Today, the semiconductor industry (chip plant) is the most stringent requirements for the air cleanliness requirements of the production environment, and the requirements for the filter are more demanding. Because the dust on the integrated circuit may cause a break, short circuit, dust directly affect the product's yield. \"Line Width \" is one of the metrics that measures the chip integration, that is, the width of the wire on the circuit on the circuit. In the tendency of the micrometer computed line, it is said that the manufacturing environment on dust particle size is less than one tenth of the wire width. As the line width is constantly being small, 1/10 is said to be 1/4, 1 / 2. In 2002, the line width of the P4 processor in the normal microcomputer was reduced to 0.13 μm, and any dust may damage the circuit at this time. The traditional ventilation form of the chip factory is \"big loop \", full of high-efficiency filters across the entire ceiling, and the entire surface is a return air gate. Many chipplates are now using a self-strap fan filtering device, that is, FFU. The sea salt particles in the air are all electronic workers.
Air filter test counting, mainly used to measure the weight source of accumulated filtration: The test dust source is a large particle size, high concentration of standard dust. Put the filter in a standard experimental wind hole, the upper wind is continuously dust. Every time, the dust collecting the dust on the dust or filter of the filter is measured, whereby the filter is calculated at this stage according to the filter efficiency calculated by the dust. When the agreed final resistance value is reached, the test is terminated when the efficiency is significantly dropped. At this time, the filter is accommodated in the weight of the test dust into \"The amount of dust \". The balance weight efficiency is the weighted average of the experimental stage efficiency according to the dust. Here \"agreement \" refers to the agreement between customers and the trials, or the testor's own regulations. Therefore, the conditions of the termination test are different, and the weight efficiency value is different. The courage method is mainly used to measure low efficiency filters, such as initial filters, genital filters, generally used in the medium-central air conditioning system. DOP method is high
Air filter principle dust and filter media adhesiveness: dust particles in the air, or moving with gas flow, or moves without regular motion, or moves with a certain field force, when the particles in the movement hit the disorder Van der Walsi between particles and obstacles make them stick together. Filtration dielectric material: can effectively intercept the dust particles, and do not form excessive resistance to airflow. Messy interleaved fibers form a number of barriers to the particles, and the spatial space between fibers allows the airflow to pass smoothly. Currently used materials have glass fibers, polypropylene fibers, polyester synthetic fibers, meltblown nonwovens, and the like. According to the movement law of the filter medium with the dust, the common filtering mechanism is divided into inertial principles, proliferation principle, and electrostatic principle. Large particles are inertial in the airflow. The airflow disguise, the dust from the inertia deviates from the airflow direction and hits the obstacle. The greater the particles, the stronger the inertia,
Intake air filter is mainly used for gas cleaning, for removing dust particles therein. In addition, some production processes in the exhaust gas containing fine contaminants (such as radioactive materials, mist, etc.), although such purified exhaust gas purification belongs, because of its high purification requirements, but also requires the use of an air filter. Air filter (Air Filter) refers to the air filter, generally used for clean room, clean rooms, laboratories and clean rooms, electronic or mechanical communication device for dust and the like. Primary filter is divided into, in effect filter, sub-efficient filter and a high efficiency filter models. Various models have different standards and the use of performance. The following is the common specifications table (the part from the network, sharing only learn to share, belongs to original author). Junior high efficiency filter efficiency specifications table
First, the filter classification air filter refers to the apparatus for removing the particulates in the air using filtration, adhesion or tip trap, such that the concentration of particulate matter in the air is lowered to achieve the purpose of purifying air. At present, there are two filter standards in my country. They are: GB / T 13554-2008 High-efficiency air filter GB / T 14295-2019 Air filter is divided into coarse effect, groom filter according to national standard air filters , Efficient (HEPA) and ultra efficient (ULPA) filter. Second, the filter test method 01 counting the filter is installed in a standard test wind hole, the upper wind is continuously dust-proof (generally loened dust), every other period of time, measure the dust quality through the filter, resulting in filtration The filtering efficiency calculated at this stage of dust quality, the test dust particle size range is ≥ 5 μm. 02 colorimetry is sampled before and after the filter, the dust is filtered through the filter paper, will pollution