JP2002019752A - Pattern transfer method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a degree of transfer accuracy when a pattern is transferred to a planar object of transfer using a transfer sheet, by improving release properties between the transfer sheet and the object of transfer. SOLUTION: A work 1 is held on a base 2. A support frame 3 is provided around the base 2. A transfer sheet 10 is fixed on the frame 3 by the outer periphery of the sheet 10 so as to be opposed to the work 1 across a closed space 20. An air feed hole 25 is formed in the frame 3, and the hole 25 is connected to a compressed air source 27. When ink placed on the surface of the sheet 10 is transferred onto the work 1, a press roll 5 is rotated on the rear side of the sheet 10, while air is blown from the hole 25 into a closed space 20 between the work 1 and the sheet 10. Thus, the sheet 10 is deflected along the outer periphery of the roll 5, while the sheet 10 is separated from the work 1 on the rear side of the roll 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern transfer method and apparatus for transferring a plane pattern onto a flat transfer object, and more particularly, to transferring a flat pattern onto a large transfer object with high accuracy. And an apparatus for the same.

[0002]

2. Description of the Related Art As a method of transferring a planar pattern onto a flat transfer object (hereinafter referred to as a work) with high accuracy,
Screen printing and transfer sheet methods are known.

In the transfer sheet method, ink or an ink-like paste (hereinafter, simply referred to as ink) is provided on the surface of the transfer sheet, and then the transfer sheet is pressed from the back side to the work to be pressed by a flat surface using the ink. The pattern is transferred onto the work.

FIG. 5 shows an outline of a conventional pattern transfer apparatus using a transfer sheet. The work 1 is held on a base 2. A support frame 3 is provided around the base 2,
The transfer sheet 4 is fixed on the support frame 3 at its peripheral edge. As a result, the transfer sheet 4 is opposed to the work 1 with a slight clearance,
Is held above. By rolling the press roll 5 on the back surface side of the transfer sheet 4, the surface of the transfer sheet 4 is pressed against the work 1, and the plane pattern of the ink is transferred onto the work 1.

(Problems of the prior art) In a conventional pattern transfer apparatus using a transfer sheet, the clearance between the work and the transfer sheet is reduced when the ink has a high adhesive strength or for the purpose of increasing the transfer accuracy. In this case, when the press roll 5 is rolled on the back surface side of the transfer sheet 4, as shown in FIG. 5, a portion where the transfer sheet 4 remains in close contact with the work 1 may remain behind the press roll 5. is there. In an extreme case, as shown in FIG. 6, the transfer sheet 4 may not come off while being in close contact with the entire surface of the work 1. When such a phenomenon occurs, stripes occur in the transferred pattern, or the positional accuracy of the pattern decreases due to a change in transfer conditions.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional pattern transfer method using a transfer sheet as described above, and an object of the present invention is to provide a transfer method using a transfer sheet. A pattern transfer method capable of improving the releasability between a transfer sheet and a transfer target when transferring a flat pattern to a transfer target, thereby transferring the flat pattern to a large transfer target with high accuracy. And a device.

[0007]

According to the pattern transfer method of the present invention, a peripheral portion of a transfer sheet having a pattern formed of ink or ink-like paste formed on the surface is fixed with a support frame, and the surface of the transfer sheet is fixed. In a pattern transfer method of transferring a pattern to a transfer object by facing a flat transfer object with a slight clearance, rolling a press roll on the back surface of the transfer sheet, and transferring the pattern to the transfer object. A closed space is formed between the transfer sheet and the transfer sheet, and air is blown into the closed space to maintain a pressure on the front side of the transfer sheet higher than that on the back side. Rolling, whereby the transfer sheet is separated from the object to be transferred on the rear side of the press roll.

According to the pattern transfer method of the present invention, since the pressure on the front side of the transfer sheet is maintained higher than that on the rear side, a force for pushing the transfer sheet upward acts. Therefore, when the press roll is rolled on the back surface of the transfer sheet, the transfer sheet is deformed so as to bend along the outer periphery of the press roll behind the press roll.
Therefore, the transfer sheet can be reliably separated from the transfer target immediately after passing through the press roll.

The pattern transfer device according to the present invention
By forming a closed space between the transfer object and the transfer sheet, forming an air supply path to the closed space, and blowing air into the closed space through the air supply path, the transfer sheet It is configured to maintain the pressure on the front side higher than on the back side.

[0010]

FIG. 1 shows an outline of a transfer sheet used in the pattern transfer method of the present invention.

The transfer sheet 10 includes a base sheet 11 and
It is composed of a soft surface layer 12 laminated thereon.
In this example, the base sheet 11 is a steel sheet having a thickness of 0.3 mm, and the surface layer portion 12 is a rubber sheet having a thickness of 0.7 mm. An intaglio type pattern portion 13 is provided in a region inside the surface layer portion 12, and a fine groove for filling with ink is formed.

A flexible portion 15 is provided on the base sheet 11 so as to surround the surface layer portion 12. The flexible portion 15 has a large number of holes penetrating the base sheet 11. These holes are all closed by a rubber film, and block the flow of air above and below the base sheet 11. In this way, the flexible portion 15 is attached to the base sheet 11.
Is configured to be elastically deformed with a small force as compared with the peripheral portion. As the flexible portion 15 expands and contracts,
The surface layer portion 12 can move in a direction perpendicular to the surface of the base sheet 11.

FIG. 2 shows an outline of a transfer apparatus used in the pattern transfer method of the present invention. The work 1 is held on a base 2. A support frame 3 is provided around the base 2, and the transfer sheet 10 is fixed on the support frame 3 at a peripheral portion of the base sheet 11. As a result, the transfer sheet 10 is held above the work 1 in a state where the transfer sheet 10 is opposed to the work 1 via a slight clearance, and a closed space is formed between the work 1 and the transfer sheet 10.

