JP7362063B2 - insect trap sheet - Google Patents

Description

The present invention relates to an insect trapping sheet.

Conventionally, insect traps have been used which are equipped with a light source that emits ultraviolet light and an adhesive sheet for trapping insects, and which attract insects with the ultraviolet light and trap the insects with the adhesive sheet. Such an insect trap includes a base sheet, a coating film containing, for example, a yellow-toned fluorescent pigment formed on at least one surface of the base sheet, and an adhesive sheet having an adhesive layer provided on the coating film. (See Patent Document 1). Insect-trapping adhesives are irradiated with large amounts of ultraviolet rays to attract insects, and the insects attracted by the ultraviolet rays reflected by fluorescent pigments are captured in the adhesive layer.

Japanese Patent Application Publication No. 8-51909

Organic pigments are generally used as the fluorescent pigments contained in the coating of the pressure-sensitive adhesive sheet from the viewpoints of cost and manufacturing method. Fluorescent organic pigments have small particle sizes and poor ultraviolet shielding properties. For this reason, there is a concern that the plastic sheet used as the base material of the adhesive sheet becomes brittle due to ultraviolet rays.
In addition, a pressure-sensitive adhesive sheet on which a coating film containing a fluorescent pigment is formed has a high brightness, for example, a yellowish tone, making it easier to see insects captured on the pressure-sensitive adhesive sheet. Therefore, discomfort may occur when replacing the adhesive sheet.

The present invention has been proposed in view of these problems, and its purpose is to provide an insect trapping sheet that is excellent in suppressing deterioration caused by ultraviolet light and in which trapped insects are difficult to see.

An insect repellent sheet according to one aspect of the present invention includes a base material that does not contain a pigment that imparts color , a reflective sheet that includes a metallic material, and a reflective sheet that includes a metallic material. layer, and an adhesive layer provided on the surface of the reflective layer opposite to the base material, the reflective layer has an average reflectance of 45% or more for ultraviolet light having a wavelength of 330 nm or more and 370 nm or less, It is characterized by an average transmittance of 0.7% or less for ultraviolet light having a wavelength of 290 nm or more and 330 nm or less.

An insect repellent sheet according to another aspect of the present invention includes a base material made of a resin material that contains an ultraviolet absorber or a light stabilizer and does not contain a pigment that imparts color, and an entire surface on one side of the base material. The reflective layer includes a reflective layer that is provided in close contact with the base material and includes a metal material, and an adhesive layer that is provided on the other surface of the base material, and the reflective layer has an ultraviolet ray having a wavelength in the range of 330 nm or more and 370 nm or less. It is characterized in that the average reflectance for light is 45% or more, and the average transmittance for ultraviolet light having a wavelength of 290 nm or more and 330 nm or less is 0.7% or less.

According to the present invention, it is possible to provide an insect-trapping sheet that is excellent in suppressing deterioration caused by ultraviolet light and in which trapped insects are difficult to see.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the example of a structure of the insect trap sheet based on 1st embodiment of this invention. FIG. 2 is a cross-sectional view showing an example of the structure of the reflective layer of the insect-trapping sheet and the state of light scattering according to the first embodiment of the present invention. It is a sectional view showing one example of composition of an insect trapping sheet concerning a second embodiment of the present invention. It is a graph showing the average transmittance of ultraviolet light in each sheet of Samples 1 to 3 in Examples. It is a graph showing the average reflectance of ultraviolet light in each sheet of Samples 1 to 3 in Examples. It is a graph showing the diffuse reflectance of ultraviolet light in each sheet of Samples 1 to 3 in Examples. It is a photograph showing the appearance of the insect trapping sheet in each sheet of Sample 2 and Sample 3 after the insect trapping test.

Embodiments of the present invention will be described below with reference to the drawings. Each embodiment shown below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is such that the material, shape, structure, etc. of the component parts are as follows. It is not specific to The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.

1. First Embodiment Hereinafter, the configuration of an insect-trapping sheet 1 according to a first embodiment will be described using FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing a configuration example of an insect-trapping sheet 1 according to the present embodiment, and FIG. 2 is a cross-sectional view schematically showing how light (ultraviolet light) is reflected in the insect-trapping sheet 1. The state of incident light Li and reflected light Lr is schematically shown.

