JPS6054185B2 - Wrinkling prevention device for printed pattern support sheet in curved surface printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wrinkle prevention device for a printed pattern support sheet in a curved surface printing device.

A printed pattern support sheet supporting a transferably activated desired pattern on one side of the thin film is fed with the pattern side facing upward onto the surface of a dissolving solution having a property of dissolving the thin film, In curved surface printing, in which the pattern is transferred and printed onto the object by applying the object to the sheet on the surface of the solution, wrinkles occur when the sheet swells in contact with the surface of the solution. It becomes a hindrance to work.

To further explain this using figures, in Figure 1,
S is a pattern support sheet that supports a desired transfer ink pattern on one side of polyvinyl alcohol or the like, and this sheet S is usually in the form of a roll 10.

The sheet S pulled out from the roll 10 in the direction of the arrow passes through a solvent coating device 12 and is coated with a solvent to activate its ink pattern so that it can be printed. 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 sheet s is coated with a solvent by the gravure cylinder 14.

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.

In addition, the roll 10 is configured with only a thin film, and the solvent coating device 1
The pattern may be applied for the first time in Step 2, and then the printed pattern support sheet S may be sent to the next step. The sheet S, on which the pattern has been activated as described above, 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 circumferential surface, and while rotating, sucks the lower surface of the sheet S and sends the sheet toward the surface of the dissolving liquid 26 . The sheet S brought from the suction roll 24 is then guided along the guide member 28 with the thin film side facing down on the surface of the solution.

The dissolving liquid 26 is a liquid having the property of forming a thin film on the pattern support sheet S, is usually water, and is contained in a liquid tank 30. The sheet S floats on the surface of the solution 26 and moves on the surface of the solution while being swollen by the action of the solution.

Then, at position C, where the thin film is swollen and softened to the extent that it does not interfere with transfer,
The transferred material 32 is lowered from above toward the upper surface of the sheet S. As a result, the transferred object 32 is submerged in the liquid together with the sheet S, and the sticky pattern of the sheet is adhered to the surface of the transferred object 32 by the action of the hydraulic pressure. During this period, the dissolving liquid 26 is supplied to the liquid flow generator 34.
Therefore, a flow is formed on the surface in the direction of the arrow, so that the sheet S can smoothly move on the liquid surface.

However, when the sheet S is placed on the surface of the solution 26, wrinkles A appear as shown in FIG. Ru.

To further explain this, when the sheet S comes into contact with the surface of the solution 26, the thin film swells rapidly with the solution, creating a constriction B at the part that comes in contact with the solution, and a constriction B is created inside the sheet S along its traveling direction. Many wrinkles A occur. It is thought that the occurrence of wrinkles is due to the rapid spreading of the sheet due to swelling of the thin film. Then, as the sheet is further run, some of these wrinkles persist up to the transfer position C, as shown by A''. This is because the activated pattern on the sheet becomes 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, and is designed to stretch the sheet by partially pushing it down into the water using an air flow when the sheet touches the liquid surface and starts to swell. Furthermore, the direction and amount of air flow can be freely adjusted to prevent wrinkles from occurring and to prevent problems with transfer.

Hereinafter, an embodiment of the present invention will be described. In FIG. 1,
40 is a pipe fixed above the liquid tank 30;
is supported by a suitable support device (not shown).

As shown in FIG. 3, air is supplied into the tube 40 by a pump P and piping 42, and this air is pumped from the tube 40 onto the pattern support sheet S on the solution 26 as described below. is injected to. This air injection is performed at several locations in the width direction of the sheet at the portion where the sheet S swells and spreads on the surface of the solution, specifically along the chain line X-X in Figure 2. Or on or between the dashed line Y-Y. The sheet S is undulated and stretched by this air flow, and as a result, wrinkles are prevented from forming. In addition, in the example of FIG. 1, one air pipe 4
0 is provided, but as shown in FIG.
0A can be further provided to perform air injection using two air pipes. In this case, the air tube 40 injects air toward the X-X position in FIG. 2, and the air tube 40A injects air toward the Y-
It is preferable to inject air toward the Y position. Furthermore, by connecting the suction side of the pump P mentioned above to the suction roll 24 as shown in FIG.
One pump can suck air from the suction roll and supply it to the air pipe. The air is jetted onto the pattern support sheet S from the air pipes 40 and 40A as follows:
This is done by an air injection pipe 44 shown in FIG.

