JP2020130023A - Insect trapping sheet - Google Patents

Abstract

To obtain an insect trapping sheet that is superior in the ultra-violet light deterioration suppression property, and is hard to visually confirm the trapped insect.SOLUTION: An insect trapping sheet includes a base material, a reflective layer provided in at least one surface of the base material and containing metal materials, and an adhesive layer provided at the surface opposite to the base material of the reflective layer. Preferably, the reflective layer may be configured such that the average reflectivity to the ultra-violet light having the wavelength in a range of 330 nm or more and 370 nm or less is 45% or more, and the average transmission to the ultra-violet light having the wavelength in a range of 290 nm or more and 330 nm or less is 0.7% or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to an insect trap sheet.

Conventionally, an insect trap that has a light source that emits ultraviolet light and an adhesive sheet for catching insects, attracts insects by ultraviolet light, and catches the insects with the adhesive sheet has been used. Such an insect trap includes a base sheet, a coating film containing a fluorescent pigment having a yellowish color tone 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). The adhesive for catching insects is irradiated with a large amount of ultraviolet rays when attracting insects, and the insects attracted by the ultraviolet rays reflected by the fluorescent pigment are captured by the adhesive layer.

Japanese Unexamined Patent Publication No. 8-51909

As the fluorescent pigment contained in the coating film of the pressure-sensitive adhesive sheet, an organic pigment is generally used from the viewpoint of cost and manufacturing method. Fluorescent organic pigments have a small particle size and low ultraviolet shielding properties. Therefore, the plastic sheet used as the base material of the adhesive sheet may become brittle due to ultraviolet rays.
Further, the pressure-sensitive adhesive sheet on which the coating film containing the fluorescent pigment is formed has a high brightness such as a yellowish color tone, and the insects trapped in the pressure-sensitive adhesive sheet can be easily seen. For this reason, discomfort may occur when the adhesive sheet is replaced.

The present invention has been proposed in view of such a problem, and an object of the present invention is to provide an insect trapping sheet which is excellent in suppressing deterioration due to ultraviolet light and whose trapped insects are hard to see.

The insect repellent sheet according to one aspect of the present invention is provided on at least one surface of the base material and the base material, a reflective layer containing a metal material, and an adhesive layer provided on the surface of the reflective layer opposite to the base material. It is characterized by having.

The insect repellent sheet according to another aspect of the present invention includes a base material formed of a resin material containing an ultraviolet absorber or a light stabilizer, a reflective layer provided on one surface of the base material and containing a metal material, and a base material. It is characterized by comprising an adhesive layer provided on the other surface of the above.

According to the present invention, it is possible to provide an insect trapping sheet which is excellent in suppressing deterioration due to ultraviolet light and in which the captured insects are hard to see.

It is sectional drawing which shows one structural example of the insect trap sheet which concerns on 1st Embodiment of this invention. It is sectional drawing which shows one structural example of the reflection layer of the insect trap sheet which concerns on 1st Embodiment of this invention, and the state of light scattering. It is sectional drawing which shows one structural example of the insect trap sheet which concerns on 2nd Embodiment of this invention. It is a graph which shows the average transmittance of ultraviolet light in each sheet of Sample 1 to Sample 3 in an Example. It is a graph which shows the average reflectance of ultraviolet light in each sheet of Sample 1 to Sample 3 in an Example. It is a graph which shows the diffuse reflectance of ultraviolet light in each sheet of Sample 1 to Sample 3 in an Example. It is a photograph which shows the appearance of the insect catching sheet in each sheet of Sample 2 and Sample 3 after the insect catching test.

Hereinafter, embodiments of the present invention will be described 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 includes the following materials, shapes, structures, etc. of components. It is not specified in. The technical idea of the present invention can be modified in various ways within the technical scope specified by the claims stated in the claims.

