incense sticks

Abstract

To provide an incense stick that suppresses the occurrence of smoke and pungent odor (smoke odor) when the incense stick is burnt, and suppresses the rising and scattering of ash, and allows a volatile compound to be volatilized in a short time in high concentrations.SOLUTION: A tabular incense stick has a burning substrate, inorganic substance and a volatile compound, with the content of the inorganic substance being 30-70 mass%, the content of the burning substrate being 25-60 mass%, and the thickness of the incense stick being 2 mm or more and less than 5 mm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sheet-shaped incense stick. [Background technology]

[0002] Traditionally, incense sticks have been produced by using plant powder as a combustion base material, to which active ingredients such as pest control ingredients and volatile compounds such as fragrances are added, along with binders, combustion improvers, colorants, preservatives, etc., and then adding water and kneading the mixture, followed by molding and drying. However, plant powders cause smoke and a pungent odor (smoky smell) when burned, and the ash produced after combustion is blown around by wind from fans, etc., causing contamination of the incense stick holder and the room.

[0003] Therefore, in order to reduce the smoke and irritating odor generated during combustion, inorganic substances have been incorporated into incense. For example, Patent Document 1 discloses a mosquito coil in which the amount of plant powder is reduced and 10% or more of fine mineral powder such as talc or clay is mixed in. Furthermore, Patent Document 2 discloses a mosquito coil containing 3 to 50% by weight of calcium carbonate, Patent Document 3 discloses an incense containing rattan powder and mineral powder, and Patent Document 4 discloses an incense coil containing 10% or more of calcium carbonate with a bulk density of 0.1 to 0.6 g / cm. 3 The mosquito coil is disclosed as a blend of the mineral powder and 5 to 30% by weight of charcoal powder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 48-72336 [Patent Document 2] Japanese Patent Application Publication No. 55-57503 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-219603 [Patent Document 4] Japanese Patent Application Publication No. 11-322505 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-mentioned conventional techniques have not yet been able to fully solve the problems of smoke, irritating odors, and scattering of ash. Furthermore, although the addition of inorganic substances such as mineral fine powders can suppress smoke generation and other problems, the incense sticks may not burn to the end due to reduced combustion characteristics and the incense sticks going out.

[0006] Furthermore, when incense is used in a closed space such as a room or a semi-closed space such as a livestock shed (dog kennel, etc.), it is desirable to volatilize the active ingredient, a volatile compound, in high concentration over a short period of time (e.g., about 5 to 30 minutes) and to maintain the effect of the active ingredient for a long period of time (e.g., about 3 to 15 hours).To achieve this, it is desirable to increase the amount of incense burned per unit time.

[0007] Therefore, an object of the present invention is to provide an incense that can suppress the generation of smoke and irritating odor (smoky odor) and the scattering of ash when incense is burned, and can also volatilize volatile compounds at high concentrations in a short period of time. [Means for solving the problem]

[0008] As a result of extensive research, the inventors discovered that the above problems could be solved by using incense sticks that contain a specific amount of combustion base material and inorganic substance and are shaped like a plate, thereby completing the present invention.

[0009] That is, the present invention is characterized by the following (1) to (3). (1) A sheet-shaped incense stick containing a combustion base material, an inorganic substance, and a volatile compound, wherein the inorganic substance content is 30 to 70% by mass, the combustion base material content is 25 to 60% by mass, and the thickness is 2 mm or more but less than 5 mm. (2) The vapor pressure of the volatile compound at 25°C is 2.0 x 10 -4 ~2.0×10 -2 The sheet-shaped incense stick according to (1) above, which is Pa. (3) The plate-shaped incense stick according to (1) or (2) above, having corners forming acute angles of 50° or less. [Effects of the Invention]

[0010] The plate-shaped incense of the present invention can be burned without going out, and furthermore, the generation of smoke and irritating odors during combustion, as well as scattering of ash, can be suppressed. Furthermore, because of its plate-like shape, volatile compounds can be efficiently vaporized, and the volatile compounds can be vaporized to a high concentration in a short period of time. [Brief explanation of the drawings]

[0011] [Figure 1] 1A and 1B are diagrams for explaining the shape of a flat incense stick according to the present embodiment, in which (a) is a perspective view and (b) is a plan view. [Figure 2] 1 is a photograph showing the results of a test on ash scattering in Test Example 1. [Figure 3] FIG. 10 is a schematic diagram illustrating the test chamber used in Test Example 4. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the sheet-shaped incense stick of the present invention will be described in detail.

