JPS6058716B2 - Transfer printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to transfer printing on three-dimensional objects such as curved objects.

Regarding transfer to a three-dimensional object, there have been several conventional methods, and the following methods are common as methods that have recently attracted particular attention.

The method uses a three-dimensional object, a transfer sheet, and a liquid tank. Briefly, a transfer sheet made by printing a pattern on a thin film is floated on a liquid in a liquid tank. A three-dimensional object held by a holding mechanism is placed on top of it, and when the three-dimensional object placed on the holding mechanism is submerged in liquid in a liquid tank with a transfer sheet interposed, liquid pressure is applied to the entire three-dimensional object. Since the pressure is applied uniformly, the transfer is performed by the pressure applied.

However, in this method, the three-dimensional object to be transferred is directly submerged in a liquid tank with a transfer sheet interposed between them.
Only the J liquid pressure in the liquid tank is applied to the transferred object, which may result in a slight lack of pressure.Also, since the transfer sheet is floated directly on the liquid, the transfer sheet made of a thin film is applied to the liquid in the liquid tank. Various problems may occur unless the relationship between the material of the transfer sheet and the properties of the liquid is fully understood so that the liquid does not cause abnormalities. The conventional method has the above-mentioned drawbacks, and it has not been easy to perform the transfer operation smoothly. The present invention solves the above-mentioned drawbacks of the conventional method by applying a stretchable thin film such as a rubber film to the liquid or gas surface in a tank containing liquid or gas to prevent deterioration of the transfer sheet. By providing a pressure device such as a pump and applying pressure with the pressure device, it is attempted to solve the problem of poor transfer due to insufficient pressure. The present invention will be explained in detail below with reference to the drawings. As shown in FIG. 1, a retractable thin film 3 is stretched over the top of a tank 4 having a pressurizing device 7, and a liquid or gas 5 is filled inside the tank. Next, a desired pattern is applied to the flexible sheet using paint, printing ink, etc. to form a transfer sheet 2, which is placed on a stretchable thin film. The configuration of this transfer sheet is such that if at least one of the flexible sheet and the paint or printing ink has releasability, good transfer can be performed with just the sheet and the pattern. Even when using a non-coated sheet, paint, printing ink, or the like, or even when using a sheet with releasable properties, providing a release varnish layer between the sheet and the pattern will allow for more complete transfer.

Further, if an adhesive layer is provided on the pattern layer, the transfer can be performed more easily. Next, the object 1 to be transferred is placed on the transfer sheet, and as shown in FIG. When a predetermined pressure is applied to the liquid or gas in the tank by the device, uniform pressure is applied to the entire transfer area of the transfer target through the stretchable thin film, and even minute irregularities on the surface of the transfer target are applied. The transfer sheet adheres tightly, allowing for perfect transfer.

Thereafter, by taking out the transfer object from the tank and removing the flexible sheet, the pattern on the transfer sheet can be faithfully reproduced on the surface of the transfer object.

Although transfer is possible by simply applying pressure due to the effects of flexible sheets, paints, printing inks, releasable varnish layers, adhesive layers, etc., transfer is made easier and more complete by heating. In such cases, it is effective to heat the liquid or gas in the tank.

The heating method includes a method in which preheated liquid or gas is sent into the tank using a pressurizing device and mixed with or replaced with the liquid or gas previously placed in the tank; A heating device is installed in the tank to heat the liquid or gas already in the tank, and then the object to be transferred is pushed into the tank. One possible method is to push the body into the tank. It is also possible to heat the transfer sheet and the object to be transferred in advance. There are cases where you can leave it as is. As a result, for example,
In the case of a transfer sheet using a thermoplastic sheet 1, the sheet is softened by heating and adheres well to the finely uneven surface of the object to be transferred. Next, each component of the present invention will be explained.

The object to be transferred is mainly a three-dimensional object with an uneven surface such as wood, metal, plastic, or other molded objects, but of course it is not limited to this.
It also includes three-dimensional objects or flat plates that consist only of smooth surfaces.

Any flexible sheet can be used as long as it is flexible and printable; for example, polyethylene sheets, polypropylene sheets, vinyl chloride sheets, polyester sheets, nylon sheets, etc. can be used.

Patterns include letters, symbols, wood grain patterns, abstract patterns,
You can arbitrarily select from various patterns such as marble pattern.

The stretchable thin film may be any natural rubber, synthetic rubber, or other sheet that stretches with a relatively small amount and has a relatively large amount of stretch.

As described above, the method of the present invention uses a stretchable thin film stretched over the top of the tank and a pressurizing device installed in the tank.
This prevents deterioration of the transfer sheet and compensates for the pressure during transfer, allowing complete transfer to three-dimensional objects with fine irregularities on the surface.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing one embodiment of the present invention. Fig. 1 is an explanatory diagram of a state in which a transfer sheet is placed on a thin film and a transfer target is set in a predetermined position, and Fig. 2 is an explanatory diagram of a state in which a transfer sheet is placed on a thin film and a transfer target is set in a predetermined position. Explanatory views of the body being pushed into the tank are shown. 1... Transferred object, 2... Transfer sheet,
3...Stretchable thin film, 4...tank, 5
...Liquid or gas, 6...Support, 7
・・・・・・Pressure device.

Claims (1)

[Claims] 1. A transfer sheet, which is a flexible sheet with a pattern applied to it using paint, printing ink, etc., is placed on a device in which a stretchable thin film is stretched over the top of a tank containing liquid or gas. The printed side is placed on the thin film, and then the object to be transferred is pressed against the transfer sheet and pushed into the premises. The pattern is transferred onto the surface of the transfer object by applying a predetermined pressure to the liquid or gas in the transfer object, applying pressure uniformly over the entire transfer area of the transfer object, and then covering the flexible sheet. A transfer printing method characterized by removal from the surface of the transfer material. 2. The transfer printing method according to claim 1, characterized in that the liquid or gas in the tank is preheated, or mixed or replaced with the preheated liquid or gas. 3. The transfer printing method according to claim 1, wherein pressure is applied by a pressurizing device at the same time as pushing the transferred object into the tank while heating the liquid or gas in the tank. 4. The transfer printing method according to claim 1, 2, or 3, characterized in that the transfer sheet is heated in advance. 5. The transfer printing method according to claim 1, 2, or 3, characterized in that the object to be transferred is heated in advance. 6. The transfer printing method according to claim 1, 2, or 3, characterized in that the transfer sheet and the object to be transferred are heated in advance.