As the core component of the “primary – medium – high efficiency/ultra-high efficiency” three-stage filtration system in the air purification system, the medium-efficiency bag filter mainly functions to intercept 0.5 to 10μm particles (such as dust, pollen, fine fibers, and some microorganisms) that are not captured by the primary filter, reducing the load on the high-efficiency filter at the back end and extending its service life. At the same time, further enhance the air cleanliness. With the characteristics of “high dust holding capacity, low resistance and strong adaptability of filtration efficiency”, it is widely used in scenarios where there are clear requirements for air quality but no need to reach extremely high cleanliness standards (such as Class 100, Class 10). Specifically, it can be divided into the following six major categories: I. Medical and health field: Ensure a sterile and low-bacterial environment Medical scenarios are sensitive to microbial and particulate contamination. Medium-efficiency bag filters are the “key barrier” of clean air conditioning systems, with the core function of controlling the risk of nosocomial infections. Specific applications include: Hospital clean areas: such as Class III to IV clean operating rooms (corresponding to Class 10,000 and Class 100,000 cleanliness levels), icus (Intensive

In the production process of the pharmaceutical industry, dust pollution not only affects the quality of drugs and threatens the health of operators, but also may cause safety risks (such as dust explosions). Therefore, efficient dust removal is one of the core links for the compliance and safety of pharmaceutical production. Medium-efficiency bag filters, as key equipment in dust removal systems, are widely used in pharmaceutical dust control scenarios due to their stable filtration efficiency and strong adaptability. This article will conduct a detailed analysis from four dimensions: application scenarios, core technical features, key points for selection, and optimization directions. I. Core application Scenarios of Medium-Efficiency Bag Filters in the Pharmaceutical Industry The sources of dust in the pharmaceutical industry are diverse (such as raw material crushing, mixing, granulation, tablet pressing, coating, etc.), and the properties of the dust vary greatly (such as organic dust, inorganic dust, bacteria-containing dust, etc.). Medium-efficiency bag filters are mainly used in the “pretreatment + intermediate purification” stage, connecting primary filtration and high-efficiency filtration (HEPA). The specific application scenarios are as follows: Dust removal in the production process of solid dosage forms Solid dosage forms (such as tablets, capsules, and granules) are the areas where

When choosing non-woven high-efficiency filters (HEPA) in the air purification system of nuclear power plants, it is necessary to take nuclear safety regulations as the core basis, and combine the special requirements of the air purification scenario such as radiation protection, aerosol control, and system stability. A comprehensive assessment should be conducted from multiple dimensions including filtration performance, structural safety, environmental adaptability, and compliance to ensure that the filters can not only meet the purification efficiency requirements but also It can also cope with the complex working conditions of nuclear power plants (such as radioactive aerosols, temperature and humidity fluctuations, long-term operating loads, etc.). The following are the specific selection dimensions and key indicators: 1. Give priority to meeting the core performance indicators of nuclear-grade filtration The core objective of air purification in nuclear power plants is to retain radioactive aerosols (such as fission products and activation products), preventing the spread of radioactive substances into the environment or affecting the safety of equipment/personnel. Therefore, filtration performance is the primary consideration, and the following indicators should be given particular attention: Key indicators Nuclear-grade application requirements   Filtration efficiency It must reach grade H13 or above (in accordance with EN 1822 standard),

In the air purification system of nuclear power plants, the non-woven high-efficiency filter (HEPA filter) is essential for ensuring air quality and preventing the spread of radioactive aerosols. Safety assurance must encompass all stages, including design, materials, performance, installation, operation, maintenance, and emergency response. The core goal is to ensure the filter effectively retains radioactive particles under both normal and accident conditions (such as LOCA or water loss), thus protecting the environment and personnel. The following is an analysis of its security system across six core dimensions: I. Design Safety: Special structural design adapted to the nuclear environment The design of high-efficiency filters without separators for nuclear power plants needs to break through the conventional industrial filter standards and be specially optimized for extreme conditions such as high radiation, high humidity, and potential high temperatures (accident conditions) in nuclear facilities. The core design guarantees include: Balanced design of airflow resistance and dust holding capacity Adopting a low-resistance “V-shaped” or “W-shaped” pleated structure (with a filtration area increased by 3 to 5 times compared to the flat type), it ensures air volume (usually adapted to the air volume requirements of the nuclear island ventilation system, with a single unit air volume