FIG. 3 shows the structure of the support frame 3 to which the peripheral edge of the base sheet 11 is fixed. The support frame 3 has a substantially U-shaped cross-sectional shape, and has flange portions 3a, 3b parallel to each other.
And a web portion 3c connecting between them. The support frame 3 is mounted on the base 2 along the periphery of the base 2 in a posture in which the web portion 3c is parallel to the vertical direction. A pad 21 made of a porous material is buried in the center of the upper surface of the upper flange portion 3a in parallel with the longitudinal direction, and a sealing material 22 is buried on both sides in parallel with the pad 21. Upper flange portion 3a
In the portion corresponding to the back side (lower side) of the pad 21,
An intake path 23 is provided. By exhausting the pad 21 from the back side through the intake path 23, the peripheral portion of the base sheet 11 is adsorbed and fixed to the surface of the pad 21.

The web portion 3c of the support frame 3 has a through hole 25
(Hereinafter, referred to as air supply holes). This air supply hole 25 is connected to a compressed air source 27 via a pipe 26.

When transferring the ink pattern provided on the surface of the transfer sheet 10 to the work 1, the closed space 2 between the work 1 and the transfer sheet 10 is transferred as shown in FIG.
While blowing air from the air supply hole 25 into 0,
The press roll 5 is rolled on the back side of the transfer sheet 10. By blowing air to increase the pressure in the closed space 20 to, for example, about 200 Pa (G),
A force that pushes the transfer sheet 10 upward acts on the lower surface of the transfer sheet 10. Thereby, the transfer sheet 10 is deformed so as to bend along the outer periphery of the press roll 5, and the transfer sheet 10 is separated from the work 1 on the rear side of the press roll 5.

In this manner, the transfer sheet 10 can be reliably separated from the work 1 immediately after passing through the press roll 5. Thereby, when the pattern is transferred onto the work 1, the contact state between the press roll 5 and the transfer sheet 10 is maintained at a constant state, and the fluctuation of the stress state acting on the transfer sheet 10 can be suppressed to be small. As a result, according to the pattern transfer method of the present invention, high pattern transfer accuracy can be realized.

FIG. 4 shows another embodiment of the present invention. The peripheral edge of the base sheet 11 is fixed to a movable frame 28, and the transfer sheet 10 is formed integrally with the movable frame 28. Is to be disengaged.

The present invention is not limited to the above example, but can be implemented with various modifications. For example, the transfer sheet 10 is integrally fixed to the support frame 3, and the support frame 3 is
May be configured to be disengageable with respect to.

[0020]

According to the pattern transfer method of the present invention, when a flat pattern is transferred onto a transfer object using a transfer sheet, the transfer sheet can be reliably separated from the transfer object immediately after passing through a press roll. . As a result, it is possible to transfer a planar pattern onto a large transfer object with high accuracy.

Further, according to the pattern transfer method of the present invention, an ink having a large adhesive strength can be used. 100 μm, width several tens μm to several hundred μm
Good results can also be obtained when transferring a planar pattern with fine ribs.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a transfer sheet used in a pattern transfer method according to the present invention.

FIG. 2 is a diagram showing an outline of a pattern transfer device according to the present invention.

FIG. 3 is a diagram illustrating a structure of a support frame to which a transfer sheet is fixed.

FIG. 4 is a diagram showing another example of a method for fixing a transfer sheet.

FIG. 5 is a diagram showing an outline of a conventional pattern transfer device.

FIG. 6 is a diagram illustrating a state in which a transfer sheet is in close contact with a work in a conventional pattern transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Work, 2 ... Base, 3 ... Support frame, 4 ... Transfer sheet, 5 ... Press roll, 10 ... Transfer sheet, 11 ... Base sheet, 12 ...・ Surface layer part, 13 ・ ・ ・ Pattern part, 15 ・ ・ ・ Flexible part, 20 ・ ・ ・ Sealed space, 21 ・ ・ ・ Pad, 22 ・ ・ ・ Seal material, 23 ・ ・ ・ Air intake path, 25 ・ ・ ・Air supply holes, 26: piping, 27: compressed air source, 28: movable frame.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Shogo Serizawa, Inventor 2068-3, Ooka, Numazu, Shizuoka Pref. F term (reference) 3E095 AA01 BA10 CA10 DA42 DA90 FA06 FA21

Claims (2)

[Claims] 1. A peripheral edge portion of a transfer sheet having a pattern formed of ink or ink-like paste formed on a surface thereof is fixed by a support frame, and the surface of the transfer sheet is slightly cleared with respect to a flat transfer object. In a pattern transfer method in which a press roll is rolled on the back surface of the transfer sheet to transfer the pattern to a transfer target, a closed space is formed between the transfer target and the transfer sheet. Blowing air into the enclosed space, while maintaining the pressure on the front side of the transfer sheet higher than the back side, rolling the press roll on the back side of the transfer sheet,
A pattern transfer method, wherein a transfer sheet is separated from an object to be transferred on a rear side of a press roll. 2. A transfer sheet having a pattern formed of ink or ink-like paste formed on a surface thereof and having a peripheral portion fixed by a support frame, the surface of which is separated from a flat transfer object by a slight clearance. In a pattern transfer device that rolls a press roll on the back surface of the transfer sheet in a state where the transfer sheet is opposed to the transfer sheet, and transfers the pattern to the transfer object, a closed space is formed between the transfer object and the transfer sheet. By forming an air supply path to the closed space and blowing air into the closed space via the air supply path, the pressure on the front side of the transfer sheet is maintained higher than that on the back side. A pattern transfer device.