Aerosol nozzle and aerosol product

Abstract

To make jetting characteristics even and suppress scattering and falling of particulates when a plurality of jetting holes is provided.SOLUTION: An aerosol nozzle 23 has a flow channel 230 that extends upward while being communicated to an upper part of a stem 32 provided in an aerosol container 3. A plurality of jetting holes 231, 232, 233, 234 is disposed upward from the stem 32 while being spaced apart from one another in a direction in which the flow channel 230 extends. Bore diameters of the jetting holes 231, 232, 233, 234 are set to a range between 0.40 mm and 0.80 mm.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an aerosol nozzle and an aerosol product having an aerosol nozzle. [Background technology]

[0002] Aerosol products are designed to obtain the efficacy of a drug by spraying the drug contained in the aerosol container into the air using a propellant. In order to spray the drug over a wide area, a nozzle with multiple spray holes is sometimes provided on the aerosol container of such aerosol products (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-91577 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the multiple injection holes are spaced apart in the flow direction of the drug and propellant flow paths, the injection properties of the injection hole located most upstream differ from those of the injection hole located most downstream, which can result in non-uniform injection properties.

[0005] On the other hand, if the nozzle is designed to reduce the particle diameter sprayed from the nozzle, the non-uniformity of the spray characteristics can be improved, but when trying to apply the chemical solution to a screen door or window glass, the particles tend to scatter, which can reduce the rate of adhesion to the screen door or window glass.It is also thought that the scattering of particles can make users more susceptible to irritation.

[0006] The present disclosure has been made in consideration of the above points, and an object thereof is to make the injection properties uniform and to suppress scattering of particles when a plurality of injection holes are provided. [Means for solving the problem]

[0007] To achieve the above object, one aspect of the present disclosure can be based on an aerosol nozzle having a plurality of injection holes and a flow path communicating with the plurality of injection holes. The flow path extends upward and communicates with an upper portion of a stem provided in an aerosol container. The injection holes are arranged above the stem at intervals in the direction of extension of the flow path, and the diameters of the injection holes are set in the range of 0.40 mm to 0.80 mm.

[0008] According to this configuration, by forming multiple injection holes, the medicine contained in the aerosol container can be injected over a wide area using the propellant. Furthermore, by forming the multiple injection holes at intervals in the vertical direction above the stem and setting the diameter of each injection hole to 0.40 mm or more and 0.80 mm or less, the injection characteristics of the multiple injection holes are made uniform and scattering of particles injected from each injection hole is suppressed.

[0009] The aerosol nozzle may be configured so that the average particle diameter (D50) at a distance of 30 cm from the nozzle in the spray direction is 30 μm or more, which makes the spray characteristics more uniform and prevents particles from scattering, thereby increasing the rate of adhesion to, for example, screen doors and window panes.

[0010] Three or more injection holes may be formed. In this case, the diameter of the lowest injection hole may be set larger than the diameter of the highest injection hole. The diameter of the lowest injection hole may also be set to 110% or more of the diameter of the highest injection hole.

[0011] The injection holes may include a first injection hole, a second injection hole located below the first injection hole, a third injection hole located below the second injection hole, and a fourth injection hole located below the third injection hole. When the first injection hole is the uppermost injection hole and the fourth injection hole is the lowermost injection hole, the hole diameters of the third injection hole and the fourth injection hole may be set larger than the hole diameter of the first injection hole.

[0012] A communication passage may be formed between the flow path and the injection hole, extending in a direction intersecting the flow path and connecting the flow path to the injection hole. This allows the chemical solution that has flowed through the flow path to flow into the communication passage, and after flowing through the communication passage, is injected from the injection hole. The inner diameter of the communication passage may be set to be larger than the diameter of the injection hole. A throttle portion having a diameter smaller than the inner diameter of the communication passage may be provided between the flow path and the communication passage.

[0013] The cross-sectional area of ​​the portion of the flow path through which the uppermost injection hole communicates may be set smaller than the cross-sectional area of ​​the portion of the flow path through which the lowermost injection hole communicates.

