CN114711204A - Low oxygen concentration insecticidal method and apparatus therefor - Google Patents
Low oxygen concentration insecticidal method and apparatus therefor Download PDFInfo
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- CN114711204A CN114711204A CN202210015844.8A CN202210015844A CN114711204A CN 114711204 A CN114711204 A CN 114711204A CN 202210015844 A CN202210015844 A CN 202210015844A CN 114711204 A CN114711204 A CN 114711204A
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M1/00—Stationary means for catching or killing insects
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/10—Devices for affording protection against animals, birds or other pests
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- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Pest Control & Pesticides (AREA)
- Environmental Sciences (AREA)
- Insects & Arthropods (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Birds (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Catching Or Destruction (AREA)
Abstract
The invention aims to provide a low oxygen concentration insecticidal method and an insecticidal device, which can carry out insecticidal and ovicidal action in a large amount of plants or crude drugs of more than 10kg in a short time while maintaining the quality of the plants or crude drugs. The invention provides an insecticidal method and a device used for the method, wherein the insecticidal method comprises the following steps: a step of replacing the gas with low oxygen concentration, in which the air in the sealed space for storing the object substance is replaced by inert gas, so that the oxygen concentration is less than 3%, wherein the object substance is a plant or crude drug with more than 10 kg; a gas temperature adjusting step of adjusting the temperature of the low oxygen concentration gas; a substance temperature adjusting step of adjusting the temperature of the target substance to 30 ℃ or higher.
Description
Technical Field
The present invention relates to a method for killing insects at low oxygen concentration in plants or crude drugs and an apparatus used for the method.
Background
An insecticidal technique using a low oxygen concentration insecticidal treatment without using an agent (low oxygen concentration insecticidal method) is known as an alternative insecticidal technique to fumigation of methyl bromide or aluminum phosphide. In the low oxygen concentration insecticidal method, not only adults but also larvae and eggs are killed by applying a low oxygen environment load to an insecticidal subject such as a crude drug for a certain period of time.
Regarding the low oxygen concentration insecticidal method, non-patent document 1 describes that a dry specimen with insect pests, i.e., tobacco beetles and corn weevils, is left in a space maintained at 30 ℃ for 3 weeks with an oxygen concentration of less than 0.1%, and that no insect pest recurs even after about 3 months has elapsed after the treatment.
Non-patent document 4 also discloses basically the same contents as non-patent document 3 by the same group as non-patent document 3.
As described in non-patent documents 1 and 2, the temperature of the atmosphere is maintained at 30 ℃ when the low oxygen concentration insecticidal treatment is performed, but no report is made focusing on the temperature of the treated object. In addition, the low oxygen concentration insecticidal method is applied to the treatment of plants or crude drugs of 10kg or more, and there has been no report so far.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-127294
Non-patent document
Non-patent document 1: muchuan りか ta; an apparatus for processing inactive ガスによる culture such as asphyxia for example, performing the processing example at と; preservation science, No. 38, 1-8 (1999)
Non-patent document 2: small temple yuzita; [ ] lower acid peptide degree induced cell height . in Yu Zhou Yao (cell height determination) at における processing stage at 27.5 deg.C, 30 deg.C; conservation science, No. 54, 161-170 (2015)
Non-patent document 3: dynasty emperor ノ; storage による storing the information about the function of the eggs of the thermally damaged insect pest ; 9 , a set of performance ideas from the 41 st Return to the great meeting of the City society for the management of pests
Non-patent document 4: north yuming he; history of CA を using いた storage processing for chinese pest medicine eggs; japanese society of packaging science 29 Reversal old times contribution album, 52-53 (dust information number e-06)
Disclosure of Invention
Problems to be solved by the invention
The purpose of the present invention is to provide a low oxygen concentration insecticidal method and an insecticidal device which can achieve insecticidal and ovicidal actions on a large amount of plants or crude drugs of 10kg or more in a short time while maintaining the quality of the plants or crude drugs.
Technical scheme for solving problems
The summary of the present invention is as follows:
(1) a method of killing insects comprising the steps of:
a step of replacing the gas with a low oxygen concentration gas, in which the air in the closed space for storing the object substance, which is a plant or crude drug of 10kg or more, is replaced with an inert gas so that the oxygen concentration is 3% or less;
a gas temperature adjusting step of adjusting the temperature of the low oxygen concentration gas;
a substance temperature adjustment step of adjusting the temperature of the target substance to 30 ℃ or higher.
(2) The pesticidal method according to the (1), wherein in the gas temperature adjustment step, the temperature of the low oxygen concentration gas is adjusted to 35 to 40 ℃.
(3) The pesticidal method according to (1) or (2), wherein in the substance temperature adjustment step, the temperature of the target substance is set to 30 ℃ or higher using a gas collection supply mechanism that collects the low-oxygen-concentration gas around the target substance and uniformly supplies the low-oxygen-concentration gas to the target substance.
(4) The pesticidal method according to (1) or (2), wherein in the substance temperature adjustment step, the temperature of the target substance is set to 30 ℃ or higher using an exhaust mechanism that uniformly supplies the low oxygen concentration gas to the target substance by actively exhausting the atmosphere around the target substance.
(5) The pesticidal method according to (3) or (4), wherein the gas collection supply mechanism or the gas discharge mechanism uses a supply nozzle which is inserted into the target substance and supplies the low oxygen concentration gas to the target substance at a desired pressure.
(6) The insecticidal method according to (5), wherein the supply nozzle has a ventilation section for supplying the low oxygen concentration gas to the target substance, and the ventilation section uses a hole or a net to such an extent that the target substance does not enter.
(7) The insecticidal method according to (6), wherein the air vent is provided at a tip end of the supply nozzle.
(8) The insecticidal method according to any one of the above (1) to (7), wherein the heated low oxygen concentration gas is blown to the target substance by a blower equipped with a heating unit.
(9) The pesticidal method according to any one of the above (1) to (8), which heats the target substance by means of an apparatus equipped with a heating means.
(10) The pesticidal method according to any one of (1) to (9), which comprises an oxygen concentration measurement step of measuring an oxygen concentration of the target substance or the vicinity of the target substance,
in the replacement step, the supply amount of the low oxygen concentration gas is adjusted in accordance with the target substance or the oxygen concentration around the target substance.
(11) The pesticidal method according to any one of (1) to (10), which comprises a temperature measuring step of measuring a temperature of the target substance or a temperature around the target substance,
in the gas temperature adjusting step, the temperature of the low oxygen concentration gas is adjusted in accordance with the temperature of the target substance or the temperature around the target substance.
(12) The pesticidal method according to (10) or (11), wherein in the substitution step, a supply time of the inert gas is adjusted by the oxygen concentration measurement step.
(13) The pesticidal method according to (11) or (12), wherein in the gas temperature adjustment step, the temperature of the low oxygen concentration gas is adjusted by the temperature measurement step.
(14) The pesticidal method according to any one of (11) to (13), wherein in the substance temperature adjustment step, the step time is adjusted by the temperature measurement step.
(15) The insecticidal method according to any one of the above (1) to (14), wherein in the replacement step, the inert gas is flowed so that the pressure in the sealed space is positive compared with the pressure outside the sealed space.
(16) The insecticidal method according to any one of the above (1) to (15), wherein in the replacement step, inflow of the inert gas into the closed space and discharge of the low oxygen concentration gas out of the closed space are actively performed.
(17) The pesticidal method according to any one of (1) to (16),
in the replacement step, a first sealed space and a second sealed space inside the first sealed space are provided in the sealed space, and the target substance is stored in the second sealed space,
flowing the inert gas into the second enclosed space,
The oxygen concentration of the low oxygen concentration gas in the second enclosed space is kept lower than the oxygen concentration in the first enclosed space.
(18) The insecticidal method according to (17), wherein in the replacement step, the inert gas is flowed so that a pressure in the second closed space becomes a positive pressure compared with a pressure in the first closed space.
(19) The pesticidal method according to any one of (1) to (18), wherein the replacing step includes an oxygen adsorbing step of adsorbing oxygen in the sealed space.
(20) The pesticidal method according to any one of (1) to (19), wherein the substance temperature adjustment step is continued for 3 days to 3 weeks.
(21) An insecticidal device having at least one element selected from the group consisting of:
(a) a processing cabinet having a closed space;
(b) an oxygen concentration adjusting means for replacing air in the sealed space with an inert gas so that the oxygen concentration is 3% or less;
(c) a gas temperature adjusting unit for adjusting the temperature of the gas in the closed space;
(d) a breathable target substance container which is provided in the processing cabinet and can contain 10kg or more of a plant or a crude drug as a target substance;
(e) (i) a gas collection and supply mechanism that collects gas of low oxygen concentration around the target substance and uniformly supplies the low oxygen concentration gas to the target substance,
(ii) an exhaust mechanism that actively exhausts the atmosphere around the target substance to uniformly supply the low oxygen concentration gas to the target substance,
(iii) a blower equipped with a heating unit for heating the low oxygen concentration gas and blowing the low oxygen concentration gas to the subject matter, and
(iv) a device equipped with a heating unit for heating the object substance.
(22) The insecticidal device according to (21), wherein the gas collection supply mechanism has a supply nozzle that is inserted into the subject substance and supplies the low oxygen concentration gas to the subject substance at a required pressure.
