These allow automatic separation between the product and the transport air. The product is retained by the filter bags, which are regularly shaken and hit with compressed air to release the material and collect it in the hopper. Today fabric filters for gas-solid separation are the industry standard in pneumatic conveying. Considerable improvements have been made in recent years, especially in the development of technical fabrics.
We offer a wide range of receipt filters: normal, ATEX, special corrosion-resistant, high pressures resistant, explosions and flames resistant. Filters suitable for packaging dust and antistatic filters. We can also accessorize them with quick release, control and verification sensors, explosion vent panels, full access and automatic cleaning system.
HOW RECEPTION FILTERS FOR PNEUMATIC CONVEYING WORK
The principle of operation is based on two fundamental mechanisms, which consists in particles removal from the air flow passing through a porous fabric. The more obvious of the two is a “sieving” mechanism. Particles too large to pass through the fabric mesh are captured and retained on the filter surface. Gradually the captured material will form a layer on the surface of the filter, which will increase in size and need to be removed regularly.
The second mechanism called deep filtration is less obvious, but more important for extremely fine particles. It is for this reason that filters are made of a weave of fabrics rather than a single surface. The air flow and material particles are forced to pass through an extremely tortuous path. Sooner or later, the particles will come in contact with the fibres and adhere to them mainly due to van der Waals forces.
To increase the filters performance, a system can be conceived to humidify the fabric, thereby increasing its adhesive properties. Many types of materials are used to produce filters, primarily wool and cotton, also the cheapest. Fibreglass or other synthetic fibres such as polyethylene, polypropylene, polyamide or Teflon are used to strengthen resistance to abrasion, corrosive chemicals and high temperatures. In addition, surface treatments are available to improve fibres strength, durability and effectiveness.