ITTO20080251A1 - STEAMING METHOD. - Google Patents

Description

DESCRIPTION of the industrial invention entitled: "Method of vaporization",

BACKGROUND DESCRIPTION OF THE INVENTION

Technical field

The present invention relates to methods for the vaporization of pest control components by hot vaporization from pest control means by hot vaporization.

Background technique

A means of controlling pests by hot steaming is generally called an "electric mosquito repellent pad". For example, the conventional hot steaming means described in patent documents 1 and 2 each comprise: a plate support having an approximately rectangular shape in plan view; and a bag-like body that wraps the support so as to enclose it between its two sides. The holder contains a pest control component. In the pouch body, one or more openings are formed. In conventional means for hot steaming, the carrier is heated to vaporize the pest control component contained in the carrier into the atmosphere through the opening (s) of the pouch body.

Patent Document 1 Publication of Japanese Unexamined Patent Application No.

2003-201205.

Patent Document 2 Japanese Unexamined Patent Application Publication No., 2004-339209.

SUMMARY OF THE INVENTION

Problems to be solved with the invention

In each of the aforementioned pest control means by hot vaporization, the vaporized amount of the pest control component is adjusted, thus allowing for repeated and long-lasting use. However, when each of the above means for the control of pests by hot vaporization has been used with a conventional vaporization method, the vaporized amount of the pest control component immediately after the start of use remains deficient, which can make it impossible to achieve a sufficient pest control effect,

It was therefore desired to stabilize the vaporized amount of the pest control component from immediately after the start of use to the latter part of the use period.

Problem solving

The present invention provides a method of steaming by heating a pest control means by hot steaming, comprising a plate support and a pouch body that wraps the support, on one side of the support, thereby vaporizing the component. control of harmful insects by hot vaporization contained in the support on the other side of the support itself through an opening formed in the bag-like body, the vaporization method being characterized by maintaining the support in a condition in which it is pressed on the other side side while warming up.

The present invention always preferably employs the following aspects.

(I) The pressure force is adjusted to apply a pressure of 10 to 200 g / cm <2> to the media.

(II) The pressure force is adjusted to apply a pressure of 20 to 150 g / cm <2> to the media.

(III) The support is pressed using a pressing tool which prevents opening and exerts pressure on the support at least in one point.

(IV) The thickness of the substrate is 0.2 to 5.0mm.

(V) The support is made of fibrous material and has a bulk density of 0.2 to 0.7 g / cm <2>.

(VI) The pest control component by hot vaporization is a compound represented by the following formula (1):

(where R <1> and R <2> each represent a hydrogen atom, a methyl group or a chlorine atom, and R <3> represents a hydrogen atom, a fluorine atom, a methyl group, a methoxy or a methoxymethyl group).

(VII) The compound in entry (VI) is:

2.3.5.6-tetrafluoro-4-methoxymethylbenzyl-3- (1-propenyl) -2, 2-dimethylcyclopropanecarboxylate;

2.3.5.6-tetrafluoro-4-methylbenzyl-3 - (1-propenyl) -2,2-dimethylcyclopropanecarboxylate;

2.3.5.6-tetrafluorobenzyl-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate;

2.3.5.6-tetrafluoro-4-methoxymethylbenzyl-3- (2-methyl-1-propenes1) -2,2-dimethylcyclopropanecarboxylate; or

2.3.4.5.6-pentafluorobenzyl-3 - (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate.

(VIII) The pest control component by hot vaporization is used to impregnate the substrate in the form of a solution in an ester based solvent having a boiling point of 200 ° C or more.

(IX) The ester-based solvent of heading (VIII) is acetylcitrate.

(X) Acetyl citrate in heading (IX) is triethyl acetyl citrate.

Another invention provides a pest control method characterized by carrying out insect control using the vaporization method of the present invention.

Effects of the invention

In the present invention, the support is maintained in a condition where it is pressed on the other side thereof during the period of use and then the pest control component which is steamed hot which is contained in the support is easily ejected from the support. same. Hence, the vaporized amount of pest control component will not be scarce just after the start of use; furthermore, even in the latter part of the use period during which the amount of hot vaporized pest control component contained in the carrier is reduced, the vaporized amount of hot steamed pest control component will not decrease. . Also, the vaporized amount of the pest control component that is hot vaporized per unit of time will not be uneven. Therefore, in the vaporization method of the present invention, the stable pest control effect can be obtained from immediately after the start of use and also in the latter part of the period of use.

According to the preceding aspect (I), since a pressure of 10 g / cm <2> or more is applied to the support, the above described effects of the present invention can be obtained with certainty. In addition, since a pressure of 200 g / cm <a> or less is applied to the substrate, the oozing of the pest control component from evaporating hot can be prevented with certainty.

