JP2007292932A - Adhesive label, adhesive label with releasing sheet, and information reading method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive label for allowing correct reading of information printed in fluorescent ink on a print surface. <P>SOLUTION: The adhesive label 10 has a print surface 11a to print information in ink which generates fluorescence when irradiated with stimulation light, and is irradiated with stimulation light to read the above information. It has a printing base 11 whose one surface is a print surface 11a and the other is an adhesive layer 12. The adhesive layer contains a first light absorption agent to absorb the stimulation light and a second light absorption agent to absorb the light of the wavelength to detect the fluorescence. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive label on which information such as a barcode is printed with ink that generates fluorescence when irradiated with excitation light, and a pressure-sensitive adhesive label with a release sheet. The present invention also relates to an information reading method for reading information printed by ink that generates fluorescence when irradiated with excitation light.

  When sorting postal items such as postcards or sealed letters, first, the central post office reads the postal code and postal address information of the postal items with an image reading device, converts the read character information into a bar code and converts it into postal items. A method is known in which, after printing, it is delivered to a local post office, the barcode is read at the local post office, and mails are automatically sorted based on the read destination information (see Patent Document 1). ).

In barcode printing in this sorting method, for example, ink that generates fluorescence when irradiated with excitation light (hereinafter, ink that generates fluorescence when irradiated with excitation light is referred to as fluorescent ink) is used.
As a barcode reading method, a method is generally employed in which ultraviolet light is applied to the barcode as excitation light, and the fluorescence detection wavelength light generated in the barcode is detected by a sensor and read. In general, the peak wavelength of fluorescence generated from a barcode is selected as the detection wavelength.

By the way, addresses and postmarks are pre-printed on postal items. Substances that generate fluorescence when irradiated with ultraviolet rays (hereinafter referred to as fluorescent substances) May be included). For this reason, when a barcode is printed directly on a destination, postmark, etc., fluorescence is emitted from a portion other than the barcode (hereinafter referred to as fluorescence generated in a portion other than the barcode) when the ultraviolet ray is irradiated for barcode reading. This is referred to as noise fluorescence). If the noise fluorescence includes light of the detection wavelength, the sensor also detects light of the detection wavelength in the noise fluorescence, making it difficult to accurately read the barcode.
In addition, the postal matter itself may include a fluorescent material as a colorant, and in that case, the same problem as described above may occur.
Therefore, in order not to print the barcode directly on the mail, a method is proposed in which an adhesive label having a printing surface is stuck on the mail and the barcode is printed on the printing surface of the adhesive label. (See Patent Document 2).
Japanese Patent Laid-Open No. 08-150375 Japanese Patent Laid-Open No. 08-337228

However, even if the barcode is printed on the printing surface of the pressure-sensitive adhesive label as in the method described in Patent Document 2, the barcode may not be accurately read by the sensor.
Moreover, such a problem may occur not only in postal items but also in documents and articles or their packaging.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pressure-sensitive adhesive label and a pressure-sensitive adhesive label with a release sheet that can accurately read information printed with fluorescent ink on a printing surface. It is another object of the present invention to provide an information reading method capable of accurately reading information printed with fluorescent ink on a printing surface of an adhesive label with a sensor.

The present inventors investigated the reason why the barcode cannot be accurately read by the method described in Patent Document 2 in which a barcode is printed on the printing surface of the adhesive label. It was found that it was because the label was transmitted. When part of the ultraviolet light passes through the adhesive label, the transmitted ultraviolet light generates noise fluorescence in the fluorescent material in the mail or in the fluorescent ink used to print destinations and postmarks. It has been found that the barcode cannot be read accurately because it contains the light.
Based on this knowledge, the following pressure-sensitive adhesive label, pressure-sensitive adhesive label with release sheet, and information reading method were invented.

The present invention includes the following configurations.
[1] An adhesive label having a printing surface on which information is printed by ink that generates fluorescence when irradiated with excitation light, and irradiated with excitation light to read the information,
A printing substrate having one surface as a printing surface, and an adhesive layer provided on the other surface of the printing substrate,
An adhesive label comprising: a first light absorber that absorbs the excitation light; and a second light absorber that absorbs light having a wavelength for detecting fluorescence.
[2] The pressure-sensitive adhesive label according to [1], wherein the first light absorber and the second light absorber are contained in the pressure-sensitive adhesive layer.
[3] The pressure-sensitive adhesive label according to [1] or [2], wherein the total light transmittance of visible light is 50% or more.
[4] The pressure-sensitive adhesive label according to any one of [1] to [3], wherein the pressure-sensitive adhesive layer has removability.
[5] An adhesive label with a release sheet, comprising the adhesive label according to any one of [1] to [4] and a release sheet laminated on the adhesive layer of the adhesive label.
[6] Adhesive labels of [1] to [4] are adhered to the adherend with the adhesive layer, and information is printed on the printing surface of the printing substrate with ink that generates fluorescence when irradiated with excitation light. A method of reading information, wherein the information is read by irradiating the information with excitation light to generate fluorescence, and detecting light having a wavelength for detecting the fluorescence.

