Method of evaporating medicine using incense sticks

Abstract

To allow effect of chemical to be obtained for a long time without incorporating large amount of chemical into an incense stick even in an environment where air changes a lot.SOLUTION: In a method, a first step of evaporating chemical such that the volume of chemical evaporation is two times or more of a reference volume of chemical evaporation, which is a volume of chemical evaporation in the case of uniformly kneading a predetermined volume of chemical into an incense stick 1 and a second step of evaporating chemical such that the volume of chemical evaporation is equal to or less than the volume of chemical evaporation in the first step, or not evaporating chemical are repeated a plurality of times.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to incense sticks used, for example, when exterminating pests, and a method for evaporating chemicals using incense sticks. [Background technology]

[0002] Mosquito coils have been known as this type of incense coil for some time. Patent Document 1 discloses that in a spiral-type mosquito coil, a single coil is alternately provided with an anthelmintic gas-generating section and a section that simply continues to burn but does not generate anthelmintic gas or a section that reduces the amount of anthelmintic drug. It also discloses that by alternately combining the anthelmintic gas-generating section with the section that does not generate anthelmintic gas or a section that reduces the amount of anthelmintic drug at intervals that are considered appropriate in terms of time, the gas concentration in the indoor air can be automatically adjusted even when the coil is burned continuously. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 53-17680 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when incense is burned in a room, the room may be ventilated frequently, creating an environment similar to that outdoors. Under such conditions, the concentration of the pesticide in the air tends to decrease, and opportunities for pests to invade are increased, so the pest extermination effect of ordinary incense is reduced. However, there is a demand for the effectiveness of the pesticide even under such conditions.

[0005] Therefore, it has been thought that increasing the concentration of the chemicals kneaded into the incense will increase the amount of chemicals evaporated per unit time, thereby increasing the efficacy of the chemicals. However, increasing the concentration of the chemicals kneaded into the incense requires a large amount of chemicals, which raises the problem of increasing the cost of the incense.

[0006] On the other hand, as a result of research by the present inventors, it has been found that it is not always necessary to maintain a high concentration of pesticide in the air to ensure its effectiveness. For example, it is generally unlikely that pests will continuously invade a room, and once the invading pests have been eradicated, it is possible that the pesticide concentration in the air can be low until the next infestation. It has also been found that there is no practical problem with extending this cycle to a certain extent.

[0007] On the other hand, the incense sticks in Patent Document 1 are constructed by alternating an anthelmintic gas-generating part with other parts, but since the purpose is to automatically adjust the gas concentration in the indoor air even when the incense sticks are burned continuously, it is assumed that they will be used in a closed room, and no consideration is given to the effectiveness of the pesticide in an environment with frequent air exchange. As such, the general environment in which incense sticks are used is a closed room, and the pesticide is only designed to be effective in that room, so the effectiveness of the pesticide may be significantly reduced in a room with frequent ventilation as described above.

[0008] The present invention was made in consideration of these points, and its purpose is to make it possible to obtain the effects of the medicine for a long period of time even in an environment with frequent air exchange, without having to contain a large amount of medicine in the incense stick. [Means for solving the problem]

[0009] To achieve the above objective, the amount of medicine evaporated is periodically increased to a predetermined amount or more while the incense is burning, thereby making it possible to obtain the effects of the medicine even in an environment with frequent air changes.

[0010] The first invention is a method for evaporating a chemical using incense, which comprises repeating a first step of evaporating the chemical so that the chemical evaporation amount is at least twice the standard chemical evaporation amount, which is the amount of chemical evaporation when a predetermined amount of the chemical is uniformly kneaded into an incense base material, and a second step of evaporating the chemical so that the chemical evaporation amount is lower than that of the first step, or not evaporating the chemical, multiple times, so that the maximum chemical concentration in the air when the incense is burning is at least 1.5 times the minimum chemical concentration.

[0011] That is, if the reference pesticide evaporation rate is set to the pesticide evaporation rate when a conventional incense stick used in a closed room is burned, for example, in an environment with high air exchange, the efficacy of the pesticide may be significantly reduced. In the present invention, the pesticide is evaporated in the first step to a pesticide evaporation rate at least twice the reference pesticide evaporation rate, so that the pesticide concentration in the air quickly increases even in an environment with high air exchange, thereby ensuring sufficient pesticide efficacy. Subsequently, in the second step, the pesticide is evaporated to a pesticide evaporation rate less than the reference pesticide evaporation rate, or no pesticide is evaporated at all, thereby reducing the total amount of pesticide used on the incense stick. Furthermore, since the first and second steps are repeated multiple times, even if a large amount of pesticide is expelled from the room due to air exchange, the pesticide is evaporated in the subsequent first step to a pesticide evaporation rate at least twice the reference pesticide evaporation rate, ensuring sufficient pesticide efficacy. This continues while the incense stick is burning, for example, for several hours or more. In addition, in the first step, the drug may be evaporated so that the amount of drug evaporated is 2.5 times or more the reference drug evaporation amount, or the drug may be evaporated so that the amount of drug evaporated is 3 times or more the reference drug evaporation amount.

[0012] A second invention is characterized in that the first step and the second step are repeated at least twice per hour.

[0013] According to this configuration, the cycle of evaporating the drug to a drug evaporation rate at least twice the reference drug evaporation rate, evaporating the drug to a drug evaporation rate less than the reference drug evaporation rate, or not evaporating the drug is repeated at least twice per hour, so that the drug can be sufficiently effective within a short time of less than one hour even with frequent air changes. The first and second steps may be repeated at least 2.5 times per hour, or may be repeated at least three times per hour.

[0014] A third invention is characterized in that the first step and the second step are repeated in a room where the ventilation rate is 8 times or more per hour.

[0015] According to this configuration, by evaporating the chemical so that the chemical evaporation rate is at least twice the reference chemical evaporation rate, the chemical concentration in the air quickly increases even in a room that is ventilated 8 times or more per hour, thereby ensuring sufficient chemical efficacy. The first and second steps may be repeated in a room that is ventilated 9 or 10 times per hour.

[0016] A fourth invention is characterized in that the agent is a pesticide.

[0017] With this configuration, if pests invade the room during air exchange, the pests can be exterminated by the pesticide. Also, while the incense is burning, there are periods when the pesticide is evaporated so that the amount of pesticide evaporated is less than the standard amount, or periods when the pesticide is not evaporated, so the concentration of the pesticide in the air in the room does not increase unnecessarily.