According to the preceding aspect (II), since a pressure of 20 g / cm <a> or more is applied to the support, the above-described effects of the present invention can be obtained with greater certainty. In addition, because a pressure of 150 g / cm <a> or less is applied to the substrate, the oozing from the substrate of the pest control component by evaporating heat can be safely prevented.

According to the previous aspect (III), the above described effects of the present invention can be obtained with certainty. Furthermore, since the support is pressed while preventing it from opening, vaporization of the pest control component by the pest control means by hot steaming can be prevented from being prevented by the pressing tool.

According to the previous aspect (IV), the support can be pressed with an optimal force.

According to the preceding aspect (V), the above described effects of the present invention can be obtained more easily.

According to the preceding aspect (VI) or (VIII), the above described effects of the present invention can be effectively achieved.

According to the foregoing aspect (VII) or (IX), the above-described effects of the present invention can be achieved more effectively.

According to the preceding aspect (X), the aforementioned effects of the present invention can be effectively achieved.

According to another invention, the pest control effect of the vaporization method of the present invention can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a perspective view showing a condition in which a vaporization method according to a first embodiment of the present invention is implemented.

Figure 2 is an enlarged partial perspective view showing the condition before a hot steamed object is placed on a heating part of a heating device according to the first embodiment.

Figure 3 is a plan view of the heating part of Figure 1.

Figure 4 is a cross-sectional view taken along the arrows IV-IV of Figure 3.

Figure 5 is a cross-sectional view taken along the arrows V-V of Figure 3.

Figure 6 is a perspective view showing the hot vaporization medium according to the first embodiment.

Figure 7 is a perspective view of the support of Figure 6.

Figure 8 is a plan view of the hot vaporization medium of Figure 6.

Figure 9 is a cross-sectional view taken along arrows IX-IX of Figure 8.

Figure 10 is a cross-sectional view taken along the arrows X-X of Figure 8.

Figure 11 is a perspective view showing a step of a method for manufacturing the hot vaporization medium of Figure 6.

Figure 12 is a perspective view showing a step subsequent to Figure 11.

Figure 13 is a perspective view of a test device.

DETAILED DESCRIPTION OF THE FAVORITE REALIZATIONS

First realization

{1) Heating device

Figure 1 is a perspective view showing a condition in which a vaporization method according to the present invention is realized. The vaporization method of the present invention is performed using a heating device 7 illustrated in Figure 1. The heating device 7 has a heating part 71 and uses the heating part 71 to heat a pest control medium by hot vaporization (hereinafter referred to as referred to as "hot vaporization medium") 1, disposed on the heating part 71. Figure 2 is an enlarged partial perspective view showing the condition before the hot vaporization medium 1 is placed on the heating part 71. The heating part 71 has a heating plate 712 on the bottom surface of a concave portion 711 which, seen in plan, is rectangular, and heats the hot vaporization medium 1 placed on the heating plate 712 through the heating plate 712.

Furthermore, in the present invention, the heating part 71 is equipped with a pressing tool 8. In Figure 1, the hot vaporization medium 1 is pressed onto the heating plate 712 by means of the pressing tool 8. In Figure 2, the pressing tool 8 is withdrawn. Figure 3 is a plan view of the heating part 71 of Figure 1. Figure 4 is a cross-sectional view taken along the arrows IV-IV of Figure 3, and Figure 5 is a cross-sectional view taken along the arrows V-V of figure 3.

The total pressure 8 comprises two pressure arms 80. The pressure arms 80 each comprise a main body 81 of the arm, a pivot portion 82 and an engaging portion 83. The main bodies of the arm 81 are each such that they can be extended. beyond the heating part 71 in the direction of its width. A base end 811 of each arm main body 81 is supported on the pivot portion 82 and a front end 812 of each arm main body 81 is formed to engage with the engaging portion 83. Thus, each main body of arm 81 can be pivoted up and down about a horizontal axis using the pivot portion 82 as a hinge. Further, each main arm body 81 has a convex pressing portion 813 at the lower surface of its longitudinal center. As the main bodies 81 of the arm are rotated to engage the front end 812 with the engaging portions 83, the convex pressing pressures 813 apply pressure from above against the hot vaporization medium 1 located on the heating plate 712. Thus, the hot vaporization means 1 is pressed by two pressing arms 80, i.e. the pressing arm 8 with a predetermined force.

{2) Medium 1 of hot vaporization

In practice, the hot vaporization medium 1 has the following structure.

