JPH03139235A - Method for carrying out insect killing treatment and device therefor - Google Patents

Abstract

PURPOSE:To kill insects in a short time by heating an article to be treated in a treating vessel kept in carbon dioxide atmosphere. CONSTITUTION:When an article to be treated is put in a treating vessel and insects attached to the article to be treated are killed, the inside of treating vessel 1 in which the article to be treated is put is evacuated by evacuating device 7 and then carbon dioxide gas is charged from a feed source 11 to keep the inside of treating vessel in carbon dioxide gas atmosphere. The article to be treated is heated in this state by heat treating device 16.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for applying insecticidal treatment to a treated object to which insects such as mites, fleas, and lice have adhered, and an apparatus used to carry out this method. It is something.

[Prior Art] In recent years, it has become a problem that mites that live on futons, tatami mats, carpets, etc. are the cause of allergic diseases. Additionally, fleas and lice are known to transmit various infectious diseases.

There is a method of using insecticides to exterminate pests, but since insecticides are generally harmful to humans, this method is used to kill insects that are attached to things that people touch, such as futons, tatami mats, carpets, and clothing. is not suitable.

Therefore, a method for exterminating insects attached to futons, tatami mats, carpets, clothing, etc. (herein referred to as objects to be treated) is to heat-treat the objects by placing them in a processing container. , a method has been adopted in which insects are killed by exposing them to high temperatures under atmospheric pressure.

[Problem to be solved by the invention] Pests such as mites, fleas, and lice will die if directly exposed to high temperatures, but in the case of objects to be treated such as futons and tatami mats, the temperature inside the object cannot be compared with the surrounding temperature. Since it is not easy to raise the temperature to the same level, insects that escape into the interior will survive if heat treatment is carried out for a short time. It is known that mites in particular are difficult to exterminate.

Therefore, in the past, heat treatment was carried out for more than two hours while maintaining the temperature inside the processing container containing the object to be processed at 70'C or more, which resulted in a problem of very poor work efficiency.

In addition, in the case of objects to be treated such as tatami mats, where it is difficult to raise the internal temperature to the same temperature as the ambient temperature, pests may not be completely killed even after heat treatment for about 2 hours. .

The purpose of the present invention is to propose an insecticidal treatment method that can exterminate even pests that are extremely difficult to kill, such as mites, in a much shorter processing time than conventional methods, and an insecticidal treatment device used to carry out the method. be.

[Means for Solving the Problems] The method of the present invention relates to an insecticidal treatment method in which an object to be treated is placed in a processing container and insects attached to the object are killed.
In the present invention, the object to be processed is heated in a carbon dioxide atmosphere inside the processing container.

Here, the carbon dioxide atmosphere means "a state in which the main component of the gas is carbon dioxide". Although it is preferable that all the gas in the processing container be carbon dioxide gas, there is no problem even if some other gas remains. That is, the inside of the processing container may have an atmosphere in which carbon dioxide gas is dominant (carbon dioxide gas atmosphere).

After putting the object to be processed into the processing container, in order to create a carbon dioxide atmosphere inside the processing container and to infiltrate the object to be processed, such as futons and tatami mats, the processing container containing the object to be processed must be It is preferable to inject carbon dioxide gas into the processing container after reducing the pressure inside the processing container. The higher the degree of vacuum inside the processing container when reducing the pressure inside the processing container, the more gas in the processing container can be replaced with carbon dioxide gas, and the amount of other residual gases can be reduced.

In the present invention, the workpiece is heated in a carbon dioxide atmosphere by supplying heated carbon dioxide gas into the processing container after reducing the pressure in the processing container in which the workpiece is placed. Also good.

In the above method, the object to be processed is heated, but the object to be processed may be cooled by a freezing device while the inside of the processing container is in a carbon dioxide atmosphere.

In this case as well, by injecting carbon dioxide gas into the processing container after reducing the pressure inside the processing container containing the object to be processed,
It is preferable to create a carbon dioxide gas atmosphere inside the processing container.

Further, it is preferable to create a carbon dioxide atmosphere in the processing container by injecting liquefied carbon dioxide gas into the processing container after reducing the pressure in the processing container containing the object to be processed.

Furthermore, after reducing the pressure in the processing container containing the processing object, the processing object may be cooled in a carbon dioxide atmosphere by supplying carbon dioxide cooled by a refrigerator into the processing container. good.