[0018] A fifth aspect of the present invention is characterized in that the pesticide contains at least one of dimefluthrin, mepafluthrin, prallethrin, d-allethrin, and d-trans-allethrin.

[0019] According to this configuration, by including at least one of dimefluthrin, mepafluthrin, prallethrin, d-allethrin, and d-trans-allethrin, a higher pest control effect can be obtained.

[0020] A sixth invention is characterized in that an incense stick is used in which the agent is applied to the incense stick base material.

[0021] This configuration allows the use of so-called coated incense sticks. The first step is performed by burning the part coated with the medicine, and the second step is performed by burning the part not coated with the medicine, making it possible to easily repeat the first and second steps.

[0022] The seventh invention is characterized in that incense containing a volatile chemical is configured to be capable of repeating multiple times a first step of evaporating the chemical so that the chemical evaporation amount is at least twice the reference chemical evaporation amount, which is the chemical evaporation amount when a predetermined amount of the chemical is uniformly kneaded into an incense base material, and a second step of evaporating the chemical so that the chemical evaporation amount is lower than that of the first step, or of not evaporating the chemical.

[0023] The eighth invention is characterized in that the incense stick base has a portion where the agent is applied to the incense stick base and a portion where the agent is not applied to the incense stick base.

[0024] A ninth invention is characterized in that the agent is applied to only one surface of the incense stick base material.

[0025] According to this configuration, it is possible to easily manufacture incense sticks having a portion where the agent is applied to the incense stick base material and a portion where the agent is not applied to the incense stick base material. [Effects of the Invention]

[0026] According to the present invention, the drug is evaporated so that the amount of drug evaporated is at least twice the standard drug evaporation amount, which is the amount of drug evaporated when a predetermined amount of drug is uniformly kneaded into the incense stick, and then the drug is evaporated so that the amount of drug evaporated is less than the standard drug evaporation amount, or the drug is not evaporated at all.This means that the drug effect can be obtained for a long period of time even in an environment with frequent air exchange without containing a large amount of drug in the incense stick. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a plan view of an incense stick according to an embodiment of the present invention. FIG. [Figure 2] FIG. 10 is a view corresponding to FIG. 1 according to a first modified example of the embodiment. [Figure 3] This is a diagram equivalent to Figure 1 showing an example in which medicine is applied to two incense sticks that are integrated together. [Figure 4] 1 is a graph showing the change in the amount of drug evaporated when incense sticks coated with dimefluthrin are burned. [Figure 5] 1 is a graph showing the change in the amount of mepafluthrin evaporated when an incense stick coated with mepafluthrin is burned. [Figure 6] 1 is a graph showing the change in the amount of drug evaporated when an incense stick coated with prallethrin is burned. [Figure 7] 1 is a graph showing the change in the amount of drug evaporated when an incense stick coated with allethrin is burned. [Figure 8] FIG. 1 is a side view of the test chamber. [Figure 9] FIG. 1 is a plan view of a test chamber. [Figure 10] This graph shows the change in air concentration when the applied area of ​​dimefluthrin was burned for 10 minutes and the unapplied area was burned for 10 minutes, and when the applied area was burned for 10 minutes and the unapplied area was burned for 20 minutes. [Figure 11] This graph shows the change in air concentration when the applied area of ​​dimefluthrin was burned for 5 minutes and the unapplied area was burned for 5 minutes, and when the applied area was burned for 5 minutes and the unapplied area was burned for 10 minutes. [Figure 12]This graph shows the change in air concentration when the coated area of ​​mepafluthrin was burned for 10 minutes and the uncoated area was burned for 10 minutes, and when the coated area was burned for 10 minutes and the uncoated area was burned for 20 minutes. [Figure 13] This graph shows the change in air concentration when the coated area of ​​mepafluthrin was burned for 5 minutes and the uncoated area was burned for 5 minutes, and when the coated area was burned for 5 minutes and the uncoated area was burned for 10 minutes. [Figure 14] This graph shows the change in air concentration when the applied area of ​​prallethrin is burned for 10 minutes and the unapplied area is burned for 10 minutes, and when the applied area is burned for 10 minutes and the unapplied area is burned for 20 minutes. [Figure 15] This graph shows the change in air concentration when the applied area of ​​prallethrin is burned for 5 minutes and the unapplied area is burned for 5 minutes, and when the applied area is burned for 5 minutes and the unapplied area is burned for 10 minutes. [Figure 16] This graph shows the change in air concentration when a coated area of ​​d-allethrin (0.3 wt%) was burned for 10 minutes and an uncoated area was burned for 10 minutes, and when a coated area was burned for 10 minutes and an uncoated area was burned for 20 minutes. [Figure 17] This graph shows the change in air concentration when a coated area of ​​d-allethrin (0.3 wt%) was burned for 5 minutes and an uncoated area was burned for 5 minutes, and when a coated area was burned for 5 minutes and an uncoated area was burned for 10 minutes. [Figure 18] This graph shows the change in air concentration when a coated area of ​​d-allethrin (0.9 wt%) was burned for 10 minutes and an uncoated area was burned for 10 minutes, and when a coated area was burned for 10 minutes and an uncoated area was burned for 20 minutes. [Figure 19] This graph shows the change in air concentration when a coated area of ​​d-allethrin (0.9 wt%) was burned for 5 minutes and an uncoated area was burned for 5 minutes, and when a coated area was burned for 5 minutes and an uncoated area was burned for 10 minutes. [Figure 20]This graph shows the change in air concentration when the coated area of ​​d-trans-allethrin was burned for 10 minutes and the uncoated area was burned for 10 minutes, and when the coated area was burned for 10 minutes and the uncoated area was burned for 20 minutes. [Figure 21] This graph shows the change in air concentration when the coated area of ​​d-trans-allethrin was burned for 5 minutes and the uncoated area was burned for 5 minutes, and when the coated area was burned for 5 minutes and the uncoated area was burned for 10 minutes. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0029] 1 is a plan view of an incense stick 1 according to an embodiment of the present invention. The incense stick 1 contains a volatile chemical and is configured so that the chemical vaporization method using the incense stick according to the present invention can be carried out simply by burning it. That is, the incense stick 1 is configured so that a first step of vaporizing the chemical so that the chemical vaporization amount is at least twice the reference chemical vaporization amount, which is the chemical vaporization amount when a predetermined amount of chemical is uniformly kneaded into an incense stick base material, and a second step of vaporizing the chemical so that the chemical vaporization amount is lower than that of the first step, or the chemical vaporization is not performed, can be repeated multiple times.