[0013] The plate-shaped incense stick of the present invention contains a combustion base material, an inorganic substance, and a volatile compound as an active ingredient, and is formed into a plate shape having a thickness of 2 mm to less than 5 mm. Here, the active ingredient refers to a substance that exerts a desired effect such as insecticidal, insect repellent, anti-fungal, aromatic, or deodorizing effect when the plate-shaped incense stick is burned. Each component will be explained below.

[0014] (Combustion base material) The combustion base material may be any conventionally known combustion base material that can be used for incense sticks, and examples thereof include wood powders such as cedar, camphor, fir, sandalwood, spruce, and birch; plant powders such as pyrethrum extract powder (powdered lees), coconut powder, tea leaves, and coffee bean husks; activated carbon powders such as charcoal, bamboo charcoal, and coconut shell charcoal; etc. These may be used alone or in combination of two or more.

[0015] The combustion base material is contained in the sheet incense stick in a range of 25 to 60% by mass. When the content of the combustion base material is 25% by mass or more, the incense stick maintains good ignition properties and is less likely to go out during combustion. When the content of the combustion base material is 60% by mass or less, the generation of smoke and irritating odors during combustion can be suppressed. The lower limit of the content of the combustion base material is more preferably 30% by mass or more, and the upper limit is more preferably 55% by mass or less.

[0016] (inorganic) Examples of inorganic substances include inorganic powders such as calcium carbonate, magnesium carbonate, aluminum oxide, and calcium sulfate; and mineral powders such as perlite, talc, clay, bentonite, silicic anhydride, clay, diatomaceous earth, and kaolin. These may be used alone or in combination of two or more. Among these, calcium carbonate is preferably used from the viewpoints of suppressing the irritating odor of smoke and providing stable combustibility.

[0017] The inorganic substance is contained in the sheet incense stick in a range of 30 to 70% by mass. If the content of the inorganic substance is 30% by mass or more, the generation of smoke and irritating odor during combustion is suppressed, and scattering of ash after combustion can also be suppressed. Furthermore, if the content of the inorganic substance is 70% by mass or less, the flame is less likely to go out during combustion and can be burned to the end. The lower limit of the content of the inorganic substance is more preferably 35% by mass or more, and the upper limit is more preferably 60% by mass or less, and even more preferably 55% by mass or less.

[0018] (volatile compounds) The volatile compound contained in the sheet-shaped incense stick of the present invention is not particularly limited, and may be selected from various known substances depending on the intended use, as long as it has volatility. Examples include insecticidal components, pest repellent components, antifungal components, fragrance components, deodorizing components, etc., and these may be used alone or in combination of two or more.

[0019] Examples of the insecticidal component include pyrethroid insecticides such as metofluthrin, profluthrin, empenthrin, transfluthrin, telarethrin, pyrethrin, allethrin, furamethrin, dimefluthrin, tetraflumethrin, and mepafluthrin.

[0020] Examples of pest repellent components include DEET, dimethyl phthalate, p-menthane-3,8-diol, 3-(Nn-butyl-N-acetyl)aminopropionic acid ethyl ester, and 2-(2-hydroxyethyl)-1-piperidinecarboxylic acid 1-methylpropyl ester.

[0021] Examples of antifungal components include isopropylmethylphenol and orthophenylphenol.

[0022] Examples of fragrance components include animal fragrances such as musk, civet, ambergris, and castoreum; natural fragrances consisting of plant essential oils such as orange oil, chamomile oil, grapefruit oil, citronella oil, jasmine oil, vanilla oil, sandalwood oil, peppermint oil, peppermint oil, lavender oil, lemon oil, lemongrass oil, rose oil, rosemary oil, baeksan oil, agarwood oil, geranium oil, and ylang-ylang oil; eugenol, geraniol, citral, citronellal, damascone, vanillin, α-pinene, β-pinene, menthol, limonene, linalool, hinokitiol, ethyl acetoacetate, acetophenone, anisaldehyde, α-myrcinnamaldehyde, and methyl anthranilate. Chill, ionone, isoeugenol, isoamyl isovalerate, ethyl isovalerate, isothiocyanates, allyl isothiocyanate, isobutanol, indole and its derivatives, γ-undecalactone, 2-ethyl 3-dimethylpyrazine, 2-ethyl 5-dimethylpyrazine, 2-ethyl 6-dimethylpyrazine, ethyl vanillin octanal, ethyl octanoate, geranyl formate, citronellyl formate, cinnamic acid, ethyl cinnamate, isoamyl acetate, ethyl acetate, geranyl acetate, cyclohexynyl acetate, citronellyl acetate, cinnamyl acetate, terpinyl acetate, phenethyl acetate, butyl acetate, benzyl acetate, l-menthyl acetate, linalyl acetate, methyl salicylate, allyl cyclohexylpropionate, citronellol, 1,8 Examples of synthetic fragrances include cineole, cinnamyl alcohol, cinnamaldehyde, decanal, decanol, ethyl decanoate, 3,5,6-tetramethylpyrazine, terpineol, γ-nanolactone, para-methylacetophenone, hydroxycitronellal, hydroxycitronellal dimethyl acetal, piperonal, isoamyl phenylacetate, isobutyl phenylacetate, ethyl phenylacetate, propionic acid, isoamyl propionate, ethyl propionate, benzyl propionate, hexanoic acid, allyl hexanoate, ethyl hexanoate, l-perillaldehyde, benzyl alcohol, benzaldehyde, borneol, maltol, methyl N-methylanthranilate, methyl β-naphthyl ketone, butyric acid, isoamyl butyrate, ethyl butyrate, cyclohexyl butyrate, and butyl butyrate.

