Archive centers, libraries, or museums have a vast collection of archives, books, calligraphy and paintings and other paper cultural relics, which are precious cultural heritage with historical, artistic and scientific value. The durability of paper and writing is an important factor in the life of files and books. Once there are irreversible changes such as paper damage, yellowing, brittle, mildew and handwriting drying, the life of files and books will be seriously affected. The research shows that the aging and deterioration of paper are closely related to its storage environment, preservation materials, paper composition, paper-making process, writing materials and other factors.
With the wide application and development of air-controlled storage technology, nitrogen production technology has been widely used in the field of cultural relic protection. Combined with temperature and humidity monitoring and control technology, ultraviolet protection technology, pest control technology and other modern methods, air-controlled technology can be applied in cultural relics protection at home and abroad. The aim of air-controlled technology is to adjust the proportion and concentration of oxygen and nitrogen, and control the main environmental factors such as temperature and humidity, thereby realizing the preservation of cultural relics. Nitrogen-filled storage technology has a bright future in archives protection because it has the advantage of low cost, safe, and simple operation.
The exhibition needs cultural relics and needs to meet the display and storage of different cultural relics.
33 sets of airtight showcase and one nitrogen display and control system
The oxygen content and humidity parameters of each showcase can be set independently
Using low-reflection glass to ensure the favorable viewing
The showcase is painted according to the style of the exhibition hall
The air channel and cables are perfectly hidden
The design also takes into account the possibility of capacity expansion
Equipment and devices
Air compressor, nitrogen generator and its controller, two sets of nitrogen generator and controller, 33 sets of low oxygen showcase
Air exchange rate: ≤0.02d-1
Oxygen concentration: 2%~15%
Humidity: 30%~65%RH (20℃)
Humidity accuracy: ≤±3%RH
Humidity fluctuation: ≤5%RH
The preventive conversation of different types of cultural relics in the Zhengyangmen exhibition hall
5 sets of airtight cabinets (3m3), using one nitrogen generator and controller
The size of the cabinet is customized
Each cabinet is independent of the others, and parameters can be set and controlled separately to meet the classification and storage of cultural relics with different textures
One set of nitrogen generators and controllers, five sets of low oxygen cabinet
Air exchange rate: ≤0.02d-1
Oxygen concentration: 1%~21%
Humidity: 30%~65%RH (20℃)
Power supply: AC220V/50Hz/2kW
According to the Joint Laboratory of Inspection and Testing of cultural relics protection equipment (Technology Center of Cultural Relics Protection of Shanghai Museum), the air exchange is 0.01d-1, 0.012d-1 respectively, which is 40 times superior to the standard of GB/T 36110-2018《Airtightness and inspection of cultural relics showcase》. In addition, formaldehyde content is zero, VOC≤318ppb, formic acid≤3.25μg/m3, and acetic acid≤47.58μg/m3. The inside pollutant, humidity accuracy, and fluctuation meet the requirement of the GB/T 36111-2018《Airtightness performance and testing of cultural relics showcase》.
