Several common problems of dry ice cleaning

Dry ice cleaning can also be called dry ice spray cleaning, carbon dioxide cleaning or low temperature cleaning. The characteristics of dry ice cleaning technology determine its difference from other cleaning processes. The biggest benefit is that the dry ice cleaning solution provided to customers has the characteristics of applicability, environmental protection, practicability, economy and safety.

1. Scope of application of dry ice cleaning technology?

Dry ice cleaning technology usually uses a dry ice machine (dry ice machine, ice machine, dry ice granulator, dry ice granulator, dry ice granulator) to determine the specifications of dry ice particles, and then use a dry ice washing machine (dry ice spray, dry ice spray, Dry ice blasting, dry ice blast cleaning machine, dry ice cleaning mold machine, dry ice mold cleaning machine) compressed air and dry ice particles have a certain pressure. After stirring, it is sprayed on the surface of the cleaned material, and the impulse generated by the dry ice particles at low temperature and high speed causes the dirt to crack.

Therefore, it belongs to the "physical cleaning method". Therefore, in theory, dry ice cleaning technology can replace traditional physical cleaning technology, such as sandblasting, water spraying, wiping and other technologies.

From the industrial practical point of view, the application of dry ice cleaning technology is related to national environmental awareness and legal requirements. That is to say, in the case that the traditional process cannot meet the environmental protection conditions, dry ice cleaning technology can replace the traditional cleaning process. From the process point of view, the principle of any cleaning process is to ensure that the workpiece to be cleaned is not damaged and to ensure the integrity of the workpiece. The dry ice cleaning process must also follow this principle. Dry ice cleaning sprays dry ice particles onto the surface of the workpiece. The surface of the workpiece must bear a certain amount of wind pressure. If the surface of the workpiece cannot withstand a certain amount of wind pressure, the dry ice cleaning process cannot be used.

Dry ice cleaning is widely used in military industry, nuclear energy, metallurgy, casting, petroleum, chemical industry, rubber, plastics, ships, automobiles, food, medicine, machinery, printing, power, electronics and other fields.

2. What is the cost of dry ice cleaning?

Whether the dry ice cleaning technology can replace the traditional cleaning process is the key issue of the process cost, which must be related to the consumption, air pressure, displacement and the resulting cost of dry ice. However, the process cost of any cleaning process is directly related to the original state of the material being cleaned and the cleaning accuracy. Different cleaning accuracy requirements and different cleaning conditions will cause huge differences in costs.

The raw materials of the dry ice cleaning process are mainly dry ice and compressed air. The source of compressed air is inexhaustible and does not require transportation, so there is no purchase and transportation cost of raw materials. The cost of dry ice is basically 3 tons of liquid carbon dioxide can produce 1 ton of qualified dry ice, so the cost of dry ice can be calculated.

The consumption of dry ice is a matter of great concern to users. In fact, the consumption of dry ice is closely related to the cleaning conditions and accuracy. The oil stain is very thick and the adhesion is greater, such as paint, scale, carbon deposition, welding slag and others must be deeply frozen and deleted to effectively affect the gap cracking layer by layer and separated layer by layer, so ice consumption will inevitably increase, The corresponding air pressure requirements are high, and the cost will increase accordingly. However, for oil stains with low adhesion, strong compressed air is not required. It can be cleaned with low pressure. The corresponding dry ice consumes less and costs less.

3. Where are the removals from dry ice cleaning?

For the final destination of the material to be removed, since dry ice cleaning is a physical cleaning, in principle, the material to be removed will only peel off the object, and will not disappear. Therefore, it is "existing". So, where did it migrate? In fact, dry ice will freeze the washed material and form cracks. When the dry ice expands in the cracks, the instantaneous blast causes the cleaned material to form particles. With the diffusion of compressed air, the particles are peeled off and diffused into the air. Of course, after cleaning, if there are no other measures, the particles diffused in the air will fall on the ground of the cleaning site like dust, which can be removed by removing dust.

Under certain conditions, there may be some traces of oil or water scattered on the scene. This is because there is some oil or water floating in the cleaned workpiece. The remaining oil or water does not adhere to the surface of the workpiece, but is free. Therefore, when compressed air is injected into the workpiece, the remaining oil or water is immediately ejected from the workpiece and dispersed around. In actual operation, before cleaning the workpiece with dry ice, the residual oil in the workpiece should be sucked out with a cloth.

4. Does dry ice cleaning cause impact depression on the workpiece surface?

Dry ice blasting is similar to sand blasting. Dry ice particles are sprayed onto the surface of the workpiece through compressed air, which will have a certain effect on the surface of the workpiece. However, the dry ice cleaning technology does not rely on the grinding effect between the dry ice particles and the surface of the workpiece to remove the dirt, but rather quickly freezes the dirt on the surface of the workpiece. The hardness of the dry ice particles is only 2MOHS, even if the dry ice particles directly hit the surface of the workpiece. This means crushing without damaging the surface of the workpiece. For workpieces with very low surface hardness, "snow and ice" can be used as a raw material to spray the workpiece surface. The main factor that damages the work piece is the wind pressure, so the fragile parts should be tested first, adjust the appropriate wind pressure before cleaning.

5. Is dry ice cleaning safe?

Dry ice is solid carbon dioxide, non-toxic and non-flammable. Therefore, as a whole, it is a safe cleaning method, which is harmless to human body and workpiece.

However, during the dry ice cleaning process, carbon dioxide is formed after the dry ice is vaporized.

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