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

<Composition of insect trap sheet>
As shown in FIG. 1, the insect trapping sheet 1 is provided on the base material 10, the reflective layer 20 provided on at least one surface of the base material 10, and the surface of the reflective layer 20 opposite to the base material 10. The adhesive layer 30 is provided.
In addition, 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 structure in which reflective layers 20 are provided on both sides of the base material 10 and adhesive layers 30 are provided on the respective surfaces of the reflective layers 20, that is, the adhesive layer 30 and 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, the surface on the side where the adhesive layer 30 is formed (hereinafter, may be referred to as the surface of the insect trapping sheet 1) is irradiated with ultraviolet light and reaches the reflective layer 20 via the adhesive layer 30. The ultraviolet light is reflected by the reflection layer 20. As a result, ultraviolet light is diffusely reflected on the surface of the insect trapping sheet 1 to generate an insect attracting effect, and the adhesive layer 30 can capture the insects.

The base material 10 is a layer that serves as a base material for the insect trapping sheet that supports the reflective layer 20 and the adhesive layer 30.
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 emitted from a light source. Further, the reflective layer 20 also functions as a layer that suppresses the transmission of ultraviolet light emitted from the light source to the base material 10 and suppresses deterioration of the base material 10.
The adhesive layer 30 is a layer for catching insects. The adhesive layer 30 also functions as a layer that protects the reflective layer 20.
Hereinafter, each of the above-mentioned layers will be described in detail.

[Base material]
The base material 10 is, for example, a resin sheet formed of a resin material. The type of the resin material forming the base material 10 is not particularly limited as long as the rigidity of the base material supporting the reflective layer 20 and the adhesive layer 30 is not impaired. The base material 10 is, for example, a polyolefin resin such as polyethylene resin or polypropylene resin, a polyester resin such as polybutylene terephthalate resin or polyethylene terephthalate resin, a resin material such as polystyrene resin or vinyl chloride resin, or a resin film formed of a mixture thereof. Alternatively, a resin sheet may be mentioned. Further, 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 the vertical or horizontal uniaxial direction or 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 antiblocking agent and the like. Further, the base material 10 may be made of a material other than the 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, and 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 that the base material 10 has durability against ultraviolet rays and appropriate rigidity. Further, when the thickness of the base material 10 is 300 μm or less, the base material 10 is preferable because it has appropriate flexibility.

The base material 10 may be subjected to a corona discharge treatment method, a chromium acid oxidation treatment (wet type), a flame treatment, a hot air treatment, an ozone / plasma irradiation treatment, an easy adhesion treatment, or the like on the surface facing the reflective layer 20.
By performing these treatments, the surface of the base material 10 facing the reflective layer 20 improves the wettability of the coating agent containing the metal material when the reflective layer 20 is formed, and the adhesion of the reflective layer 20 to the base material 10 is improved. Is improved.
These surface treatment methods are appropriately selected according to the type of the base material 10, but the corona discharge treatment method is preferably used from the viewpoints 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 substrate 10 may be improved by forming an anchor layer or a primer layer on the surface of the substrate 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 the method for forming the uneven shape on the base material include a sandblasting method and a solvent treatment method. Further, a base material in which irregularities due to the additive are formed by adding an additive such as calcium carbonate to the resin material to form a film and then stretching the resin material may be used.
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, the diffuse reflection performance of the reflective layer 20 can be improved, and the range in which the insect attracting effect is produced can be expanded. It will be possible.

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

The shorter the wavelength, the greater the energy of light, and the photodegradation of the resin material is caused by ultraviolet rays having a shorter wavelength. Since light having a wavelength shorter than 290 nm is absorbed by the ozone layer, photodegradation of the resin material is caused by ultraviolet rays of 290 nm or more and 400 nm or less. The wavelength range of ultraviolet rays that deteriorates the resin material differs depending on the type of the resin material.
The maximum wavelengths of ultraviolet rays that deteriorate 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 or more and 364 nm or less, polyoxymethylene. 300 nm or more and 320 nm or less, polycarbonate 295 nm, nitrocellulose 310 nm, polymethylmethacrylate 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 realize the average reflectance and the average transmittance for such 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 to each other and a residue of the solvent used when forming the reflective layer, depending on the layer forming method, and the metal material is a resin. It may be mixed with the material.
The metal material contained in the reflective layer 20 has a function of reflecting ultraviolet rays from a light source to generate an insect attracting effect and suppressing transmission of ultraviolet rays to the base material 10. The metal material is not particularly limited as long as it is a material that reflects ultraviolet light, but it is preferable to use aluminum (Al), silver (Ag), copper-zinc alloy (brass, brass), etc., which is inexpensive and resistant to ultraviolet rays. It is more preferable that aluminum (Al) is used in terms of high value.

