According to the requirements of technical specifications and working conditions, our company uses excellent aramid fiber as raw material, adopts international advanced standards, and uses advanced production equipment to manufacture aramid high-temperature needle punched filter felt. The surface layer of filter material adopts aramid fiber. The surface layer and base cloth layer are combined through multiple needle pricking, singeing and calendering finishing, and the whole is impregnated with PTFE (polytetrafluoroethylene), After high-temperature sintering, a dense protective film is wrapped on the fiber surface, which greatly improves the comprehensive performance of the filter material.
Aramid needle felt filter bag has the advantages of high temperature resistance, corrosion resistance and long service life. The aramid needle felt filter bag is sewn with excellent PTFE sewing thread with high strength, good wear resistance and temperature resistance above 260 ℃ and imported full-automatic filter bag production line to ensure the processing quality of the product.
1. Material description
Aramid can withstand the temperature below 200 ℃ under dry conditions. It is a polycondensation polymer like polyester. It is a filter material used in high-temperature applications where polyester will be brittle and fail. Aramid fiber has very good bending resistance and wear resistance, which is better than most synthetic fibers. Special technology is usually used for singeing or other post-treatment.
Non stick: the surface is smooth. It is a very small surface tension in solid materials and does not adhere to any substances.
2. Process flow of aramid needle felt filter bag
The base cloth of Kevlar needle felt filter bag adopts excellent high-strength Kevlar long fiber and is woven into high-strength Kevlar base cloth to ensure that the filter material has sufficient mechanical strength. After pretreatment process and heat setting processing, high-performance Kevlar base cloth with excellent physical and chemical indexes and stable size is made.
? the surface layer of the aramid needle felt filter bag is made of aramid fiber and high-performance aramid base cloth. The aramid fiber has good spinnability and can significantly improve the composite fastness and overall strength of the filter material.
? after the filter material is made, using the unique post-treatment production process of Hongsheng company and the "polytetrafluoroethylene (PTFE) mixed solution", according to the post-treatment formula for cement working conditions, the product is impregnated as a whole, and then after high-temperature sintering treatment, the fiber surface is wrapped into a layer of PTFE (polytetrafluoroethylene) protective film, which greatly improves the oxidation resistance, corrosion resistance, temperature resistance and dimensional stability of the filter material; Enhance the hydrophobicity of the filter material, improve the filtration accuracy of the filter material and prolong the service life of the filter material.
3. Product characteristics of aramid needle felt filter bag
Due to the excellent material performance of aramid needle felt filter bag and the enhanced effect of production process, various performance indexes of the product are extremely prominent. The main characteristics are summarized as follows:
(1) Low energy consumption
Aramid needle felt filter bag base cloth is made of high-strength aramid filament with soft texture. It has good jitter during ash cleaning, easy dust stripping, low ash cleaning pressure and less ash cleaning times, which can effectively reduce the consumption of compressed air, reduce the amount of maintenance and save the operation cost. The aramid needle felt filter bag is not affected by special powder and gas, so it has very good applicability.
(2) High filtering precision
In order to ensure the filtration accuracy, our company takes aramid fiber as the surface layer. The surface filter layer formed by impregnating the fiber with PTFE (polytetrafluoroethylene) is more dense than the ordinary filter material filter layer, forming A-type structure on the micro level. The filtration mechanism belongs to surface filtration. Processed by impregnation membrane process, the filter material has small pore diameter and high porosity, which improves the filtration accuracy of the filter material, It can separate all the dust larger than the micropore diameter, so the dust purification efficiency is high and stable, and it is easy to meet the dust emission requirements.
(3) High operating temperature
The aramid fiber used in the filter bag of aramid needle felt is not thermoplastic fiber, which has long-term thermal stability and can be used for a long time in the range of - 196-204 ℃; The shrinkage is only 1% at 250 ℃, and it will not embrittle, soften or melt when exposed to high temperature of 300 ℃ for a short time, and the dimensional stability is very good; Within 100 hours at 260 ℃, the mechanical strength remains 65% of the original; A small amount of gas, such as CO2, Co, N2, etc., can be decomposed only above 370 ℃.
