JP6642752B2 - sticker - Google Patents

Description

The present invention relates to seals. More specifically, the seal portion at the time of use is a seal composed of only an adhesive layer and a printing ink layer without substantially containing a base material, and relates to a seal that can be repeatedly attached to and detached from an adherend. In particular, the present invention is characterized in that the design of the seal pattern is improved.

Conventionally, various types of seals have been manufactured and used, but generally have a configuration in which a pattern is printed on a base material such as paper or plastic. In a conventional seal, a pressure-sensitive adhesive layer is provided on the back surface of a base material, and a seal composed of the base material and a pattern is attached to an adherend with the pressure-sensitive adhesive.
Therefore, there are not many examples of seals comprising only a pressure-sensitive adhesive layer and a printing ink layer without substantially containing a base material when used as a seal.

Conventionally, as a method of manufacturing a relatively thick seal, a pattern of the seal is printed on a predetermined base material surface, and a release paper is applied to an adhesive-coated surface of a sheet in which an adhesive is entirely coated on the back surface of the base material. Is a method of manufacturing a seal by laminating and removing the base material around the surface pattern with a standard cutting blade, and then raising the cake (removing unnecessary base material around the unnecessary die cutting). It is.
In the case of such a seal, when the shape of the seal is various and not constant, it is necessary to manufacture the punching blade in accordance with the shape, and there is a problem that the cost increases. Therefore, a seal that does not use a punching blade is being studied.

Patent Literature 1 describes a decorative seal in which an adhesive layer and a base layer are applied on a release sheet by screen printing, and a printing layer is printed by inkjet. It also describes that an overcoat layer is applied on the printing layer. However, it is considered that a sufficient thickness of the seal cannot be obtained by the inkjet printing, and the function of the seal of the present invention cannot be provided.
The method of manufacturing a seal described in Patent Document 2 is a manufacturing method in which a seal is punched into a fixed shape by a punching blade. When this manufacturing method is used, a punching step is required, and there is a disadvantage that a punching blade must be manufactured for each shape to be punched.

JP 2014-50966 A JP 2011-215335 A

A seal in which the seal portion at the time of use does not substantially include the base material but includes only the pressure-sensitive adhesive layer and the printing ink layer forms the pressure-sensitive adhesive layer on a release substrate that is a mount, and The picture is printed.
However, it is difficult to print a pattern directly on the pressure-sensitive adhesive layer, so a transparent medium printing layer (transparent silk screen ink printing layer), which is the base of the pattern printing, is formed on the pressure-sensitive adhesive layer, and offset printing is performed on it. The pattern is printed by the law.

However, at the time of this pattern printing, if a medium printing layer (transparent silk screen ink printing layer) is formed after drying by using a volatile drying type adhesive as a base, the pressure-sensitive adhesive layer is removed from the peelable substrate. Since the adhesive force (tack force) is reduced, the adhesive layer previously formed on the base material having releasability and the medium printing layer are overlapped with each other and taken up by a blanket cylinder of an offset printing machine. Problems arise. In such a case, the pattern printing by the offset printing cannot be performed smoothly. An object of the present invention is to obtain a seal that can solve such a problem.

The gist of the present invention that solves the above-mentioned problems is that, on a substrate having releasability, a pressure-sensitive adhesive layer, a transparent silk-screen ink printing layer, a pattern printing layer, and a sealing portion composed of a transparent silk-screen overprint layer are laminated in this order. Wherein the pressure-sensitive adhesive layer is a layer obtained by adding a UV-curable pressure-sensitive adhesive to a volatile dry-type pressure-sensitive adhesive at a mass ratio of 30 to 45% based on the total pressure-sensitive adhesive amount, The seal is characterized in that the seal portion is used after being peeled from the substrate having the peelability.

In the above-mentioned seal, the volatile and dry type adhesive of the adhesive layer is cured, and the ultraviolet-curable adhesive can be in an uncured state.