(23) The insecticidal device according to the above (22), wherein the supply nozzle has a ventilation portion for supplying the low oxygen concentration gas to the target substance, and the ventilation portion uses a hole or a net to such an extent that the target substance does not enter.
(24) The insecticidal device according to (23), wherein the air vent is provided at a front end of the supply nozzle.
(25) The insecticidal device according to any one of (21) to (24), which comprises an oxygen concentration measurement means for measuring an oxygen concentration of the target substance or a concentration of oxygen in the vicinity of the target substance.
(26) The insecticidal device according to any one of (21) to (25), which is provided with a temperature measurement means for measuring a temperature of the target substance or a temperature around the target substance.
(27) The insecticidal device according to (25) or (26), wherein the oxygen concentration adjustment means has means for adjusting the inert gas replacement time by the oxygen concentration measurement means.
(28) The insect-killing apparatus according to (26) or (27), wherein the gas temperature adjusting means has means for adjusting the temperature of the low oxygen concentration gas by the temperature measuring means.
(29) The insect killer according to any one of (21) to (28), wherein the oxygen concentration adjusting means comprises means for allowing the inert gas to flow so that the pressure in the sealed space becomes positive compared with the pressure outside the sealed space.
(30) The insect killer according to any one of (21) to (29), wherein the oxygen concentration adjustment means comprises means for actively performing the inflow of the inert gas into the closed space and the discharge of the low oxygen concentration gas.
(31) The insecticidal device according to any one of (21) to (30), wherein,
the oxygen concentration adjustment means includes:
a first closed space and a second closed space inside the first closed space are provided in the closed space, and the target substance is stored in the second closed space,
flowing the inert gas into the second enclosed space,
a unit in which the oxygen concentration of the low oxygen concentration gas in the second enclosed space is kept lower than the oxygen concentration in the first enclosed space.
(32) The insecticidal device according to (31), wherein the oxygen concentration adjustment means has means for flowing the inert gas so that the pressure in the second closed space becomes positive compared with the pressure in the first closed space.
(33) The insecticidal device according to any one of (21) to (32), wherein the oxygen concentration adjustment means includes means for adsorbing oxygen in the closed space.
(34) The insecticidal device according to any one of (21) to (33), which comprises means for maintaining the temperature of the target substance at 30 ℃ or higher for 3 days to 3 weeks.
Effects of the invention
According to the present invention, it is possible to kill insects and eggs in a large amount of plants or crude drugs of 10kg or more in a short time while maintaining the quality of the plants or crude drugs.
Drawings
Fig. 1 is a diagram showing a state in which a low oxygen concentration gas is supplied to a target substance by collecting the low oxygen concentration gas around the target substance, and a ventilation unit of a supply nozzle is positioned at the tip of a gas collection supply mechanism that uniformly supplies the low oxygen concentration gas to the target substance, and the ventilation unit of the supply nozzle is inserted into the target substance.
Fig. 2 is a view showing a state in which the periphery of the target substance is actively exhausted, the aeration portion of the supply nozzle is positioned at the tip of the exhaust mechanism for uniformly supplying the low oxygen concentration gas to the target substance, and the aeration portion of the supply nozzle is inserted into the target substance to supply the low oxygen concentration gas to the target substance.
Fig. 3 is a diagram showing a specific configuration of the supply nozzle.
Fig. 4 is a view showing a state in which a heating means for heating a target substance is inserted into the target substance, the temperature of the target substance is adjusted by heating the target substance, and oxygen concentration is adjusted by introducing a low-oxygen-concentration gas through a wall surface or an upper opening of a target substance-containing container.
FIG. 5 is a graph showing the results of a measurement test of the essential oil content.
Fig. 6 is a graph showing sensory evaluation results of dried radish.
FIG. 7 is a graph showing the results of a sensory test on dried chives.
FIG. 8 is a graph showing the test results of example 6.
FIG. 9 is a graph showing the test results of example 7.
FIG. 10 is a graph showing the test results of example 8.
Detailed Description
The target substance of the present invention is not particularly limited as long as it is a plant or crude drug that is harmful to pests, and examples thereof include agricultural products and food products, and specifically include: cereals such as rice, wheat, and corn; beans such as soybean and adzuki bean; fruits of fruit trees such as chestnut; yam such as cassava and sweet potato; dried materials such as Lentinus Edodes and bonito; flowers such as chrysanthemum, orchid, komatsuna, and the like; vegetables; fibers such as silk and cotton; spices such as pepper and clove; medicinal herbs and woods such as crude drug; imported wood and other wood materials; processed products of the above (for example, rice flour, wheat flour, tapioca flour, snack, biscuit, macaroni, powdery drink, paper bag, etc.), seeds of the above cereals, beans, etc.
The pest targeted for the present invention differs depending on the kind of plant or crude drug to be targeted, and is not particularly limited, but examples thereof include: corn weevil, red rice milling borer, snout moth (such as Indian meal moth), tobacco beetle, booklice, chestnut weevil, etc., and tick, fly, bee, ant, termite, etc.
The insecticidal method comprises the following steps:
a step of replacing the container with a low-oxygen-concentration gas, in which a target substance, in which pests such as harmful insects (eggs, larvae, pupae, adults) or ticks, or potentially dangerous plants or crude drugs are present, is placed in a target substance-containing container (for example, a flexible container, a tray, a polypropylene bag, a polyethylene bag, gauze, or a hemp bag) in an amount of 10kg or more, preferably 2000kg or less, and more preferably 80 to 1000kg, and the air in the sealed space is replaced with an inert gas (for example, nitrogen gas or argon gas) in a processing cabinet (for example, a crude drug storage cabinet) having a sealed space so that the oxygen concentration is 3% or less;
a gas temperature adjusting step of adjusting the temperature of the low oxygen concentration gas;
a substance temperature adjusting step of adjusting the temperature of the target substance to 30 ℃ or higher.
The target substance container used in the present invention preferably has air permeability. The reason is to prevent the crude drug from deteriorating due to moisture. In the present invention, when the non-low-oxygen-concentration gas is exhausted into the target substance container, the low-oxygen-concentration gas passes through the wall of the target substance container from the outside of the target substance container, and easily reaches the target substance. Further, when the low oxygen concentration gas is supplied into the target substance container, the non-low oxygen concentration gas present in the target substance container passes through the wall of the target substance container and is easily discharged to the outside of the target substance container. Here, "air permeability" means that gas inside and outside the target substance container flows through the wall of the target substance container. The material of the target substance container is preferably polypropylene, polyethylene, hemp, cotton, paper, or the like. Further, even if the material of the target substance container itself has no air permeability, the material is not limited to these as long as the air permeability is improved by processing such as weaving or punching. On the other hand, when the target substance container has no or low air permeability, the substance temperature adjusting step of the present invention can adjust the temperature and humidity around the target substance by forcibly feeding or discharging the low oxygen concentration gas into the substance container.
Fig. 1 to 4 each show an embodiment of the present invention, and the present invention will be described using these embodiments.
In the step of replacing the gas with the low oxygen concentration, the valve present between the oxygen concentration adjustment unit 6 and the processing cabinet 1 is opened, and an inert gas (nitrogen gas or the like) is introduced into the processing cabinet 1 from the oxygen concentration adjustment unit 6.
In order to achieve the insecticidal and ovicidal effects of the present invention, the oxygen concentration in the treatment cabinet 1 needs to be 3% or less, usually 2% or less, preferably 1% or less, more preferably 0.6% or less, and still more preferably 0.1% or less.
In the gas temperature adjusting step, the temperature of the atmosphere gas (nitrogen gas or the like) is adjusted in the gas temperature adjusting unit 7. The gas temperature adjusting unit 7 is, for example, a boiler.
The temperature of the low oxygen concentration gas in the ambient gas may be appropriately changed depending on the temperature of the target substance 8, but is usually 30 ℃ or higher, and preferably 35 to 40 ℃.
In the substance temperature adjusting step, the temperature of the target substance 8 is set to 30 ℃ or higher, preferably 30 to 40 ℃.
As described above, it is difficult to maintain the temperature of the entire target substance in a large amount of 10kg or more at 30 ℃ or more by merely maintaining the temperature of the low oxygen concentration gas of the atmospheric gas at 30 ℃, and it is difficult to obtain a sufficient insecticidal and ovicidal effect in a short time.
The unit for setting the temperature of the target substance to 30 ℃ or higher is not particularly limited, and examples thereof include the following:
(1) in the gas temperature adjusting step, the temperature of the low-oxygen-concentration gas is adjusted to 35 to 40 ℃;
(2) in the material temperature adjusting step, the temperature of the target material is set to 30 ℃ or higher by using a gas collection and supply mechanism that collects the low oxygen concentration gas around the target material and uniformly supplies the low oxygen concentration gas to the target material;
(3) in the substance temperature adjusting step, the temperature of the target substance is set to 30 ℃ or higher by using an exhaust mechanism that uniformly supplies the low oxygen concentration gas to the target substance by actively exhausting the gas around the target substance;
(4) blowing the heated low oxygen concentration gas to the target substance by using a blower equipped with a heating unit;
(5) heating the object substance by using a device equipped with a heating unit; and so on, the process of the present invention,
these 2 or more units may be combined as necessary.