In the present invention, the apparatus used when heating the workpiece in a carbon dioxide atmosphere includes a processing container that accommodates the workpiece and can be kept airtight, a pressure reducing device that reduces the pressure inside the processing container, and a processing container. It can be configured with a carbon dioxide gas supply source connected via a knob and a heating device that heats the inside of the processing container.

Furthermore, instead of providing a heating device that heats the inside of the processing container, carbon dioxide gas supplied from a carbon dioxide gas supply source may be heated and supplied to the processing container.

In the present invention, the device used when cooling the object in a carbon dioxide atmosphere includes a processing container that can be kept airtight for storing the object that requires insecticidal treatment, and a vacuum that reduces the pressure inside the processing container. The apparatus may include a carbon dioxide gas supply source connected to the processing container via a valve, and a refrigeration device that cools the inside of the processing container.

As the carbon dioxide gas supply source, it is preferable to use one that injects liquefied carbon dioxide into the processing container and vaporizes it within the processing container.

Instead of cooling the inside of the processing container with a freezing device as described above, a cooling device that cools the carbon dioxide supplied from the carbon dioxide gas supply source is provided, and the carbon dioxide cooled by the cooling device is supplied into the processing container. You may also do this.

[Function] As mentioned above, when the object to be treated is heated or cooled in a carbon dioxide atmosphere, the insect-killing effect of the carbon dioxide gas and the insect-killing effect of the heating or cooling treatment are synergistic. It has become clear that insects can be killed in a much shorter time than with the conventional method of heat-treating the object.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 schematically shows the configuration of an apparatus for carrying out the method of the present invention, and in the figure, reference numeral 1 denotes a processing container arranged with its axis oriented in the horizontal direction. This processing container 1
is formed into a cylindrical shape, for example, and a lid 2 is attached to its open end so that it can be opened and closed, and by closing this lid, the inside of the processing container 1 can be hermetically sealed.

A thermometer 3 is inserted into the processing container by airtightly penetrating the upper part of the peripheral wall of the processing container 1, so that the temperature inside the processing container can be measured with the thermometer. In this example, an electric thermometer using a thermocouple or the like is used as the thermometer 3,
The display section 3a is provided outside the processing container.

If at least a portion of the inner door 2 is made transparent so that the inside of the processing container can be observed from the outside, a mercury thermometer or the like may be used as the thermometer 3 to read the temperature through the lid 2. can.

A pressure gauge 4 is also attached to the processing container 1, and the pressure inside the processing container can be measured by the pressure gauge.

A pressure reducing device 7 consisting of a vacuum pump is connected to a connecting pipe 5 provided on the end wall of the processing container 1 via a valve 6 .

A carbon dioxide gas supply source 11 is also connected to the processing container 1 through a valve 8, piping 9, and a valve 10. The carbon dioxide supply source 11 is, for example, a cylinder filled with liquefied carbon dioxide, and in this case, the valve 10 is attached to the cylinder.

An exhaust valve 12 is connected to the upper part of the processing container 1, and by opening the exhaust valve 12, the inside of the container 1 can be opened.

A support stand 13 is provided inside the processing container 1, and the object to be processed 14 is placed on this support stand.

Further, in this embodiment, an internal temperature sensor 15 is provided inside the processing container 1.
The probe L5a is inserted, and this probe 15a is inserted into the object to be processed 14.

The internal temperature sensor 15 has a temperature display section 15b, and the temperature inside the workpiece 14 can be read from this temperature display section.

A heat treatment device 16 is provided inside the processing container 1, and this heat treatment device is connected to a power source 17. The heat treatment device 16 is for heating or cooling the inside of the processing container 1, and when heating the inside of the processing container 1, a heating device such as an electric heater is used as the heat treatment device. Further, when cooling the inside of the processing container 1, a refrigerator is used as the heat processing device 16.

In this embodiment, a gas stirring device 18 consisting of a blower fan is also installed in the processing container 1, and by stirring the gas in the processing container with this gas stirring device, the temperature of each part in the container can be brought to a predetermined temperature in a short time. I'm trying to reach that.

The processing container 1 can be used depending on the size of the object to be processed.
It is configured to have an appropriate size depending on the amount of workpieces to be processed at a time. The processing container 1 may be of a stationary type, or may be of a mobile type by being attached to a truck bed or the like.

First, a method of performing insecticidal treatment by heat-treating the object to be treated in a carbon dioxide atmosphere using the above-mentioned apparatus will be described. In this case, the heat treatment device 16 is a heating device.

