JPH1120395A - Thermal transfer sheet and method for thermally transferring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold an image even by repeating washing with satisfactory operability without deviation of the image by providing a first transfer sheet and a second transfer sheet, and providing a pressure sensitive adhesive layer on the surface of the second sheet. SOLUTION: An image is printed on a thermal transfer layer 3 of a first transfer sheet 1, a release sheet of a second transfer sheet is released, a pressure sensitive adhesive layer 8 is superposed on a surface of the first transfer sheet 3, and the first and second transfer sheets are laminated by utilizing the adhesive layer. Thereafter, a base material 2 of the first sheet is released, and the layer 3 is superposed on material 10 to be covered. Then, heat is applied from a side of a base material 6 to thermally transfer an image forming layer 11 to the material to be covered. Then, when the material 6 is released, an erect image is transferred. The layer 11 is sequentially constituted from the side of material to be covered by a thermal transfer layer, print image, adhesive layer and thermal transfer layer so that a print image is sandwiched between the upper and lower thermal transfer layers. Therefore, in the case of using the thermal transfer layer or the adhesive layer having excellent light resistance and durability, light resistance and durability of the print image are upgraded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer sheet for printing and transferring an image and a method for thermally transferring an image using the thermal transfer sheet.

[0002]

2. Description of the Related Art Thermal transfer of an image can be performed by printing a mirror image on a thermal transfer sheet, or by forming a mirror image after a normal image is printed and thermally transferring the image. When a mirror image is printed, the thermal transfer sheet used is composed of a single transfer sheet, on which a mirror image is printed. When a normal image is printed and thermally transferred, the thermal transfer sheet is composed of two transfer sheets, a normal image is printed on the first thermal transfer sheet, and a mirror image of the normal image is printed on the second sheet. Heat transferred.

When printing a mirror image, a mirror image of the image to be transferred is first printed on a thermal transfer layer on a substrate. Next, the heat transfer layer is superimposed on the adherend, and heat is applied from the substrate side to thermally bond the mirror image to the adherend. As a result, a normal image is formed on the adherend.

A case where thermal transfer is performed using a first transfer sheet having a release layer on a substrate and a second transfer sheet having a thermal transfer layer on a substrate will be described below. First, a normal image is printed on the release layer of the first transfer sheet. Then the first
After the release layer of the transfer sheet and the thermal transfer layer of the second transfer sheet are overlaid, heat is applied from the base material side of the second transfer sheet to perform thermal bonding. Thereafter, the first transfer sheet is peeled off from the release layer, and a mirror image of the exposed surface of the thermal transfer layer is brought into contact with the adherend, and heat is transferred from the base material side by applying heat. The image transferred in this way is a normal image.

[0005]

In forming a thermal transfer image using a thermal transfer sheet composed of a single transfer sheet, if the image is formed by a printer or the like that cannot perform mirror image printing, the resulting transferred image becomes a mirror image. I will. Further, in the image thermally transferred using the thermal transfer sheet composed of one transfer sheet, the printed image is in direct contact with the adherend, and for example, in a T-shirt or the like where washing is frequently performed, water resistance is low. Insufficiency causes problems such as discoloration due to washing.

In the case of performing thermal transfer after printing a normal image, when the first transfer sheet and the second transfer sheet are bonded to each other, the image is transferred from the second transfer sheet to the adherend. Heat transfer must be performed twice when copying, and since the two sheets are bonded by heat, there is a problem that uniform bonding cannot be performed and an image shift occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a workable device which does not cause image displacement and which can retain an image even after repeated washing. An object of the present invention is to provide a thermal transfer sheet having excellent durability and excellent durability.

[0008]

According to the first aspect of the present invention, there is provided the following:
And a second transfer sheet, characterized in that the second transfer sheet has an adhesive layer on the surface.

Here, the first transfer sheet may have a structure composed of a substrate and a thermal transfer layer in this order, and the second transfer sheet may have a structure composed of a substrate, a thermal transfer layer and an adhesive layer in that order. .

According to a third aspect of the present invention, there is provided a method of forming an image on a first thermal transfer sheet, and a step of bonding an image-formed surface of the first transfer sheet to an adhesive layer of a second transfer sheet. And a step of thermally transferring the image to the adherend.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The thermal transfer sheet of the present invention is shown in FIG.
As shown in (a) and (b), the first transfer sheet 1 and the second transfer sheet 5 are composed of two sheets. The first transfer sheet 1 has a thermal transfer layer 3 on a base material 2, on which a printed layer 4 on which a normal image to be transferred is printed is formed. Second
The transfer sheet 5 has a heat transfer layer 7 and an adhesive layer 8 provided on a base material 6. Further, a release material 9 is provided on the adhesive layer 8 for convenient handling.