An embodiment of the above unit (2) is shown in fig. 1 and 3. The gas collection and supply mechanism 3 is inserted into the target substance 8, and uses the supply nozzle 4 that supplies the low oxygen concentration gas to the target substance 8 at a desired pressure. Further, an embodiment of the supply nozzle 4 is shown in fig. 3. The supply nozzle 4 has a ventilation portion 42 for supplying the low oxygen concentration gas to the target substance 8, and the ventilation portion 42 preferably uses a hole or a mesh to such an extent that the target substance 8 does not enter. The air vent is preferably provided at the tip of the supply nozzle and preferably at the lower part of the target substance container 2.
An embodiment of the above unit (3) is shown in fig. 2 and 3. As the exhaust mechanism 9, for example, an exhaust fan is used, and the ventilation portion of the supply nozzle 4 located at the tip of the exhaust mechanism 9 is inserted into the target substance 8 to supply the low oxygen concentration gas to the target substance 8. In the above-described unit (3), the air vent 42 is preferably a hole or a mesh to such an extent that the target substance 8 does not enter, and is preferably provided at the tip of the supply nozzle 4.
If the air blower equipped with the air blowing function and the air discharging function is used, the same device can be used for the air discharging mechanisms 9 of the collected air supply mechanisms 3 and (3) of the unit (2), and the switching can be performed appropriately.
In the unit (4), examples of the blower equipped with the heating unit include: a dryer (blower), a sirocco fan, and a pipeline fan. In a blower capable of blowing air while pressurizing, like a dryer, the temperature of the air to be blown can be adjusted by adjusting the amount of air blown or the size of an air outlet.
An embodiment of the above unit (5) is shown in fig. 4. Examples of the apparatus equipped with the heating unit 10 include: a sleeve heater, a heat pipe, and a Peltier (Peltier) element, which can be inserted into the target substance 8 for use.
In the above units (1) to (5), the target substance can be brought to a desired temperature in a short time by using a device capable of stirring the target substance. In addition, when a stirring-enabled device is used, even if an active gas adjustment mechanism is not provided, as in the gas collection supply mechanism 3, the exhaust mechanism 9, and the supply nozzle 4 in fig. 1 and 2, it is possible to supply a low-oxygen-concentration gas to the target substance 8 by utilizing the air permeability of the target substance storage container 2.
In the above units (1) to (5), the low oxygen concentration gas can be more efficiently supplied into the target substance container 2 by detecting the oxygen concentration, the gas temperature, or the target substance temperature in the processing cabinet 1 or the target substance container 2, and by providing the control unit 5 having the control oxygen concentration adjusting unit 6 and the gas temperature adjusting unit 7, the gas collection supply mechanism 3, the blower equipped with the heating means, and the heating means 10. When the temperature of the target substance 8 is high, for example, a low oxygen concentration gas of 30 ℃ or lower may be supplied to set the target substance to a desired temperature. In the unit (3), since the temperature inside the target substance container 2 is close to the temperature of the discharge air, a temperature sensor may be provided in the supply nozzle 4.
The unit for adjusting the oxygen concentration in the closed space for storing the substance to be stored to 3% or less is not particularly limited, and examples thereof include the following:
(1) flowing the inert gas so that the enclosed space is a positive pressure with respect to the outside of the enclosed space;
(2) actively performing the inert gas inflow into the closed space and the low oxygen concentration gas discharge;
(3) a first sealed space and a second sealed space inside the first sealed space are provided in the sealed space, the target substance is stored in the second sealed space, and the inert gas is caused to flow into the second sealed space so that the oxygen concentration of the low oxygen concentration gas in the second sealed space is kept lower than the oxygen concentration in the first sealed space;
(4) the inert gas is flowed so that the pressure in the second sealed space becomes positive compared with the pressure in the first sealed space,
(5) setting an oxygen adsorption step for adsorbing oxygen in the closed space; and the like,
these 2 or more units may be combined as necessary.
An embodiment of the unit (1) will be described with reference to fig. 1. A valve existing between the oxygen concentration adjustment unit 6 and the processing chamber 1 is opened, and an inert gas (nitrogen gas or the like) is introduced into the processing chamber 1 from the oxygen concentration adjustment unit 6. The controller 5 adjusts the inflow amount of the inert gas from the oxygen concentration adjuster 6 so that the internal pressure of the processing chamber 1 becomes positive with respect to the outside of the processing chamber 1. Therefore, the inflow of the high oxygen concentration gas from the outside of the processing cabinet 1 into the processing cabinet 1 can be prevented, and the oxygen concentration in the processing cabinet 1 can be maintained at the low oxygen concentration.
An embodiment of the unit (2) will be described with reference to fig. 1. A valve existing between the oxygen concentration adjustment unit 6 and the processing chamber 1 is opened, and an inert gas (nitrogen gas or the like) is introduced into the processing chamber 1 from the oxygen concentration adjustment unit 6. The inert gas is actively flowed into the processing chamber 1 through the control unit 5, and further, a discharge mechanism, not shown, is provided in the processing chamber 1, and the gas in the processing chamber 1 is actively discharged through the discharge mechanism. Therefore, when a gas having a high oxygen concentration is introduced into the processing cabinet 1 from the outside of the processing cabinet 1, the oxygen concentration in the processing cabinet 1 is increased, but the oxygen concentration in the processing cabinet 1 can be maintained at a low oxygen concentration by forcibly removing the gas in the processing cabinet 1 and introducing an inert gas.
An embodiment of the above-described unit (3) will be described with reference to fig. 1. A second processing cabinet, not shown, is provided inside the processing cabinet 1. An inert gas (nitrogen gas or the like) is introduced into the processing chamber 1 from the oxygen concentration adjusting unit 6. The oxygen concentration in the treatment cabinet 1 is kept lower than the oxygen concentration outside the treatment cabinet 1, and the oxygen concentration in the second treatment cabinet (the second sealed space) is kept lower than the oxygen concentration between the treatment cabinet 1 and the second treatment cabinet (the first sealed space). Therefore, thanks to the space between the processing cabinet 1 and the second processing cabinet (the above-described first closed space), the second processing cabinet further prevents inflow of gas outside the processing cabinet 1, and the oxygen concentration in the second processing cabinet (the above-described second closed space) can be kept more constant. This can reduce the flow rate of the inert gas flowing into the second processing chamber (the second enclosed space).
An embodiment of the above-described unit (4) will be described with reference to fig. 1. The above-mentioned unit (3) is the same as the basic unit. The pressure inside the processing cabinet 1 is maintained at a positive pressure compared to the pressure outside the processing cabinet 1, and the pressure inside the second processing cabinet (the second enclosed space) is maintained at a positive pressure compared to the pressure between the processing cabinet 1 and the second processing cabinet (the first enclosed space). Therefore, thanks to the space between the processing cabinet 1 and the second processing cabinet (the above-described first closed space), the second processing cabinet further prevents inflow of gas outside the processing cabinet 1, and the oxygen concentration in the second processing cabinet (the above-described second closed space) can be kept more constant. Therefore, the flow rate of the inert gas flowing into the second processing chamber (the second enclosed space) can be reduced.
An embodiment of the unit (5) will be described with reference to fig. 1. The processing chamber 1 has an oxygen adsorption portion, not shown. The oxygen adsorption unit adsorbs oxygen inside the treatment tank 1. Examples of the oxygen adsorbing portion include, but are not limited to, oxygen scavengers such as azure (agelless), activated carbon, and pyrogallol. Therefore, the oxygen concentration in the treatment cabinet 1 can be maintained at a low oxygen concentration. This can reduce the flow rate of the inert gas flowing into the second processing chamber (the second enclosed space).
The step of adjusting the temperature of the substance is usually continued for 2 to 28 days, preferably 3 to 3 weeks, and more preferably 3 to 17 days.
Examples
The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto.
(example 1)
Tests were carried out on the effect of temperature change, oxygen concentration change and treatment time on the insecticidal effect.
(treatment of insects)
The weevil (adult) of corn, the beetle (adult) of tobacco, the larva of tribolium castaneum (adult), the booklice (adult) and the Indian meal moth (larva) are taken as objects. Regarding these pests, in the cultural pest dictionary (the political independency human culture research and the impactment) man insect pest く dominant ハンドブック (サイエンスフォーラム), figure refrigerator food pest (the national education symposium), and the satellite pest · day 4 ( research and the other), the corn weevil lays eggs after perforating the grain with an oral device and inserting the same therein, the growth of the larva after hatching the grain becomes a pupa, the emergence of the pupa becomes a corn beetle after the brown adult bites the seed coat, the tobacco beetle does not easily escape from the grain, the grain beetle does not easily cause the pest to take a pest, the grain beetle does not easily take a pest, the grain beetle after biting the grain, and the larva becomes a simulated meal after hatching, the larva grows into the larva, the larva grows into the grain, the object perforates the grain, the object, the characteristics of the tobacco beetle are not easily caused by the corn beetle, many of them are observed on the ground of feed factories and flour mills, and are often mixed in cereal flour and processed products thereof, and herbal medicines, spices and animal specimens are also damaged.
The pests of bonito joints, dried noodles, cheese, cookies, grain flour, etc. are widely caused by the booklice, and are generally found not only in general houses and food factories but also in medicine factories. Not only for storing foods such as cereal flour, but also for animal and plant specimens. Biting mold, which occurs in book pastes, foods, etc., favors a humid environment. Parthenocarpic reproduction is reported, with a number of examples.