Further, the thickness of the seal portion may be 150 to 250 μm, and the thickness of the pressure-sensitive adhesive layer may be 20 to 30 μm. It is also preferable that the transparent silk screen ink printing layer has a size expanded by a width of at least 0.3 to 0.5 mm from the outer edge of the pressure-sensitive adhesive layer.

Since the seal of the present invention uses silk screen printing in many cases, the thickness of the seal can be increased, and a seal portion that can be repeatedly attached and detached without a base material can be obtained.
In the seal of the present invention, it is not necessary to punch out the seal portion with a blade, and a thick re-peelable seal portion can be obtained. In addition, the manufacturing process can be performed smoothly, and the manufacturing cost can be reduced.

Further, the seal of the present invention does not cause a phenomenon that the upper portion of the pressure-sensitive adhesive layer is peeled off from the releasable base material at the time of pattern printing by offset printing at the time of manufacturing and is taken up by the blanket cylinder. Therefore, pattern printing by offset printing can be performed smoothly.

It is sectional drawing which shows the seal | sticker of this invention. It is a perspective view in the state where a seal part was stuck on an adherend. It is a figure explaining a manufacturing process of a seal. It is a figure explaining a silk screen version. It is a figure explaining the situation of the trouble which tends to occur in the picture printing process of the seal.

The seal of the present invention will be described.
FIG. 1 is a sectional view showing the seal of the present invention.
As shown in FIG. 1, a seal 1 of the present invention has a seal portion 2 formed on a peelable base material (seal mount) 10.
The portion between the pressure-sensitive adhesive layer 11 and the transparent silk screen overprint layer 14 except for the base material 10 having a peeling property corresponds to the seal portion 2. Since the substrate 10 is peelable, the pressure-sensitive adhesive layer 11 of the seal portion 2 can be peeled from the substrate 10. Only the seal part 2 is used as a seal to be adhered to the adherend. Normally, the thickness of the seal portion 2 excluding the base material 10 having releasability is set to 180 to 250 μm.

The thickness of the seal portion 2 is preferably formed to the above-mentioned thickness from the viewpoint of ensuring the repeated sticking and peeling properties of the seal portion 2. The thickness of the pressure-sensitive adhesive layer 11 is preferably 20 to 30 μm from the viewpoint of protection of the seal portion 2. The picture printing layer 13 is sized to fit within the shapes of the transparent silk screen ink printing layer 12 and the transparent silk screen overprint layer 14. This is for the purpose of protecting the picture printing layer 13.

The transparent silk screen ink print layer 12 is formed in a size that defines the outline of the seal portion 2. Although the outer shape of the transparent silk screen ink printing layer 12 and the outer shape of the adhesive layer 11 can be substantially similar to each other, the transparent silk screen ink printing layer 12 has at least a width H larger than the outer edge of the adhesive layer 11 as shown in FIG. (About 0.3 to 0.5 mm).
When the transparent silk screen ink printing layer 12 has a larger area than the pressure-sensitive adhesive layer 11, the transparent silk screen ink printing layer 12 is easily peeled off from the base material 10, and is easily peeled off when the seal portion 2 once adhered to the adherend is again peeled off. Because it becomes. Further, if the area of the pressure-sensitive adhesive layer 11 is larger, there is a portion where the pressure-sensitive adhesive comes out on the surface, which may cause a problem in another process.

FIG. 2 is a perspective view showing a state in which the seal portion is attached to an adherend.
As shown in FIG. 2, when the seal portion 2 is adhered to the inner surface of the transparent adherend 20 by the adhesive layer 11, the pattern print layer 13 can be visually recognized from the inner surface side. Since the picture print layer 13 is viewed through the transparent silk screen overprint layer 14, the transparent silk screen overprint layer 14 needs to have high transparency.
When there is no opaque layer in the picture printing layer 13, the picture printing layer 13 can be visually recognized from the outer surface side of the transparent adherend 20. In many cases, the pattern from the outer surface is symmetrical to that when viewed from the inner side, but the pattern is not necessarily symmetrical depending on how the pattern inks overlap.
When a concealing layer such as white is included in the pattern printing layer 13, it is obvious that even if the concealing layer is put on a transparent adherend, the pattern printing layer 13 is not visible from the opposite side because it is shielded by the concealing layer. .