[0030] Specifically, the incense stick 1 is a spiral-shaped incense stick, having multiple sections 1a containing a chemical agent and multiple sections 1b not containing a chemical agent, with the sections 1a containing a chemical agent and the sections 1b not containing a chemical agent alternately arranged in the circumferential direction. As a result, when the incense stick 1 is burned, periods during which the chemical agent evaporates and periods during which the chemical agent does not evaporate alternate. The period during which the chemical agent evaporates can be determined by the length of the sections 1a containing a chemical agent and can be set, for example, between 5 and 20 minutes. The period during which the chemical agent does not evaporate can be determined by the length of the sections 1b not containing a chemical agent and can be set, for example, between 5 and 20 minutes. The lengths of the sections 1a containing a chemical agent and the sections 1b not containing a chemical agent may be the same, or one of the sections may be longer than the other. The burning time of the incense stick 1 is not particularly limited, but can be set, for example, to about 4 to 8 hours.

[0031] The chemical-containing portion 1a is formed by applying a liquid chemical to the incense stick base material. Since the incense stick base material has the property of absorbing the liquid chemical, the chemical is present not only on the surface of the incense stick base material but also in the surface layer of the incense stick base material. On the other hand, the chemical-free portion 1b is formed only from the incense stick base material. The incense stick base material contains at least a combustible combustion material such as wood powder, paper, or pulp, and a binder such as cornstarch to solidify the combustion material. The incense stick base material may also contain coloring agents, etc. The incense stick 1 may have, for example, a linear or rectangular shape.

[0032] If the incense stick 1 has a linear shape, the chemical-containing portion 1a and the chemical-free portion 1b are arranged alternately in the longitudinal direction. The cross-sectional shape of the incense stick 1 can be various shapes such as rectangular, circular, or elliptical. The chemical-containing portion 1a may be formed by kneading the chemical into the incense stick base material.

[0033] In this embodiment, a portion 1b that does not contain any chemicals is provided, but this portion may contain chemicals. In this case, the portion designated by reference symbol 1b can contain a smaller amount of chemicals than the portion designated by reference symbol 1a, and when the incense stick 1 is burned, periods in which a large amount of chemicals evaporates and periods in which a small amount of chemicals evaporate alternate.

[0034] In the modified embodiment shown in FIG. 2, the intervals at which the medicinal substance-containing portions 1a are arranged are wider than in the case shown in FIG. 1. The intervals at which the medicinal substance-containing portions 1a are arranged can be set arbitrarily, and may be equal or unequal intervals. Similarly, the intervals at which the medicinal substance-free portions 1b are arranged can be set arbitrarily. Furthermore, the intervals at which the medicinal substance-containing portions 1b are arranged, which are smaller in amount than the portions indicated by reference numeral 1a, can also be set arbitrarily. Furthermore, the number of medicinal substance-containing portions 1a in one incense stick 1 can be set arbitrarily. Similarly, the number of medicinal substance-free portions 1b in one incense stick 1 can be set arbitrarily. Furthermore, the number of medicinal substance-free portions 1b in one incense stick 1 can also be set arbitrarily.

[0035] FIG. 3 shows an example in which a chemical agent is applied to two incense sticks 1, 1 that are integrated together. By integrating the two incense sticks 1, 1, there is almost no gap between the incense sticks 1, 1, and in this state, the chemical agent can be applied linearly to the upper surface (also called the front surface) or lower surface (also called the back surface) of the incense sticks 1, 1, allowing the chemical agent to be applied to two incense sticks 1, 1 at once. The chemical agent may also be applied to the incense sticks 1 one by one. The position of the incense stick 1 when in use is not particularly limited, and it can also be used in a position in which the upper surface or lower surface extends vertically.

[0036] Any method may be used to apply the chemical to the incense stick 1, including, for example, dripping or dripping the chemical from above the incense stick 1, spraying, or applying with a brush. The chemical may be applied in any pattern to the top or bottom of the incense stick 1, including the linear pattern shown in FIG. 3, as well as dotted or wavy patterns. The chemical may be applied only to the top or bottom of the incense stick 1, or only to the bottom, or to both sides. The chemical may also be applied over a longer area toward the beginning of the incense stick 1's combustion. This allows the chemical to continuously evaporate for a predetermined period of time after the incense stick 1 begins to burn, improving its initial efficacy.

[0037] The agent may be, for example, a pesticide or various fragrances. Examples of pesticides include dimefluthrin, transfluthrin, allethrin, dl,d-T80-allethrin, dl,dT-allethrin, d,dT-allethrin, prallethrin, metofluthrin, mepafluthrin, lenofluthrin, empenthrin, pyrethrins, profluthrin, heptafluthrin, and tetraflumethrin. The pesticide may contain at least one of these. The agents described in the examples below may also be used.

[0038] When applying the chemical to the incense stick 1, a liquid form can be used. The liquid chemical contains the above-mentioned pesticide and a solvent. Examples of the solvent include normal paraffin such as Parasol 134, isoparaffin such as Isopar L, hexane, ethanol, water, etc., and any one or more of these can be used in combination. The solvent can be changed depending on the chemical.

[0039] (Amount of drug evaporated) The amount of chemicals evaporated when the incense stick 1 is burned can be defined as the amount (weight) of chemicals evaporated into the air per unit time. The amount of chemicals evaporated can be set arbitrarily depending on the amount of chemicals contained in the incense stick 1, and basically, the greater the amount of chemicals evaporated, the greater the amount of chemicals evaporated. In all of the comparative examples and examples shown below, the incense stick base material is the same, and contains, for example, wood powder, paper, pulp, cornstarch, etc. In the examples in which chemicals are applied, as described above, the chemicals dissolved in a solvent are applied with a brush or the like, but the amount of chemicals evaporated hardly changes depending on the application method.

[0040] Figure 4 is a graph showing the amount of chemical transpiration in Comparative Examples 1 and 2 and Examples 1 and 2. Comparative Example 1 is an incense stick formed by uniformly kneading dimefluthrin as a pesticide into an incense stick base material, a so-called kneaded incense stick. Dimefluthrin is present uniformly throughout the kneaded incense stick of Comparative Example 1. The amount of dimefluthrin contained in the incense stick of Comparative Example 1 is 0.03 wt%.