Prior to processing, the heating device 16 is energized in advance to heat the processing container 1 itself and the inside of the processing container 1. In parallel with this, the object to be processed 14 is carried into the processing container 1, and after the lid 2 is closed, the pressure inside the processing container 1 is reduced. In this case, valves 12 and 8 are closed, valve 6 is opened, and the pressure reducing device (
Vacuum pump) 7 is operated. The higher the degree of vacuum in the processing container 1, the greater the amount of carbon dioxide gas that can be filled later, but normally it is sufficient to reduce the pressure to about 1Q mmHg. After reducing the pressure inside the processing container 1, the valve 6 is closed, the valves 8 and 10 are opened, and carbon dioxide gas is injected into the processing container 1. When the pressure inside the processing container 1 becomes equal to atmospheric pressure, the valve 8 is closed, and the object to be processed 14 is heated at a predetermined temperature for a predetermined time.

The heating temperature and heating time are set to be long enough to kill insects attached to the object to be treated, but as mentioned above, when the object is heated in a carbon dioxide atmosphere, the heating time is lower than before. It can kill 100% of insects at low temperatures and in a shorter time than conventional methods. Appropriate values for heating temperature and treatment time should be determined in advance through experiments depending on the type of insect (.

After the heat treatment is completed, the valve 12 is opened to release the pressure inside the processing container that has increased due to heating, and then the lid 2 is opened and the object to be processed 14 is taken out. The next object to be processed is placed in the processing container, and the same operations as above are repeated thereafter.

In the above description, the object to be processed is heated in a carbon dioxide atmosphere, but the processing time can also be shortened by cooling the object in a carbon dioxide atmosphere.

In this case, a refrigerator may be used as the heat treatment apparatus 16 in FIG. 1, and the other configuration of the apparatus is exactly the same as in the case of performing heat treatment. The process is exactly the same as described above, except that instead of heating after injecting carbon dioxide gas, a refrigerator is operated to cool the object for a predetermined period of time.

When insecticidal treatment is performed by cooling the object to be treated using a refrigerator, a type of carbon dioxide gas supply source 11 that ejects liquefied carbon dioxide directly into the processing container 1 is used. It is preferable to vaporize carbon dioxide gas. In this way, since the temperature inside the processing container is lowered when the liquefied carbon dioxide gas is vaporized, the time required to lower the temperature inside the processing container to a predetermined temperature can be shortened.

In the embodiments described above, valve 6.8 can also be replaced by a switching valve.

Furthermore, if the internal temperature sensor 15 is provided as in the above embodiment, the internal temperature of the object to be processed can be known.
It is possible to accurately determine the processing time required to kill insects inside the object.

However, this internal temperature sensor can also be omitted.

In the above embodiment, it is preferable that the heat treatment device (heating device or freezing device) 16 is provided with a control circuit that automatically controls the treatment temperature to maintain it at a set value. The control method may be based on a well-known method of controlling energization to the heat treatment apparatus so as to reduce the deviation between the detected temperature value and the set value to zero.

In the above embodiments, the treatment temperature and treatment time can be set to constant values once the amount of material to be treated and the type of insect are determined.

Therefore, when it is detected that the lid 2 is closed, the valves 6, 8. 10 and heating device 16 in a predetermined sequence, all operations can be performed automatically.

As in the above embodiment, the heat treatment device 16 is energized in advance,
If the processing container 1 itself and the inside of the processing container 1 are heated or cooled, the time required for the object to be processed to reach a predetermined processing temperature can be shortened, so that the processing time can be shortened.

However, in the present invention, the heat treatment apparatus can be operated in any manner as long as the object to be treated is heated or cooled for a predetermined period of time in a carbon dioxide atmosphere.

For example, the heat treatment apparatus may be operated after accommodating the object to be processed in a processing container and sealing the processing container.
Further, the heat treatment apparatus may be operated after filling the processing container with carbon dioxide gas.

The present inventor conducted various experiments using mites, which are known to be extremely difficult to exterminate, as specimens to confirm that heating or cooling the object to be treated in a carbon dioxide atmosphere increases the insecticidal effect. Therefore, these experimental examples will be explained below.

In the following experiments, a cylindrical container with a diameter of 40 cm and a length of 30 cm was used as the processing container 1. Also, the lid 2 of the processing container
A transparent glass lid was used so that the inside of the processing container could be observed through the lid.