Indian meal moth is a stored grain Pest that damages various foods such as brown rice, dried fruits, and spices, and is known as a species frequently occurring as an insect mixed with foreign matter (Williams, 1964 an. appl. biol., 53, 459-475; Mailis, 1997, Handbook of Pest Control). The Indian meal moth has a strong large jaw, has a strong piercing force on a container, a packaging material and the like, and can enter the package, and thus can enter the package. In particular, it is known that the larvae cause insect damage to the embryo from the outside and can damage the crude drugs of grains and seeds. Further, according to the report of subgenus et al (japan applied animal insect society, 51 st congress, 2007), larvae of indian meal moth grew in the peach kernels and the jujube kernels of crude drugs by perforation and emerged as adults, and thus it is not expected that the disinsection is easy.
(treatment conditions)
Placing the mixture at a temperature of (1) the oxygen concentration is below 3.0 percent and the temperature is 30 ℃; (2) the oxygen concentration is below 0.6 percent, and the temperature is 30 ℃; (3) the oxygen concentration is below 0.3 percent, and the temperature is 30 ℃; (4) the insecticidal rate was determined at an oxygen concentration of 0.1% or less and a temperature of 30 ℃ for each period. In any of the conditions, the humidity was set to 70%, and it was considered that the insecticidal ratio was not affected by the humidity.
(test procedure)
The insects were raised in a constant temperature chamber, and the raising chambers were divided into 20X 4 foods according to the development stage, and placed in a hypoxic chamber. Thus, the number of females in each test was 80. The feeding box is filled with foods which are favored by the test insects. A vial containing 10mL of distilled water was placed in the hypoxic chamber to maintain humidity. The low-oxygen chamber is filled with nitrogen gas or a mixed gas of nitrogen gas and oxygen gas, and sealed under the target oxygen concentration condition. The sealed hypoxic cell was left in a thermostatic chamber set to the temperature at which the test was performed.
(death judgment)
After treatment according to each treatment condition, the individuals who were not moved one day later were sacrificed.
(calculation of insecticidal Rate)
The number of dead individuals was calculated as ÷ 80 × 100.
(test results)
Table 1 shows (1) results of the insecticidal efficiency under the conditions of an oxygen concentration of 3.0% or less and a temperature of 30 ℃. The insecticidal rate of the corn weevil and the Indian meal moth on the 5 th day and the tribolium castaneum on the 17 th day is 100 percent. The treatment for 5 to 17 days confirmed the sufficient insecticidal effect.
[ Table 1]
The insecticidal rate at an oxygen concentration of 3.0% or less and a temperature of 30 deg.C
Table 2 shows (2) results of the insecticidal efficiency under the conditions of an oxygen concentration of 0.6% or less and a temperature of 30 ℃. The insecticidal rates of the tribolium castaneum and the booklice on the 2 nd day, the corn weevil on the 4 th day and the tobacco beetle on the 10 th day are 100 percent. Thus, 100% disinsection was achieved between 2 and 10 days, and a sufficient disinsection effect was confirmed.
[ Table 2]
The insecticidal rate at 30 deg.C with oxygen concentration below 0.6%
Table 3 shows (3) results of the insecticidal efficiency under the conditions of an oxygen concentration of 0.3% or less and a temperature of 30 ℃. In addition, table 4 shows (4) the results of the insecticidal ratio under the conditions of an oxygen concentration of 0.1% or less and a temperature of 30 ℃. The insect killing rate of the corn weevils and the tobacco beetles on the 3 rd day is 100%. Thus, 100% of insecticidal effect was achieved within 3 days, and sufficient insecticidal effect was confirmed.
[ Table 3]
The insecticidal rate at 30 deg.C with oxygen concentration below 0.3%
[ Table 4]
The insecticidal rate at 30 deg.C with oxygen concentration below 0.1%
From the treatment conditions (1) to (4), it is understood that the lower the oxygen concentration is, the higher the pesticidal effect tends to be under the same temperature conditions. The oxygen concentration needs to be 3.0% or less, and in view of the adjustment accuracy of the oxygen concentration, it is usually preferably 2% or less, preferably 1% or less, more preferably 0.6% or less, and further preferably 0.1% or less.
(example 2)
Tests were conducted on the effect of temperature change, oxygen concentration change and treatment time on the ovicidal effect.
(treatment of insects)
The target is corn weevil (ovum), tobacco beetle (ovum), red-spotted beetle (ovum), Indian meal moth (ovum).
(treatment conditions)
Placing the mixture at the temperature of 30 ℃ and under the condition that (1) the oxygen concentration is less than 3.0 percent; (2) the oxygen concentration is below 0.6 percent and the temperature is 30 ℃; (3) the oxygen concentration is below 0.3 percent and the temperature is 30 ℃; (4) the ovicidal ratio was determined at an oxygen concentration of 0.1% or less and a temperature of 30 ℃ for each period. The ovicidal rate was calculated by taking the number of imago hatchlings in the untreated area (oxygen concentration 21.0%, temperature 30 ℃) as the number of parents. In any of the conditions, the humidity was set to 70%, and it was considered that the ovicidal rate was not affected by the humidity.
(test procedure)
The number of eggs of the tobacco beetle, the tribolium castaneum and the Indian meal moth used for each test is 80. The corn weevils lay eggs in the brown rice, and therefore the number of eggs is adjusted as follows. Corn weevils were bred to 100g of brown rice for 3 days by feeding 500 adult parent worms per brown rice, and 8g of the egg-bred brown rice was used for each test. It was empirically found that about 80 adult hatching numbers were observed per 8g of brown rice by the present rearing.
The brown rice which produces the above eggs and spawns is stored in a hypoxic chamber. A small vial of 10mL of distilled water was placed in the hypoxic chamber to maintain humidity. The low-oxygen chamber is filled with nitrogen gas or a mixed gas of nitrogen gas and oxygen gas, and sealed under the target oxygen concentration condition. The sealed hypoxic cell was left in a thermostatic chamber set to the temperature at which the test was performed.
(survival judgment)
After the treatment according to each treatment condition, the incubated individuals were kept at an optimum incubation temperature at an oxygen concentration of 21.0%, and the individuals after the incubation were regarded as living.
(calculation of ovicidal Rate)
Calculated as (1-number of larvae hatched in treated area/number of larvae hatched in untreated area) × 100.
(test results)
Table 5 shows (1) results of the ovicidal rate under the conditions of an oxygen concentration of 3.0% or less and a temperature of 30 ℃. Even in any of corn weevils, tobacco beetles, tribolium castaneum, and indian meal moth, the ovicidal rate in 14 days was 100%, and a sufficient ovicidal effect was confirmed.
[ Table 5]
Ovicidal rate at an oxygen concentration of 3.0% or less and a temperature of 30 deg.C
Table 6 shows (2) the results of the ovicidal rate under the conditions of an oxygen concentration of 0.6% or less and a temperature of 30 ℃. The ovicidal rate of the tribolium castaneum and the Indian meal moth in 2 days, the ovicidal rate of the corn weevil in 7 days and the ovicidal rate of the tobacco beetle in 10 days is 100 percent, and the sufficient ovicidal effect is confirmed.
[ Table 6]
Ovicidal rate at oxygen concentration of 0.6% or below and temperature of 30 deg.C
Table 7 shows (3) the results of the ovicidal rate under the conditions of an oxygen concentration of 0.3% or less and a temperature of 30 ℃. The ovicidal rates of the corn weevils on day 4 and the tobacco beetles on day 6 were 100%, and a sufficient ovicidal effect was observed.
[ Table 7]
Ovicidal rate at an oxygen concentration of 0.3% or less and a temperature of 30 DEG C
Table 8 shows (4) the results of the ovicidal rate under the conditions of an oxygen concentration of 0.1% or less and a temperature of 30 ℃. In the insecticidal and ovicidal treatment of crude drugs, it is important to perform "complete insecticidal" (insecticidal and ovicidal rate of 100%) in a short time, and the ovicidal rate of the corn weevil and tobacco beetle was 100% on day 4, and a sufficient ovicidal effect was confirmed.
[ Table 8]
Ovicidal rate at 30 ℃ and oxygen concentration of 0.1% or less
From the treatment conditions (1) to (4), it is understood that the lower the oxygen concentration is, the higher the ovicidal effect tends to be under the same temperature conditions. The oxygen concentration is 3.0% or less, and in view of the adjustment accuracy of the oxygen concentration, it is usually preferably 2% or less, preferably 0.6% or less, and more preferably 0.1% or less.
(example 3)
Tests were carried out on the effect of temperature change and treatment time on the insecticidal and ovicidal effect.
(treatment of insects)
The corn weevil (imago/egg) and the tobacco beetle (imago/egg) are taken as objects.
(treatment conditions)
The insecticidal rate and the ovicidal rate were determined at (1) a temperature of 25 ℃, (2) a temperature of 28 ℃, (3) a temperature of 30 ℃ in each period. In any of the conditions, the oxygen concentration was set to 0.1% and the humidity was set to 70%, and it was considered that the insecticidal rate and the ovicidal rate were not affected by the oxygen concentration and the humidity.
The procedure for (test procedure), (survival determination), (calculation of pesticidal rate), and (calculation of ovicidal rate) was the same as in examples 1 and 2.
