JP2016200671A - Manufacturing method of sticker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a sticker that can be released from a base material having detachability and can be stuck without including a substantial base material layer in a sticker part.SOLUTION: The manufacturing method of the sticker in which the sticker part formed from an adhesive layer 11, a transparent silk screen ink print layer 12, a pattern print layer 13 by offset printing and a transparent silk screen overprint layer 14 is laminated in this order on a base material 10 having detachability includes: performing printing while adding an ultraviolet curable adhesive in 30 to 45 mass% to a vaporizing and drying adhesive during coating by silk screen printing of the adhesive layer 11; then successively performing printing of the transparent silk screen ink print layer 12, pattern printing by offset and printing of the transparent silk screen overprint layer 14 without performing irradiation with ultraviolet rays and in the state where the ultraviolet curable adhesive is non-cured; and then performing irradiation with ultraviolet rays to reduce viscosity of the adhesive layer.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a seal. Specifically, the seal part in use does not include a substantial base material, and is a seal composed of only an adhesive layer and a printing ink layer, and relates to a method for manufacturing a seal that can be repeatedly attached to and detached from an adherend. It is.
In particular, the improvement at the time of picture printing by the offset of the seal is aimed at.

Various types of seals have been manufactured and used in the past, 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 the base material, and a seal composed of the base material and a pattern is adhered to the adherend with the pressure-sensitive adhesive.
Therefore, when used as a seal, there are not many examples of seals that contain only a pressure-sensitive adhesive layer and a printing ink layer without containing a substantial base material.

Conventionally, as a method for producing a relatively thick seal, a release paper is applied to the adhesive-coated surface of a sheet in which a seal pattern is printed on a predetermined substrate surface and the adhesive is entirely coated on the back surface of the substrate. A method of manufacturing a seal by laminating the substrate, punching the substrate around the surface pattern with a standard cutting blade, and then lifting (removing unnecessary substrate around the unnecessary die cutting) It is.
In such a manufacturing method, when the shape of the seal is various and is not a fixed shape, it is necessary to manufacture the punching blade in accordance with the shape, resulting in a problem of high cost. Therefore, a method for manufacturing a seal that does not use a punching blade has been studied.

Patent Document 1 describes a decorative seal in which an adhesive layer and a base layer are coated on a release sheet by screen printing, and the printed layer is printed by inkjet. It also describes the application of an overcoat layer on the print layer. However, in ink jet printing, it is considered that a sufficient seal thickness cannot be obtained and the function of the seal of the present invention cannot be provided.
The manufacturing method of a seal described in Patent Document 2 is a manufacturing method in which a seal is punched into a fixed shape with a punching blade. When this manufacturing method is used, a punching process is required, and a punching blade needs to be produced for each shape to be punched.

JP 2014-50966 A JP 2011-215335 A

When the seal part in use does not contain a substantial base material, the seal is composed only of the pressure-sensitive adhesive layer and the printing ink layer. A pattern is printed on the agent layer.
However, since it is difficult to offset print directly on the adhesive layer, a transparent medium printing layer (transparent silk screen ink printing layer) is formed on the adhesive layer as the base of the pattern printing and offset on it. Pattern printing is performed by the printing method.

However, at the time of this pattern printing, if a medium printing layer (transparent silk screen ink printing layer) is formed after drying using a volatile drying type pressure-sensitive adhesive as the base, Since the adhesive strength (tacking force) is reduced, the adhesive layer previously formed on the peelable substrate and the medium printed layer are overlapped with each other and taken up by the blanket cylinder of the offset printing press. Problems arise. Then, the pattern printing by offset printing cannot be smoothly performed. An object of the present invention is to solve such problems.

The first of the gist of the present invention for solving the above-mentioned problems is a method for producing a seal having a seal part which is peeled from the base material and used on the base material having peelability, and (1) the base material A process of forming an adhesive layer having a predetermined shape by applying an adhesive obtained by adding an ultraviolet curable adhesive to a volatile drying adhesive on the surface by silk screen printing, (2) UV curable without ultraviolet irradiation A step of forming a transparent silk screen ink printing layer by printing a transparent silk screen medium ink on the pressure sensitive adhesive layer in an uncured state of the pressure sensitive adhesive layer, and (3) an offset printing method on the transparent silk screen ink printing layer. (4) forming a transparent silk screen overprint layer by printing a transparent silk screen medium ink on the pattern printing layer; Method for producing a seal, characterized in that it comprises steps, a to by irradiating ultraviolet rays to the destination agent layer reduces the adhesion, in.