The pressure-sensitive adhesive label of the present invention accurately reads information printed with fluorescent ink on the printing surface.
In the pressure-sensitive adhesive label of the present invention, if the first light absorber and the second light absorber are contained in the pressure-sensitive adhesive layer, the first light absorber and the second light absorber can be easily contained in the pressure-sensitive adhesive label. Can be contained.
When the visible light total light transmittance of the pressure-sensitive adhesive label of the present invention is 50% or more, the adherend to which the pressure-sensitive adhesive label is attached can be easily visually recognized through the pressure-sensitive adhesive label.
If the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label of the present invention has removability, it can be re-peeled after the pressure-sensitive adhesive label is attached to an adherend.
In the pressure-sensitive adhesive label with a release sheet of the present invention, information printed with fluorescent ink on the printing surface is accurately read.
According to the information reading method of the present invention, information printed with fluorescent ink on the printing surface of the adhesive label can be read accurately.

"Adhesive label"
An embodiment of the pressure-sensitive adhesive label of the present invention will be described.
In FIG. 1, the adhesive label of this embodiment is shown. The pressure-sensitive adhesive label 10 of this embodiment is attached to a postal matter such as a postcard or an envelope, has a printing surface 11a on which a barcode as information is printed by fluorescent ink, and is excitation light for reading the barcode. It is irradiated with ultraviolet rays.
Further, the pressure-sensitive adhesive label 10 of the present embodiment includes a printing substrate 11 having one surface as a printing surface 11a, and an adhesive layer 12 provided on the other surface of the printing substrate 11. It is.

(Substrate for printing)
The substrate 11 for printing may be translucent to visible light or transparent to visible light, but the surface of the postal item when pasted on a postal item Can be easily visually recognized through the pressure-sensitive adhesive label 10, so that a transparent one is preferable.
Examples of the transparent substrate include glassine paper subjected to strong supercalender treatment, coated paper impregnated or coated with a clarifying agent, parchment paper, transparent plastic film, and translucent synthetic paper.

  When the printing substrate 11 is transparent to visible light, the surface of the mail can be more easily seen through the pressure-sensitive adhesive label 10, so that the total light transmittance of visible light of the printing substrate 11 is 60. % Or more is preferable, and 80% or more is more preferable. In addition, the total light transmittance with respect to visible light in this invention is a value measured with the light of D65 based on JISK7361-1.

  The printing substrate 11 is preferably provided with an ink receiving layer including inorganic fine particles such as silica, a cationic compound, and a binder such as polyvinyl alcohol on the printing surface 11a side. If an ink receiving layer is provided on the printing surface 11a side of the printing substrate 11, ink absorbability is improved and bleeding can be prevented, so that printing can be performed clearly when a barcode is printed with fluorescent ink. .

The average primary particle diameter of the inorganic fine particles contained in the ink receiving layer is preferably 30 nm or less, and more preferably 3 to 15 nm. When the average primary particle diameter of the inorganic fine particles is 30 nm or less, an ink receiving layer having high transparency and excellent print density, bleeding, and ink absorbability can be obtained.
The average particle diameter referred to in the present invention is the particle diameter observed with an electron microscope (SEM and TEM) (taken an electron micrograph of 10,000 to 400,000 times, and measured the Martin diameter of particles in a 5 cm square. Averaged, as described in “Particle Handbook”, Asakura Shoten, p52, 1991, etc.).

  When the inorganic fine particles are aggregated particles (secondary particles) in which primary particles are aggregated, the average secondary particle diameter is not particularly limited, but is preferably 0.05 to 1.0 μm, More preferably, it is 0.5 μm.

The specific surface area of the inorganic fine particles by BET method is preferably 100 m ² / g or more, and preferably about 1000 m ² / g or less. More preferably, it is 200-400 m < ² > / g.
The BET method referred to in the present invention is one of powder surface area measurement methods by vapor phase adsorption, and is a method for determining the total surface area, that is, the specific surface area of a 1 g sample from an adsorption isotherm.

  Examples of the inorganic fine particles include zeolite, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, talc, silica, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, Examples thereof include aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, silica, aluminum hydroxide, alumina, alumina hydrate, aluminosilicate, boehmite, and pseudoboehmite. Among these, silica, alumina, alumina hydrate and aluminosilicate are particularly preferable from the viewpoint of ink absorbability, and silica is particularly preferable. Further, among silicas, gas phase method silica is preferable because of its higher transparency.

Vapor phase silica is also called a dry method as opposed to a wet method, and is formed by a flame hydrolysis method. Specifically, it is formed by burning silicon tetrachloride with hydrogen and oxygen.
In place of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane may be used alone or mixed with silicon tetrachloride. Vapor phase method silica is commercially available as a powder having a very low bulk density.

  Further, as the silica, it is also preferable to use silica-cationic compound aggregate fine particles because the transparency of the ink receiving layer, the ink coloring property and the weather resistance are increased, and the ink absorbability is further increased. Here, the silica-cationic compound aggregate fine particles are obtained by pulverizing silica-cationic compound aggregate particles obtained by mixing and aggregating amorphous silica and a cationic compound. The fine particles of the silica-cationic compound aggregate are substantially composed of secondary particles formed by aggregating primary particles.

