JP6671845B2 - Droplet detection sheet - Google Patents

Description

  The present invention relates to a droplet detection sheet that irreversibly develops color when a droplet containing moisture contacts.

2. Description of the Related Art Conventionally, various droplet detection sheets that develop color when wet with water have been proposed. For example, there is a writing brush paper which is white under normal conditions, but when wet with water, the refractive index of the wetted portion changes and the underlying color can be seen through. However, due to the reversibility, when the attached water evaporates, the color disappears, and there is a problem in storage stability. On the other hand, Patent Literature 1 discloses a method for analyzing the state of scattering of a medicine using water-sensitive paper, which is yellow in a normal state, but a wet portion turns blue when wet with water. However, although there are descriptions such as "chemically reactive paper reacting to the adhesion of sprayed chemicals" and "chemically sensitive paper discolored due to chemical adhesion", the composition of chemical reactive paper and water sensitive paper was included. There is no detailed description, and no details of the technical contents relating to the chemical reaction paper or the water-sensitive paper are disclosed.
In addition, Non-Patent Document 1 describes an instruction manual for water-sensitive paper test paper, Non-Patent Document 2 introduces an introduction of water-sensitive paper, and Non-Patent Document 3 relates to the state of pesticide scattering using water-sensitive paper. Although a verification report is described, details of the technical content of the water-sensitive paper test paper and water-sensitive paper are not disclosed.

JP 2007-303831A

Spraying Systems Japan Co., Ltd. Water Sensitive Test Paper Instruction Manual Internet Information <URL: http://www.spray.co.jp/products/kansuishi01.html> Nozzle Network Co., Ltd. Information on water-sensitive paper Internet information <URL: http://www.nozzle-network.co.jp/drift/kansuishi.html> Drift-prevention water-sensitive paper analysis technology [Information exchange meeting on testing and demonstration of measures to reduce pesticide scattering] Internet information <URL: http://www.maff.go.jp/kinki/syouhi/anzen/posi/pdf/190301_04 .pdf # search = '% E6% 84% 9F% E6% B0% B4% E7% B4% 99'>

  In view of the above circumstances, the present invention can easily confirm the history of contact with rain, dew condensation water, droplets containing sprayed water, and the like, and also spray or spray various kinds of chemicals containing water such as pesticides. It is an object of the present invention to provide a droplet detection sheet that allows the user to easily visually confirm and judge the state of droplet scattering and store the evidence as evidence.

The present invention achieves the above object by providing the following [1] to [6] .
[1] A droplet detection sheet having a sheet-like base material and a coating layer provided on the surface of the base material and capable of irreversible coloring, wherein the coating layer contains a liquid containing water. It contains a water-soluble dye that irreversibly develops color when contacted with a droplet and a water-soluble and / or water-absorbing adhesive (excluding polyvinyl alcohol), and the adhesive further has a property of dissolving in a solvent other than an aqueous solvent. The particle size of the water-soluble dye contained in the coating layer is such that a sieve residue having a nominal opening of 106 μm according to a sieving test method specified in JIS K0069-1992 is 0.1% or less, and A droplet detection sheet , wherein a sieve residue having a mesh size of 45 μm is in a range of 95% or more, and the water-soluble dye is dispersed and held in the adhesive and the solvent .
[2] The droplet detection sheet according to [1], wherein the base material is white or light-colored, and the coated layer after coloring is a dark-colored system.
[3] The compounding ratio of the water-soluble dye and the adhesive contained in the coating layer is water-soluble dye: adhesive = 1: 99 to 70:30 (parts by weight of solid content). The droplet detection sheet according to [1] or [2], which is a feature.
[4] The droplet detection sheet according to any one of [1] to [3] , wherein the coating layer has a thickness of 0.3 to 3.0 g / m ² .
[5] The droplet detection sheet according to any one of [1] to [4] , wherein a peelable protective film is laminated on the coating layer.
[6] The pressure-sensitive adhesive layer on a surface of said substrate opposite provided a coating layer provided a surface, wherein the release sheet material to the pressure-sensitive adhesive layer is are stacked [1 ] The droplet detection sheet according to any one of [5] to [5] .

