Pest Control Packaging Technology (I)

The pest control packaging technology uses various physical factors (light, heat, electricity, freezing, etc.) or chemical agents to act on the body of pests to destroy the physiological functions and body structure of pests, degrade the living conditions of pests, and promote the death or suppression of pests. Pests reproduce to achieve the purpose of pest control.
First, the high temperature pest control packaging technology High temperature pest control packaging technology is the use of higher temperatures to inhibit the development and reproduction of pests. When the ambient temperature rises to 40-45°C, the general pest activity will be inhibited. At 45-48°C, most of the pests will be in a coma (summer) and die when the temperature rises above 48°C. Table 5-1 shows the relationship between temperature, and pests in the quagga.
High-temperature insecticidal packaging technology can be carried out using dry insecticides, steam insecticides, and the like.
Drying and insecticide is generally to put the items to be placed in the drying room or in the drying tunnel or oven, so that the indoor temperature rises between 65 and 110 DEG C, and it is also easy to breed the characteristics of the pest species according to the specifications of the items to be loaded. To determine the temperature and heating time requirements, baking process.
Table 5-1 Relationship between Death and Temperature of Pest Insects

Steam insecticide is the use of high-heat steam to kill pests, generally use the steam chamber, indoor temperature is maintained at about 80 °C, to deal with the victim of the product, in the indoor treatment 15 ~ 20min, pests can be completely killed.
Second, low temperature pest control packaging technology Low temperature pest control packaging technology is the use of low temperature to suppress the reproduction and development of pests, and to make them die. The pests in warehouses generally begin to stop moving at an ambient temperature of 8 to 15°C, and are paralyzed at -4 to 8°C. If such conditions last too long, the pests will die. Below -4°C is the critical point for death from pests in general. When the temperature drops to the critical point, the insect body fluid releases heat before freezing, and the body temperature rises. The frozen insects tend to recover. If the temperature is kept low, the insects will actually die.
General warehouse pests cannot reproduce when temperatures drop to 7°C and most of them begin to die. Various types of refrigeration equipment, such as freezers, cryogenic refrigerators, etc., can reduce the temperature to below 0°C, which is sufficient for pest control purposes.
Pests have a certain ability to resist cold at outside temperatures. In order to destroy the cold resistance of pests and accelerate its death, the following two issues should be noted when handling cold temperatures.
(1) The cold resistance of pests is closely related to the moisture content of foods. Various pests (including various insects) contain 50% to 90% of the water in their bodies. Storehouse pests live in plants and animals that stop growing. The amount of water obtained from food is low, so the water content in the body is also low. The water content of the imaginal insects is between 49.25% and 53.33%. If we feed three groups of cornucopias with 12%, 14%, and 18% of the three foods respectively, and then treat them at a low temperature, the temperature will drop from 0°C to minus 15°C. The results of the trial found that those who consumed 12% of water had the highest mortality rate, followed by 14% and 18%. Therefore, it can be considered that the higher the moisture content in the food of the pest, the stronger its cold resistance. Therefore, in the insect-proof packaging, it is necessary to reduce the moisture in the product to reduce the resistance of the insect within the allowable range of the moisture content of the inner product. Coldness accelerates its death.
(2) The cold resistance of pests has a close relationship with the cooling rate. The slower the cooling, the slower the heat loss in the insect body and the more stable the cooling state. On the contrary, the faster the cooling rate, the higher the body temperature at a higher temperature, the body fluid suddenly enters the crystalline state, which can accelerate pest death. If rapid heating and rapid cooling are repeated one after another in a short period of time, the cold resistance of pests can also be reduced, and the death of pests can be accelerated.
Third, ionizing radiation pest control packaging technology Ionizing radiation pest control packaging technology is the use of ray ray, gamma rays, fast neutrons, such as the killing ability of pests to death or infertility, so as to achieve the purpose of pest control.
Helium rays are an uncharged particle stream, and are electromagnetic waves with wavelengths from 0.01 nm to 10 nm, which have high penetrating power.
The nucleus of radioactive material is unstable. It continuously emits three kinds of rays: α, β and γ. Among them, γ-rays are a type of photon flow and have shorter wavelengths than gamma rays. Its properties are similar to those of ordinary visible light, ultraviolet light, and gamma rays. The difference is that its energy is very high, and its damage to pests is strong.
Fast neutrons are neutral particles of similar mass and protons. They are uncharged and have a particularly strong penetration. Radiation effects are higher than gamma rays.
(To be continued)