A protective focus

  For a long time, people have been working hard to seek the moisture-proof anti-mold and anti-corrosion change effective means to solve the problem of preserving the safety items. From the mold growth conditions can be seen, vulnerable to fungal invasion items effective protection is to destroy fungi living conditions, forthcoming articles stored in 60% relative humidity, or the temperature below 10 ¡ã C environment, to help prevent the growth of mold and damage. Due to prolonged high energy temperature control, operation is very economic, therefore focus will fall on the defense to control air onto the water.

  For dehumidifiers.com.cn/News/HumidityConcept/" target="_blank">oxidation corrosion, the removal of oxygen in the air is very difficult and not practical. So protection will surely be the focus fell on the control of water. Scientific studies prove that to metal corrosion occurred in the critical value of the environment, the corrosion rate is slowed down. Environmental humidity dropping more, the greater the corrosion rate relief, such as storage environment relative humidity to 30%. due to low humidity electrochemical corrosion process can not be carried out, the corrosion of metals can be completely stopped.

  So, to control the water environment, focusing on relative humidity of the environment in control of about 40%, it can guarantee the majority of the items stored security. To achieve this goal, people use a variety of drying methods. Traditional methods have the following three major, high temperature, low temperature and moisture absorption agent dehumidification three ways

2, the high temperature dehumidifier way

3, low temperature dehumidifier way

Low temperature dehumidifier is mainly used for refrigeration-type dehumidifiers.com.cn" target="_blank">dehumidifiers (including air conditioners and refrigeration semiconductor) desiccant cooling, The working principle is cooling device to reduce the surface temperature of the condenser, air and the moisture condensing on the condenser condensation, then onto excluded. Dehumidifier manually pouring water and the water dripping from air conditioners, is the reason. Where this way will be sealed air space from the water to reduce humidity, it is low temperature dehumidifier. In this way the main drawback is : Lowers seasonal effect of temperature, 30 ¡ã C degrees higher efficiency, as the temperature decreases, on the efficiency drastically reduced, the 25 ¡æ dehumidification effect obviously deteriorated, 15 ¡ã C below freezing due to the condenser, can not be discharged under water droplets so difficult to dehumidification. -15 ¡ã C and 10 ¡ã C is suitable for mold growth. So low temperature dehumidifier apply mainly to a small number of annual high temperature of countries and regions for other countries and regions for the anti-mold, one year only in a limited effective months, other safety most of the time is still not high, and dehumidifiers.com.cn/News/HumidityConcept/" target="_blank">oxidation resistant to moisture-proof. were ineffective. Secondly, the acquisition cost, power consumption huge, high operating costs. Because of its environmental temperature lower than ambient temperature when removed from the articles, the optical lens, precision instruments, high brightness metal condensation formed on the surface of the water, if not promptly erased it may cause losses. Running out of the water will have to deal with. Moreover, the depth of desiccant difficult. You can not charged space purification of harmful industrial emissions, adapt photographic film, magnetic recording materials to preserve the environment air quality requirements of the items preserved. But in the absence of a more effective, safer and more economical means of Proton's conditions, also be considered a last resort for dehumidification approach.

In recent years the market emergence of a semiconductor refrigeration unit "Pardo stickers" effect will air for moisture condensation excluded Dehumidify Cabinet, as refrigeration electronic automatic Dehumidify Cabinet. Since these products are still refrigeration-type dehumidifiers.com.cn" target="_blank">dehumidifiers, there are also traditional desiccant cooling mode of all defects. Therefore limit its scope of application.

3, vacuum drying method

Use of dry air inside the vacuum for removal of water to achieve the purpose. From the box and vacuum form. As the vacuum, and the box door withstand atmospheric pressure and sealed demanding, and the external box size than efficient use of internal space. And only in small ellipses within, when required decompression, inconvenient, expensive acquisition. Applications should be minimal.

4, moisture absorption agent dehumidification mode

4 is generally in the sealed container for silica gel desiccant placed. When moisture absorption drawback is the need for replacement of saturated or artificial drying for regeneration, After years of protracted maintenance work entails; More importantly, As for saturated moisture absorption difficult to accurately foresee the time, containers What is the humidity also can not rely on it is not the exact degree of color silica know, in a timely manner so as not appropriate for the replacement of moisture absorption. In addition, the so-called relative humidity, refers to the specific space within a certain volume of water equivalent to the air pressure and temperature at that time of the formation of air humidity values. As the air inside sealed containers and isolated from the outside air, the air inside containers absolute water content not decrease or increase, dehumidifiers.com.cn/News/HumidityConcept/" target="_blank">Moisture content of containers to be fixed, and the relative humidity within the container due to the outside temperature and air pressure movements, Humidity will happen movements. Therefore, to a certain temperature and pressure conditions of moisture absorption agent of the use of certain conditions, Because security can not be preserved by the requirements of quantitative control humidity, air containers will not dry also possible the high humidity, or even result in container wall arose water. In addition, when new moisture absorption agent Add containers, put moisture absorption due to the amount hard to grasp, and too little humidity does not drop down, there will be too many of the low humidity, it may cause some storage hazards, In case of the camera electronic device camera IC electrostatic breakdown of organic components cracking open plastic, static photographic films such as Twiggy netted. And when used for a period of time, can not be accurately projected due to the timely replacement, it would give rise to excessive humidity. containers humidity instability, adverse to storage. Because of the above reasons, the use of agents to preserve moisture absorption materials safety is not high. According to the camera kept extensive survey data, Mold lens of the camera in fact the vast majority are used to absorb moisture agent for safekeeping. In addition, the only way such a small space for containers to preserve, it is not appropriate to keep a large number of items, the application is limited. And moisture absorption has been used for drying process more demanding, in the 105-115 ¡æ with baking, master well as temperature, not too low drying, moisture absorption damage will be too high for the change indicator, it lost, no instructions. It is also inappropriate for the large volume of ellipses or rooms and the use of the Treasury.

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Edit by Frank at 2007-5-11 11:13:35