The ultra-clean workbench is a facility that provides a sterile operating environment for laboratory work to protect the experiment from the external environment, while providing a certain degree of protection for the external environment to prevent contamination and protect the operator. To The ultra-clean workbench can be divided into vertical type, inside-out type and lateral type. In terms of operating quality and environmental impact, the vertical type is superior. The clean air provided by the air supply filter plate descends through the operation area at a specific speed, and is divided approximately in the middle of the operation area. It is sucked by the front air suction hole and the rear suction window, and the air sucked in the lower part of the operation area is mixed. Together, they are pumped into the rear positive pressure zone by a blower. In the upper part of the machine, 30% of the gas is discharged from the top through the exhaust filter plate, and about 70% of the gas is reentered into the operating area through the oxygen filter plate. In order to supplement the air discharged from the exhaust port, the same volume of air is replenished from the room air through the operating port. To Instructions for use of ultra-clean workbench 1. Before using the ultra-clean workbench, apply UV light for 30-40 minutes, and check that all openable doors and windows around the operating area are in working positions. The operation is best carried out in the center of the operating area, which is a safer area in design. 2. Before proceeding with the operation, you should have a preliminary understanding of the experimental materials, and understand the performance and safety level of the equipment you are using. Strictly implement laboratory safety regulations. The use of specific pathogens in any ultra-clean bench must undergo a safety assessment. If the experimental material will cause environmental pollution to the surrounding environment, it should be avoided in the model without exhaust filter plate, because operation in flowing air is no different from dispersing poison. 3. Any advanced equipment cannot guarantee the success of the experiment. The ultra-clean workbench of the animal quarantine laboratory is used for the purpose of sterility and avoiding cross-contamination. Therefore, skilled operation and clear aseptic essentials are essential. To The ultra-clean workbench is a relatively sophisticated electrical equipment, and it is very important to maintain and maintain it regularly. To Clean bench maintenance 1. Keep the room dry and clean. Moist air will not only cause corrosion of manufacturing materials, but also affect the normal operation of electrical circuits. Moist air is also conducive to the growth of bacteria and mold. 2. Regular cleaning of equipment is an important part of normal use. A clean environment can also extend the life of the filter plate. Cleaning should include routine cleaning before and after use a...
1. Required cleaning tools and products (1) Vacuum cleaner for clean room (2), clean paper, dust-free cloth (3), deionized water (4), alcohol (5), bucket (6), mop (7), mop bucket 2. Cleaning requirements (1) Clean room dust-free cloth should be used when cleaning the walls in the clean room; (2) Use 90% deionized water and 10% isopropanol to prepare cleaning agent; (3) Use an approved clean room special detergent; (4) Check the trash bins in the workshop and maintenance room every day and clear them away in time. (5) Every floor must be vacuumed. Every time a shift is transferred, the completion of the work should be marked on the map, such as where it ends and where it starts. (6) Special mop should be used to clean the floor of clean room. (7) A special vacuum cleaner with a high efficiency filter should be used for vacuuming in a clean room. (8) All doors need to be checked and wiped dry (9) Wipe the floor after absorbing the floor. Wipe the wall once a week. (10) Vacuum and wipe under the raised floor. (11) Wipe the pillars and supporting pillars under the raised floor once every three months. (12) When working, we must remember to always wipe from top to bottom, from the farthest place to the door. 3. Clean room cleaning procedures (1) Replace the special anti-static clothing, wear a mask, and remove the dust through the air bath dust collection channel before entering the clean room. (2) After preparing cleaning tools and supplies and placing them at the specified location, start cleaning. (3) Pick up ground garbage, one by one from the inside to the outside according to the order of the production line. (4) Dump and transport the garbage in the trash cans and garbage bins on time, and conduct inspections. After strict classification according to regulations, they will be transported to the designated garbage room for classification and placement after inspection by the production line manager or security. (5) Use clean paper or dust-free cloth from top to bottom to clean indoor glass, walls, shelves, (6) Use a clean dust pusher to push dust and clean the ground carefully from the inside out. If there are garbage, stains, water marks on the ground, etc., clean it with a dust-free cloth in time. (7) Clean up the production line, under the workbench, and under the chairs during the rest and dining time of the production line employees. (8). Regularly clean the ceiling, air-conditioning outlet, ceiling lamp cover, and under the raised floor. The cleaning procedures and materials used must be approved by the factory affairs department, and use holidays and work breaks as planned. (9) The floor waxing of the clean room must be carried out in strict accordance with the plan and cleaning procedures, and anti-static wax must be used. (10) After the completion of the cleaning work, all cleaning supplies must be received in the designated cleaning room, and stored separately from ordinary tools to avoid cross-contamination, and placed neatly and not ...
