How to clean the walls and floors of clean rooms

Cleaning the walls and floors of clean rooms is an important part of keeping the environment dust-free and pollution-free. This article will systematically analyze the cleaning and disinfection methods, cleaning frequency, and cleaning and disinfection methods of clean rooms, and combine relevant standards and data to ensure that the operation of clean rooms meets industry requirements.

I. Cleaning and disinfection methods

1. Dust-free mop and purified water cleaning

Dust-free mops are indispensable tools in the clean room cleaning process. Using purified water for cleaning can effectively remove surface pollutants. The conductivity of purified water should be less than 0.1 µS/cm to ensure its cleanliness. When using a dust-free mop, first soak the mop head with purified water, and then gently wipe the walls and floors. According to statistics, after cleaning with purified water, the number of microorganisms on the surface can be reduced to 10% of the original.

In actual operation, it is recommended to adopt the principle that each mop head should not clean more than 10 square meters of area, so as to avoid cross contamination. In addition, the mop should be kept slightly moist during the cleaning process to avoid residual water stains. After cleaning, the mop head should be immediately rinsed with purified water and dried to ensure that there is no contamination during the next cleaning.

2. Cleaning with dust-free mop and 75% alcohol

75% alcohol is an effective disinfectant that can quickly kill a variety of bacteria and viruses. It is recommended to replace the disinfectant every three months to ensure its effectiveness. When cleaning, first soak the dust-free mop head in 75% alcohol, and after it is fully absorbed, clean the walls and floors.

When using alcohol for cleaning, pay attention to the concentration and amount of detergent used. It is usually recommended to use about 50 ml of alcohol per square meter of cleaning area to ensure the disinfection effect. According to the ISO 14644-5 standard, the surface after cleaning should be kept dry to avoid water stains caused by alcohol residue. After cleaning, the surface needs to be allowed to dry naturally to ensure the maximum sterilization effect.

3. Cleaning with dry dust-free mop

Dry dust-free mop is another important tool in the cleaning process, suitable for daily maintenance and dust removal. Dry mops are used more frequently, especially when there are fewer production tasks, which can effectively reduce dust accumulation. It is recommended to use dry dust-free mops to clean Walls and floors 1-2 times a week.

During operation, the dry mop should be slid on the surface in a gentle manner, avoiding excessive pressure to prevent scratching the surface. In addition, the frequency of cleaning should also be linked to the production tasks. When there are production tasks, it can be cleaned once a day; when there are no production tasks, it is recommended to clean twice a week. According to the actual situation, check the cleanliness of the mop regularly to ensure that the cleaning effect is not affected by the dirtiness of the tool.

II. Cleaning frequency

1. Cleaning during production tasks

During the production tasks, the cleaning frequency of the clean room should be strictly controlled to once a day. At this time, there are relatively more pollutants on the walls and floors, and the accumulation of microorganisms and dust may affect product quality. Therefore, it is recommended to arrange the cleaning work after the end of production to ensure that the cleaning and disinfection are completed before the start of production the next day.

In order to quantify the cleaning effect, monitoring indicators can be set, such as the microbial count after daily cleaning should be less than 100 CFU/m². Through regular Environmental monitoring and data recording, ensure that the clean room is always kept within the specified clean level during production.

2. Cleaning during non-production tasks

During non-production tasks, the cleaning frequency of the modular clean room is recommended to be adjusted to twice a week. At this time, although there are relatively few pollutants, the environment still needs to be kept clean to prevent potential pollution risks. According to statistics, the increase rate of dust and microorganisms in clean rooms without production activities is about 50% of that in normal production.

When cleaning, it is still necessary to follow the principle of "top-down" to ensure thorough cleaning. For cleaning walls and floors, dust-free mops can also be used with purified water to ensure that dust-free standards are met after each cleaning.

3. Cleaning records and monitoring

In order to ensure the cleaning effect of the clean room and follow the cleaning frequency, it is essential to establish a detailed cleaning record and monitoring system. It is recommended that after the cleaning is completed, the date, time, cleaning staff, cleaning tools and disinfectants used for each cleaning, as well as the results of environmental monitoring after cleaning, should be recorded. These data not only help track cleaning results, but also quickly locate the cause when problems arise.

Cleaning records can be managed using spreadsheets or dedicated software to ensure real-time updating and archiving of information. According to the iso 14644-1 standard, clean rooms should be regularly monitored for environmental monitoring, and it is recommended to conduct comprehensive microbial and particulate matter testing at least once a month to evaluate the overall cleaning effect. The monitoring results should be combined with cleaning records to form a complete quality management system.

III. Cleaning and disinfection methods

1. Cleaning standards and requirements

The cleaning and disinfection standards of clean rooms should meet the requirements of "dry, clean, dust-free, water-free, stain-free, and damage-free". For Class 10,000 clean rooms, it is recommended to adopt more stringent standards to ensure that all surfaces meet the standard requirements after cleaning. Before cleaning, the layout and materials of the clean room should be fully evaluated to determine the cleaning needs of each area.

For Class 10,000 clean rooms, it is recommended to use a combination of microbial monitoring and particulate matter testing to ensure the cleanliness of the environment. The monitoring indicators should comply with the definition of clean room in ISO 14644-1, ensuring that no more than 3,500 particles (≥0.5μm) per cubic meter in the air. According to the actual monitoring results, the cleaning plan should be adjusted in time to achieve higher cleanliness standards.

2. Detail control during cleaning

Detail control is the key to ensuring the effect during the cleaning process. For example, the status of all cleaning tools should be checked before cleaning to ensure the effectiveness of dust-free mops and disinfectants. Cross-contamination should be avoided during cleaning, and it is recommended to use different mop heads and detergents to treat walls and floors respectively.

In addition, the cleaning sequence should also follow the principle of "from top to bottom, from inside to outside" to reduce the risk of secondary contamination. When cleaning the wall, it is recommended to use an alternating up and down technique to ensure that every corner can be cleaned. When cleaning the floor, special attention should be paid to gaps and corners where dust is easily accumulated to ensure that nothing is missed.

3. Environmental assessment after cleaning

After cleaning, an environmental assessment is required to confirm the cleaning effect. It can be evaluated by microbial testing, particulate matter monitoring, etc. According to iso 14644-2, it is recommended to conduct environmental monitoring within 48 hours after cleaning to evaluate the effect of cleaning. The microbial count should be less than 100 CFU/m², and the particle concentration should meet the standard requirements of the modular clean room.

If the evaluation results do not meet the standards, the reasons should be analyzed immediately, which may be caused by factors such as the effectiveness of the cleaning agent, insufficient cleaning frequency, or improper cleaning methods. By analyzing the evaluation results, the cleaning plan can be adjusted in time to ensure that the Clean room environment continues to meet industry standards.

The cleaning of the walls and floors of the clean room is an important part of ensuring product quality and safety. Through scientific cleaning and disinfection methods, reasonable cleaning frequency, and strict cleaning and disinfection methods, the Environmental standards of the clean room can be effectively maintained. In actual operation, quantitative management combined with mathematical models and relevant standards to ensure that each link can achieve the expected results is an important part of clean room management.

By establishing a complete record and monitoring system, timely evaluating the cleaning effect, and continuously improving the cleaning process, a strong guarantee can be provided for the long-term stable operation of the clean room. It is hoped that the analysis and suggestions in this article can provide an effective reference for clean room managers to ensure the safety and cleanliness of the clean room environment.