The second of the gist of the present invention for solving the above problems is a seal comprising an adhesive layer, a transparent silk screen ink printing layer, a pattern printing layer by offset printing, and a transparent silk screen overprint layer on a substrate having peelability. In the manufacturing method of the seal in which the parts are laminated in this order, for the application of the adhesive layer by the silk screen printing method, an ultraviolet curable adhesive is applied to the volatile drying adhesive in a ratio to the total adhesive amount. After adding and printing at a mass ratio of 30 to 45%, UV irradiation is not performed and the UV curable adhesive is uncured, and the transparent silk screen ink printing layer is formed and the pattern printing layer is formed by the offset printing method. Forming a transparent silk screen overprint layer in order and then irradiating with ultraviolet rays to reduce the adhesiveness of the adhesive layer. Method for producing a seal with, in.

In said manufacturing method, the thickness of the said seal part can be formed in 150-250 micrometers, and the thickness of the said adhesive layer can also be formed in 20-30 micrometers. Further, the transparent silk screen ink printing layer is printed so as to be substantially similar to the outer shape of the pressure-sensitive adhesive layer, and the transparent silk screen ink printing layer is at least 0.3 to 0.5 mm from the outer edge of the pressure-sensitive adhesive layer. It is also preferable to form in a size expanded by a width of.

According to the method for producing a seal of the present invention, an ultraviolet curable adhesive is added to a volatile dry adhesive for forming an adhesive layer, and the ultraviolet curable adhesive is used in an uncured state. , Since transparent silk screen medium ink printing, which is the subsequent process, and pattern printing by offset printing are performed, the adhesive force between the adhesive layer and the peelable substrate is kept high, and from the peelable substrate during pattern printing by offset printing The phenomenon that the upper part peels off from the pressure-sensitive adhesive layer and is taken by the blanket cylinder does not occur. Therefore, pattern printing by offset printing can be performed smoothly.

In the method for producing a seal of the present invention, it is not necessary to punch out the seal portion with a blade mold, and a thick removable seal portion is obtained. Further, the manufacturing process can be made smooth and the manufacturing cost can be reduced.

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

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram for explaining a manufacturing process of a seal according to the manufacturing method of the present invention.
As shown in FIG. 1A, a seal is manufactured by first applying a transparent adhesive in a predetermined shape on a base material (seal mount) 10 having peelability by a silk screen printing method. Form. The pressure-sensitive adhesive layer 11 is used for sticking the seal portion to the adherend when the seal is completed, but a weak-tacky pressure-sensitive adhesive is used so that it can be peeled again after being stuck. The term “predetermined shape” means that the shape is not applied to the entire surface but according to the individual pattern of the seal. One or a plurality of locations are formed in accordance with the number of seal portions formed on the surface of the substrate 10.

In the method for producing a seal of the present invention, in the application of the above-mentioned adhesive, an adhesive obtained by adding an ultraviolet curable adhesive (hereinafter also referred to as a UV curable adhesive) to the volatile dry adhesive is used. Features. It is also characterized in that the UV curable adhesive is not cured by ultraviolet irradiation immediately after the application of the adhesive. However, since normal drying with hot air or an infrared heater is performed after application, a drying effect is produced for the volatile drying type adhesive.
1 (A) to 1 (D), the pressure-sensitive adhesive layer 11 schematically shows that a volatile drying-type pressure-sensitive adhesive 11k and a UV-curable pressure-sensitive adhesive 11u are used in combination. It does not mean that the agent 11u is dispersed as spherical particles. The portion where the UV curable pressure-sensitive adhesive 11u is a black circle is in an uncured state, and the portion which is a white circle is in a cured state.

A transparent silk screen ink is printed on the pressure-sensitive adhesive layer 11 to form a transparent silk screen ink printing layer 12. When the transparent silk screen ink printing layer 12 is printed in a larger area than the pressure-sensitive adhesive layer 11, it is convenient when the seal part is peeled off again.
In the present invention, the term “transparent” means that the pattern is visible without losing clarity when the pattern is viewed through the pressure-sensitive adhesive layer 11, the silk screen ink printing layer 12, or the transparent silk screen overprint layer 14 described later. It means that it should be transparent as much as possible.
The medium ink is usually an ink composed of a transparent vehicle and an extender pigment.