[0041] Comparative Example 2 is an incense stick in which dimefluthrin is uniformly applied over the entire upper surface of the incense stick base material, a so-called coated incense stick. Dimefluthrin is uniformly present over the entire upper surface of the coated incense stick of Comparative Example 2. The amount of dimefluthrin contained in the incense stick of Comparative Example 2 is 0.03 wt%.

[0042] As shown in Figures 1 and 2, Example 1 is a coated incense stick 1 in which chemical-containing portions 1a and chemical-free portions 1b are alternately arranged. Dimefluthrin is coated on the top surface of the chemical-containing portions 1a, but not on the chemical-free portions 1b. In the incense stick 1 of Example 1, dimefluthrin is present only on the top surface of the chemical-containing portions 1a. The lengths of the chemical-containing portions 1a and the chemical-free portions 1b are the same, and the burning time is 10 minutes. The number of chemical-containing portions 1a and the number of chemical-free portions 1b are also the same. 0.06 wt% dimefluthrin is present in the chemical-containing portions 1a. Therefore, the total amount of dimefluthrin in Example 1 is the same as in Comparative Examples 1 and 2.

[0043] Like Example 1, Example 2 is a coated incense stick 1 in which chemical-containing sections 1a and chemical-free sections 1b are alternately arranged. However, the length of the chemical-containing sections 1a is 10 minutes in terms of burn time, and the length of the chemical-free sections 1b is 20 minutes in terms of burn time. Furthermore, the number of chemical-containing sections 1a is the same as the number of chemical-free sections 1b. The chemical-containing sections 1a contain 0.09 wt% dimefluthrin. Therefore, the total amount of dimefluthrin in Example 2 is the same as that in Comparative Examples 1, 2, and Example 1. In other words, all incense sticks in Comparative Examples 1, 2, and Examples 1 and 2 contain the same amount of dimefluthrin. Comparative Example 1 is an example in which a predetermined amount of chemical is uniformly kneaded into the incense stick base material, and the chemical evaporation amount in Comparative Example 1 is used as the reference chemical evaporation amount. The method for measuring the chemical evaporation amount is a conventionally known method.

[0044] As can be seen from FIG. 4, in Comparative Examples 1 and 2, dimefluthrin is present throughout the incense stick 1, so the amount of drug evaporation is nearly constant from the start to the end of combustion. On the other hand, in Examples 1 and 2, the amount of drug evaporation is more than twice the reference amount of drug evaporation in Comparative Example 1. Furthermore, compared to Comparative Example 2, Examples 1 and 2 also have more than twice the amount of drug evaporation. This is because a high concentration of dimefluthrin is present in the drug-containing portion 1a, and when this drug-containing portion 1a is burned, a large amount of dimefluthrin is evaporated. This is the first step of the present invention.

[0045] Once the portion 1a containing the drug has finished burning, the portion 1b not containing the drug begins to burn. This is the second step of the present invention, the drug evaporation step. Since no dimefluthrin is present in the portion 1b not containing the drug, this is a step in which the drug does not evaporate. Note that a small amount of dimefluthrin may be present in the portion indicated by reference numeral 1b, in which case the drug will evaporate so that the amount of drug evaporated is lower than in the first step.

[0046] Figure 5 is a graph showing the amount of chemical transpiration in Comparative Examples 3 and 4 and Examples 3 and 4. Comparative Example 3 is a kneaded incense stick in which mepafluthrin as a pesticide is uniformly kneaded into an incense stick base material and molded. In the kneaded incense stick of Comparative Example 3, mepafluthrin is present uniformly throughout. The amount of mepafluthrin contained in the incense stick of Comparative Example 3 is 0.03 wt%.

[0047] Comparative Example 4 is a coated incense stick in which mepafluthrin is evenly applied over the entire upper surface of the incense stick base material. In this coated incense stick of Comparative Example 4, mepafluthrin is present evenly over the entire upper surface. The amount of mepafluthrin contained in the incense stick of Comparative Example 4 is 0.03 wt%.

[0048] Example 3 is a coated incense stick 1 in which chemical-containing portions 1a and chemical-free portions 1b are alternately arranged. Mepafluthrin is coated on the top surface of the chemical-containing portions 1a, but not on the chemical-free portions 1b. In the incense stick 1 of Example 3, mepafluthrin is present only on the top surface of the chemical-containing portions 1a. The lengths of the chemical-containing portions 1a and the chemical-free portions 1b are the same, and the burning time is 10 minutes. The number of chemical-containing portions 1a and the number of chemical-free portions 1b are also the same. 0.06 wt% mepafluthrin is present in the chemical-containing portions 1a. Therefore, the total amount of mepafluthrin in Example 3 is the same as in Comparative Examples 3 and 4.

[0049] Like Example 3, Example 4 is a coated incense stick 1 in which chemical-containing sections 1a and chemical-free sections 1b are alternately arranged. However, the length of the chemical-containing sections 1a is 10 minutes in terms of burn time, and the length of the chemical-free sections 1b is 20 minutes in terms of burn time. Furthermore, the number of chemical-containing sections 1a is the same as the number of chemical-free sections 1b. The chemical-containing sections 1a contain 0.09 wt% mepafluthrin. Therefore, the total amount of mepafluthrin in Example 4 is the same as that in Comparative Examples 3, 4, and Example 3. In other words, all incense sticks in Comparative Examples 3, 4, and Examples 3 and 4 contain the same amount of mepafluthrin. Comparative Example 3 is an example in which a predetermined amount of chemical is uniformly kneaded into the incense stick base material, and the chemical evaporation amount in Comparative Example 3 is used as the reference chemical evaporation amount.

[0050] As can be seen from Figure 5, in Comparative Examples 3 and 4, mepafluthrin is present throughout the incense stick 1, so the amount of chemical transpiration is approximately constant from the start to the end of combustion. On the other hand, in Examples 3 and 4, the amount of chemical transpiration is more than twice the reference amount of chemical transpiration in Comparative Example 3. Furthermore, compared to Comparative Example 4, Examples 3 and 4 have more than twice the amount of chemical transpiration. This is because a high concentration of mepafluthrin is present in the chemical-containing portion 1a, and a large amount of mepafluthrin transpire when this chemical-containing portion 1a is burned.

[0051] Once the portion 1a containing the drug has finished burning, the portion 1b not containing the drug begins to burn. Because no mepafluthrin is present in the portion 1b not containing the drug, this is a process in which the drug is not evaporated. Note that a small amount of mepafluthrin may be present in the portion marked 1b.