A mercury thermometer was used as the thermometer 3, and the temperature sensing portion at the tip of the thermometer was positioned approximately at the center of the processing container 1.

As the pressure reducing device 7, a vacuum pump capable of reducing the pressure to 10 −3 mmHg was used. When replacing the gas in the processing container 1 with carbon dioxide gas, the inside of the processing container], Q m
The pressure was reduced to 11 g or less, and then carbon dioxide gas was injected from the carbon dioxide gas supply source 11 until the inside of the processing container 1 reached atmospheric pressure.

In each experiment, long-haired mites or yellow-skinned mites were used as specimens. In each experiment, 10 to 20 specimens were placed in a glass test tube in the processing container 1. At that time, the opening of the test tube was covered with absorbent cotton to prevent the mites from escaping, but in order to bring the permeation conditions of carbon dioxide closer to the conditions inside the carpet or bedding, absorbent cotton was used as a lid to prevent carbon dioxide from entering. It was allowed to penetrate into the test tube through absorbent cotton.

Experiment (1) First, an experiment was conducted to investigate the effect of carbon dioxide gas on insects.

In this experiment, the insecticidal mite was used as a specimen, and the insecticidal effect was investigated when the specimen was placed in a carbon dioxide atmosphere for a certain period of time at room temperature (25° C.) and under normal pressure. In the experiment, a test tube containing a sample was placed in a processing container 1, and the lid 2 of the processing container was closed, and then the pressure inside the processing container 1 was reduced, and then carbon dioxide gas was injected into the processing container 1 to complete the processing. The inside of the container was brought to atmospheric pressure. After leaving it in this state for a certain period of time, open the lid 2 and remove the processing container 1.
The test tube was taken out from inside and the sample inside was observed.

It has become clear that all specimens in test tubes are alive immediately after being removed from the processing container, but some specimens die after a considerable amount of time has passed. Figure 2 shows the results of checking the number of dead specimens by examining the inside of the test tube taken out from the processing container at regular intervals.

The horizontal axis of FIG. 2 indicates the elapsed time after the completion of the treatment, and the vertical axis indicates the ratio (%) of the number of dead specimens to the total number of specimens at each elapsed time. Further, in FIG. 2, broken lines a, b, c, and d indicate the cases in which the specimen was exposed to the carbon dioxide atmosphere for 5 minutes, 10 minutes, 30 minutes, and 60 minutes, respectively.

The results of this experiment revealed that even if the mites were left in a carbon dioxide atmosphere for a certain period of time, they did not die immediately, but some of the specimens died after a certain amount of time. The mortality rate after a certain period of time increases by increasing the time the mites are left in the carbon dioxide atmosphere. However, even if a tick is left in a carbon dioxide atmosphere for 1 hour, it will take 72 hours (
The mortality rate after 3 days) was approximately 60%, and it became clear that a 100% mortality rate could not be expected.

This experiment suggests that when insects are exposed to a carbon dioxide atmosphere for a certain amount of time, they receive considerable damage, even if they do not die, or become susceptible to death.

Experiment (2) Using a skin mite as a specimen, after storing the test tube containing the specimen in the processing container 1, the processing container was placed inside the processing container 1 while keeping air at atmospheric pressure inside the processing container 1. was heated to a certain temperature. The mortality rate of the specimens was investigated when the heating temperature was varied and the heat treatment time was set to 10 minutes and 20 minutes.

The results of this experiment are shown in FIG. In FIG. 3, the horizontal axis shows the temperature inside the processing container 1 (heat treatment temperature), and the vertical axis shows the mortality rate. Moreover, the broken line a shows the case where the heat treatment time was 10 minutes, and the broken line 2 shows the case where the heat treatment time was 20 minutes.

From this experiment, it was found that 100% mortality can be achieved in the epidermal mites by heating at approximately 55°C for 10 minutes.
It has become clear that if the heat treatment time is 20 minutes, 100% mortality can be obtained at about 50°C.

In the case of a test tube, the temperature inside the test tube immediately becomes the same as that inside the processing container 1, so the heat treatment time described above is 100%.
However, since it takes time for the inside of carpets, futons, tatami mats, etc. to reach the temperature in the processing container 1, in order to obtain a 100% mortality rate at the above heat treatment temperature. The actual heat treatment time required will be even longer.

Experiment (3) In this experiment, the workpiece was heated in a carbon dioxide atmosphere to confirm the effectiveness of the method of the present invention. Baked epidermal mites were used as the specimen, and after the test tube containing the specimen was placed in the processing container 1, the air in the processing container 1 was replaced with carbon dioxide gas and the inside of the processing container 1 was heated to a predetermined temperature. . The results of this experiment are shown in FIG.