<Configuration of insect trapping sheet>
As shown in FIG. 1, the insect trapping sheet 1 includes a base material 10, a reflective layer 20 provided on at least one surface of the base material 10, and a reflective layer 20 provided on the surface opposite to the base material 10. An adhesive layer 30 is provided.
In FIG. 1, the insect trapping sheet 1 has a structure in which a base material 10, a reflective layer 20, and an adhesive layer 30 are laminated in this order, but the structure is not limited to this. For example, the insect trapping sheet 1 has a configuration in which reflective layers 20 are provided on both sides of the base material 10, and adhesive layers 30 are provided on each surface of the reflective layer 20, that is, the adhesive layer 30, the reflective layer 20, The base material 10, the reflective layer 20, and the adhesive layer 30 may be laminated in this order.

In the insect trapping sheet 1 , ultraviolet light is irradiated onto the surface on which the adhesive layer 30 is formed (hereinafter sometimes referred to as the surface of the insect trapping sheet 1 ), and reaches the reflective layer 20 via the adhesive layer 30 . The reflected ultraviolet light is reflected by the reflective layer 20. As a result, the ultraviolet light is diffusely reflected on the surface of the insect-trapping sheet 1 to produce an insect-attracting effect, and the adhesive layer 30 can trap insects.

The base material 10 is a layer that supports the reflective layer 20 and the adhesive layer 30 and serves as the base material of the insect trapping sheet.
The reflective layer 20 is a layer containing a metal material provided on at least one surface of the base material 10, and functions as an insect-attracting layer that attracts insects by reflecting ultraviolet light irradiated from a light source. The reflective layer 20 also functions as a layer that suppresses the ultraviolet light irradiated from the light source from transmitting to the base material 10 and suppresses deterioration of the base material 10.
The adhesive layer 30 is a layer that traps insects. Further, the adhesive layer 30 also functions as a layer that protects the reflective layer 20.
Each layer mentioned above will be explained in detail below.

[Base material]
The base material 10 is, for example, a resin sheet formed of a resin material. The type of resin material forming the base material 10 is not particularly limited as long as it does not impair its rigidity as a base material that supports the reflective layer 20 and the adhesive layer 30. As the base material 10, for example, a resin film formed of a polyolefin resin such as a polyethylene resin or a polypropylene resin, a polyester resin such as a polybutylene terephthalate resin or a polyethylene terephthalate resin, a resin material such as a polystyrene resin or a vinyl chloride resin, or a mixture thereof. Or a resin sheet can be mentioned. Moreover, the base material 10 may be a laminate of these resin films or resin sheets.
The resin film or resin sheet constituting the base material 10 may be unstretched, or may be a stretched film that has been stretched in a vertical or horizontal uniaxial direction, or in a biaxial direction. The resin film or resin sheet constituting the base material 10 may contain an ultraviolet absorber, a light stabilizer, an antioxidant, an antistatic agent, a slip agent, an anti-blocking agent, and the like. Further, the base material 10 may be made of a material other than a plastic sheet, for example, paper.

The thickness of the base material 10 is not particularly limited, but is preferably about 100 μm or more and 300 μm or less, more preferably 150 μm or more and 200 μm or less. When the thickness of the base material 10 is 100 μm or more, it is preferable because the base material 10 has durability against ultraviolet rays and appropriate rigidity. Moreover, when the thickness of the base material 10 is 300 μm or less, it is preferable because the base material 10 has appropriate flexibility.

The surface of the base material 10 facing the reflective layer 20 may be subjected to a corona discharge treatment, a chromic acid oxidation treatment (wet type), a flame treatment, a hot air treatment, an ozone/plasma irradiation treatment, an adhesion treatment, or the like.
By performing these treatments, the surface of the base material 10 facing the reflective layer 20 improves the wetting characteristics of a coating agent containing a metal material when forming the reflective layer 20, and improves the adhesion of the reflective layer 20 to the base material 10. will improve.
These surface treatment methods are appropriately selected depending on the type of the base material 10, but a corona discharge treatment method is preferably used from the viewpoint of the adhesion effect with the reflective layer 20 and the operability of the treatment device.
Further, the adhesion of the reflective layer 20 to the base material 10 may be improved by forming an anchor layer or a primer layer on the surface of the base material 10 facing the reflective layer 20.

Further, the base material 10 may have an uneven shape formed on the surface facing the reflective layer 20.
Examples of methods for forming the uneven shape on the base material include sandblasting, solvent treatment, and the like. Alternatively, a base material may be used in which an additive such as calcium carbonate is added to a resin material to form a film and then stretched, thereby forming irregularities due to the additive.
By using a base material having an uneven shape, the uneven shape of the base material is reflected on the surface of the reflective layer 20, and the diffuse reflection performance of the reflective layer 20 can be improved, and the range where the insect attracting effect occurs can be expanded. It becomes possible.

