JP2000158894A - Thermal transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a loss of air permeability of a base even in the case of transferring to the base having the permeability such as a clothing by remarkably reducing a product cost with good productivity. SOLUTION: The thermal transfer sheet is obtained by laminating an image layer on a mold release sheet 1, and laminating a heat fusible adhesive layer 3 on the layer 2. The layers 2 and 3 can be made to have air permeability. Further, the sheet 1 may be formed as a transparent synthetic resin film, or a toner image layer obtained by fixing the layer 2 by an electrostatic copier.

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 capable of easily transferring designs, characters, and the like to various substrates such as cloth, paper, and wood.

[0002]

2. Description of the Related Art Conventionally, a thermal transfer sheet capable of transferring toner images such as various designs and characters fixed on a release sheet by an electrostatic copying machine using toner onto cloth, paper, wood, or the like has been developed. Exists.

In this thermal transfer sheet, a thermosetting adhesive layer is laminated on the toner image layer in order to fix toner images such as various designs and characters, and a thermofusible adhesive layer is further formed on the thermosetting adhesive layer. An adhesive layer is laminated so that toner images such as various designs and characters can be easily transferred to cloth, paper, wood, and the like.

[0004]

However, in the above-described conventional thermal transfer sheet, a thermosetting adhesive is screen-printed to laminate the thermosetting adhesive layer on the toner image layer. In order to laminate the hot-melt adhesive layer on the thermosetting adhesive layer, the following operation steps are required. In other words, it is necessary to spray the powder of the hot-melt adhesive over the entire screen-printed surface and dry at a low temperature for a long time before the surface of the screen-printed thermosetting adhesive is dried and a film cannot be formed. It is necessary to remove the hot-melt adhesive powder that has scattered in addition to the screen-printed surface, and then fuse and fix the hot-melt adhesive powder that has been spread all over the screen-printed surface. .

Therefore, in the above-mentioned conventional thermal transfer sheet,
Laminating a thermosetting adhesive layer on the toner image layer, and further laminating a hot-melt adhesive layer on the thermosetting adhesive layer, is very complicated, resulting in poor productivity and extremely low cost of the thermal transfer sheet. Had the problem of becoming expensive.

Further, in the above-mentioned conventional thermal transfer sheet, a thermosetting adhesive layer is laminated on the toner image layer, and a hot-melt adhesive layer is further laminated on the thermosetting adhesive layer. If you transfer large designs or characters to breathable clothing, etc. There was a problem of lowering product value.

Accordingly, the present invention has been made to solve the problems of the above-mentioned conventional thermal transfer sheet, and has as its object to provide a thermal transfer sheet which has good productivity and can make the product cost very low. It is a thing. In addition, the present invention provides a thermal transfer method which has good productivity, can make the product cost very low, and does not lose the air permeability of the base material even when transferred to a base material having air permeability such as clothes. The purpose is to provide a seat.

[0008]

Therefore, the thermal transfer sheet of the present invention comprises an image layer 2 laminated on a release sheet 1;
The hot-melt adhesive layer 3 is laminated on the image layer 2.

Further, in the thermal transfer sheet of the present invention, the image layer 2 and the hot-melt adhesive layer 3 can have air permeability.

Further, in the thermal transfer sheet of the present invention, the release sheet 1 can be a transparent synthetic resin film.

In the thermal transfer sheet of the present invention, the image layer 2 can be a toner image layer fixed by an electrostatic copying machine.

In the thermal transfer sheet of the present invention having the above-described structure, the steps of the laminating operation are simplified, and the productivity is improved. Further, in the thermal transfer sheet of the present invention, when the image layer 2 and the hot-melt adhesive layer 3 are made to have air permeability, the image layer 2 and the hot-melt adhesive layer 3 are transferred to an air-permeable base material such as clothes. Even so, the air permeability of the substrate is not lost.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the thermal transfer sheet of the present invention will be described below in detail with reference to the drawings.

FIG. 1 schematically shows a cross section of a thermal transfer sheet according to the present invention. In the thermal transfer sheet according to the present invention, an image layer 2 is laminated on a release sheet 1, And a hot-melt adhesive layer 3 is laminated thereon.

The release sheet 1 is formed by forming a release layer 1b of silicone oil or the like on one surface of a sheet substrate 1a such as paper or a transparent synthetic resin film having little dimensional change. By making the release sheet 1 a transparent synthetic resin film, for example, a transparent polyester film, the breathable image layer 2 can be seen through, so that it is convenient to determine the transfer position during the transfer operation. In addition, the breathable image layer 2
When the consumer selects the color of the breathable image layer 2 or the details of the pattern, the selection can be made accurately.