The horizontal axis in FIG. 4 shows the heating temperature inside the processing container, and the vertical axis shows the mortality rate. Broken lines a, b, and C show cases where the heat treatment time was 10 minutes, 15 minutes, and 20 minutes, respectively.

From this experiment, we found that when heat-treating a workpiece in a carbon dioxide atmosphere, if the heat-treating time is appropriately selected, the heat-treating temperature is lower than when heat-treating in air. It has become clear that a mortality rate of 0% can be obtained. That is, as shown in Fig. 3, when heat treatment is performed in air for 20 minutes, 100% mortality cannot be obtained unless heated to 50'C; If you do this, 100% reduction can be achieved by simply heating at 45°C for 20 minutes.
mortality rate can be obtained. Being able to lower the temperature of the heat treatment means that when treating carpets, futons, etc. with insecticide, it takes less time to bring the internal temperature to a temperature that will result in 100% mortality. This means that the time required for actual insecticidal treatment can be shortened.

The above has described an experiment in which the inside of the processing container 1 is heated, and next, an experiment in which the inside of the processing container 1 is cooled by a refrigerator will be described.

As a result of examining the ability of mites to survive at low temperatures, it was revealed that, although there are individual differences, there is a supercooling point for body fluids in the range of -22.5°C to -29.3°C. It is known that at supercooling points, the insect's body fluids freeze, and at the same time a slight increase in body temperature is observed. Insects will surely die if they are cooled to the supercooling point, but as a result of further experiments, mites can survive in the air at a relatively high temperature (-1000) before reaching the supercooling point.
The mortality rate was found to be 100%.

Furthermore, if a method is used to cool the mites in a carbon dioxide atmosphere, even at a higher temperature (for example, 0°C), the
% mortality rate, and it became clear that the synergistic effect between carbon dioxide gas and heat treatment was greater when low-temperature treatment was performed.

Experiment (4) First, we investigated the insecticidal effect of cooling mites in the air.

In this experiment, female adult mites of the epidermis mite and the long-haired mite were used as specimens, and a test tube containing the epidermal mite and a test tube containing the long-haired mite were placed in the processing container 1 at the same time. .

The refrigerator was then operated with air kept in the processing container, and the relationship between cooling temperature and mortality rate was investigated. In this experiment, the inside of the test tube was held at each temperature for 5 minutes, and then the test tube was taken out, and the mortality rate was examined after 1 day, 2 days, and 4 days.

Figure 5 shows the case where a scorched epidermal mite was used as a specimen and cooled for 5 minutes in the air.
b, c, d and e have cooling temperatures of 15°C and -1, respectively.
Cases of 0°C, -15°C, -20°C and -25°C are shown. From this result, it is possible to obtain a 100% mortality rate for epidermal mites by cooling them to -10°C.

In the case of cooling, the mortality rate reaches 100% when a certain number of days have passed after the cooling treatment, but even if death does not occur immediately due to the cooling treatment, it is certain after a certain number of days have passed. If death occurs, there is no practical problem because the purpose of pest extermination can be achieved.

Figure 6 shows the experimental results when a long-haired powder mite was used as a specimen and cooled for 5 minutes in the air;
It has become clear that 100% mortality can be achieved by cooling to 100%.

In addition, for the skin mites, the mortality rate was measured when the cooling treatment time was extended to 10 minutes. The results are shown in FIG. These results revealed that when the cooling time was extended, the mites died within a short period of time after the cooling treatment.

Experiment (5) Next, we conducted an experiment in which the mites were cooled in a carbon dioxide atmosphere.

In this experiment, first, a long hair mite was used as a specimen, and the inside of a test tube was maintained at a predetermined cooling temperature for 5 minutes in a carbon dioxide atmosphere. The results are shown in Figure 8, where the polygonal lines a, b, c, d, and e represent cooling temperatures of 0°C, -5°C, -10°C, -15°C, and -20°C, respectively.
The case of ℃ is shown.

In Figure 8, when the cooling temperature is OoC (a) and -5
Regarding (b) in the case of ℃, the data for one day after the cooling treatment is unknown because there is no observation record, but if the cooling treatment is performed in carbon dioxide gas, by cooling to -5℃,
It has become clear that the mortality rate will be 100% after at least the second month.

