JP2000250451A - Label sheet and label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration and contamination of a display object and to obtain a label sheet suitable for the production of various kinds in small lots by printing the label not on the surface of a base body but on the base film side, forming an adhesive layer on the label, and adhering the sheet to the base body. SOLUTION: This label sheet is used in such a manner that the display object 4 printed on one surface of a light-transmitting base film 3 is observed through the other surface and that an adhesive layer 5 is formed on the label 4 (a). Since the object 4 such as characters, symbols or figures is sealed between a base film 3 and a base body 2, curling or peeling of the object can be decreased. If necessary, an UV-absorbing layer 6 may be formed between the base film 3 and the object 4 (b). Or, the UV-absorbing layer 6 may be formed on the face of the base film 3 where light enters (c) so as to further decrease the deterioration of the object 4. Thus, mixing of air bubbles into between the base film 3 and the base body 2, or wrinkles of the base film 3 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various signs such as road signs and a sign sheet used for the signs.

[0002]

2. Description of the Related Art There are various types of road signs such as guide signs, instruction signs, regulation signs, and warning signs. In recent years, a retroreflective sheet that retroreflects light toward a light source has been widely used for road signs. When using a retroreflective sheet, a sign is printed on the sheet surface with a translucent ink, or a printed sheet is attached to a surface of a base made of a rigid material such as metal to produce a sign. . For printing, it is common to use mass printing means such as screen printing by transferring a plate. In addition, the retroreflective sheet may be cut into a predetermined shape such as an arrow to produce a marking sheet, which may be affixed to a base to serve as a sign.

However, the conventional road sign has the following problems.

[0004] The first problem is that road signs are installed outdoors, so that deterioration due to sunlight, particularly ultraviolet rays, and deterioration due to pollutants in the air are likely to progress. Further, there is a problem that the sign formed by the screen printing is easily peeled off. Further, the marking sheet also has a problem that peeling-off easily occurs due to a shape such as an arrow shape and a small bonding area.

[0005] The second problem is that since road signs are installed outdoors, they are likely to be contaminated by exhaust gas of automobiles and the like, and their visibility is easily reduced. In addition, since many of the signs are installed at a high place, there is a problem that a large amount of cost is required for maintenance work such as cleaning of contaminated signs and replacement of deteriorated signs.

[0006] The third problem is that instruction signs and guide signs can be mass-produced, but place-name guide signs and the like require high-mix low-volume production and are suitable for mass production printing such as screen printing. In the printing means, the cost is increased, and the productivity is rather lowered. Also, production of a sign by sticking a marking sheet has low productivity.

[0007]

To cope with the second problem, for example, a countermeasure is described in Japanese Patent Application Laid-Open No. Hei 7-333413. In this publication, a transparent surface layer is formed by sticking a fluororesin film or the like on the surface of a retroreflective base sheet, and when the surface is contaminated, it is wiped dry with a cloth or the like, It has been proposed to remove contamination by using such methods. However, this publication does not take account of the first and third problems.

Regarding the second problem, a proposal has been made to use a photocatalyst technology for oxidizing and decomposing organic substances using a semiconductor film and near-ultraviolet light for pollution removal. For example, a sign / sign described in JP-A-9-209319, an outdoor display panel described in JP-A-9-230810, an antifouling outdoor display panel described in JP-A-10-105071 and the like It is. However, even in these proposals, no consideration is given to the first and third problems.

An object of the present invention is to provide a sign sheet and a sign which can prevent deterioration and contamination of the sign and are suitable for high-mix low-volume production.

[0010]

