Industrial High Temperature Resistance Aramid(aromatic Polyamide) Fiber Waterproof Filter Cloth (needled Felt)
Our company is the authorized producer for the “NOMEX” filtration material of the fiber department of Dupont group China. NOMEX ® fiber has the characteristics of heat and flame retardant. The continuous working temperature is 204℃ and instantaneous working temperature is 240℃. Its unique...
Our company is the authorized producer for the “NOMEX” filtration material of the fiber department of Dupont group China. NOMEX® fiber has the characteristics of heat and flame retardant. The continuous working temperature is 204℃ and instantaneous working temperature is 240℃. Its unique structure if β-aromatic ring and the key link between conjugate amine very strong. It can resist the chemical attack. Therefore, NOMEX® will not melt or drop, even explode the high temperature environment for long time. It will only be scorched(LOI: limit oxygen index is 29%). But in general the hot flue gas contains not only water but also mixed with acid gases and other impurities, such as: sulfur oxide, hydrochloric acid, nitric oxide, calcium hydroxide etc. These gases will accelerate the hydrolysis reactions of the filtration bag (NOMEX regain rate of water is 4.5%). Especially when the dust collection room is below the dew point of acid, the hydrolysis effect is more serious. Therefore, we recommend that the temperature of the dust catcher should be controlled at 20℃ above the dew point while using NOMEX® filtration bag. The filtration bag is the best choice for the dust collection for the fields of asphalt-stirring, steel, cement and other high-temperature conditions.
NOMEX is the trade name of the high temperature resistant non-woven needled felt made with the fiber produced by Dupont US, CONEX is that of the product made with the fiber produced by Tejin Japan.
The filtration bag made with the fiber has the advantage if good high temperature resistance and good dimension stability. It also resists to acid and alkaline. The product is widely used in fields of chemical industry, steel and iron, carbon, cement, asphalt-stirring etc. It is the most widely used materials in the field of dust collection at high temperature.
Waterproof and oil-proof function of the non-woven needled felt product
In some of the working conditions, the water contains of the flue gas is high and the temperature of it is relative low. The humidity in the gas then turns to dew on the surface of the filtration bag. That often leads to the dust sticking on the surface of the bag and reduction of the filtration function. The waterproof and oil-proof function for the common needled felt material/bag are all not good. In order to prevent the above mentioned problem. We should apply the pos-treatment of dipping or surface coating of water-proof materials for the filtration material. The materials will have the function of waterproof and oil-proof function after the treatment and the size-fixing process under high temperature. The technology makes the filtration on bags having the same ideal performance even in the high humidity conditions.
Anyhow, the high humidity gas, especially the gas that contains water-absorbable dust, is easy to lead the dust sticking on the filtration bag. We recommend that the customers should choose the regular and simple round bag but not the flat bag with complex sharp and design. The working temperature of the dust catcher should be controlled to 10℃-20℃ higher that the dew point.