In other words, when long-haired powder mites were cooled for 5 minutes in the air, 100% mortality could not be achieved unless they were cooled to -25°C, as shown in Figure 6. However, according to the results shown in FIG. 8, it has become clear that by using cooling treatment and carbon dioxide gas in combination, 100% mortality can be obtained simply by cooling to 5°C.

Next, FIG. 9 shows the data obtained when the sample was cooled for 10 minutes in a carbon dioxide gas atmosphere using the same type of hair mite. From this, it was found that if the cooling treatment time was extended to 10 minutes, a 100% mortality rate could be obtained even when the cooling treatment temperature was 0°C.

Next, Figure 10 shows the results when the temperature in the test tube was maintained at -10°C for 10 minutes in a carbon dioxide atmosphere using epidermal mites as specimens. These results revealed that cooling in a carbon dioxide atmosphere accelerates the death of mites.

From the above experiments, it was revealed that the combination of carbon dioxide gas and heat treatment significantly increases the mite killing effect. In particular, it has been revealed that when cooling treatment is performed, the synergistic effect with carbon dioxide gas is large, and even if the cooling temperature is increased, 100% mortality can be achieved.

Although the above explanation takes the case of killing mites as an example, the present invention can also be applied to the extermination of pests other than mites, such as fleas and lice (which are easier to kill than mites). Of course.

In the embodiment shown in FIG. 1, the inside of the processing container 1 is heated or cooled by the heat processing device 16, but a heating device for heating carbon dioxide gas or a cooling device for cooling carbon dioxide gas is provided outside the processing container 1. may be provided to supply heated or cooled carbon dioxide gas into the processing container.

FIG. 11 schematically shows an example of the configuration of an apparatus for heating or cooling carbon dioxide outside the processing container and supplying it into the processing container. The suction port of a vacuum pump (pressure reducing device) 7 is connected to the auxiliary tank 21, and the discharge port of the vacuum pump is connected to a first inlet 21a of an auxiliary tank 21 via a switching cock 20. The switching cock 20 can be switched between a state in which the outlet of the vacuum pump 7 is communicated with the atmosphere (a state in which the inlet 21a of the auxiliary tank 21 is closed) and a state in which the outlet of the vacuum pump 7 is communicated with the auxiliary tank 21. It has become. A carbon dioxide gas supply source 11 is connected to a second inlet 21 - b of the auxiliary tank 21 via a valve 10 . Auxiliary tank 21
The outlet 21c is connected to the piping 22 and the secondary flow path 23 of the heat exchanger 23.
b and is connected to the processing container 1 through the valve 24. The primary flow path 23a of the heat exchanger 23 is supplied with a heating medium (high temperature fluid) or a cooling medium (fluid cooled by a refrigerator, liquefied gas, etc.) from a heating (or cooling) medium supply device 25. ing.

A thermometer 3 is connected to a conduit connecting the secondary flow path of the heat exchanger 23 and the valve 24 . In this example, the heat exchanger 23 and the heating (or cooling) medium supply device 25 constitute a carbon dioxide gas heating device or cooling device.

When performing the first insecticidal treatment using the device shown in Figure 11,
After putting the object to be processed 14 into the processing container 1, the valves 10 and 12 are closed, the valve 14 is opened, and the vacuum pump is turned on with the switch cock 20 switched so that the outlet of the vacuum pump 7 communicates with the atmosphere. drive. As a result, processing container 1
The inside of the auxiliary tank 20 and each pipe are evacuated. Next, the valve 6 is closed and the valve 10 is opened to supply carbon dioxide gas from the carbon dioxide supply source 11 through the auxiliary tank 20 and the heat exchanger 23 into the processing container 1 . At this time, the carbon dioxide gas is heated or cooled by the heating medium or cooling medium supplied from the heating (or cooling) medium supply device 25 to the primary flow path of the heat exchanger 23 . Inside the processing container 1 and auxiliary tank 20
The valve 10 is closed when the inside pressure reaches atmospheric pressure. Next, after switching the switching cock 20 so that the discharge port of the vacuum pump 7 is communicated with the auxiliary tank 20, the valve 6 is opened and the vacuum pump 7 is operated. As a result, processing container 1 - valve 6 → pump 7 → switching cock 20 - auxiliary tank 21 →
The carbon dioxide gas heated or cooled by the heat exchanger 23 is circulated along the route of heat exchanger 23 → valve 24 → processing container 1 to maintain the temperature inside processing container 1 at a predetermined processing temperature.

