JP2000006596A - Water transfer sheet, its manufacture, and water transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To print the same image with a good productivity, and make the mass-production possible by sticking an adhesive large face of an adhesive sheet and a printing part on a printing sheet to bring them into contact with each other. SOLUTION: A roll for which an adhesive sheet 8 is wound in such a manner that a second release material 7 may become outside, is prepared. The roll of the adhesive sheet 8 is set in an adhesive sheet feed out drum 19, and an exposed adhesive layer 6 and the face of a printing layer 9 of a printing sheet 4 are affixed by pressing with a press roll 13 while peeling the second release material 7, and the water transfer sheet is produced. The peeled second release material 7 is taken up by a release material take-up drum 20. When there is no second release material 7, the roll of the adhesive sheet 8 which is wound into a roll-form in such a manner that a first release material 5 may become outside, is set in the adhesive sheet feed out drum 19, and the adhesive sheet 8 is fed out, and affixed with the printing layer 9 of the printing sheet 4 while exposing the adhesive layer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water transfer sheet for transferring an image or the like to various adherends by water and a method for producing the same, and more particularly to a water transfer sheet suitable for skin and a method for producing the same.

[0002]

2. Description of the Related Art Various types of transfer sheets include an organic solvent transfer type, a thermal transfer type, an adhesive transfer type and a water transfer type. A water transfer sheet using water for transferring an image is preferably used when it is desired to avoid using an organic solvent or when heat cannot be applied.

[0003] In recent years, it has become popular to decorate the human body with the same mark or the like at the time of support or the like in watching sports. First, a seal that can be used in such a case must be one that does not adversely affect the human body, and it is necessary that the same design can be mass-produced. Since a water transfer sheet does not use an organic solvent, it does not adversely affect the human body, and does not need to apply heat at the time of transfer, so that it can be applied to sticking to human skin.

However, in the conventional water transfer sheet, since thermal transfer printing is used for printing an image, it takes a long time to dry the printing, and the line speed must be extremely reduced, which is not suitable for mass production. In addition, in order to perform multicolor printing by printing using ordinary oxidation polymerization type ink, it is necessary to dry each time one color is printed, and then to print the next color again, which requires more time. The demand for mass production with color printing could not be met at all.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a water transfer sheet capable of printing the same image with high production efficiency and mass-producing the same, and a method of manufacturing the same. The purpose is to: Another object of the present invention is to provide a water transfer sheet which is excellent in followability and sticking properties to various adherends, particularly to the skin, and which integrates images and the like with an adherend (for example, the skin) well, and a method for producing the same. I do.

[0006]

According to a first aspect of the present invention, there is provided a method of manufacturing a water transfer sheet, comprising: a printing sheet having a water-soluble layer and a cover layer provided on a printing sheet base; and an adhesive having a pressure-sensitive adhesive layer provided on a release material. After forming a sheet, the cover layer of the printing sheet is printed with a radiation-curable ink and the ink is cured with radiation to form a printed portion, and then the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet, and the printing sheet It is characterized in that it is bonded so that the upper printed portion is in contact with it.

Here, printing on the cover layer of a printing sheet using radiation-curable ink and curing the ink with radiation means printing using an ultraviolet-curable ink, and curing by irradiating ultraviolet rays. Is also good.

[0008] The invention of a water transfer sheet according to claim 3 is characterized in that the water transfer sheet is manufactured by the above-described method for manufacturing a water transfer sheet.

A water transfer method according to a fourth aspect of the present invention is a water transfer method for performing water transfer using any of the water transfer sheets described above, wherein the pressure-sensitive adhesive layer exposed by peeling off a release material of the water transfer sheet. Is adhered to an adherend, and then the print sheet substrate is removed from the cover layer by dissolving the water-soluble layer with water to form a layer comprising an adhesive layer, a print layer and a cover layer on the adherend. It is characterized by the following.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the method for producing a water transfer sheet of the present invention, a cover layer of a print sheet having a water-soluble layer and a cover layer provided on a print sheet substrate is printed using a radiation-curable ink. A step of repeating the operation of curing the ink with radiation one or more times. In the present invention, radiation means radiation in a broad sense, and includes electromagnetic waves and particle beams. In the step of curing with such radiation, it is necessary that the printed ink be cured with radiation immediately. If the printed ink cures and dries immediately,
The type of ink and the curing method are not particularly limited. For example, printing is performed using an ultraviolet curable ink (UV ink), and thereafter, the printed portion is cured by irradiating ultraviolet light, or electron beam curing. It is preferable to print using a mold ink (EB ink), and then irradiate an electron beam to cure the printed portion.

