Clean room cleanliness maintenance to prevent particulate contamination

2019-02-15 10:39:06   Editor: jushong shares    0

In cleanrooms, there are many important factors that determine the generation of particulate contaminants, including human maintenance in cleanrooms. Every member of the clean room should fully understand how much personal hygiene practices affect the cleanliness of the clean room. This is the most important. Following the following principles can prevent the generation of artificial particulate pollutants in the clean room environment.


Personal hygiene


It is very important to maintain personal hygiene. As soon as you walk into the clean room, you should always pay attention to your behavior and avoid bringing unnecessary pollutants and bad habits in daily life into the clean room. When your work needs to be done in a clean room or even into a clean room, you must be accustomed to wearing cotton or polyester-blend casual wear that does not lint. Try not to wear clothes made of nylon or other synthetic fabrics. They are more prone to static electricity and can absorb particles due to static electricity. Do not wear woolen sweaters, scarves or socks.

   When it comes to cosmetics, encourage the use of deodorants. It is best to use a dry, odorless, powder-free brand, such as a tumble-type deodorant, a gel or a stick-like cosmetic. Lip balm is a good example, but it is not recommended to use some lipsticks, rouge, whitefly, eyeshadow, eyebrow pencil, mascara, hair gel, perfume or cologne that are easy to fade or have other residues, because these products will Produce particles or release gases.

   Take a bath and wash your hair every day, which can effectively control dander and dandruff. Try to trim your nails as short as possible. If you have to apply nail polish, use only nail polish that will not fall off, metal and no flash. Do not leave long nails as they may pierce gloves or finger cots.

   Before entering the clean room, wash your hands with specially prepared clean room cleaners and moisturizers to wash away necrotic cells and prevent skin loss. To do this, wash your hands with soap and moisturizer provided by your employer. Those direct-sale, commercially available detergents contain sodium and oil that do not meet the clean room requirements. It is best not to scratch or rub the skin in the clean room, as this type of action may cause the skin to fall off and contaminate the product.

   Before entering the clean room, it is best to comb your hair regularly, and the hair can remove dandruff and hair loss. Wear a fluffy hat, and you must put the hair on your forehead into the hat, everyone must do it. Do not take off your hat in the clean room or locker room, or comb your hair or hair in a clean room or dressing room.

   Do not chew oral sugar and mints in the clean room. But before entering the clean room, drinking a certain amount of water can effectively maintain the body's moisture. A fountain can be installed outside the clean room. Do not bring food and drinks into the clean room. Do not smoke for 15 minutes before entering the clean room to keep the lungs clean.

Clothing and personal items

   As for jewellery, staff can wear wedding and engagement rings, but it is best not to wear sharp-edged or sharp-edged rings as they may pierce gloves or clothing. If you must wear this ring, you need to wrap them around with gloves before wearing gloves and wearing clean clothes. It is recommended not to wear overhang earrings, necklaces, brooches and other protruding or hanging accessories, even if they are generally hidden inside the clothes, it is best not to wear these accessories. Because these things can interfere with the normal activities of the clean room or laboratory.

   Personal items, such as cigarettes, wallets, paper towels, and paper products, are stored in a desk or locker and cannot be brought into the clean room. In the clean room, the pocket of the garment can only be empty, unless specifically authorized by the management. Workers are strongly advised to wear glasses or goggles because every time we rub our eyes, our eyes will expel mucus. Before entering the clean room, first wipe off all visible particulate contaminants on the glasses and goggles.

   Dry dander, exhaled air and saliva can contaminate the product. Masks used by companies are different, but people with beards, mustaches or long beards must wear a beard set. Disposable shoe covers are best replaced one or two times a day. Most locker rooms have a clean side and a polluted side, and clean room personnel should always follow the rules. You can't walk out of the locker room with your shoe cover and walk in with the same pair of shoe covers.

   It is best to wear a fluffy round cap. As mentioned earlier, hair, including bangs, must be completely hidden in the hat and cannot be exposed. The hat can only be removed from the clean room or outside the locker room, and the hat cannot be removed from the clean room. Hats worn in clean rooms or outside the locker room cannot be used again.

   If you use a workwear that can be washed with water or a overalls ("Bonnie"), it is recommended to change it once or twice a week, or as soon as the clothes are dirty. The rules of each company are different in this procedure.

   Always follow the dress code. Clothes must not come into contact with the floor. Contact with the floor can contaminate the clothes. If the cleansing suit does touch the floor, you must immediately replace the clean clean clothes.

   If you need to wear gloves, you must use powder-free latex gloves or vinyl gloves for the clean room. Because some people are allergic to the protein in latex, if you have red spots on your hands due to the use of powder-free latex gloves, you must immediately switch to vinyl gloves. Once the gloves have faded or have holes, they must be replaced immediately, but they cannot be replaced in the clean room. Only gloves can be replaced in the locker room. Do not pull the gloves and remove the gloves, you should slowly remove the gloves from your hands.