[0014] Another aspect of the present disclosure may be an aerosol cap equipped with the aerosol nozzle, or an aerosol product equipped with the aerosol nozzle. [Effects of the Invention]

[0015] As described above, according to the present disclosure, when multiple injection holes are provided, the injection properties can be made uniform, and the scattering of particles can be suppressed, thereby improving the adhesion rate to, for example, screen doors or window glass, and making it less likely that the user will feel irritation. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing the upper portion of an aerosol product according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the upper portion of the aerosol product. [Figure 3] FIG. 3 is a front view showing the positional relationship of the injection holes. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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.

[0018] Fig. 1 is a perspective view showing the upper portion of an aerosol product 1 according to an embodiment of the present invention. Fig. 2 is a vertical cross-sectional view of the upper portion of the aerosol product 1. The aerosol product 1 includes an aerosol container cap 2 and an aerosol container 3. In this embodiment, the aerosol product 1 is made up of the aerosol container cap 2 and the aerosol container 3, but the aerosol product 1 may also include components other than the aerosol container cap 2 and the aerosol container 3.

[0019] In the description of this embodiment, the "front side" refers to the direction in which the contents of the aerosol container 3 are sprayed when the user holds the aerosol product 1 in a state in which it is to be used, the "rear side" refers to the side opposite the direction in which the contents are sprayed when the user holds the aerosol product 1 in that state, the "right side" refers to the side that is to the right as seen from the user when the user holds the aerosol product 1 in that state, and the "left side" refers to the side that is to the left as seen from the user when the user holds the aerosol product 1 in that state. The front side and the rear side can also be referred to as the front side and the rear side, respectively. These definitions are provided merely for the sake of convenience, and any direction may be the front or the rear.

[0020] (Configuration of aerosol container 3) Before describing the aerosol container cap 2, the aerosol container 3 will be described. As shown in FIG. 2, the aerosol container 3 comprises a vertically elongated container body 30 containing the contents, i.e., a medicament and a propellant, and a valve mechanism 31 and a stem (ejection pipe) 32 provided at the top of the container body 30. The container body 30 is a cylindrical pressure-resistant container. The stem 32 is provided at approximately the center of the upper wall of the container body 30. The lower end of the stem 32 is capable of communicating with the interior of the container body 30 via the valve mechanism 31. The stem 32 is biased upward by the valve mechanism 31 so as to protrude upward from the upper wall of the container body 30, and is also capable of being pushed downward (into the interior of the container body 30).

[0021] When the stem 32 is pressed downward, the valve mechanism 31 opens, connecting the stem 32 to the interior of the container body 30, and the propellant pressure causes the chemical to be sprayed to the outside. When the downward external force on the stem 32 is removed, the stem 32 returns to its original position due to the biasing force of the valve mechanism 31, and the valve mechanism 31 closes. The chemical stored in the container body 30 is not limited to insecticide. Usable propellants include, for example, liquefied petroleum gas (LPG), dimethyl ether (DME), and compressed gases (carbon dioxide, nitrogen, nitrous oxide). The propellant may contain only one arbitrarily selected type of these, or a mixture of two or more arbitrarily selected types.

[0022] Examples of insecticides contained in the contents include pyrethroid, organophosphate, carbamate, neonicotinoid, etc. The contents may contain any one of the pyrethroid, organophosphate, carbamate, and neonicotinoid insecticides, or any two or more of them.

[0023] Examples of pyrethroid insecticides include etofenprox, cyfluthrin, phthalthrin, fenpropathrin, permethrin, bifenthrin, fenothrin, cyphenothrin, cypermethrin, tralomethrin, pyrethrins, allethrin, resmethrin, furamethrin, empenthrin, prallethrin, imiprothrin, momfluorothrin, transfluthrin, metofluthrin, profluthrin, dimefluthrin, mepafluthrin, etc. Any one of these may be contained in the contents, or any two or more of them may be contained in the contents.

[0024] Examples of organophosphate insecticides include acephate, fenitrothion, dichlorvos, chlorpyrifos-methyl, diazinon, fenthion, etc. Any one of these may be contained in the contents, or any two or more of them may be contained in the contents.

[0025] Examples of carbamate insecticides include carbaryl, propoxur, etc. Any one of these may be contained in the contents, or any two or more of them may be contained in the contents.

[0026] Examples of neonicotinoid insecticides include acetamiprid, thiamethoxam, imidacloprid, dinotefuran, etc. Any one of these may be contained in the contents, or any two or more of them may be contained in the contents.

