JP5050161B2 - Water transfer sheet - Google Patents

Description

The present invention relates to a water transfer sheet for transferring an image onto various adherends, and particularly to a water transfer sheet suitable for skin.

Various transfer sheets include organic solvent transfer type, thermal transfer type, adhesive transfer type, and water transfer type. A water transfer sheet that uses water for image transfer is preferably used when it is desired to avoid the use of an organic solvent or when heat cannot be applied.
In recent years, there is a tendency to prefer images that are rich in individuality rather than uniform images produced by mass production. However, the conventional water transfer sheet tends to be a uniform image because many sheets of the same image are printed on the print layer by screen printing or the like to create a sheet. Further, screen printing requires a screen printing plate (stencil plate) and a plate having the number of colors necessary for the image. For example, in the case of three-color printing, three plates are five in five-color printing. A version is required. For this reason, it takes a lot of time and cost to create one image, which is not suitable for producing a small amount of image. In addition, in order to solve the above problems, methods for forming an image on the printing layer of the water transfer sheet by various printers have been proposed, but it is difficult to obtain a high-definition image with a rough surface of the water transfer sheet. It was.
In this specification, an image formed on a release sheet is called a water transfer sheet.

The present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a water transfer sheet that can easily print and transfer a single individual image instead of a uniform image with high precision. Objective.

In accordance with the present invention, an intermediate transfer sheet having a release layer that exhibits adhesiveness by containing water in at least the lowermost layer and an image receiving layer in the uppermost layer, and a sheet provided with a water-soluble layer on the base film It is formed by using a release sheet having a melt adhesive layer, printing an image on an intermediate transfer sheet with a thermal heat transfer printer, and then retransferring the image from the intermediate sheet onto the release sheet with a heat roller or the like. A water transfer sheet is provided.

The present invention is described in detail below. First, on the base film used in the present invention, an intermediate transfer sheet shown in FIG. 1 having a release layer that exhibits adhesiveness by containing water in at least the lowermost layer and an image receiving layer in the uppermost layer, and a melt thermal transfer ribbon are prepared.
Next, an image pattern is formed on the intermediate transfer sheet with a thermal transfer printer using the intermediate transfer sheet and the thermal transfer ribbon. FIG.
Next, a release sheet having a hot melt adhesive layer is prepared on a sheet provided with a water-soluble layer on paper. FIG.
This release sheet and the above-prepared intermediate transfer sheet with the image pattern formed thereon are overlaid with a heat roller or the like, and the release layer, the image receiving layer, and the image pattern are transferred from the intermediate transfer sheet to the release sheet. Finalize. FIG.
Next, in the method of transferring water to the skin using this water transfer sheet, first, the water transfer sheet is immersed in water, and the paper is sufficiently soaked. FIG.
Next, a release layer surface on which tackiness is generated by containing water on the side opposite to the paper is attached to the skin. FIG.
Next, the paper on the surface is peeled off, and the water-soluble layer component on the surface in FIG. 6 is washed with water. FIG.
As described above, a high-definition image pattern can be formed on the skin.

A release sheet on which an intermediate transfer sheet and a release sheet are used to form an image with a fusion thermal transfer printer can be a uniform water transfer sheet, and a high-definition image can be obtained.

Further, the transfer sheet used in the present invention will be described in more detail. The intermediate transfer sheet used in the present invention is an intermediate transfer sheet for recording a thermal transfer image having a release layer that exhibits adhesiveness by including water in at least the lowermost layer on the base film, and an image receiving layer in the uppermost layer. is there.

  As the base film used in the present invention, various known films are used as conventional base films for melt transfer, but a PET film of 9 to 100 μm is preferably used from the viewpoint of durability, heat transfer properties and cost. it can. The release layer used in the present invention is characterized by exhibiting adhesiveness when it contains water in addition to the ability to peel from the substrate during retransfer. In order to have such performance, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyvinyl methyl ether, poly (meth) acrylic acid-containing polymer, and dextrin can be preferably used as the main material. Moreover, you may add a polyester resin, a urethane resin, an acrylic resin, vinyl chloride vinyl acetate copolymer resin etc. in the meaning which controls the peelability and intensity | strength from a base film. Moreover, you may add PEG etc. in the meaning which improves a water retention effect. The thickness of the release layer is preferably 1 to 20 μm from the viewpoint of thermal sensitivity and adhesiveness.

  Next, it is preferable to use a styrene resin, an epoxy resin, an acrylic resin or the like for the image receiving layer used in the present invention. In addition, a flexible and highly adhesive urethane resin, polyester resin, olefin resin, or the like can be added as necessary to improve the adhesiveness. In addition, various fillers can be added in the sense of blocking and tack prevention. For example, fluorine resin particles, melamine resin particles, silicon particles, talc, kaolin, magnesium carbonate, potassium carbonate, titanium oxide, silica And starch. The thickness of the image receiving layer is preferably from 0.1 to 5.0 μm from the viewpoint of image receiving properties and thermal sensitivity.

  In addition, additives such as a film forming aid, a coating solution stabilizer, a leveling agent, and an antifoaming agent can be added to each layer.

  The release sheet used in the present invention is a release sheet having a hot melt adhesive layer on a sheet provided with a water-soluble layer on paper. As the paper, fine paper with good water immersion, coated paper, and the like are preferably used, and an undercoat layer containing water-soluble starch as a main component is usually provided on one of them. The undercoat layer is made of hydrophilic starch, and its function has sufficient water absorption performance, and it dissolves the water-soluble layer while maintaining its shape without dissolving itself by water absorption. It exhibits the peelability during water transfer. The water-soluble layer is mainly composed of water-soluble dextrin or the like. The thickness of the water-soluble layer is preferably 1 to 10 μm.