Next, as shown in FIG. 1B, a pattern printing layer 13 that 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, and therefore sticks to the blanket cylinder and cannot be printed directly by the offset printing method. The pattern is usually printed in multiple colors.

Subsequently, as shown in FIG. 1C, a transparent silk screen overprint layer 14 which is a protective layer of a seal is printed on the pattern print layer 13 by a medium ink by 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 the seal because of the purpose of increasing the thickness of the seal. In offset printing, only a thickness of less than 1 μm can be obtained by one printing, whereas in silk screen printing, a thickness of several μm or more can be obtained by one printing.

Finally, the UV curable pressure-sensitive adhesive 11u is cured by irradiating the pressure-sensitive adhesive layer 11 with ultraviolet rays.
In FIG. 1D, the fact that the UV curable adhesive 11u is changed to a white circle means that it is cured by ultraviolet irradiation.

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

First, when printing a pattern, the adhesive strength (tacking force) of the pressure-sensitive adhesive layer to the peelable substrate decreases when the pattern is printed by offsetting after completely drying using a volatile dry adhesive. For this reason, it has been explained that a problem arises in that the adhesive layer and the transparent silk screen ink printing layer, which are formed in advance on the substrate having peelability, are taken up by the blanket cylinder of the offset printing press. This phenomenon will be described with reference to the drawings.

FIG. 5 is a diagram for explaining a situation of trouble that is likely to occur in the seal picture printing process.
In offset printing, the blanket cylinder once receives the ink transferred from the ink supply roll to the printing plate, and prints the ink on the printing medium. The blanket cylinder is an impression cylinder wound with a smooth rubber blanket.
As shown in FIG. 5A, it is normal that the pattern 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, the transparent silk screen ink printing layer 12 and the adhesive layer 11 are formed on the pattern ink 3 on the blanket cylinder as shown in FIG. It will be taken by blanket cylinder 30 in the state where it overlapped and adhered. In such a state, smooth offset pattern printing is impossible.

In general, a volatile drying type adhesive is used as the adhesive, and the solvent is evaporated and dried with hot air or an infrared heater before the transparent silk screen ink printing layer 12 is formed. Even if the adhesive volatilizes the solvent to some extent, the residual solvent is present and inherently has 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. Compared to the case of the substrate, it is significantly reduced. Therefore, 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 greater than the adhesive force between the peelable substrate (seal mount) 10 and the adhesive layer 11. If it becomes larger, the phenomenon shown in FIG. 5B will occur.

On the other hand, a UV curable adhesive may be used alone as the adhesive. The UV curable pressure-sensitive adhesive is a kind of active energy ray curable adhesive and changes its phase from a liquid to a solid phase by a chain photopolymerization reaction when irradiated with ultraviolet rays. Unlike a volatile dry adhesive, a UV curable adhesive uses a monomer instead of an organic solvent. When using at low viscosity like gravure ink, a general organic solvent is used as a dilution solvent.When using it at a relatively high viscosity like silk screen ink, it is possible to adjust the viscosity with only the monomer. Become. A photopolymerization initiator may be added as a sensitizer.

Since the UV curable adhesive has high adhesive strength when uncured, it is cured by irradiating with ultraviolet rays before printing the transparent silk screen ink printing layer 12. Since it is cured instantaneously by ultraviolet irradiation, it is generally difficult to reproduce an intermediate state before and after curing.
Therefore, in the method for producing 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 adhesive, the volatile drying adhesive is dried by drying with normal hot air or an infrared heater, but without UV irradiation, the UV curable adhesive is kept in an uncured state. It is intended to obtain a good adhesive strength state.
Of course, after completion of the seal, ultraviolet rays are irradiated to promote curing, but ultraviolet rays may be irradiated immediately before shipment.

Next, the seal | sticker obtained with the manufacturing method of this invention is demonstrated.
FIG. 2 is a cross-sectional view showing the completed seal.
As shown in FIG. 2, a seal portion 2 is formed on a peelable substrate (seal mount) 10.
A portion between the pressure-sensitive adhesive layer 11 and the transparent silk screen overprint layer 14 excluding the substrate 10 having peelability corresponds to the seal portion 2. Since the base material 10 is peelable, the pressure-sensitive adhesive layer 11 of the seal part 2 can be peeled from the base material 10. Only the seal part 2 is used as a seal that is adhered to the adherend. Usually, the thickness of the seal part 2 excluding the base material 10 having peelability is set to 180 to 250 μm.

