With the development of society and economy, a large number of industrial plants in our country have been dismantled or idle because of the loss of production function. If dismantling and use value old industrial plants will inevitably lead to waste, so the traditional way of reconstructing old industrial buildings can not blindly go waste and removal of waste resources and pollute the environment, and deal with the long service life and has the use value of the transformation of the old industry building a resource-saving in space, to avoid environmental problems after the transformation, can produce good economic and ecological benefits. Making full use of the original resources to achieve the purpose of saving investment and reducing the loss of social wealth is the great significance of the renovation and renovation of old factories, reducing the loss of social wealth, and its significance and value in sustainable development and ecosystem is beyond measure.
Although the old industrial building has not been able to keep pace with the times in function, its main structure can also be used for a long time. If demolition or reconstruction is done, it will inevitably lead to waste of resources. Therefore, excavating the adaptability potential of old industrial buildings to transform and reuse can save the funds for re construction, and also greatly reduce the construction cycle. To the effect of "turning waste into treasure", it has a very significant economic significance.
为了降低洁净室的建造初投资和运行能耗，电子工厂的高级别洁净室一般把ISO 1级～ISO 5级这样高净化级别的垂直单向流用在工艺生产重要、关键的部位，用大面积的非单向流(ISO 6级～ISO 8级)替代大面积的单向流，也就是把垂直单向流与非单向流组合在一个洁净室内，构成混合流洁净室。
In order to build a clean room to reduce the initial investment and operation cost, the electronic factory senior cleanroom general ISO 1 ~ ISO 5 level of such a high level of purifying the vertical unidirectional flow in the production process of the most important and key parts of the non unidirectional large area (ISO 6 ~ ISO 8) instead of unidirectional flow in large area, which is the vertical unidirectional flow and non unidirectional flow in a clean room, a mixed flow clean room.
After years of development, the design, production and sales of integrated circuit industry in China have made great progress and development. Technology of China's IC manufacturing industry has entered the international mainstream of the field, design and packaging technology close to the international level, chip manufacturing technology from 0.35 m to 0.18 m and 0.13 m, while the development of a number of independent intellectual property rights "Chinese core", such as ark, godson, patriot, starlight net, core, Spreadtrum etc.. At present, our country has been built on behalf of the international leading technology 12 inch integrated circuit production line, and the emergence of the production line, with the improvement of the technology level of production, environmental cleanliness requirements are increasingly high, while high cleanliness mainly rely on clean workshop and its clean air conditioning system to achieve.