The total thickness of the seal portion 2 is preferably 150 μm or more in order to make it the same thickness as a general seal with a paper base material. Since the pattern printing layer 13 has many delicate patterns, an offset printing method is employed. For offset printing, an ultraviolet curable ink may be used.

The transmission density of the portion where the pressure-sensitive adhesive layer 11 and the transparent silk screen ink printing layer 12 are laminated is preferably 0.05 or less. In addition, the transmission density of the portion where the three layers of the adhesive layer 11, the transparent silk screen ink printing layer 12, and the transparent silk screen overprint layer 14 are laminated (not including the pattern printing layer 13) is less than 0.1. Is preferred. This is because the purpose of clearly seeing the picture and the parts other than the picture are preferably inconspicuous.

Next, the production of the seal of the present invention will be described in detail with reference to the drawings.
FIG. 3 is a view for explaining a manufacturing process of the seal of the present invention.
As shown in FIG. 3A, first, a seal is manufactured by applying a transparent adhesive in a predetermined shape on a base material (seal backing) 10 having releasability by a silk screen printing method. To form The pressure-sensitive adhesive layer 11 is used to adhere the seal portion to the adherend when the seal is completed, and a weakly-adhesive pressure-sensitive adhesive is used so that the seal portion can be re-peeled after being adhered. The term “predetermined shape” means that the shape is not applied to the entire surface but is adjusted to the shape of each picture of the seal. One or more portions are formed in accordance with the number of seal portions formed on the surface of the base material 10.

In the production of the seal of the present invention, in applying the above-mentioned adhesive, an adhesive obtained by adding an ultraviolet curing adhesive (hereinafter, also referred to as a UV curing adhesive) to a volatile drying adhesive is used. And Another feature is that the UV-curable pressure-sensitive adhesive is not cured by ultraviolet irradiation immediately after the application of the pressure-sensitive adhesive. However, since normal drying with hot air or an infrared heater is performed after the application, a drying effect is produced for the volatile drying type pressure-sensitive adhesive.
3 (A) to 3 (D), the pressure-sensitive adhesive layer 11 schematically shows that a volatile and dry-type pressure-sensitive adhesive 11k and a UV-curable pressure-sensitive adhesive 11u are mixed and used. This does not mean that the agent 11u is dispersed as spherical particles. A portion where the UV curable pressure-sensitive adhesive 11u is a black circle indicates an uncured state, and a portion where the UV curable adhesive 11u is a white circle indicates a cured state.

A transparent silk screen medium ink is printed on the adhesive layer 11 to form a transparent silk screen ink printing layer 12. It is convenient to print the transparent silk screen ink printing layer 12 with a larger area than the pressure-sensitive adhesive layer 11 when removing the seal portion again.
In the present invention, the term “transparent” means that when a picture is viewed through the pressure-sensitive adhesive layer 11, the silk screen ink print layer 12, or the transparent silk screen overprint layer 14 described later, the picture is visually recognized without losing sharpness. It means that it is only necessary to be as transparent as possible.
Further, the medium ink is usually an ink composed of a transparent vehicle and an extender pigment.

Next, as shown in FIG. 3B, a pattern printing layer 13 which is a seal pattern is formed on the transparent silk screen ink printing layer 12 by an offset printing method.
The pattern printing layer 13 is printed via the transparent silk screen ink printing layer 12 because the pressure-sensitive adhesive layer 11 remains sticky, so that it sticks to the blanket cylinder and cannot be printed directly by the offset printing method. The picture is usually printed in a plurality of colors.