It is preferable that the thickness of the seal portion 2 is set to the above-mentioned thickness in order to secure the repeated sticking / peeling property of the seal portion 2. The thickness of the pressure-sensitive adhesive layer 11 is preferably 20 to 30 μm from the viewpoint of protecting the seal portion 2. The pattern print layer 13 is sized to fit within the shapes of the transparent silk screen ink print layer 12 and the transparent silk screen overprint layer 14. This is for the purpose of protecting the pattern printing layer 13.

The transparent silk screen ink printing 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 pressure-sensitive adhesive layer 11 can be substantially similar to each other, the transparent silk screen ink printing layer 12 is at least as wide as the outer edge of the pressure-sensitive adhesive layer 11 as shown in FIG. It is preferable to form in a size expanded (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, it is easy to peel off from the base material 10, and even when the seal part 2 once attached to the adherend is peeled off again, peeling is easy. Because it becomes. Moreover, if the area of the pressure-sensitive adhesive layer 11 is larger, there may be a portion where the pressure-sensitive adhesive comes out on the surface, which may cause problems in other processes.

FIG. 3 is a perspective view of a state where the seal portion is attached to the adherend.
As shown in FIG. 3, when the seal portion 2 is attached to the inner surface of the transparent adherend 20 with the adhesive layer 11, the picture 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 pattern printing layer 13, the pattern printing layer 13 can be visually recognized from the outer surface side of the transparent adherend 20. In many cases, the outer side is a symmetrical pattern as viewed from the inner side, but depending on the degree of overlap of the pattern inks, the symmetrical pattern is not necessarily obtained.
It is obvious that when the pattern printing layer 13 has a white hiding layer, the pattern printing layer 13 cannot be seen from the opposite side even if it is attached to a transparent adherend. .

The total thickness of the seal portion 2 is preferably 150 μm or more so as to have a thickness equivalent to that of a general seal with a paper substrate. Since the pattern printing layer 13 has many delicate patterns, an offset printing method is adopted. 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. Further, the transmission density of the portion where three layers of the pressure-sensitive adhesive layer 11, the transparent silk screen ink printing layer 12, and the transparent silk screen overprint layer 14 are laminated (not including the picture printing layer 13) is less than 0.1. It is preferable. This is because it is preferable that the purpose of clearly seeing the pattern and the part other than the pattern are not noticeable.

<Embodiment related to material>
Various materials used in the present invention will be described.
(1) Release paper base and release agent Release paper base 10 can be used as long as it has sufficient strength. For example, fine 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 in contact with the pressure-sensitive adhesive layer 11 and used.
As the release agent for forming the release layer, an ultraviolet curable medium ink added with silicone oil or a silicone acrylate added 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 and dry pressure-sensitive adhesives A pressure-sensitive adhesive having weak adhesiveness can be widely used for forming the pressure-sensitive adhesive layer 11.
As the weak adhesive pressure sensitive adhesive, those composed of a rubber system such as NR, SBR, IR, CR and a solvent are mainly used, but an emulsion type acrylic pressure sensitive adhesive can also be used. In addition, there are silicon type, polyvinyl ether type, etc., any of which can be used. In general, 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 adhesive and changes its phase from a liquid to a solid by a chain photopolymerization reaction when irradiated with ultraviolet light. . 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 or alicyclic epoxy, serves as a diluting solvent and also serves as a crosslinking agent.
Usually, the material loses its tackiness after photocuring, but when used in the present seal, a material that is designed not to cure completely but to remain tacky after curing is used.

(4) Silk screen ink solvent type uses various polymer resins (molecular weight 10,000 to several hundred thousand) such as cellulose, vinyl chloride and acrylic, and organic solvent (boiling point 120 to 220 ° C). ) Is used as a diluent.
For the ultraviolet curable type, a prepolymer having a double bond (molecular weight: 500 to 5000) is used. As the diluent, a monomer having a double bond is used.
Adjuvants such as antifoaming agents, waxes, leveling agents and lubricants are added. In the case of coloring, coloring materials such as pigments are added.