[0027] The insecticide is not limited to those mentioned above, and for example, metoxadiazone, fipronil, amidoflumet, broflanilide, etc. may be contained in the contents.

[0028] The insecticide may contain, for example, essential oils. Examples of usable essential oils include peppermint oil, peppermint oil, rosemary oil, orange oil, fennel oil, cinnamon oil, clove oil, turpentine oil, eucalyptus oil, cypress oil, Japanese cypress oil, patchouli oil, sandalwood oil, camphor oil, jasmine oil, neroli oil, bergamot oil, butiglen oil, lemon oil, lemongrass oil, cinnamon oil, citronella oil, geranium oil, copaiba oil, ginger oil, citral, L-menthol, citronellyl acetate, cinnamic aldehyde, terpineol, nonyl alcohol, cis-jasmone, limonene, linalool, 1,8-cineole, geraniol, α-pinene, p-menthane-3,8-diol, eugenol, menthyl acetate, thymol, benzyl benzoate, and benzyl salicylate. Any one of these may be contained in the contents, or any two or more of these may be contained in the contents.

[0029] The contents may contain a solvent. Examples of solvents contained in the contents include ether-based, hydrocarbon-based, ester-based, alcohol-based, fluorine-based, and water. Any one of these may be contained in the contents, or any two or more of these may be contained in the contents.

[0030] Examples of ether-based solvents include diethyl ether, ethylene glycol dimethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, tetrahydrofuran, dioxane, etc. Any one of these may be contained in the contents, or any two or more of these may be contained in the contents.

[0031] Examples of hydrocarbon solvents include xylene, toluene, alkylnaphthalene, phenylxylylethane, kerosene, light oil, hexane, cyclohexane, etc. Any one of these may be contained in the contents, or any two or more of these may be contained in the contents.

[0032] An example of the ester solvent is isopropyl myristate.

[0033] Examples of alcohol-based solvents include ethanol, isopropanol, benzyl alcohol, ethylene glycol, etc. Any one of these may be contained in the contents, or any two or more of these may be contained in the contents.

[0034] Examples of fluorine-based solvents include hydrofluoroolefins (HFOs).

[0035] Examples of water that can be used as a solvent include tap water, ion-exchanged water, distilled water, filtered water, sterilized water, and groundwater.

[0036] The contents may contain, for example, pest repellent ingredients, film-forming agents, water-repellent ingredients (such as silicone), powders, fragrances, deodorizing ingredients, surfactants, synergists, disinfecting ingredients, antibacterial ingredients, antifungal ingredients, detergents, antioxidants, ultraviolet absorbers, etc.

[0037] The target pests of the above-mentioned insecticides and pest repellent components may be creeping pests or flying pests, and specific examples include mosquitoes, midges, flies, stable flies, cockroaches, bedbugs, stink bugs, moths, winged ants, ants, fire ants, Argentine ants, centipedes, millipedes, house centipedes, pill bugs, caterpillars, midges, spiders, planthoppers, leafhoppers, moth flies, black flies, horseflies, bees, fungus gnats, booklice, crane flies, and thrips.

[0038] When the volume ratio of the concentrate (components other than the propellant) to the propellant (gas) contained in the aerosol container 3 is defined as the liquid-to-gas ratio (liquid / gas), the range of the liquid-to-gas ratio is 5 / 95 to 33 / 67. If the liquid-to-gas ratio is within this range, the spray properties are excellent and the particle diameter becomes the desired size.

[0039] When spraying the chemical agent from the aerosol container 3, it may be sprayed, for example, into space, or onto the floor or a gap. The spray direction of the chemical agent may be upward, downward, or horizontal. Furthermore, the aerosol product 1 may be an aerosol product for screen doors, sprayed onto a screen door from a distance of 30 cm to 50 cm. By spraying onto a screen door from a distance of 30 cm to 50 cm, the particles are prevented from scattering while allowing them to adhere to the screen door, thereby efficiently achieving the effects of, for example, an insecticide or pest repellent. In addition to screen doors, the chemical agent may also be sprayed onto window glass, entrance lights, entrance doors, outdoor lights, building exterior walls, fences, bamboo blinds, reed blinds, outdoor trash cans, trash dumps, entrance areas, gardens, verandas, etc.