The entire process of the air purification project is relatively complicated and requires the cooperation of all aspects to better ensure the work effect. A little carelessness, as long as there is a problem in one of the links, it is possible that all previous efforts will be abandoned, which will have an adverse effect on the production of the enterprise. Let's analyze specifically what matters need to be paid attention to during the construction of the air purification project. 1. In the air purification project, the air purification treatment of all levels of air cleanliness should adopt three-stage filtration of primary, medium and high efficiency air filters. For 100,000-level air purification treatment, sub-high-efficiency air filters can be used instead of high-efficiency air filters. 2. The selection arrangement and installation method of the air filter shall meet the following requirements: (1) An oil-immersed filter should not be used for the primary air filter. (2) Medium-efficiency air filters should be centrally installed in the positive pressure section of the purified air conditioning system. (3) The high-efficiency air filter or sub-high-efficiency air filter should be installed at the end of the purified air conditioning system. The installation method of the high-efficiency air filter should be simple and reliable, and convenient for leak detection and replacement. (4) Medium efficiency, sub-high efficiency and high efficiency air filters should be selected according to the rated air volume. (5) High-efficiency air filters with similar resistance and efficiency should be installed in the same purification workshop. 3. When determining a centralized or decentralized clean air conditioning system, comprehensive consideration should be given to the characteristics of the production process and the cleanliness level, area, and location of the clean room air. For those clean rooms with continuous production processes, large areas of clean rooms or purification workshops, centralized locations and strict requirements for noise control and vibration control, it is best to use a centralized clean air conditioning system. 4. If electric heating is required for the purified air conditioning system, tubular electric heaters should be used, and the position should be on the windward side of the high efficiency air filter. Fire safety measures should be provided during use. 5. The blower can be selected according to the total air supply volume and total resistance value of the purified air conditioning system. The resistance of medium and high efficiency air filters should be calculated at twice the initial resistance. 6. In the air purification project, the purification air conditioning system should take preventive measures to prevent the outdoor polluted air from infiltrating into the purification workshop through the fresh air outlet in addition to the direct-flow system and the system with the on-duty fan. 7. When designing the clean a...
Clean room refers to the removal of particles, harmful air, bacteria and other pollutants in the air within a certain space, and the control of indoor temperature, cleanliness, indoor pressure, air velocity and air distribution, noise, vibration, lighting, and static electricity Within a certain range of needs, and given a specially designed room. That is, no matter how the external air conditions change, the room can maintain the original set requirements of cleanliness, temperature, humidity, and pressure. The main function of the clean room is to control the cleanliness, temperature and humidity of the atmosphere that the products (such as silicon chips, etc.) contact, so that the products can be produced and manufactured in a good environmental space. This space is called the clean room. 1. Indicators of clean room. 1） The air supply in the clean room is sufficient to dilute or eliminate indoor pollution. 2） The air in the clean room flows from the clean area to the area with poor cleanliness, the flow of contaminated air reaches the minimum, and the air flows in the correct direction at the doorway and in the indoor building. 3） The air supply in the clean room will not significantly increase indoor pollution. 4） The movement state of indoor air can ensure that there is no high concentration gathering area in the secret room. 2. Clean room test. 1. Air supply and exhaust air volume: If it is a turbulent clean room, the air supply and exhaust air volume must be measured. If it is a one-way flow clean room, the wind speed must be measured. 2. Airflow control between areas: To prove that the airflow movement direction between the areas is correct, that is, flow from the clean area to the area with poor cleanliness, it is necessary to check: (1) The pressure difference in each section is correct; (2) The direction of air movement at the doorway or openings on the wall, floor, etc. is correct, that is, it flows from the clean area to the poorly clean area. 3. Filter leak detection: The high-efficiency filter and its frame should be inspected to ensure that suspended pollutants will not pass through: (1) Damaged filter; (2) The gap between the filter and its outer frame; (3) Other parts of the filter device invade the room. 4. Isolation leak detection: This test is to prove that suspended pollutants do not penetrate the building materials into the clean room. 5. Indoor airflow control: The type of airflow control test depends on the airflow pattern of the clean room-turbulent flow or unidirectional flow. If the airflow in the clean room is turbulent, it must be verified that there is no area with insufficient airflow in the room. If it is a one-way flow clean room, it must be verified that the wind speed and direction of the entire room meet the design requirements. 6. Suspended particle concentration and microbial concentration: If the above tests meet the requirements, the particle concentration and microbial concentration (when necessary) are f...