(test results)
Table 9 shows the results of the insecticidal rate and the ovicidal rate at (1) a temperature of 25 ℃, (2) a temperature of 28 ℃, (3) a temperature of 30 ℃. Regarding both tobacco beetles and corn weevils, adult insects require 4 days for killing at 25 ℃ and 3 days at 28 ℃ and 30 ℃. The ovicidal action of the eggs takes 7 days at 25 ℃, 5 days at 28 ℃ and 4 days at 30 ℃.
[ Table 9]
Comparison of the temperatures of the insecticidal and ovicidal Effect at an oxygen concentration of 0.1%
From the treatment conditions (1) to (3), it is understood that the higher the temperature is, the higher the insecticidal and ovicidal effects are, under the same oxygen concentration conditions. The oxygen concentration is 0.1% or less, and the effect of killing ova is high even at any of the temperatures (1) to (3), but the temperature is preferably 25 ℃ or more, preferably 28 ℃ or more, and more preferably 30 ℃ or more.
(example 4)
Tests were conducted to examine the influence of temperature change, oxygen concentration change and treatment time on the effect of the drug ingredients.
(test materials)
Dried mints were used. The brand is "big dipper". Mint is a typical crude drug belonging to the genus Mentha of the family Labiatae and used in the recipe of Han dynasty to dry the aerial parts. The test material was selected because it had a leaf-like shape that readily transmits temperature and was important for its efficacy as a crude drug, and it contained a large amount of essential oil components that are expected to decrease with temperature.
(treatment conditions)
Storing at (1) no treatment, (2) 30 deg.C, (3) 40 deg.C, (4) 50 deg.C, and (5) 70 deg.C for 2 weeks and 4 weeks, respectively. (2) The oxygen concentration of (1) to (5) is 0.5% or less. The term "untreated" means that the composition is stored at a temperature of 20 ℃ or lower without adjusting the oxygen concentration.
(Low oxygen concentration treatment)
In the treatment conditions (2) to (5), the mint was packed in the bag under each treatment condition, and a nitrogen gas tube was provided at the lowermost part of the bag for nitrogen gas substitution. Nitrogen gas was flowed at a constant flow rate to maintain the oxygen concentration in each bag at 0.5% or less, and the bags were placed in incubators set at respective temperatures. Then, the temperature and humidity were kept constant in the incubator during the conditions. With regard to the treatment condition (1), mints were stored in an aluminum bag and kept at 20 ℃ or lower. After storage during the conditioning period, an essential oil content determination test was performed.
(essential oil content measurement test method)
The measurement test was carried out by cutting up mint according to the Japanese pharmacopoeia crude drug test method and monograph of drugs.
(test results)
The results of the essential oil content determination test are shown in fig. 5. The vertical axis represents the essential oil content (ml) per 50g of the test material, and the horizontal axis represents the temperature set according to the treatment conditions. The white bar graph shows the result of storage for 2 weeks, and the black bar graph shows the result of storage for 4 weeks. If the storage times are compared, it can be seen that the longer the storage time, the more the reduction in the essential oil content tends to be, but the lower the treatment temperature, the smaller the difference between the reductions in the essential oil content. If the treatment temperatures are compared, the higher the treatment temperature, the greater the reduction in essential oil content. Comparing the untreated essential oil content of the treatment condition (1) at the temperature of (2) 30 ℃ and the temperature of (3) 40 ℃, it was found that the essential oil content of the storage time of 2 weeks and 4 weeks was 90% or more, and the influence of the temperature was small. The content of essential oil in the treatment conditions (4) at 50 ℃ and (5) at 70 ℃ is less than 90% compared with that in the untreated treatment condition (1), and the temperature has influence on the content of essential oil. From this, it was confirmed that the content of essential oil was less affected under the conditions of low oxygen concentration and storage time of 40 ℃ or less and 4 weeks or less. The content of the essential oil of the shredded peppermint is preferably 1.0ml/50g or more. The treatment conditions (4) were also higher than the standard at a temperature of 50 ℃ in the test of this time. However, in practice, mints do not necessarily have a high essential oil content due to sample inhomogeneities. In this case, if the treatment is performed at a temperature of 50 ℃ or higher, the possibility of lowering the standard of the essential oil content is increased. That is, as the conditions which do not impair the essential oil content and enable stable low oxygen concentration treatment, it is preferable to adopt the conditions of a storage time of 40 ℃ or less and 4 weeks or less.
(example 5)
Tests were conducted to examine the influence of temperature change, oxygen concentration change and treatment time on the effect of the drug ingredients.
(test materials)
Rhizome of cnidium officinale Makino 3 batches were used. Cnidium officinale Makino is a representative crude drug mostly used in the prescription of hanfang, which is obtained by peeling off roots and stems of cnidium officinale Makino of Umbelliferae and drying. The test material was selected because it contained essential oil expected to decrease with temperature or a component (ferulic acid) that should be an index of change in composition.
(treatment conditions)
The (1) is not treated; (2) storing at 35 deg.C with oxygen concentration below 0.5% for 2 weeks; (3) oxygen hardness of 0.5% or less, temperature of 35 ℃, and storage for 4 weeks as treatment conditions. The term "untreated" means that the crude drug is stored under a storage condition in which the quality of the crude drug is generally maintained, at a temperature of 15 ℃ or lower and without adjusting the oxygen concentration, and the storage time is the same as that of (2) and (3), respectively.
(Low oxygen concentration treatment)
The crude drug was packed in a laminated bag with a lock, and the oxygen concentration in the laminated bag was changed to a value corresponding to each treatment condition by nitrogen substitution. After standing in a sealed state for 1 day, the oxygen concentration was measured again to confirm that no air leakage from the laminated bag occurred. Then, the temperature and humidity were kept constant in the incubator during the conditions. Further, after storage during the conditioning period, it was confirmed that the oxygen concentration and temperature in the laminated bag did not change. The humidity is set to 60% or less under any condition. After storage during the conditioning period, a quality evaluation test was performed.
(quality evaluation items)
Measuring TLC, pH, water activity, drying loss, diluted ethanol, essential oil content, and component quantification (ferulic acid). These items are items generally used for evaluating quality of crude drugs.
(test results)
The results of the cnidium officinale makino quality test are shown in Table 10. As described in the "Property" item, in any of the lots and quality evaluation items, when (1) the untreated condition and (2) the condition of 0.5% or less oxygen concentration, 35 ℃ temperature, and 2 weeks of storage were compared, no difference was observed between the two treatment conditions. Similarly, when (1) the untreated condition and (3) the condition of oxygen concentration of 0.5% or less, temperature of 35 ℃ and storage for 4 weeks were compared, no difference was observed between the two treated conditions. Thus, it was confirmed that the drug components were not affected under the conditions of low oxygen concentration, temperature of 35 ℃ and storage time of 4 weeks or less.
[ Table 10]
Japanese Ligusticum wallichii quality test result
(example 6)
Tests were conducted on the effect of temperature change, oxygen concentration change and treatment time on the odor and taste effects of the food.
(test materials)
Commercially available dried turnip and dried chive were used. Dried turnips have a strong sweet taste and are characterized by chewiness, and dried chives are foods characterized by aroma and spicy taste. In all sensory evaluations, a test material that is considered to be easily clear in change of odor and taste was selected.
(treatment conditions)
Storing dried turnip and chive under 2 conditions of (1) untreated condition and (2) low oxygen concentration condition for more than 4 weeks. The term "untreated" means that the condition of 15 ℃ is adopted in the state of preservation of the crude drug, and the term "low oxygen concentration treatment" means that the condition of 35 ℃ is adopted at an oxygen concentration of 0.5% or less.
(Low oxygen concentration treatment)
And (3) filling dried turnips or chives into a laminated bag with a lock catch, and performing nitrogen replacement to ensure that the oxygen concentration in the laminated bag reaches the value of each treatment condition. After standing in a sealed state for 1 day, the oxygen concentration was measured again to confirm that no air leakage from the laminated bag occurred. Then, the temperature and humidity were kept constant in the incubator during the conditions. Further, no change in oxygen concentration and temperature was confirmed in the laminated bag after storage during the conditioning period. After storage during the conditioning period, a quality evaluation test was performed. In the samples, 4 samples were prepared from dried radish and dried chive, and 300g of each sample was filled in the low-oxygen pack.
(treatment time monitoring)
In the packages contained in the samples (1) untreated and (2) low-oxygen-concentration-treated, the changes in oxygen concentration and temperature inside the packages were monitored for a treatment time of 4 weeks or more, and it was confirmed that the oxygen concentration was maintained at 0.5% or less and the temperature was maintained within the range of the set temperature ± 2 ℃.
(sensory evaluation method)
After treatment, 3 out of 4 samples were used for evaluation (1 sample ready for use) in each of 2 respective treatment conditions in dried turnips and dried chives. From each of the 3 specimens, 80g of the sample was collected and 240g of the sample was collected as a sample for sensory evaluation (n: 1).
The dried turnips were washed with water and soaked for 20 minutes before sensory evaluation, and the dried chives were soaked in hot water for 2 minutes before sensory evaluation.
Sensory evaluations were conducted by 10 panelists.
(sensory evaluation items)
Comparative evaluation (two-point comparison method) was performed in which (1) the untreated test material was used as a reference sample and (2) the test material was treated at a low oxygen concentration.
Dried turnips were evaluated for 4 items, namely "good flavor", chewiness intensity of mouthfeel "," intensity of sweetness ", and" overall palatability ". The dried chives were evaluated for 5 items of "good flavor", "hardness" in mouthfeel ", intensity of taste" sweetness "," intensity of spicy taste ", and" overall palatability ".