After a predetermined processing time has elapsed, the valve 24 is closed,
By operating the vacuum pump 7, carbon dioxide gas in the processing container 1- is recovered into the auxiliary tank 21. After the recovery of carbon dioxide gas is completed, the valves 6 and 24 are closed, and the switching cock 20 is switched so that the outlet of the vacuum pump 7 is communicated with the atmosphere.

By switching this cock, the entrance 21a of the auxiliary tank 2go
will be closed. Next, the valve 12 is opened to bring the inside of the processing container 1 to atmospheric pressure, and the lid 2 of the processing container 1 is opened to release the object 14 to be processed.
Take it outside.

Next, a new object to be processed 14 is carried into the processing container 1 and the lid 2 is opened.
After closing the valves 1 and 2, the valve 24 is closed, and the vacuum pump 7 is operated with the valve 6 open to evacuate the inside of the processing container 1. After the process container 1 has been evacuated, the valve 6 is closed, the switch cock 20 is switched so that the discharge port of the vacuum pump 7 communicates with the auxiliary tank 21, and the valve 24 is opened to drain the carbon dioxide in the auxiliary tank 21. Gas is supplied into the processing container 1 through the heat exchanger 23.

At this time, if the inside of the processing container 1 does not reach atmospheric pressure, the valve 10 is opened and carbon dioxide gas is supplied from the carbon dioxide gas supply source 11. Thereafter, the valve 10 was closed, the vacuum pump 7 was operated with the valves 6 and 24 open, and the heating or cooling was carried out along the route of processing container 1 → pump 7 → auxiliary tank 21 → heat exchanger 23 → processing container 1. Circulate carbon dioxide gas. Thereafter, similar operations can be repeated to sequentially perform insecticidal treatment on the objects to be treated.

If the auxiliary tank 21 is provided as in this embodiment and the carbon dioxide in the processing container 1 is collected into the auxiliary tank every time one treatment is completed, carbon dioxide can be saved. , it can also prevent unnecessary carbon dioxide from being emitted into the atmosphere.

However, the present invention is not limited to such a configuration, and the auxiliary tank 21 can be omitted in FIG. 11.

As shown in FIG. 11, after reducing the pressure inside the processing container, heated or cooled carbon dioxide gas is supplied into the processing container,
If the object to be processed is heated or cooled while creating a carbon dioxide atmosphere inside the processing container 1, the inside of the object to be processed is heated or cooled at the same time as carbon dioxide permeates into the object. Therefore, the insecticidal effect can be enhanced and the processing time can be shortened.

[Effects of the Invention] As described above, according to the present invention, the object to be treated is heated or cooled in a carbon dioxide atmosphere, so that the insect-killing effect of carbon dioxide gas and the insect-killing effect of heat stimulation are eliminated. Due to the synergistic effect, insects can be killed in a much shorter time than in the conventional method, which simply heat-treated the object.

Moreover, if the heat treatment is performed in a carbon dioxide atmosphere as in the present invention, the heating temperature required to obtain 100% mortality can be lowered than in the past when heat treatment is used, and cooling treatment In some cases, the cooling temperature required to achieve 100% mortality can be made higher than when performing the cooling treatment in air, so it is possible to save the energy required to perform the heat treatment.

[Brief explanation of the drawing]

Fig. 1 is a block diagram schematically showing an example of the configuration of an apparatus for carrying out the method of the present invention, Fig. 2 is a diagram showing the results of an experiment investigating the killing effect of carbon dioxide gas on mites, and Fig. 3 is a diagram showing the results of an experiment to investigate the effect of heat treatment on mites,
Figure 4 is a diagram showing the results of an experiment to confirm the effectiveness of the method of the present invention in which heat treatment is performed in a carbon dioxide atmosphere, and Figures 5 to 7 are diagrams showing the results of mites when cooling treatment is performed in air. Diagrams showing the results of experiments to investigate mortality rates, Figures 8 to 1
Figure 0 is a diagram showing the results of an experiment to demonstrate the effectiveness of the method of the present invention that performs cooling treatment in a carbon dioxide atmosphere, and Figure 11 is a diagram showing another example of the configuration of an apparatus for carrying out the method of the present invention. It is a schematic block diagram. 1... Processing container, 2... Lid, 3... Thermometer, 4...
...Pressure gauge, 6. 8. 10...Valve, 7...
Pressure reduction device, 11... carbon dioxide gas supply source, 16... heat treatment device, 23... heat exchanger, 25... heating (or cooling) medium supply device. 1 Figure Time - (1 interval) - 11 Kay Figure 1 degree f' (: ) -- 3z degree ("C) - 1 ◆ Figure 7 Number of days elapsed after cooling treatment (days) --- ◆ 8. Number of days passed (days) - 11 + Number of days passed (days) - Procedural amendment (spontaneous) 1゜2゜6 Case indication patent application Hei 1 - Name of the invention No. 276305 Relationship with the case of the person who amended the insecticidal treatment method and device Patent applicant Kishi 4-31-6-5, Shinbashi, Minato-ku, Tokyo 6. "25°C" column on page 25, line 8 of the statement of contents of the amendment. "-25