Subsequently, as shown in FIG. 3C, a transparent silk screen overprint layer 14 which is a protective layer of the seal is printed on the pattern print layer 13 by a medium ink using a silk screen printing method. In order to increase the thickness, overprint printing may be performed a plurality of times.
As described above, the silk screen printing method is frequently used for manufacturing a seal for the purpose of increasing the thickness of the seal. In offset printing, a thickness of less than 1 μm can be obtained by one printing, but in silk screen printing, a thickness of several μm or more can be obtained by one printing.

Finally, the adhesive layer 11 is irradiated with ultraviolet rays to cure the UV-curable adhesive 11u.
In FIG. 3 (D), the change of the UV curable pressure-sensitive adhesive 11u to a white circle means that the UV curable pressure-sensitive adhesive has been cured by irradiation with ultraviolet light.

Here, the silk screen version will be described.
FIG. 4 is a diagram illustrating a silk screen version. The screen of the silk screen plate 25 is incorporated in the strong mold 23 and held in a flat state. The photosensitive resin film is not formed on the central portion 21 serving as a pattern so that the ink can pass through the screen mesh, and the photosensitive resin film is formed on the portion 22 other than the portion serving as the pattern.
In this state, if the silk screen ink is extruded by sliding the squeegee, the ink of the portion 21 serving as a pattern adheres to the printing medium. The screen is made of polyester or stainless steel and has a mesh of about 60 to 200 mesh.

First, at the time of pattern printing, when completely dried using a volatile drying type pressure-sensitive adhesive and then performing pattern printing by offset, the adhesive force (tack force) of the pressure-sensitive adhesive layer to the peelable substrate is reduced. For this reason, it has been described that a problem occurs in which the adhesive layer previously formed on the base material having releasability and the transparent silk screen ink printing layer are taken off by a blanket cylinder of an offset printing machine in a state where the layers are overlapped. This phenomenon will be described with reference to the drawings.

FIG. 5 is a diagram for explaining a situation of a trouble that is likely to occur in a sticker pattern printing process.
In offset printing, the blanket cylinder once receives ink transferred from an ink supply roll to a printing plate, and prints the ink on a printing medium. The blanket cylinder is an impression cylinder on which a smooth rubber blanket is wound.
As shown in FIG. 5A, it is normal that the picture ink 3 transferred to the blanket cylinder 30 is transferred and printed on the transparent silk screen ink printing layer 12.
However, when the adhesive force (tack force) of the adhesive layer 11 is reduced, as shown in FIG. 5B, the transparent silk screen ink printing layer 12 and the adhesive layer 11 are applied to the pattern ink 3 on the blanket cylinder. The blanket cylinder 30 is taken off in a state of overlapping and adhering. In such a state, smooth offset picture printing becomes impossible.

Generally, a volatile-drying-type pressure-sensitive adhesive is used as the pressure-sensitive adhesive, and the solvent is volatilized and dried using hot air or an infrared heater before the transparent silk screen ink printing layer 12 is formed. Although the adhesive has a residual solvent even when the solvent is volatilized to some extent, the adhesive has an inherent adhesive strength. However, since the base material 10 is peelable, the adhesive strength between the base material 10 and the adhesive layer 11 is a general paper. It is significantly lower than in the case of the substrate. Accordingly, the adhesive force between the blanket cylinder 30 and the offset ink 3 or between the ink 3 and the transparent silk screen ink printing layer 12 is smaller than the adhesive force between the peelable substrate (seal board) 10 and the adhesive layer 11. When it becomes larger, a phenomenon as shown in FIG. 5B occurs.

On the other hand, a UV-curable pressure-sensitive adhesive may be used alone as the pressure-sensitive adhesive. The UV-curable pressure-sensitive adhesive is a type of active energy ray-curable adhesive, and undergoes a phase change from a liquid to a solid phase by a chain photopolymerization reaction when irradiated with ultraviolet rays. Unlike the volatile dry adhesive, the UV-curable adhesive uses a monomer instead of an organic solvent. When using with a low viscosity such as gravure ink, a general organic solvent is used in combination as a diluting solvent.However, when using with a relatively high viscosity such as a silk screen ink, the viscosity can be almost adjusted only with the monomer. Become. A photopolymerization initiator may be added as a sensitizer.