[Reflective layer]
The reflective layer 20 has an average reflectance of 45% or more for ultraviolet light in a wavelength range of 330 nm or more and 370 nm or less, and an average transmittance of 0.7% or less for ultraviolet light in a wavelength range of 290 nm or more and 330 nm or less. More preferably, the average transmittance for ultraviolet light having a wavelength of 300 nm or more and 320 nm or less is 0.7% or less.
Ultraviolet light having a wavelength in the range of 330 nm or more and 370 nm or less is light that is excellent for the phototactic reaction of insects. Therefore, a reflective layer 20 having an average reflectance of 45% or more for ultraviolet light in this wavelength range is preferable because it has an excellent insect attracting effect. Further, ultraviolet light with a wavelength in the range of 290 nm or more and 330 nm or less is light that easily deteriorates the resin material used for the base material 10, and ultraviolet light with a wavelength in the range of 300 nm or more and 320 nm or less deteriorates polypropylene resin in particular. It's easy light. Therefore, a reflective layer 20 having an average transmittance of 0.7% or less for ultraviolet light in this wavelength range is preferable because it has an excellent effect of suppressing deterioration of the base material 10.

The shorter the wavelength, the greater the energy of light, and photodeterioration of resin materials is caused by ultraviolet rays with short wavelengths. Since light with a wavelength shorter than 290 nm is absorbed by the ozone layer, photodeterioration of the resin material is caused by ultraviolet rays with a wavelength of 290 nm or more and 400 nm or less. The wavelength range of ultraviolet rays that degrade resin materials differs depending on the type of resin material.
The maximum wavelengths of ultraviolet rays that degrade each resin material are as follows: polyethylene 300 nm, polyvinyl chloride 310 nm, polystyrene 318 nm, polyester 325 nm, polypropylene 310 nm, vinyl chloride-vinyl acetate copolymer 322 nm to 364 nm, polyoxymethylene 300 nm or more and 320 nm or less, polycarbonate 295 nm, nitrocellulose 310 nm, polymethyl methacrylate 290 nm or more and 315 nm or less, thermoplastic resin 290 nm or more and 320 nm or less, unsaturated polyester 325 nm

In order to achieve such average reflectance and average transmittance for ultraviolet rays, the reflective layer 20 is configured to include a metal material. Further, the reflective layer 20 may contain impurities such as a binder that binds the metal materials together or residues of the solvent used when forming the reflective layer, depending on the layer formation method, and the metal material may contain resin. It may be mixed with the material.
The metal material included in the reflective layer 20 has the function of reflecting ultraviolet rays from a light source to generate an insect-attracting effect and suppressing the transmission of ultraviolet rays to the base material 10 . The metal material is not particularly limited as long as it reflects ultraviolet light, but it is preferable to use aluminum (Al), silver (Ag), copper-zinc alloy (brass, brass), etc., which are inexpensive and resistant to ultraviolet light. Aluminum (Al) is more preferable since it has a high value.

The shape of the metal material may be any shape as long as it can reflect ultraviolet light, and may be, for example, granular or flaky. From the viewpoint of enhancing the insect attracting effect, the shape of the metal material is preferably spherical, which has a higher diffused reflection effect of light. On the other hand, from the viewpoint of the flexibility of the reflective layer 20 and the manufacturing cost of the insect trapping sheet 1, the shape of the metal material is preferably a flake shape that allows the reflective layer to be formed thinly. When the metal material has a flake shape, it is more preferable to form the reflective layer 20 so that the orientation of the metal material is lower. This is because it can diffusely reflect light and further enhance the insect attracting effect.

Generally, flake-shaped aluminum materials (hereinafter referred to as aluminum flake pigments) come in leafing type and non-leafing type, but it is preferable to use non-leafing type aluminum flake pigments from the viewpoint of insect-attracting effects. Leafing-type aluminum flake pigments have low surface tension, so they have low affinity with the solvents and binders contained in paints, so they float on the surface of the paint film and are oriented almost uniformly, making it easy to totally reflect ultraviolet rays. On the other hand, non-leafing type aluminum flake pigments have a not so low surface tension and therefore have a high affinity with solvents and binders contained in paints. Therefore, the non-leafing type aluminum flake pigment is distributed in a randomly oriented state inside the coating film, and tends to diffusely reflect ultraviolet rays.

Leafing type aluminum flake pigments are produced using a grinding device such as a ball mill with a steel ball or other spherical grinding media, using saturated fatty acids such as stearic acid as a grinding aid, mineral spirit, solvent naphtha, etc. It is obtained by wet grinding aluminum powder in an organic solvent. Further, a non-leafing type aluminum flake pigment can be obtained by similar grinding using an unsaturated fatty acid such as oleic acid as a grinding aid instead of the above-mentioned saturated fatty acid.

