At present, the most widely used in the world is the type II A2 safety cabinet, which can meet the general purpose of the hospital. In addition, it is more economical from the perspective of energy saving. In actual work, many units think that the equipment selection should have a certain degree of advancement, and often choose the B2 type when the A2 type can meet the application, causing many problems. First of all, the exhaust volume of the B2 safety cabinet reaches 1600 cubic meters per hour (the difference is different in different models). The exhaust volume of the ordinary household exhaust fan is about 80 cubic meters per hour. If the room does not have enough supplementary air volume, the safety cabinet cannot work normally. Many laboratories have no choice but to open the door and start up, which does not meet the requirements of the laboratory specifications. In addition, a large amount of indoor air is discharged. To ensure that the temperature in the laboratory meets the experimental requirements, the load of the air conditioner and the heater is very large and has been built. Of laboratories are simply unsatisfactory, which also results in wasted energy. Some units are misled by some so-called "new function" advertisements when choosing safety cabinets. For example, the safety front panel with electric front window is a big mistake. Because the safety cabinet has no dual power supply system, if the power is suddenly cut off, the power window cannot be closed, and the leakage of harmful substances will cause pollution; moreover, regardless of whether it is electric or manual, the operating height is fixed and visible, this electric function is not meaningful Big and harmful. The selection of safety cabinets should mainly be based on the performance of the safety cabinets, such as high-efficiency filters, air path design, alarm devices, negative pressure protection and other indicators, which are better than safety cabinets, and should not be misled by advertising.
Improper selection of biological safety cabinets. According to different structural design, exhaust ratio and protection objects and degree, biological safety cabinets are divided into Class I, Class II and Class III, of which Class II is further divided into Types A2 and B2. Different levels of biosafety laboratories should choose different levels of biosafety cabinets, and can also choose appropriate security cabinets according to different types of protection and protection. When operating a small amount of volatile chemical reagents or radionuclides, you can choose Class II B2 biological safety cabinets; when operating a large amount of volatile chemical reagents or radionuclides, you must use Class II B2 biological safety cabinets.
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Automatic Vacuum Forming Machines
Usually for Thin plastic (0.2-1.5mm) forming,Vacuum forming, commonly known as vacuuforming, is a simplified version of thermoforming.
Automatic Vacuum Forming Machine
Desktop Vacuum Forming Machine,Automatic Vacuum Forming Machine,Automatic Blister Forming Machine,Automatic Seed Tray Vacuum Forming Machine
Hangzhou Xiaoshan Wanfeng Mechanical & Electrical Equipment Factory , https://www.wanfengmachinery.com