Figure 6 is a perspective view showing the hot vaporization medium 1. The hot vaporization means 1 comprises: a plate support 2 and a bag-like body 3 that wraps the support 2. Figure 7 is a perspective view of the support 2, Figure 8 is a plan view of the vaporization means a 1, Figure 9 is a cross section taken along the arrows IX-IX of Figure 8 and Figure 10 is a cross section taken along the arrows X-X of Figure 8.

(2-1) Basic structure

(2-1-1) Support 2

The support 2 has an oblong shape in the plan view. It should be noted that the support 2 can have a rectangular or approximately rectangular shape in addition to the oblong shape.

Media size 2 is normally as follows: 10mm to 20mm in length for 30 min to 40mm wide by 0.2mm to 5.0mm thick. It should be noted that the dimensions of the support 2 can be determined appropriately depending on the dimensions of the heating part 71 of the device 7 using the support 2.

Support 2 contains a heat-vaporizable pest control component (hereinafter referred to as "pest control component"). The support 2 is of such shape that it can hold the pest control component, and moderately vaporize this insect control component when heated. The holder 2 has a heated surface (back side) 21 and a vaporization surface (front side) 22, and can vaporize the pest control component from the vaporization surface 22 which is heated by the heated surface 21.

The support 2 is provided, in a central position in the plan view of the vaporization surface 22, with an indicator (indicating means) 23. The indicator 23 functions by indicating the dissipation of the pest control component contained in a central portion , plan view, of the vaporization surface 22.

(2-1-2) Bag body 3

The pouch body 3 comprises the films 31. The pouch body 3 has a shape such as to enclose the two sides of the support 2 between its two films 31 as seen in Figures 9 and 10, and the two films 31 are connected ( at a connection point 33) along the peripheral edge of the support 2 as illustrated in Figure 8. Therefore, the bag-like body 3 wraps the support 2 so as to enclose it between its two sides. The support 2 is virtually non-displaceable in 4 directions in the plane seen from the inside of the pouch body 3. Between the vaporization surface 22 of the support 2 and the film 31, and between the heated surface 21 of the support 2 and the film 31 there is no there is or almost no space. The thickness of each film 31 is not particularly limited but is normally from 0.0001 mm to 5 mm and preferably from 0.001 mm to 2 mm.

The films 31 which make up the pouch body 3 are impermeable to the pest control component. In other words, the films 31 each have the property of substantially not allowing vapor permeation from the pest control component. "They essentially do not allow permeation" means that the permeation of a quantity of pest control component that affects insect control is not possible, and more specifically means an "impermeability" to which not a single mosquito is killed even during a exposure of 30 minutes of observation when examining the insect control effect in the same way as test 1 which will be mentioned below with the entire surface of support 2 covered with films 31. The films 31 each preferably have resistance to heat so as to prevent breakage or melting, for example, which causes the support 2 to be exposed to a temperature of use of the hot vaporization medium 1 (for example between about 50 ° C and about 200 ° C) and during its period of use (for example about 100 hours or more}.

As can be seen in Figure 8, the bag-like body 3 has a vaporization surface facing the region A which faces the vaporization surface 22 of the support 2. Furthermore, in the region A facing the vaporization surface, three openings 41. The openings 41 are holes which pass through the film 31.

In the region facing the vaporization surface A, each of the three apertures 41 is in a position (hereinafter referred to as the "peripheral position") displaced from the central position of the plan view (hereinafter referred to as the "central position") of the surface 22 of the support 2 wrapped in the bag-like body 3. In other words, none of the three openings 41 is located in the central part of the vaporization surface 22. It can be noted that, as seen in Figure 8, the central position of the surface of vaporization 22 corresponds to the position of an intersection point C of two diagonal lines of the vaporization surface 22.

The position of the three openings 41 is symmetrical in the plan view. Specifically, the three openings 41 are each at a corner of an isosceles triangle S, the isosceles bottom side S being parallel to one side of the region A facing the vaporization surface and one of the openings 41 is located in the longitudinal center of the region A facing the vaporization surface.

The total opening area of the three openings 41 is between 3% and 10%, preferably between 4.8 and 7.9% of the area of the vaporization surface 22 of the support 2.

(2-2) Manufacturing method

The hot vaporization medium 1 with the above structure is manufactured as follows. First, a bag 30 open on one side is prepared as seen in Figure 11. Then a support 2 is inserted into the bag 30 through the opening 301 of the bag 30. Then, as seen in Figure 12, with the support 2 inserted inside the bag 30, the opening 301 is sealed as indicated by the line X, and the excess portion 302 is cut out. Sealing is performed by, for example, thermal welding, ultrasonic welding, high frequency welding and / or an adhesive. It can be seen that the bag 30 to be prepared comprises a film 31. Furthermore, in predetermined positions of a vaporization surface facing the region A of the bag 30, three openings 41 are formed. Furthermore, the internal width W of the bag 30 has a dimension that allows the substantially precise insertion of the support 2.