  The amorphous silica constituting the silica-cationic compound aggregate fine particles preferably has an average primary particle diameter of 3 to 30 nm. When the average primary particle diameter is less than 3 nm, the gap between the primary particles becomes extremely small, and the ability to absorb the solvent and ink in the ink is remarkably lowered. On the other hand, if it exceeds 30 nm, the secondary particles become large and the transparency of the ink receiving layer may be lowered.

As the cationic compound used in the silica-cationic compound aggregate fine particles, various known cationic compounds generally used in an ink jet recording sheet can be used, for example, monoallylamine salt, urethane-modified allylamine salt, vinylamine salt. , Polyamine compounds, N-vinylacrylamidine salts, primary amine type cationic polymers having primary amine salts such as dicyandiamide / formalin polycondensate, dicyandiamide / polyethyleneamine polycondensate as structural units, diallylamine salts, ethyleneimine salts Secondary amine cationic polymer having a secondary amine salt as a structural unit, tertiary amine cationic polymer having a tertiary amine salt as a structural unit such as diallylmethylamine salt, diallyldimethylammonium chloride Quaternary ammonium type cationic polymer having a quaternary ammonium salt as a structural unit such as (meth) acryloyloxyethyltrimethylammonium chloride, (meth) acrylamidopropyltrimethylammonium chloride, dimethylamine / epichlorohydrin polycondensate, basic polyaluminum chloride, Examples include aluminum compounds such as basic polyfatty acid aluminum, zirconyl compounds such as zirconyl chloride, basic zirconyl chloride, and fatty acid zirconyl.
The addition amount of the cationic compound is preferably adjusted in the range of 1 to 30 parts by mass, more preferably 5 to 20 parts by mass with respect to 100 parts by mass of amorphous silica.

  As a method for pulverizing the silica-cationic compound aggregated fine particles when producing the silica-cationic compound aggregated fine particles, a breaking down method (a method of subdividing the bulk material) that gives a strong force by mechanical means is adopted. It is done. Examples of the mechanical means include an ultrasonic wave, a high-speed rotating mill, a roller mill, a container driving medium mill, a medium stirring mill, a jet mill, a disintegrator, a sand grinder, and a homogenizer.

  The average particle size of the silica-cationic compound aggregate fine particles is preferably 700 nm or less, more preferably 10 to 300 nm, and particularly preferably 20 to 200 nm. When the average particle diameter of the silica-cationic compound aggregate fine particles exceeds 700 nm, the transparency is remarkably lost and the print density may be remarkably lowered. On the other hand, if the average particle size of the silica-cationic compound aggregate fine particles is extremely small, there is a possibility that a sufficient ink absorption rate cannot be obtained.

  Examples of the cationic compound contained in the ink receiving layer include those similar to those used in the silica-cationic compound aggregate fine particles.

  The thickness of the printing substrate 11 is preferably 25 to 150 μm. If the thickness of the printing substrate 11 is 25 μm or more, the pressure-sensitive adhesive label 10 is hardly broken, and if it is 150 μm or less, the flexibility of the pressure-sensitive adhesive label 10 is not impaired and the handleability is excellent.

(Adhesive layer)
The pressure-sensitive adhesive layer 12 in the present embodiment is a layer composed of a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive, a first light absorber, and a second light absorber.

<Adhesive>
The pressure-sensitive adhesive is not particularly limited, and for example, natural rubber-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and the like are used. Moreover, any of solvent system, emulsion system, and water system may be sufficient.
Among the pressure-sensitive adhesives, solvent-type acrylic pressure-sensitive adhesives, urethane pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives are preferable from the viewpoints of transparency to visible light and compatibility with the second light absorber.

In addition, since the pressure-sensitive adhesive layer 12 has removability and the pressure-sensitive adhesive label 10 can be easily peeled off after the pressure-sensitive adhesive label 10 has finished its use, the pressure-sensitive adhesive is a re-peelable pressure-sensitive adhesive. It is preferable.
The removable pressure-sensitive adhesive is not particularly limited as long as it has removability, and examples thereof include a removable pressure-sensitive adhesive in which the pressure-sensitive adhesive is crosslinked with a crosslinking agent.

  Other auxiliary agents may be added to the adhesive as necessary. Other auxiliary agents include thickeners, pH adjusters, tackifiers, binders, crosslinking agents, adhesive fine particles, antifoaming agents, antiseptic / antifungal agents, pigments, inorganic fillers, stabilizers, wetting agents, wetting agents. Etc.

  Moreover, in order to obtain the pressure-sensitive adhesive layer 12 having removability, fine particles having no pressure-sensitive adhesive are mixed in the pressure-sensitive adhesive layer 12, or minute unevenness is formed on the surface of the pressure-sensitive adhesive layer 12 to be adhered. May be formed.

<First light absorber>
The first light absorber in the present embodiment absorbs ultraviolet rays irradiated to read the barcode printed on the printing surface 11a of the printing substrate 11 with the fluorescent ink. It is called.
Examples of the first light absorber in the present embodiment include a benzotriazole ultraviolet absorber and a benzophenone ultraviolet absorber.