Example 1
As the base material 10 having peelability, a base material (thickness: 250 μm) obtained by coating a high-quality paper with a silicon-based release agent was used to manufacture the seal 1.
As a pressure-sensitive adhesive, a solvent-soluble volatile dry acrylic pressure-sensitive adhesive (dipropylene glycol diacrylate, trade name SR508 manufactured by Sartomer) 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 acrylic pressure-sensitive adhesive and the UV curable pressure-sensitive adhesive was 100: 82 in terms of the mass ratio of the ink. A 200 mesh polyester screen was used for the application of the adhesive.
Although the drying with hot air and an infrared heater was performed, the following process was performed without drying by ultraviolet irradiation. In addition, the thickness of the adhesive layer 11 after drying became 20-25 micrometers.

The transparent silk screen ink printing layer 12 was printed on the surface of the pressure-sensitive adhesive layer 11 using an acrylic ester silk screen medium ink. A 60 mesh stainless screen was used for printing the printing layer 12. 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 transparent silk screen ink printing layer 12 after drying, a pattern was printed using a normal offset ink which is not an ultraviolet curable type by an offset printing method to form a pattern printing layer 13. The thickness of the pattern printing layer 13 was 1 μm or less.
On the pattern print layer 13, the transparent silk screen overprint layer 14 was printed twice using an acrylic ester silk screen medium ink. The total thickness of the transparent silk screen overprint layer 14 was about 70 to 90 μm. A 60 mesh polyester screen was used for printing the transparent silk screen overprint layer 14. Finally, ultraviolet rays were irradiated by a UV lamp to cure the UV curable pressure-sensitive adhesive and reduce the viscosity. The total thickness of the seal portion 2 was 130 to 170 μm.

(Example 2)
The same peelable substrate 10 as in Example 1 was used, the same adhesive and the same printing ink were used, and the seal 1 was produced under the same conditions.
However, the ratio of the volatile dry acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was 100: 60 in terms of the mass ratio of the ink.
Although the drying with hot air and an infrared heater was performed, the following process was performed without drying by ultraviolet irradiation. In addition, the thickness of the adhesive layer 11 after drying became 20-25 micrometers.
The pattern printing layer 13 and the transparent silk screen overprint layer 14 were formed under the same conditions as in Example 1. The total thickness of the seal portion 2 was 130 to 170 μm.

Example 3
The same peelable substrate 10 as in Example 1 was used, the same adhesive and the same printing ink were used, and the seal 1 was produced under the same conditions.
However, the ratio of the volatile dry acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was 100: 42 in terms of the mass ratio of the ink.
Although the drying with hot air and an infrared heater was performed, the following process was performed without drying by ultraviolet irradiation. In addition, the thickness of the adhesive layer 11 after drying became 20-25 micrometers.
The pattern printing layer 13 and the transparent silk screen overprint layer 14 were formed under the same conditions as in Example 1. The total thickness of the seal portion 2 was 130 to 170 μm.

(Comparative Example 1)
The same peelable substrate 10 as in Example 1 was used, the same adhesive and the same printing ink were used, and the seal 1 was produced under the same conditions.
However, the ratio of the volatile dry acrylic pressure-sensitive adhesive and the UV curable pressure-sensitive adhesive was 100: 100 in terms of the mass ratio of the ink.
Although the drying with hot air and an infrared heater was performed, the following process was performed without drying by ultraviolet irradiation. In addition, the thickness of the adhesive layer 11 after drying became 20-25 micrometers.
The pattern printing layer 13 and the transparent silk screen overprint layer 14 were formed under the same conditions as in Example 1. The total thickness of the seal portion 2 was 130 to 170 μm.

(Comparative Example 2)
The same peelable substrate 10 as in Example 1 was used, the same adhesive and the same printing ink were used, and the seal 1 was produced under the same conditions.
However, the ratio of the volatile dry acrylic pressure-sensitive adhesive to the UV curable pressure-sensitive adhesive was 100: 20 in terms of the mass ratio of the ink.
Although the drying with hot air and an infrared heater was performed, the following process was performed without drying by ultraviolet irradiation. In addition, the thickness of the adhesive layer 11 after drying became 20-25 micrometers.
The pattern printing layer 13 and the transparent silk screen overprint layer 14 were formed under the same conditions as in Example 1. The total thickness of the seal portion 2 was 130 to 170 μm.