(2-3) Detailed composition

As the material constituting the support 2, a fibrous material, a porous material or the like can be used. Specifically, materials which may be used as a fibrous material include, for example, the following:

- natural fiber such as wood pulp, cellulose and cotton

- synthetic fiber such as polyester and acrylic fibers

- inorganic fiber such as glass fiber and asbestos

On the other hand, materials which can be used as a porous material include, for example, the following materials:

porous inorganic substance such as diatomaceous earth

- porous magnetic substance such as unglazed tableware

- porous resin such as expanded urethane and expanded polypropylene

If the support 2 is formed of fibrous material, the support 2 preferably has a density of 0.2 to 0.7 g / cm <3>.

As a pest control component, a pyrethroid-based heat vaporizable compound can be used, and preferably a tetrafluorobenzyl ester compound represented by the following general formula (1) can be used:

(where R <1> and R <2> each represent a hydrogen atom, a methyl group or a chlorine atom, and R <3> represents a hydrogen atom, a fluorine atom, a methyl group, a methoxy or a methoxymethyl group).

Compounds which can be used as the tetrafluorobenzyl ester compound include, for example, the following compounds:

2,3,5,6-tetrafluoro-4-methoxymethylbenzyl-3- (1-propenyl) -2,2-dimethylcyclopropanecarboxylate 2.3.5.6-tetrafluoro-4-methylbenzyl-3- (1-propenyl) -2, 2-dimethylcyclopropanecarboxylate

2,3,5,6-tetrafluorobentii-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate

2.3.5.6-tetrafluoro-4-methoxymethylbenzyl-3- (2-methyl-1-propenyl) -2,2-dimethylcyclopropanecarboxylate

- 2,3,5,6-tetrafluoro-4-methoxybenzyl-3- (1-propenes1) -2, 2-dimethylcyclopropanecarboxylate

- 2,3,5,6-tetrafluoro-4-methoxybenzyl-3- (2-methyl-1-propenyl) -2, 2-dimethylcyclopropanecarboxylate.

The pest control component content in support 2 is normally about 0.001 g to about 1 g per cm 3 of support. It should be noted that the content can be suitably determined according to the material (s) constituting the support 2, the desired duration of the pest control effect and the type of pest control component *

In addition to the pest control component, the support 2 may contain a solvent, a dye, an antioxidant, a synergistic product, a stabilizer and / or a perfume, for example, when it is deemed necessary.

For example, usable solvents include: a normal paraffin-based solvent; an isoparaffin-based solvent; a naphthene-based solvent; an ester-based solvent; a ketone-based solvent; an ether-based solvent; and an alcohol-based solvent. These solvents can be used alone or in the form of a mixture of two or more types. In particular, substances which can be preferably used as an ester-based solvent include: palmitates such as isopropyl palmitate; adipate such as dioctyl adipate; sebacate such as dibutylsebacate; acetyl citrate such as tributyl acetyl citrate and triethyl acetyl citrate; maleate such as di- (2-ethylhexyl) maleate; and myristate as isopropyl myristate and, among these, acetyl citrate is used with particular preference.

As a dye, an anthraquinone-based blue dye or similar can be used. Compounds which may be used as anthraquinone-based blue dyes include, for example, the following compounds:

- 1,4-dibutylaminoantraquinone

- 1,4-diisopropylaminoantraquinone

- 1,4-bis (2,6-diethyl-4-methylphenylamino) anthraquinone

- 1-methylamino-4-orthotolylaminoanthrachinone - 1-methylamino-4-metatholylaminoantraquinone - 1-methylamino-4-paratolylaminoantraquinone say a mixture with another dye having a different color.

As an antioxidant, a phenol-based antioxidant or the like can be used. Compounds which may be used as a phenol-based antioxidant include, for example, the following compounds:

- dibutylhydroxytoluene

- butylhydroxyanisole

- 2,2-methylenebis (4-methyl-6-tert-butylphenol) - 2,6-di-t-butyl-4-methylphenol

2- [1- (2-hydroxy-3,5-di-tert-pentylphenyl) ethyl] -4,6-di-tert-pentylphenylacrylate

- 3,9-bis [2,3- {3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy-1,1-dimethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane.

Compounds which may be used as a synergistic product include, for example, the following compounds:

- bis- (2,3,3,3-tetrachloropropyl) ether (S-421) - N- {2-ethylhexyl) bicyclo [2.2.1] hept-5-en-2,3-dicarboximide (MGK264)

a- [2- {2-butoxyethoxy) ethoxy] -4,5-methylenedioxy-2-propyltoluene (PBO)

As a stabilizer, an ultraviolet absorbent or the like can be used. As an ultraviolet absorbent, for example, an ultraviolet absorbent based on benzotriazole, an ultraviolet absorbent based on benzophenone, or the like can be used.