[0040] The average particle diameter (D50) of the spray particles sprayed from the aerosol nozzle 23 is set to be 30 μm or more at a point 30 cm away from the nozzle in the spray direction, as described below. The average particle diameter (D50) of the particles sprayed from the aerosol nozzle 23 is set to be 150 μm or less at a point 30 cm away from the nozzle in the spray direction. The average particle diameter can be set within the above range by the hole diameter of the nozzle and the inner diameter of the flow path, as described below.

[0041] Here, we will explain the method for measuring the average particle size of particles sprayed from the aerosol nozzle 23. Although not shown, the drug is sprayed from a position where the distance between the laser beam irradiated onto the light receiving part from the laser light irradiating part of the particle size measuring device and the spray nozzle is 30 cm, so that the particles pass through the laser beam in a direction perpendicular to the irradiation direction. Measurements are taken while the drug is being sprayed, and the particle size distribution of the drug is analyzed by an automatic processing device to determine the average particle size (D50). This method is well known. The measuring device used is an LDSA-SPR-1500A manufactured by Microtrac-Bell Corporation.

[0042] (Overall configuration of aerosol container cap 2) As shown in Fig. 1, the aerosol container cap 2 is a member attached to the top of the aerosol container 3, and is made of, for example, a resin material. As shown in Fig. 2, the aerosol container cap 2 includes a cap body 20 fixed to the aerosol container 3, a stem fitting portion 21 that fits into the stem 32, an operation button 22 for operating the stem fitting portion 21 in the pushing direction of the stem 32, and an aerosol nozzle 23.

[0043] The lower part of the cap body 20 is formed in a cylindrical shape, and this cylindrically formed part is adapted to fit into the upper part of the container body 30. A left protruding part 24 and a right protruding part 25 (shown in FIG. 1) that protrude upward are formed on both the left and right sides of the cap body 20. The stem fitting part 21, the operation button 22, and the aerosol nozzle 23 are arranged between the left protruding part 24 and the right protruding part 25.

[0044] The stem fitting portion 21 has a cylindrical shape extending in the vertical direction and is integrally molded with the lower portion of the aerosol nozzle 23. A connecting plate portion 26 that is connected to the lower portion of the cap body 20 is provided at the lower portion of the aerosol nozzle 23. This connecting plate portion 26 is elastic, and connects the aerosol nozzle 23 to the lower portion of the cap body 20 so that the aerosol nozzle 23 can swing up and down. The elasticity of the resin allows the connecting plate portion 26 to elastically deform. The operation button 22 is integrally molded with the rear side of the aerosol nozzle 23. Pressing the operation button 22 downward moves the stem 32 downward, opening the valve mechanism 31. The cap body 20, stem fitting portion 21, operation button 22, and aerosol nozzle 23 are integrated into a single component.

[0045] A flow path 230 extending in the vertical direction is formed in the aerosol nozzle 23. The lower end of the flow path 230 is the upstream end, and is connected to the upper part of the stem 32 of the aerosol container 3 via the stem fitting part 21. Therefore, the flow path 230 communicates with the upper part of the stem 32 and extends upward.

[0046] The flow path 230 is located directly above the stem 32, between the operation button 22 and the connecting plate portion 26. In a plan view, the flow path 230 and the opening of the stem 32 are positioned so as to overlap each other. The upper end of the flow path 230 is the downstream end, and is located lower than the upper ends of the left protrusion 24 and the right protrusion 25.

[0047] The front portion of the aerosol nozzle 23 is formed with a first injection hole 231, a second injection hole 232 located below the first injection hole 231, a third injection hole 233 located below the second injection hole 232, and a fourth injection hole 234 located below the third injection hole 233. The first injection hole 231, the second injection hole 232, the third injection hole 233, and the fourth injection hole 234 correspond to the multiple injection holes of the present invention, and in this embodiment, the multiple injection holes include the first injection hole 231, the second injection hole 232, the third injection hole 233, and the fourth injection hole 234. The first injection hole 231 is located at the top, and the fourth injection hole 234 is located at the bottom. The number of injection holes is not limited to four, and may be two, three, five or more.

[0048] The fourth injection hole 234, which is located at the bottom, is located above the stem 32. Therefore, the first injection hole 231, the second injection hole 232, the third injection hole 233 and the fourth injection hole 234 are arranged above the stem 32 at intervals from one another in the direction in which the flow path 230 extends (the up-down direction). The fourth injection hole 234, which is located at the bottom, is closest to the stem 32, while the first injection hole 231, which is located at the top, is farthest from the stem 32.