Before entering a clean environment, it is recommended to clean the sole with a vacuum pad. The size of the mat depends on the size of the entrance to the door. They are usually placed outside the door of the locker room, inside the locker room and at the entrance to the main clean room. There is no need to place a vacuum mat at the exit of the clean room. Each foot must be stepped on at least twice on the mat. Always replace the mats that hold the dust and place them outside the clean room. Change at least two or three times a day (depending on the flow of people).

   A dedicated high-efficiency particulate air filter vacuum cleaner is recommended and should be cleaned regularly. Vacuum cleaners are available in wet/dry and dry types and are ideal for cleaning out leaking contaminants. Hazardous spills must be handled by trained safety personnel. Walls and ceilings can be dried with a vacuum cleaner.

   It is recommended to use a clean room-specific wipe that meets the clean room grading requirements, whether wet or dry, but the wipes are dirty, broken or worn and need to be disposed of properly. The floor should be mopped once a day with a mop or cleaned once or twice with a vacuum cleaner. (Different companies have different regulations and requirements in this regard.) In clean rooms, only high-efficiency particulate air filter vacuum cleaners or clean room mops with low particle levels can be used.

   It is recommended to use an aqueous solution containing no sodium, potassium, ammonia, iron, copper or nickel. Regularly clean the clean room with a wet mop or rag. Sometimes it may be necessary to use detergents and disinfectants before rinsing with water that meets the clean room requirements, such as distilled or deionized water. If you need to use lubricants, it is best to ask the clean room managers and which lubricants can be used. It is generally recommended to use a low outgassing lubricant. After adding the lubricant, wipe off any residual lubricant on the surface to avoid accumulation of particles on the oil.

   Doors, door frames and sills need to be cleaned regularly. First wipe the top of the door, then wipe the sides and edges of the door. It is best to wipe the door with a pre-soaked wipe. Tables, trolleys and other furniture also need to be cleaned regularly. The furniture should be slowly wiped with a long overlapping brush. When wiping the table or work table, it should be rubbed from the back to the front. Never wipe it quickly or with force, as this can cause disturbances in the clean room air. Also, don't forget to rub the cart and the underside of the table.

   Need to set up an indoor cleaning program or ask outside professionals to do regular cleaning. The frequency of cleaning can be once a day or once a week, depending on the actual requirements. It must be cleaned from the dirtiest side of the clean room, first wipe the ceiling, and then wipe the floor along the wall. Only a small portion can be cleaned at a time and the solution and water should be changed frequently. In addition, additional rinsing may be required, especially if detergent is required. It is not recommended to use force or scrub back and forth. Cleaning the clean room should be repeated as often as possible with a slow, pre-designed straight up and down method.

   Soft vinyl walls or curtains can be wiped with a pre-soaked rag. To rub down from the top of the curtain, wipe it all the way to the floor, then wipe off any water left on the vinyl wall or curtain with a dry rag. Use only a dust-free cloth with a sealing edge. The exterior of the clean room can also be wiped with Simple Green's products and a non-abrasive, lint-free cloth.

   The fixtures also need to be cleaned. To ensure that the wipes and solution do not scratch or corrode the lens, use a wipe to test the position where the lens is not visible before cleaning. A pre-soaked, dust-free wipe is best for this job. Use a long overlapping brush to brush the inside of the fixture from one end to the other, and then clean the exterior of the fixture in the same way.

   The choice of wipes and cleaners is critical when cleaning glass, acrylic or polycarbonate windows. The resin sheet (acrylic or polycarbonate) window may be scratched or cracked during the wiping process. Consult the window manufacturer to find out which chemicals can be used in their windows. A squeegee simplifies cleaning. The handle of the squeegee must be stainless steel or covered with a plastic outer layer. The blade meets low particle shedding. Slowly move down from the top of the window and gently scrape it repeatedly. Since the metal in the old blade may be exposed to scratch the window, always check the blade.

   Ladders and step stools are important tools commonly used in clean rooms, and such products that meet the clean room requirements are commercially available. Do not take wooden or rusty ladders or stools into a functioning clean room. To maintain safe operation, do not stand on a table, chair or cart.

For buckets and dryers for cleaning, the preferred product is a self-aligning wheel device that uses stainless steel or plastic components. Buckets, mops and other cleaning tools must be placed in the designated area of the clean room or locker room, preferably in a dedicated cleaning cabinet designated in this area. After each cleaning, the cleaning tools in the clean room area cannot be taken outside, which may cause cross infection. Workers should be aware that some utensils may contain corroded galvanized parts. Once these vessels begin to corrode, they should be taken out of service immediately and taken out of the clean room.

   If hand tools or other materials are required, a clean room-specific tool should be kept in the clean room area for routine maintenance. Before entering the locker room, these tools should be cleaned with a damp cloth in accordance with the requirements of the clean room. Before entering the clean room, wipe it again in the locker room. All cleaning tools must be cleaned, rinsed and dried to prevent mold and mildew before being placed in the storage cabinet.