[0052] Fig. 6 is a graph showing the amount of chemical transpiration in Comparative Examples 5 and 6 and Examples 5 and 6. Comparative Example 5 is a kneaded incense stick in which prallethrin as a pest control agent is uniformly kneaded into an incense stick base material and molded. Prallethrin is present uniformly throughout the kneaded incense stick of Comparative Example 5. The amount of prallethrin contained in the incense stick of Comparative Example 5 is 0.1 wt%.

[0053] Comparative Example 6 is a coated incense stick in which prallethrin is evenly coated over the entire upper surface of the incense stick base material. Prallethrin is evenly present over the entire upper surface of the coated incense stick of Comparative Example 6. The amount of prallethrin contained in the incense stick of Comparative Example 6 is 0.1 wt%.

[0054] Example 5 is a coated incense stick 1 in which medicinal substance-containing portions 1a and medicinal substance-free portions 1b are alternately arranged. Prallethrin is coated on the upper surface of the medicinal substance-containing portions 1a, but prallethrin is not coated on the medicinal substance-free portions 1b. In the incense stick 1 of Example 5, prallethrin is present only on the upper surface of the medicinal substance-containing portions 1a. The length of the medicinal substance-containing portions 1a and the length of the medicinal substance-free portions 1b are the same, and the burning time is 10 minutes. The number of medicinal substance-containing portions 1a and the number of medicinal substance-free portions 1b are also the same. 0.2 wt% prallethrin is present in the medicinal substance-containing portions 1a. Therefore, the total amount of prallethrin in Example 5 is the same as in Comparative Examples 5 and 6.

[0055] Like Example 5, Example 6 is a coated incense stick 1 in which chemical-containing portions 1a and chemical-free portions 1b are alternately arranged, but the length of the chemical-containing portions 1a is 10 minutes in terms of burning time, and the length of the chemical-free portions 1b is 20 minutes in terms of burning time. The number of chemical-containing portions 1a is the same as the number of chemical-free portions 1b. The chemical-containing portions 1a contain 0.3 wt% prallethrin. Therefore, the total amount of prallethrin in Example 6 is the same as that in Comparative Examples 5, 6, and Example 5. In other words, all of the incense sticks in Comparative Examples 5, 6, and Examples 5 and 6 contain the same amount of prallethrin. Comparative Example 5 is an example in which a predetermined amount of chemical is uniformly kneaded into the incense stick base material, and the chemical evaporation amount in Comparative Example 5 is used as the reference chemical evaporation amount.

[0056] As can be seen from Figure 6, in Comparative Examples 5 and 6, prallethrin is present throughout the entire incense stick 1, so the amount of chemical transpiration is almost constant from the start to the end of combustion. On the other hand, in Examples 5 and 6, the amount of chemical transpiration is more than twice the reference amount of chemical transpiration in Comparative Example 5. Furthermore, compared to Comparative Example 6, Examples 5 and 6 also have more than twice the amount of chemical transpiration. This is because a high concentration of prallethrin is present in the chemical-containing portion 1a, and a large amount of prallethrin transpire when this chemical-containing portion 1a is burned.

[0057] Once the portion 1a containing the drug has finished burning, the portion 1b not containing the drug begins to burn. Because no prallethrin is present in the portion 1b not containing the drug, this is a process in which the drug is not evaporated. Note that a small amount of prallethrin may be present in the portion marked 1b.

[0058] Figure 7 is a graph showing the amount of chemical transpiration in Comparative Examples 7 and 8 and Examples 7 and 8. Comparative Example 7 is a kneaded incense stick in which allethrin as a pest control agent is uniformly kneaded into an incense stick base material and molded. Allethrin is present uniformly throughout the kneaded incense stick of Comparative Example 7. The amount of allethrin contained in the incense stick of Comparative Example 7 is 0.3 wt%.

[0059] Comparative Example 8 is a coated incense stick in which allethrin is evenly applied over the entire top surface of the incense stick base material. Allethrin is present evenly over the entire top surface of the coated incense stick of Comparative Example 8. The amount of allethrin contained in the incense stick of Comparative Example 8 is 0.3 wt%.

[0060] Example 7 is a coated incense stick 1 in which medicinal substance-containing portions 1a and medicinal substance-free portions 1b are alternately arranged. Allethlin is coated on the top surface of the medicinal substance-containing portions 1a, but not on the medicinal substance-free portions 1b. In the incense stick of Example 7, allethlin is present only on the top surface of the medicinal substance-containing portions 1a. The length of the medicinal substance-containing portions 1a and the length of the medicinal substance-free portions 1b are the same, and the burning time is 10 minutes. The number of medicinal substance-containing portions 1a and the number of medicinal substance-free portions 1b are also the same. The medicinal substance-containing portions 1a contain 0.6 wt% allethrin. Therefore, the total amount of allethrin in Example 7 is the same as in Comparative Examples 7 and 8.

[0061] Like Example 7, Example 8 is a coated incense stick 1 in which chemical-containing portions 1a and chemical-free portions 1b are alternately arranged, but the length of the chemical-containing portions 1a is 10 minutes in terms of burning time, and the length of the chemical-free portions 1b is 20 minutes in terms of burning time. The number of chemical-containing portions 1a is the same as the number of chemical-free portions 1b. The chemical-containing portions 1a contain 0.9 wt% allethrin. Therefore, the total amount of allethrin in Example 8 is the same as in Comparative Examples 7, 8, and Example 7. In other words, all of the incense sticks in Comparative Examples 7, 8, and Examples 7 and 8 contain the same amount of allethrin. Comparative Example 7 is an example in which a predetermined amount of chemical is uniformly kneaded into the incense stick base material, and the chemical evaporation amount in Comparative Example 7 is used as the reference chemical evaporation amount.

[0062] As can be seen from Figure 7, in Comparative Examples 7 and 8, allethrin is present throughout the incense stick 1, so the amount of drug evaporation is almost constant from the start to the end of combustion. On the other hand, in Examples 7 and 8, the amount of drug evaporation is more than twice the reference drug evaporation amount of Comparative Example 7. Furthermore, compared to Comparative Example 8, Examples 7 and 8 also have more than twice the amount of drug evaporation. This is because a high concentration of allethrin is present in the drug-containing portion 1a, and a large amount of allethrin is evaporated when this drug-containing portion 1a is burned.

[0063] Once the portion 1a containing the drug has finished burning, the portion 1b not containing the drug begins to burn. Since there is no allethrin in the portion 1b not containing the drug, this is a process in which the drug is not evaporated. Note that a small amount of allethrin may be present in the portion marked 1b.