Correct installation and maintenance of high-efficiency filters with separators are the keys to ensuring their filtration efficiency, extending their service life and maintaining the cleanliness of the painting workshop. The following elaborates from five dimensions: pre-installation preparations, standardized installation procedures, key points of daily maintenance, replacement standards, and precautions, providing practical operation guidelines. I. Preparations before Installation: Avoid risks in the early stage The inspection and preparation before installation directly affect the subsequent filtration effect. Special attention should be paid to the three core aspects: “filter status, installation environment, and tool matching”. Inspection of the appearance and performance of the filter Appearance acceptance: Check whether the filter frame (galvanized steel plate, aluminum alloy, etc.) has any deformation, rust or scratches. Check whether the filter material (mainly glass fiber) is damaged, wrinkled or leaking glue. Check whether the sealing rubber strips (such as nitrile rubber, silicone rubber, etc.) are intact, have not fallen off, and are closely attached to the frame. Performance verification: Check whether the model of the filter, filtration efficiency (such as H13), rated air volume, and temperature resistance grade are consistent with the design requirements (it needs to match the working conditions of the spray booth/curing room in

In industrial painting workshops, coating quality, production safety, and employee health are core concerns. Air cleanliness critically affects coating outcomes by influencing defect rates. Pleated high-efficiency filters, known for high filtration efficiency and structural stability, have become essential in air purification for these workshops, supporting stable coating processes and ensuring product quality. ​ I. Core Demands for Air Purification in Industrial Painting Workshops The industrial coating process (such as painting, drying, pretreatment, etc.) has strict requirements for the air environment, mainly due to the following three demands: Coating quality assurance requirements: During the coating process, if dust, fibers, metal debris and other particles in the air adhere to the surface of the workpiece to be coated or the coating that has not dried, it will directly cause defects such as pitting, particles and scratches on the coating, seriously affecting the appearance and protective performance of the product, and may even lead to rework or scrapping. ​ Production safety control requirements: Some coating processes use solvent-based paints, which will release flammable and explosive organic waste gases such as toluene and xylene. Meanwhile, if the paint mist produced during the spraying process accumulates for a long time, it will not only clog

The transfer window is a dedicated “isolation channel” for the transfer of materials between the clean space and the non-clean area (or areas of different cleanliness levels) in new energy factories. Its core function is to minimize the contamination of the clean area caused by the entry and exit of materials during the material transfer process, and at the same time avoid cross-contamination between different areas. It is a key auxiliary device for ensuring the sealing and cleanliness of the clean space. In the production of new energy (such as lithium batteries, photovoltaic, hydrogen fuel cells), materials (such as electrode sheets, separators, battery casings, photovoltaic glass, catalysts, etc.) need to frequently flow between the storage area (non-clean) and the production workshop (clean), or between processes of different cleanliness levels. The transfer window is precisely designed to address the “contamination risk during material flow” The specific functions can be broken down into the following four points: I. Core Function: Block contamination channels and prevent external contaminants from entering the clean area Particles, dust and microorganisms in the air of non-clean areas (such as raw material warehouses and logistics channels) will directly affect product quality if they enter the clean production area

V-shaped pleated high-efficiency filters (commonly referred to as “V-shaped HEPA filters”; HEPA stands for High-Efficiency Particulate Air) are widely used in clean Spaces of new energy factories (such as lithium battery, photovoltaic, hydrogen fuel cell and other production bases) due to their core advantages of high filtration efficiency, large dust holding capacity, low resistance and compact design. It is a key purification device for ensuring the cleanliness of the production environment and improving the yield of products. The following is a detailed explanation from five dimensions: application background, core value, specific application scenarios, key points of selection and maintenance, and technical trends. I. Application Background: The strict requirements for clean Spaces in new energy production The production process of new energy products (especially lithium batteries and photovoltaic modules) is extremely sensitive to particles (dust, metal impurities), microorganisms, humidity, static electricity, etc. in the environment. Even the slightest pollution may directly lead to product failure or performance degradation. In the core processes of lithium batteries such as electrode coating, rolling, stacking/winding, and liquid injection, if there are micron-sized dust or metal particles in the environment, it may cause short circuits in the electrode, battery bulging, and even fire risks. During the

