KR20030025994A - Offset printer and etching printing method using the offset printer - Google Patents

Abstract

PURPOSE: An offset printer and an etching printing method using the same are provided to achieve improvement in the printing speed and height of the characters printed on the paper. CONSTITUTION: An offset printer comprises a cylinder(12) where an ink is applied; a blanket(14) where the ink is transferred from the cylinder while the blanket is contacting the cylinder; and a press cylinder(16) for transferring printing paper in such a manner that the ink transferred to the blanket is printed on the printing paper while the printing paper is contacting the blanket. The blanket has an outer surface where a double-sided tape(18) is attached, and the double-sided tape has an outer surface where a resin plate(22) is attached, to thereby permit the blank to be used as a printing plate.

Description

Offset printer and etching printing method using the offset printer}

The present invention relates to an etching printing by an offset printing method which can be represented as silk printing by an offset printing method.

The offset printing method uses a printer consisting of a paper feeder, a printing device, a wet water device, an ink supply device, and a discharge device, as shown in FIG. This high part and the non-flammable part make the part with low affinity for ink, so that water and ink are buried together on the plate surface so that the ink adheres to the sensitive fraud part, and the non-flammable part is protected by a thin layer of water (condensate, damp water). No ink is attached. In this way, the water and oil repel each other and print using the properties. In this way, the ink on the wire portion of the printing plate is transferred to the elastic rubber-coated cylinder (blanket), which is illustrated in FIGS. 2 and 3. As described above, the printing paper is transferred from here to printing paper.

The offset printing method does not form a clear outline due to the small amount of ink delivery, but it can reproduce the printed material with a soft feeling, and the adhesion of ink on the bottom plate is good, making the printing plate easier and more stable than other plates, and the dot reproducibility is good. Because of the advantage of easy color printing, offset printing is now commonplace.

Etching prints are embossed on the printed surface to obtain a print that feels as if touched by hand. It is mainly used in gold or silver to give a sense of quality for the packaging of liquor, medicine, and cosmetics. It is done.

However, silk etching ink in the silkscreen etching printing has to reduce productivity and increase cost due to excessive ink use, delay in drying, and lowering of machine operation speed, and have sufficient working time and working space.

Therefore, in order to reduce mass production and cost by etching printing, the offset printing method that can be applied to the automatic drying method that is dried at the same time as the offset printing rather than the silk screen method should be used. In other words, the automatic printing drying method can be used only in the offset printing method as a decoration that hardens and dries the printing surface by irradiating UV light at the same time using UV etching ink to prevent backing.

Etch printing by the silk screen method has a disadvantage in that a small amount of production, excessive use of ink and a long working time.

The present invention is to solve the problems as described above, to develop a transfer material for transferring the etching ink to the printing material by using an offset printing machine and the offset printing method using a blanket as a printing plate as a component of the printing device. In providing.

1 is a conceptual diagram of general offset printing.

2 and 3 are schematic diagrams showing the structure and principle of offset printing.

4 is a structural diagram of a blanket used in offset printing according to the present invention.

5 is a conceptual diagram of offset printing to which a blanket is applied according to the present invention.

<Explanation of symbols by main parts of the drawings>

11: plate barrel 12: plate barrel

13: blanket cylinder roller 14: blanket

16: pressure tender 18: double-sided tape

20: printing paper 22: resin plate, flexo plate

The present invention is a plate through which the ink is buried to achieve the above object; A blanket in which the ink buried in the plate is transferred while being in contact with the plate; An offset printing machine having a printing device comprising a presser for conveying printing paper so that ink transferred to the blanket can be printed on the printing paper while contacting the blanket, wherein the double-sided tape is attached to the outer circumference of the blanket, Resin or flexo plate is attached to the outer periphery of the tape to provide an offset printing machine characterized in that the blanket is used as a printing plate.

The present invention provides an offset printing machine, characterized in that the resin plate or flexo plate attached to the outer circumference of the blanket is attached only to the portion necessary for the outer circumference of the blanket in order to achieve the above object.