  Next, the hot melt adhesive layer exhibits adhesiveness to the intermediate transfer sheet at the time of retransfer, and a known hot melt adhesive can be used. For example, ethylene vinyl acetate copolymer, ethylene ethyl acrylate, polyamide resin, vinyl chloride vinyl acetate copolymer, styrene resin, acrylic resin, urethane resin, polyester resin and the like can be mentioned. From the viewpoint of familiarity with the skin after water transfer, a highly flexible ethylene vinyl acetate copolymer, ethylene ethyl acrylate, urethane resin, and polyester resin are particularly preferably used. Further, various fillers can be added in the sense of blocking and tack prevention. For example, fluorine resin particles, melamine resin particles, silicon particles, talc, kaolin, magnesium carbonate, potassium carbonate, titanium oxide, silica, Examples include starch. The thickness of the hot melt adhesive layer is preferably 0.1 to 10 μm.

  The melt thermal transfer ribbon used in the present invention is obtained by providing at least one hot melt ink layer on a conventionally used base film. As the substrate, a PET film having a thickness of 2 to 9 μm is used. The heat-meltable ink layer is obtained by blending a colorant such as a pigment or a dye with a binder such as a thermoplastic resin or wax. A heat-resistant treatment layer is provided on the opposite surface of the substrate.

  Hereinafter, the present invention will be described in more detail by way of examples with reference to the drawings. However, the present invention is not limited to the examples.

Example 1
(1) Preparation of intermediate transfer sheet The following ink was applied as a release layer on a PET film having a thickness of 16 μm after drying to a thickness of 5 μm.

Release layer ink
Polyvinyl alcohol 7
Dextrin 2
PEG 1
Distilled water 40
Methanol 50
100 parts by weight

The following image receiving layer ink was dried and applied at a thickness of 2 μm on the release layer coated sheet to form an intermediate transfer sheet.
Image-receiving layer ink
Epoxy resin 9
Polyester resin 1
Methyl ethyl ketone 90
100 parts by weight

(2) Preparation of fusion heat transfer ribbon Three colors consisting of yellow, magenta, and cyan are coated with a thickness of 0.6 μm after drying the following ink on a 4.5 μm thick PET film with a heat-resistant treatment layer on the back side. An ink ribbon was created.
Ribbon ink
Epoxy resin 4
Polyester resin 1
Pigment 4
Dispersant 1
Methyl ethyl ketone 40
50 parts by weight In total, yellow, magenta and cyan pigments are used.

(3) Preparation of release sheet A single-sided art paper coated on one side was used, and an etherified starch 6% aqueous solution was applied as an undercoat layer on the coated surface so as to have a dry coating thickness of 2 μm. Further, a 30% aqueous solution of dextrin was dried as a water-soluble layer on this undercoat layer, and then applied to a thickness of 5 μm. A 20% toluene solution of ethylene vinyl acetate copolymer (MFR150, VA% 28%) as a hot-melt adhesive layer was dried on the applied water-soluble layer and then applied to a thickness of 5 μm to prepare a release sheet. .

(4) Formation of image pattern by fusion thermal transfer onto intermediate transfer sheet A full color image was formed on the intermediate transfer sheet using the intermediate transfer sheet prepared above, a fusion thermal transfer ribbon, and the following fusion thermal transfer printer.
Thermal transfer printer: Test printer, 300 dpi edge head, peeling distance 10 mm
Image pattern: Portrait (ISO / DIS12640 registered image data)
Printing speed: 1 inch / second

(5) Preparation of water transfer sheet The image-formed intermediate transfer sheet prepared in (4) and the release sheet prepared in (3) are bonded together, and the image is retransferred from the intermediate transfer sheet using a laminator with a heating roller. Then, a water transfer sheet was prepared.
Laminator temperature 110 ℃
Laminator speed 1 inch / min

(6) Water Transfer to Skin After the water transfer sheet prepared above was immersed in water and the release layer side was brought into close contact with the skin, the art paper was peeled off to transfer the image to the skin. Thereafter, the remaining water-soluble layer component on the surface is washed with water. As a result, a good high-definition image following the skin could be formed.

Intermediate transfer sheet Image pattern formation by fusion thermal transfer to an intermediate transfer sheet Release sheet Retransfer of image from intermediate transfer sheet to release sheet by heat roller Water transfer sheet immersion Transfer of water transfer sheet to skin Finish after transfer

Explanation of symbols

1 base film 2 release layer that exhibits adhesiveness by containing water 3 image receiving layer 4 melt thermal transfer ribbon 5 thermal head 6 intermediate transfer sheet 7 platen roll 8 printed image pattern 9 hot melt adhesive layer 10 water dissolving layer 11 Paper 12 Release sheet 13 Heat roller 14 Water 15 Skin

Claims (1)

An intermediate transfer sheet having a release layer that exhibits adhesiveness by containing water in at least the lowermost layer on the base film and an image receiving layer in the uppermost layer, and a hot melt adhesive layer on a sheet provided with a water-soluble layer on the paper The image is formed by printing the image on the intermediate transfer sheet with a thermal transfer printer and then re-transferring the image from the release layer to the image on the intermediate transfer sheet using a heat roller or the like. Water transfer sheet.

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