(sensory evaluation results)
Sensory evaluation results of the dried radishes are shown in fig. 6. Sensory test results of dried chives are shown in fig. 7. The average of the evaluation values of the 10 panelists is shown. The vertical axis represents the evaluation value, and the evaluation value "3" represents the same as the unprocessed value. The horizontal axis represents evaluation items.
As can be seen from fig. 6, the dried radish had "good flavor" of 2.5, "chewy strength" of 2.7, "sweet strength" of 2.4, and "overall palatability" of 2.5.
As can be seen from fig. 7, the dried chives had a "good flavor" of 2.4, a "hardness" of 2.9, a "sweet intensity" of 3.1, a "spicy intensity" of 2.4, and a "comprehensive palatability" of 2.2.
When the sensory evaluation results of the treatment conditions (1) untreated and (2) low-oxygen-concentration treated were compared, no significant difference was observed in any of the evaluation items. From this, it was confirmed that the conditions of an oxygen concentration of 0.5% or less, a temperature of 35 ℃ and 4 weeks or less had no influence on the flavor and taste of the food. This indicates that, as a method of utilizing low-oxygen-concentration disinfestation for food products, disinfestation can be performed without impairing the odor and taste by performing low-oxygen-concentration disinfestation immediately before packaging the products.
(example 7)
The following tests were carried out: the time for heating the target substance to the insecticidal temperature was confirmed using a blower for blowing the atmospheric gas of the treatment cabinet to the target substance.
(treatment conditions)
The target substance to be subjected to the insecticidal treatment, i.e., food or crude drug or its raw material, is usually stored in a treatment cabinet at 15 ℃ or lower for the purpose of maintaining the quality. 15 ℃ is referred to as the initial temperature. The lower limit of the insecticidal temperature was 30 ℃ in the insecticidal test, the ovicidal test, the quality test and the food sensory test of examples 1 to 5. In order to set the target substance to the insecticidal temperature, the temperature is raised from the initial temperature by about 15 ℃. This is referred to as Δ t15 ℃. Further, since the temperature of the target substance needs to be raised efficiently, the atmosphere temperature of the treatment cabinet is further 5 ℃ higher than the lower limit of the insecticidal temperature and is around 35 ℃. This is referred to as Δ t20 ℃. In examples 1 to 6, Δ t20 ℃ is a temperature effective for insecticidal purposes while preventing the quality of the target substance from decreasing.
The japonica rice treatment cabinet uses a dryer.
80kg of polished round-grained rice stored at 15 ℃ or lower and having an initial temperature of 15 ℃ or lower was treated by raising the temperature of the treatment cabinet to an atmospheric temperature of Δ t20 ℃ and setting the treatment conditions below. Tests were conducted under the processing conditions of (1) blowing with a heating unit, (2) blowing without a heating unit, and (3) no-treatment with a heating unit and blowing.
(test procedure)
80kg of rice was divided into 4 drying trays and stacked and contained. The bottom surface of each drying tray is mesh-shaped and has air permeability. Further, the upper portion of the uppermost drying tray is open. A temperature measuring device is arranged at the inner side of the central part of the polished round-grained rice in each drying tray.
As (1) the air blowing method with heating means, a blower for generating hot air is interposed between the 2 nd and 3 rd layers of the drying tray to blow air. (2) As an air blowing method without a heating unit, an air blower is provided below the lowermost drying tray to blow air. (3) As an untreated method, dry trays are stacked in a treatment cabinet.
Setting the initial temperature of the processing cabinet and the japonica rice to be 15 ℃, then raising the temperature of the atmosphere in the processing cabinet to delta t20 ℃, and starting to measure the temperature of the japonica rice. Under each treatment condition, the measured value of each temperature measurement position was the arrival time at Δ 15 ℃ at which all insecticidal temperatures were reached. In addition, the time of arrival at Δ 15 ℃ was calculated by linear approximation simulation under the processing condition that Δ 15 ℃ was not reached even after 30 hours from the start of measurement, and the time of measurement was up to 182 hours at the maximum.
(test results)
The test results are shown in fig. 8. The vertical axis represents temperature Δ t (. degree. C.) and the horizontal axis represents elapsed time (hours). (1) The results of the air blowing with the heating unit, (2) the air blowing without the heating unit, (3) the non-treatment without the heating unit and the air blowing are respectively represented by circles, triangles, and squares.
(1) The air supply with the heating unit is carried out, and the time that the temperature of the polished round-grained rice in each drying tray reaches delta 15 ℃ of the insecticidal temperature is about 6 hours. Further, (2) the result of performing air blowing without the heating unit was about 22 hours. Further, (3) the temperature reached after 182 hours without the heat unit and the blast air was Δ 10.8 ℃. By simulation, the time of arrival at Δ 15 ℃ was presumed to be 20 days later.
In addition, in (1) the air blowing with the heating unit and (2) the air blowing without the heating unit, even after reaching delta 15 ℃, the object substance quality is basically maintained below 40 ℃.
From the above results, it was confirmed that the temperature of the target substance was rapidly raised to 30 to 40 ℃ of the insecticidal temperature by setting the atmospheric temperature of the treatment cabinet to Δ 20 ℃ and blowing air to the target substance, which was an appropriate method for holding. Further, it was confirmed that the time for the insecticidal treatment was effectively shortened by the air blowing with the heating unit as compared with the untreated air.
The ambient temperature of the treatment cabinet is not limited to Δ 20 ℃. For example, it is expected that the insecticidal treatment time can be further shortened by setting the atmospheric temperature to Δ 20 ℃ or higher, blowing air to the target substance, lowering the atmospheric temperature or stopping the blowing air after the temperature of the target substance reaches the insecticidal temperature, or performing both of them. Further, the ambient temperature may be increased by setting the ambient temperature to Δ 20 ℃ or less and supplying the increased temperature to the target substance by blowing air with heating such as a heater or blowing air with heating under pressure to the target substance.
(example 8)
The effect of the time for which the supply nozzle for supplying the atmosphere gas of the processing chamber to the target substance raises the target substance to the insecticidal temperature was tested for confirmation of the temperature rise.
(treatment conditions)
The target substance to be subjected to the insecticidal treatment, i.e., food or crude drug or its raw material, is usually stored in a treatment cabinet at 15 ℃ or lower for the purpose of maintaining the quality. 15 ℃ is referred to as the initial temperature. The lower limit of the insecticidal temperature was 30 ℃ in the insecticidal test, the ovicidal test, the quality test and the food sensory test of examples 1 to 6. In order to set the target substance to the insecticidal temperature, the temperature was raised from the initial temperature by about 15 ℃. This is referred to as Δ t15 ℃. Further, since the temperature of the target substance needs to be raised efficiently, the atmosphere temperature of the treatment cabinet is further 5 ℃ higher than the lower limit of the insecticidal temperature and is around 35 ℃. This is referred to as Δ t20 ℃. In examples 1 to 6, Δ t20 ℃ is a temperature effective for insecticidal purposes while preventing the quality of the target substance from decreasing.
Since the initial temperature of the target substance was around 25 ℃, the insecticidal temperature Δ t15 ℃ of the target substance was set to 40 ℃ and the atmospheric temperature Δ t20 ℃ of the treatment cabinet was set to 45 ℃.
Tests were conducted under conditions of (1) blowing air to the target substance, (2) blowing air from the target substance, and (3) comparison of no blowing air and no blowing air, using wheat as the target substance at 0.8t (bulk density; 0.76 kg/L).
(device)
Fig. 1 shows (1) blowing air to the target substance and fig. 2 shows (2) blowing air from the target substance. The air supply and exhaust (3) is not performed, and is formed without the air collection supply mechanism and the supply nozzle in fig. 1.
The wheat 0.8t of the subject substance 8 was contained in the flexible container of the subject substance containing container 2. The temperature measuring instruments, not shown, are arranged at 6 positions in total as follows: the object substance container 2 has 2 positions at both ends of the edge of the bottom surface 1 at the position 1/4 near the bottom surface; the side opposite to the side disposed at the position of the front 1/4 at the position of 1/2 near the bottom surface has 2 at both ends, 1 at the center of the front 4 and 1 at the center of the upper surface.
The air vent 42 provided in the supply nozzle 4 is preferably provided at the tip of the supply nozzle 4. The ventilation portion 42 is disposed below the target substance container 2. The position of the vent 42 is clarified by an experiment for effectively raising the temperature of the target substance 8.
(test procedure)
The atmospheric temperature in the processing cabinet 1 reaches Δ t20 ℃, and then gas collection and discharge are performed at a ventilation rate of about 1.5 ventilation/minute, and the temperature of the target substance 8 is measured. The measurement was carried out for 97 hours, and under each treatment condition, the time until all of the temperature measurement values reached Δ t15 ℃ of the insecticidal temperature was measured. In addition, the arrival time at 15 ℃ was calculated by linear approximation simulation under the treatment condition that Δ t15 ℃ was not reached.
(test results)
The test results are shown in fig. 9. The vertical axis represents temperature Δ t (. degree. C.) and the horizontal axis represents elapsed time (hours). (1) The results of the air blowing to the target substance, (2) the air discharge from the target substance, and (3) the non-processing without air blowing and air discharge are respectively shown by circles, triangles, and squares.