Since the UV-curable pressure-sensitive adhesive has a high adhesive strength when not cured, the UV-curable pressure-sensitive adhesive is cured by irradiating ultraviolet rays before printing the transparent silk screen ink printing layer 12. Since it is instantaneously cured by ultraviolet irradiation, it is generally difficult to reproduce an intermediate state before and after curing.
Therefore, in the method for manufacturing a seal of the present invention, an adhesive obtained by adding an appropriate amount of a UV-curable adhesive to a volatile dry adhesive is used. After applying the pressure-sensitive adhesive, drying with a normal hot air or an infrared heater is performed to dry the volatile drying type pressure-sensitive adhesive. It is intended to obtain a strong adhesive state.
Of course, after the seal is completed, the curing is promoted by irradiating with ultraviolet rays, but it is also possible to irradiate with ultraviolet rays immediately before shipping.

<Embodiment relating to material>
Various materials used in the present invention will be described.
(1) Release Paper Substrate and Release Agent Release paper substrate 10 can be used as long as it has sufficient strength. For example, high-quality paper, kraft paper, glassine paper, rayon paper, coated paper, synthetic paper Paper, paper laminated with a resin film, and the like can be suitably used. A release agent can be applied to the surface of the base material that is in contact with the pressure-sensitive adhesive layer 11 and used.
As the release agent for forming the release layer, a release agent obtained by adding a silicone oil to an ultraviolet-curable medium ink or a release agent obtained by adding a silicone acrylate is used. Ordinary thermosetting release inks can also be used. Examples of the printing method of the release agent include offset, flexo, and gravure printing.

(2) Volatile dry type pressure-sensitive adhesive A pressure-sensitive adhesive having a pressure-sensitive adhesive action, which can be widely used for forming the pressure-sensitive adhesive layer 11.
As the weak tacky adhesive, those comprising a rubber such as NR, SBR, IR, and CR and a solvent are mainly used, but an emulsion acrylic adhesive can also be used. In addition, there are a silicon type and a polyvinyl ether type, but any type can be used. Generally, an organic solvent is used as the solvent.

(3) UV-curable pressure-sensitive adhesive UV-curable pressure-sensitive adhesive is a kind of active energy ray-curable pressure-sensitive adhesive, and changes phase from liquid to solid by irradiation with ultraviolet light, by a chain photopolymerization reaction. . As the resin, a prepolymer having a double bond is used, and resins such as polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, polyether (meth) acrylate, and polyol (meth) acrylate are used. Is done.
As the monomer, a monomer having an epoxy group such as bisphenol A type epoxy and alicyclic epoxy serves as a diluting solvent and also serves as a crosslinking agent.
Usually, the adhesive loses its tackiness after light curing, but when used for the present seal, a material which is not completely cured but is designed to maintain tackiness after curing is used.

(4) Solvent-type silk screen inks use various polymer resins (molecular weight 10,000 to hundreds of thousands) such as cellulose, polyvinyl chloride and acrylic, and organic solvents (boiling point 120 to 220 ° C). ) Is used as diluent.
For the ultraviolet curing type, a prepolymer having a double bond (molecular weight: 500 to 5,000) is used. As the diluent, a monomer having a double bond is used.
Auxiliary agents such as an antifoaming agent, a wax, a leveling agent, and a lubricant are added. In the case of coloring, a coloring material such as a pigment is added.

(Example 1)
The seal 1 was manufactured by using a base material (thickness: 250 μm) obtained by coating a high-quality paper with a silicon-based release agent as the base material 10 having releasability.
As a pressure-sensitive adhesive, a solvent-soluble, volatile and dry acrylic pressure-sensitive adhesive (dipropylene glycol diacrylate, trade name: SR508, manufactured by Sartomer Co., Ltd.) was used, and a UV-curable pressure-sensitive adhesive (Recure 4700VX, manufactured by Jujo Chemical Co., Ltd.) was added thereto. And applied in a predetermined shape by a silk screen printing method. The ratio of the volatile dry type acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was adjusted to 100: 82 in terms of the mass ratio of the ink. A 200-mesh polyester screen was used for applying the adhesive.
Drying was performed by hot air and an infrared heater, but the drying was not performed by irradiation with ultraviolet rays, and the following process was performed. In addition, the thickness of the pressure-sensitive adhesive layer 11 after drying was 20 to 25 μm.