Paper and container


In the clean room, only notebooks, paper, folders, and clipboards that meet the requirements of the clean room can be used. Consult the manufacturer when rating the clean room. Check the office equipment and thermal compatibility with the manufacturer before putting the clean room paper into the copier or printer. Some types of paper may melt, leaving residue on the machine drum, causing contamination and possibly destroying the equipment.

   The one-piece ballpoint pen is the ideal clean room pen. Click-type ballpoint pens tend to produce metal particles and plastic particles when the pen tip is retracted. You cannot use a graphite pen (pencil) in a clean room.

   The container (waste bin) containing waste must be stainless steel or a single piece of plastic molded plastic, and a soft plastic garbage bag should be placed in the barrel. When dumping garbage, grab the four corners of the garbage bag and send it to the garbage collection center. Seal the garbage bag and not let the smell of the garbage escape in the clean room. Take the trash can to the locker room and wipe the inside and outside of the trash can every day.

   Various sizes and electrostatic discharge (ESD) plastic boxes, boxes and containers are available in the store, but cardboard or wooden containers cannot be brought into the locker or clean room. These fibrous material containers produce a large amount of particles. If you want to use tape, use only conductive tape or standard tape that meets clean room requirements.

in conclusion 

   Frequent reading and strict adherence to these principles will make them deeply imprinted in the minds of clean room staff. While it is still necessary to monitor and analyze the generation of particulates, these management regimes will help reduce the microparticles produced by human factors in controlling the amount of particulates in critical environments.

Ron Perry is President of RPA, Inc., which provides state-of-the-art cleanroom design, construction, monitoring and indoor equipment. Perry has more than 25 years of experience in the sales of cleanroom products in the semiconductor, aerospace, microelectronics, biomedical and pharmaceutical industries in Southern California.

Workwear (Bonnie) wear step

1. Grab the two cuffs of the overalls with your hand;

2, roll up the overalls trousers, put one foot into the overalls at a time;

3, stand straight, still grab the cuffs of the two sleeves;

4. Loosen one sleeve, put one hand into the sleeve, then release the other sleeve and extend the other hand into the other sleeve;

5, pull on the work clothes zipper, you can start working.

These steps require good training and balance the body. You may need to sit in overalls.

Step of removing the film layer of the suction pad

1. Find the color label on the edge of the mat;

2. Pick up the label and slowly peel off the film layer from the edge of the mat;

3. Continue to peel the film upwards and separate it from the mat until the four corners are separated from the mat;

4. Pull the four corners of the separation into the middle of the mat to form a tent;

5. Slowly separate the film in the middle of the mat;

6. Fold the film inward until it is small enough to be discarded. These steps ensure that dust particles do not leak out of the film. The contaminated film should be thrown outside the locker.

Workers are not free to tear the label and tear the film off the mat. Doing so will allow particles to enter the clean room through the air, so be sure to remove the film slowly.

Yan Hong shares


Guangdong Yuhong Technology Co., Ltd. was established in 2016 by Shenzhen Kebiao, Dongguan Liren and Dongguan Antai, with a registered capital of 100 million yuan. Shenzhen Kebiao Purification Equipment Co., Ltd. was established in 1999. With years of industry accumulation and precipitation, it has developed into a clean room system full industrial chain group company covering three major business segments: material production, equipment production, intelligent control and engineering installation. . In 2018, the group completed a total sales of 700 million yuan.

       The group has 1,062 employees, including 113 R&D and engineering technicians, 249 production, management and sales personnel, and 700 engineering installers. In Shenzhen Nanshan Science and Technology Park, 2200m2 of high-quality office buildings were purchased, and Dongguan Tangxia built 13000m2 industrial park. The professional production of industrial clean industry supporting high-end sheet production capacity of 2 million m2, the annual output of clean equipment FFU reached 50,000 units, and established the first wind tunnel laboratory in South China that meets the US MACA ventilation standards. Fully integrate the clean room industry chain system, set up a group research center, and continuously innovate and develop new products and processes of clean systems. Subsidiary Shenzhen Kebiao has the qualifications of the State Construction Department to award the architectural decoration engineering design B, the architectural decoration and decoration engineering contractor grade, the mechanical and electrical installation and the steel structure. It is the overall builder of the large industrial clean room in China. Professional construction of high-grade industrial clean room and air pressure, vacuum, special gas, ultra-pure gas, process exhaust, pure water, process cooling water, wastewater, electricity, weak electricity, monitoring, fire protection, chemical supply and secondary distribution systems engineering. Future Group will focus on the development, production and sales of clean room construction and supporting materials and products in industrial electronics, flat panel display, precision instruments, biomedicine, medical and health industries.

     "Care on the ground, professional integrity" is the company's business philosophy and core values that have been upheld for 20 years. The company's vision is to grow into the most competitive clean room system in China.