The maintenance and replacement cycle of the pleated high-efficiency filter (usually referring to the pleated high-efficiency air filter, which uses glass fiber filter paper as the filter material and aluminum foil or paper as the separator) has no fixed standard. It needs to be comprehensively judged based on the usage scenario, pollution level, equipment parameters and compliance requirements. The core basis is the degree of filtration efficiency attenuation and resistance change. The following is the specific analysis: I. Core Judgment Indicators: Resistance and Filtration Efficiency The core logic of maintenance and replacement is that when the filter resistance rises to the “final resistance” or the filtration efficiency drops to the point where it cannot meet the cleanliness requirements, it must be replaced. These two indicators need to be confirmed through regular monitoring. Indicator type Definitions and Standards Monitoring method Resistance monitoring Initial resistance: The resistance of a new filter at its rated air volume (provided by the manufacturer, typically 150-250Pa). Final resistance: The resistance when the filter can no longer be used, generally set at 2 to 3 times the initial resistance (such as 300-750Pa). Read through the differential pressure gauge that comes with the air handling unit/air conditioning unit;

Partition High-Efficiency Particulate Air Filters (Partition HEPA) are core devices for achieving local cleanliness and airflow zoning in laboratory environmental control. Unlike conventional ceiling-mounted or air outlet HEPA filters, they build independent clean units or isolation areas through physical separation and high-efficiency filtration. They are widely used where strict particle contamination, cross-contamination, or biosafety control is required. I. Core Definition and Working Principle The separator high-efficiency filter features a built-in separation structure: a metal or high-strength plastic frame (often aluminum or stainless steel) filled with glass fiber or PTFE filter medium and sealed by rubber strips. The frame extends to form a partition plate, connecting to laboratory surfaces to fix the filter’s position and block direct airflow between sides. Working principle Airflow enters through the filter’s intake side. Particles ≥0.3μm are removed by interception, inertial collision, diffusion, and gravitational sedimentation (filtration efficiency ≥99.97%, as per EN 1822 or GB/T 13554 standards). The filtered clean air flow is discharged from the “outlet side” and enters the target clean area. The partition structure of the frame can prevent unfiltered airflow from leaking through the gaps, ensuring complete isolation of airflow between the clean area and the non-clean area. Ii. Key Application Scenarios

V-shaped pleated high-efficiency filters play a crucial role in maintaining cleanliness and supporting production quality in the electronics manufacturing industry. The following demand analysis highlights how these filters address core industry requirements: First, the strict demand for cleanliness in precision production stands out. Electronic products are constantly evolving towards miniaturization and precision. For instance, as chip manufacturing enters the nanometer process stage, particles larger than 0.1 microns can all lead to faults such as short circuits and open circuits in chips. According to the international standard ISO 14644-1, most electronic manufacturing workshops often need to reach ISO Level 5 or higher clean standards. The V-shaped pleated high-efficiency filter can efficiently intercept fine particles ranging from 0.1 to 0.3 microns, meeting the strict cleanliness standards of electronic manufacturing workshops. It can reduce the defect rate of products caused by particle contamination by 60% to 80%. In addition to cleanliness requirements, the pollution sources are complex and require strong filtration. The pollution sources in the electronic workshop are rich and diverse, including dander and clothing fibers produced by personnel activities, metal shavings and oil mists released by the wear and tear of production machinery, dust and industrial waste gas introduced from outside,

In the electronic manufacturing environment, ensuring the stable operation of V-shaped pleated high-efficiency filters (hereinafter referred to as “V-shaped high-efficiency filters”) is a core link in maintaining the cleanroom grade and guaranteeing production quality. A full life cycle management system needs to be established from five dimensions: selection and matching, installation control, operation monitoring, maintenance management, and environmental coordination. The specific measures are as follows: I. Early Stage: Precise selection to match the clean requirements of electronic manufacturing from the source Selection is the foundation for stable operation. It is necessary to precisely match parameters such as the cleanliness level (mainly ISO 3-5), air volume requirements, and pollutant characteristics of specific scenarios in electronic manufacturing (such as chip lithography rooms, PCB assembly workshops, packaging and testing rooms, etc.) to avoid unstable operation caused by “insufficient selection” or “excessive selection”. The filtration efficiency matches the cleanliness grade According to the cleanliness level requirements of the workshop, select the filter with the corresponding efficiency grade: ISO Class 5 (Class 100) cleanroom: H13/H14 class (EN 1822 standard) is preferred, with an interception efficiency of 0.3μm particles ≥99.95%/99.995%. ISO Grade 4 (Grade 10) and above: U15/U16 grade should be selected to meet the more