Low temperature damage is to use liquid nitrogen to freeze waste rubber products to below the glass transition temperature, and then to use hammer or roller damage machine to destroy. There are two methods for low-temperature damage: direct freezing low-temperature damage method and low-temperature damage method of crushing first and then fine crushing under freezing conditions.
Direct freezing low temperature damage method. The production process of this destructive method is to cut the bead part of the tire on the tyre dissector, divide the tread into 2-3 pieces together, put them in the freezing (liquid nitrogen) equipment, and then destroy them with a hammer or roller destroyer, and then get the rubber powder.
Low temperature destroy method of crushing first and then fine crushing under freezing condition. The production process of this destructive method is as follows: after cutting waste tires, they are placed in refrigeration equipment, crushed first in hammer or roller destroyer, then frozen again, then finely crushed, and then obtained rubber powder. This production method needs to be refrigerated twice by liquid nitrogen, so the production cost is higher. But when this method is used to treat steel radial tire, the steel wire is easily separated from rubber, and the power consumption can be reduced correspondingly.
It is reported that the air-cooled cryogenic destroyer will produce high temperature in the process of high-speed operation. When destroying the heat-sensitive material, it will change because of the high temperature. So it is necessary to cool down the destroyer. The wf-30 air-cooled cryogenic destroyer developed by Jinan Shengling Machinery Manufacturing Co., Ltd. chooses a cold fan to inject cold air into the destroying warehouse to complete the cooling effect (the temperature can be adjusted), so that the material can be cooled. It will not change because of the high temperature. Material is destroyed to the required fineness when it enters the destroyer (the size of the material can be adjusted by replacing the screen). The product can be widely used for material destruction in pharmaceutical, food, chemical, national defense and scientific research industries, especially for heat sensitive materials and materials that can not be destroyed.
Low temperature damage process plays an irreplaceable role
Low temperature destructive technology is not a new skill. It has been industrialized as early as 1948. It has a long history of research on the recycling and utilization of waste rubber, plastics, food, pharmaceuticals, etc. It has mature skills and processes. It is necessary and meaningful to carry out low temperature destructive technology research. It is reported that the low temperature damage process has many advantages.
1. It is most suitable for destroying non-destructive substances at room temperature, such as rubber, thermoplastics, etc.
2. The inner classifier can obtain remarkable particle size distribution data.
3. Finer and more fluidity rubber powder can be obtained by breaking at room temperature, and the powder after breaking has good formability.
4. It can prevent dust, odor pollution and noise.
5. The power required for crushing is very low, which can improve the output value of the destroyer.
6. Destroying thermosensitive substances will not be oxidized and transformed by heat.
7. The difference of low temperature brittleness of various materials can selectively destroy complex materials, such as tires containing rubber, metal and fibers.
Polymer material rubber, as a high elastic material at room temperature, can be destroyed by lowering the temperature, making it brittle and destroying it in the destroyer insisting on low temperature, which can not be replaced by other destroying methods.
Low temperature damage plays an important role in the process of destruction of traditional Chinese medicine, such as pollution-free, such equipment in the process of destruction indoor temperature is generally below zero, showing a pollution-free situation; the scope of application is wide, no matter what kind of materials, regardless of the composition and properties of materials, such destroyers can meet the requirements of pharmaceutical technology. But the low temperature destroyer is usually used less because of the high cost of destroying.
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