[0023] Examples of deodorizing ingredients include lauryl methacrylate, geranyl crotonate, catechin, and polyphenols.

[0024] In the present invention, the volatile compound has a vapor pressure of 2.0×10 at 25°C. -5 ~5.0×10 -2 It is preferable to use a volatile compound having a vapor pressure of 2.0 × 10 Pa at 25°C. -5 If the vapor pressure at 25°C is less than 2.0 x 10 Pa, it is difficult to volatilize. -5 If the vapor pressure of the volatile compounds is 5.0×10 Pa or more, they will volatilize easily when heated, and the volatile compounds will be released as the sheet incense sticks burn. This is particularly preferable when used in a closed space such as a room or a semi-closed space such as a livestock shed, as the volatile compounds will volatilize and adhere to the walls and ceiling of the space, thereby achieving the desired effect. In addition, if the vapor pressure of the volatile compounds at 25°C is 5.0×10 -2 If the vapor pressure at 25°C is 2.0 x 10 Pa or less, the effect of the volatilized volatile compounds is likely to be sustained. -5 ~5.0×10 -2 Examples of volatile compounds with Pa include insecticides such as metofluthrin (1.96 × 10 -3 Pa), transfluthrin (3.47 × 10 -3 Pa), allethrin (1.5 × 10 -3 Pa), empenthrin (2.2 × 10 -2 Pa), profluthrin (1.0 × 10 -2 Pa) and others. The lower limit of the vapor pressure is 1.0 x 10 -4 Pa or more is more preferable, 2.0 × 10 -4 Pa or more is more preferable, and the upper limit is 3.0 × 10 -2 Pa or less is more preferable, and 2.0×10 -2 More preferably, the vapor pressure is 2.0×10 Pa or less. -4 ~2.0×10 -2 The use of a material having a Pa value is preferred because it can effectively volatilize volatile compounds.

[0025] The content of the volatile compound may be appropriately determined depending on the type of volatile compound, the intended use, etc., but is preferably 0.01% by mass or more in the sheet incense. When the content of the volatile compound is 0.01% by mass or more, an effective amount of the volatile compound can be evaporated into the usage space. The content of the volatile compound is more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. There is no particular upper limit to the content of the volatile compound as long as the effects of the present invention can be achieved, but for example, it is preferably 5.0% by mass or less, and more preferably 1.0% by mass or less.

[0026] (binder) The sheet-shaped incense stick of the present invention preferably contains a binder to bind and solidify the raw materials. Examples of binders include tabu powder, starch, corn starch, guar gum, pine resin, carboxymethyl cellulose, methyl cellulose, mannan, various gums, casein, water-soluble polymers, etc. These may be used alone or in combination of two or more.

[0027] From the viewpoints of ease of molding and suppression of the irritating odor of smoke, the content of the binder in the sheet-shaped incense stick is preferably 3 to 30 mass %, more preferably 5 to 25 mass %, and even more preferably 10 to 20 mass %.

[0028] (Other ingredients) The sheet-shaped incense stick of the present invention may contain other ingredients, such as emulsifiers, preservatives, and colorants, to the extent that they do not affect the effects of the present invention.

[0029] Examples of emulsifiers include surfactants such as sorbitan monostearate, polyoxyethylene sorbitan monococonut oil fatty acid, and polyoxyethylene sorbitan monooleate.

[0030] Examples of preservatives include parahydroxybenzoic acid esters such as methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, and butyl p-hydroxybenzoate, isopropylmethylphenol, orthophenylphenol, isopropylmethylphenol, parachlorometaxylenol (PCMX), 3-iodo-2-propynyl butylcarbamate (IPBC), chlorhexidine gluconate, chlorhexidine hydrochloride, sorbic acid, dehydroacetic acid, and salts thereof.