As the UV ink preferably used in the present invention, commercially available UV inks can be used, and examples thereof include the FX series trade name "UV Ace" (manufactured by Kuboi Ink Co., Ltd.).

In the case of the thermal transfer type ink, it takes a long time to print, and the production efficiency is poor. For example, it took about 3 minutes to print a postcard size ink. According to the present invention, printing can be performed in 1 second or less. . In addition, in the case of an ink obtained by oxidative polymerization, drying takes a long time, so that when another color is immediately superimposed on one color, the color becomes turbid. However, if, for example, a UV ink is used as in the present invention, the UV ink becomes faster. Since it is dry, colors can be superimposed without time delay, and full-color printing can be performed in a short time.

The printing using UV ink can be applied to, for example, drum type printing. By repeating the drying operation for a desired number of colors, that is, by setting a set of a printing unit and a UV irradiation unit as a set around the drum for a desired number of colors, multicolor printing becomes possible. For example, flexographic printing is suitable for printing using the UV ink of the present invention.
M-300 "(manufactured by Lintec Corporation)," MA-91 "
0 "(manufactured by Lintec Corporation)," MA-2200 "
(Manufactured by Lintec Corporation).

The electron beam-curable ink (EB ink) is an ink that is cured and dried by irradiation with an electron beam.
It is instantaneously cured and dried by electron beam irradiation. The EB ink contains almost the same components as the UV ink, but does not require the addition of a photopolymerization initiator, which is an essential component of the UV ink. Examples of the EB ink preferably used in the present invention include commercially available inks.

The water transfer sheet according to the present invention is shown in FIGS.
This will be described with reference to FIG. FIG. 1A is a schematic sectional view of a printing sheet, and FIG. 1B is a schematic sectional view of an adhesive sheet. The water transfer sheet according to the present invention includes a printing sheet 4, an adhesive sheet 8, and a printing layer 9. Printing sheet 4
Is a structure composed of a printing sheet substrate 1, a water-soluble layer 2 and a cover layer 3 in this order, and the pressure-sensitive adhesive sheet 8 is a structure composed of a second release material 7, a pressure-sensitive adhesive layer 6 and a first release material 5 in this order. It is.

Here, as the printing sheet substrate 1, it is preferable to use a substrate having good water permeability and a substrate having good smoothness, and examples thereof include high quality paper and coated paper. In addition, it is more preferable that the high-quality paper having good water permeability without sizing, coated paper, or a normal high-quality paper subjected to sizing such as a surfactant, coated paper, etc., to further improve the water permeation is used. .

A water-soluble layer 2 is provided on one side of the printing sheet substrate 1. Dextrin, pregelatinized starch, etherified starch, esterified starch, polyvinyl alcohol, gum arabic, and the like are used for the water-soluble layer 2, and these can be used alone or in combination. A water retention agent such as sodium pyrrolidonecarboxylate, sodium lactate, or polyethylene glycol can be blended in the water-soluble layer 2. When a water retention agent is added, the water dissolving layer 2
Water retention is increased, and the occurrence of cracks can be suppressed at low humidity.

The thickness of the water-soluble layer 2 is 0.5 μm or more,
0 μm or less, more preferably 3 μm or more,
It is preferably 10 μm or less. When the thickness of the water-soluble layer 2 is 0.5 μm or more, the transfer can be easily performed. When the thickness is 60 μm or less, the dissolution of the water-soluble layer 2 during use does not take too much time, and the transfer time is long. It is preferable in use because it does not become too much.

The cover layer 3 used in the present invention is not particularly limited as long as it has printing suitability, is excellent in transparency, and is excellent in adhesion to the pressure-sensitive adhesive layer 6.

The resin used for the cover layer 3 is a styrene resin, an acrylic resin, a cellulose derivative such as ethyl cellulose or cellulose acetate, or a styrene acrylic copolymer. These resins may be used alone or in combination. it can. Further, in the present invention, a resin having a heat melting property such as an ethylene-vinyl acetate copolymer, a butyral resin, a polyethylene resin, and a styrene-isoprene-styrene copolymer can be blended. Further, the cover layer 3 includes hydrated silicic acid (silica), titanium oxide,
Fillers such as aluminum hydroxide, calcium carbonate, kaolin and the like can be added. When the filler is blended within a range where the transparency of the cover layer 3 is not impaired, the printing surface of the cover layer 3 becomes porous, and the printability at the time of printing can be improved.

