Filter bags and pockets

The filter bags and pockets manufactured by ICT FILTRATION ensure no emissions of product, thanks to the use of the right materials for each application and the most advanced manufacturing technology.

ICT FILTRATION makes filters for the equipment of the main manufacturers of custom systems and products to meet each customer’s specific requirements, as it has the technological and production capacity to design and manufacture both standard and customised solutions.

ICT FILTRATION guarantees the life cycle and durability of its bags through the PRO-RATA TEMPORIS system.


  • Materials of different permeabilities and retention capacities.
  • Static (conductive) needlepunch in accordance with the ATEX standard.
  • Materials with EU10/2011 food certification.
  • Manufacturing to order.
  • Product customisation: individual packaging, references on labels or laser engraving.
  • High-quality finishes to prevent fibre separation.
  • A variety of finishes depending on environmental and process conditions.
  • Analysis of working conditions to ensure a longer working life for the product.
  • Quality, precision cutting with CAD laser technology.
  • Seams sealed by ultrasound and heat sealing.
  • Special fabrics for abrasive dusts with a low humidity content.
  • Optimum air flow to particle retention ratio.
  • ePTFE membrane.
  • GMP, FDA, ATEX, EU10 2011.

mangas filtrantes


To achieve maximum efficiency in filter bags or pockets, the right choice of fabric to make them is essential, as is their treatment and finishing. A wide variety of fabrics exists. The final choice should always depend on a goal of ecoefficiency for the filter system, so ICT FILTRATION recommends its customers commission a prior technical and economic study. The technical study allows them to choose the right fabric for specific working conditions, while the economic one lets them assess its payback in terms of real, quantifiable savings.

Fabric types and their technical specifications

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Fabric treatments and finishes

All filter fabrics, including needle-punched ones, are subject to what are generically known as “finishing” processes to ensure that the properties of the felt remain stable throughout its useful life (calendering). In turn, they are used to eliminate traces of the paraffins and lubricants used to make them and to smooth the surface of the fabric in contact with the product (singeing), helping the dust to fall off and aiding cleaning.
Some finishes involve chemical baths to enhance their qualities: siliconised, Teflon B 10%, fluorocarbon, PTFE, etc.
Other finishes include coatings to provide certain polymers in paste form applied to the surface in contact with the dust, and high-temperature semi-polymerisation in order to boost the strength of the fabric.
The choice of finish will depend on the properties of the fabric to be improved: increasing retention of fine particles, aiding dust separation, increasing resistance to abrasion, protection against chemical attacks or cleaning of water or acid condensation, for example.
One of the most specific finishes is the application of PTFE membranes. Adhered to felts and fabrics, PTFE membranes increase their capacity for retention without the need for a pre-coating. Like this, the installation will initially work with a friction loss that is higher but much more stable over time, there will be less mechanical and abrasion wear and tear on the element and, in short, it will be more durable thanks to the extended life cycle of the filter bag or pocket.

Mechanical finishes

Because of their special mechanical finishes, special mention must be made of two types of bags and pockets: bags with rings and pockets for asphalt plants.

Bags with rings

Sometimes, in order to avoid the use of the interior cage, the manufacturer fits their filter with bags with built-in rings to perform the same supporting function as a cage in the cleaning and suction system. To prevent the emissions that could result through the small holes that can be left by a needle during the stitching process, ICT FILTRATION fits these intermediate rings by heat sealing, the same finish used in the lengthwise sealing of the bag.

Pockets for asphalt plants

Its special manufacture makes this dust capture system worth special discussion. In the asphalt production process there is nearly always a bag or pocket filter to stop the dust generated in the process from generating emissions. While filters with cylindrical bags are available, it is increasingly common for facilities of this kind to have multi-channel pockets. These pockets, which in most plants are made of aramid because of its good response to the high temperatures involved in the process, can also be made of acrylic materials for plants working cold where condensation values are higher. This avoids possible problems with hydrolysis.

mangas y bolsas filtrantes
mangas y bolsas filtrantes
mangas y bolsas filtrantes

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