According to the present invention, it is possible to easily confirm the history of contact with rain, dew condensation water, droplets containing sprayed water, etc., and also to observe the state of droplets scattering when spraying or spraying various chemicals containing water such as pesticides. It is possible to provide a droplet detection sheet that can be easily confirmed and judged visually and that can be stored as evidence. Further, the method for detecting a droplet using the droplet detection sheet of the present invention is an inexpensive and simple method as compared with the conventional method using a reagent that changes color when wet with water or a complicated analyzer. .
In addition, since the droplet detection sheet of the present invention has extremely good sensitivity, it is colored by moisture such as sweat attached to the hand or dew in the measurement environment. It is desirable to handle. Handling can be facilitated by laminating a protective film on the surface of the droplet detection sheet of the present invention. In addition, it can be fixed to various places such as vertical surface and ceiling surface at the time of measurement, and the object to be fixed can be fixed outdoors to buildings such as fences, fences, outer walls, rocks, trees, branches and leaves, etc. The workability is remarkably simplified by the droplet detection sheet of the present invention in which an adhesive is laminated on the back surface so as not to scatter.

It is a schematic structure figure showing an example of an embodiment of a droplet detection sheet concerning the present invention. It is a schematic structure figure showing the form example which laminated the protective film which has removability on the surface in the droplet detection sheet concerning the present invention. FIG. 3 is a schematic configuration diagram showing an example of a mode in which an adhesive layer is provided on a surface of a base material opposite to a surface on which a coating layer is provided on the droplet detection sheet according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 1, the droplet detection sheet of the present invention has a droplet having a sheet-like substrate 1 and a coating layer 2 provided on the surface of the substrate 1 and capable of irreversible coloring. A detection sheet, characterized in that the coating layer 2 contains a water-soluble dye which develops a color when it comes into contact with a droplet containing water and a water-soluble and / or water-absorbing adhesive. It is preferable that the base material is white or light-colored, and the coated layer after coloring is a dark-colored one.
The droplet detection sheet of the present invention can increase relatively large droplets (water droplets) such as rain and dew condensation water, and relatively fine droplets (water droplets containing chemical components such as chemicals) such as a medicine sprayed by a spray. This is a sheet suitable for detection with sensitivity. In the droplet detection sheet of the present invention, the water-soluble dye in the coating layer is instantaneously dissolved by contact with the droplet, and color is formed at a spot corresponding to the size of the droplet. Therefore, not only the presence / absence of the droplet can be detected, but also the diffusion state of the droplet can be confirmed based on the density and size of the generated spot.
In addition, by using a water-soluble dye that irreversibly develops, the developed spot does not discolor or discolor even if moisture evaporates, and can be visually confirmed and judged, and can be stored as evidence. . For this reason, the droplet detection sheet of the present invention is a liquid capable of visually confirming and judging the contact history with rain, dew condensation water, spray water and the like, and the state of droplet scattering at the time of spraying or spraying various chemicals containing water such as agricultural chemicals. It can be suitably used as a drop detection sheet.

  In the present invention, as a water-soluble dye of a coating layer which irreversibly develops a color when a droplet containing water contacts, a general water-soluble dye such as black, red, green or indigo is used. By using a dark-colored water-soluble dye, it is possible to easily visually recognize a spot-like coloring state.

  The particle size of the water-soluble dye is 0.1% or less for a sieve residue having a nominal opening of 106 μm according to a sieving test method specified in JIS K0069-1992 and 95% for a sieve residue having a nominal opening of 45 μm. % Is preferable.

  When the particle diameter passes through a sieve having a nominal mesh size of 45 μm, the coloring ability becomes large, and the difference in contrast between the ground color and the color when wet becomes small. On the other hand, when the particle size does not pass through a sieve having a nominal opening of 106 μm, the contrast difference between the ground color and the color when wet becomes good, but the surface is roughened, and problems such as streaks occur in the coating process. Absent.

  In the present invention, the adhesive contained in the coating layer containing a water-soluble dye that irreversibly develops color when a droplet containing water contacts, has water-soluble and / or water-absorbing properties, and ethanol, methanol There is no particular limitation as long as it can be dissolved in non-aqueous solvents such as isopropyl alcohol, ethyl acetate, and toluene, and general-purpose adhesives such as polyvinyl alcohol, polyethylene oxide, cross-linked polyethylene oxide, and polyvinylpyrrolidone can be used. .