The shape of the metal material may be any shape as long as it can reflect ultraviolet light, for example, granular or flaky. The shape of the metal material is preferably spherical, which has a higher diffused reflection effect of light, from the viewpoint of enhancing the insect attracting effect. 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 capable of forming the reflective layer 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 the light can be diffusely reflected to enhance the insect attracting effect.

Generally, the flake-shaped aluminum material (hereinafter referred to as aluminum flake pigment) includes a leafing type and a non-leafing type, but it is preferable to use a non-leaving type aluminum flake pigment from the viewpoint of insect attracting effect. Since the leafing type aluminum flake pigment has a low surface tension, it has a low affinity with the solvent and binder contained in the paint, floats on the surface layer side of the coating film and is oriented almost uniformly, and easily totally reflects ultraviolet rays. On the other hand, the non-leafing type aluminum flake pigment has a high affinity with the solvent and the binder contained in the paint because the surface tension is not so small. 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 made of steel such as steel balls and use a grinding device such as a ball mill with a spherical grinding medium, using saturated fatty acids such as stearic acid as a grinding aid, mineral spirit, solvent naphtha, etc. It is obtained by wet-grinding an aluminum powder in the organic solvent of. Further, the non-leafing type aluminum flake pigment can be obtained by the same grinding using an unsaturated fatty acid such as oleic acid as a pulverizing aid instead of the saturated fatty acid described above.

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 it is excellent in the effect of reflecting ultraviolet rays and suppressing transmission to the base material 10. Further, when the average particle size of the metal material is 40 μm or less, it is preferable because the reflective layer 20 of the metal material is excellent in coatability when formed by a coating method (details will be described later).
Here, in the present embodiment, the average particle size means a mode diameter (re-frequency particle size).
When the metal material has a flake shape, the average particle size (mode diameter) means the average length of the major axis portion among the major axis, the minor axis, and the thickness.

The reflective layer 20 preferably has a visual density of 0.35 or more. As a result, the reflective layer 20 improves the average reflectance of ultraviolet rays to enhance the insect attracting effect, and lowers the average transmittance of ultraviolet rays to the base material 10 to suppress deterioration of the base material 10. Further, 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 coating 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 of the metal material, improve the insect attracting effect, suppress the deterioration of the base material 10, and reduce the visibility of the captured insects. it can.
Further, by setting the film thickness of the metal material to 25 μm or less, the thickness of the reflective layer 20 can be made thin. As a result, the reflective layer 20 is formed with high flexibility, and damage to the reflective layer 20 (cracks and peeling of the metal material) is less likely to occur, and the amount of the metal material used can be suppressed to reduce the manufacturing cost. it can.

The film thickness of the reflective layer 20 varies depending on the amount of the coating agent added (concentration) of the coating agent containing the metal material and the particle size of the metal material. Therefore, in addition to the film thickness control index, the visual density of the metal material can be used as an index. The visual density of the metallic material is preferably 0.35 or more. When the visual concentration is 0.35 or more, the coverage of the base material 10 with the metal material can be improved to improve the insect attracting effect, and the deterioration of the base material 10 can be suppressed and the visibility of the captured insects can be improved. It can be reduced.
For example, when the reflective layer 20 is formed by an offset printing method using a coating agent containing a flake-shaped metal material, the amount of the metal material added to the coating agent is 20% by weight, and the average particle size of the metal material (mode). When the diameter) is 6 μm and the coating agent 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 a metal shape with a binder. In this case, the binder may be a general material, for example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-propylene-diene rubber (EPDM), styrene butadiene rubber (SBR), nitrile. It is preferable to use a chemically and physically stable material such as butadiene rubber (NBR) and fluororubber. Since the adhesive layer 30 has excellent resistance to ultraviolet light and has a high effect of protecting the reflective layer 20, the binder is not necessarily limited to a material having 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 a thermosetting resin and an ultraviolet curable resin. Epoxy resin is generally used as the thermosetting resin, but it is not particularly limited as long as it is liquid at room temperature, and examples thereof include phenol resin, melamine resin, unsaturated polyester, polyimide bismalade triazine resin, and polysizaran. be able to. Examples of the ultraviolet curable resin include epoxy acrylate-based, urethane acrylate-based, polyester acrylate-based, and polyol acrylate-based oligomers, and polymers and monofunctional, bifunctional, or polyfunctional polymerizable (meth) acrylic monomers, such as tetrahydro. Monomers and oligomers such as furfuryl acrylate, 2-hydroxyethyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylpropantriacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate , 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. The method of forming the reflective layer 20 is not particularly limited, and it is necessary to select an appropriate forming method depending on the production quantity and usage pattern of the insect trap sheet 1. For example, examples of the coating method include an offset method, a flexographic method, a silk screen method, and a gravure method.

