P84™ used in filter applications is principally in the form of needle-felted fabric, suitable for use in pulse-jet type dust collectors. The unique, open, trilobal structure of P84™ fibers provides high filtration efficiency, low pressure change, and ease of cleaning.
Up To 500ºF. When it's too hot for other conventional fibers, consider bags made from P84™ polyimide fibers. These filter bags can operate continuously, under practical working conditions, at temperatures of up to 500ºF (260ºC).
P84™ fiber has unique characteristics that give it better collection efficiency. The irregularly shaped trilobal cross section provides a larger specific surface area than round, bean-shaped or rod-shaped fibers-30 to 90% more than cylindrical fibers of comparable size. P84™ has a low specific gravity which offers a maximum amount of surface area for a minimum amount of unit weight. More fine dust can be captured on the surface of the trilobal Fiber, resulting in extremely high collection efficiencies. Needle felts made of P84™ far exceed existing standards or regulations.
Filter bags made from P84™ polyimide are extremely easy to clean because of the anti-adhesive nature of the fibers. Trilobal structure and low surface tension mean the fibers don't hold tightly to dust cake. This keeps fine particles close to the surface, allowing an air pulse to quickly clean the filter. Excellent cake release capability makes cleaning a simple task, resulting in considerable cost savings. Even with the finest dusts, you can achieve long filter bag service and exceptionally good cleaning behavior from P84™ based non-woven filters.
P84™ fiber remains flexible and strong even at the high end of its temperature range. Combined with good abrasion resistance and chemical stability, these properties ensure long and continuous working life for baghouses utilizing P84™ filter bags.
Less Pressure Drop For Lower Operational Costs
The special manufacturing process Imi-Tech uses to make P84™ fiber results in uniquely formed irregular trilobal fiber cross sections, creating more surface area and smaller voids. Non-woven filter material made from P84™ allows air to pass easily through the filter, for lower pressure drop, providing savings in energy costs because of the continuous low pressure drop. P84™ exhibits exceptional filtration characteristics even though it is generally considered to be a material intended for high temperature application. P84™ fiber is sometimes also combined with other materials designed for lower temperature use such as polyester, simply to enhance fine particle collection efficiencies and to improve operating pressure differentials.
Over A Broad pH Range Filter bags constructed of P84™ fibers exhibit relatively good resistance to both acids and bases over a broad range of pH environments. Many successful P84™ installations around the world operate in alkaline environments.
It is important to recognize that the service life of filter bags in high temperature applications can, in many cases, be influenced more by operation and maintenance practices than by actual flue gas constituents. Since every installation is an individual case, we invite and encourage our customers to discuss their respective applications with us.
Successful Applications Around The World
Increasingly stringent regulations for dust emissions from high temperature industrial processes have accelerated the development of flexible filters made from high performance fibers. Many industrial operations are turning to filter bags made from high performance fibers such as INSPEC FIBRES P84™.
P84™ has been found to be cost effective for a broad range of applications across the globe. These include:
Fabrics made of P84™ have an exceptional ability to handle dust containing relatively high percentages of submicron particles - and do so at low operating pressure differentials. The combination of filtration capability and thermal stability, along with chemical resistance across a wide pH range, make P84™ polyimide fiber a very important material for textile filter media. With more than 10 years on the world market, P84™ has proven to be a cost effective solution to a wide range of filtration and dust collection applications.