With the rapid development of social economy, especially the scientific experiment and high-tech production process represented by microelectronics, bioengineering, and precision machining, the precision, miniaturization, high purity, high quality and high reliability of product processing Put forward higher requirements. The indoor production environment is not only related to the health and comfort of the employees in the production activities, but also related to the production efficiency, product quality, and even the important issues of whether the production process can be carried out. Clean room + concludes that the influence of the indoor environment on the production process is as follows： (1) Have an important impact on the production process Indoor production environment is one of the key factors that restrict industrial production, especially high-tech production. For example, in the chip production process of the microelectronics industry, the control of particles must reach the molecular level, otherwise the production cannot be carried out, or the production of defective products; in the production environment of antibiotics, if certain microorganisms exist, the production cannot be normal get on. (2) Affect production efficiency The impact of the indoor production environment on production efficiency is reflected in the following two aspects: First, a good production environment can not only guarantee the physical and mental health and attendance of production personnel, but also improve their working mood and enthusiasm; secondly, a good production environment can guarantee The smooth progress of production improves the yield of products. (3) Affect product quality Indoor production environment is one of the important factors affecting product quality. For example, products such as photographic films, integrated circuits, chemical reagents, precision instruments and micro motors, if they are contaminated by dust, will reduce their quality or even be scrapped; in the food processing industry, the presence of microorganisms will shorten the shelf life and reduce product quality. (4) Cause environmental pollution As we all know, environmental pollution is mainly caused by industrial pollution. Among them, air pollution and water pollution affect people's health on the one hand, and also affect the production process and product quality on the other. Therefore, in order to reduce the impact of indoor pollution on the production process, clean technology must be used to improve or solve the problem of indoor pollution. To be sure, it is completely impossible to control the concentration of suspended particles in the entire microenvironment in an ordinary production workshop to achieve the cleanliness required by the process. Only by constructing a clean room, adopting a closed structure, reasonable airflow organization and reasonable pressure difference, can the microenvironment achieve the required air cleanliness and meet the produc...
The cleanliness of a clean room is often affected by airflow. In other words, the movement and diffusion of dust produced by people, machine compartments, and building structures are dominated by airflow. The clean room uses HEPA and ULPA to filter the air, and its dust collection rate is as much as 99.97~99.99995%, so the air filtered by this filter can be said to be very clean. However, in addition to people, there are sources of dust in the clean room, such as machines. Once the generated dust spreads, the clean space cannot be maintained. Therefore, airflow must be used to quickly discharge the generated dust outside. Wind speed control The airflow in the clean room is an important factor affecting the performance of the clean room. Generally, the airflow speed of the clean room is selected between 0.25~0.5m/s. This airflow speed belongs to the breeze area, which is susceptible to interference by people, machines, etc. and tends to be chaotic. , Although increasing the wind speed can suppress the influence of this disturbance and maintain cleanliness, the increase in wind speed will affect the increase in operating costs. Therefore, it should be able to supply at the most appropriate wind speed when the required cleanliness level is met. Achieve appropriate wind speed supply to achieve economic results. On the other hand, in order to achieve a stable effect of clean room cleanliness, the maintenance of uniform airflow is also an important factor. If uniform airflow cannot be maintained, it means that the wind speed is different. Especially on the wall, the airflow will generate vortex along the wall. Achieving high cleanliness is actually very difficult. To maintain a uniform air flow in the vertical laminar flow direction, it must be: (A) There must be no difference in speed in the wind speed on the blowing surface; (B) There should be no difference in the wind speed on the suction surface of the floor return air plate. If the speed is too low or too high (0.2m/s, 0.7m/s), there will be eddy currents. At a speed of 0.5m/s, the airflow is more uniform. Generally, the wind speed of a clean room is 0.25~0.5m. /s between. Influencing factors There are many airflow factors that affect the clean room, such as process equipment, personnel,clean room assembly materials, lighting appliances, etc. At the same time, the diversion point of the airflow above the production equipment should also be considered. Generally, the air flow diversion point on the surface of the operating table or production equipment should be located at the distance between the clean room space and the clean room partition wall 2/3, so that the air flow can flow from the inside of the process area to the work area when the operator is working. The dust is taken away; if the diversion point is placed in front of the process area, it will become an improper air flow diversion. At this time, most of the air flow will flow to the process area, and the dust caused by the opera...
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