[0031] Examples of colorants include legal dyes such as Red No. 106, Red No. 102, Blue No. 1, Blue No. 2, Yellow No. 5, Yellow No. 4, Yellow 202 (1), Yellow 202 (2), Green No. 3, Green No. 201, Green No. 204, Green No. 205, Green No. 401, Green No. 402, Orange No. 207, and Black No. 401, as well as malachite green.

[0032] (Manufacturing method) The tabular incense sticks of the present invention can be produced, for example, by: 1) a method of producing by batch mixing, in which incense stick raw materials are kneaded together, if necessary, with the addition of water, and the resulting mixture is molded using an extrusion molding machine, a punching machine, or the like, and dried; or 2) a method of producing by adding an active ingredient to a base incense stick, in which raw materials other than the active ingredient volatile compound are kneaded together, if necessary, with the addition of water, and the mixture is molded using an extrusion molding machine, a punching machine, or the like, dried, and then impregnated with the volatile compound.

[0033] <Manufacturing incense ingredients by mixing them all at once> In this manufacturing method, the raw materials are mixed in a predetermined ratio, and the mixture is thoroughly kneaded by adding water or warm water as necessary. The resulting kneaded product is molded using an extruder, a punching machine, or the like, and then dried. The conditions for each step can be the same as those used in the production of conventional incense.

[0034] <Manufacturing by adding active ingredients to base incense> In this manufacturing method, first, raw materials other than the active ingredient, the volatile compound, are thoroughly kneaded, optionally with water, and then molded using an extruder, a punching machine, or the like, and dried to obtain a base incense stick. The base incense stick is then impregnated with the volatile compound. The conditions for the process of producing the base incense may be the same as those for producing conventional incense.

[0035] In this manufacturing method, it is preferable to use an organic solvent in combination with the volatile compound when impregnating the base incense stick with the volatile compound. By using the volatile compound in combination with an organic solvent, the diffusibility of the volatile compound into the base incense stick is increased, and traces of the chemical solution on the surface of the incense stick can be made less noticeable, thereby suppressing poor appearance.

[0036] It is preferable to use a volatile organic solvent with a viscosity at 20°C in the range of 1.1 to 150 mPa·s. A viscosity of 1.1 mPa·s or higher provides good diffusibility in the base incense, making it easier to diffuse the volatile compound throughout the base incense, while a viscosity of 150 mPa·s or lower is preferable because it prevents a decrease in diffusibility in the base incense. The lower limit of the viscosity of the organic solvent is more preferably 3.0 mPa·s or higher, and even more preferably 5.0 mPa·s or higher, while the upper limit is more preferably 70 mPa·s or lower, and even more preferably 10 mPa·s or lower. The viscosity can be measured by a capillary viscometer, a rotational viscometer, or the like.

[0037] The organic solvent preferably has a vapor pressure in the range of 0.0001 to 200 hPa at 25°C. A vapor pressure of 0.0001 hPa or higher is preferred because it accelerates the evaporation rate of the organic solvent, while a vapor pressure of 200 hPa or lower is preferred because it reduces the evaporation rate of the organic solvent. The lower limit of the vapor pressure of the organic solvent is preferably 0.0002 hPa or higher, and the upper limit is preferably 100 hPa or lower.

[0038] Specific examples of preferred organic solvents include 3-methoxy-3-methyl-1-butanol, benzyl alcohol, ethanol, dipropylene glycol, and benzyl benzoate.

[0039] The organic solvent is preferably used so that the mass ratio of the volatile compound to the organic solvent (volatile compound:organic solvent) is in the range of 1:0.5 to 1:50. When the mass ratio of the volatile compound to the organic solvent is in this range, poor appearance can be suppressed and the agent can be added uniformly to the incense base. The ratio is more preferably in the range of 1:1 to 1:40, and even more preferably in the range of 1:1.5 to 1:20.

[0040] In the step of impregnating the base incense stick with the volatile compound, the volatile compound may be added to the base incense stick in the form of a mixed liquid obtained by mixing the volatile compound with an organic solvent, or the volatile compound may be added to the base incense stick and then the organic solvent may be added, or the organic solvent may be added to the base incense stick and then the volatile compound may be added. When the volatile compound and the organic solvent are added separately to the base incense stick, it is preferable to add one of them within 24 hours after adding the other. Among these, from the viewpoint of the diffusibility of the volatile compound within the base incense stick, the method of adding a mixture of the volatile compound and an organic solvent, and the method of adding the volatile compound and then the organic solvent are preferred, and from the viewpoint of production efficiency, the method of adding a mixture of the volatile compound and an organic solvent is preferred.

[0041] The method for adding the volatile compound and the organic solvent to the base incense stick is not particularly limited, but examples thereof include a method of adding the compound and the organic solvent in droplet form, a method of spraying the compound, and a method of immersing the base incense stick.