  In the present invention, the compounding ratio of the water-soluble dye of the coating layer and the water-soluble and / or water-absorbing adhesive, which irreversibly develops color when contacted with water-containing droplets, is a dark-colored water-soluble dye: water-soluble And / or a water-absorbing adhesive = 1: 99 to 70:30 (parts by weight).

  When the amount of the water-soluble dye is 1 part by weight or less, the absolute amount is small, the color development when wet is weak, and the detection ability is inferior. When the content is more than 70 parts by weight, the coloring ability is increased, the contrast difference between the ground color and the wet color becomes small, and the visibility of the color spot is deteriorated.

In the present invention, it is preferable that the weight of the coating layer that irreversibly develops a color when a droplet containing water comes into contact is 0.3 to 3.0 g / m ² .
An amount of 1 g / m ² or less is not preferable because the absolute amount is small, the coloration when wet is weak, and the detection ability is poor. When it is 3 g / m ² or more, it is not preferable because it becomes deeply colored without being wet with water, the difference in contrast between the ground color and the color when wet becomes small, and the visibility of the colored spot is inferior.

In the present invention, the coating layer that irreversibly develops a color when a droplet containing water comes into contact, the water-soluble dye does not dissolve in a solvent other than water such as ethanol, methanol, isopropyl alcohol, ethyl acetate, and toluene. A coating (mixture of a water-soluble dye and an adhesive) in a dispersed state in which polyvinyl alcohol, polyethylene oxide, a crosslinked polyethylene oxide, polyvinyl pyrrolidone, etc. is dispersed is formed on a substrate by coating and drying. Is preferred. If water (a solvent that dissolves a water-soluble dye) is blended in the paint, the water-soluble dye dissolves and develops color in the paint, so care must be taken not to come into contact with water. As the above-mentioned adhesive, it is preferable to use water-soluble and / or water-absorbing agents, because the dispersibility and stability of the water-soluble dye in the coating material are improved, uniform color development is obtained, and This is because the liquid droplets containing water are excellent in absorptivity.
As for the water-soluble dye used in the present invention, the dye itself is a general dark-colored compound such as black, red, green, and indigo. By setting the blending ratio of the adhesive and the water-absorbing adhesive to a specific range, the adhesive and the solvent exhibit a colorless to light color when dispersed and held in a solvent. That is, at the time of non-contact with the droplets), the color changes from colorless to light, which reflects the color of the base material.
Therefore, the color of the coated surface of the droplet detection sheet of the present invention before color development is a color based on the base material, and the water-soluble dye dissolves and irreversibly develops color when it comes into contact with the droplets.

In the present invention, in order to improve the visibility after the color is formed on the lower surface of the coating layer capable of irreversible color formation when the droplet containing water contacts, a light color system such as white, yellow, pink, light blue, or the like ( It is preferred to use a substrate (including fluorescent colors).
In the droplet detection sheet of the present invention, as described above, it is preferable to use a combination in which a light-colored base material surface is provided with a coating layer that becomes a dark color system after coloring. This is because the sheet has versatility and has improved visibility.
However, the present invention is not limited to this, and the droplet detection sheet of the present invention may be appropriately designed in a combination of colors in which color development can be easily confirmed according to the environment in which the droplet is used. For example, the color of the substrate may be dark red or black, and the coating layer may emit yellow or blue.

  In the present invention, as the sheet-like material that can be used for the base material, general-purpose plastic sheets such as a polylactic acid-based resin sheet having biodegradability, a polypropylene resin, an impact-resistant polystyrene resin, a polyethylene terephthalate resin, and a polycarbonate resin are used. And paper sheets such as synthetic paper sheets, glazed paper, coated paper, art paper, cast-coated paper, etc., and a base material obtained by laminating and complexing these sheets (base materials) can also be used. Further, a base material in which a colorless or transparent plastic sheet is provided with a layer colored white or pale with a general dye or pigment on the surface thereof, or a white or pale opaque plastic sheet can be used as a base material.

  In the present invention, a coating method for providing a coating layer containing a water-soluble dye that irreversibly develops color when a droplet containing water contacts the substrate surface is not particularly limited, and a general coating method is used. Although a coating machine can be used, a coating machine equipped with a gravure or Meyer bar coating device is particularly preferable from the viewpoint of coating characteristics and coating amount.