The above object is achieved by the following (1).
This is achieved by any one of the constitutions (1) to (10). (1) A sign sheet for observing a sign printed on one surface of a light-transmitting base film from the other surface, the sign sheet having an adhesive layer on the sign. (2) The sign sheet according to (1), wherein the one side of the base film has an ink receiving layer, and a sign is printed on the ink receiving layer. (3) The sign sheet according to the above (1) or (2), having a photocatalyst layer containing a photocatalyst on the other surface of the base film. (4) The sign sheet according to (3), wherein the photocatalyst contains titanium oxide. (5) A sign having a substrate on which the sign sheet according to any one of (1) to (4) is attached by the adhesive layer. (6) The sign according to (5), wherein the surface of the substrate to which the sign sheet is attached has a retroreflective property. (7) The sign according to (5), wherein the sign sheet of the substrate has a light transmitting property, and the sign sheet is irradiated with light through the sign sheet attaching face. (8) The sign according to (7), wherein the surface of the substrate to which the sign sheet is attached has light diffusing properties. (9) The sign according to (7) or (8), wherein the light source is accommodated in the base. (10) The sign according to (5) or (6), further comprising a light source for irradiating the sticking surface through the sign sheet.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (a) shows an example of the configuration of a sign sheet and a sign of the present invention. The sign sheet shown in FIG. 1 has a base film 3 having a light-transmitting property, and a sign 4 is printed on one surface thereof, and the sign 4 is observed from the other surface (light incident surface). Things. In this sign sheet, an adhesive layer 5 is formed on the sign 4, and the sign sheet is adhered to the base 2 by the adhesive layer 5 to form a sign.

As described above, according to the present invention, the sign, such as characters, symbols, and designs, is sealed between the base film 3 and the base 2, so that the first problem is reduced. Note that, if necessary, an ultraviolet absorbing layer may be provided on at least one surface of the base film 3 to further reduce the deterioration of the sign. For example, in FIG.
An ultraviolet absorbing layer 6 is provided between the marker 4 and the sign 4 as shown in FIG.
In (c), an ultraviolet absorbing layer 6 is provided on the light incident surface of the base film. The ultraviolet absorbing layer 6 may be provided by attaching an ultraviolet absorbing film, or may be provided by applying a composition containing an ultraviolet absorbing agent. In addition, an ultraviolet absorbent may be kneaded into the base film 3, and the kneading and the ultraviolet absorbing layer may be used in combination.

According to the present invention, since the deterioration of the sign by light irradiation is reduced, ink that easily deteriorates, for example, an ink containing a dye, can be used for printing the sign.
As a printing means suitable for color printing in a small lot, an ink jet printer is typical. In color printing of an ink jet printer, an ink containing a dye is generally used. Therefore, the present invention is suitable for printing a sign by an ink jet printer and can cope with the production of a small lot, so that the third problem can be solved. When printing a sign by an ink jet printer, an ink receiving layer 7 is usually provided on the one surface of the base film 3 as shown in FIGS.
The sign 4 is printed on the ink receiving layer 7.

In the present invention, screen printing or the like is used.
Printing means suitable for mass printing can also be used. The formation of a sign by sticking a marking sheet can also be used. In a conventional sign, that is, a sign in which a sign is formed on the surface of a base by screen printing, the sign rises from the surface of the base. Therefore, for example, when an attempt is made to affix the protective film thereon, air bubbles are likely to be mixed between the base and the protective film, and the protective film is likely to be wrinkled. On the other hand, in the present invention, a sign is printed on the base film, an adhesive layer is formed thereon, and this is adhered to a substrate. Therefore, the unevenness of the sign is absorbed by the adhesive layer, and the surface of the adhesive layer becomes substantially flat. Therefore, it is difficult for air bubbles to enter between the base film and the base when sticking, and wrinkles are less likely to occur in the base film.

In the present invention, it is preferable to provide a photocatalyst layer containing a photocatalyst as the uppermost layer on the other surface of the base film, that is, the surface opposite to the sign printing surface. On the light incident side of (a), (b) and (c) of FIG.
FIGS. 2A, 2B, and 2C show the configuration in which the photocatalyst layer 8 is provided as the uppermost layer. Although the photocatalyst layer may be formed in contact with the base film, a protective layer for protecting the base film from the photocatalyst may be provided between the two.

This photocatalyst layer is formed by the method described in JP-A-9-20 / 1990.
What is necessary is just to make it the thing similar to the thin film and surface layer of a photocatalyst described in 9319, Unexamined-Japanese-Patent No. 9-230810, Unexamined-Japanese-Patent No. 10-105071. By providing such a photocatalyst layer, the contamination of the observation surface of the base film can be prevented, so that the second problem is reduced. In addition, since the ultraviolet rays are partially absorbed in the photocatalyst layer, the amount of the ultraviolet rays reaching the sign through the base film can be reduced.

The substrate to which the marking sheet of the present invention is attached may be the same as the substrate used for a general sign. For example, a metal plate or a resin plate, or a plate-like body having a retroreflective property on its surface by sticking a retroreflective sheet to them can be used.