[0042] (Shape of incense sticks) The plate-shaped incense stick of the present invention is characterized by being in the form of a plate having a thickness of 2 mm or more but less than 5 mm. Here, "plate-shaped" means that the front and back surfaces (top and bottom main surfaces) are substantially or approximately flat (flat), and the outer shape may be any of a square, parallelogram (e.g., rhombus), polygon, circle, and a mixture of these shapes (e.g., a teardrop shape in which the base of an approximately isosceles triangle is approximately semicircular). Furthermore, "substantially flat" includes the front and back surfaces being concavely or convexly curved. Furthermore, the surface may be wavy or uneven, as long as it does not affect the effects of the present invention.

[0043] By using a sheet-shaped incense stick, if the cross-sectional area of ​​the burning part is the same, the distance from the center of the cross section to the surface of the incense stick is shorter than that of a stick-shaped incense stick, etc., and this prevents the loss of volatile compounds that do not volatilize from inside the incense stick, allowing the volatile compounds to be volatilized efficiently and at high concentrations in a short period of time.

[0044] Next, the shape of the sheet-shaped incense stick of this embodiment will be described with reference to the drawings. FIG. 1 is a diagram for explaining the shape of the sheet-shaped incense stick of this embodiment, where (a) is a perspective view and (b) is a plan view. As shown in Figures 1(a) and (b), the plate-shaped incense stick 1 of this embodiment is a thin plate with its main surfaces, the front surface 2 and the back surface 3, each having an approximately triangular shape, and has an approximately uniform thickness throughout.

[0045] The thickness t of the sheet incense stick 1 is 2 mm or more and less than 5 mm. If the thickness of the sheet incense stick is less than 2 mm, it may break easily upon impact, so the thickness is set to 2 mm or more. Furthermore, if the thickness is less than 5 mm, it is less likely to go out during burning and can be burned to the end. The lower limit of the thickness of the sheet incense stick is preferably 2.5 mm or more, and the upper limit is preferably 4 mm or less.

[0046] Furthermore, the maximum length L of the main surfaces 2, 3 of the plate-shaped incense stick 1 can be adjusted appropriately taking into consideration the set burning time of the plate-shaped incense stick. From the viewpoint of ease of handling and shortening the burning time, however, it is preferable that it is, for example, 60 mm or less, and more preferably 25 to 50 mm.

[0047] When viewed from the main surfaces 2 and 3 (the flat surface side), the flat incense stick 1 of this embodiment preferably has a corner 5 that forms an acute angle of 50° or less (i.e., a corner with an interior angle θ of 50° or less), which serves as an ignition point. Ignition from a portion (corner) with an interior angle greater than 50° can be difficult, or even if ignited, the amount of heat generated during combustion per unit area is small, resulting in a slow burn and the stick going out mid-burn. Therefore, by having a corner 5 that forms an acute angle of 50° or less, ignition from the corner 5 can be improved, and the amount of heat generated during combustion can be transferred to the incense stick in a balanced manner, allowing it to burn without going out. The interior angle θ of the corner 5, which serves as the ignition point, can be adjusted taking into account the content of inorganic substances, which are incense ingredients, and the thickness of the flat incense stick. For example, when the content of inorganic substances is 50% by mass or less, the angle should be 50° or less, more preferably 10 to 45°. Furthermore, the upper limit is even more preferably 40° or less. When the content of inorganic matter is more than 50 mass % and not more than 60 mass %, the interior angle θ of the corner 5 that becomes the ignition point is more preferably not more than 40°, and even more preferably 10 to 30°.

[0048] (Using incense sticks) The tabular incense stick of the present invention is ignited and burned at a corner of the tabular incense stick, specifically at a corner forming an acute angle of 50° or less, to volatilize the volatile compound, which is the active ingredient. According to the method of burning the tabular incense stick of the present invention, the generation of smoke and irritating odor as well as scattering of ash during incense burning are suppressed, resulting in excellent combustibility of the incense stick, and the adhesion time of the volatile compound to the walls, ceiling, etc. of a room is increased, resulting in the desired effect lasting for a long time.

[0049] Furthermore, by appropriately adjusting the maximum length and shape of the sheet-shaped incense stick of the present invention, the time from ignition to the end of combustion can be adjusted to within 30 minutes, preferably within 20 minutes. According to this embodiment, it is possible to supply a large amount of volatile compounds into a room in a short period of time. Therefore, it is possible to avoid a situation in which the user is exposed to the smoke and irritating odor generated when the incense stick burns for a long period of time. This is particularly suitable for use in closed spaces such as rooms or semi-closed spaces such as livestock sheds, where the above-mentioned effects can be avoided. The amount of the sheet incense stick used in a room may be determined appropriately depending on the size of the room and the purpose of the sheet incense stick. For example, 3 The amount of sheet incense used in an indoor space is preferably about 0.3 to 2.0 g. [Example]

[0050] The present invention will be further explained below with reference to examples, but the present invention is not limited to the following examples in any way.