The benzotriazole-based ultraviolet absorber specifically absorbs ultraviolet rays having a wavelength of 280 to 360 nm.
Specific examples of the benzotriazole ultraviolet absorber include 2- (2′-hydroxyphenyl) benzotriazole and 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (for example, manufactured by Ciba Specialty Chemicals) Trade name Tinuvin P), 2- (5-t-octyl-2-hydroxyphenyl) benzotriazole (for example, Chemisorb 79 manufactured by Chemipro Kasei Co., Ltd.), 2- (2′-hydroxy-5′-tert-butylphenyl) benzo Triazole, 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) benzotriazole, 2- (2 ′ -Hydroxy-3'-di-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazol 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-amylphenyl) ) Benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-tert-butylbenzotriazole, 2,2′-methylenebis [4- (1,1,3, 3-tetramethylbutyl) -6-benzotriazolyl-phenol], 2,2'-methylenebis (3-methoxy-6-benzoylphenol), 2,2'-octylidenebis [4-methyl-6- (5 ' -Methylbenzotriazolyl) phenol] and the like.

A benzophenone-based ultraviolet absorber specifically absorbs ultraviolet rays having a wavelength of 300 nm or less.
Specific examples of the benzophenone ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2 Examples include '-dihydroxy-4-methoxybenzophenone, 2,2'-hydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone.
Only one type of first light absorber may be used, or two or more types may be used in combination.

  The content of the first light absorber in the pressure-sensitive adhesive layer 12 is preferably 0.1 to 10 parts by mass and more preferably 1 to 7 parts by mass with respect to 100 parts by mass of the adhesive solid content. preferable. If the content of the first light absorber is 0.1 parts by mass or more with respect to 100 parts by mass of the pressure-sensitive adhesive solid content, the ultraviolet rays irradiated for reading the barcode can be absorbed more, and the ultraviolet rays can be absorbed into the adhesive label 10. Can be further prevented. Moreover, if it is 10 mass parts or less with respect to 100 mass parts of adhesive solid content, since the adhesive fall of the adhesive layer 12 can be prevented and it is not contained excessively, it is economical.

<Second light absorber>
The second light absorbing agent absorbs light having a wavelength for detecting fluorescence (usually visible light) generated by ultraviolet rays irradiated to read a barcode. Thereby, the light of the wavelength for a detection among the noise fluorescence which generate | occur | produces from other than a barcode can be absorbed.
As the second light absorber, for example, a colorant having a maximum absorption wavelength in the vicinity of the detection wavelength can be used.

Specifically, when the detection wavelength is a blue region having a wavelength of 420 to 440 nm, a yellowish colorant that absorbs light having a wavelength of 420 to 440 nm should be used as the second light absorber. Is preferred. Examples of the yellowish colorant include Kayaset Yellow 2G (maximum absorption wavelength: 424 nm, half width of absorption wavelength: 62 nm, manufactured by Nippon Kayaku Co., Ltd.).
When the detection wavelength is in the green region of 530 to 550 nm, it is preferable to use a reddish colorant that absorbs light of wavelength 530 to 550 nm as the second light absorber. Examples of the reddish colorant include Kayaset Red B (maximum absorption wavelength: 516 nm, half width of absorption wavelength: 93 nm, manufactured by Nippon Kayaku Co., Ltd.).
When the detection wavelength is in the red region of 610 to 630 nm, it is preferable to use a blue-tinged colorant that absorbs light of wavelength 610 to 630 nm as the second light absorber. Examples of blue-colored coloring agents include Kayaset Blue N (maximum absorption wavelength: 649 nm, half-width of absorption wavelength: 94 nm, manufactured by Nippon Kayaku Co., Ltd.), Kayaset Blue 714 (maximum absorption wavelength: 639 nm, absorption) Wavelength half width: 108 nm, manufactured by Nippon Kayaku Co., Ltd., TAP10 (maximum absorption wavelength: 604 nm, absorption wavelength half width: 26 nm, manufactured by Yamada Chemical Co., Ltd.), Diplacoat Blue NV20 (maximum absorption wavelength: 624 nm, absorption wavelength) FWHM; 188 nm, manufactured by Dainichi Seika Co., Ltd.).
Only one type of second light absorber may be used, or two or more types may be used in combination.

  It is preferable that content of the 2nd light absorber in the adhesive layer 12 is 0.01-1.5 mass parts with respect to 100 mass parts of adhesive solid content, 0.015-1.0 mass. More preferably, it is a part. If content of a 2nd light absorber is 0.01 mass part or more with respect to 100 mass parts of adhesive solid content, the light of the wavelength for a detection among noise fluorescence can be absorbed more. Moreover, if it is 1.5 mass parts or less with respect to 100 mass parts of adhesive solid content, the coloring of the adhesive layer 12 can be prevented and the adhesiveness fall of the adhesive layer 12 can be prevented.

The pressure-sensitive adhesive layer 12 is preferably formed by coating the pressure-sensitive adhesive composition at a dry coating amount of 5 to 40 g / m ² , and is formed by coating at a dry coating amount of 10 to 30 g / m ^2. Are preferred. If the pressure-sensitive adhesive layer 12 is formed by coating the pressure-sensitive adhesive composition at a dry coating amount of 5 g / m ² or more, the pressure-sensitive adhesive label 10 can be reliably attached to a mail piece, and the dry coating amount. If it is formed by coating at 40 g / m ² or less, it is not necessary to use an unnecessary pressure-sensitive adhesive composition.