The metal material is preferably a metal powder having an average particle size of 1 μm or more and 40 μm or less. When the average particle size of the metal material is 1 μm or more, it is preferable because the effect of suppressing reflection of ultraviolet rays and transmission to the base material 10 is excellent. Further, it is preferable that the average particle size of the metal material is 40 μm or less, since it provides excellent coating properties when forming the reflective layer 20 of the metal material by a coating method (details will be described later).
Here, in this embodiment, the average particle diameter refers to a mode diameter (recurrence particle diameter).
Further, when the metal material has a flake shape, the average particle size (mode diameter) refers to the average length of the long axis portion among the long axis, short axis, and thickness.

The reflective layer 20 preferably has a visual density of 0.35 or more. Thereby, the reflective layer 20 improves the average reflectance of ultraviolet rays to enhance the insect attracting effect, and reduces the average transmittance of ultraviolet rays to the base material 10 to suppress deterioration of the base material 10. Furthermore, since the brightness of the adhesive sheet insect trapping sheet 1 can be lowered, the visibility of the trapped insects can be lowered.

The film thickness of the metal material of the reflective layer 20 with respect to the base material 10 (dry film thickness after application of the metal material) is preferably 0.5 μm or more and 25 μm or less. By setting the film thickness of the metal material to 0.5 μm or more, it is possible to improve the coverage rate with the metal material, improve the insect attracting effect, suppress deterioration of the base material 10, and reduce the visibility of captured insects. can.
Further, by setting the thickness of the metal material to 25 μm or less, the reflective layer 20 can be formed thin. As a result, the reflective layer 20 is formed with high flexibility, making it difficult for the reflective layer 20 to be damaged (cracking or peeling off of the metal material), and reducing the amount of metal material used to reduce manufacturing costs. can.

Further, the thickness of the reflective layer 20 varies depending on the amount (concentration) of the metal material added to the coating agent containing the metal material and the particle size of the metal material. Therefore, in addition to the film thickness management index, the visual density of the metal material can also be used as an index. The visual density of the metal material is preferably 0.35 or higher. When the visual density is 0.35 or more, it is possible to improve the coverage rate of the metal material on the base material 10 and improve the insect attracting effect, suppressing deterioration of the base material 10 and improving the visibility of captured insects. It is possible to reduce the
For example, when forming the reflective layer 20 by an offset printing method using a coating agent containing a flake-shaped metal material, the amount of the metal material added in the coating agent is 20% by weight, the average particle diameter of the metal material (mode When the diameter) is 6 μm and the coating film thickness is 1 μm, a visual density of about 0.6 can be obtained.

The reflective layer 20 is, for example, a layer formed by binding metal shapes with a binder. In this case, the binder may be any common material, such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-propylene-diene rubber (EPDM), styrene-butadiene rubber (SBR), or nitrile. It is preferable to use chemically and physically stable materials such as butadiene rubber (NBR) and fluororubber. Note that since the adhesive layer 30 has excellent resistance to ultraviolet light and is highly effective in protecting the reflective layer 20, the binder is not necessarily limited to a material that has excellent resistance to ultraviolet light.

Further, the reflective layer 20 may be a layer formed of a resin material mixed with a metal material. In this case, examples of the resin material include thermosetting resins and ultraviolet curable resins. Epoxy resins are generally used as thermosetting resins, but there are no particular limitations as long as they are liquid at room temperature. be able to. Examples of UV-curable resins include epoxy acrylate-based, urethane acrylate-based, polyester acrylate-based, and polyol acrylate-based oligomers, polymers and monofunctional, bifunctional, or polyfunctional polymerizable (meth)acrylic monomers, such as tetrahydrocarbons. Monomers and oligomers such as furfuryl acrylate, 2-hydroxyethyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, etc. , polymers and the like.

Such a reflective layer 20 is formed by, for example, a chemical vapor deposition (CVD) method, a sputtering method, or a coating method. There is no particular restriction on the method of forming the reflective layer 20, and it is necessary to select an appropriate forming method depending on the production quantity and usage pattern of the insect trapping sheet 1. For example, examples of the coating method include an offset method, a flexo method, a silk screen method, and a gravure method.

[Adhesive layer]
The adhesive layer 30 is a layer formed by applying an adhesive such as a synthetic adhesive or a natural adhesive. Examples of the synthetic adhesive include acrylic adhesive, polybutene adhesive, polyisobutylene, styrene-butadiene rubber adhesive, butyl rubber, chloroprene rubber, vinyl chloride-vinyl acetate copolymer, chlorinated rubber, polyvinyl butyral, and the like. Examples of natural adhesives include natural rubber and gelatin.