[0051] <Test Example 1: Ash scattering prevention> (Making incense sticks) Based on each of the formulations 1 to 3 shown in Table 1, wood flour, coconut powder, calcium carbonate, and tabu (joss) flour were weighed out and mixed uniformly in a kneading container to obtain a mixed powder. Water equivalent to 60% by mass of the mixed powder was added, and the mixture was kneaded until uniform to obtain a kneaded product. The mixture was formed into an isosceles triangle in plan view, as shown in Figures 1(a) and 1(b), with a thickness t of 3 mm, a maximum length L of the main surfaces 2 and 3 of 40 mm, and an interior angle θ of the corner 5, which serves as the ignition point, of 30°.Then, it was dried for 10 hours under a gentle breeze at 65°C to produce a plate-shaped incense stick weighing approximately 1.5 g.

[0052] (Test Method) The ignition point (corner 5) of the sheet incense was ignited, and the entire incense was burned to ash. A wind at a speed of 2 m / s was blown onto the ashed incense from a distance of 0.5 m for 30 seconds, and the scattering of ash was evaluated. If the ash crumbled or moved 10 cm or more when exposed to the wind, it was evaluated as "X", and if the ash did not crumble or move, it was evaluated as "O". The results are shown in Table 1. The condition of each incense after the test is also shown in Figure 2.

[0053] [Table 1]

[0054] As shown in Table 1 and Figure 2, the ash of the sheet incense sticks made according to Formula 1 (containing 20% ​​by mass of calcium carbonate) was brittle, and it was confirmed that the ash scattered by the wind. In contrast, the sheet incense sticks made according to Formula 2 (containing 30% by mass of calcium carbonate) and the sheet incense sticks made according to Formula 3 (containing 50% by mass of calcium carbonate) did not have ash scattered by the wind, confirming that scattering of ash after combustion can be suppressed. This shows that as the calcium carbonate content increases, the ash after combustion tends to become harder.

[0055] <Test Example 2: Flammability Test> (Making incense sticks) Based on each of the formulation examples of formulations 4 to 6 shown in Table 2, each component was weighed out, placed in a kneading container, and mixed uniformly to obtain a mixed powder. Water equivalent to 60% by mass of the mixed powder was added, and the mixture was kneaded until uniform, obtaining a kneaded product. Formulation 4 is the same formulation as formulation 3 in Test Example 1.

[0056] [Table 2]

[0057] The mixture was molded into an isosceles triangle in plan view, with a thickness t of 3 mm, a maximum length L of the main faces 2 and 3 of 40 mm, and an interior angle θ of the corner 5 of 30°, 40°, 50°, 60°, or 70°, as shown in Figures 1(a) and 1(b). The mixture was then dried for 10 hours in a gentle breeze at 65°C to produce incense sticks in the form of plates. Similarly, plate-shaped incense sticks were prepared with thicknesses t changed to 4 mm and 5 mm. For Formulation Example 6, plate-shaped incense sticks with thicknesses t of 3 mm and 5 mm were prepared.

[0058] (Test Method) The above-prepared sheet-shaped incense sticks were ignited at the corner 5, and it was checked whether all of the various incense sticks burned. If all of the incense sticks burned, they were evaluated as "Good", and if they went out midway through burning, they were evaluated as "Poor". The results are shown in Tables 3 to 5.

[0059] [Table 3]

[0060] [Table 4]

[0061] [Table 5]

[0062] As shown in Tables 3 to 5, the sheet-shaped incense sticks with a thickness of 5 mm went out during combustion in all formulations and could not be burned to the end. Formulation 4 is an example (corresponding to an example) containing 35% by mass of the combustion base material and 50% by mass of calcium carbonate. When the ignition point was a corner with an interior angle of 50°, the plate-shaped incense stick molded from the kneaded product of Formulation 4 was able to completely burn in both thicknesses of 3 mm and 4 mm. When ignited at a corner with an interior angle of 60°, the plate-shaped incense stick was able to completely burn in both thicknesses of 3 mm, but went out halfway through when ignited at a corner with an interior angle of 60°. Formulation 5 is an example (corresponding to an example) containing 28% by mass of the combustion base material and 60% by mass of calcium carbonate. When the ignition point was a corner with an interior angle of 30°, the plate-shaped incense stick was able to completely burn in both thicknesses of 3 mm and 4 mm. When ignited at a corner with an interior angle of 40°, the plate-shaped incense stick was able to completely burn in both thicknesses of 3 mm, but went out halfway through when ignited at a corner with an interior angle of 40°. Formulation 6 is an example (equivalent to a comparative example) containing 21% by mass of the combustion base material and 70% by mass of calcium carbonate. The sheet-shaped incense sticks formed from the kneaded product of Formulation 6 could not be completely burned regardless of the inner angle of the corner of the ignition point.