(Transparency of adhesive label to visible light)
The adhesive label 10 is preferably highly transparent to visible light because the surface of a postal item to be attached can be easily visually recognized through the adhesive label 10. Specifically, the adhesive label 10 transmits all visible light through the visible light. The rate is preferably 50% or more.

  As will be described later, the pressure-sensitive adhesive label 10 of this embodiment may be formed by laminating a release sheet on the pressure-sensitive adhesive layer 12 to form a pressure-sensitive adhesive label with a release sheet, and the pressure-sensitive adhesive layer 12 is provided on the printing surface 11 a of the printing substrate 11. It is good also as a wound thing by winding, bonding. In the case of a wound product, it is preferable to apply a release agent to the printing surface 11a so that the pressure-sensitive adhesive layer 12 can be easily peeled off from the printing surface 11a of the printing substrate 11. Further, non-silicone release agents are preferred because they do not repel fluorescent ink among release agents.

The above-mentioned pressure-sensitive adhesive label 10 is used by being stuck to a mail piece by the pressure-sensitive adhesive layer 12 and printing a barcode on the printing surface 11a of the printing substrate 11 with fluorescent ink.
In this pressure-sensitive adhesive label 10, when the barcode is irradiated with ultraviolet rays in order to read the barcode printed on the printing surface 11 a, the pressure-sensitive adhesive label 10 enters the pressure-sensitive adhesive label 10 by the first light absorber in the pressure-sensitive adhesive layer 12. Can absorb ultraviolet rays. As a result, it is difficult for ultraviolet rays to pass through the adhesive label 10 and to reach the postal matter, so that noise fluorescence is unlikely to occur.
Further, the ultraviolet rays that reach the postal matter without being absorbed by the first light absorber in the pressure-sensitive adhesive layer 12 hit the fluorescent substance in the postal matter or the fluorescent ink used for printing the postal matter, and generate noise fluorescence. Even if the noise fluorescence includes light having a detection wavelength, the second light absorber in the pressure-sensitive adhesive layer 12 can absorb light having the detection wavelength in the noise fluorescence.
Therefore, the use of the adhesive label 10 makes it difficult for noise fluorescence to occur, and can absorb light having a detection wavelength from the generated noise fluorescence, so that light having a detection wavelength can be selectively detected by the sensor. The bar code can be read accurately.

  Further, since the pressure-sensitive adhesive label 10 includes the first light absorber and the second light absorber in the pressure-sensitive adhesive layer, the first light absorber and the second light absorber are contained in the pressure-sensitive adhesive label 10. Can be easily contained.

"Adhesive label with release sheet"
One Embodiment of the adhesive label with a peeling sheet of this invention is described.
In FIG. 2, the adhesive label with a peeling sheet of this embodiment is shown. The pressure-sensitive adhesive label 1 with a release sheet according to this embodiment includes the pressure-sensitive adhesive label 10 described above and a release sheet 20 laminated on the pressure-sensitive adhesive layer 12 of the pressure-sensitive adhesive label 10.

(Peeling sheet)
Examples of the release sheet 20 include those having a release sheet substrate and a release agent layer provided on the pressure-sensitive adhesive layer 12 side of the release sheet substrate.
Examples of the release sheet substrate include paper such as high-quality paper and glassine paper, and plastic films such as polyethylene terephthalate film and polypropylene film.
As the release agent constituting the release agent layer, for example, a general-purpose addition type or condensation type silicone release agent or a long-chain alkyl group-containing compound is used. In particular, an addition type silicone release agent having high reactivity is preferably used.
Specific examples of silicone release agents include BY24-4527 and SD-7220 manufactured by Toray Dow Corning Silicone, KS-3600, KS-774, and X62-2600 manufactured by Shin-Etsu Chemical Co., Ltd. Is mentioned. Further, the silicone-based release agent may contain a silicone resin that is an organosilicon compound having a SiO ₂ unit and (CH ₃ ) ₃ SiO _1/2 unit or CH ₂ ═CH (CH ₃ ) SiO _1/2 unit. preferable. Specific examples of the silicone resin include BY24-843, SD-7292, SHR-1404, etc. manufactured by Toray Dow Corning Silicone, KS-3800, X92-183, manufactured by Shin-Etsu Chemical Co., Ltd., and the like.

(Manufacturing method of adhesive label with release sheet)
As a method for producing the pressure-sensitive adhesive label 1 with a release sheet, for example, a liquid pressure-sensitive adhesive composition is applied to one side of a printing substrate 11 and dried to form a pressure-sensitive adhesive layer 12. The method of laminating | stacking the peeling sheet 20 on top is mentioned.
Examples of a method for obtaining a liquid pressure-sensitive adhesive composition include a method in which a first light absorber and a second light absorber are dissolved or dispersed in a solvent-based, emulsion-based, or water-based pressure-sensitive adhesive. If a solvent system is used as the pressure-sensitive adhesive and a solvent that dissolves in the solvent is used as the first light absorber and the second light absorber, the first light absorber and the second light absorber are uniform in the pressure-sensitive adhesive. Can be obtained.
As a coating apparatus for the liquid pressure-sensitive adhesive composition, for example, a comma coater, roll coater, knife coater, bar coater, air knife coater, gravure coater, curtain coater, lip coater, die coater and the like can be used.
The drying method may be natural drying, drying with hot air, or drying by infrared irradiation.

