During the operation of a bag filter, if the dust in the gas contains a lot of moisture and oil, as well as hygroscopic and deliquescent dust, a water or oil film may form on the surface of the dust, increasing its adhesion. Although this helps to capture dust, it will make cleaning difficult Especially when high-temperature gases are in a high humidity state, condensation occurs due to the cooling effect of external gases This not only causes the captured dust to scale and even clog on the surface of the filter bag, but also corrodes the structural materials, increasing the operating resistance of the dust collector and directly affecting the normal operation of the bag filter In view of this, ordinary filter media must be further improved in functionality to adapt to this special working condition, prevent or reduce dust bag sticking, and improve the service life and work efficiency of filter media.
In recent years, our company has selected reactive fluoride additives for post-treatment of various filter materials such as polyester, polypropylene, anti-static needle punched felt, aramid needle punched felt, etc., all of which have achieved ideal water and oil repellent effects Not only does the water and oil repellent grade test meet national standards, but it also does not affect the appearance style and internal indicators of the original needle punched felt
Water and oil repellent mechanism: A reactive fluoride additive is used to prepare a mixed working fluid to impregnate the filter material, causing the working fluid to react with certain groups in the macromolecular structure of the filter material fibers, forming macromolecular chains, changing the affinity between the fibers and water and oil, reducing the surface tension of the filter material to less than that of water and oil, in order to achieve the purpose of water and oil repellent After being treated with water and oil repellent agents, various filter materials can form molecular barriers around the fiber surface, which can prevent water and various oil pollutants from adhering to and penetrating Compared with ordinary filter media, it not only has water and oil repellent properties, but also has anti adhesion and easy peeling properties for dust This product is particularly suitable for filtering applications in southern or rainy areas of China, as well as in areas with high air humidity
Production process: fiber loosening – combing – laminating – pre needle punching – main needle punching – calendering – impregnation with water repellent and oil proof working fluid – baking – heat setting – finished product
| Product Name | Polyester waterproof and oil proof needle punched felt | PPS water and oil repellent needle punched felt |
| Fiber composition | Polyester staple fiber 2.2D/1.56D | PPS short fiber 2.2D100% |
| Composition of base fabric | Polyester filament | PPS short fiber |
| Weight in grams | 550g/m2 | 500g/m2 |
| Thickness | 1.9mm | 1.7mm |
| Water resistance level | Level 4 | |
| Air permeability (m3/m2)/ min@12.7mmH2O ） | 12 | |
| Longitudinal strength (N/5cm) | 1000 | 800 |
| Lateral strength (N/5cm) | 1800 | 1300 |
| Longitudinal elongation at break | 35％ | 35％ |
| Longitudinal elongation at break | 45％ | 45％ |
| Continuous operating temperature | 130 ℃ | 170 ℃ |
| Instantaneous operating temperature | 150 ℃ | 232 ℃ |
| Surface treatment | High temperature hot pressing and hair shaping | Burnt hair, pressed light, water repellent and oil proof treatment |