The pest control component can be impregnated into the carrier 2 as such or in the form of a solution in the above solvents. Thereby, the pest control component is introduced into the holder 2.

Indicator 23 can be formed, for example, as follows:

- Support 2 can contain a dye. Discoloration of the dye indicates dissipation of the pest control component {for reference see the publication of the examined Japanese Patent Application No. 46-24277).

- The support 2 can contain a vaporizable acid or a vaporizable base, and a pH indicator. The discoloration of the pH indicator indicates the dissipation of the insect control component (for reference see Japanese Unexamined Patent Application Publication No. 56-53461).

- In one of the constituents of the support 2 an acid or a vaporizable base can be introduced, and a pH indicator, and the constituent material is applied to the vaporization surface 22 of the support 2. The discoloration of the pH indicator indicates the dissipation of the pest control component (for reference see Japanese Unexamined Patent Application Publication No. 56-53461).

- A colored electron donor organic compound and a developer can be added to the support 2. Their discoloration indicates the dissipation of the pest control component (for reference see Japanese Unexamined Patent Application Publication No.

63-60901).

- An electron-donating colored organic compound and a developer can be added to a constituent material of the support 2, and the constituent material is applied to the vaporization surface 22 of the support 2. Its discoloration indicates the dissipation of the pest control component (For reference see Japanese Unexamined Patent Application Publication No. 63-60901).

- A special paper or resin is used to form the support 2. The special paper or resin has, in part or on its entire surface, a colored base layer having a low refractive index compared to that of light. The color change of the base colored layer indicates the dissipation of the insect control component (for reference see Japanese Unexamined Patent Application Publication No. 8-73301).

- A special paper or resin is impregnated with a solvent, and the special paper or resin is applied to the vaporization surface 22 of the support 2. The special paper or resin has, in part or on its entire surface, a colored layer base having a low refractive index compared to that of light. The color change of the base color layer indicates the dissipation of the pest control component (for reference see Japanese Unexamined Patent Application Publication No. 8-73301).

Materials which can be used to form the films 31 of the pouch body 3 include, for example, the following:

metals such as iron, nickel, chromium, zinc, molybdenum, titanium, copper, aluminum, tin, lead, silver, platinum and gold

- polyolefin such as polyethylene and polypropylene - polyacrylonitrile

copolymer such as ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer and ethylene-ethyl acrylate copolymer.

- polyamide such as nylon

- polyimide

- polyester such as polyethylene terephthalate and polybutylene terephthalate

- polyphenylene oxide

- polyether as polyether sulfone

plastics such as fluorinated resin, including polytetrafluoroethylene

The films 31 can each be formed with a composite material in which the above products are combined, or it can be a multilayer structure in which two or more layers formed by the above materials are superimposed. Alternatively, to ensure strength, heat resistance and adhesion properties, for example, the films 31 may each be a multilayer structure in which a layer consisting of a material (e.g. paper) highly permeable to the pest control component is stacked on a layer consisting of the aforementioned material. Furthermore, in terms of heat resistance and workability, for example, it is preferable to use a multilayer structure formed by: a layer consisting of the aforementioned metal; and a layer consisting of the aforementioned resin. In particular, it is preferable to use a multilayer structure formed by an aluminum layer and a layer consisting of the following resin (resins). Usable resins include: polyolefins such as polyethylene and polypropylene; polyamides such as nylon; polyimide; polyester such as polyethylene terephthalate and polybutylene terephthalate; polyphenylene oxide; and polyether as polyether sulfone.

(2-4) Editable structure

In the bag 30 used to manufacture the hot vaporization medium 1, the openings 41 need not necessarily be formed. In other words, the openings 41 can be formed on the vaporization surface facing the region A after the support 2 has been wrapped in the bag-like body 3.

The pouch body 3 can be manufactured, for example, by the following method (methods):

- A method of applying the film (films) 31 to both surfaces 21, 22 of the support 2 by thermal welding, ultrasonic welding, high frequency welding and / or with an adhesive.

A method of forming the resin film (s) 31 on both surfaces of the support 2 using a normal resin coating method such as a dip method, a spray method or a brush method.

Instead of the openings 41 which are holes, the portions corresponding to the openings 41 of the film 31 can be formed by a material permeable to the pest control component.

