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Polyester needle felt water& oil proof dust filter bag
Product Item: Water and Oil Repellent Felt
Product Introduction: During the running of dedusting bags, the gas includes moist, hygroscopic   and deliquescent powders. It will create the water or oil membrane on the surface of powder to   increase the cohesion, but it will make the dust removal more difficult. Especially under the high   temperature, it will directly affect the normal work by dewfall due to the outer cool air.   Considering this, ordinary felt has to adapt the special treatment to improve the working   efficiency. In recent years, our company treats the polyester felt, polypropylene felt, anti-static   felt, and Aramid felt with the active fluoride. Each type of felt has obtained the ideal water and   oil repellent effect.  After treatment, those filter material can form the molecular   barrier around the fiber, which may prevent water and dirt attaching and leaking. Compared   with the common filter material, it has the water and oil repellent character; moreover, it also   has the anti-cohesiveness and easiness for cake peeling off. This product is especially for   southern places of moist and rainy.
Principles of water and oil repellent: 
  Being dipped in the active fluoride mixed treatment fluid, some functional groups of  macromolecule will react with treatment fluid, and forms the macromolecular chain. The  reaction will change the water and oil affinity of the fiber; reduce the surface tension of filter  material, until it becomes smaller than the surface tension of water and oil. In this way, we get   water and oil repellent felt.
Production process: 
  shredding --- combing --- Lapping ---pre-needle punching---needle punching --- calendering---  dipping in the treatment fluid--- curing --- heat setting --- finished product
Material Polyester Picture
Weight (g/m2) 500
Thickness (mm) 1.65
Air permeability(m3/m2/min) 15
Breaking strength(N/5*20cm) Warp ≥1000
Weft ≥1100
Elongation (%) Warp ≤35
Weft ≤40
Constant working temperature (℃) 130
Instant working temperature(℃) 150
Finishing  Singed, calendering
Surface electric-resistance (Ω) < 10E5
Volume electric-resistant (Ω) < 10E5
Friction voltage(V ) < 500
Surface density (μC/m2) < 7
Half life (S) < 1
Acid resistant common
Alkali resistant inferior
Abrasion resistant excellent
Hydrolyze stability inferior