The present invention is not limited to these constitutions. For example, a release layer may be provided between the substrate and the thermal transfer layer so that the release property can be adjusted.

The materials of the base material in the first transfer sheet and the second transfer sheet may be the same or different. The material or the like of the base material is not particularly limited as long as it has heat resistance in the step of thermal transfer. For example, paper or a film which has been conventionally used as a base material of a thermal transfer sheet can be used. .

The materials of the thermal transfer layers in the first transfer sheet and the second transfer sheet may be the same or different. The thermal transfer layer of the first transfer sheet is not particularly limited as long as it is a thermoplastic resin and can be thermally bonded to the adherend. For example, ethylene-vinyl acetate resin, vinyl acetate resin, acrylic resin And urethane-based resins, vinyl chloride-based resins, polyester-based resins, and the like. Further, a resin obtained by blending these as appropriate can also be used. As the thermal transfer layer of the second transfer sheet, the same thermoplastic resin as the thermal transfer layer of the first transfer sheet can be used.

The pressure-sensitive adhesive layer is a layer containing a pressure-sensitive adhesive, and the pressure-sensitive adhesive is preferably such that it can be attached to the thermal transfer layer of the first transfer sheet only by overlapping it. And vinyl acetate-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. An acrylic pressure-sensitive adhesive is preferable in consideration of water resistance, light resistance, and durability. Further, in the present invention, a re-peelable and re-attachable pressure-sensitive adhesive that can be appropriately re-applied as needed when bonding to the print layer on the first transfer sheet may be used.

As an adherend for thermally transferring an image, a cloth,
There is no particular limitation as long as the heat transfer layer such as paper, wood, leather, plastic, etc. is a heat-bondable adherend. For example, simple chairs such as T-shirts, jeans, bags, zuks, denim, wallpaper, and ornamental materials Materials such as a picture and a curtain are included.

The thickness of the thermal transfer layer may be the same or different in the first transfer sheet and the second transfer sheet.
The thickness is not particularly limited, but the coating amount is preferably from 1 to 50 g / m ² , and particularly preferably from 5 to 30 g / m ² , in terms of dry weight. If the amount is less than 1 g / m ^2, poor thermal transfer is likely to occur, and if it is more than 50 g / m ² , the texture of the adherend after thermal transfer is reduced.

The thickness of the adhesive layer is 1 to 50 g / m ² , particularly preferably 5 to 30 g / m ² . 1 g / m ²
If the amount is less than 50 g / m ² , the texture of the adherend after thermal transfer is reduced.

The image can be created by printing such as gravure printing or silk screen printing, or by using a printer such as a dot printer or a thermal transfer printer. Since the thermally-transferred image is sandwiched between the thermal transfer layers of the first and second transfer sheets, it is possible to obtain washing resistance even if the image is made of ink having low water resistance. There are features.

Examples of a coating method for forming a thermal transfer layer and / or an adhesive layer on a substrate include a comma coater, a blade coater, a bar coater, a roll coater, a die coater, an extrusion coater and the like.

In the present invention, a first transfer sheet is formed by providing a thermal transfer layer on a substrate. Next, a thermal transfer layer and an adhesive layer are provided on the base material to form a second transfer sheet, and a release material is overlaid on the adhesive layer for convenience of handling.

The thermal transfer in the present invention is shown in FIGS.
This is performed as shown in (d). That is, an image is printed on the thermal transfer layer 3 of the first transfer sheet 1 by an appropriate printing method (FIG. 2A). Next, the release paper of the second transfer sheet is peeled off, and the adhesive layer 8 is superimposed on the surface of the thermal transfer layer 3 of the first transfer sheet (FIG. 2B), and the first adhesive sheet is used by using the adhesive layer. The transfer sheet and the second transfer sheet are stuck together. Thereafter, the substrate 2 of the first transfer sheet is peeled off, the thermal transfer layer 3 is overlaid on the adherend 10 (FIG. 2C), and heat is applied from the side of the substrate 6 to form the image forming layer 11. After the thermal transfer to the adherend, the substrate 6 is peeled off, so that a normal image is transferred. The image forming layer 11 includes a heat transfer layer, a print image, an adhesive layer, and a heat transfer layer in this order from the adherend side, and the print image is sandwiched between upper and lower heat transfer layers. Further, the adhesive layer may be mixed with the thermal transfer layers above and below the printed image to be integrated. Therefore, if a heat transfer layer or an adhesive layer having excellent light resistance and durability is used, the light resistance and durability of a printed image are improved.

