen (15%+)Excellent

Dust Collector Filter Bag Resources

If you’re looking for additional filter bag resources such as construction, air-to-cloth ratio or dust properties you can download our filter bag eBook below. You can also access our filter bag characteristics chart below.

Ready to find your filter and need a quote within 24 hours? Simply follow the link below and we’ll help with your filter bag request.

Industrial Dust Collector Filter Bags

Table of Contents

  • Key components to choosing the right filter bag media for your Dust Collector
  • How air to cloth ratio affects the performance of your filter bags
  • The ideal filter bag construction
  • Filter Bag treatments to extend bag life
  • Cage construction for your filter bag
  • Optimize dust collector performance with a maintenance plan

 

Industrial dust collector filter bags are used in multiple styles of industrial dust collection systems that range from pulse-jet, plenum-pulse, reverse air, and shaker baghouses. Filter bags aid in collecting dust particulate which helps to improve air quality, eliminate potential fire hazards, and keep dust from negatively affecting the product quality.

Filter bags are used in industries such as woodworking, cement, chemicals, construction, mining & minerals, agriculture, metalworking and much more.

Key Components to Choosing the Right Filter Bag Media for your Dust Collector

Watch Video: Understanding Dust Properties

Understanding Dust Properties

Understanding the properties of your dust particulate is a key component to choosing the right filter bag media. The right media allows you to get the best performance and longevity out of your dust collector filters. Consider the following properties and how they play a role in your filter media choice:

Product

What you are filtering? Does your application contain moisture or oil? Products that contain oils and hydrocarbons may need additional filter bag treatment.

Particles

What the size of the dust you are filtering?

Temperature

What is your operating temperature? What is your max temperature? If you are operating at a high temperature, you will need specific filter bag media or a special treatment to withstand the heat. Temperature ranges for dry dust collection can be typically sorted into the following categories:

                    -Ambient – 265 Deg F

                    -275-375 Deg F

                    -400-500 Deg F

Chemistry

Does your application contain dust particles that have a chemical make-up? If so, you may require a media treatment or coating that will prevent your filter bags from accelerated wear.

Abrasion/Resistance

How abrasive is your dust? Consider the hardness of the material that is being filtered along with the shape. If it is abrasive, you will need a filter bag media with the ability to resist the additional wear and tear.

Combustible Dust

Is your dust combustible? The most combustible types of dust are dust from wood, sugar, or fine aluminum but there is a wide range of industries that operate with combustible dust.

For help finding the right filter media for your application, try our filter media quiz to get your recommended filter media.

How Air to Cloth Ratio Affects the Performance of your Filter Bags

Air-to-Cloth ratio is a measurement of the amount of air passing through one square foot of filter media. Calculating the right air-to-cloth ratio allows your dust collector system to run at peak performance, it extends filter life, minimizes operating costs, and helps you to meet air quality goals. When calculating air-to-cloth ratio for your dust collection system, keep in mind that generally the lower your air-to-cloth ratio, the more effective your system is at removing dust from the work environment. Increased differential pressure, frequent change outs, and reduced airflow due to a buildup of dust cake are just come of commonly experienced problems with a higher air-to-cloth ratio.

Air-to-Cloth Ratio

Watch Video: Air-to-Cloth Ratio

Air to Cloth Ratio

The Ideal Filter Bag Construction

There are a few commonly used industrial dust collector filter bag medias used with industrial dust collectors. Polyester, Aramid, Fiberglass, P84, and PTFE are all common options that are available at different price points and have varying characteristics such as maximum operating temperature, resistance to chemicals and acids, ability to withstand abrasion and more.

Dust Collector Filter Bags

Top 3 Common Filter Bag Medias

Watch Video: Guide to Filter Media

Guide to Filter Media

Polyester

Polyester is widely available at a relatively low cost. Polyester filter bag media offers great dimensional stability and has good overall qualities to resist abrasion while performing well with dry temperatures. It’s used in woodworking, manufacturing, food processing and more.

Aramid

Aramid, also known as Nomex©, is widely used in high temperature applications with a continuous operating temperature of 400 degrees Fahrenheit. Aramid filter media is frequently used in industries such as cement, foundries, and metalworking and castings.

Fiberglass

Fiberglass filter media is a leading industry standard for applications where continuous operating temperatures of 500 degrees Fahrenheit are prevalent. It’s most commonly used in industries such as chemicals, minerals, and energy pipeline and utilities.

When it comes to filter bag construction there are a wide variety of configurations. The simplest way to understand the top and bottom construction needed for your filter bag will be knowing the type of dust collector system you have. There are three common types of baghouses; pulse-jet and plenum pulse, reverse air, and shaker.

Pulse-jet and plenum pulse baghouses are the most widely used style of dust collector. They can be configured as either top load or bottom load. If your baghouse is top load the most common filter bag construction is a double beaded snap band top with a disc bottom. If you have a bottom load baghouse the most common construction is a raw top with disc bottom.

Reverse air baghouses are typically seen in large air handling applications. The most common filter bag configuration is a compression band with cap and hook for the top. For bottom configuration you will typically see either a compression band, corded, or double beaded snap band.