  As another method for producing the pressure-sensitive adhesive label 1 with a release sheet, a liquid pressure-sensitive adhesive composition is applied on the release sheet 20 and dried to form the pressure-sensitive adhesive layer 12. The method of bonding the base material 11 is mentioned.

  The pressure-sensitive adhesive label 1 with a release sheet is used by peeling the release sheet 20 to expose the pressure-sensitive adhesive layer 12 and sticking it to a mail piece with the exposed pressure-sensitive adhesive layer 12.

"Information Reading Method"
An embodiment of the information reading method of the present invention will be described. This embodiment is an example using the adhesive label 1 with a peeling sheet mentioned above.
In this embodiment, first, at the central post office, the release sheet 20 of the pressure-sensitive adhesive label with release sheet 1 is peeled to expose the pressure-sensitive adhesive layer 12, and the pressure-sensitive adhesive layer 12 is made into a postal matter by the exposed pressure-sensitive adhesive layer 12. Adhere. Next, the character information such as the address of the mail that has been read in advance by the image reading device is converted into a barcode, and the barcode is printed on the printing surface 11 a of the printing substrate 11 of the adhesive label 10 with fluorescent ink. As a printing method at that time, for example, an inkjet printing method can be applied. After printing, a barcode reader (barcode reader) is used to irradiate the barcode printed on the printing substrate 11 with ultraviolet rays to generate fluorescence, and the light having the wavelength for detecting fluorescence is detected by the sensor. Read the barcode.
Then, using the read address information of the barcode, the mail is sorted by an automatic sorting device and delivered to a local post office.
At the local post office that received the mail, the bar code is read and the mail is sorted and delivered in the same manner as described above.
In addition, since the adhesive label 10 becomes unnecessary after sorting, it may be peeled off from the mail.

  In the information reading method described above, since the above-described adhesive label 10 is used, the detection wavelength can be selectively detected by the sensor when the ultraviolet ray is irradiated to read the barcode, and the barcode is read accurately. be able to.

In addition, this invention is not limited to embodiment mentioned above. For example, in the above-described embodiment, the first light absorber and the second light absorber are included only in the pressure-sensitive adhesive layer 12, but the first light absorber and the second light absorber are the pressure-sensitive adhesive labels. For example, the first light absorber and the second light absorber may be included only in the printing substrate 11, or the first light absorber and the second light absorber may be included in any part. One of the light absorbers may be included in the pressure-sensitive adhesive layer 12 and the other may be included in the printing substrate 11. The first light absorber and the second light absorber may be included in both the printing substrate 11 and the pressure-sensitive adhesive layer 12.
In the pressure-sensitive adhesive label, an undercoat layer for sealing may be provided between the printing substrate 11 and the pressure-sensitive adhesive layer 12, and in that case, the first light absorber is provided on the undercoat layer. And you may contain the 2nd light absorber.

In the embodiment described above, the adherend is a postal item, but the present invention is not limited to this, and may be a document, an article, or a package thereof.
In the embodiment described above, the information printed on the printing surface 11a of the printing substrate 11 is a barcode. However, information other than the barcode, for example, a character, a design, or the like may be used.
In the embodiment described above, the excitation light is ultraviolet light, but it may be excitation light having a wavelength other than the ultraviolet region. In that case, it is necessary to select the 1st light absorber according to the excitation light.

Example 1
A solvent-based acrylic pressure-sensitive adhesive (trade name BPS-5330, manufactured by Toyo Ink Manufacturing Co., Ltd.) and a crosslinking agent (BXX5134, manufactured by Toyo Ink Manufacturing Co., Ltd.) are added to 100 parts by weight of the acrylic pressure-sensitive adhesive in a state containing a solvent. 2 parts by weight (based on 100 parts by weight of the acrylic adhesive in the wet state), the first light absorber (2- (2′-hydroxy-5′-methylphenyl) benzotriazole, Ciba Spatialty -3 parts by mass of Tinuvin P) manufactured by Chemicals Co., Ltd. was added to 100 parts by mass of the acrylic adhesive solid content, and the mixture was sufficiently stirred. Furthermore, 0.03 parts by mass of an oil-soluble dye (Kayaset Blue 714, manufactured by Nippon Kayaku Co., Ltd.) as a second light absorber is added to 100 parts by mass of the acrylic adhesive solid content, and the mixture is sufficiently stirred. Thus, a pressure-sensitive adhesive composition (1) was prepared.
Next, the pressure-sensitive adhesive composition (1) is coated on a glassine paper release paper (manufactured by Oji Tac Co., Ltd.) with a comma coater so that the dry coating amount is 15 g / m ² , and dried to form a pressure-sensitive adhesive layer. After that, drape W50.4 (manufactured by Oji Specialty Paper Co., Ltd.) as a printing substrate was bonded to the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive label with a release sheet.