[Adhesive layer]
The pressure-sensitive adhesive layer 30 is a layer formed by applying a pressure-sensitive adhesive such as a synthetic pressure-sensitive adhesive or a natural pressure-sensitive adhesive. Examples of the synthetic pressure-sensitive adhesive include acrylic pressure-sensitive adhesives, polybutene-based pressure-sensitive adhesives, polyisobutylene, styrene-butadiene rubber pressure-sensitive adhesives, butyl rubber, chlorobrene rubber, polyvinyl chloride-vinegar copolymers, rubber chloride, and polyvinyl butyral. Examples of the natural adhesive include natural rubber, gelatin and the like.

Further, the pressure-sensitive adhesive layer 30 may be mixed with various conventionally known additives and attractants. Examples of various additives and attractants include bactericides, mold killing agents, preservatives, antioxidants, ultraviolet inhibitors, spreading agents, chelating agents, thickeners, anti-accidental agents, and fragrances (acetin, etc.) ), Sex pheromones of flies (eg, (Z) -9-tricosene), or other attractants (eg, methyl phenylacetate, ethyl phenylacetate, propyl phenylacetate, phenethyl phenylacetate, etc.) and the like can be used. .. Further, in order to enhance the attracting activity of insects such as flies, it is also effective to color the attracting agent to a red color or the like with a dye. In addition, as other food attractants, fruits (melon, banana, strawberry, etc.) and their extracts and processed products, brewed products (black vinegar, miso, shochu, etc.), brewed liquor (beer, wine, sake, fruit liquor, etc.) ), Distilled sake (whiskey, shochu, vodka, etc.) ”is known.

<Effect 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 the present embodiment has a reflective layer 20 made of a metal material. Therefore, the insect trapping sheet 1 lowers the average transmittance of ultraviolet rays to the base material 10, and does not require measures against ultraviolet deterioration such as an ultraviolet absorber and an antioxidant 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 having 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 consumers who use the store can see it, it is possible to suppress giving an unpleasant appearance or an unsanitary impression and suppress the attenuation of the consumer's 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 an ultraviolet absorber and an antioxidant when molding the base material 10, and uses an expensive and highly bright fluorescent pigment. Absent. Therefore, the insect trap sheet 1 can be manufactured at a low manufacturing cost.

2. 2. Second Embodiment Hereinafter, the configuration of the insect catching sheet 101 according to the second embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a configuration example of the insect trap sheet 101 according to the present embodiment.

<Composition of insect trap 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 (lower surface of the base material 110 in FIG. 3), and a base. It includes an adhesive layer 130 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 the reflective layer 120, the base material 110, and the adhesive layer 130 in this order.

In the insect trapping sheet 101, the surface on the side where 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 adhesive layer 130 forming of the insect trapping sheet 101 to generate an insect attracting effect, and the adhesive layer 130 can capture insects.

That is, in the insect trapping sheet 101 according to the present embodiment, the stacking 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 trap sheet 1 in that it differs from the stacking order.
Since 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, the description thereof will be omitted.
In the insect trapping sheet 101 according to the present embodiment, ultraviolet light passes through the base material 110. Therefore, unlike the base material 10 of the insect catching sheet 1 according to the first embodiment, the base material 110 of the insect catching sheet 101 is required to contain an ultraviolet absorber or a light stabilizer with respect to the resin material. Other than this, it is the same as the base material 10 of the insect trap sheet 1 according to the first embodiment.