In addition, a substrate may be used in which the sign sheet has a light transmitting surface and the sign sheet is irradiated with light through the sign sheet attaching face. In this case, the light source for light irradiation may be of an internally illuminated type in which the light source is housed inside the base body, or the light source may be provided on the back side of the base body and irradiated through the base body. Further, in this case, it is preferable that the surface of the substrate to which the label sheet is attached has a light diffusing property. In order to impart light diffusing property, it is preferable to provide a white translucent light diffusing layer or a light diffusing plate on the sign sheet attaching surface.

An externally illuminated sign that irradiates the sticking surface from the outside of the sign sheet through the sign sheet may be used. In the case where a photocatalyst layer is provided on the surface of the base film and an externally illuminated sign is used, it is preferable to irradiate light containing a wavelength used by the photocatalyst.

The constituent material of the light-transmitting base film used in the present invention is not particularly limited. For example, any of polyester resin, polyolefin resin, polystyrene resin, polyvinyl chloride resin, acrylic resin, polycarbonate and the like can be used. It may be. The thickness of the base film may be appropriately determined in consideration of required light transmittance, transportability in a printing machine, and the like.
It is preferable to set it to 200 μm.

The adhesive layer provided on the printed surface of the sign is preferably composed mainly of, for example, a pressure-sensitive adhesive or a heat-sensitive adhesive.
Examples of the pressure-sensitive adhesive include natural rubber, synthetic rubber, acrylic resin, polyvinyl ether, urethane resin, and silicone resin. Specific examples of the natural rubber-based adhesive include styrene-butadiene rubber, isobutylene rubber, isobutylene-isoprene rubber, isoprene rubber, styrene-isoprene block copolymer,
Styrene-butadiene block copolymer and styrene-ethylene-butylene block copolymer are exemplified. Specific examples of the acrylic resin-based adhesive include acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, ethyl methacrylate, ethyl methacrylate, homopolymer of acrylonitrile or And copolymers.
Specific examples of the polyvinyl ether-based adhesive include polyvinyl ether and polyvinyl isobutyl ether. Specific examples of the silicone resin-based adhesive include dimethylpolysiloxane. Examples of heat-sensitive adhesives include polyethylene, ethylene-vinyl acetate resin,
Examples include polyester-based, urethane resin-based, and synthetic rubber-based. One type of adhesive may be used alone, or two or more types may be used in combination. Further, a tackifier, a filler, a softener, a wax, an antioxidant, an ultraviolet absorber, a crosslinking agent, and the like may be added to the adhesive layer as needed.

The ink receiving layer provided on the base film is
Usually, a polymer containing a water-soluble polymer or an organic solvent-soluble polymer as a main component is preferable. Examples of the water-soluble polymer include starch, gelatin, casein, gum arabic, sodium alginate, carboxymethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone, and sodium polyacrylate. Examples of the organic solvent-soluble resin include synthetic rubber latex, polyvinyl butyral, and polyvinyl chloride. Examples of the constitution of the ink receiving layer are described in JP-A-61-228984, JP-B4-1706, JP-B6-699753, and JP-B-6-697.
No. 54, and the like.

The surface of the ink receiving layer is preferably roughened. When the surface is roughened, the contact angle of the ink becomes smaller, the ink adhesion becomes better, and the ink dries faster. For the purpose of surface roughening, fine particles, particularly porous fine particles, may be contained in the ink receiving layer. As the fine particles, for example, silica, clay, talc,
Diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, titanium oxide, lithobon, inorganic particles such as titanium white, and organic particles composed of protein particles and hydrophilic polymers. Can be The average particle size of the fine particles is preferably 0.001 to 50 μm. When such fine particles are contained, the polymer functions as a binder.
In the present invention, since the ink receiving layer is sealed between the base film and the base, not only can the ink be prevented from deteriorating,
It is possible to prevent the ink receiving layer, which is easily contaminated by the surface roughening, from being contaminated.

In the ink receiving layer, if necessary, a dispersant,
Leveling agents, antioxidants, ultraviolet absorbers, lubricants, defoamers and the like may be added. The thickness of the ink receiving layer is usually 3 to 100 μm, preferably 5 to 30 μm.
μm.