Further, the adhesive layer 30 may be prepared by mixing various conventionally known additives and attractants with the adhesive. Various additives and attractants include, for example, bactericides, fungicides, preservatives, antioxidants, ultraviolet inhibitors, spreading agents, chelating agents, thickeners, ingestion prevention agents, and fragrances (acetoin, etc.). ), fly sex pheromones (for example, (Z)-9-tricosene), or other attractants (for example, methyl phenylacetate, ethyl phenylacetate, propyl phenylacetate, phenethyl phenylacetate, etc.) can be used. . Furthermore, in order to enhance the attracting activity of insects such as flies, it is also effective to color the attractant with a dye such as red. In addition, other dietary attractants include fruits (melon, banana, strawberry, etc.) and their extracts and processed products, brewed products (black vinegar, miso, soy sauce, etc.), brewed liquors (beer, wine, sake, fruit liquor, etc.) ), distilled spirits (whiskey, shochu, vodka, etc.).

<Effects of the first embodiment>
The insect trapping sheet 1 according to the first embodiment described above has the following effects.
(1) The insect trapping sheet 1 according to this embodiment has a reflective layer 20 made of a metal material. Therefore, the insect trapping sheet 1 reduces the average transmittance of ultraviolet rays to the base material 10, and does not require measures against UV deterioration such as UV absorbers and antioxidants when molding the base material 10. deterioration can be suppressed.
(2) The insect trapping sheet 1 according to the present embodiment has a reflective layer 20 made of a metal material with low brightness. Therefore, the insect trapping sheet 1 can reduce the visibility of the trapped insects. Therefore, even if the insect-catching sheet 1 is installed in a place where it can be seen by consumers using a store, for example, it is possible to suppress the appearance of unpleasantness and unsanitary impression, thereby suppressing the decline in consumer purchasing behavior. there is a possibility.
(3) The insect trapping sheet 1 according to the present embodiment does not require measures against ultraviolet deterioration such as ultraviolet absorbers and antioxidants when molding the base material 10, and uses expensive and bright fluorescent pigments. do not have. Therefore, the insect trapping sheet 1 can be manufactured at low manufacturing cost.

2. Second Embodiment Hereinafter, the configuration of an insect trapping sheet 101 according to a second embodiment will be described using FIG. 3. FIG. 3 is a sectional view showing an example of the configuration of the insect trapping sheet 101 according to the present embodiment.

<Configuration of insect trapping sheet>
As shown in FIG. 3, the insect trapping sheet 101 according to the present embodiment includes a base material 110, a reflective layer 120 provided on one surface of the base material 110 (the lower surface of the base material 110 in FIG. 3), and a base material 110. The adhesive layer 130 is provided on the other surface of the material 110 (the upper surface of the base material 110 in FIG. 3). That is, the insect trapping sheet 101 is configured by laminating a reflective layer 120, a base material 110, and an adhesive layer 130 in this order.

In the insect trapping sheet 101, the surface on which the adhesive layer 130 is formed is irradiated with ultraviolet light, and the ultraviolet light that reaches the reflective layer 120 via the adhesive layer 130 and the base material 110 is reflected by the reflective layer 120. Ru. As a result, ultraviolet light is diffusely reflected on the side surface of the insect-trapping sheet 101 on which the adhesive layer 130 is formed, producing an insect-attracting effect, and the adhesive layer 130 can trap insects.

That is, in the insect trapping sheet 101 according to the present embodiment, the lamination order of the base material 110, the reflective layer 120, and the adhesive layer 130 is the same as that of the base material 10, the reflective layer 20, and the adhesive layer 30 of the insect trapping sheet 1 according to the first embodiment. It differs from the insect trapping sheet 1 in that the order of stacking is different.
The reflective layer 120 and the adhesive layer 130 of the insect-trapping sheet 101 according to the present embodiment are the same as the base material 10 of the insect-trapping sheet 1 according to the first embodiment, so a description thereof will be omitted.
In the insect trapping sheet 101 according to this embodiment, ultraviolet light passes through the base material 110. Therefore, unlike the base material 10 of the insect-trapping sheet 1 according to the first embodiment, the base material 110 of the insect-trapping sheet 101 must contain an ultraviolet absorber or a light stabilizer in the resin material. Other than this, it is the same as the base material 10 of the insect trapping sheet 1 according to the first embodiment.

<Effects of the second embodiment>
The insect trapping sheet 101 according to the second embodiment described above has the same effects as the first embodiment.