[0049] The first to fourth injection holes 231 to 234 are circular. As shown in FIG. 3 , when a horizontal line A passes through the center of the first injection hole 231, a horizontal line B passes through the center of the second injection hole 232, a horizontal line C passes through the center of the third injection hole 233, and a horizontal line D passes through the center of the fourth injection hole 234 in a front view, the distance L1 between the horizontal line A and the horizontal line B, the distance L2 between the horizontal line B and the horizontal line C, and the distance L3 between the horizontal line C and the horizontal line D are all set equal. In other words, the distance between the first injection hole 231 and the second injection hole 232, the distance between the second injection hole 232 and the third injection hole 233, and the distance between the third injection hole 233 and the fourth injection hole 234 are all the same. Note that the distances L1, L2, and L3 may be different from one another. The first to fourth injection holes 231 to 234 may be arranged in a vertical direction or diagonally. The distances L1, L2, and L3 are set in the range of 2 mm to 20 mm.

[0050] The hole diameter D1 of the first injection hole 231, the hole diameter D2 of the second injection hole 232, the hole diameter D3 of the third injection hole 233, and the hole diameter D4 of the fourth injection hole 234 are set in the range of 0.40 mm to 0.80 mm. The upper limit of the hole diameters D1, D2, D3, and D4 is more preferably 0.60 mm or less. The hole diameters D1, D2, D3, and D4 may all be the same diameter, or some of the hole diameters may be larger than the other hole diameters. For example, the hole diameter D4 of the fourth injection hole 234, which is located at the bottom, may be set larger than the hole diameter D1 of the first injection hole 231, which is located at the top. In this case, the hole diameter D4 of the fourth injection hole 234 can be set to 110% or more of the hole diameter D1 of the first injection hole 231. The hole diameter D4 of the fourth injection hole 234 is preferably set to 150% or less of the hole diameter D1 of the first injection hole 231.

[0051] The hole diameter D3 of the third injection hole 233 and the hole diameter D4 of the fourth injection hole 234 can also be made the same. In this case, the hole diameter D3 of the third injection hole 233 and the hole diameter D4 of the fourth injection hole 234 are larger than the hole diameter D1 of the first injection hole 231. The hole diameter D1 of the first injection hole 231 and the hole diameter D2 of the second injection hole 232 can also be made the same. The hole diameter D1 of the first injection hole 231, the hole diameter D2 of the second injection hole 232, and the hole diameter D3 of the third injection hole 233 can also be made the same.

[0052] Between the flow path 230 and the first injection hole 231, a first communication passage 241 is formed, which extends in a direction intersecting the flow path 230 and connects the flow path 230 to the first injection hole 231. Between the flow path 230 and the second injection hole 232, a second communication passage 242 is formed, which extends in a direction intersecting the flow path 230 and connects the flow path 230 to the second injection hole 232. Between the flow path 230 and the third injection hole 233, a third communication passage 243 is formed, which extends in a direction intersecting the flow path 230 and connects the flow path 230 to the third injection hole 233. Between the flow path 230 and the fourth injection hole 234, a fourth communication passage 244 is formed, which extends in a direction intersecting the flow path 230 and connects the flow path 230 to the fourth injection hole 234.

[0053] The first communication passage 241, the second communication passage 242, the third communication passage 243, and the fourth communication passage 244 are arranged at intervals in the up-down direction, similar to the first to fourth injection holes 231-234. The first communication passage 241, the second communication passage 242, the third communication passage 243, and the fourth communication passage 244 are substantially perpendicular to the flow path 230 and extend forward. Therefore, when the chemical liquid (including the propellant) flowing upward through the flow path 230 flows into the first communication passage 241, the second communication passage 242, the third communication passage 243, and the fourth communication passage 244, the chemical liquid flows forward and the flow direction is changed. In this way, the aerosol nozzle 23 is provided with a flow direction changer that changes the flow of the chemical liquid.

