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Industrial dehumidification, moistureproof, mildew proof and anti oxidation knowledge
Dec 21, 2017

For a long time, people have been trying to find effective means of damp proof and anti - mould change and corrosion prevention, in order to solve the problem of safety and preservation of goods. In order to control the water content of the environment and control the relative humidity of the environment to about 50%, the safety of most of the items can be ensured. In order to achieve this goal, people have adopted a variety of drying methods. There are three main kinds of traditional methods, namely, high temperature dehumidifier, low temperature dehumidifier and moisture absorbing agent, three ways.

1. The way of dehumidification and moisture-proof:

1, high temperature dehumidification way: high temperature dehumidification mainly uses the heating method to bake and dehumidification, such as all kinds of electric heating and far infrared drying box, oven and so on. Due to the high working temperature, it will destroy the articles made of organic materials. At the same time, it will also produce heat treatment effect on metal materials, change the properties of metal and cause damage. And the long-term continuous heating is unrealistic. Therefore, as a long-term safe preservation item, the method of high temperature dehumidification is not used.

2, low temperature dehumidification way: low temperature dehumidification mainly uses refrigeration refrigeration dehumidification, and its working principle is to reduce condenser surface temperature by refrigerating device, so that water in air condenses and condenses and condenses and condenses, and then drops out. In this way, the moisture in the air of the sealed space is discharged to reduce the humidity, and it belongs to the dehumidification at low temperature. Freezing dehumidification is the most effective, safest and most economical method of dehumidification at present.

3, vacuum drying method: use the air in the drying cabinet to evacuated to achieve the purpose of removing water. It is made up of a box and a vacuum pump. As a result of vacuum, the pressure and sealing of the box and door are very high. Compared with the outer size of the box, the internal effective use space is small. And can only be realized in a small cabinet, required decompression, inconvenient use, purchase cost. The scope of application is very small.

4, moisture absorption agent dehumidification method: generally in the sealed container of silica gel for dehumidification. The disadvantage is that the hygroscopic agent is saturated to change or artificial drying regeneration, the maintenance work is very complex and protracted Months and years pass by.; more importantly, due to the hygroscopic agent is not easy to accurately predict the saturation time, how much is the humidity inside the container cannot depend on the degree of discoloration is silica gel rather than exact that can not be timely and appropriate the replacement of moisture absorption agent.

Two, the occurrence and harm of mould:

1 kinds of mould and mould the occurrence of various abnormal, they include fungi in Ascomycetes, Phycomycetes and Deuteromycetes, which have invasion effects on industrial materials have 40000 kinds. The spread of mould is mainly dependent on spores, and the spores are small powder, and the naked eye is not easy to observe. The spore ejected from the mold. Because of its small size and light weight, it floated with the movement of air flow and dust, as well as the movement of the body and body. But when a suitable development environment, can be growth, reproduction, it is often said that the mildew.

2, the condition of long moulds 1), humidity: the relative humidity of the environment is greater than the 60% mold. When the growth is more than RH 65%, the growth speed is faster and the humidity reaches RH80-95%, it is the high incidence environment of mould. 2), temperature: mold mycelium can grow at ambient temperature above 8 degrees, and grow faster than 12 degrees. When the temperature is above 10 degrees and humidity is above 60%, mold can cause harm to products. When the temperature is 20-35 degrees and the humidity is at 75-95%, the mold can be explosively grown.

3. The process of oxidation corrosion of metal and the oxidation corrosion of metal is the process of electrochemical reaction caused by water and oxygen in the air. Scientific research has proved that the critical value of air relative humidity for metal oxidation corrosion is 70%, copper is 60%, aluminum is 76%, iron is 63%, and zinc is 60%. In the environment where the metal is stored above the critical value, the speed of oxidation corrosion is accelerated with the increase of the relative humidity of the air.

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