The specific structure of the photocatalyst layer is not particularly limited.
What is necessary is just to contain a photocatalyst at least. A photocatalyst is a substance that exhibits a photocatalytic function by irradiation with light having energy equal to or greater than its band gap, such as a metal compound semiconductor such as titanium oxide, zinc oxide, tungsten oxide, iron oxide, and strontium titanate. In the present invention, at least one of these may be used. Among these, it is preferable to use titanium oxide because of its excellent durability, high catalytic activity, and harmlessness. Also, for the purpose of photocatalytic function, vanadium,
Metals or metal compounds such as copper, palladium, silver, platinum and gold may be added. Further, an adsorbent may be added to the photocatalyst layer for the purpose of adsorbing nitrogen oxides and the like. As the adsorbent, for example, a carbon-based adsorbent such as activated carbon, a zeolite-based adsorbent, a molecular sieve, a metal oxide-based adsorbent, and a chelate resin may be used.

The method for forming the photocatalyst layer is not particularly limited. For example, any method such as a method of applying or transferring a paint containing photocatalyst particles, a binder and a solvent, and a vapor phase growth method such as sputtering or vapor deposition may be used. . The binder used for the coating material may be any of water glass, colloidal silica, polyorganosiloxane, aluminum phosphate, fluorine-based polymer, silicon-based polymer, and acrylic-based polymer. Then, after the coating film is formed, heat curing or UV curing may be performed as needed.

The thickness of the photocatalyst layer may be appropriately determined according to the type of the photocatalyst to be used, the forming method, and the like, but is usually selected from the range of 0.05 to 10 μm.

The present invention can be applied to road signs such as guide signs, instruction signs, regulation signs, and warning signs, and other guide signs, for example, bus stop guide signs and various destination display boards.
It can be applied to advertising signs and display boards.

[0029]

EXAMPLE 1 A sign sheet having an ink receiving layer and an adhesive layer on one side of a base film and a photocatalyst layer on the other side was prepared by the following procedure.

As the base film, a polyethylene terephthalate film (HB3 manufactured by Teijin Limited, thickness: 100 μm) into which an ultraviolet absorber was kneaded was used.

After a silicone resin is applied on the base film, 5 parts by weight of a binder, 5 parts by weight of a pigment and 8 parts of water
An ink receiving layer was formed by applying a coating liquid of 0 parts by weight using a knife coater. A urethane resin (Paterracol IJ-2 manufactured by Dainippon Ink and Chemicals, Inc.) was used as the binder, and amorphous silica (Fine Seal X-45 manufactured by Tokuyama Corporation, average particle size 5 μm) was used as the pigment. ) Was used.

Next, a negative image indicated by an arrow was printed on the ink receiving layer using an ink-jet printer using a light-transmitting blue ink.

The adhesive layer was formed by applying an acrylic pressure-sensitive adhesive (KH637 manufactured by Konishi Co., Ltd.) to a thickness of 15 μm on the printed surface of the sign.

The photocatalyst layer was formed on a protective layer provided on the surface of the base film. This protective layer is coated with a primer coating solution (Primer B manufactured by Taki Kagaku Co., Ltd.) in 0.1 g.
It was formed by applying it to a thickness of 1 μm and heat-treating it at 80 ° C. for 15 minutes. The photocatalytic layer is made of an anatase-type titanium oxide coating solution (CZP-22 manufactured by Taki Chemical Co., Ltd.).
1) was applied to a thickness of 0.1 μm and formed by heat treatment at 120 ° C. for 15 minutes.

Next, this sign sheet was adhered to the surface of the substrate with the above-mentioned adhesive layer, and the sign of the present invention was obtained. In addition, a white capsule lens type retroreflective sheet was previously adhered to the substrate surface. Therefore, in this sign, the figure (arrow) is white and the ground is blue.

Comparative Example 1 Screen printing was performed on a white capsule lens type retroreflective sheet using blue translucent ink.
Thus, a marking sheet having the same pattern as described above was obtained. The other side of the sign sheet opposite to the sign printed surface was affixed to a substrate to provide a sign.

Comparative Example 2 An acrylic pressure-sensitive adhesive (KH637 manufactured by Konishi Co., Ltd.) was applied to the printed surface of the sign of Comparative Example 1 to a thickness of 15 μm, and then a protective film made of polyvinyl fluoride was applied. A Tedlar TUT20BG3 manufactured by DuPont was affixed.