Shaker baghouses are generally simple and can be seen in applications where there is no compressed air available. In shaker baghouses the filter bags are hung and tensioned from the top of the unit, and at the bottom they are attached to a tube sheet. The most common top configurations are grommet top, loop top and strap top. Bottom configurations can range from corded cuff or a double beaded snap band.

How to Measure Filter Bags Video

To measure a bag, you need to get three critical dimensions. The first dimensions that we need to know is the snap band size. This is actually the hole size in your baghouse that the bag snaps into. We also need to know the bag body diameter. Which is the diameter of the bag, at the midsection of the bag. And we need to know the overall length.

How to Install a Snap Band Filter

 

Filter Bag Treatments to Extend Bag Life

Applying a specific finish or treatment is one way you can lengthen the life of your filter bags and achieve better performance. Whether your filter bag media is constructed of synthetic or natural fabrics, treatments such as  calendering (glazing), napping, singeing, or coating are available.

Benefits of PTFE Membrane Video

PTFE Membrane

One specific filter bag treatment that stands out among the rest is commonly known as Teflon or PTFE. It’s used in many different applications but when specifically laminated to a filter bag media it can enhance the performance of both the filter bag and the dust collection system.

Calendering

This is also known as glazing and is done to increase and uniform surface life, improve stability and reduce shrinkage.

Napping

Fabrics used for collecting sticky or oily dusts are sometimes napped so they can provide better collection and an easier cleaning process.

Singeing

This removes any straggly surface fibers and results in a more uniform filter bag surface

Coating

This process helps lubricate the woven fibers, provides high-temperature durability, and various fabrics.

Cage Construction for Your Filter Bag

Industrial dust collector filter bags require internal support structures referred to as cages. Cages will provide the support needed for filter bags to stay open during the dust collection cycle. The construction of your cage will depend on the design of your baghouse; top or bottom load.

Optimize Dust Collector Performance with a Maintenance Plan

There is no disadvantage to being proactive and implementing a maintenance plan for your dust collection system. It helps detect any issues before they become a larger problem. Some of the benefits of a dust collection maintenance plan are long filter life, prevention of dust collection explosions, and reduced unplanned downtime throughout the year.

Watch Video: 5 Most Commonly Replaced Dust Collector Parts

5 Commonly Replaced Dust Collector Parts

How to Detect a Dust Collector Leak Video

Find the Right Solution for Your Application

If you would like additional help finding the right solution for your application, we can do that! You can contact one of our experienced account managers at 888-221-0312 or email [email protected] Already have information and just need a quote? You can also submit your specs here and get a quote in 24 hours!

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Filter Bag Media: P84

Industry Use

P84 (polymide) dust collector filter media displays excellent stability under dry high heat temperatures, has great filtration properties, and performs well even under elevated levels of moisture content. These are some of the reasons P84 is one of the more expensive filter medias used in pulse jet baghouse dust collectors. Industries that use P84 filter media range from waste to energy, power, and cement.

Dust Collection Characteristics

The stability of P84 filter media is a benefit to a wide variety of applications lime kilns, smelting, incinerators, coal fired boilers, and glass and ceramic industries. It can be utilized in operating conditions of a maximum 500 degrees Fahrenheit and offers a good resistance to mineral acids. If your baghouse is operating above 450 degrees Fahrenheit keep in mind that you may need to oversize the bag to account for the shrinkage that will occur at extreme temperatures. Media weight is typically available in 14, 16, and 18 ounces. Below are more of the characteristics of P84 filter media.

P84 Filter Bag Media

CharacteristicRating
Relative Cost$$$$$$
Max Continuous Operating Temperature500 Degrees F.
AbrasionFair
Energy AbsorptionGood
Filtration PropertiesExcellent
Moist HeatGood
AlkalineFair
Mineral AcidsGood
Oxygen (15%+)Excellent

ProsCons
Excellent stability in applications with high dry heat temperatures, mineral acids, and alkaline.Must oversize bag for shrinkage that can occur in temperatures above 450 Degrees F.

Applications
Waste-to-Energy
Coal Fired Boilers
Incinerators

Filter Bag Treatments & Finishes

PTFE Membrane
• Singe
• Glazed

Benefits of Treatments & Finishes

PTFE Membrane: Applying a PTFE membrane will allow you to lengthen the life of your bag since the membrane acts as the filter cake. It would allow for very little dust to stick to the bag itself. As the dust stays on the surface of the membrane and does not get entrained into the fibers of the bag, this allows your filter to last twice as long. Other benefits include reduced wear and tear, savings on maintenance costs, reduced energy costs, and more.

Singe: A pre-treatment process that is achieved by passing the filter material over an open flame, removing any straggly surface fibers. The result is a uniform surface area that improves cake release.

Glazed: A pre-treatment process achieved by a high pressure pressing of the fiber at elevated temperatures. The fibers are fused to the body of the filter medium that improves mechanical stability.

Filter Bag Resources

To learn more about filter media, treatments, configurations, and air-to-cloth ratio download our filter bag eBook below.

Find Your Filter Bag

Looking to find your filter? Simply follow the link below, submit your filter bag information, and get a quote within 24 hours.