(1) The time required for all the temperature measurement positions to reach Δ 15 ℃ of the insecticidal temperature by blowing air to the object substance was about 96 hours. Further, (2) the result of exhausting air from the target substance was estimated to be about 130 hours by simulation. Further, (3) the results of the non-processing without blowing and discharging are estimated to require 250 hours or more by simulation.
It was confirmed that the method of blowing air or discharging air can significantly shorten the processing time as compared with the method of not processing air.
The flexible container used in this time has 15 threads woven into the container in a crisscross manner per inch, and has good air permeability. Therefore, (1) when the air is blown to the target substance, the low-temperature gas initially at the initial temperature in the flexible container is discharged into the processing chamber through the flexible container, and is replaced with the low-temperature gas. In addition, (2) when the air is exhausted from the target substance, the atmosphere gas at the insecticidal temperature in the treatment cabinet enters the flexible container through the flexible container, and is replaced with the low-temperature gas at the initial temperature. In this way, the container for containing the substance to be stored is made to have air permeability, so that the inside of the container can be replaced with the insecticidal temperature gas more quickly.
(example 9)
The low oxygen concentration replacement confirmation test to be confirmed was performed with respect to the effect of the time period during which the supply nozzle for supplying the atmosphere gas of the processing chamber to the target substance is activated to replace the target substance with the low oxygen concentration gas having the insecticidal concentration.
(treatment conditions)
The processing conditions are (1) air blowing into the object substance, (2) air discharge from the object substance, and (3) no air blowing or air discharge. Fig. 1 shows (1) a device configuration for blowing air into a target substance. Fig. 2 shows (2) a device structure for exhausting air from the target substance. As a comparison of (1) and (2), (3) an unprocessed state without performing air supply and air discharge was set. (3) The apparatus of (3) is constructed without a gas collection supply mechanism and supply nozzle in FIG. 1.
(device)
Fig. 1 shows (1) blowing air to the target substance and fig. 2 shows (2) exhausting air from the target substance. The air supply and exhaust (3) is not performed, and is formed without the air collection supply mechanism and the supply nozzle in fig. 1.
The wheat 800kg of the subject substance 8 was contained in the flexible container of the subject substance containing container 2. The oxygen concentration measurement position (not shown) is centered in the target material container 2 for (1) blowing air into the target material, (2) discharging air from the target material to the bottom of the target material container 2, and for (3) no blowing air or discharging air. This measurement position is the measurement position at which the temperature rise is the most retarded among the respective processing conditions at the time of the temperature rise confirmation test in example 8. Thus, the position where the replacement with the low oxygen concentration gas is the slowest is determined, and the oxygen concentration measurement position is set.
The arrangement position of the supply nozzle 4 was the same as the temperature rise confirmation test in example 8.
(test procedure)
The treatment cabinet 1 was replaced with a low oxygen concentration gas to 0.2%. As the gas collection supply mechanism of fig. 1 and the gas discharge mechanism of fig. 2, gas collection and gas discharge are performed at a ventilation rate of about 1.5 ventilation/minute based on the volume of the flexible container. The time required for each oxygen concentration measurement site to reach 3.0% of the upper limit of the insecticidal concentration was measured.
(test results)
The test results are shown in fig. 10. The vertical axis represents the oxygen concentration (%), and the horizontal axis represents the elapsed time (minutes). (1) The results of the air blowing into the object, (2) the air discharge from the object, and (3) the non-processing without air blowing and air discharge are respectively represented by circles, triangles, and squares.
The time required for each oxygen concentration measurement site to reach 3.0% of the upper limit of the insecticidal concentration was (1) 60 minutes for blowing air to the target substance, (2) 77 minutes for exhausting air from the target substance, and (3) 190 minutes for no air blowing or exhausting and no treatment.
It was confirmed that the method of blowing air or discharging air can significantly shorten the processing time as compared with the method of not processing air.
The flexible container used in this case was woven with 15 threads per inch in length and breadth, and the air permeability was good. Therefore, (1) when the air is blown to the target substance, the initial gas initially present in the flexible container is discharged into the processing chamber through the flexible container, and is replaced with the low-oxygen-concentration gas. In addition, (2) when the air is exhausted from the target substance, the low oxygen concentration gas having the insecticidal concentration in the treatment cabinet enters the flexible container through the flexible container, and is replaced with the initial gas. In this way, the container for containing the target substance is made to be air-permeable, so that the container can be replaced with the low oxygen concentration gas more quickly.
When the temperature substitution time in example 8 was compared with the oxygen substitution time in example 9, 96 hours were required for the temperature substitution time even when air was blown to the target substance. On the other hand, the oxygen substitution time was completed at 190 minutes even without treatment. From this, it was found that the temperature substitution time required more time than the oxygen substitution time. Therefore, it is necessary to provide a heater or the like in the target substance during temperature rise and actively raise the temperature. On the other hand, in the low oxygen concentration replacement, when the atmosphere gas is a low oxygen concentration gas, even if the replacement operation such as air blowing or air discharging is not actively performed in the target substance container, the low oxygen concentration gas can be introduced into the target substance container having air permeability and replaced with the low oxygen concentration gas. That is, a mechanism related to temperature rise may be actively provided without providing a mechanism related to oxygen concentration replacement, or a simple device may be employed.
(example 10)
The following experiments relating to the temperature rise confirmation test and the low oxygen concentration replacement confirmation test were carried out according to examples 8 and 9.
(means and conditions)
A processing cabinet; DAIKIN APPLIED SYSTEMS CO, LTD made hypoxia insecticidal device
A processing cabinet volume; about 6m3
The oxygen concentration of the treatment cabinet; 0.1 percent of
Temperature inside the treatment cabinet (ambient temperature); 35 deg.C
An exhaust gas acceleration device; high-whisker industry manufactured turbine pipeline fan T-100 type
The exhaust amount of the exhaust accelerating device; found to be 0.72m3Minute/min
Initial temperature of the subject substance: 15 deg.C
A test was conducted under conditions of (1) exhausting air from the target substance (used in a T-100 type turbo duct blower manufactured by high-end industries), and (2) not exhausting air, as a treatment condition, using 0.2T (bulk density; 0.49kg/L) of cnidium officinale Makino as the target substance.
0.2kg of cnidium officinale makino of the object substance 8 is contained in the flexible container of the object substance containing container 2.
The temperature measuring instruments, not shown, are arranged at 6 positions in total as follows: the upper left front, the upper right front, the lower left front, the lower right front, and the center of the target material accommodating container 2.
The oxygen concentration measurement position, not shown, is disposed at the center 1 of the target substance container 2.
The arrangement position of the supply nozzle 4 is the same as in embodiments 8 and 9.
(temperature test procedure)
After the temperature of the atmosphere in the processing cabinet 1 reached 35 ℃, gas collection and gas discharge were performed at a ventilation rate of about 1.9 ventilation/minute, and the temperature of the target substance 8 was measured. The time for each temperature measurement to reach all 30 ℃ of the insecticidal temperature was measured.
(oxygen concentration test procedure)
The treatment tank 1 was replaced with a low oxygen concentration gas to 0.1%. As the gas collection supply mechanism of fig. 1 and the gas discharge mechanism of fig. 2, gas collection and gas discharge are performed at a gas exchange rate of about 0.76 gas exchanges/minute with reference to the volume of the flexible container. The time required for each oxygen concentration measurement site to reach an oxygen concentration of 0.1% was measured.
(test results)
(1) In comparison with (2) no air discharge, the effect of shortening the temperature rise time from 15 ℃ at the storage temperature to the temperature under insecticidal conditions (30 ℃) from 58 hours to 17 hours, i.e., by 40 hours, is obtained in the cold spot comparison of the target substance storage container 2 when air is discharged from the target substance, as compared with the untreated target substance without air discharge. The time taken to reduce the oxygen concentration in the center of the package to 0.1% was different by about 2 hours.
(example 11)
The following experiments relating to the temperature rise confirmation test and the low oxygen concentration replacement confirmation test were carried out according to examples 8 and 9.
(means and conditions)
A processing cabinet; DAIKIN APPLIED SYSTEMS CO, LTD made hypoxia insecticidal device
A processing cabinet volume; about 6m3
Oxygen concentration of the treatment cabinet; 0.6 percent
Temperature inside the treatment cabinet (ambient temperature); 35 deg.C
An exhaust gas acceleration device; high-whisker industry manufactured turbine pipeline fan T-100 type
The exhaust amount of the exhaust accelerating device; measured 0.72m3Minute/min
Initial temperature of the subject substance: 15 deg.C
Tests were carried out under conditions of (1) exhausting air from the target substance (used in a T-100 type turbo duct fan manufactured by high-end industries), and (2) not exhausting air, as treatment conditions, using 0.2T (bulk density; 0.76kg/L) of pinellia ternata.
0.2t of cnidium officinale makino of the object substance 8 is contained in the flexible container of the object substance containing container 2.
The temperature measuring devices not shown are arranged at 6 places in total: the upper left front, the upper right front, the lower left front, the lower right front, and the center of the target material accommodating container 2.
The oxygen concentration measurement position, not shown, is disposed at the center 1 of the target substance container 2.
The arrangement position of the supply nozzle 4 is the same as in embodiments 8 and 9.
