Views: 3 Author: Site Editor Publish Time: 2022-10-14 Origin: Site
The clean room should not only use a clean cloth, but also choose a clean cloth corresponding to the purification level. Class 100 clean room can only use Class 100 clean cloth. The clean cloth is double-woven from 100% polyester fiber. The fiber diameter is very small, so it is very soft to the touch, easy to wipe sensitive surfaces, and the fibers will not be rubbed off. It has good water absorption and cleaning efficiency. Therefore, the application field of dust-free cloth is very wide, and the dust-free cloth can be used repeatedly after being properly cleaned. What standards do the clean cloths in the clean room need to meet? In fact, the clean cloth of the clean room is mainly considered and judged from two levels: The first level: functionality, refers to the physical properties of the dust-free cloth. The main items to pay attention to include gram weight, water absorption, water absorption rate, etc. They are all measures of the water absorption of the clean cloth when it is in use. However, the amount of water absorption ensures that the wipe surface can be wetted. Excessive water absorption will leave water spots on the wiping path, causing secondary pollution. The second level: cleanliness, refers to the degree of control of pollutants by the dust-free cloth. Mainly include: non-volatile residue (NVR); anion and cation content and heavy metals; particle count (wet method) LPC. It is an indicator to ensure that the clean cloth will not introduce contaminants into the body to be wiped. Different from the Hemke roller test particle number index commonly used in clean clothes, because the clean cloth is used by wet method, the wet method particle number LPC is more representative and convincing. The above indicators will be tested and reported data. This is the common third-party SGS (Societe Generale deSurveillance S.A.) test report issued by Standard Technical Services Co., Ltd. In addition, the cutting process of the clean cloth is also an important part that affects whether the clean cloth produces dust in the clean room. The cutting process of the clean cloth can be divided into: cold cutting, laser cutting, ultrasonic cutting, hot wire cutting Edge banding. 1.Cold Cut The cold cutting process mainly cuts the fabric according to customer needs through the action of physical shearing force. Due to the lack of edge-sealing treatment, it is easy to generate dander at the cutting place, which will lead to a large amount of cloth waste during the wiping process. The cutting cost is low, the price is low, and it is suitable for the low-demand 10,000-level and general control areas.
2.Laser edge sealing is to use the focused high-power density laser beam to irradiate the clean cloth, so that the irradiated clean cloth is rapidly melted, vaporized, ablated or reaches the ignition point, and at the same time, the molten material is blown away by the high-speed airflow coaxial with the beam. In this way, the clean cloth is cut and the edge fibers are melted. The advantages are firm edge sealing and high cleanliness, which can meet the needs of most wiping applications.
3.When using ultrasonic technology for cutting, the front and rear vibration generated by the ultrasonic vibrator installed behind the main shaft is transmitted to the outer part of the grinding wheel blade through the main shaft and the base of the grinding wheel blade, and converted into expansion movement in the radial direction. Through this vibration conversion method, the tool squeezes and cuts the clean cloth. Ultrasonic edge sealing is divided into ultrasonic narrow edge sealing and ultrasonic wide edge sealing. This edge-sealing process has soft edges, but because the edge-sealing cannot withstand too much tension and the cleanliness is slightly worse than that of laser edge-sealing, it is only suitable for small-size applications that are unfavorable for folding.
4.Use the heating wire to heat and cut the clean cloth at a high temperature, so that the cut clean cloth can be melted quickly, so that the edge fibers of the clean cloth can be melted. This sealing edge is firm and soft, no yellow edge, no hard edge, firm edge, not easy to chip. The cleanliness of the product is excellent, and it is suitable for the use of rolled cloth edge sealing with extremely high cleanliness requirements.
All in all, a clean cloth is an essential part of a clean room. The performance of the clean cloth is not only related to its own material, but also related to the later maintenance density.