Archives are places where important objects such as documents, materials, cultural relics, ancient books and evidence are stored. According to the "Interim Provisions for the Management of Temperature and Humidity in Archives" issued by the National Archives Administration on November 23, 1985, the notice "National File issued [1985] No. 42" - the temperature and humidity of the archive warehouse is required to be 14 ~ 24 ° C, the relative humidity is 45% ~ 60%, the heating warehouse temperature is not less than 14 ° C, and the humidity is not less than 45%; Summer temperature is not more than 24℃, humidity is not more than 60%. And within the specified range, the temperature fluctuation deviation value is not more than 2℃, and the humidity fluctuation deviation value is not more than 5%.

The reason why the archive should be made into a constant temperature and humidity environment is that the paper products are very thin, relatively fragile, and very easy to damage, and the paper products can only be preserved for a long time in a constant temperature and humidity warehouse.

Paper products have very high temperature and humidity requirements.

If the storage environment temperature is too high, the acidic substances contained in the paper will destroy the fiber structure of the paper, resulting in yellow and discolored paper.

If the storage environment temperature is too low, the paper will be frozen and lead to the contraction of the fiber structure, which will eventually break the fiber structure.

If the humidity of the storage environment is too high, the paper will be damp due to the absorption of moisture in the air, the paper will swell, the handwriting will become more and more blurred, and the paper may be moldy in a high humidity environment for a long time.

If the humidity of the storage environment is too low, the moisture in the paper will gradually volatilize, the paper will become brittle, and the paper that has lost its toughness is easy to damage.

In addition to the temperature and humidity must be controlled within a certain range, while the fluctuation value of temperature and humidity can not be too large, large fluctuations in temperature and humidity will make the fiber structure in the paper under the action of stress is constantly torn, and finally lead to the paper is very fragile, affecting the storage life of the paper.

The archives constant temperature and humidity machine is specially designed to maintain the constant temperature and humidity in the archives. The constant temperature and humidity machine has four functions: heating, cooling, humidification and dehumidification, mainly: compressor, electrode humidifier, fan, electric heater, evaporator, condenser, filter dryer, capillary, expansion valve, temperature and humidity sensor and other components. The constant temperature and humidity machine has a set of advanced constant temperature and humidity control system, the control system can accurately control the operating state of each component, under the comprehensive action of each component, the constant temperature and humidity machine can make the temperature and humidity of the entire archive warehouse remain constant.

In addition to the storage of paper, the archive will also store a certain amount of film, audio products, tapes, electronic U disks, compact discs, silk products, wood products, etc. These items also have optimal temperature and humidity for storage.

1. The best storage temperature of film, copy film, U disk, CD and master film is 13 ~ 15℃, and the best storage humidity is 35% ~ 45%

2. The temperature and humidity of the computer room requires the temperature of 18 ~ 28℃ and the phase humidity of 40% ~ 60%.

3. The temperature and humidity requirements of other technical rooms: the best temperature is 18 ~ 28℃, the best humidity is 50% ~ 70%; The best temperature of photocopying products is 18 ~ 28℃, the best humidity is 50% ~ 65%; The best temperature of audio and video products is 20 ~ 25℃, and the best humidity is 50% ~ 60%. The optimal temperature of the tape library is 14 to 24 ° C and the humidity is 40% to 60%.