[0054] The inner diameters of the first communication passage 241, the second communication passage 242, the third communication passage 243, and the fourth communication passage 244 are set larger than the hole diameters D1 to D4 of the first injection hole 231, the second injection hole 232, the third injection hole 233, and the fourth injection hole 234, respectively. A first throttle section 251 having a diameter smaller than the inner diameter of the first communication passage 241 is provided between the flow path 230 and the first communication passage 241. The downstream side of the flow path 230 communicates with the first communication passage 241 via the first throttle section 251. The inner diameter of the first throttle section 251 is set larger than the hole diameter D1 of the first injection hole 231.

[0055] A second throttle section 252 having a diameter smaller than the inner diameter of the second communication passage 242 is provided between the flow passage 230 and the second communication passage 242. An intermediate section of the flow passage 230 in the flow direction communicates with the second communication passage 242 via the second throttle section 252. The inner diameter of the second throttle section 252 is set larger than the hole diameter D2 of the second injection hole 232.

[0056] A third throttle section 253 having a diameter smaller than the inner diameter of the third communication passage 243 is provided between the flow passage 230 and the third communication passage 243. An intermediate section of the flow passage 230 in the flow direction communicates with the third communication passage 243 via the third throttle section 253. The inner diameter of the third throttle section 253 is set larger than the hole diameter D3 of the third injection hole 233.

[0057] A fourth throttle section 254 having a smaller diameter than the inner diameter of the fourth communication passage 244 is provided between the flow passage 230 and the fourth communication passage 244. The upstream side of the flow passage 230 communicates with the fourth communication passage 244 via the fourth throttle section 254. The inner diameter of the fourth throttle section 254 is set to be larger than the hole diameter D4 of the fourth injection hole 234. The inner diameters of the first to fourth throttle sections 251 to 254 are all the same.

[0058] The cross-sectional area of ​​the flow path 230 varies depending on the location. Specifically, the cross-sectional area of ​​the flow path 230 decreases toward the upper side (downstream side) of the flow path 230. The cross-sectional area of ​​the portion of the flow path 230 with which the uppermost first injection hole 231 communicates is set smaller than the cross-sectional area of ​​the portion of the flow path 230 with which the lowermost fourth injection hole 234 communicates. The cross-sectional area of ​​the flow path 230 may be constant from the upstream end to the downstream end. [Example]

[0059] EXAMPLES The present invention will be explained in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0060] (Test 1) The test agent in Test 1 had a pyrethroid compound as the active ingredient, and the solvent was either isoparaffin alone or a mixture of isopropyl myristate, propylene glycol monomethyl ether, and isoparaffin, which was used as the concentrate, and the propellant was LPG 2.8, with a liquid-to-gas ratio of 33 / 67.

[0061] The test materials used in Test 1 were an aerosol container cap equipped with an aerosol nozzle and an aerosol container with a valve mechanism. As shown in Figure 2, the aerosol nozzle has a first injection hole 231, a second injection hole 232, a third injection hole 233, and a fourth injection hole 234. For convenience, in the tables below, the first injection hole 231 is referred to as "injection hole 1," the second injection hole 232 as "injection hole 2," the third injection hole 233 as "injection hole 3," and the fourth injection hole 234 as "injection hole 4." The test material was sprayed for several seconds, and the spray properties were confirmed visually.

[0062] (Evaluation criteria) 〇: Normal injection △: Linear spray from some holes ×: Linear spray from all holes Examples 1 to 5 in Table 1 are samples with good spray properties. Only for samples with good spray properties, the average particle diameter (D50) was measured at a spray distance of 30 cm using a particle diameter measuring instrument. Measurements were taken at three locations: the top, center, and bottom. The top location was 30 cm horizontally away from spray hole 1, the center location was 30 cm horizontally away from the midpoint between spray holes 2 and 3, and the bottom location was 30 cm horizontally away from spray hole 4. Setting the measurement locations in this way makes it possible to measure the average particle diameter of particles sprayed from spray holes 1 to 4.

[0063] [Table 1]

[0064] When the hole diameters of all injection holes 1 to 4 were 0.40 mm or more and 0.50 mm or less, the spray quality was good for all injection holes 1 to 4, and the average particle diameter (D50) at the top, center, and bottom was also large. Furthermore, when the hole diameters of all injection holes 1 to 4 were 0.40 mm or more and 0.50 mm or less, the variation in the average particle diameter (D50) at the top, center, and bottom was small. Furthermore, when the hole diameters of the lower injection holes 3 and 4 were 10% larger than those of the upper injection holes 1 and 2, the spray quality was good and the average particle diameter (D50) was even larger. The larger average particle diameter (D50) suppresses particle scattering, improving the rate of adhesion to screen doors and window glass, and reducing irritation to the user. When the hole diameters of injection holes 1 to 4 exceeded 0.80 mm and reached 1.00 mm, as in Comparative Example 1, the spray was linear, making it difficult for particles to form, and the spray quality deteriorated.