[0064] (Airborne drug concentration) Next, the concentration of the chemical agent in the air when the incense stick 1 was burned will be described. The concentration of the chemical agent in the air was measured inside a test room 100 shown in FIGS. 8 and 9. The test room 100 was 2.5 m high, and 3.6 m wide and deep. As shown in FIG. 8, two exhaust fans 101, 101 were installed on the ceiling 100a. The exhaust fans 101, 101 were constantly operating to exhaust a predetermined amount of air from the test room 100. As shown in FIG. 9, windows 102, 102 were installed on the wall 100b. The windows 102, 102 were opened to a predetermined opening degree. The ventilation rate of the test room 100 could be changed by adjusting the opening degrees of the exhaust fans 101, 101 and the windows 102, 102. In the test described below, the exhaust fans 101, 101 were operated, and the opening degrees of the windows 102, 102 were set so that the ventilation rate of the test room 100 was 10 times per hour. A ventilation rate of 10 times per hour is similar to the outdoor conditions. Note that one ventilation rate is defined as the exchange of air in an amount equal to the volume of the test room 100 once per hour.

[0065] The incense stick 1, which is the test agent, is placed near the floor of the test chamber 100 so that it is in the center of the test chamber 100 in a plan view. The drug concentration in the air was measured using an air sampling pump 103 and a solid-phase extraction column 104. As shown in FIG. 8, the height of the upper solid-phase extraction column 104 from the floor was 1.5 m, and the height of the lower solid-phase extraction column 104 from the floor was 0.6 m. In a plan view, the distance between the solid-phase extraction column 104 and the test agent was 0.9 m. The air sampling pump 103 was a GL Sciences SP208-1000Dual. The solid-phase extraction column 104 was a GL Sciences InertSep 50 mg / 1 ml column. The room temperature of the test chamber 100 was set to 25°C.

[0066] 10 is a graph showing the measurement results of the drug concentration in the air for each of Comparative Examples 1 and 2 and Examples 1 and 2. The 90% repellency line shown by the two-dot chain line is the drug concentration at which the probability of mosquitoes being repelled is 90%, and at concentrations above this level, most mosquitoes can be repelled.

[0067] The concentration of the chemicals in the air while the incense stick 1 is burning changes as shown in Figure 10. The maximum concentration of the chemicals in the air while the incense stick 1 is burning is 1.5 times or more, preferably 2.0 times or more, of the minimum concentration of the chemicals. In addition, the maximum concentration of the chemicals in the air while the incense stick 1 is burning is 8.0 times or less, preferably 6.0 times or less, of the minimum concentration of the chemicals.

[0068] The time during which the concentration of the agent in the air maintains a repellency rate of 90% or more is 40% or more, preferably 45% or more, of the total burning time of the incense stick 1. The time during which the concentration of the agent in the air maintains a repellency rate of 90% or more is 60% or less, preferably 55% or less, of the total burning time of the incense stick 1.

[0069] The repellency rate is a rate indicating the degree to which the blood-sucking rate is reduced when treated with a drug compared to the blood-sucking rate when not treated, and is calculated, for example, by the following formula.

[0070] Repellency rate (%) = (CT) / C × 100 C: Blood-sucking rate in the untreated area (%) T: Blood feeding rate (%) in treatment area

[0071] The method for calculating the repellency rate will be explained in detail below. Mosquitoes were used as test insects. The test was carried out in a windless, thermostatic room of 8 tatami mats with an air exchange rate of 10 times / hour and the room temperature set to 28°C. The test substance (incense sticks) was placed in one corner of the thermostatic room, the test substance in the center, and the attractant (human) on the diagonal opposite the test substance. At the same time as the incense sticks were lit, the lid of the container containing 50 test insects was gently opened. The number of test insects that flew to bite the human was counted over time for 30 minutes after the test insects were released. The same survey was conducted on the untreated area, and the repellency rate (blood-feeding prevention rate) was calculated using the above formula.