Hereinafter, the insect trapping sheets described in each embodiment will be explained in more detail with reference to Examples.
As shown below, three samples of insect trapping sheets were prepared, and the transmittance and reflectance of ultraviolet light in a predetermined wavelength range were measured.

[Sample 1]
A sample 1 sheet was made of a polypropylene resin highly filled with calcium carbonate. Note that Sample 1 was a single-layer sheet of a base material in which a reflective layer, an adhesive layer, or any other layer was not formed on both sides of the base material. The visual density on the sheet of sample 1 was 0.01.

[Sample 2]
A fluorescent yellow pigment ink is applied to one side of the same substrate as Sample 1 using an offset method to form a fluorescent coating, and then an acrylic adhesive is applied to the surface of the fluorescent coating to form a base material. A sample 2 sheet was formed by laminating a material, a fluorescent coating, and an adhesive layer. The visual density on the sample 2 sheet was 0.03.

[Sample 3]
After forming a reflective layer by applying aluminum flake pigment ink to one side of the same base material as in Sample 1 using an offset method, an acrylic adhesive was applied to the surface of the reflective layer to form a base material A sheet of sample 3 was formed in which a reflective layer and an adhesive layer were laminated. The visual density on the sample 3 sheet was 0.5.

The following evaluations were performed using each of the sheets Sample 1 to Sample 3 described above.

[Evaluation of spectral characteristics]
In order to evaluate the spectral characteristics of each sheet from Sample 1 to Sample 3, the average reflectance of ultraviolet light (%) was measured using a spectrophotometer (UV-Visible-Infrared Spectrophotometer UV-3600, manufactured by Shimadzu Corporation). And the average transmittance (%) of ultraviolet light from the front surface of the sheet to the back surface was measured. In the evaluation of the spectral characteristics, the average transmittance of ultraviolet light was measured using ultraviolet light in a wavelength range (290 nm or more and 340 nm or less) in which the resin material constituting the base material is likely to deteriorate. Moreover, the average reflectance of ultraviolet light was measured using ultraviolet light in a wavelength range (290 nm or more and 400 nm or less) that is effective in attracting insects.

4 and 5 show the evaluation results of the spectral characteristics of each sheet of Sample 1 to Sample 3. The graph shown in Figure 4 shows wavelength (nm) on the horizontal axis and transmittance (%) on the vertical axis, and the graph shown in Figure 5 shows wavelength (nm) on the horizontal axis and reflectance (%) on the vertical axis. show.
In FIG. 4, the graphs shown by solid lines, broken lines, and dashed-dotted lines indicate the average transmittance of ultraviolet rays in each sheet of Sample 1, Sample 2, and Sample 3. Further, in FIG. 5, the graphs indicated by solid lines, broken lines, and dashed-dotted lines indicate the average reflectance of ultraviolet rays in each sheet of Sample 1, Sample 2, and Sample 3.

[Evaluation of diffuse reflection characteristics]
In order to evaluate the reflection characteristics of each sheet of Samples 1 to 3, the diffuse reflectance (%) of ultraviolet light was measured using a color difference meter (Spectral Variation Color Meter GC5000, manufactured by Nippon Denshoku Industries Co., Ltd.). The measurement method was to enter light from the -45 degree direction and measure the reflectance (%) of the reflected light from -80 degrees to 80 degrees.
FIG. 6 shows the evaluation results of the reflection characteristics of each sheet of Samples 1 to 3. The graph shown in FIG. 6 shows the reflection angle (degrees) on the horizontal axis and the reflectance (%) on the vertical axis, and shows the reflectance at a wavelength of 400 nm.

In addition, Table 1 below shows the composition of each sample, the average transmittance in the wavelength range (300 nm or more and 320 nm or less) where polypropylene resin is prone to photodeterioration, and the ultraviolet light in the wavelength range (330 nm or more and 370 nm or less) that has a high insect attracting effect. shows the average reflectance of Further, Table 1 below shows the reflection characteristics of ultraviolet light in the wavelength range (400 nm) where the insect attracting effect is high and the visibility of captured insects in each sample. Regarding the diffusion properties, they were ranked as "A", "B", and "C" in descending order of properties.

(About the transmission of ultraviolet light)
As shown in the graph of Figure 4, the sample 1 sheet made of only the base material transmits about 2% to 4.5% of ultraviolet rays, and the wavelength range (300 nm or more and 320 nm or less) where polypropylene resin is easily photodegraded. ), it was confirmed that on average about 3% of ultraviolet rays were transmitted.
In addition, in the sheet of sample 2, which has a fluorescent coating film on the base material, slightly less than 1% of ultraviolet rays are transmitted, and in the wavelength range (300 nm to 320 nm), about 1% of ultraviolet rays are transmitted on average. This was confirmed.