<Effect of the second embodiment>
The insect catching sheet 101 according to the second embodiment described above has the same effect as that of the first embodiment.

Hereinafter, the insect trapping sheet described in each embodiment will be described in more detail by way of examples.
As shown below, samples of three insect trapping sheets were prepared, and the transmittance and reflectance of ultraviolet light in a predetermined wavelength region were measured.

[Sample 1]
A base material made of polypropylene resin highly filled with calcium carbonate was used as a sheet of Sample 1. Sample 1 was a single-layer sheet of a base material on which no reflective layer, adhesive layer, or other layers were formed on both sides of the base material. The visual density in the sheet of sample 1 was 0.01.

[Sample 2]
A fluorescent yellow pigment ink is applied to one surface of the same base material as in Sample 1 by an offset method to form a fluorescent coating film, and then an acrylic pressure-sensitive adhesive is applied to the surface of the fluorescent coating film to form a base. A sheet of sample 2 in which the material, the fluorescent coating film and the adhesive layer were laminated was formed. The visual density in the sheet of sample 2 was 0.03.

[Sample 3]
Aluminum flake pigment ink is applied to one surface of the base material similar to sample 1 by an offset method to form a reflective layer, and then an acrylic pressure-sensitive adhesive is applied to the surface of the reflective layer to form the base material. A sheet of sample 3 in which a reflective layer and an adhesive layer were laminated was formed. The visual density in the sheet of sample 3 was 0.5.

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

[Evaluation of spectral characteristics]
In order to evaluate the spectral characteristics of each sheet of Samples 1 to 3, an average reflectance (%) of ultraviolet light was used using a spectrophotometer (UV-3600, ultraviolet / visible / infrared spectrophotometer manufactured by Shimadzu Corporation). The average transmittance (%) of ultraviolet light from the front surface to the back surface of the sheet 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. The average reflectance of ultraviolet light was measured using ultraviolet light in a wavelength range (290 nm or more and 400 nm or less) effective for attracting insects.

4 and 5 show the evaluation results of the spectral characteristics of each sheet of Samples 1 to 3. The graph shown in FIG. 4 shows the wavelength (nm) on the horizontal axis and the transmittance (%) on the vertical axis, and the graph shown in FIG. 5 shows the wavelength (nm) on the horizontal axis and the reflectance (%) on the vertical axis. Shown.
In FIG. 4, the graphs shown by solid lines, broken lines, and alternate long and short dash lines show the average transmittance of ultraviolet rays in each sheet of Sample 1, Sample 2, and Sample 3. Further, in FIG. 5, the graphs shown by solid lines, broken lines, and alternate long and short dash lines show 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 of the sheets of Samples 1 to 3, the diffuse reflectance (%) of ultraviolet light was measured using a color difference meter (spectral variable angle color difference meter GC5000 manufactured by Nippon Denshoku Kogyo Co., Ltd.). As a measuring method, light was incident from the direction of −45 degrees, and the reflectance (%) of the reflected light in the direction of −80 degrees to 80 degrees was measured.
FIG. 6 shows the evaluation results of the reflection characteristics of each sheet of Samples 1 to 3. In the graph shown in FIG. 6, the reflection angle (degrees) is shown on the horizontal axis, the reflectance (%) is shown on the vertical axis, and the reflectance at a wavelength of 400 nm is shown.

In addition, Table 1 below shows the composition of each sample, the average transmittance in the wavelength region where polypropylene resin is prone to photodegradation (300 nm or more and 320 nm or less), and the ultraviolet light in the wavelength region (330 nm or more and 370 nm or less) where the insect attracting effect is high. Shows the average reflectance of. In addition, Table 1 below shows the reflection characteristics of ultraviolet light and the visibility of captured insects in the wavelength region (400 nm) where the insect attracting effect is high in each sample. The diffusion characteristics were designated as "A", "B", and "C" in descending order of characteristics.