  In the present invention, the substrate is not particularly limited, but from the viewpoints of economy, versatility, functionality, and environmental friendliness, preferred are single gloss paper, coated paper, art paper, and cast coated paper. These base materials are mainly wood pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulphite pulp (NBSP), and, if necessary, hemp, Non-wood pulp such as bamboo, straw and kenaf can be used in combination. If necessary, fillers such as clay, kaolin, talc, titanium dioxide, calcium carbonate, and aluminum hydroxide powder are added to these raw pulp, and sizing agents such as rosin sizing agents, and dry paper strength such as polyacrylamide are added. A paper stock is prepared by appropriately adding paper strengthening agents, wet paper strength enhancers such as polyamide / polyamine / epichlorohydrin and melamine resins, and auxiliary materials for papermaking such as a fixing agent such as a sulfate band. Uncoated paper can be obtained by a conventional method using a paper machine such as a paper machine, a twin wire paper machine, a Yankee paper machine or the like.

  In order to improve the paper surface strength of these uncoated papers, a styrene resin, a styrene / acrylic resin, a styrene / maleic resin, an alkyl ketene dimer, a starch, an oxidized starch, a hydroxyethylated starch, Chemicals such as carboxymethylated cellulose, carboxymethylated guar gum, phosphorylated guar gum, oxidized guar gum, polyvinyl alcohol, and polyacrylamide can be applied to the surface.

  Using these uncoated papers as base paper, pigments such as kaolin, calcium carbonate, titanium dioxide, and aluminum hydroxide and dispersants on well-known adhesives such as styrene / butadiene latex, methyl methacrylate / butadiene latex, starch, and polyvinyl alcohol A coating liquid is prepared by appropriately using auxiliary materials for coating such as a water-proofing agent, a preservative, a fungicide, and the like, and a known coater such as an air knife coater, a blade coater, a roll coater, or a cast coater is used. Thus, coated paper such as coated paper, art paper, cast coated paper, etc. can be obtained.

In the present invention, the basis weight of a droplet detection sheet provided with a coating layer containing a water-soluble dye which irreversibly develops color when contacted with droplets containing water is not particularly limited, but is 40 to 300 g / m ^2. Is preferable, and from the viewpoints of handleability and economy, 60 to 250 g / m ² is particularly preferable.

The droplet detection sheet of the present invention is a basic form type (FIG. 1) comprising the above-described base material and coating layer, but as shown in FIG. 2, on the coating layer 2 (surface). By further disposing the protective film 3 on the substrate, it is possible to provide a droplet detection sheet that can be easily handled while preventing the coating layer from contacting with water and developing color before use.
The protective film laminated on the coating layer has a pressure-sensitive adhesive layer on at least one side, and the pressure-sensitive adhesive of the protective film in contact with the coating layer does not attack the surface, and when the protective film is peeled off, There is no particular limitation as long as the pressure-sensitive adhesive does not destroy the coating layer surface, and a general-purpose paper-made masking pressure-sensitive adhesive sheet or a film-made masking pressure-sensitive adhesive sheet can be used. However, an adhesive sheet for masking made of a film is more preferable from the viewpoint of water resistance that the coating layer is not brought into contact with moisture. The peeling force is not particularly limited, but is preferably about 20 to 200 g / 15 mm from the viewpoint of handling. If it is less than 20 g / 15 mm, it may undesirably fall off the droplet detection sheet during handling. On the other hand, when the thickness is 200 g / 15 mm or more, the surface may be broken when peeled from the droplet detection sheet, which is not preferable.