This air injection pipe 44 is arranged along the longitudinal direction of the air pipes 40, 40A, that is, along the width direction of the sheet S, as schematically shown in FIG. 3. Each injection pipe 44 is made of a flexible material such as copper or aluminum, and its base end is attached to the air pipe 40, 40A by screwing or any other method, and there is a valve in the middle for adjusting the amount of air. 46 are provided. It is preferable that the middle of the injection pipe 44 be bent into a loop shape as shown in the figure. When operating this printed pattern support sheet wrinkle prevention device, the flexibility of each injection tube 44 is adjusted so that the air injection direction and injection intensity from the air injection tube 44 are as shown in FIG. Use this to determine the orientation and adjust the opening degree of 46.

This work is performed while checking the occurrence of wrinkles on the sheet S. As can be seen from FIG. 5, the tip of the injection tube 44 is made to face outward as it reaches the widthwise outer side of the sheet S, and the injection force increases as it reaches the widthwise center of the sheet S. Ru. By giving an outward component to the direction of the jet flow from the outer jet pipe 44, the sheet S receives a force that stretches it outward in the width direction, and wrinkles disappear. In addition,
In FIGS. 1 and 3, reference numeral 48 is a control valve 48, and the overall amount of air injected from the injection pipe 44 is changed by adjusting the opening degree thereof.

The sheet S from which wrinkles have been removed in the manner described above is sent to a position C shown in FIG. 1 and subjected to transfer.

As described above, according to the present invention, it is possible to prevent the occurrence of wrinkles on the printed pattern support sheet by jetting air, and in this case, the direction of the air jet tube and the amount of air jetted can be freely changed. Therefore, it is possible to obtain the optimum air injection condition depending on the wrinkle occurrence situation of the sheet. Furthermore, in the present invention, if the air injection pipe is provided in accordance with the widest seat width, when the seat width is narrow, the injection width corresponding to the seat width can be obtained by closing the valve of the outer injection pipe. There is also the advantage of being able to BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic longitudinal cross-sectional view showing a curved surface printing device in which the wrinkle prevention device of the present invention is applied, and FIG. 2 is a plan view showing a state in which wrinkles have occurred in the printed pattern support sheet. , FIG. 3 is a plan view of the apparatus of the present invention, FIG. 4 is an enlarged partial cross-sectional view taken along the line ■-■ in FIG. 3, and FIG. be.

S...Printed pattern support sheet, A...Wrinkles, B...
Flange, C...Transfer position, 10...Roll of printed pattern support sheet, 12...Solvent coating device, 24...
・Suction roll, 26...Dissolution liquid, 32...Transferred material, 40...Air pipe, P...Pump, 44...
- Air injection pipe, -46... valve, 48... regulating valve.

Claims (1)

[Scope of Claims] 1. A printed pattern support sheet that supports a transferably activated printed pattern on one side of the thin film is placed above a liquid tank containing a thin film solution into which a printed pattern support sheet is fed into the solution. A large number of air injection pipes whose injection direction can be freely adjusted are provided for injecting air over the entire width of the seat surface in the area where the sheet surface starts to come into contact with the seat surface, and each air injection pipe is provided with a valve that can freely adjust the amount of air to be ejected. A wrinkle prevention device for a printed pattern support sheet in a curved surface printing device. 2 Claim 1 in which the air injection tube is a flexible tube
A device for preventing wrinkling of a printed pattern support sheet as described in 2. 3. The wrinkle prevention device for a printed pattern support sheet as set forth in claim 1 or 2, wherein the valve is provided in the middle of the air injection tube, protruding from a common air tube for each of the air injection tubes. 4. The wrinkle prevention device for a printed pattern support sheet according to claim 1, wherein the air injection tube is provided in a plurality of rows at intervals in the running direction of the printed pattern support sheet.