[0065] (Test 2) The test material for Test 2 consisted of only normal paraffin as the solvent, with LPG 2.8 or 4.0 as the propellant and a liquid-to-gas ratio of 5 / 95 to 30 / 70. The test materials used for Test 2 were the same as those used in Test 1. The test material was sprayed for several seconds, and the spray properties were confirmed visually. The evaluation criteria were the same as those for Test 1.

[0066] Furthermore, Examples 6 to 15 in Tables 2 and 3 are samples with good jetting properties. Only for samples with good jetting properties, the average particle diameter (D50) was measured at the center from a distance of 30 cm using a particle diameter measuring device.

[0067] [Table 2]

[0068] [Table 3]

[0069] By adjusting the liquid-to-gas ratio and type of propellant, the spray quality was good and the average particle size (D50) was large, even when the diameters of all injection holes 1 to 4 were 0.80 mm. When the diameters of injection holes 1 to 4 exceeded 0.80 mm and reached 1.00 mm, the spray was linear, making it difficult to form particles, and the spray quality deteriorated, even when the liquid-to-gas ratio and type of propellant were adjusted.

[0070] (Test 3) The test material for Test 3 was made from isoparaffin alone as the solvent, with LPG 2.8 or 4.0 as the propellant and a liquid-to-gas ratio of 5 / 95 to 30 / 70. The test material for Test 3 was the same as that used in Test 1. The test material was sprayed for several seconds and the spray properties were confirmed visually. The evaluation criteria were the same as those for Test 1.

[0071] Furthermore, Examples 16 to 25 in Tables 4 and 5 are samples with good jetting properties. Only for samples with good jetting properties, the average particle diameter (D50) was measured at the center from a distance of 30 cm using a particle diameter measuring device.

[0072] [Table 4]

[0073] [Table 5]

[0074] By adjusting the liquid-gas ratio and type of propellant, the spray properties were good even when the diameters of all the spray holes 1 to 4 were 0.80 mm, and the average particle diameter (D50) was also large.

[0075] (Test 4) Test 4 is an adhesion rate test. The test agent for Test 4 was an aerosol concentrate containing bifenthrin as the active ingredient and isoparaffin as the solvent, with a mixture of these used as the aerosol concentrate, LPG 2.8 as the propellant, and a liquid-to-gas ratio of 33 / 67. The test materials used for Test 4 were the same as those used in Test 1. For the comparative example, an aerosol nozzle with a nozzle diameter of 0.36 mm for all nozzle holes 1 to 4 was used (Comparative Example 14). In addition, a sample of a screen door piece (polypropylene, 18 mesh) and a vinyl chloride plate were prepared.

[0076] A 90cm x 90cm screen sample was attached to an aluminum frame and placed in front of a vinyl chloride plate simulating a glass window, and the test agent was sprayed on it from a distance of 30cm for 4 seconds. The adhesion rate was calculated from the difference in weight (amount of adhesion) of the screen sample before and after treatment and the amount of undiluted solution sprayed.

[0077] Adhesion rate (%) = Adhesion amount (g) / Amount of sprayed concentrate (g) x 100 The adhesion rate of the screen door piece sample in Comparative Example 14 was set at 100, and the adhesion rates of the Examples were calculated as relative values.

[0078] In addition, only test agents with good spray properties were measured for average particle size (D50) from a distance of 30 cm using a particle size measuring device.

[0079] [Table 6]

[0080] In all of Examples 1 to 3, the amount of screen door pieces adhering to the samples increased compared to the Comparative Example. The increase in the amount of screen door pieces adhering to the samples means that scattering of particles is suppressed.

[0081] (Test 5) Test 5 is an irritation test. The test material for Test 5 was bifenthrin as the active ingredient, isoparaffin as the solvent, and the mixture was used as the aerosol concentrate, with LPG 2.8 as the propellant and a liquid-to-gas ratio of 33 / 67. The test material for Test 5 was the same as that for Test 1.