(About the transmission of ultraviolet light)
As shown in the graph of FIG. 4, in the sheet of sample 1 composed of only the base material, about 2% to 4.5% of ultraviolet rays are transmitted, and the polypropylene resin is easily photodegraded in the wavelength region (300 nm or more and 320 nm or less). ), It was confirmed that about 3% of ultraviolet rays were transmitted on average.
Further, in the sheet of Sample 2 in which the fluorescent coating film is provided on the base material, about 1% of ultraviolet rays are transmitted, and in the wavelength region (300 nm or more and 320 nm or less), about 1% of ultraviolet rays are transmitted on average. I was able to confirm that.

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

(About the reflection of ultraviolet light)
As shown in the graph of FIG. 5, in the sheet of sample 1 composed of only the base material, the reflectance is less biased in the wavelength region of the ultraviolet light used for the measurement, and the wavelength region (330 nm or more and 370 nm) having a high insect attracting effect In the following), it was confirmed that 75% or more was reflected.
Further, in the sheet of Sample 2 in which the fluorescent coating film is provided on the substrate, about 20% of ultraviolet light in a wavelength region having a relatively short wavelength is reflected, and about 60% is reflected in ultraviolet light in a wavelength region having a relatively long wavelength. I was able to confirm the rate. It is considered that this is due to the molecular structure and light absorption characteristics of the fluorescent yellow pigment contained in the fluorescent coating film.

On the other hand, it was confirmed that the sheet of Sample 3 in which the reflective layer containing a metal material was provided on the base material had little bias in the ultraviolet region and reflected about 40% or more of ultraviolet rays. It is considered that this is because the ultraviolet light is specularly reflected on the surface of the aluminum flake pigment, so that the structure is not easily affected by the absorption characteristics depending on the wavelength.

Further, as shown in Table 1, when the sample 2 and the sample 3 are compared, the sample 3 is about 7 times more ultraviolet than the ultraviolet light in the wavelength region (300 nm or more and 320 nm or less) in which the polypropylene resin is easily photodegraded. It was found that the light transmittance could be reduced.
Further, when the sample 2 and the sample 3 are compared, it is found that the reflectances of the sample 2 and the sample 3 are almost the same with respect to the ultraviolet light in the wavelength region (330 nm or more and 370 nm or less) in which the insect attracting effect is particularly high. It was.

(Diffusion characteristics of ultraviolet light)
As shown in the graph of FIG. 6, in the sheet of sample 1 composed of only the base material, the reflective layer formed by applying the coating agent or ink is not formed, so that the reflected light is reflected regardless of the incident light. It was confirmed that the ink is evenly diffused in almost all directions.

Further, it was confirmed that the sheet of Sample 2 in which the fluorescent coating film was provided on the substrate showed a tendency for the specular reflection component at the interface of the fluorescent coating film to become stronger. It is considered that this is because the fluorescent yellow pigment contained in the fluorescent coating film has a spectral absorption characteristic due to the binding of pigment molecules. Further, since the pigment molecules are granular and have a small shape, when a fluorescent yellow pigment ink formed by dissolving in a solvent is applied to form a fluorescent coating film, the smoothness of the fluorescent coating film is high due to the leveling effect. It is also possible that this is the reason.

On the other hand, the sheet of sample 3 in which the reflective layer containing the metal material is provided on the base material shows a tendency that the reflected light is scattered due to the metallic luster reflection by the metal material as compared with the sheet of sample 2. It could be confirmed. It is considered that this is because the pigment that gives off color in the reflective layer is the metal material (aluminum flake pigment) itself, so that there is almost no spectral absorption characteristic due to the binding of the pigment molecules. In addition, the size of the pigment particles is larger than that of a general pigment (for example, a fluorescent pigment), the reflective component due to metallic luster is strengthened, and the leveling effect of the coating film is also reduced. Therefore, the interface is larger than that of sample 2. Another possible reason is that the smoothness of the turbulent reflection layer is low.

Further, as shown in Table 1, it was confirmed that when the visual density was 0.35 or more, the visibility of the captured insects was low (the insects were inconspicuous).