[0063] These results suggest that there are optimal ranges for the content of combustion base material and inorganic substance, the inner angle of the ignition point in the shape of an incense stick, and the thickness of the incense stick. For example, it was found that the thickness of a plate-shaped incense stick should be 4 mm or less, and if the content of inorganic substance is 50% by mass or less, it is preferable that the inner angle of the ignition point be 60° or less, and if the content of inorganic substance is more than 50% by mass but not more than 60% by mass, it is preferable that the inner angle of the ignition point be 40° or less.

[0064] <Test Example 3: Confirmation test of irritating odor generation from sheet incense> (Making incense sticks) Based on each of the formulation examples of formulations 7 to 12 shown in Table 6, each component was weighed out, placed in a kneading container, and mixed uniformly to obtain a mixed powder. Water equivalent to 60% by mass of the mixed powder was added, and the mixture was kneaded until uniform, obtaining a kneaded product. Formulation 10 is the same formulation as formulation 3 in Test Example 1. The mixture was molded in the same manner as in Test Example 1 to obtain sheet-shaped incense sticks.

[0065] [Table 6]

[0066] (Test Method) The test room was a 6-tatami room (space volume = 23 m 3 The test chamber was partitioned and sealed to prevent air circulation. A flat incense stick was placed in an incense holder, placed in the center of the test chamber, ignited at the ignition point, and allowed to burn with the test chamber closed. After two hours, the appearance of the burned incense stick was checked to see if it had gone out. If it had burned completely, it was rated as "Good", and if it had gone out halfway through, it was rated as "Poor". For those that were rated "○" for extinguishing, the panel checked the smoky odor (pungent odor) in the test room. If no smoky odor was detected, the test was rated "◎", if the smoky odor was detected but not bothersome, the test was rated "○", and if the smoky odor was detected, the test was rated "×". The results are shown in Table 7.

[0067] [Table 7]

[0068] Formulations 9 to 11 are examples (corresponding to Examples) in which the content of the combustion base material is in the range of 25 to 60% by mass and the content of calcium carbonate is in the range of 30 to 70% by mass. The sheet-shaped incense sticks molded from these formulations did not emit a smoky odor, did not go out, and showed good combustion properties. In contrast, Formulation 7 is an example in which both the combustion base material and calcium carbonate are outside the above ranges, Formulation Example 8 has a calcium carbonate content outside the above range, and Formulation Example 12 has a combustion base material content outside the above range. The sheet-shaped incense sticks formed from Formulations 7 and 8 resulted in a worsening smoky odor, and the incense stick formula formed from Formulation 12 went out mid-burn, and none of them were able to achieve both good combustion properties and suppressed smoky odor at the same time.

[0069] The results of Test Examples 1 to 3 show that flat incense sticks containing 25 to 60% by mass of combustion base material and 30 to 70% by mass of inorganic material and having a thickness of 2 mm or more and less than 5 mm have a reduced smoky odor during combustion, good combustion properties, and can suppress scattering of ash. Note that flat incense sticks with such a configuration can achieve the same effects even if they contain a volatile compound as an active ingredient.

[0070] <Test Example 4: Efficacy test of sheet incense containing active ingredients> (Making incense sticks) 20 g of wood flour, 15 g of coconut powder, 15 g of tabu (joss) flour, and 50 g of calcium carbonate were weighed out, added to the incense stick so that the metofluthrin content was 0.4% by mass, and mixed uniformly in a kneading container to obtain a mixed powder. Water equivalent to 60% by mass of the mixed powder was added, and the mixture was kneaded until uniform. The mixture was formed into an isosceles triangle in plan view, as shown in Figures 1(a) and 1(b), with a thickness t of 3 mm, a maximum length L of the main surfaces 2 and 3 of 40 mm, and an internal angle θ of the corner 5, which serves as the ignition point, of 30°.Then, it was dried for 10 hours under a gentle breeze at 65°C to prepare a plate-shaped incense stick (sample incense stick).