On the other hand, in the sheet of Sample 3, in which a reflective film containing a metal material is provided on the base material, less than 0.3% of ultraviolet rays are transmitted, and the average transmittance of ultraviolet rays in the wavelength range (300 nm to 320 nm) is almost 0. %. This indicates that ultraviolet rays are blocked by the aluminum flake pigment contained in the reflective layer.

(Regarding reflection of ultraviolet light)
As shown in the graph of Figure 5, the sample 1 sheet made of only the base material has a small reflectance bias in the wavelength range of the ultraviolet light used for measurement, and has a high insect attracting effect (330 nm to 370 nm). Below), it was confirmed that more than 75% of the light was reflected.
In addition, the sample 2 sheet with a fluorescent coating on the base material reflected about 20% of ultraviolet light in a relatively short wavelength range and about 60% of ultraviolet light in a relatively long wavelength range. The rate was confirmed. This is thought to be due to the molecular structure and light absorption characteristics of the fluorescent yellow pigment contained in the fluorescent coating.

On the other hand, it was confirmed that the sheet of sample 3, in which a reflective layer containing a metal material was provided on the base material, had little bias in the ultraviolet region and reflected approximately 40% or more of ultraviolet rays. This is thought to be because ultraviolet light is specularly reflected on the surface of the aluminum flake pigment, making the structure less susceptible to absorption characteristics depending on wavelength.

In addition, as shown in Table 1, when comparing Sample 2 and Sample 3, Sample 3 is 7 times more sensitive to ultraviolet light in the wavelength range (300 nm or more and 320 nm or less) where polypropylene resin is easily photodegraded. It was found that the light transmittance was reduced.
Furthermore, when comparing Sample 2 and Sample 3, it was found that Sample 2 and Sample 3 have almost the same reflectance for ultraviolet light in the wavelength range (330 nm or more and 370 nm or less) that is particularly effective at attracting insects. Ta.

(About the diffusion characteristics of ultraviolet light)
As shown in the graph of Figure 6, the sample 1 sheet made only of the base material does not have a reflective layer formed by applying a coating agent or ink, so regardless of the incident light, the reflected light It was confirmed that the light was distributed evenly in almost all directions.

In addition, it was confirmed that in the sheet of sample 2 in which a fluorescent coating was provided on the base material, the specular reflection component at the interface of the fluorescent coating tended to become stronger. This is thought to be because the fluorescent yellow pigment contained in the fluorescent coating has spectral absorption characteristics due to the bonding of pigment molecules. In addition, since the pigment molecules are granular and small in shape, when a fluorescent yellow pigment ink dissolved in a solvent is applied to form a fluorescent coating, the smoothness of the fluorescent coating is high due to the leveling effect. This could also be a reason.

On the other hand, in the sheet of sample 3, in which a reflective layer containing a metal material is provided on the base material, compared to the sheet of sample 2, reflected light tends to be scattered due to metallic luster reflection from the metal material. It could be confirmed. This is considered to be because the pigment that produces the color in the reflective layer is a metal material (aluminum flake pigment) itself, and therefore has almost no spectral absorption characteristics due to the bonding of pigment molecules. In addition, the size of the pigment particles is larger than that of general pigments (e.g. fluorescent pigments), the reflection component due to metallic luster is stronger, and the leveling effect of the coating film is also lower, so the interface is smaller than that of sample 2. Another possible reason is that the smoothness of the turbulent reflective layer becomes low.

Furthermore, as shown in Table 1, it was confirmed that when the visual density was 0.35 or higher, the visibility of the caught insects was lower (the insects were less noticeable).

[Insect trapping ability and appearance evaluation]
In order to evaluate the insect-catching ability and appearance of each sheet of Sample 2 and Sample 3, an insect-catching test was conducted using a flying insect trap (Luics flying insect trap manufactured by SHIMADA Co., Ltd.). A sheet of sample 2 and a sheet of sample 3 were each set in a flying insect trap so that the adhesive layer was located on the light source side. In the insect trapping test, a flying insect trap was placed at the back entrance of the SHIMADA Co., Ltd. building (1050 Shimonakano-cho, Higashiomi City, Shiga Prefecture) for four days from October 18, 2018 to October 22, 2018, and the number of insects caught was measured. This was done by visually observing. The insect trapping test was conducted by placing a flying insect trap for a total of 89 hours in the following period A, period B, and period C.
Period A: From 17:00 on October 18, 2018 to 10:00 on October 19, 2018 (17 hours)
Period B: From 10:00 on October 19, 2018 to 17:00 on October 19, 2018 (7 hours)
Period C: From 17:00 on October 19, 2018 to 10:00 on October 22, 2018 (65 hours)

Table 2 below shows the period of the insect trapping test and the results of the number of insects caught in each period.