The thickness of the cover layer 3 is 0.5 μm or more,
0 μm or less, more preferably 2 μm or more,
It is preferably 10 μm or less. This is because if the thickness of the cover layer 3 is 0.5 μm or more, a uniform cover layer 3 can be obtained, and if it is 60 μm or less, the user does not feel uncomfortable after attaching.

The first release material 5 is not particularly limited as long as it has transparency. For example, films of polyethylene terephthalate, polycarbonate, polyethylene naphthalate, polypropylene, polyvinyl chloride, polyethylene, polymethyl methacrylate, polyacrylonitrile, triacetyl cellulose, polymethyl pentene and the like can be mentioned. Note that these films may be subjected to a release treatment by applying a silicone resin, a fluorine resin, or the like.

The adhesive used for the adhesive layer 6 includes:
Acrylic-based, rubber-based, and silicone-based adhesives can be used, and for example, an acrylic-based adhesive is preferably used. When the adherend is skin or the like, the thinner the pressure-sensitive adhesive layer 6 is, the better the thickness of the pressure-sensitive adhesive layer 6 is, considering the feeling of use and the effect on the skin. However, the thickness of less than 3 μm is difficult to manufacture. Therefore, the thickness of the pressure-sensitive adhesive layer 6 is preferably 3 μm or more and 50 μm or less, and more preferably 3 μm or more and 10 μm or less. When the thickness is more than 50 μm, the image does not blend with the skin or the like when attached, and the image appears to be on the skin. In addition, it is easily peeled off due to friction with clothes.

The second release material 7 is not particularly limited as long as it can be released from the adjacent pressure-sensitive adhesive layer 6. Examples of the second release material 7 include a base material obtained by applying a release imparting compound such as a silicone resin or a fluorine resin to a film or paper similar to the first release material 5. In addition, even in an untreated base material not subjected to such a coating treatment,
It can be used if it has releasability. Further, it is preferable that both surfaces of the first peeling material 5 can be peeled off. For example, it is preferable that silicon treatment is performed on both surfaces of the first peeling material 5. If the first release material 5 can be peeled off on both sides, a pressure-sensitive adhesive sheet is prepared, and then the first release material 5 is wound outside in the form of a roll with the first release material 5 on the outside. Can be held in contact with the surface.

The method for producing the water transfer sheet of the present invention will be described with reference to FIG. Note that, in FIG. 2, the figures surrounded by circles at the ends of the arrows are partially enlarged views of the printing sheet or the adhesive sheet, respectively.

The roll of the printing sheet 4 wound in a roll shape so that the cover layer 3 is on the inside is set on the printing sheet unwinding drum 18. The print sheet 4 is unwound from the roll and set so that the print sheet 4 advances along the rotating drum of the printing press 12. After printing the first color on the surface of the cover layer 3 of the print sheet 4 by the printing unit 10-1, the radiation is irradiated by the radiation irradiation unit 11-1 to cure the ink. Immediately thereafter, the printing unit 10-2 prints the second color and then irradiates it with radiation to cure the ink and perform two-color printing. Similarly, if the third color is printed, three-color printing can be performed. By repeating such printing and radiation curing operations a desired number of times, the printing sheet 4 can be printed.
To the desired multicolor printing.

Separately, the pressure-sensitive adhesive sheet 8 composed of the first release material 5, the pressure-sensitive adhesive layer 6, and the second release material 7 is attached to the second release material 7
Prepare a roll wound in a roll shape such that is outside. The roll of the adhesive sheet 8 is set on the adhesive sheet unwinding drum 19. While exfoliating the second release material 7, the exposed pressure-sensitive adhesive layer 6 and the surface of the printing layer 9 of the printing sheet 4 are pressed together by a press roll 13 to be bonded, thereby producing a water transfer sheet. The peeled second release material 7
May be wound up by the release material winding drum 20.

Here, the configuration of the pressure-sensitive adhesive sheet 8 may include a pressure-sensitive adhesive layer 6 and a first release material 5. In this case, that is, when there is no second release material 7, the roll of the adhesive sheet 8 wound in a roll shape such that the first release material 5 is on the outside is set on the adhesive sheet unwinding drum 19, The adhesive sheet 8 can be unwound to expose the adhesive layer 6 and be bonded to the print layer 9 of the print sheet 4. In such a case, since there is no second release material 7, the operation of peeling off the second release material 7 at the time of bonding becomes unnecessary.