Each sign produced in Example 1, Comparative Example 1 and Comparative Example 2 was installed outdoors near a road, and the time-dependent change in the contamination on the sign surface was examined over a period of 6 months. Table 1 shows the results.

[0039]

[Table 1]

From Table 1, the effect of the present invention is clear.
Further, when the fading of the sign by the outdoor exposure was examined for each of the signs of Example 1 and Comparative Example 1, the fading of the sign of Example 1 was not recognized even after 6 months.
In the label of Comparative Example 1, fading was observed.

Comparative Example 3 An arrow-shaped marking sheet was adhered to a blue capsule lens type retroreflective sheet by thermocompression bonding to obtain a sign sheet having the same pattern as in Example 1. The opposite side of the marking sheet to the marking sheet was affixed to a substrate to provide a sign. In addition, the marking sheet was produced by cutting out a white capsule lens type retroreflective sheet in an arrow shape.

When this marker was placed outdoors and its time-dependent change was examined, a part of the marking sheet was peeled off after 6 months. In addition, the retroreflective sheet was damaged during thermocompression bonding, and as a result, the capsule was damaged by exposure to the outdoors, and water penetrated into the capsule, resulting in a decrease in luminance.

Comparative Example 4 A marker was produced in the same manner as in Comparative Example 3 except that an arrow-shaped marking sheet was made of a glass bead-dispersed retroreflective sheet having a lower reflexivity and a lower luminance than the capsule lens type. did.

When an outdoor installation test was performed on this marker in the same manner as in Comparative Example 3, the contrast was low due to poor light reflexivity at the arrow, and a part of the marking sheet was observed after 6 months. Was.

[0045]

According to the sign of the present invention, signs such as letters, symbols, and designs are sealed between the base film and the base, so that the sign is degraded by sunlight, particularly ultraviolet rays, and contaminants in the air. Deterioration can be prevented. In addition, since a sign is printed on the base film side instead of the substrate surface, an adhesive layer is formed on the sign and attached to the base, so that air bubbles are mixed between the base film and the base, Wrinkles can be prevented.

In the present invention, if a photocatalyst layer is provided on the display sheet in contact with the outside air, the visibility can be prevented from lowering due to contamination, and the burden of maintenance work such as cleaning and replacement can be reduced. Can be.

In the present invention, if an ink receiving layer is provided on the base film and printing of the sign is performed by an ink jet method, the cost increases when manufacturing a guide sign or the like that requires the manufacture of a small lot. Can be avoided and productivity is improved.

[0048]

[Brief description of the drawings]

1 (a) to 1 (c) are side views showing a configuration example of a sign of the present invention.

FIGS. 2A to 2C are side views showing a configuration example of the sign of the present invention.

[Explanation of symbols]

 2 Substrate 3 Base film 4 Mark 5 Adhesive layer 6 UV absorbing layer 7 Ink receiving layer 8 Photocatalytic layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D064 BA01 CA02 CA03 CA04 DA05 DA06 EA01 EB14 EB15 EB22 EB35 HA12 4J004 AA04 AA05 AA08 AA10 AA11 AA14 AB01 CA04 CA05 CA06 CC03 CC04 CD01 CD03 CD05 FA01

Claims (10)

[Claims] 1. A sign sheet for observing a sign printed on one surface of a light-transmitting base film from the other surface, the sign sheet having an adhesive layer on the sign. 2. The sign sheet according to claim 1, further comprising an ink receiving layer on said one side of the base film, and a sign printed on the ink receiving layer. 3. The marking sheet according to claim 1, further comprising a photocatalyst layer containing a photocatalyst on the other surface of the base film. 4. The photocatalyst comprises titanium oxide.
Sign sheet. 5. A sign having a substrate to which the sign sheet according to claim 1 is adhered by said adhesive layer. 6. The sign according to claim 5, wherein the surface of the substrate to which the sign sheet is attached has a retroreflective property. 7. The sign according to claim 5, wherein the surface of the substrate to which the sign sheet is attached has light transmissivity, and the sign sheet is irradiated with light through the sign sheet attachment surface. 8. The sign according to claim 7, wherein the surface of the substrate to which the sign sheet is attached has a light diffusing property. 9. The light source according to claim 7, wherein the light source is accommodated in the base.
Or 8 signs. 10. The sign according to claim 5, further comprising a light source for irradiating the sticking surface through the sign sheet.