The present invention comprises the steps of being buried in ink in the whole plate by the ink roller to achieve the above object; Transferring ink to a line portion of a blanket in which a printing plate buried in the whole plate is installed; The ink transferred to the line of the blanket is imprinted on the printing paper passing between the blanket and the tender; It provides an etching printing method by an offset printing machine comprising the step of drying the printing paper transfer the ink transfer by UV automatic drying method.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 5, the offset press according to the present invention, as in the prior art, includes a paper feeder, a printing device (plate, blanket, presser), an ink supply device (ink roller), and a discharge device. The structure is changed to enable etching printing.

The printing apparatus is engaged with the blanket cylinder 13 on which the ink is buried by the ink roller for transferring ink and the blanket 14 on which the ink of the sheet is transferred, and the blanket cylinder 13 wound thereon to rotate. It consists of the impression cylinder 16.

The outer circumference of the conventional plate 12 is divided into a wire line and a non-wire line, and a corroded plate (print plate) in which the printing shape is designed is wound, and ink is selectively buried by the repulsive action of water and oil. Irrespective of the fire line and non-fire line, all of them become non-fire line and the ink is buried as a whole.

The ink buried in the printing plate of the plate 12 as described above is transferred to the blanket 14 by the rotation of the plate, the structure of the conventional blanket 14 is also referred to as a rubber blanket because the rubber plate is formed around the outer periphery, In FIG. 4, the structure of the blanket 14 is formed by winding a resin plate 22 or a flexo plate 22 instead of a rubber plate on an outer circumference thereof.

Referring to the structure of the blanket according to the present invention in more detail as shown in Figure 4, the double-sided tape 18 is attached to the outer periphery of the blanket 14, the resin plate 22 or flexo plate 22 is wound thereon Glue them together. Here, the resin plate 22 and the flexographic plate 22 design the printing shape by etching (divided into a line portion and a non-line portion) to serve as a printing plate (transition material) in which ink wrapped in a conventional plate is buried.

The resin plate 22 and the flexo plate 22 can be attached over the entire outer circumference of the blanket 14, and can be attached only to a part of the sheet as needed.

Since the resin plate 22 or flexo plate 22 attached as described above is manufactured to have a thickness greater than the thickness of the printing plate wound on the existing plate, the etching depth formed on the resin plate 22 or the flexo plate 22. You can also deepen. Therefore, the printing paper 20 imprinted by the resin plate 22 or the flexographic plate 22 exhibits practical effects such as silk screen etching printing.

As described above, in the state of printing by the resin plate 22 or the flexographic plate 22, a UV etching printed matter of the offset printing method is obtained by using the UV automatic drying method as before.

Looking at the etching printing process by the offset printing machine according to the present invention as shown in Figure 5, the ink is buried in the whole plate by the ink roller, the ink is transferred to the line portion of the blanket is installed, the printing plate buried in the whole plate, After the ink transferred to the line of the blanket is printed on the printing paper passing between the blanket and the tender, the printing paper on which the ink is transferred is dried by UV automatic drying.

As described above, in the present invention, a plate is used as a printing plate. In the present invention, a blanket is used as a printing plate. However, in the conventional offset printing, the height of the etching printing surface which is formed on the printing surface is about 0.4 μm to 0.6 μm, but the present invention can be realized. In offset printing according to the above, the height of the etching printed surface of about 10 μm can be obtained. In other words, it was not possible to improve the height of the etched print surface up to 20㎛ like the conventional silkscreen printing, but it has increased productivity to several times due to the rapid printing which is the advantage of offset printing in printing speed while increasing to about 10㎛.

Claims (3)

A pan barrel in which ink is buried; A blanket in which the ink buried in the plate is transferred while being in contact with the plate; In the offset printing machine having a printing device comprising a tender for conveying the printing paper so that the ink transferred to the blanket can be printed on the printing paper while contacting the blanket, And a double-sided tape attached to the outer circumference of the blanket, and a resin plate or a flexo plate attached to the outer circumference of the double-sided tape so that the blanket is used as a printing plate. The method of claim 1, A resin plate or flexo plate attached to the outer circumference of the cylinder is attached to only the portion necessary for the outer circumference of the blanket. Buried with ink in the whole plate by the ink roller; Transferring ink to a line portion of a blanket in which a printing plate buried in the whole plate is installed; The ink transferred to the line of the blanket is imprinted on the printing paper passing between the blanket and the tender; Etching printing method according to the offset printing machine comprising the step of drying the printing paper transfer the ink by UV automatic drying method.