Filter bags are generally cylindrical in shape and can be made of various materials such as PE, PP, and PTFE. Each material is suitable for different working conditions due to its distinct characteristics. Based on the deep - filtration mechanism, when dusty gas or liquid flows through, the loose and porous fiber structure inside captures impurities through means like collision, diffusion, and electrostatic adsorption, thus achieving separation. Filter bags are widely used in fields such as heavy - industry waste - gas treatment, liquid purification in the food and pharmaceutical industries, purification of production water in the automotive manufacturing industry, and air filtration. They are crucial filtration tools for ensuring the normal progress of production.
Different materials have different properties. For example, filter bags made of PE material have a relatively low cost and good acid and alkali resistance. PP material performs outstandingly in terms of chemical corrosion resistance and heat resistance. PTFE material, in particular, features excellent chemical stability and ultra - high - temperature tolerance.
During the steel production process, in links such as iron - making blast furnaces and steel - making converters, a large amount of high - temperature dust - laden waste gas and corrosive gases are generated. PTFE has stable chemical properties and high - temperature tolerance, making it a good choice.
Food production has extremely high requirements for hygiene and safety. Whether it is the liquid filtration during raw material processing and the production process or the air purification in the workshop, no impurities or microorganisms are allowed to mix in. The materials of filter bags are usually PE or PP.
In chemical strong - acid production workshops like those for sulfuric and hydrochloric acid, strong - acid - resistant filter bags are essential. For instance, PP filter bags suit general acidic waste liquids, and PTFE ones are for waste liquids with multiple organic solvents.
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