The transparent silk screen ink printing layer 12 was printed on the surface of the pressure-sensitive adhesive layer 11 using an acrylic ester-based silk screen medium ink. For printing of the printing layer 12, a 60 mesh stainless screen was used. The thickness after drying (the thickness including the pressure-sensitive adhesive layer 11 and the transparent silk screen ink printing layer 12) was 60 to 80 μm.

On the dried transparent silk screen ink printing layer 12 after drying, a pattern was printed by an offset printing method using a normal offset ink that was not UV-curable to form a pattern printing layer 13. The thickness of the pattern printing layer 13 was 1 μm or less.
The transparent silk screen overprint layer 14 was printed twice on the picture print layer 13 using an acrylic ester-based silk screen medium ink. The total thickness of the transparent silk screen overprint layer 14 was set to be about 70 to 90 μm. The transparent silk screen overprint layer 14 was printed using a 60 mesh polyester screen. Finally, ultraviolet light was irradiated by a UV lamp to cure the UV-curable pressure-sensitive adhesive to reduce the viscosity. The overall thickness of the seal portion 2 was 130 to 170 μm.

(Example 2)
Using the same peelable substrate 10 as in Example 1, using the same adhesive and the same printing ink, the seal 1 was manufactured under the same conditions.
However, the ratio of the volatile dry type acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was set to 100: 60 by mass ratio of the ink.
Drying was performed by hot air and an infrared heater, but the drying was not performed by irradiation with ultraviolet rays, and the following process was performed. In addition, the thickness of the pressure-sensitive adhesive layer 11 after drying was 20 to 25 μm.
The formation of the picture print layer 13 and the transparent silk screen overprint layer 14 was also performed under the same conditions as in Example 1. The overall thickness of the seal portion 2 was 130 to 170 μm.

(Example 3)
Using the same peelable substrate 10 as in Example 1, using the same adhesive and the same printing ink, the seal 1 was manufactured under the same conditions.
However, the ratio of the volatile dry type acrylic pressure-sensitive adhesive and the UV curable pressure-sensitive adhesive was set to 100: 42 in terms of the mass ratio of the ink.
Drying was performed by hot air and an infrared heater, but the drying was not performed by irradiation with ultraviolet rays, and the following process was performed. In addition, the thickness of the pressure-sensitive adhesive layer 11 after drying was 20 to 25 μm.
The formation of the picture print layer 13 and the transparent silk screen overprint layer 14 was also performed under the same conditions as in Example 1. The overall thickness of the seal portion 2 was 130 to 170 μm.

(Comparative Example 1)
Using the same peelable substrate 10 as in Example 1, using the same adhesive and the same printing ink, the seal 1 was manufactured under the same conditions.
However, the ratio of the volatile dry type acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was set to 100: 100 in mass ratio of the ink.
Drying was performed by hot air and an infrared heater, but the drying was not performed by irradiation with ultraviolet rays, and the following process was performed. In addition, the thickness of the pressure-sensitive adhesive layer 11 after drying was 20 to 25 μm.
The formation of the picture print layer 13 and the transparent silk screen overprint layer 14 was also performed under the same conditions as in Example 1. The overall thickness of the seal portion 2 was 130 to 170 μm.