As the water transfer sheet,
That is, the pressure-sensitive adhesive layer 6 and the surface of the print layer 9 of the print sheet 4 that are bonded together by the press roll 13 may be wound into a roll by the water transfer sheet winding drum 21 and stored. The following processing such as half-cut may be performed. That is, using the half-cut roll 14, a half-cut in which a cut is made from the printing sheet substrate 1 side of the obtained water transfer sheet to the adhesive layer 6 is performed.
Printed sheet substrate 1, water-soluble layer 2, cover layer 3, print layer 9
And an undesired portion up to the pressure-sensitive adhesive layer 6
To remove continuously. Next, the water transfer sheet is wound around the water transfer sheet winding drum 21 so as to form a roll. In addition, if the perforations are formed around the printed image using the perforated slitter roll 16 before winding the water transfer sheet, the water transfer sheet can be easily cut at the time of use, which is more convenient. is there.

In the present invention, the water transfer sheet may be stored in a roll state, but may be cut to a predetermined size by the sheet cutting device 17 and stored in a plain state. In this case, the water transfer sheet winding drum 21 can be changed to a water transfer sheet flat sheet receiving device (not shown).

A method for water transfer using the water transfer sheet of the present invention will be described with reference to FIG. 3 and FIG. FIG.
A desired image is selected from the images of the print layer 9 of the water transfer sheet shown in (c), and the periphery of the image is cut.
Thereafter, the first release material 5 is peeled off to expose the pressure-sensitive adhesive layer 6, and the pressure-sensitive adhesive layer 6 is adhered to a predetermined position of the adherend 22. Next, the printed sheet substrate 1 is covered with a cloth or the like that is sufficiently moistened with water, or the entire sheet is moistened. FIG. 3 schematically shows such a state. FIG. 3 shows a state in which the water dissolving layer 2 has begun to be dissolved by containing water, and if water is further contained, it is completely dissolved. When the water-soluble layer 2 is dissolved in water, the printed sheet substrate 1 can be removed from the cover layer 3. On the adherend 22, the adherend 22
In order from the side, only the pressure-sensitive adhesive layer 6, the printing layer 9, and the cover layer 3 remain, and a thin film having a printed image is stuck on the adherend.

[0032]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. However, in the following,% as a content unit indicates solid content weight%.

Example 1 First, a printing sheet 4 was prepared. The coated surface of the single-sided art paper "NK Art" (manufactured by Nippon Kaishi Co., Ltd.), which is the printing sheet substrate 1, is coated with 56% of hydroxyalkyl etherified starch "Solfalex 2350" (manufactured by Matsutani Chemical Industry Co., Ltd.) "Abedex W-90"
A mixture of 39% (manufactured by Matsutani Chemical Industry Co., Ltd.) and 5% of sodium pyrrolidonecarboxylate (manufactured by Ajinomoto Co.) was applied using an air knife coater so that the dry film thickness became 5 μm, and water was applied. Dissolution layer 2 was formed. Drying was performed at a drying temperature of 80 ° C. using a hot-air dryer.

Ethyl cellulose “N-4” (manufactured by Hercules Co., Ltd.) is applied to the surface of the applied water-soluble layer 2.
4% ethylene vinyl acetate copolymer "EVA-25"
4. 47.4% of silica (“Nip Seal SS-10”, manufactured by Nippon Silica Industry Co., Ltd.)
The mixed solution to which 2% was added was applied using an air knife coater so that the dry film thickness became 3 μm, and the cover layer 3 was formed. Drying was carried out at a drying temperature of 8 using a hot air dryer.
Performed at 0 ° C. Next, 1 g / m ² of a surfactant “Nonipol 40” (manufactured by Sanyo Chemical Co., Ltd.) was applied to the surface of the printed sheet substrate 1 opposite to the coated surface with a gravure coater,
A printing sheet 4 having good water permeability was produced. Drying was performed at a drying temperature of 60 ° C. using a hot-air dryer.

Next, an adhesive sheet 8 was prepared. As the first release material 5, a release film “SP-P” obtained by subjecting one surface of a 50 μm-thick polyester film to silicone treatment was used.
ET5011 "(manufactured by Lintec Corporation) and an acrylic solvent-based pressure-sensitive adhesive" PE-3 "
00 "(manufactured by Nippon Carbide Co., Ltd.) using a roll knife coater so as to have a dry film thickness of 5 μm.
Let dry. Drying was conducted at a temperature of 9 using a hot air dryer.
Dried at 0 ° C. Thereafter, as a second release material 7, a release-treated surface of release-treated glassine paper “KA-85G Asagi” (manufactured by Lintec Corporation) was adhered on the pressure-sensitive adhesive layer 6, thereby producing a pressure-sensitive adhesive sheet 8.