When the image layer 2 is made to have air permeability, various patterns and characters such as characters fixed on the release sheet 1 by a monochrome or color electrostatic copying machine using toner are used. Although the image layer can be formed as an image layer, the image layer may be formed as a fine material by other various printing methods. When the image layer 2 is used as a toner image layer, an original design can be easily created by copying a snapshot from a photograph, a pictorial book, or a magazine.

The hot-melt adhesive layer 3 may be transparent or opaque, but may be a simple substance such as a polyurethane resin, a polyester resin, an acrylic resin, or a polyamide resin, or a copolymer thereof. . In the embodiment, in order to make the hot-melt adhesive layer 3 air-permeable, 35% by weight of polyurethane resin and 35% by weight of acrylic resin
% By weight, a copolymer comprising 30% by weight of a polyamide resin, and 3% by weight of an epoxy resin,
2% by weight of a cross-linking agent, 3% by weight of a cell stabilizer described later, 3% by weight of a thickener, and the like were blended. In order to form such a hot-melt adhesive layer 3, when the resin is in a moderately thickened state, bubbles are mechanically forcibly mixed into the resin to increase the magnification of the resin liquid to 1.5 to 2 times or more. Then, this is screen-printed on the image layer 2 and immediately dried. The bubbles mixed into the resin liquid are single bubbles, but the bubbles mixed into the resin in the drying step expand, and at the same time as the bubbles are removed from both sides of the resin film before the resin liquid is formed into a film, Micro open cells are formed in the resin film,
It becomes the hot-melt adhesive layer 3 having air permeability. In order to mechanically forcibly mix air bubbles into the resin in the moderately thickened state,
Use a mechanical foaming machine or a homogenizer. Further, in order to stabilize the bubbles that have been forcibly mixed, a bubble stabilizer (for example, foam stabilizer YC-81 manufactured by Nippon NS Co., Ltd.) is added in advance.

Next, a process of transferring a pattern, a character, or the like to a breathable substrate such as clothing using the thermal transfer sheet of the present invention will be described.

As shown in FIG. 2, the thermal transfer sheet of the present invention is placed on a cloth 11 such as a tea shirt with the hot-melt adhesive layer 3 facing down. Then, in this state, when pressure bonding is performed at a temperature of about 100 ° C. for about 10 seconds using a transfer-specific pressing machine or iron, the image layer 2 penetrates into the hot-melt adhesive layer 3 as shown in FIG. Thereafter, the release sheet 1 is peeled off from the image layer 2 as shown in FIG. By doing so, the cloth 11 such as a tea shirt is placed on the cloth 11 as shown in FIG.
As shown in the above, for example, the English letter "A" can be transcribed.

[0020]

Since the thermal transfer sheet of the present invention is constructed as described above, the steps of the laminating operation are simplified, the productivity is high and the product cost is very low. Furthermore, when the image layer and the hot-melt adhesive layer have air permeability, the thermal transfer sheet of the present invention loses the air permeability of the substrate even when the image layer and the hot-melt adhesive layer are transferred to an air-permeable substrate such as clothing. It did not cause the texture of the cloth to deteriorate, or to give a comfortable feeling to the clothes.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a cross section of a thermal transfer sheet of the present invention.

FIG. 2 is an explanatory view schematically showing a transfer step using the thermal transfer sheet of the present invention.

FIG. 3 is an explanatory view schematically showing a transfer step using the thermal transfer sheet of the present invention.

FIG. 4 is an explanatory view schematically showing a transfer step using the thermal transfer sheet of the present invention.

FIG. 5 is an explanatory diagram showing a state in which the thermal transfer sheet of the present invention has been transferred to a tee shirt.

[Explanation of symbols]

 1 release sheet 2 image layer 3 hot-melt adhesive layer

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Claims (4)

[Claims] 1. A thermal transfer method comprising laminating an image layer (2) on a release sheet (1) and laminating a hot-melt adhesive layer (3) on the image layer (2). Sheet. 2. An image layer (2) and a hot-melt adhesive layer (3).
2. The device according to claim 1, wherein said material has air permeability.
The thermal transfer sheet as described in the above. 3. The thermal transfer sheet according to claim 1, wherein the release sheet (1) is a transparent synthetic resin film. 4. The image layer according to claim 1, wherein said image layer is a toner image layer fixed by an electrostatic copying machine.
Or the thermal transfer sheet according to 3.