Gester Instruments | Professional Textile, Footwear and PPE Testing Equipments Manufacturers Since 1997
Different classification standards for filter media for bag filter
There are many types of filter materials for bag filters. Bag filters are currently widely used in China. Different technologies and methods will use different filter materials for filtration. The filter materials of manufacturers on the market can be roughly classified according to the following methods: 一, According to the material classification of the filter bag: 1. Synthetic fiber filter material: a filter material manufactured with synthetic fiber as raw material, referred to as synthetic fiber filter material. 2. Glass fiber filter material: a filter material made from glass fiber, referred to as glass fiber filter material. 3. Composite filter material: a filter material composed of two or more fibers. 4. Other material filter materials: filter materials made of fiber materials other than synthetic fibers and glass fibers (such as ceramic fibers, metal fibers, carbon fibers, mineral rock fibers, etc.). Second, according to the structure of according to the structure of the filter material can be divided into woven cloth, needle felt, surface filter material, etc. (1) Woven fabric Woven fabric is a fabric made by continuously interlacing warp yarns and weft yarns at right angles according to certain rules. Its basic structure has three types: plain weave, twill weave and satin weave. In order to improve the performance of the woven filter material, the weft double or double layer structure is often used. Machine woven fabric has been the only selectable filter structure for a long time. The emergence of needle felt made it gradually relegated to a secondary position. (2) Needle-punched felt Needle-punched felt is a filter material made by spreading fibers on the bottom 2 sides, or completely using fibers to form by needle punching, and then undergoing post-processing. It does not undergo the weaving process, so it is also called non-woven fabric or non-woven fabric. Needle-punched filter media post-treatment mainly includes heat setting, singeing, hot melt calendering, etc., and some treatment processes such as antistatic, hydrophobic, acid and alkali resistance, oil repellency, and resin covering. The pores of the needle felt are formed between single fibers, so there are multiple pores in the thickness direction, the porosity can reach 70-80, and the pores are uniform. In contrast, the pores of woven fabrics are formed between the yarns, there are no layers in the thickness direction, the porosity is 30-40, and there is about half of the needle felt. Therefore, at the same filtering speed, the pressure loss of needle felt is lower than that of woven fabric, and the dust removal efficiency of needle felt is also higher than that of woven fabric. (3) Surface filter material Surface filter material refers to a filter material in which almost all dust, including fine dust particles, remains on its surface and cannot penetrate its interior. Based on the theory that the dust layer is beneficial to filtration, a layer of microporous film is artificially attached to the surface of the ordinary filter material to improve the efficiency of dust removal. Therefore, the film on the filter surface is also called the artificial dust layer. The advantage is that a thin layer of dust with good air permeability can be formed on the surface of the membrane at the beginning of the filter work, which can ensure high dust removal efficiency and low running resistance.
Cut resistance is one of the most critical performance indicators in personal protective equipment (PPE) testing, directly affecting worker safety in high-risk industries such as metal processing, machinery manufacturing, and emergency rescue. The TDM Cut Test Machine GT-KC28 plays a vital role in accurately evaluating the cut resistance of PPE products, including gloves, protective clothing, footwear materials, composite materials, rubber, and industrial textiles.
By adopting high-precision force control systems, intelligent data processing, and stable transmission technology, the GT-KC28 TDM Cut Tester can accurately measure the critical cutting force of materials and ensure excellent repeatability and comparability of test results. Its user-friendly touch-screen operation, comprehensive data storage, USB data export, and built-in thermal printer greatly improve laboratory efficiency and data traceability.
The TDM Cut Test Machine GT-KC28 fully complies with major international and national standards such as ISO 13997, EN 388, ASTM F2992/F2992M, ANSI/ISEA 105, and GB 24541-2022, making it a reliable solution for PPE manufacturers, third-party testing laboratories, and research institutions. Through precise and standardized cut resistance testing, the GT-KC28 helps reduce industrial cutting injuries, supports PPE certification across global markets, and ensures that protective equipment delivers reliable safety performance in real-world applications.
1. ISO 5402-1: Specifies the flexometer method for testing leather flex resistance under repeated bending.
2. ISO 17694: Defines test methods for footwear upper and lining flex resistance, simulating real-world bending stress to assess long-term durability.
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