(3) Position of the pressing tool 8 The hot vaporization medium 1 has the three openings 41 in the vaporization surface facing the area A of the pouch body 3. Furthermore, the holder 2 has the indicator 23 in the position central, plan view. Therefore in the present embodiment the two pressing arms 80 of the pressing tool 8 are arranged in positions in which the main bodies of the arm 81 do not cover the indicator 23, and in which the convex pressing portions 813 avoid the openings 41, such as can be seen in Figure 3. Furthermore, the two pressing arms 80 are arranged in a position in which the convex pressing portions 813 apply pressure to the support 2 in a balanced way.

(4) Pressure applied by the pressing tool 8

The pressing force of the pressing tool 8 is adjusted to apply a pressure of 10 to 200 g / cm <2>, preferably 20 to 150 g / cm <2>, to the support 2. It should be noted that the the value of this pressure is obtained by dividing the load applied by the pressing tool 8 by the bottom area of the support 2.

(5) Operational effects

(5-1) Main operational effects

The vaporization method of the present embodiment is performed as follows.

First of all, the hot vaporization means 1 is applied to the heating part 71 of the heating device 7 with the vaporization surface 22 facing upwards. The pressing tool 8 is then adjusted. In other words, the main arm bodies 81 are rotated to engage the front ends 812 with the engaging portions 83. Thus, the convex pressing portions 813 apply pressure from above against the hot vaporization medium 1. Consequently, the support 2 is maintained in a condition where it is pressed by the vaporization surface 22. Then, the hot vaporization medium 1 is heated from about 50 ° C to about 200 ° C. After heating the hot vaporization medium 1 from the heated surface 21 by the heating device 7, the pest control component contained in the support 2 is vaporized into the atmosphere through the three openings 41 of the pouch body 3.

In the hot vaporization medium 1 having the structure described above, the pest control component is actively vaporized from the peripheral positions of the vaporization surface 22. Hence, the pest control component is actively consumed at the peripheral positions of the vaporization surface. 22, and as a function of this consumption, the pest control component located in a central position of the vaporization surface 22 is also consumed. Thus, practically no pest control component remains in the peripheral and central positions of the vaporization surface 22. Thus, the hot vaporization medium 1 with the aforementioned structure can considerably reduce the amount of the pest control component. which remains in media 2 at the end of the period of use. Thus, the economic loss of the pest control component can be reduced. Furthermore, the pest control component of the support 2 is effectively consumed making it possible to extend the period of use.

Furthermore, as previously mentioned, the consumption of the pest control component in the central position of the vaporization surface 22 is slower than that of the pest control component at the peripheral positions, and therefore the indicator 23 indicates the dissipation of the component. pest control in the position where consumption is slowest. Therefore the indicator 23 can approximately accurately indicate the end of the period of use.

Furthermore, in the vaporization method of the present embodiment, the support 2 is maintained in a condition where it is pressed by the vaporization surface 22 during the period of use, and therefore the pest control component contained in the support 2 is easily removed. from the holder 2. Then the vaporized quantity of pest control component will not be deficient immediately after the start of use; furthermore, even in the last part of the period of use during which the quantity of the pest control component contained in the carrier 2 is reduced, the vaporized quantity of the pest control component will not decrease. Also, the vaporized amount of the pest control component per unit of time will not be uneven. Therefore, in the vaporization method of the present embodiment, the stable pest control effect can be obtained from immediately after the start of use and up to the last part of the use period.

(5-2) Other operational effects

The hot vaporization medium 1 with the structure described above can control various harmful insects and arthropods such as mites. In particular, it is possible to control, for example, the following harmful flying insects: Culex such as Culex pipiens pallens and Culex tritaeniorhynchus; Aedes such as Aedes aegypti and Aedes albopictus; Anopheles as Anopheles sinensis; Chironomids; Muscìdi such as the housefly, Muscina stabulans and Fannia canicularis; Calliforides; Sarcophagids; Drosophilids; Psychodides; Phoridia; Tabanids; Black flies; Stomoxys calcitrans; and Ceratopogonidae.

In the hot vaporization medium 1 with the aforementioned structure, the support 2 is enveloped in the pouch body 3, thus making it possible to manipulate the hot vaporization medium 1 without touching the support 2. Thus, it is possible to eliminate the risk that the pest control component comes into contact with a user's fingers.

In the hot vaporization medium 1 with the aforementioned structure, by closing the openings 41 of the pouch body 3 with a seal or the like that prevents permeation of the pest control component, the following effects can be achieved:

(a) Vaporization of the pest control component can be blocked. Therefore unnecessary vaporization of the pest control component can be prevented.

(b) It is possible to prevent the pest control component from attaching itself, through the openings 41, to a user's finger.

It should be noted that as a seal, one applied to one side with an adhesive layer, which can be easily applied and detached, is preferable. This sealing allows for repeated use.

