Clean rooms can provide a relatively dust-free and sterile environment to ensure product quality and protect personnel health. They are suitable for various high-demand scientific research, production and manufacturing fields, the most common of which are semiconductors, biomedicine and other fields.
In clean rooms, plate type primary filters are a common purification process equipment, and their structure mainly includes outer frame, filter material and protective net. The outer frame is usually made of paper frame, aluminum alloy frame, galvanized iron frame or stainless steel frame. The filter material is made of non-woven fabric, nylon mesh, activated carbon filter cotton, metal mesh and other materials. The protective net has two types: double-sided plastic-sprayed wire mesh and double-sided galvanized wire mesh, which can be selected according to actual needs.
In general, the design features of clean room plate type primary filters are as follows:
1. The folding primary filter adopts a welded wire mesh, which is treated with surface anti-rust and can effectively fix the linear pleated structure.
2. The galvanized iron mesh of the primary filter is attached to the air outlet surface of the filter material, which can protect the filter material from being blown and deformed due to excessive wind pressure, ensuring that all filter material surfaces can be fully utilized.
3. The primary filter adopts a gradient structure, providing a larger filtration area. The filtration area of the folded filter is 5 times that of the general flat filter.
4. The primary filter can use ordinary or moisture-proof paper frames to reduce costs. After use, the paper frame filter can be incinerated, which is pollution-free and meets environmental protection requirements.
5. The folded primary filter has a variety of filtration efficiencies to choose from, generally G1-G4.
The clean room plate primary filter is mainly used for primary filtration of fresh air and air conditioning systems, effectively filtering particles, dust and various suspended solids above 5.0μm. It can be used as a primary filter for air intake and exhaust devices, and can be used for primary or intermediate filtration of air conditioning filtration systems. This filter is widely used in ventilation and air conditioning systems of large civil buildings such as office buildings, hospitals, shopping malls, gymnasiums, and airports. When used with medium efficiency filters, it can effectively protect expensive high efficiency or ultra-high efficiency filters.
Through its unique design features and application areas, clean room plate type primary filter can effectively improve air quality, which is of great significance for protecting people's health and comfort.
In the use of dust-free workshop, in addition to understanding the management system of dust-free workshop, we must also know how to control the humidity of dust-free workshop. The temperature and humidity of dust-free workshop are mainly determined according to process requirements, but under the condition of meeting process requirements, people's comfort should be considered. Therefore, we need to take effective solutions to the situation of high humidity in dust-free workshop.
How to reduce the high humidity in the dust-free workshop:
High humidity actually reduces the accumulation of static charge on the surface of the dust-free workshop and clean room. Lower humidity is more suitable for the accumulation of charge and becomes a potentially destructive source of static discharge. When the relative humidity exceeds 50%, the static charge begins to dissipate rapidly, but when the relative humidity is less than 30%, it can persist for a long time on an insulator or ungrounded surface. Therefore, in an environment with high relative humidity, the capillary force of concentrated water forms a connection bond between the particles and the surface, which can increase the adhesion of the particles to the siliceous surface. It is not important when the relative humidity is less than 50%, but when the relative humidity is around 70%, it becomes the main force for adhesion between particles.
Solutions to high humidity in dust-free workshops:
1. Increase dehumidification and drying: Add a dehumidifier in the clean workshop to increase the dryness of the workshop, and add it in the air conditioning duct during installation.
2. Seal equipment: Seal the equipment that may be affected as much as possible to reduce the impact of the humid environment in the workshop to achieve the purpose of safe storage.
3. Maintain ventilation: Ventilation can form convection of air inside and outside the workshop. When the temperature difference between inside and outside the workshop is greater, the air will flow faster, and the dehumidification effect on the workshop will naturally be more significant.
4. Moisture absorption in the workshop: In the rainy season or rainy days, when the humidity in the workshop is too high and it is not suitable for product storage, and the humidity outside the workshop is too high, it is not suitable for ventilation and moisture dissipation. You can use moisture absorption in the sealed warehouse to reduce the humidity in the warehouse.
In view of the problem of excessive humidity in the dust-free workshop, the use of a comprehensive solution can effectively improve the control ability of the workshop environment. Strengthening ventilation, using dehumidification equipment, controlling temperature, managing materials and strengthening monitoring are all important measures to ensure the stability of humidity in the dust-free workshop. Through these methods, the smooth progress of the production process can be ensured and the quality and safety of the products can be maintained.
Air filters are a type of air filter characterized by high filtration precision, high resistance, and high cost. They are essential consumables for industrial cleanrooms. Recent advances in air filtration technology, including the research and development of filter media, filtration mechanisms, and the development and application of filtration equipment, have significantly boosted the development of air filters!
Industrial Cleanrooms
Industrial cleanrooms require continuous and effective removal of even smaller particles. HEPA filters were once used for end-of-line filtration, while ULPA filters are now the highest-precision ultrafiltration filters. They generally utilize fine glass fiber filter media, but membranes and electrostatically enhanced media have also made inroads into this field, seeing some experimental application and achieving significant progress. The most stringent requirements for exhaust gases emitted by production plants are toxic gases. Filters used in industrial cleanrooms will continue to evolve in line with modern technology, aiming for higher precision, lower filtration resistance, and more effective performance.
Pharmaceutical Factory Sterile Workshops
The production environment in pharmaceutical factory sterile workshops must strictly control microbial and particulate contamination. Industrial air filters employ a three-stage filtration system: a primary filter (G4) intercepts large dust and hair particles, a medium-efficiency filter (F8) further filters particles larger than 1 micron, and a high-efficiency filter (H13) effectively intercepts particles 0.3 microns. In addition, some workshops are equipped with chemical filters at the end, filled with activated carbon or chemical adsorbents, to remove residual harmful gases and odors from the air and prevent pharmaceutical contamination. To ensure sterility, the filter frames are often made of antimicrobial materials. After installation, they must undergo integrity testing (such as PAO testing) to ensure the sealing and effectiveness of the entire filtration system.
Food Processing Workshops
Food processing workshops must prevent dust and microbial contamination while also controlling odors from the production process (such as cooking fumes in bakery rooms and odors in fermentation rooms). Industrial air filters employ food-grade filter media, such as antimicrobial-treated polyester fiber filters, to prevent secondary contamination of food. In addition, activated carbon filters are widely used in odor treatment, quickly removing odor molecules through the physical adsorption of high iodine value activated carbon.
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