The Clampless filter bag is a dust bag most commonly used in industrial extractor systems. The Clampless Bag comes in a variety of lengths and the metal ring in the cuff comes in different sizes to fit a variety of cell plate diameters.  As a standard we make the bag with a separate cuff.

The units to which these bags fit operate by taking in dirty air through an inlet and as the air rises through the unit the dust forms a cake on the outside of the bag. The bag will then be cleaned via pulse jet cleaning this is when a blast of air inside the bag dislodges the ‘cake’ of dust. The dust then collects in a hopper and can be removed from the bottom of the unit.

The bag is fitted above in the walk-in clean air plenum so engineers avoid having to enter the area where dust is collected. This also means that engineers are fitting the bags at the level of there feet which can make fitting more difficult.

Below are some of the most common industries that these bags are used in;

• Air Pollution Control
• Pharmaceutical’s
• Manufacturing of Tobacco.
• Food Production.
• Production of Concrete.

How does the product fit?

The bag is first fitted onto  small flange in the cell plate; the cage goes in after the bag and has a flat edge around it to catch on the flange. A seal is formed from a spigot/venturi twisting into the cell plate holding everything in place. The bag should be tight to the cage as any bagginess can reduce the effectiveness of cleaning. It is important that the bag has no crease as creases on the cage can lead to leakage in the bag. The Bag should be the length of the cage with no excess as excess can lead to a lot of movement at the bottom of the cage this can reduce the overall effectiveness of the pulse jet cleaning as energy is being absorbed. It also means that the bag will move more and therefore will wear much faster.  The bag should be tight to the cage so there is a small pulse, which removes dust from the bag. In some case the fitters can put a sealing ring in the spigot to aid the seal.

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The post Polymers and Your Process appeared first on DRM Filtration | Filter Socks & Filter Bag Manufacturer.

Filter bags are one of the most important components of your dust collection unit. They are also often the most underrated by our customers. Choosing the correct filter media for your dust extraction bags is critical as it impacts on process and down time. DRM’s team can guide you through the selection process that can be split into 3 steps:

Step 1: Process environment

Choosing the right polymer for the dust extraction bags is the first step. The polymer has to be able to withstand your process environment before you can think about dust extraction. DRM offer felt in a wide range of polymers, from standard polyester to PTFE, Meta Aramid or PPS. Our team are able to advise on the polymer suitable for your dust extraction unit.

Step 2: Dust cake formation

The needle felt doesn’t filter on its own. The whole process of dust extraction relies on the formation of a dust cake. The needle felt provides a surface that allows for dust particles to accumulate and supports the dust cake. The cake acts as a filter to provide a high filtering efficiency during the unit’s operation. Having chosen the polymer for your dust extraction bags in Step 1, the technical team at DRM will next advise you on different available weights, micron ratings and finishes based on your dust to ensure good cake formation.

Step 3: Dust cake release

Once the filter efficiency/pressure drop is no longer in the right balance, the dust cake needs to be removed. The unit shakes or blows the dust off the dust extraction bags and the more efficiently this is done, the longer the dust extraction bags will last. Excessive dust build up can be caused by problems with the cleaning system or moisture in the dust collector. If your dust hardens on the bags and is not easily dislodged when the bag is shaken, moisture may be a problem in your unit. Moisture can form on the dust extraction bags from crossing of the dew point, high moisture content in the inlet stream, use of compressed air or leaks in the process equipment.

In this third step, DRM will optimise the media selection to work in your specific environment for maximum dust extraction bag life and process performance. Filter media come with a variety of finishes and treatments to aid cake release and to protect the dust extraction bags from blinding through excessive dust cake build up.  Our full selection of finishes is detailed in the table below:

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