In particular, the hot vaporization means 1 with the aforesaid structure is preferably used as follows: the openings 41 are closed by the aforementioned closure or the like before their first use, and then the closure or the like is removed at the start of use .

Other achievements

(1) The number of apertures 41 is not limited to 3 as long as it is between 3 and 10. Furthermore, the shape of each aperture 41 is not limited to the circular shape but can be square, triangular or any other shape. Furthermore, the position of the openings 41 can be unbalanced in the plan view.

(2) The pressing tool is not limited to the pressing tool 8 formed as described above as long as it can avoid the openings 41 and can press the support 2 at least at one point. For example, a pressing tool formed to be attached to part 71 from above can be used, and more specifically, a pressing arm formed by extending an arm similar to the main arm body 81 through a annular frame body.

Examples

In what follows an example of the vaporization method according to the first embodiment will be described, with reference to a comparative example. It should be noted that the present invention will not be limited to these examples.

First example

(l) Hot vaporization medium 1

A hot vaporization medium 1 used in the present example corresponds to the hot vaporization medium 1 shown in Figure 8, and has the following specific structures:

(1-1) Bag body 3

- Dimensions: length LI = 42 mm, width Wl - = 18 mm

- Diameter of each opening 41: 4 mm

- Positions of openings 41: E1 = 21 min, Ξ2 = E3 = 10 mm, E4 = E5 = 6mm

- Percentage of total opening area of all openings 41 in the area of the vaporization surface 22 of support 2 (i.e. percentage of openings): 7.7%

- Each film 31 is a polyethylene terephthalate film. It will be understood that a thin layer of polypropylene is applied to one side of the film for a heat seal.

(1-2) Support 2

- Dimensions: 14mm x 35mm x 1.6mm Constituent material: fibrous material including wood pulp and cotton linter

- Bulk density: 0.4 g / cm <3>

- Pest control component: 2,3,5,6-tetrayluoro-4-methoxymethylbenzyl-1R-trans-3- (1-propenyl (E / Z = 1/8) -2,2-di-methylcyclopropanecarboxylate

- A process which allows the support 2 to contain a pest control component was carried out as follows: an insect control component was dissolved at 8.4% by weight in 200 mg of a solution consisting of 3, 5% by weight of dibutylhydroxytoluene, 15.0% by weight of tribultylacetylcitrate and 73.1% by weight of triethylacetylcitrate, and the support 2 was impregnated with this solution.

The indicator 23 was formed by molding on the vaporization surface 22, "a layer which becomes transparent when it contains an oily liquid" described in the publication of the Japanese Unexamined Patent Application No. 2004-339209.

(2) Method of vaporization

(2-1) Position of the pressing tool 8 The position is adjusted so that the pressing of the convex portion 813 against the support 2 is centered on the points D shown in figure 8.

- Position of each point D: E6 = Ξ7 = 11 mm, E8 = E9 = 9 mm

- Diameter of each convex pressing portion 813: 1 mm

(2-2) Pressing pressure of the pressing tool 8

The pressing pressure adjusted to apply a pressure of 60 g / cm <2> to the support 2.

(2-3) Heating part 71

- Heating temperature: 120 ° C

- Dimensions of the heating plate: 40 miti x 28 min

First comparative example

(1) Medium 1 of hot vaporization

Similar to the first example.

(2) Method of vaporization

Press tool 8 is not used. Except for this, the method is similar to the first example.

Test

For the first example and the first comparative example, the following tests were performed.

(Test device)

A test device 9 illustrated in Figure 13 has been prepared. The test device 9 comprises: a first cylinder 91 having a diameter of 20 cm and a height of 80 cm; a second cylinder 92 in transparent resin with a diameter of 20 cm and a height of 30 cm; a seat 93 in metal, with a width of 7.8 cm; two transparent glass tubes 94 each having an internal diameter of 4 cm and a height of 12 cm and a heating device 7. The first cylinder 91 is mounted vertically on a plane. The base 93 is disposed diametrically on the top of the first cylinder 91.

The base 93 has two holes (not shown) each with a diameter of 4 cm. The two holes are formed at equal distances from the center of the base 93. 10 adult females of Culex pipiens pallens are introduced into the two glass tubes 94 and both ends of each of the tubes 94 are closed with a 16 mesh nylon net. The glass tubes 94 are mounted vertically in the holes of the base 93. The heating device 7 is arranged on the bottom of the first cylinder 91.

In this test device 9, after heating the hot vaporization medium 1 by means of the heating device 7, the pest control component is vaporized by the hot vaporization medium 1, moved upwards through the first cylinder 91 to flow into the glass tubes 94, moved upward through the second cylinder 92 and then discharged to the outside. Thus the mosquitoes, i.e. Culex pipiens pallens that are inside the glass tubes 94 are exposed to the pest control component, thus making it possible to evaluate the effectiveness of the pest control component.