[Insect catching and appearance evaluation]
In order to evaluate the insect trapping property and appearance of each sheet of Sample 2 and Sample 3, a flying insect trap test was performed using a flying insect trap (Flying insect trap Lux, manufactured by SHIMADA Co., Ltd.). The sheet of sample 2 and the sheet of sample 3 were set in the flying insect trap so that the adhesive layer was located on the light source side. In the insect catching test, a flying insect catcher was placed at the back entrance of SHIMADA Co., Ltd. (1050 Shimonakano-cho, Higashiomi City, Shiga Prefecture) for 4 days from October 18th to 22nd, 2018, and the number of insects caught. Was visually observed. The insect trap test was carried out by arranging the flying insect traps for a total of 89 hours in the following periods A, B and 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 results of the insect catching test period and the number of catches in each period.

During the above-mentioned insect trapping test period, the total number of sample 2 captured was 253. On the other hand, the total number of samples captured was 391, and the sample 3 provided with the reflective layer containing the aluminum flake pigment had higher insect trapping performance than the sheet of the sample 2.

We also confirmed the appearance of the sheet when it was installed in the flying insect trap. The sheet of Sample 2 appeared to emit yellow light visually because the fluorescent yellow pigment in the fluorescent coating film was excited by ultraviolet illumination and emitted light in the visible light region. For this reason, a lot of light leaked from the flying insect trap, and it was relatively noticeable. Further, as shown in FIG. 7A, in the sheet of sample 2, the brightness of the sheet was high due to the fluorescent coating film, and the insects caught were easily noticeable.

On the other hand, the sheet of Sample 3 did not emit light in the visible light region because it did not have a fluorescent component even when illuminated by ultraviolet light illumination, and only a slightly bluish light was visually observed. For this reason, the light leaking from the flying insect trap was small and relatively inconspicuous. Further, as shown in FIG. 7B, since the sheet of sample 3 has a reflective layer containing an aluminum flake pigment, the sheet looks low in brightness and looks like dark gray, and the trapped insects are conspicuous. It was difficult.

From the above, it was confirmed that the sample 3 having the reflective layer containing the metal material is an insect trapping sheet in which the base material made of the resin material is not easily photodegraded and has a high insect attracting effect. Further, it was confirmed that the flying insect trap itself is inconspicuous because the sample 3 is an insect trap sheet in which the captured insects are inconspicuous and the light leaking from the flying insect trap in which the sample 3 is installed is small.

Although the specific configuration of the present invention has been described above with respect to each embodiment, the scope of the present invention is not limited to the illustrated and described exemplary embodiments, and the present invention is intended. It also includes all embodiments that provide equal effect. Furthermore, the scope of the present invention is not limited to the combination of the features of the invention defined by the claims, but may be defined by any desired combination of the specific features of all the disclosed features.

The insect trap sheet of the present invention has a low manufacturing cost, is excellent in ultraviolet light deterioration inhibitory property and insect attracting effect, and can be particularly suitably used for an ultraviolet light attracting type insect trap.

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

Claims (8)

With the base material
A reflective layer provided on at least one surface of the substrate and containing a metallic material,
An adhesive layer provided on the surface of the reflective layer opposite to the base material,
Insect catching sheet with. A substrate made of a resin material containing an ultraviolet absorber or a light stabilizer,
A reflective layer provided on one surface of the base material and containing a metal material,
An adhesive layer provided on the other surface of the base material and
Insect catching sheet with. The reflective layer has an average reflectance of 45% or more for ultraviolet light in the 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 the wavelength range of 290 nm or more and 330 nm or less. The insect catching sheet according to claim 1 or 2. The insect trapping sheet according to any one of claims 1 to 3, wherein the metal material is a metal powder having an average particle diameter of 1 μm or more and 40 μm or less. The insect trapping sheet according to any one of claims 1 to 4, wherein the visual density of the reflective layer is 0.35 or more. The insect trapping sheet according to any one of claims 1 to 5, wherein the thickness of the reflective layer is 0.5 μm or more and 25 μm or less. The insect catching sheet according to any one of claims 1 to 6, wherein the metal material has a flake shape. The insect trapping sheet according to any one of claims 1 to 7, wherein the base material has an uneven shape formed on the surface facing the reflective layer.