(Example 2)
A pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that Classico tracing 35.5 (manufactured by Mitsubishi Paper Industries) was used as a substrate for printing.

(Example 3)
A pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (1) was applied so that the dry coating amount was 40 g / m ² .

Example 4
An oil-soluble dye (TAP10, manufactured by Yamada Chemical Co., Ltd.) is added as a second light absorber in an amount of 0.02 parts by mass with respect to 100 parts by mass of the acrylic adhesive solid content to prepare an adhesive composition (2). Except having used the adhesive composition (2), it carried out similarly to Example 1, and obtained the adhesive label with a peeling sheet.

(Example 5)
An adhesive label with a release sheet was prepared in the same manner as in Example 4 except that the amount of the oil-soluble dye (TAP10, manufactured by Yamada Chemical Co., Ltd.) was 0.1 parts by mass with respect to 100 parts by mass of the acrylic adhesive solid content. Obtained.

(Example 6)
As a second light absorber, 0.6 parts by mass of a pigment dispersion (Daipla Coat Blue NV20, manufactured by Dainichi Seika Kogyo Co., Ltd.) is added to 100 parts by mass of the acrylic pressure-sensitive adhesive solid content to obtain an adhesive composition (3 And a pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (3) was used.

(Example 7)
100 mass parts of acrylic pressure-sensitive adhesive solid content in a solvent-containing acrylic pressure-sensitive adhesive (BPS-5303, manufactured by Toyo Ink Manufacturing Co., Ltd.) and a crosslinking agent (BHS-8515, manufactured by Toyo Ink Manufacturing Co., Ltd.) After adding 4 parts by mass with respect to the mixture, the first light absorber (2- (5-t-octyl-2-hydroxyphenyl) benzotriazole) Chemipro Chemical Co., Ltd. Chemisorb 79) was added to 100 mass of acrylic adhesive solid content. 2 parts by mass with respect to the part was added and sufficiently stirred. Furthermore, 0.05 parts by mass of an oil-soluble dye (Kayaset Blue 714, manufactured by Nippon Kayaku Co., Ltd.) as a second light absorber is added to 100 parts by mass of the acrylic adhesive solid content to add an adhesive composition ( 4) was prepared.
The pressure-sensitive adhesive composition (4) was coated on a glassine paper release paper (manufactured by Oji Tac Co., Ltd.) with a comma coater so that the dry coating amount was 15 g / m ² and dried to form a pressure-sensitive adhesive layer. Then, Classic Tracing 41.0 (manufactured by Mitsubishi Paper Industries Co., Ltd.), which is a printing substrate, was bonded to obtain an adhesive label with a release sheet.

(Example 8)
An oil-soluble dye (Kayaset Red B, manufactured by Nippon Kayaku Co., Ltd.) is added as a second light absorber in an amount of 0.05 parts by mass with respect to 100 parts by mass of the acrylic adhesive solid content, and an adhesive composition (5) And a pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (5) was used.

Example 9
A pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that the amount of the second light absorber added was 2.0 parts by mass with respect to 100 parts by mass of the acrylic adhesive solid content.

(Example 10)
A pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that label paper 35 (manufactured by Oji Specialty Paper Co., Ltd.) was used as a printing substrate.

(Example 11)
Gas phase method silica (trade name: Aerosil 300, average particle size of primary particles: 7 nm, specific surface area by BET: 300 m ² / g, manufactured by Nippon Aerosil Co., Ltd.) and 50 mol% methoxycarbonyl-modified polyallylamine 50 parts by mass of a 20% by mass aqueous solution of hydrochloride (mass average molecular weight: about 60,000) and 850 parts by mass of ion-exchanged water were mixed. The resulting mixture was dispersed with a stirrer and then processed using a wet ultrafine atomizer Nanomizer. Next, 360 parts by mass of a 5% by mass aqueous solution of polyvinyl alcohol (trade name: PVA-245, manufactured by Kuraray Co., Ltd., saponification degree: 88% by mass, average polymerization degree: 4,500) and a small amount were added to the obtained treatment liquid. The antifoaming agent, dispersant and water were added to obtain a coating liquid for forming an ink receiving layer having a solid content concentration of 8% by mass.
Then, on one side of a translucent substrate (trade name: drape W, 50.4 g / m ² , manufactured by Oji Specialty Paper Co., Ltd.), wire the ink receiving layer forming coating liquid so that the dry mass becomes 10 g / m ^2. By applying and drying with a bar, an ink receiving layer was formed on the printing surface side to obtain a printing substrate. An adhesive label was obtained in the same manner as in Example 1 except that this printing substrate having an ink receiving layer on the printing surface side was used.

(Comparative Example 1)
A pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that the first light absorbent was not added.

(Comparative Example 2)
A pressure-sensitive adhesive label with a release sheet was obtained in the same manner as in Example 1 except that the second light absorber was not added.

  Table 1 shows the maximum absorption wavelength and the half-value width of the absorption wavelength in the second light absorber used in each example and each comparative example.