[0072] Because the test room 100 is an environment with frequent air exchange, in Comparative Examples 1 and 2, the drug concentration in the air did not reach the concentration required for a 90% repellency. On the other hand, in Examples 1 and 2, the drug concentration in the air greatly exceeded the concentration required for a 90% repellency when the drug was evaporated in the first step. Therefore, the drug is sufficiently effective. Since the drug does not evaporate in the second step, the concentration falls far below the concentration required for a 90% repellency. However, in the subsequent first step, the drug evaporates to an amount more than twice the standard drug evaporation rate, and the drug concentration in the air greatly exceeds the concentration required for a 90% repellency. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0073] FIG. 11 is a graph showing the measurement results of the drug concentration in the air for Comparative Examples 1 and 2 and Examples 9 and 10. Example 9 is a coated incense stick similar to Example 1, except that the length of the drug-containing portion 1a is 5 minutes in terms of burning time, and the length of the drug-free portion 1b is 5 minutes in terms of burning time. Example 10 is a coated incense stick similar to Example 2, except that the length of the drug-containing portion 1a is 5 minutes in terms of burning time, and the length of the drug-free portion 1b is 10 minutes in terms of burning time. In Examples 9 and 10, the drug concentration in the air during drug evaporation in the first step far exceeds the concentration required for a 90% repellency, so the drug is sufficiently effective. In the second step, the drug does not evaporate, so the concentration falls far below the 90% repellency concentration. However, in the subsequent first step, the drug evaporates to a drug evaporation rate more than twice the standard drug evaporation rate, and the drug concentration in the air far exceeds the concentration required for a 90% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0074] 12 is a graph showing the measurement results of the drug concentration in the air for each of Comparative Examples 3 and 4 and Examples 3 and 4. In Examples 3 and 4, the drug concentration in the air greatly exceeds the concentration required for a 90% repellency rate when the drug evaporates in the first step, so the drug is sufficiently effective. In the second step, the drug does not evaporate, so the concentration falls far below the concentration required for a 90% repellency rate. However, in the subsequent first step, the drug evaporates to an amount more than twice the standard drug evaporation rate, so the drug concentration in the air greatly exceeds the concentration required for a 90% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0075] FIG. 13 is a graph showing the measurement results of the drug concentration in the air for each of Comparative Examples 3 and 4 and Examples 11 and 12. Example 11 is a coated incense stick similar to Example 3, but the length of the drug-containing portion 1a is 5 minutes in terms of burning time, and the length of the drug-free portion 1b is 5 minutes in terms of burning time. Example 12 is a coated incense stick similar to Example 4, but the length of the drug-containing portion 1a is 5 minutes in terms of burning time, and the length of the drug-free portion 1b is 10 minutes in terms of burning time. In Examples 11 and 12, the drug concentration in the air during drug evaporation in the first step far exceeds the concentration required for a 90% repellency, so the drug is sufficiently effective. Since the drug does not evaporate in the second step, the concentration falls far below the 90% repellency concentration. However, in the subsequent first step, the drug evaporates to a drug evaporation rate more than twice the standard drug evaporation rate, and the drug concentration in the air far exceeds the concentration required for a 90% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0076] 14 is a graph showing the measurement results of the drug concentration in the air for Comparative Examples 5 and 6 and Examples 5 and 6. In Example 5, the drug concentration in the air greatly exceeds the concentration required for an 80% repellency rate when the drug evaporates in the first step, and in Example 6, the drug concentration in the air greatly exceeds the concentration required for a 90% repellency rate when the drug evaporates in the first step, so the drug is sufficiently effective. Since the drug does not evaporate in the second step, the concentration falls far below the concentration required for an 80% repellency rate. However, in the subsequent first step, the drug evaporates to an amount of drug evaporation that is more than twice the reference drug evaporation rate. In Example 5, the drug concentration in the air greatly exceeds the concentration required for an 80% repellency rate, and in Example 6, the drug concentration greatly exceeds the concentration required for a 90% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0077] FIG. 15 is a graph showing the measurement results of the pesticide concentration in the air for each of Comparative Examples 5 and 6 and Examples 13 and 14. Example 13 is a coated incense stick similar to Example 5, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 5 minutes in terms of burning time. Example 14 is a coated incense stick similar to Example 6, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 10 minutes in terms of burning time. Even in Examples 13 and 14, the pesticide efficacy is sufficiently obtained because the concentration far exceeds the 80% repellency rate. Since the pesticide does not transpire in the second step, the concentration falls far below the 80% repellency rate. However, in the subsequent first step, the pesticide transpires to a pesticide transpiration rate more than twice the reference pesticide transpiration rate, and the pesticide concentration in the air far exceeds the 80% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0078] 16 is a graph showing the measurement results of the drug concentration in the air for Comparative Examples 7 and 8 and Examples 7 and 8. In Examples 7 and 8, the drug concentration in the air during drug evaporation in the first step greatly exceeds the concentration required for a repellent rate of 80%, so the drug is sufficiently effective. In the second step, the drug does not evaporate, so the concentration falls far below the concentration required for a repellent rate of 80%. However, in the subsequent first step, the drug evaporates to an amount of drug evaporation that is more than twice the reference drug evaporation rate, so that in Examples 7 and 8 the drug concentration in the air greatly exceeds the repellent rate of 80%, so that even if new mosquitoes invade, most of them can be repelled.

[0079] FIG. 17 is a graph showing the measurement results of the pesticide concentration in the air for each of Comparative Examples 7 and 8 and Examples 15 and 16. Example 15 is a coated incense stick similar to Example 7, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 5 minutes in terms of burning time. Example 16 is a coated incense stick similar to Example 8, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 10 minutes in terms of burning time. Even in Examples 15 and 16, the pesticide efficacy is sufficiently obtained because the concentration significantly exceeds the 80% repellency rate. Since the pesticide does not transpire in the second step, the concentration significantly falls below the 80% repellency rate. However, in the subsequent first step, the pesticide transpires to a pesticide transpiration rate more than twice the reference pesticide transpiration rate, and the pesticide concentration in the air significantly exceeds the 80% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0080] Figure 18 is a graph showing the measurement results of the pesticide concentration in the air for each of Comparative Examples 9 and 10 and Examples 17 and 18. Comparative Example 9 is a kneaded incense stick in which d-allethrin as a pest control agent is uniformly kneaded into an incense stick base material and molded. The amount of d-allethrin contained in the incense stick of Comparative Example 9 is 0.9 wt%. Comparative Example 10 is a coated incense stick in which d-allethrin is uniformly applied to the entire upper surface of the incense stick base material. The amount of d-allethrin contained in the incense stick of Comparative Example 10 is 0.9 wt%.

[0081] As shown in Figures 1 and 2, Example 17 is a coated incense stick 1 in which medicinal substance-containing portions 1a and medicinal substance-free portions 1b are alternately arranged. d-Allethrin is coated on the top surface of medicinal substance-containing portions 1a, but no d-Allethrin is coated on medicinal substance-free portions 1b. The lengths of medicinal substance-containing portions 1a and medicinal substance-free portions 1b are the same, and the burning time is 10 minutes. The number of medicinal substance-containing portions 1a and the number of medicinal substance-free portions 1b are also the same. The medicinal substance-containing portions 1a contain 0.6 wt% d-Allethrin. Therefore, the total amount of d-Allethrin in Example 17 is the same as in Comparative Examples 1 and 2.

[0082] Like Example 17, Example 18 is a coated incense stick 1 in which chemical-containing sections 1a and chemical-free sections 1b are alternately arranged, but the length of the chemical-containing sections 1a is 10 minutes in terms of burning time, and the length of the chemical-free sections 1b is 20 minutes in terms of burning time. Furthermore, the number of chemical-containing sections 1a is the same as the number of chemical-free sections 1b. The chemical-containing sections 1a contain 0.9 wt% d-allethrin. Therefore, the total amount of d-allethrin in Example 18 is the same as that in Comparative Examples 1 and 2 and Example 1.

[0083] In Examples 17 and 18, the drug concentration in the air during drug evaporation in the first step far exceeds the concentration required for a 90% repellency, ensuring sufficient drug efficacy. In the second step, the drug does not evaporate, resulting in a concentration far below the 90% repellency level. However, in the subsequent first step, the drug evaporates to an amount more than twice the standard drug evaporation rate, and in Examples 17 and 18, the drug concentration in the air far exceeds the 90% repellency level, ensuring that most mosquitoes are repelled, even if new mosquitoes invade.