In addition, as shown in FIG. 3, an adhesive layer 4 is formed on the surface of the base material 1 opposite to the surface on which the coating layer 2 is provided, in the basic form type of the droplet detection sheet of the present invention (FIG. 1). The release sheet material 5 may be provided on the pressure-sensitive adhesive layer 4. This makes it possible to use the pressure-sensitive adhesive layer to attach the droplet detection sheet to an arbitrary structure (at least, an object having a surface portion capable of contacting the pressure-sensitive adhesive layer). Also in this case, a form having the protective film 3 on the coating layer 2 is a suitable droplet detection sheet.
In the preferred droplet detection sheet, the pressure-sensitive adhesive layer has a so-called adhesive sheet shape provided on the opposite surface of the droplet detection sheet on which the protective film is laminated and protected by a release sheet. The pressure-sensitive adhesive is not particularly limited as long as a desired adhesive strength is obtained, and a general-purpose acrylic pressure-sensitive adhesive or rubber-based pressure-sensitive adhesive can be used. Adhesion is sufficient to adhere to fixed objects such as fences, fences, exterior walls and other structures, natural objects such as rocks, trees, branches and leaves, and artificial objects such as machines and devices. The thickness is not particularly limited as long as it does not peel or fall off, but is preferably about 100 to 1000 g / 15 mm. If it is less than 100 g / 15 mm, it may fall off depending on the object, which is not preferable. On the other hand, if the thickness is 1000 g / 15 mm or more, there is a possibility that the object cannot be peeled off or the surface of the object may be broken, which is not preferable.
The release sheet material is not particularly limited as long as it has an appropriate release property with respect to the adhesive, and a general-purpose release paper or a release film coated with a silicone release agent can be used.

[Example 1]
The water-soluble dye powder (Kayafect Blue NRE manufactured by Nippon Kayaku) is classified by a sieving test method specified in JIS K0069-1992, and the sieve residue having a nominal opening of 75 μm is 0.1% or less, and the nominal A powder having a sieve residue of 53 μm and a range of 95% or more was collected.
Polyvinylpyrrolidone (K-90, manufactured by Nippon Shokubai) is dissolved in isopropyl alcohol to prepare a binder solution having a concentration of 10% by weight. The water-soluble dye powder is dispersed and diluted with isopropyl alcohol. A water-soluble dye dispersion having a solids concentration of 8.3% by weight was prepared with pyrrolidone = 62: 38 (solids weight ratio).
The above water-soluble dye dispersion was solidified on a cast coat surface of cast coat paper (Nippon Paper Industries Esprit VW, basis weight 210 g / m ² ) having a smoothness of 3000 seconds with a Meyer bar at a solid content of 0.6 g / m ^2. After coating, a droplet sensing sheet of the present invention was prepared.
The cast coated paper was white, and the color of the surface of the droplet sensing sheet before use, in which the water-soluble dye dispersion was formed as a coating layer, was slightly bluish white.
When 4 μl of pure water was dropped on the sheet with a microsyringe, the portion where the water droplet was dropped developed a deep blue color, and the blue coloring portion was fixed in a circle having the same diameter as the diameter of the droplet by absorption over time and drying on the base paper. The contact was visually recognizable, and the colored portion could be stored without being deformed or discolored.

[Example 2]
The procedure of Example 1 was repeated, except that the mixing ratio of polyvinylpyrrolidone and the water-soluble dye powder in the water-soluble dye dispersion was changed to water-soluble dye: polyvinylpyrrolidone = 55:45 (solid content weight ratio). The droplet detection sheet of the invention was produced.

[Example 3]
In Example 1, the particle size of the water-soluble dye powder was 0.1% or less for a sieve residue having a nominal opening of 106 μm and a sieve residue having a nominal opening of 45 μm according to a sieving test method specified in JIS K0069-1992. A droplet detection sheet of the present invention was prepared in the same manner as in Example 1, except that the content was in the range of 95% or more.

[Example 4]
A water solution having a sieve residue having a nominal opening of 75 μm and a sieve residue having a nominal opening of 45 μm in a range of 95% or more according to a sieving test method specified in JIS K0069-1992. Of a 48% by weight water-soluble dye dispersion obtained by dispersing a water-soluble dye powder (Kayafect Blue NRE manufactured by Nippon Kayaku) in isopropyl alcohol and a 10% by weight crosslinked polyethylene oxide (Aquacork TWB manufactured by Sumitomo Seika) A water-soluble dye dispersion having a solids concentration of 10.4% by weight was prepared by mixing the ethyl acetate solution with a water-soluble dye powder / polyethylene oxide crosslinked product = 1/99 (solids weight ratio).
The above water-soluble dye dispersion was applied to the cast coat surface of a cast coat paper (Nippon Paper Esprit V, basis weight 210 g / m ² ) having a surface smoothness of 3000 seconds using an applicator bar, and the solids adhesion amount was reduced. A color-forming layer of 3 g / m ² was applied to prepare a droplet detection sheet of the present invention.
When 4 μl of pure water was dropped on the sheet with a microsyringe, the water drop portion developed a deep blue color, the water droplet was quickly absorbed into the sheet, and the blue color portion was fixed in a circle having the same diameter as the water droplet diameter by drying. Was visually recognizable, and the color-developed portion could be stored without deformation or discoloration. Furthermore, since the colored dye was held inside the crosslinked polyethylene oxide, the colored dye did not adhere to fingers and the like, and was easy to handle.