About each Example and each comparative example, barcode readability was evaluated by the following method. The evaluation results are shown in Table 1.
First, on the tea envelope (OK Craft 85 g / m ² , Oji Paper Co., Ltd.) that is the adherend, the same fluorescent ink (manufactured by Videojet Co.) as the fluorescent ink used when printing the barcode on the adhesive label, Bar code printed in advance.
Next, the release sheet of the release label-attached adhesive label was peeled to expose the adhesive layer, and the adhesive label was attached to the barcode printing portion of the tea envelope with the exposed adhesive layer.
Next, a barcode was printed on the printing surface of the pressure-sensitive adhesive label with fluorescent ink using an ink jet printer (manufactured by Videojet).
Then, the barcode printed on the adhesive label was irradiated with ultraviolet light having a wavelength of 300 to 400 nm to generate fluorescence, and the detection wavelength light shown in Table 1 of the fluorescence was detected by the sensor, and the barcode was read. . Bar code reading at that time was evaluated. The evaluation criteria are as follows.
○: The bar code could be read accurately.
X: The barcode could not be read accurately.

By using the pressure-sensitive adhesive label provided on the pressure-sensitive adhesive label with release sheet of Examples 1 to 11 in which the first light absorber and the second light absorber are contained in the pressure-sensitive adhesive layer, the adherend is bar-coated with a sensor. Could be read accurately.
On the other hand, when the pressure-sensitive adhesive layer includes the second light absorber but does not include the first light absorber, the pressure-sensitive adhesive label provided in the pressure-sensitive adhesive label with the release sheet of Comparative Example 1 is used. The bar coat could not be accurately read by the sensor.
In addition, even when the pressure-sensitive adhesive layer includes the first light absorber but does not include the second light absorber, the pressure-sensitive adhesive label provided in the pressure-sensitive adhesive label with the release sheet of Comparative Example 2 is used. Therefore, the bar coat could not be read accurately.

Moreover, about each Example and each comparative example, the visibility of the adherend through the adhesive label when the adhesive label was attached to the adherend was evaluated by the following method. The evaluation results are shown in Table 2.
First, characters of 8 fonts and RGB (234, 234, 234) were printed on high-quality paper using DocuColor 1250 manufactured by Fuji Xerox. Subsequently, the adhesive labels of each Example and each comparative example were stuck on the character. And the visibility of the character on a quality paper in the state which set the space | interval of the quality paper and eyes to about 30 cm was evaluated by visual observation. The evaluation criteria are as follows.
A: Characters printed on high-quality paper were clearly visible.
○: Characters printed on high-quality paper could be visually recognized.
(Triangle | delta): Although there is some lack in the visibility of the character printed on the quality paper, there is no practical problem.
X: Visibility of characters printed on high-quality paper was low and difficult to read.

  Further, the total light transmittance of visible light of the printing substrate used in each example and each comparative example and the total light transmittance of visible light of the pressure-sensitive adhesive label were measured according to JIS K 7361 by HZ-2 manufactured by Suga Test Instruments Co., Ltd. Measured according to 1. The results are also shown in Table 2.

In Examples 1 to 9, 11 and Comparative Examples 1 and 2 (especially Example 2) using a substrate having a high visible light total light transmittance as a printing substrate, the visible light total light transmittance of the adhesive label is also It was high and the visibility of characters on high-quality paper was high. Furthermore, in Example 11, the ink absorptivity at the time of printing and the anti-bleeding property were superior to those of other examples.
In Example 10 using a substrate having a low visible light total light transmittance as a printing substrate, the visible light total light transmittance of the pressure-sensitive adhesive label was low and the visibility of characters on the high-quality paper was low.

It is sectional drawing which shows one Embodiment of the adhesive label of this invention. It is sectional drawing which shows one Embodiment of the adhesive label with a peeling sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adhesive label with release sheet 10 Adhesive label 11 Substrate for printing 11a Printing surface 12 Adhesive layer 20 Release sheet

Claims (6)

An adhesive label having a printing surface on which information is printed by ink that generates fluorescence by irradiation of excitation light, and irradiated with excitation light to read the information,
A printing substrate having one surface as a printing surface, and an adhesive layer provided on the other surface of the printing substrate,
An adhesive label comprising: a first light absorber that absorbs the excitation light; and a second light absorber that absorbs light having a wavelength for detecting fluorescence.   The pressure-sensitive adhesive label according to claim 1, wherein the pressure-sensitive adhesive layer contains the first light absorber and the second light absorber.   The pressure-sensitive adhesive label according to claim 1 or 2, wherein the total light transmittance of visible light is 50% or more.   The pressure-sensitive adhesive label according to claim 1, wherein the pressure-sensitive adhesive layer has removability.   A pressure-sensitive adhesive label with a release sheet, comprising the pressure-sensitive adhesive label according to claim 1 and a release sheet laminated on the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label. The adhesive label of claims 1 to 4 is adhered to the adherend by the adhesive layer, and information is printed on the printing surface of the printing substrate with ink that generates fluorescence when irradiated with excitation light, An information reading method characterized by irradiating information with excitation light to generate fluorescence, and detecting information by detecting light having a wavelength for detecting the fluorescence.

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