[0023]

EXAMPLE First, a first transfer sheet and a second transfer sheet were prepared. Glassine paper white 70 g / m ² (manufactured by Lintec Corporation) was used as a base material of the first transfer sheet, and 100 parts by weight of ethylene-vinyl acetate resin “B-154” (manufactured by Koyo Chemical Co., Ltd.) was further added. And a resin for a thermal transfer layer consisting of 1 part by weight of silicone oil "SH-29PA" (manufactured by Toray Dow Corning Co., Ltd.) was applied by a comma coater so that the application amount was 20 g / m < ² > in dry weight. Next, it was dried by heating at 100 ° C. for 60 seconds to form a thermal transfer layer.

Glassine paper white 70 g / m ² (manufactured by Lintec Corporation) was used as a base material of the second transfer sheet, and an ethylene-vinyl acetate resin “B-154” (manufactured by Koyo Chemical Co., Ltd.) was further placed thereon. ) "SH29PA" of 100 parts by weight of silicone oil (as the coating amount becomes 15 g / m ² by dry weight using a comma coater Dow Corning Toray Co., Ltd.) thermal transfer layer resin composed of 0.5 part by weight It was applied and heated and dried at 100 ° C. for 60 seconds to form a thermal transfer layer.

On top of that, an acrylic adhesive "BPS-
1004 parts by weight of "5448" (manufactured by Toyo Ink Mfg. Co., Ltd.), 5 parts by weight of "BXX5134" (manufactured by Toyo Ink Mfg. Co., Ltd.) and 20 parts by weight of toluene were mixed with a comma coater. Coating is performed so that the coating amount is 10 g / m ^{2 in} dry weight.
Heat drying was performed for 0 seconds to form an adhesive layer. A second transfer sheet was produced by laminating a release paper on the adhesive layer.

Next, the image was thermally transferred to a T-shirt as follows. First, a normal image was printed on the thermal transfer layer of the first transfer sheet by a thermal transfer printer to form a print layer.
Next, the release paper of the second transfer sheet was peeled off, the adhesive layer and the thermal transfer layer of the first transfer sheet were overlapped, and the image was transferred onto the adhesive layer to form a mirror image. Then, the thermal transfer layer exposed by peeling the base material of the first transfer sheet was overlapped on a predetermined position of the T-shirt, heated with an iron, and the image was thermally transferred onto the T-shirt. Finally, the base material of the second transfer sheet was peeled off to form a normal image on the T-shirt.

The obtained image has excellent water resistance because the printing layer is between the two thermal transfer layers, and also has excellent durability against external light because the printing layer is covered with the adhesive layer. Was something.

[0028]

According to the present invention, when the first transfer sheet and the second transfer sheet are bonded, an adhesive is used instead of heat bonding, so that the transfer to the adherend is completed by one heat transfer. And
Workability was able to be improved. Further, according to the present invention, since the printing layer is sandwiched between the two heat transfer layers having water resistance, not only water from the surface but also water from the adherend can be prevented, and the water resistance is excellent. I was Also, since the printing layer was covered with the adhesive layer, it was excellent in light resistance and durability.

[Brief description of the drawings]

FIG. 1A illustrates a first example of a thermal transfer sheet of the present invention.
(B) is a cross-sectional view showing a state in which the transfer sheet is printed.
FIG. 4 is a sectional view of a second transfer sheet.

FIGS. 2A and 2B are cross-sectional views schematically showing a thermal transfer method according to the present invention, wherein FIG. 2A shows a state where printing is performed on a first transfer sheet, and FIG. (C) shows a state where the image is thermally transferred to the adherend, and (d) shows a state where an image is formed on the adherend.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first transfer sheet 2 base material 3 thermal transfer layer 4 printing layer 5 second transfer sheet 6 base material 7 thermal transfer layer 8 adhesive layer 9 release material 10 adherend 11 image constituent layer

Claims (3)

[Claims] 1. A thermal transfer sheet comprising a first transfer sheet and a second transfer sheet, wherein the second transfer sheet has an adhesive layer on a surface. 2. A thermal transfer sheet comprising a first transfer sheet and a second transfer sheet, wherein the first transfer sheet has a structure comprising a substrate and a thermal transfer layer in this order, and wherein the second transfer sheet comprises A thermal transfer sheet having a structure comprising a substrate, a thermal transfer layer, and an adhesive layer in this order. 3. A step of forming an image on the first transfer sheet, a step of bonding the surface of the first transfer sheet on which the image is formed to an adhesive layer of the second transfer sheet, and a step of attaching the image. Thermally transferring to a body.