Claims (12)

[Claims] (1) An insecticidal treatment method for placing an object to be treated in a processing container and killing insects attached to the object, which is characterized by heating the object to be treated by creating a carbon dioxide gas atmosphere inside the processing container. Processing method. (2) In an insecticidal treatment method in which an object to be treated is placed in a processing container and insects attached to the object are killed, carbon dioxide gas is introduced into the processing container after reducing the pressure inside the processing container in which the object to be processed is placed. An insecticidal treatment method, characterized in that the object to be treated is heated in a state in which a carbon dioxide gas atmosphere is created in the treatment container by injecting a carbon dioxide gas into the treatment container. (3) In an insecticidal treatment method in which an object to be treated is placed in a processing container and insects attached to the object are killed, the pressure inside the processing container containing the object to be processed is reduced, and then a high temperature is applied to the inside of the processing container. An insecticidal treatment method comprising heating the object to be treated by supplying carbon dioxide gas. (4) In the insecticidal treatment method for placing an object to be treated in a processing container and killing insects attached to the object, the object to be treated is cooled by a freezing device while creating a carbon dioxide atmosphere in the processing container. Insecticide treatment method. (5) In an insecticidal treatment method in which an object to be treated is placed in a processing container and insects attached to the object are killed, carbon dioxide gas is introduced into the processing container after reducing the pressure in the processing container in which the object to be processed is placed. An insecticidal treatment method, characterized in that the object to be treated is cooled by a freezing device while the treatment container is injected with a carbon dioxide gas atmosphere. (6) In an insecticidal treatment method in which an object to be treated is placed in a processing container and insects attached to the object are killed, after reducing the pressure in the processing container in which the object to be treated is placed, liquefied carbon dioxide is added to the processing container. An insecticidal treatment method comprising: injecting gas to create a carbon dioxide atmosphere in the treatment container, and cooling the object to be treated with a freezing device. (7) In an insecticidal treatment method in which an object to be treated is put into a processing container and insects attached to the object are killed, a refrigerator is placed inside the processing container after reducing the pressure inside the processing container in which the object to be processed is placed. An insecticidal treatment method, characterized in that the object to be treated is cooled by supplying carbon dioxide gas cooled by a carbon dioxide gas. (8) A processing container that can be kept airtight for storing objects to be treated that require insecticidal treatment, a pressure reducing device that reduces the pressure inside the processing container, and a carbon dioxide gas supply source connected to the processing container via a valve. and a heating device that heats the inside of the processing container. (9) A processing container that can be kept airtight for storing objects to be treated that require insecticidal treatment, a pressure reducing device that reduces the pressure inside the processing container, and a carbon dioxide gas supply source connected to the processing container via a valve. An insecticide treatment device comprising: and a freezing device that cools the inside of the treatment container. (10) The insecticidal treatment apparatus according to claim 9, wherein the carbon dioxide gas supply source is of a type that injects liquefied carbon dioxide into the processing container and vaporizes it within the processing container. (11) A processing container that can be kept airtight for storing objects to be treated that require insecticidal treatment, a pressure reducing device that reduces the pressure inside the processing container, a carbon dioxide supply source, and a carbon dioxide gas supplied from the carbon dioxide supply source. An insecticide treatment device comprising: a heating device that heats carbon dioxide gas and supplies it to the treatment container. (12) A processing container that can be kept airtight for storing objects to be treated that require insecticidal treatment, a pressure reducing device that reduces the pressure inside the processing container, a carbon dioxide gas supply source, and a carbon dioxide gas supply source supplied from the carbon dioxide gas supply source. An insecticide treatment device comprising: a cooling device that cools carbon dioxide gas and supplies it to the treatment container.