What is a polyester needle felt filter bag?
Polyester needle felt filter bag is a kind of normal temperature filter material widely used in industrial dust removal systems.It is mainly made of polyester(polyester)fiber through a needle punching process to form a felt base cloth,and then processed by a certain heat setting and surface treatment,and finally sewn into dust filter bags of various specifications.It has good mechanical strength,filtration performance and cost performance,and is one of the most commonly used and most economical and practical filter bag materials in the current normal temperature flue gas dust removal application.
1.Material composition
The basic raw material of polyester needle felt filter bag is polyester staple fiber or filament,which is formed into a three-dimensional interlaced structure of felt layer through combing,web laying,needle punching and other processes.This structure provides good porosity and surface area,so that it has high dust collection efficiency and air permeability.In order to enhance the adaptability of the filter bag in actual working conditions,its surface is often treated with singeing,calendering,lamination,waterproofing,oil-proofing,etc.to improve its filtration accuracy,cleaning performance and service life.
2.Working performance
Applicable temperature:
The continuous working temperature of polyester needle felt is 120℃～130℃,and it can withstand 150℃for a short time.It is suitable for most normal temperature and medium and low temperature dust removal conditions.
Chemical stability:
Polyester has good wear resistance and tensile strength,but it is easy to age in strong acid and alkali environments and is not suitable for high humidity and high temperature occasions containing corrosive gases.In addition,it is also sensitive to oxidizing gases and hydrolysis.
Filtration performance:
Polyester needle felt has a high filtration accuracy,generally reaching more than 99%.After coating treatment,it can even reach the surface filtration level,greatly improving the dust removal efficiency and reducing the system resistance.
Mechanical strength:
Polyester fiber has good folding resistance and tensile strength,adapts to a variety of cleaning methods such as pulse blowing and backblowing,and is not easy to break or deform.
3.Application fields
Polyester needle felt filter bags are suitable for a variety of normal temperature industrial dust control scenarios and are widely used in the following industries:
Woodworking industry:for wood chips and sawdust dust collection
Grain processing:for flour,starch,grain and other dust treatment
Building materials industry:Dust removal in cement loading and unloading,mixing,grinding and other links
Machinery manufacturing:Dust treatment during lathe,grinding,casting and welding
Tobacco and food processing:Production environment with requirements for cleanliness and emissions
4.Surface treatment types
To improve the performance of polyester needle felt,common surface treatment methods include:
Singeing treatment:remove surface hair,prevent dust from embedding into fibers,and improve dust cleanability
Calendaring treatment:flatten the surface,improve surface smoothness,and reduce dust adhesion
Laminating treatment(such as P TFE):Improve filtration efficiency,prevent dust from penetrating,and reduce pressure difference
Waterproof and oil-proof treatment:Prevent dust from absorbing moisture and agglomerating,suitable for humid environments
V.Advantages and limitations
Advantages:
Low price,high cost performance
Fast filtration speed,low resistance,good cleaning performance
Mature processing technology,strong customizability
Applicable to most normal temperature dust control scenarios
Limitations:
Limited high temperature resistance,not suitable for medium and high temperature environments
Acid and alkali resistance and hydrolysis resistance are general,and chemical stability is not as good as high-performance fibers
Susceptible to oxidation and moisture,and life is limited by working conditions
VI.Conclusion
Polyester needle felt filter bags,as a cost-effective normal temperature dust removal filter material,play an important role in the field of industrial dust control with their excellent physical properties and wide range of applications.For conventional dust removal conditions with low temperature and no strong corrosive gases,polyester filter bags are a very ideal choice.By reasonably selecting surface treatment methods and strengthening daily maintenance management,its service life and the operational stability of the dust removal system can be further improved.