(4) High flame retardancy
The aramid fiber used in the aramid needle felt filter bag will not continue to burn when it leaves the flame. Anti oxygen index (LOI ≥ 28), belonging to intrinsically flame retardant fiber; Neither spontaneous combustion nor combustion supporting. Even if it is ignited, it will self extinguish after removing the flame; Not like ordinary thermoplastic fibers, they will suddenly soften and burn without producing droplets.
(5) Good corrosion resistance
The aramid needle felt filter bag has outstanding corrosion resistance. The aramid fiber has stable chemical structure, can withstand most high concentration inorganic acids, has good alkali resistance at room temperature, and is also very stable to other chemical reagents and organic solvents. Moreover, after PTFE (polytetrafluoroethylene) impregnation treatment, the filter material can resist the erosion of various acids, alkalis and other corrosive substances, and the base cloth will not be eroded in use.
(6) Good oil and water repellency
The whole filter bag of aramid needle felt is impregnated with PTFE (polytetrafluoroethylene) to enhance the hydrophobicity of the filter material. The PTFE (polytetrafluoroethylene) lotion impregnation makes the surface of the filter material smooth and the friction coefficient low, which eliminates the adsorption of the filter material to water and effectively reduces the hardening phenomenon after condensation.
(7) Good applicable conditions
The physical and chemical properties of aramid needle felt filter bag are very good. The performance of aramid needle felt filter bag can very well meet the use requirements of current working conditions.
(8) Sewing technology, fine processing
The sewing of filter bag shall comply with relevant provisions of industrial standards HJ / t326-2006 and GB / T 12625. Cutting with CNC slitting machine, with stable size and no deviation; The bag barrel sewing is controlled by a continuous production line, and the product quality is better and more stable; The bag mouth expansion ring adopts stainless steel expansion ring. The upper and lower pieces of the bag body stitch are flat, the interface parts of the bag mouth and bag bottom are folded evenly, and there will be no gap when the filter bag is installed on the flower board. The bag body adopts high-strength PTFE (polytetrafluoroethylene) thread sewing system to prevent thread opening caused by corrosion; Guide and manage each production process in strict accordance with the standards of ISO9001:2008 quality management system, and establish the concept of ***** quality management. More than 50 processes are required from raw material inspection, cleaning to finished product warehousing. Each process is equipped with key quality control points to strengthen quality control in the production process. A four-level inspection system of "employee self inspection, workshop inspection, quality control patrol and random inspection from time to time" has been established.
The quality concept of "no sequence transfer, no warehousing and no delivery" shall be firmly adhered to for nonconforming products; Take "zero shortage, zero negative evaluation and zero return" as the 0 goal.
5. Advantages of aramid needle felt filter bag in working conditions
The aramid needle felt filter bag of Hongsheng company has the characteristics of high filtration precision, good ash removal, low operation cost and long service life. It has been recognized by people in the industry. The application effect of aramid needle felt filter bag is very good. The surface of aramid needle felt filter bag is smooth, easy to remove ash, and the resistance increases very slowly, so it is easy to meet the requirements of smoke emission concentration. Aramid needle felt filter material is a commonly used non-woven filter material for dust remover. The product has the following advantages:
a. The fibers in the aramid needle felt filter material are arranged in a three-dimensional staggered and three-dimensional structure. This structure is conducive to the rapid formation of dust layer. There are no direct pores at the beginning of dust filtration and after dust removal. The dust collection effect is very stable, and the dust removal rate is higher than that of ordinary fabric filter materials. The test results show that the dynamic dust collection rate can reach more than 99.9%.
b. Aramid needled felt has no or only a small amount of twisted warp and weft yarn (with base cloth), and the porosity is as high as 70% ~ 80%, which is 1.6 ~ 2.0 times that of ordinary fabrics. Therefore, it has good air permeability and low resistance.
c. It is easy to form an automatic one-stop production line, which is convenient for monitoring and ensuring the stability of product quality.
d. Fast production speed, high labor productivity and low product cost.