(test procedure)
The treatment cabinet 1 was replaced with a low oxygen concentration gas to 0.6%. As the gas collection supply mechanism of fig. 1 and the gas discharge mechanism of fig. 2, gas collection and gas discharge are performed at a ventilation rate of about 2.9 ventilation/minute based on the volume of the flexible container. The time required for each oxygen concentration measurement site to reach an oxygen concentration of 0.6% was measured.
(test results)
(1) In comparison with (2) no air discharge, the effect of shortening the temperature rise time from 15 ℃ at the storage temperature to the temperature under insecticidal conditions (30 ℃) from 78 hours to 13.5 hours, that is, 60 hours or more, is obtained in the cold spot comparison of the target substance storage container 2 when the target substance is discharged from the air and compared with the untreated target substance without air discharge. There was no difference in the time taken for the oxygen concentration in the center of the package to decrease to 0.6%.
Description of the reference numerals
1: a processing cabinet; 2: a target substance accommodating container; 3: a gas collection supply mechanism; 4: a supply nozzle; 5: a control unit; 6: an oxygen concentration adjustment unit; 7: a gas temperature adjusting part; 8: a target substance; 9: an exhaust mechanism; 10: a heating unit; 41: an unvented portion; 42: a ventilation part.
Claims (34)
1. A method of killing insects comprising the steps of:
a step of replacing the gas with a low oxygen concentration gas, in which the air in the closed space for storing the object substance, which is a plant or crude drug of 10kg or more, is replaced with an inert gas so that the oxygen concentration is 3% or less;
a gas temperature adjusting step of adjusting the temperature of the low oxygen concentration gas;
a substance temperature adjustment step of adjusting the temperature of the target substance to 30 ℃ or higher.
2. The pest killing method according to claim 1, wherein in the gas temperature adjusting step, the temperature of the low oxygen concentration gas is adjusted to 35 to 40 ℃.
3. The pesticidal method according to claim 1 or 2, wherein in the substance temperature adjustment step, the temperature of the target substance is made 30 ℃ or higher using a gas collection supply mechanism that collects the low oxygen concentration gas around the target substance and uniformly supplies the low oxygen concentration gas to the target substance.
4. The pesticidal method according to claim 1 or 2, wherein in the substance temperature adjustment step, the temperature of the target substance is made 30 ℃ or higher using an exhaust mechanism that uniformly supplies the low oxygen concentration gas to the target substance by actively exhausting the atmosphere around the target substance.
5. The pesticidal method according to claim 3 or 4, wherein the gas collection supply mechanism or the gas exhaust mechanism uses a supply nozzle that is inserted into the target substance and supplies the low oxygen concentration gas to the target substance at a required pressure.
6. The insecticidal method according to claim 5, wherein the supply nozzle has a ventilation section for supplying the low oxygen concentration gas to the subject substance, and the ventilation section uses a hole or a net to such an extent that the subject substance does not enter.
7. The insecticidal method according to claim 6, wherein the vent portion is provided at a front end of the supply nozzle.
8. The pesticidal method according to any one of claims 1 to 7, which blows the heated low oxygen concentration gas to the target substance by means of a blower equipped with a heating unit.
9. The pesticidal method according to any one of claims 1 to 8, which heats the target substance by using a device equipped with a heating unit.
10. The pesticidal method according to any one of claims 1 to 9, which has an oxygen concentration measurement step in which the oxygen concentration of the subject substance or the oxygen concentration around the subject substance is measured,
in the replacement step, the supply amount of the low oxygen concentration gas is adjusted in accordance with the oxygen concentration of the target substance or the oxygen concentration in the vicinity of the target substance.
11. The pesticidal method according to any one of claims 1 to 10, which has a temperature measurement step in which the temperature of the target substance or the surroundings of the target substance is measured,
In the gas temperature adjusting step, the temperature of the low oxygen concentration gas is adjusted in accordance with the temperature of the target substance or the temperature around the target substance.
12. The pesticidal method according to claim 10 or 11, wherein in the replacement step, the supply time of the inert gas is adjusted by the oxygen concentration measurement step.
13. The pest killing method according to claim 11 or 12, wherein in the gas temperature adjusting step, the temperature of the low oxygen concentration gas is adjusted by the temperature measuring step.
14. The pesticidal method according to any one of claims 11 to 13, wherein in the substance temperature adjustment step, a step time is adjusted by the temperature measurement step.
15. The insecticidal method according to any one of claims 1 to 14, wherein in the replacement step, the inert gas is flowed so that the enclosed space is a positive pressure compared with the outside of the enclosed space.
16. The insecticidal method according to any one of claims 1 to 15, wherein in the replacement step, inflow of the inert gas into the enclosed space and discharge of the low oxygen concentration gas out of the enclosed space are actively performed.
17. The pesticidal method according to any one of claims 1 to 16,
in the replacement step, a first sealed space and a second sealed space inside the first sealed space are provided in the sealed space, and the target substance is stored in the second sealed space,
flowing the inert gas into the second enclosed space,
the oxygen concentration of the low oxygen concentration gas in the second enclosed space is kept lower than the oxygen concentration in the first enclosed space.
18. The insecticidal method according to claim 17, wherein in the replacement step, the inert gas is flowed so that a pressure in the second closed space is a positive pressure compared with a pressure in the first closed space.
19. The pesticidal method according to any one of claims 1 to 18, wherein in the replacement step, an oxygen adsorption step of adsorbing oxygen in the closed space is provided.
20. The pesticidal method according to any one of claims 1 to 19, wherein the substance temperature adjustment step lasts for 3 days to 3 weeks.
21. An insecticidal device having at least one element selected from the group consisting of:
(a) a processing cabinet having a closed space;
(b) An oxygen concentration adjusting means for replacing air in the sealed space with an inert gas so that the oxygen concentration is 3% or less;
(c) a gas temperature adjusting unit for adjusting the temperature of the gas in the closed space;
(d) a breathable target substance container which is provided in the processing cabinet and can contain 10kg or more of a plant or a crude drug as a target substance;
(e) (i) a gas collection and supply mechanism that collects gas of low oxygen concentration around the target substance and uniformly supplies the low oxygen concentration gas to the target substance,
(ii) an exhaust mechanism that actively exhausts the atmosphere around the target substance to uniformly supply the low oxygen concentration gas to the target substance,
(iii) a blower equipped with a heating unit for heating the low oxygen concentration gas and blowing the low oxygen concentration gas to the subject matter, an
(iv) A device equipped with a heating unit for heating the object substance.
22. The insecticidal device according to claim 21, wherein the gas collection supply mechanism has a supply nozzle that is inserted into the subject substance and supplies the low oxygen concentration gas to the subject substance at a desired pressure.
23. The insect killing device according to claim 22, wherein the supply nozzle has a ventilation portion for supplying the low oxygen concentration gas to the target substance, and the ventilation portion uses a hole or a net to such an extent that the target substance does not enter.
24. The insecticidal device according to claim 23, wherein the vent portion is provided at a front end of the supply nozzle.
25. The insect killing apparatus according to any one of claims 21 to 24, comprising an oxygen concentration measuring means for measuring the oxygen concentration of the target substance or the oxygen concentration around the target substance.
26. The insecticidal device according to any one of claims 21 to 25, comprising a temperature measuring unit that measures the temperature of the target substance or the temperature around the target substance.
27. The insect-killing device according to claim 25 or 26, wherein said oxygen concentration adjusting means has means for adjusting said inert gas replacement time by said oxygen concentration measuring means.
28. The insect killing apparatus according to claim 26 or 27, wherein said gas temperature adjusting means has means for adjusting the temperature of said low oxygen concentration gas by said temperature measuring means.
29. The insect killing apparatus according to any one of claims 21 to 28, wherein the oxygen concentration adjustment means has means for flowing the inert gas so that the enclosed space is a positive pressure compared with the outside of the enclosed space.
30. The insect-killing device according to any one of claims 21 to 29, wherein the oxygen concentration adjustment means has means for actively performing the inflow of the inert gas into the enclosed space and the discharge of the low oxygen concentration gas.
31. The insecticidal device according to any one of claims 21 to 30,
the oxygen concentration adjustment means has:
a first closed space and a second closed space inside the first closed space are provided in the closed space, and the target substance is stored in the second closed space,
the inert gas is made to flow into the second closed space,
a unit in which the oxygen concentration of the low oxygen concentration gas in the second enclosed space is kept lower than the oxygen concentration in the first enclosed space.
32. The insecticidal device according to claim 31, wherein the oxygen concentration adjustment means has means for flowing the inert gas so that the pressure in the second closed space is positive compared with the pressure in the first closed space.
33. The insect killing device according to any one of claims 21 to 32, wherein the oxygen concentration adjusting means has means for adsorbing oxygen in the enclosed space.
34. The insecticidal device according to any one of claims 21 to 33, comprising means for maintaining the temperature of the target substance at 30 ℃ or higher for 3 days to 3 weeks.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021001591 | 2021-01-07 | ||
| JP2021-001591 | 2021-01-07 | ||
| JP2021198353A JP2022106655A (en) | 2021-01-07 | 2021-12-07 | Low-oxygen-concentration insecticidal method and apparatus for use in the same |
| JP2021-198353 | 2021-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114711204A true CN114711204A (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210015844.8A Pending CN114711204A (en) | 2021-01-07 | 2022-01-07 | Low oxygen concentration insecticidal method and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114711204A (en) |
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- 2022-01-07 CN CN202210015844.8A patent/CN114711204A/en active Pending
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