[0084] FIG. 19 is a graph showing the measurement results of the pesticide concentration in the air for Comparative Examples 9 and 10 and Examples 19 and 20. Example 19 is a coated incense stick similar to Example 17, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 5 minutes in terms of burning time. Example 20 is a coated incense stick similar to Example 18, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 10 minutes in terms of burning time. In Examples 19 and 20, the concentration significantly exceeds the 90% repellency rate after about 20 minutes from the start of burning, thereby providing sufficient pesticide efficacy. Since the pesticide does not transpire in the second step, the concentration significantly falls below the 90% repellency rate. However, in the subsequent first step, the pesticide transpires to a pesticide transpiration rate more than twice the reference pesticide transpiration rate, and the pesticide concentration in the air significantly exceeds the 90% repellency rate. Therefore, even if new mosquitoes invade, most of them can be repelled.

[0085] Figure 20 is a graph showing the measurement results of the pesticide concentration in the air for each of Comparative Examples 11 and 12 and Examples 21 and 22. Comparative Example 11 is a kneaded incense stick in which d-trans-allethrin (EBT) as a pesticide is uniformly kneaded into an incense stick base material and molded. The amount of d-trans-allethrin contained in the incense stick of Comparative Example 11 is 0.3 wt%. Comparative Example 12 is a coated incense stick in which d-trans-allethrin is uniformly applied to the entire upper surface of the incense stick base material. The amount of d-trans-allethrin contained in the incense stick of Comparative Example 11 is 0.3 wt%.

[0086] As shown in Figures 1 and 2, Example 21 is a coated incense stick 1 in which medicinal substance-containing portions 1a and medicinal substance-free portions 1b are alternately arranged. d-trans-allethrin is coated on the upper surface of medicinal substance-containing portions 1a, but no d-trans-allethrin is coated on medicinal substance-free portions 1b. The lengths of medicinal substance-containing portions 1a and medicinal substance-free portions 1b are the same, and the burning time is 10 minutes. The number of medicinal substance-containing portions 1a and the number of medicinal substance-free portions 1b are also the same. The medicinal substance-containing portions 1a contain 0.6 wt% d-trans-allethrin. Therefore, the total amount of d-trans-allethrin in Example 21 is the same as in Comparative Examples 1 and 2.

[0087] Like Example 21, Example 22 is a coated incense stick 1 in which drug-containing sections 1a and drug-free sections 1b are alternately arranged, but the length of the drug-containing sections 1a is 10 minutes in terms of burning time, and the length of the drug-free sections 1b is 20 minutes in terms of burning time. Furthermore, the number of drug-containing sections 1a is the same as the number of drug-free sections 1b. The drug-containing sections 1a contain 0.9 wt% d-trans-allethrin. Therefore, the total amount of d-trans-allethrin in Example 22 is the same as in Comparative Examples 1 and 2 and Example 1.

[0088] In Examples 21 and 22, the drug concentration in the air during drug evaporation in the first step significantly exceeds the concentration required for a 90% repellency rate, approximately 30 minutes after the start of combustion, ensuring sufficient drug efficacy. In the second step, the drug does not evaporate, resulting in a concentration significantly below the 90% repellency rate. However, in the subsequent first step, the drug evaporates to an amount more than twice the standard drug evaporation rate, and in Examples 21 and 22, the drug concentration in the air significantly exceeds the 90% repellency rate. Therefore, even if new mosquitoes invade, most of them are repelled.

[0089] FIG. 21 is a graph showing the measurement results of the pesticide concentration in the air for each of Comparative Examples 11 and 12 and Examples 23 and 24. Example 23 is a coated incense stick similar to Example 21, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 5 minutes in terms of burning time. Example 22 is a coated incense stick similar to Example 22, except that the length of the pesticide-containing portion 1a is 5 minutes in terms of burning time, and the length of the pesticide-free portion 1b is 10 minutes in terms of burning time. In Examples 23 and 24, the pesticide concentration significantly exceeds the 80% repellency rate approximately 10 minutes after the start of burning, thereby achieving sufficient pesticide efficacy. Since the pesticide does not transpire in the second step, the pesticide concentration in the air is lower than in the first step. However, in the subsequent first step, the pesticide transpiration rate is more than twice the reference pesticide transpiration rate, and the pesticide concentration in the air significantly exceeds the 80% repellency rate, thereby repelling most mosquitoes, even if they newly invade.

[0090] Furthermore, the test results for the drug concentration in the air mentioned above were obtained under conditions where the ventilation rate was 10 times, but the same tendency was observed even if the ventilation rate was 8 or 9 times.

[0091] (Action and effect) As described above, according to the incense stick 1 and the method for evaporating a chemical using the incense stick 1 according to this embodiment, the chemical is evaporated in the first step to a chemical evaporation rate at least twice the reference chemical evaporation rate. Therefore, even in an environment with high air exchange rates, the chemical concentration in the air quickly increases, thereby ensuring sufficient chemical efficacy. Then, in the second step, the chemical is evaporated to a chemical evaporation rate less than the reference chemical evaporation rate, or the chemical is not evaporated at all. This reduces the total amount of chemical used on the incense stick 1. Furthermore, because the first and second steps are repeated multiple times, even if a large amount of chemical is expelled from the room due to air exchange, the chemical is evaporated in the subsequent first step to a chemical evaporation rate at least twice the reference chemical evaporation rate, ensuring sufficient chemical efficacy. This process continues while the incense stick is burning, for example, for several hours or more. Therefore, the chemical effect can be obtained over a long period of time, even in an environment with high air exchange rates, without requiring the incense stick 1 to contain a large amount of chemical.

[0092] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0093] As described above, the incense stick and the method for evaporating medicine using the incense stick according to the present invention can be used, for example, in a room with a high ventilation rate or in an environment similar to the outdoors. [Explanation of symbols]

[0094] 1. Incense

Claims

1. In the method of evaporating medicine using incense sticks, The drug contains at least one of dimefluthrin, mepafluthrin, prallethrin, d-allethrin, and d-trans-allethrin, a first step of evaporating the chemicals into the air so that the chemical evaporation rate is at least twice the reference chemical evaporation rate, which is the chemical evaporation rate into the air per unit time when the same amount of chemicals as the total amount used in the incense is uniformly kneaded into an incense base material; and a second step of evaporating the chemicals into the air so that the chemical evaporation rate is lower than that of the first step, or not evaporating the chemicals, multiple times in a room with an air change rate of 8 times or more per hour. The time for the first step and the time for the second step are each set to 5 minutes or more and 20 minutes or less, A method for evaporating a drug, characterized in that the maximum drug concentration in the air when the incense is burning is 1.5 times or more the minimum drug concentration.

2. The method for evaporating a drug according to claim 1, A method for evaporating a chemical, characterized by using an incense stick in which the chemical is applied to the incense stick base material.

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