[0071] (Test Method) As test insects, polyester cage 6 (14 mesh, 23 cm x 23 cm PET net folded in half to form a bag) containing about 20 Culex pipiens mosquitoes was prepared. As shown in Figure 3, an 8-tatami room (3.6m x 3.6m x 2.4m height = 31.1m) 3 In a test chamber 10 of the same building, four polyester cages 6 containing Culex pipiens pallens were placed diagonally, two at a height of 75 cm and two at a height of 150 cm from the floor of the test chamber 10. A flat incense stick was placed in an incense holder and placed in the center 7 of the floor of the test chamber 10. It was ignited at the ignition point and allowed to burn with the test chamber 10 closed. The number of dead insects was monitored every 10 minutes for two hours after the start of the test. After two hours, the test insects were moved to a separate room at approximately 25°C and given 1% sugar water. The number of dead insects was monitored for 24 hours. Six hours after the ignition, a polyester cage 6 containing approximately 20 Culex pipiens mosquitoes was placed in the test chamber 10, and the same test was conducted for two hours after the placement (i.e., for two hours from six hours to eight hours after the ignition). Furthermore, the same test was conducted 12 hours after the ignition. The test was performed twice, and the knockdown rate and lethality rate were calculated from the total number of results obtained. The KT was calculated using the Probit method based on the knockdown rate over time. 50 Value and KT 90 The values ​​were calculated and the results are shown in Table 8.

[0072] [Table 8]

[0073] As shown in Table 8, the KT50 value was 19.8 minutes and the KT90 value was 44.7 minutes after 12 to 14 hours, demonstrating high efficacy. Furthermore, the 24-hour mortality rate was 100% after 0 to 2 hours and 6 to 8 hours, and 99.3% after 12 to 14 hours, demonstrating high mortality rates in all cases. From the above, it was confirmed that the sheet-shaped incense sticks of the present invention exhibit a high extermination effect in an 8-tatami room.

[0074] <Test Example 5: Checking the appearance of sheet incense sticks by adding active ingredients to base incense sticks> (Making incense sticks) 24g of wood flour, 19g of coconut powder, 11g of tabu flour (joss flour), and 46g of calcium carbonate were weighed into a kneading vessel and mixed uniformly to obtain a mixed powder. Water equivalent to 60% by mass of the mixed powder was added, and the mixture was kneaded until uniform. The mixture was formed into an isosceles triangle in plan view, as shown in Figures 1(a) and 1(b), with a thickness t of 3 mm, a maximum length L of the main surfaces 2 and 3 of 40 mm, and an interior angle θ of the corner 5, which serves as the ignition point, of 30°, and then dried for 10 hours in a gentle breeze at 65°C to produce a base incense stick. Metofluthrin and the solvents shown in Table 9 were mixed at a mass ratio of 1:2.5 to prepare a mixed liquid. The base incense sticks were placed on a tray, and 21 mg of the mixed liquid was added dropwise (Metofluthrin content in the incense sticks: 0.4% by mass). After about 1 minute, the tray lid was closed and the sticks were aged at 50°C for 1 hour to produce plate-shaped incense sticks (test incense sticks).

[0075] (Test Method) The appearance of the prepared sheet incense sticks (test incense sticks) was visually inspected and evaluated based on the following criteria. For comparison, sheet incense sticks were prepared by adding 6 mg of metofluthrin to a base incense stick and aging it at 50°C for 1 hour. The results are shown in Table 9. [Evaluation criteria] ○: The drip marks have almost disappeared and are no longer visible. △: Drip marks can be seen, but are thinner than those of the comparison object. ×: There is an infusion mark that is the same as the comparison subject.

[0076] [Table 9]

[0077] The results in Table 9 show that when the active ingredient, a volatile compound, is added to the base incense stick together with an organic solvent, the active ingredient can be impregnated into the base incense stick without leaving any traces of dripping liquid. Furthermore, when these sheet-shaped incense sticks were tested for efficacy against Culex pipiens mosquitoes using the same test method as in Test Example 4, all of them showed excellent extermination effects. [Explanation of symbols]

[0078] 1. Incense sticks 2. Surface (main surface) 3 Back side (main surface) 5. Corners with an acute angle of 50° or less 6 Polyester cages 7 Central part 10 Testing Room t thickness L Maximum length of the main surface

Claims

1. A plate-shaped incense stick (excluding spiral-shaped sticks) containing a combustion base material, an inorganic substance, and a volatile compound, wherein the inorganic substance comprises calcium carbonate, the inorganic substance content is 30 to 70% by mass, the combustion base material content is 30 to 60% by mass, the thickness is 2 mm to 4 mm, the maximum length of the main surface is 60 mm or less, and the stick has corners forming acute angles of 50° or less.

2. 2. The sheet-shaped incense stick according to claim 1, wherein the content of the volatile compound is 0.4% by mass or more.

3. The vapor pressure of the volatile compound at 25°C is 2.0 x 10 －４ ~2.0 x 10 －２ The sheet-shaped incense stick according to claim 1 or 2, wherein the incense stick is Pa.

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