[Example 5]
A protective film (Sanitect Y manufactured by San-A Kaken Co., Ltd.) was laminated and bonded to the coated surface of the droplet detection sheet of Example 1 by a pressure roll method. When handling the droplet detection sheet, if a finger comes into contact with the coating layer, the part may develop (fear) in the form of a fingerprint due to hand sweat. Therefore, it is desirable to wear gloves. In the case of lamination, handling could be performed easily without any problem even if touched directly with bare hands. At this time, the peeling force of the protective film on the surface of the droplet detection sheet is 55 g / 15 mm, so that the protective film can be easily peeled without breaking the surface, and does not affect the surface of the droplet detection sheet and no change is observed. Was.

[Example 6]
Using a substrate obtained by laminating a protective film on the coated surface of the droplet detection sheet of Example 5 as a surface substrate, an adhesive (SK Dyne 1035 manufactured by Soken Chemical Co., Ltd.) was applied to release paper (EK100LT manufactured by Lintec) using a normal adhesive processing machine. ) Was applied so as to have a coating amount of 25 g / m ² (dry weight), and a pressure-sensitive adhesive sheet was obtained by a transfer method. At this time, the adhesive strength of the droplet detection adhesive sheet was 500 g / 15 mm, and the adhesive sheet was sufficiently fixed to the vertical surfaces of the wire mesh fence and the block fence, and could be easily peeled when peeled. When the object to be fixed was a painted surface of a mechanical device, the adhesion of the droplet detection sheet tended to be high, but in this case, it could be peeled off.

[Evaluation]
The evaluation method of the droplet detection sheet of the present invention is as follows. A tape-like droplet detection sheet having a width of 50 mm and a length of 1.5 m is placed on a floor in a windless indoor room, and the liquid is hand sprayed from a point of 1 m in height with water. The liquid was sprayed toward the droplet detection sheet, and the sensitivity, visibility, and scattering distribution when the droplets came into contact and developed color were qualitatively evaluated.

In addition, as for the storage stability, a change (discoloration, decoloration, spot size) of the color spot after 7 days was visually confirmed.
：: Good in sensitivity and visibility such as size, color tone and contrast of color spot ×: Other than the above

DESCRIPTION OF SYMBOLS 1 Base material 2 Coating layer 3 Protective film 4 Adhesive layer 5 Peelable sheet material

Claims (6)

Sheet-shaped substrate, a droplet detection sheet having a coating layer provided on the surface of the substrate and capable of irreversible color development,
The coating layer contains a water-soluble dye and a water-soluble and / or water-absorbing adhesive (excluding polyvinyl alcohol) that irreversibly develops color when it comes into contact with liquid droplets containing water. It further has the property of dissolving in solvents other than aqueous ,
As for the particle size of the water-soluble dye contained in the coating layer, the sieve residue having a nominal opening of 106 μm according to the sieving test method specified in JIS K0069-1992 is 0.1% or less, and the nominal opening is 0.1% or less. A droplet detection sheet having a sieve residue of 45 μm in a range of 95% or more, wherein the water-soluble dye is dispersed and held in the adhesive and the solvent .   2. The droplet detection sheet according to claim 1, wherein the base material is white or light-colored, and the coated layer after coloring is a dark-colored one. 3. The compounding ratio of the water-soluble dye and the adhesive contained in the coating layer is water-soluble dye: adhesive = 1: 99 to 70:30 (parts by weight of solid content). The droplet detection sheet according to claim 1 . The coating layer, the liquid-droplet detecting sheet according to any one of claims 1 to 3, characterized in that it is 0.3 to 3.0 g / ^{m 2.} The droplet detection sheet according to any one of claims 1 to 4 , wherein a peelable protective film is laminated on the coating layer. Wherein the coating layer is provided face an adhesive layer provided on a surface of said substrate opposite to claims 1 to 5 peelable sheet material adhesive layer on which is characterized in that are stacked The droplet detection sheet according to any one of the above.

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