Next, on the surface of the cover layer 3 of the printing sheet 4, a plurality of designs and the like are coated with UV ink, trade name “UV Ace”.
An image was formed by full-color printing using "LPM-300" (manufactured by Lintec Corporation), which is a rotary printing press of a flexographic printing method, using (manufactured by Kuboi Ink Co., Ltd.). Thereafter, the second release material 7 of the pressure-sensitive adhesive sheet 8 was peeled off on the image, and the pressure-sensitive adhesive layer 6 which was exposed and was superimposed on the image to prepare a water transfer sheet. In this case, the printing speed was 20 m / min, and it was found that mass production was possible. In addition, it was found that the image of the obtained water transfer sheet showed excellent printability without white spots and stains on the pattern.

Next, water transfer of an image was performed using the obtained water transfer sheet as follows. First, the periphery of the image was cut while checking the position of the image from the transparent first release material 5 side. Thereafter, the first release material 5 was peeled off to expose the pressure-sensitive adhesive layer 6, and the image was stuck to a human arm via the pressure-sensitive adhesive layer, and then immersed in water to remove the print sheet substrate 1. At this time, the water-soluble layer 2 was also dissolved in water, and the cover layer 3 became the outermost layer.

When the state of the transferred image peeling from the skin was observed after 24 hours, it was found that there was no change in the image and the sticking property was good. Furthermore, since the thickness of the cover layer 3, the pressure-sensitive adhesive layer 6, and the print layer 9 was small, it was found that the cover layer 3, the adhesive layer 6 and the print layer 9 had good followability and were easily adapted to the skin.

Comparative Example 1 A printing was performed in the same manner as in Example 1 except that printing was performed by a thermal transfer printer using ordinary thermal transfer type ink. The printing speed was 5 cm / min, which was very slow. It was found that the productivity was extremely reduced and was unsuitable for mass production.

[0040]

According to the present invention, a water transfer sheet having excellent images can be mass-produced with high production efficiency. As a result, a low-cost water transfer sheet can be obtained. Further, according to the present invention, since the thickness of the pressure-sensitive adhesive layer, the printing layer, and the cover layer is thin, the transferred image has good followability and is easily adapted when used on the skin or the like.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a printing sheet, FIG. 1B is a cross-sectional view of an adhesive sheet, and FIG. 1C is a cross-sectional view showing a state of a water transfer sheet before transfer to an adherend. is there.

FIG. 2 is a schematic view of a water transfer sheet manufacturing apparatus.

FIG. 3 is a conceptual diagram showing a state in which a first release material is peeled off from a water transfer sheet and attached to an adherend.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Print sheet base material 2 Water-soluble layer 3 Cover layer 4 Print sheet 5 First release material 6 Adhesive layer 7 Second release material 8 Adhesive sheet 9 Print layer 10-1, 10-2, 10-3 Printing part DESCRIPTION OF SYMBOLS 11-1, 11-2, 11-3 Radiation irradiation part 12 Printing machine 13 Press roll 14 Half cut roll 15 Weaving up roll 16 Perforation slitter roll 17 Sheet cutting device 18 Printing sheet unwinding drum 19 Adhesive sheet unwinding drum Reference Signs List 20 Release material take-up drum 21 Water transfer sheet take-up drum 22 Adherend

Claims (4)

[Claims] 1. A printing sheet comprising a printing sheet substrate provided with a water-soluble layer and a cover layer, and a pressure-sensitive adhesive sheet having a release agent provided with a pressure-sensitive adhesive layer, and a radiation-curable ink is provided on the cover layer of the printing sheet. After performing printing using and curing the ink with radiation to form a printed portion, the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet and the printed portion on the printing sheet are bonded so as to be in contact with each other. A method for producing a water transfer sheet. 2. The method of printing on the cover layer of the printing sheet using a radiation-curable ink and curing the ink with radiation includes printing with an ultraviolet-curable ink and irradiating with ultraviolet light. The method for producing a water transfer sheet according to claim 1, wherein: 3. A water transfer sheet produced by the method according to claim 1. 4. A water transfer method for performing water transfer using the water transfer sheet according to claim 3, wherein an adhesive layer exposed by peeling off a release material of the water transfer sheet is attached to an adherend. Water, wherein the printed sheet base material is removed from the cover layer by dissolving the water-soluble layer with water to form a layer comprising an adhesive layer, a printed layer and a cover layer on the adherend. Transfer method.