JP5092090B2 - Water transfer sheet and water transfer release 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 water transfer 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.

Using a base film with a release layer mainly composed of at least an acrylic resin, an intermediate transfer sheet in which an image receiving layer is laminated , and a water transfer release sheet having a hot melt adhesive layer on a sheet provided with a water-soluble glue layer on paper, A water transfer sheet formed by printing an image on an intermediate transfer sheet with a thermal transfer printer and then retransferring the image from the release layer to the image from the intermediate transfer sheet onto the water transfer release sheet with a heat roller or the like. Is provided.
The present invention is described in detail below. Procedure 1. First, at least an intermediate transfer sheet FIG. 1 and a melt thermal transfer ribbon are prepared on a base film used in the present invention.
Procedure 2. 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.
Procedure 3. Next, a water transfer release sheet having a hot melt adhesive layer on a sheet provided with a water-soluble glue layer on paper is prepared. FIG.
Procedure 4. This water transfer release sheet and the intermediate transfer sheet on which the image pattern has been formed are superimposed, and the release layer and the image pattern are transferred from the intermediate transfer sheet to the water transfer release sheet by a heat roller or the like. To complete. FIG.
Procedure 5. 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.
Procedure 6. Next, the paper is peeled off, and the water-soluble paste layer surface is applied to the skin. FIG.
As described above, a high-definition image pattern can be formed on the skin.

A water transfer sheet in which an intermediate transfer sheet and a water transfer release layer sheet are used to form an image with a fusion thermal transfer printer can produce 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 melt thermal transfer image recording having at least a release layer on a substrate film. As the base film used in the present invention, various known films are used as conventional base films for melt transfer ribbons, but a PET film having a thickness of 9 to 100 μm is used from the viewpoint of durability, heat transfer, and cost. It can be preferably used.

  The release layer used in the present invention has a performance of peeling from the base material at the time of retransfer, and as the main material, an acrylic resin, an epoxy resin, a ketone resin, a cellulose resin, or the like can be preferably used. Particularly preferably, an acrylic resin is the main material. Moreover, you may add a polyester resin, a urethane resin, vinyl chloride vinyl acetate copolymer resin, etc. in the meaning which controls the peelability and intensity | strength from a base material. The thickness of the release layer is preferably 1 to 10 μm from the viewpoint of thermal sensitivity and adhesiveness. In addition, an image receiving layer may be provided on the surface in order to improve printability by fusion heat transfer. It is preferable to use a styrene resin, epoxy resin, acrylic resin, etc. for the image receiving layer, and if necessary, add a flexible and highly adhesive urethane resin, polyester resin, olefin resin, etc. in order to increase adhesion. Can do. 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 order to increase the fastness of the final product, a curing protective layer made of a thermosetting resin or a UV curable resin may be provided between the release layer and the image receiving layer.

  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 water transfer 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 glue 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 is sufficiently water-absorbing and wets the water-soluble glue layer while maintaining its shape without being dissolved by water absorption. It is dissolved and exhibits releasability during water transfer.

  As the main component of the water-soluble paste layer, dextrin, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyvinyl methyl ether, poly (meth) acrylic acid-containing polymer, etherified starch, starch and the like are preferably used. In addition, PEG, a polymer absorber, porous particles, etc. may be added to increase water retention. The thickness of the water-soluble paste layer is preferably 1 to 10 μm.

Furthermore, dextrin with high water solubility, low molecular polyvinyl alcohol, etc. are used for a water soluble layer. The thickness of the water-soluble layer is preferably 1 to 10 μm. Next, a wet adhesive layer is provided on the water-soluble layer. As the main component of the wet adhesive layer, dextrin, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyvinyl methyl ether, poly (meth) acrylic acid-containing polymer, etherified starch, starch and the like are preferably used. In addition, PEG, a polymer absorber, porous particles, etc. may be added to increase water retention.

  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 2 μm.

Release layer ink
Acrylic resin 9
Polyester resin 1
Methyl ethyl ketone 90
100 parts by weight in total On the release layer-coated sheet, the following image-receiving layer ink was dried and applied at a thickness of 2 μm 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 water transfer release sheet Using single-sided art paper coated on one side, a 6% aqueous solution of etherified starch was applied as an undercoat layer on the coated surface so that the dry coating amount was 2 μm. Further, the following water-soluble paste layer ink as a water-soluble paste layer was dried on this undercoat layer and then applied to a thickness of 5 μm.
Water-soluble glue layer ink
Polyvinyl alcohol 5
Dextrin 4
PEG 1
Distilled water 20
30 parts by weight
A 20% toluene solution of ethylene vinyl acetate copolymer (MFR150, VA% 28%) as a hot-melt adhesive layer is dried on the water-soluble adhesive layer and then applied to a thickness of 5 μm to create a water transfer release sheet. did.

(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 the item (4) and the water transfer release sheet prepared in the item (3) are bonded together, and an image is transferred from the intermediate transfer sheet using a laminator with a heating roller. Retransfer was carried out to prepare a water transfer sheet.
Laminator temperature 110 ℃
Laminator speed 1 inch / min

(6) Transfer of water to skin The above-prepared water transfer sheet was immersed in water, the art paper was peeled off, and the water-soluble adhesive layer side was brought into close contact with the skin to transfer the image. As a result, a good high-definition image following the skin could be formed.

(Example 2)
The water transfer release sheet of Example 1 was prepared by the following procedure.
Using single-sided coated single-sided art paper, an etherified starch 6% aqueous solution was applied to the coated surface as an undercoat layer so that the dry coating amount was 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.
Further, the following ink was dried as a wet adhesive layer on the water-soluble layer, and then applied to a thickness of 5 μm.
Wet adhesive layer ink
Polyvinyl alcohol 8
Dextrin 1
PEG 1
Methanol 40
Distilled water 50
100 parts by weight

A 20% toluene solution of ethylene vinyl acetate copolymer (MFR150, VA% 28%) as a hot-melt adhesive layer is dried on the water-soluble adhesive layer and then applied to a thickness of 5 μm to create a water transfer release sheet. did. A water transfer sheet was prepared in the same manner as in Example 1 and dipped in water to peel off the art paper. As a result, a good high-definition image following the skin could be formed.

Evaluation of skin fixability Rating criteria Can transfer to skin but peels off quickly ×
Can be transferred to the skin, but partly peels off when contracted.
Can transfer to skin and fix well ○

Evaluation results
Table 1

Intermediate transfer sheet Image pattern formation by fusion thermal transfer to an intermediate transfer sheet Water transfer release sheet (1) Retransfer of image from intermediate transfer sheet to release sheet by heat roller Water transfer sheet immersion Transfer of water transfer sheet to skin Water transfer release sheet (2) Water transfer sheet (2) Transfer of water transfer sheet (2) to skin

Explanation of symbols

1 base film
2 peeling delaminated 3 melt thermal transfer ribbon 4 head 5 intermediate transfer sheet 6 platen roller 7 printed image pattern 8 hot-melt adhesive layer 9 water-soluble glue layer 10 of paper 11 water transfer release sheet 12 the heat roller 13 water 14 skin 15 wetting Adhesive layer 16 water-soluble layer

Claims (1)

Using a base film with a release layer mainly composed of at least an acrylic resin, an intermediate transfer sheet in which an image receiving layer is laminated , and a water transfer release sheet having a hot melt adhesive layer on a sheet provided with a water-soluble glue layer on paper, A water transfer sheet formed by printing an image on an intermediate transfer sheet with a thermal transfer printer and then retransferring the image from the release layer to the image from the intermediate transfer sheet onto the water transfer release sheet with a heat roller or the like. .

Images