(Test with method 1)

The hot vaporization medium 1 was attached to the heating device 7 and was then placed on the heating device 9 30 minutes after the start of heating. After 5 minutes, the number of adult females of Culex pipiens pallens that were culled was counted. In this way, the pest control effect is determined immediately after the start of use. It can be seen that the pressing tool 8 is used in the heating device 7 in the first example, but in the first comparative example the pressing tool 8 is not used in the heating device 7. Furthermore, both in the first example and in the first comparative example , during heating there is no vacuum between the heated surface 21 of the hot vaporization medium 1 and the film 31, and between the film 31 and the heater plate of the heating device 7, but they have been brought into intimate contact with each other.

(Test method 2)

Before placing the hot vaporization medium 1 in the test device 9, the hot vaporization medium 1 was attached to the heating device 7 and heated by repeating the on and off cycle six times every 12 hours. The heating temperature was 120 ° C. Then, after a time of 5 hours from the beginning of the seventh heating, the hot vaporization medium 1 was placed in correspondence with the test device 9 remaining attached to the heating device 7 so as to be heated to about 120 ° C and, after 5 minutes, the number of adult females of Culex pipiens pallens culled was counted. Thus, the pest control effect in the latter part of the use period was determined. It can be seen that the pressing tool 8 is used in the heating device 7 in the first example, but the pressing device 8 in the heating device 7 of the first comparative example is not used. Furthermore, in both the first example and the first comparative example, during heating there is no gap between the heated surface 21 of the hot vaporization medium 1 and the film 31, and between the film 31 and the heating plate of the heating device 7 , but these have been brought into intimate contact with each other.

The results of Test Methods 1 and 2 are shown together in Table 1.

Table 1

(Results)

In the first example it was possible to obtain a stable pest control effect from immediately after the start of use up to the last part of the use period. In contrast, in the first comparative example, the pest control effect was insufficient immediately after the start of use.

Industrial applicability

The vaporization method of the present invention can stabilize the vaporized amount of the pest control component over the entire period of use of the hot vaporization medium, and therefore has high industrial applicability.

Claims (12)

CLAIMS 1. Method of vaporization by heating a means for the control of pests by hot vaporization, comprising a plate support and a bag body that wraps the support, on one side of the support, thereby vaporizing by hot vaporization a pest control component contained in the support on the other side of the support itself, through an opening formed in the bag body, the vaporization method characterized by maintaining the support in a condition in which the support is pressed on the other side during heating. 2. Vaporization method according to claim 1, in which the pressing force is adjusted in such a way as to apply a pressure of 10 to 200 g / cm <2> to the support. Vaporization method according to claim 1, in which the pressing force is adjusted in such a way as to apply a pressure of 20 to 150 g / cm <2> to the support. 4. Vaporization method according to claim 1, in which the support is pressed by means of a pressing tool which avoids openings and compresses the support at least in one point. 5. Vaporization method according to claim 1, where the thickness of the support is from 0.2 to 5.0 mm. 6. Vaporization method according to claim 1, in which the support is made of fibrous material, and has an apparent density from 0.2 to 0.7 g / cm <3>. 7. Vaporization method according to claim 1, wherein the pest control component by hot vaporization is a compound represented by the following formula (1): (where R <1> and R <2> each represent a hydrogen atom, a methyl group or a chlorine atom, and R <3> represents a hydrogen atom, a fluorine atom, a methyl group, a methoxyl or a methoxymethyl group). 8. Vaporization method according to claim 7, in which the compound is: 2.3.5.6-tetrafluoro-4-methoxy methylbenzyl-3- (1-propenyl) -2, 2-dimethylcyclopropanecarboxylate; 2.3.5.6-tetrafluoro-4-methylbenzyl-3- (1-propenyl) -2,2-dimethylcyclopropanecarboxylate; 2.3.5.6-tetrafluorobenzyl-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate; 2.3.5.6-tetrafluoro-4-methoxymethylbenzyl-3 - (2-methyl-1-propenyl) -2,2-dimethylcyclopropanecarboxylate; or 2.3.4 .5.6-pentafluorobenzyl-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate. 9. Vaporization method according to claim 1, wherein the pest control component by hot vaporization is used to impregnate the support in the form of a solution in an ester based solvent having a boiling point of 200 ° C or more. 10. Vaporization method according to claim 9, wherein the ester-based solvent is acetyl citrate. 11. Vaporization method according to claim 10, wherein the acetyl citrate is triethyl acetyl citrate and / or tributyl acetyl nitrate. Pest control method characterized by performing pest control using the vaporization method according to any one of claims 1 to 11.