In said Example 1- Example 3, in the pattern printing by offset printing method, in the state in which the adhesive layer 11 and the transparent silk screen ink printing layer 12 overlapped, the problem which will be taken by the blanket cylinder of an offset printing machine. Although it did not occur, in Comparative Example 2, since the addition amount of the UV curable adhesive was small, this problem occurred as in the case of the volatile dry adhesive alone.
Further, in Comparative Example 1, since the amount of the UV curable adhesive added is too large, when the transparent silk screen ink printing layer 12 is printed, the silk screen mesh adheres to the surface of the adhesive layer 11 and the smooth transparent silk screen. It was confirmed that the ink printing layer 12 could not be printed.
The results are shown in Table 1.

In Table 1 above, the ratio of the UV curable adhesive is [B / (A + B)] × 100 when the mass of the volatile drying adhesive is A and the mass of the UV curable adhesive is B. It is a calculated value.
In the results, “good” means that the adhesive layer 11 and the transparent silk screen ink printing layer 12 are removed from the peelable substrate 10 on the blanket cylinder during the pattern printing by offset and the silk screen on the adhesive layer 11 surface. It shows that the phenomenon of mesh sticking did not occur.
“Phenomenon that adheres to the mesh” indicates that a phenomenon occurs in which the silk screen mesh adheres to the surface of the 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 when the adhesive layer 11 and the transparent silk screen ink printing layer 12 are overlapped from the peelable substrate 10 when the pattern is printed by offset. Show.
From the above results, it is recognized that the addition ratio (mixing ratio) of the UV curable adhesive in the total amount of the adhesive is preferably about 30 to 45%.

1 Seal 2 Seal Part 3 Picture Ink 10 Base Material (Seal Mount)
DESCRIPTION OF SYMBOLS 11 Adhesive layer 12 Transparent silk screen ink printing layer 13 Picture printing layer 14 Transparent silk screen overprint layer 20 Substrate 25 Silk screen plate 30 Blanket cylinder

Claims (5)

A method for producing a seal having a seal part that is peeled off from a base material having a releasability, and (1) a volatile drying-type pressure-sensitive adhesive and an ultraviolet curable pressure-sensitive adhesive on the surface of the base material A step of applying a pressure-sensitive adhesive added with a silk screen printing method to form a pressure-sensitive adhesive layer having a predetermined shape; (2) on the pressure-sensitive adhesive layer in an uncured state without irradiating with ultraviolet rays. A step of forming a transparent silk screen ink printing layer by printing a transparent silk screen medium ink on (3) a step of forming a pattern printing layer on the transparent silk screen ink printing layer by an offset printing method; and (4) the pattern. A step of printing a transparent silk screen medium ink on the printed layer to form a transparent silk screen overprint layer; (5) the adhesive layer is irradiated with ultraviolet rays to reduce the adhesiveness; That step, the manufacturing method of the seal characterized in that it comprises a. In the manufacturing method of a seal in which a seal part composed of an adhesive layer, a transparent silk screen ink printing layer, a pattern printing layer by offset printing, and a transparent silk screen overprint layer is laminated in this order on a substrate having peelability. After applying the silkscreen printing method to the pressure-sensitive adhesive layer and adding a UV-curable pressure-sensitive adhesive to the volatile drying-type pressure-sensitive adhesive in a mass ratio of 30 to 45% with respect to the total amount of the pressure-sensitive adhesive. In the state that UV curing adhesive is not cured without UV irradiation, transparent silk screen ink printing layer, pattern printing layer by offset printing method, and transparent silk screen overprint layer are sequentially formed. Then, the method for producing a seal is characterized in that the adhesiveness of the pressure-sensitive adhesive layer is lowered by ultraviolet irradiation thereafter. The method for manufacturing a seal according to claim 1, wherein the seal portion is formed to a thickness of 150 to 250 μm. The thickness of the said adhesive layer is formed in 20-30 micrometers, The manufacturing method of the seal | sticker of Claim 1 or Claim 2 characterized by the above-mentioned. The transparent silk screen ink printing layer is printed so as to be substantially similar to the outer shape of the pressure-sensitive adhesive layer, and the transparent silk screen ink printing layer has a width of at least 0.3 to 0.5 mm from the outer edge of the pressure-sensitive adhesive layer. 3. The method of manufacturing a seal according to claim 1, wherein the seal is formed in a size expanded by the method.

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