[0082] Five subjects entered an 8-tatami room and sprayed the test agent for six seconds under unventilated conditions. The five subjects were then asked to wait in the room for five minutes. Afterwards, the five subjects were asked to complete a questionnaire regarding irritation to the nose, throat, skin, etc., using the following evaluation criteria, and the average score was calculated.

[0083] (Evaluation criteria) 1: Same as before use 2: Slight discomfort 3: It feels a little strange 4: It feels strange 5: I feel a strong sense of discomfort

[0084] [Table 7]

[0085] In Comparative Example 1, in which the diameters of all of the injection holes 1 to 4 were 0.36 mm, the average irritation score was 4.6, which was at a level where there was discomfort or a strong discomfort, whereas in Example 3, in which the diameters of the injection holes 1 and 2 were 0.50 mm and the diameters of the injection holes 3 and 4 were 0.55 mm, the average irritation score was 2.8, which was at a level where there was slight discomfort or a little discomfort. In this way, in the Examples, scattering of particles is suppressed, making it less likely that the user will feel irritation.

[0086] The above-described embodiments are merely illustrative 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. For example, even when two, three, or five or more spray holes are provided, the spray characteristics can be made uniform as described above, particle scattering can be suppressed, improving the rate of adhesion to, for example, screen doors or window glass, and reducing the irritation felt by the user. Furthermore, even when, for example, a different solvent or type of insecticide is used, the spray characteristics can be made uniform as described above, particle scattering can be suppressed, improving the rate of adhesion to, for example, screen doors or window glass, and reducing the irritation felt by the user. [Industrial Applicability]

[0087] As described above, the present disclosure can be used when spraying insecticides, pest repellents, etc. over a wide area, for example. [Explanation of symbols]

[0088] 1. Aerosol products 23 Aerosol nozzle 230 Channel 231 1st injection hole 232 2nd injection hole 233 3rd injection hole 234 4th injection hole 241 1st communication passage 251 First throttle section

Claims

1. An aerosol nozzle having a plurality of injection holes and a flow path communicating with the plurality of injection holes, the flow path extends upward and communicates with an upper portion of a stem provided on the aerosol container; The plurality of injection holes are arranged above the stem at intervals in the direction in which the flow path extends, The aerosol nozzle, wherein the diameter of the injection hole is set in the range of 0.40 mm or more and 0.80 mm or less.

2. The aerosol nozzle according to claim 1, The aerosol nozzle is configured so that the average particle diameter (D50) at a distance of 30 cm from the injection hole in the injection direction is 30 μm or more.

3. The aerosol nozzle according to claim 1, Three or more injection holes are formed, An aerosol nozzle, wherein the hole diameter of the lowest-positioned injection hole is set larger than the hole diameter of the highest-positioned injection hole.

4. The aerosol nozzle according to claim 3, An aerosol nozzle, wherein the hole diameter of the lowest-positioned injection hole is set to 110% or more of the hole diameter of the highest-positioned injection hole.

5. The aerosol nozzle according to claim 3, the injection holes include a first injection hole, a second injection hole located below the first injection hole, a third injection hole located below the second injection hole, and a fourth injection hole located below the third injection hole, the first injection hole is located at the top and the fourth injection hole is located at the bottom, The aerosol nozzle, wherein the hole diameters of the third injection hole and the fourth injection hole are set larger than the hole diameter of the first injection hole.

6. The aerosol nozzle according to claim 1, The aerosol nozzle has a communication passage formed between the flow path and the injection hole, the communication passage extending in a direction intersecting the flow path and connecting the flow path to the injection hole.

7. The aerosol nozzle according to claim 6, The inner diameter of the communication passage is set to be larger than the hole diameter of the injection hole, The aerosol nozzle further comprises a throttle portion between the flow path and the communication passage, the throttle portion having a diameter smaller than an inner diameter of the communication passage.

8. The aerosol nozzle according to claim 1, An aerosol nozzle, wherein the cross-sectional area of ​​the portion of the flow path where the uppermost injection hole communicates is set smaller than the cross-sectional area of ​​the portion of the flow path where the lowermost injection hole communicates.

9. An aerosol product comprising the aerosol nozzle according to any one of claims 1 to 8.

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