During the insect trapping test described above, the total number of insects captured in Sample 2 was 253. On the other hand, the total number of insects captured in Sample 3 was 391, and Sample 3, which had a reflective layer containing aluminum flake pigment, had a higher insect-catching performance than the sheet of Sample 2.

We also confirmed the appearance of the sheet when installed in a flying insect trap. In the sheet of Sample 2, the fluorescent yellow pigment in the fluorescent coating was excited by the ultraviolet illumination and emitted light in the visible light region, so it appeared to be emitting yellow light to the naked eye. For this reason, a lot of light leaked from the flying insect trap, making it relatively conspicuous. Further, as shown in FIG. 7(A), the sheet of Sample 2 had a high brightness due to the fluorescent coating, and the trapped insects were easily noticeable.

On the other hand, even when the sheet of sample 3 was illuminated with ultraviolet light, it did not emit light in the visible light range because it did not have a fluorescent component, and only a slight bluish light was visible when visually observed. For this reason, there was little light leaking from the flying insect trap, making it relatively inconspicuous. In addition, as shown in Figure 7(B), the sheet of sample 3 has a reflective layer containing aluminum flake pigment, so the brightness of the sheet is low and it looks like a dark gray color, making the trapped insects more conspicuous. It was difficult.

From the above, it was confirmed that Sample 3, which has a reflective layer containing a metal material, is an insect-trapping sheet in which the base material made of a resin material is resistant to photodeterioration and has a high insect-attracting effect. In addition, Sample 3 is an insect trap sheet that makes the captured insects less noticeable, and it was confirmed that the flying insect trap itself is less noticeable because less light leaks from the flying insect trap in which Sample 3 is installed.

Although the specific configuration of the present invention has been explained above using each embodiment, the scope of the present invention is not limited to the illustrated and described exemplary embodiments, and the scope of the present invention is not limited to the illustrated and described exemplary embodiments. It also includes all embodiments of equivalent effect. Furthermore, the scope of the invention is not limited to the combinations of inventive features defined by the claims, but may be defined by any desired combinations of specific features of each and every disclosed feature.

The insect-trapping sheet of the present invention is low in production cost, has excellent ultraviolet light deterioration inhibiting properties and insect-attracting effects, and can be particularly suitably used in ultraviolet-attracting insect traps.

1,101 Insect trapping sheet 10,110 Base material 20,120 Reflective layer 30,130 Adhesive layer

Claims (9)

A base material that does not contain pigments that impart color ;
a reflective layer containing a metal material and provided on the entire surface of at least one surface of the base material so as to be in close contact with the base material ;
an adhesive layer provided on the surface of the reflective layer opposite to the base material;
Equipped with
The reflective layer has an average reflectance of 45% or more for ultraviolet light having a wavelength of 330 nm or more and 370 nm or less, and an average transmittance of 0.7% or less for ultraviolet light having a wavelength of 290 nm or more and 330 nm or less. Insect trap sheet. A base material formed of a resin material that contains an ultraviolet absorber or a light stabilizer and does not contain a pigment that imparts color ;
a reflective layer containing a metal material and provided on the entire surface of one surface of the base material so as to be in close contact with the base material ;
an adhesive layer provided on the other surface of the base material;
Equipped with
The reflective layer has an average reflectance of 45% or more for ultraviolet light having a wavelength of 330 nm or more and 370 nm or less, and an average transmittance of 0.7% or less for ultraviolet light having a wavelength of 290 nm or more and 330 nm or less. Insect trap sheet. The insect-trapping sheet according to claim 1 or 2, wherein the metal material is a metal powder with an average particle size of 1 μm or more and 40 μm or less. The insect-trapping sheet according to any one of claims 1 to 3, wherein the reflective layer has a visual density of 0.35 or more. The insect-trapping sheet according to any one of claims 1 to 4, wherein the reflective layer has a thickness of 0.5 μm or more and 25 μm or less. The insect-trapping sheet according to any one of claims 1 to 5, wherein the metal material has a flake shape. The insect-trapping sheet according to claim 6, wherein the metal material is a non-leafing type aluminum flake pigment. The metal material is spherical.
Insect trapping sheet according to any one of claims 1 to 5.. The insect-trapping sheet according to any one of claims 1 to 8 , wherein the base material has an uneven shape formed on a surface facing the reflective layer.

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