JPS6117661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves feeding a printed pattern support sheet, which supports a transferably activated desired pattern on one side of the thin film, with its pattern side up, onto a solution of the thin film; In so-called curved surface printing, in which a pattern is transferred onto a sheet by applying the transfer object to a sheet on this solution, wrinkles that occur when the sheet contacts the solution surface and swells are prevented, which hinders the transfer work. We are trying to prevent this from happening.

FIG. 1 shows the wrinkle generation state. As shown in the figure, when the printed pattern support sheet 8 comes into contact with the solution surface of the thin film, the thin film is rapidly swollen by the solution, and a constriction A is created at the part after contact with the solution. A large number of wrinkles B are generated inwardly along the sheet traveling direction. It is considered that the wrinkles B occur because the sheet spreads rapidly due to swelling of the thin film. Then, as the sheet is run, some of these wrinkles persist B' to the transfer position. This is further facilitated by the fact that the activated pattern on the sheet is sticky.

The occurrence of wrinkles is more pronounced in the case of wider sheets. If the wrinkles persist up to the transfer position, the pattern will be distorted and cannot be used for transfer. Conventionally, in order to prevent the formation of wrinkles, the flow of the dissolving solution is slowed down or the flow of the solution is changed. However, these methods are not preferred because they complicate the mechanism of the liquid flow generator.

The present invention has been made in view of the above points. In other words, when the sheet touches the liquid surface and begins to swell, the airflow pushes down several parts of the sheet into the water and stretches the sheet to prevent wrinkles from forming and to prevent problems with transfer. This is what I am trying to do.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows an outline of the entire transfer device. In the figure, S is a pattern support sheet that supports a desired pattern on one surface of a thin film such as polyvinyl alcohol. This sheet is a roll of 10
The solvent coating device 12 is used to draw out the liquid from the solvent coating device 12 .

The solvent coating device 12 includes a gravure cylinder 14, an impression cylinder 16, a pan 18 for storing solvent, a doctor 20, etc., and the patterned surface of the sheet S is coated with a solvent here. As a result, the ink of the pattern on the sheet S is activated and becomes sticky, making it possible to transfer it to an object.

Note that gravure ink is stored in the pan 18 of the solvent coating device, and at the same time other patterns, colors, etc. are added to the pre-printed pattern, the pattern is activated using this gravure ink. You can also do it. Alternatively, the roll 10 may be used as a single thin film to be coated with a pattern for the first time in the solvent coating device 12, and then fed as a printed pattern support sheet S to the next step.

As described above, the sheet with the activated pattern passes through the reversing roll 22 and is then sent to the suction roll 24 with the pattern surface facing upward. The suction roll 24 has a large number of small holes or slits (not shown) on its surface, and as it rotates, it sucks the bottom surface of the sheet S and transfers the sheet to the dissolving liquid 2.
It is intended to be sent in six directions. The sheet S brought from the suction roll 24 is then guided along the guide member 28 onto the surface of the solution with its thin film side facing down. The sheet S travels on the liquid surface while being swollen by the action of the dissolving liquid. Then, the transfer object 30 is applied to the sheet S at a position C where the thin film is swollen and softened to the extent that it does not interfere with the transfer.

The transfer object 30 is submerged in the liquid together with the sheet S, and the sticky pattern of the sheet is adhered by the action of the liquid pressure.

During this time, the solution 26 is flowing on its surface by the liquid flow generator 32. Therefore, the sheet S can run smoothly on the liquid surface. Here, when the sheet S is brought to the surface of the solution containing the thin film, wrinkles B' appear as shown in the first diagram.
To prevent this, air H is blown out at several locations in the width direction of the sheet toward the portion where the sheet swells and spreads on the surface of the solution. This blown air H
Specifically, it is applied on the dashed line D or the dashed line E in FIG. 1 or between them. The sheet is undulated and stretched by this air flow H, and as a result, wrinkles are prevented.

The above-mentioned jet air H is jetted from a nozzle 34 having a large number of small holes arranged in a pipe as shown in the second figure. The nozzle 34 is connected to the suction roll 24 in a ventilated manner and is held on a tank 35, and a suction pump P and a discharge amount adjusting valve 36 are provided in the middle of the connection.

Therefore, the exhaust gas from the suction roll 24 is ejected from the nozzle 34 and discharged from above the chain lines D and E toward the upper surface of the sheet, causing the sheet to wave, thereby stretching the sheet and removing wrinkles. It acts on The adjustment valve 36 is adjusted depending on the degree of wrinkle B' elimination.

The nozzle 34 may be a pipe with a slit, or a commercially available nozzle may be attached to a small hole in the pipe.
Further, in the above embodiment, since the nozzle 34 and the suction roll 24 are connected, there is an advantage that the nozzle and the suction roll can be operated by providing only one suction pump. The present invention is not limited to this, and the nozzle and suction roll can be connected to separate actuation sources.

In this way, the sheet with wrinkles prevented is the third
As shown in the figure, it is fed to a transfer position C and subjected to transfer.

Therefore, according to the present invention, since the generation of wrinkles can be prevented, a pattern that does not interfere with the transfer operation can be obtained even when a wide sheet is used. Moreover, the liquid flow generating device can also be of a simple mechanism.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a sheet with wrinkles, FIG. 2 is a schematic side view of a transfer device, and FIG. 3 is a plan view of a sheet in which wrinkles are prevented by use of the present invention. B, B'...Wrinkle, S...Sheet, H...Blowout air flow, 24...Suction roll, 26...Dissolving liquid, 34...Nozzle, 36...Flow rate adjustment valve.

Claims (1)

[Scope of Claims] 1. A printed pattern support sheet supporting a transferably activated desired pattern on one side of the thin film is fed onto a solution of the thin film with its pattern side facing up;
In the method of transferring the pattern to the transfer object by applying the transfer object to the sheet on the dissolving liquid, applying a jet of air in the width direction of the sheet after the sheet is fed to the dissolving liquid surface. A method for preventing wrinkles in a printed pattern support sheet, which prevents wrinkles from occurring in the running direction of the sheet. 2. In a transfer device that performs transfer by running a printed pattern support sheet supporting a desired transferably activated pattern on one surface of the thin film by a suction roll and bringing it into a tank storing a solution of the thin film. . An apparatus for preventing wrinkling of a printed pattern support sheet, characterized in that a nozzle is provided above the position where the sheet is fed to the surface of the solution in the tank to spray air over the entire width of the sheet. 3. The wrinkle prevention device for a printed pattern support sheet according to claim 2, wherein the nozzle is supplied with exhaust air from a suction roll.