(Comparative Example 2)
Using the same peelable substrate 10 as in Example 1, using the same adhesive and the same printing ink, the seal 1 was manufactured under the same conditions.
However, the ratio of the volatile dry type acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was set to 100: 20 by mass ratio of the ink.
Drying was performed by hot air and an infrared heater, but the drying was not performed by irradiation with ultraviolet rays, and the following process was performed. In addition, the thickness of the pressure-sensitive adhesive layer 11 after drying was 20 to 25 μm.
The formation of the picture print layer 13 and the transparent silk screen overprint layer 14 was also performed under the same conditions as in Example 1. The overall thickness of the seal portion 2 was 130 to 170 μm.

In the above Examples 1 to 3, in the pattern printing by the offset printing method, there is a problem that the adhesive layer 11 and the transparent silk screen ink printing layer 12 are taken on the blanket cylinder of the offset printing machine in a state where they are overlapped. However, in Comparative Example 2, since the amount of the ultraviolet-curable pressure-sensitive adhesive added was small, this problem occurred as in the case of the volatile and dry-type pressure-sensitive adhesive alone.
Further, in Comparative Example 1, when the transparent silk screen ink printing layer 12 was printed, the silk screen mesh adhered to the surface of the adhesive layer 11 so that the transparent silk screen was smooth because the amount of the ultraviolet curable adhesive added was too large. It was confirmed that printing of the ink print layer 12 could not be performed.
Table 1 shows the above results.

In Table 1 above, the ratio of the UV-curable pressure-sensitive adhesive is represented by [B / (A + B)] × 100 when the mass of the volatile and dry-type pressure-sensitive adhesive is A and the mass of the UV-curable pressure-sensitive adhesive is B. It is a numerical value to be calculated.
In the results, “good” means that the pressure-sensitive adhesive layer 11 and the transparent silk screen ink printing layer 12 are removed from the releasable substrate 10 by a blanket cylinder during pattern printing by offset, and that the silk screen is applied to the surface of the pressure-sensitive adhesive layer 11. This indicates that the phenomenon that the mesh was not adhered did not occur.
"Phenomenon of sticking to the mesh" indicates that a phenomenon occurs in which the silk screen mesh sticks to the surface of the pressure-sensitive adhesive layer 11 when the transparent silk screen ink printing layer 12 is printed.
"Phenomenon taken by the plate cylinder" means that a phenomenon occurs in which a pressure-sensitive adhesive layer 11 and a transparent silk screen ink printing layer 12 are taken on a blanket cylinder in a state where the adhesive layer 11 and the transparent silk screen ink printing layer 12 are overlapped from each other during pattern printing by offset. Show.
From the above results, it is recognized that the addition ratio (blending ratio) of the UV-curable pressure-sensitive adhesive in the total pressure-sensitive adhesive amount is preferably about 30 to 45%.

DESCRIPTION OF SYMBOLS 1 Seal 2 Seal part 3 Picture ink 10 Base material (seal board)
DESCRIPTION OF SYMBOLS 11 Adhesive layer 12 Transparent silk screen ink printing layer 13 Picture printing layer 14 Transparent silk screen overprint layer 20 Adherend 25 Silk screen plate 30 Blanket cylinder

Claims (5)

On a substrate having a releasable property, an adhesive layer, a transparent silk screen ink printing layer, a pattern printing layer, a seal portion composed of a transparent silk screen overprint layer, a seal laminated in this order, the adhesive, The layer comprises a layer obtained by adding a UV-curable pressure-sensitive adhesive to a volatile dry-type pressure-sensitive adhesive at a mass ratio of 30 to 45% based on the total amount of the pressure-sensitive adhesive, and wherein the seal portion has the above-mentioned releasable base material. A seal characterized by being used after being peeled off from a seal. The seal according to claim 1, wherein the volatile drying type adhesive of the adhesive layer is cured, and the ultraviolet curing type adhesive is in an uncured state. The seal according to claim 1, wherein a thickness of the seal portion is 150 to 250 μm. 3. The seal according to claim 1, wherein the pressure-sensitive adhesive layer has a thickness of 20 to 30 [mu] m. The seal according to claim 1, wherein the transparent silk screen ink printing layer has a size expanded by at least 0.3 to 0.5 mm from an outer edge of the pressure-sensitive adhesive layer.

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