JP3015958B2 - Engraving intaglio printing machine with electron beam irradiation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention obtains an engraved intaglio printed matter mainly used for banknotes, passports, securities, cards, etc., which are required to prevent forgery and falsification. It relates to an engraving intaglio printing press for printing.

[Conventional technology]

Banknotes, passports, securities, stamps, and the like are required to be hard to forge or falsify in nature. As a general countermeasure for preventing forgery, it is widely practiced to provide anti-counterfeiting by performing engraving intaglio printing. This engraved intaglio print has a swelling of ink on the image of several tens of μm, which can be immediately discriminated by touching with hand, and also provides a very clear image, and is also used for art prints.

The image depth of the intaglio, which is usually used in engraving intaglio printing up to now, is about 100 μm, but the actual transfer to the paper after the ink has been deposited and printed is the ink inside the At most 30-40%. However, since the amount of transfer to the paper is extremely large compared to other printing methods, drying of the ink after printing, especially the set-off where the ink adheres to the back side of the paper discharged next in the paper discharge section Was a problem.

[Problems to be solved by the invention]

In the intaglio printing machine for printing engraved intaglio printing described in the related art, conventionally, a waxed paper called an interleaving paper or the like is interposed so that the ink does not adhere to the back surface of the paper discharged next in the paper discharging section. Insertion was used to prevent set-off, or to increase the cohesive strength of the ink or add wax to prevent set-off.However, inserting the slip-sheet requires a lot of trouble removing the slip-sheet after printing. And increase the cohesion of the ink,
Further, in the case of inks to which wax has been added, set-off cannot be completely prevented, and these have caused printing troubles.

The present invention is different from these printing means, in the state where the paper is in close contact with the plate immediately after intaglio printing, by irradiating the back side of the paper with an electron beam of, for example, about 150 to 300 kV,
The ink in the printing plate image was cured and completely transferred to the paper, so that an engraved intaglio print having a complete drawing shape was obtained. To perform such printing, it is necessary to install an electron beam irradiator directly on the plate cylinder of the intaglio printing press. However, when using an electron beam irradiator, the electron beam and its secondary X-rays are shielded. There is a need to.

However, the currently developed 150-300kV self-shielding type
In low-energy electron beam irradiation equipment, leakage of secondary X-rays due to electron beam irradiation is prevented by providing a gradient at the entrance and exit of the irradiation target of the irradiation equipment and completely closing all other parts. However, in the printing press of the present invention, since it is necessary to irradiate an electron beam in a state where the printing medium is in close contact with the plate cylinder, it is necessary to install an irradiation device in contact with the plate cylinder and immediately after the impression cylinder. Also, since the plate cylinder needs to be provided with various devices around it, it needs to have a considerably large diameter and rotates at a high speed, so that it is difficult to seal the whole, so that the electron beam and the secondary X-ray are hardly sealed. Very difficult to shield. The present invention provides an electron beam irradiator for irradiating an electron beam directly on a plate surface in contact with a plate cylinder of an intaglio printing press. It is an object of the present invention to provide an intaglio printing machine equipped with an electron beam irradiation device provided with a shielding mechanism for preventing the leakage of an electron beam, and an electron beam and secondary X-ray shielding mechanism.

[Means for solving the problem]

In order to achieve the above object, in the present invention, as an engraving intaglio printing machine, an ink filling device for applying ink to a plate surface around a plate cylinder, wiping to wipe off excess ink on a non-image portion of the plate surface. Equipment, an impression cylinder for transferring the ink inside the image to the printing medium such as paper, and an electron beam irradiator for drying and curing the ink immediately after the installation, and printing on the ink on the plate surface with the impression cylinder Immediately irradiating an electron beam from the back side of the printing medium while the body is in close contact with the printing medium so that the ink in the printing area is cured and the entire amount of ink in the printing area can be transferred to the printing medium. Become.

In the present invention, the leakage of secondary X-rays due to electron beam irradiation, which is a problem at this time, is achieved by using a pair of lead-lined shield rollers, which are also used as sheet pressers, before and after the electron beam extraction window of the electron beam irradiation apparatus. It is installed so as to be in contact with the cylinder, and a shielding plate is provided behind each roller. The roller and the shielding plate are used for shielding secondary X-rays in the rotation direction of the plate cylinder. And alternately providing shielding plates on the plate body to prevent leakage of secondary X-rays in the side direction of the plate cylinder, and further step on the body frame lined with lead inside, By providing the lead projection on the frame side of the irradiation device, the entire structure can be shielded by the structure in which the electron beam irradiation device can be moved. Further, shielding of X-rays in the direction of the inside of the plate cylinder of the printing press becomes possible by lining a lead layer inside the plate cylinder.

[Action]

The engraved intaglio printing machine equipped with an electron beam drying device obtained by the above method enables the ink in the printing plate to be completely transferred to the paper and at the same time completely hardens the ink, so that intaglio printing can be performed very efficiently. Can be done,
By transferring all the ink in the printing plate image to the paper, it is possible to obtain a printed material having much better ink coverage and a unique feel than ordinary intaglio printed materials, and having extremely difficult forgery and falsification. Such prints cannot be obtained with a conventional intaglio printing machine.

In addition, since only the plate cylinder portion of the printing press that rotates at high speed can be shielded compactly by the shielding mechanism of the present invention, it is not necessary to seal the ink filling device and the wiping device that need to be adjusted during the operation of the printing press. Excellent workability.

〔Example〕

 Embodiments will be described below with reference to the drawings.

As an embodiment, around the plate cylinder (1) as shown in FIG. 1, an ink filling device (2), a wiping device (3), an impression cylinder (4), and an electron beam immediately after the impression cylinder (4). An irradiator (5) is installed, ink is applied to the plate surface on the plate cylinder (1) from an ink inking unit (2), and excess ink in the non-image area is wiped off by a wiping device (3). Impression cylinder (4)
To transfer the ink in the object to the printing medium (6), and immediately thereafter, irradiate the electron beam with an electron beam irradiation device (5) to cure the ink and transfer to the printing medium (6). Let it.

As shown in FIGS. 3 and 4, the electron beam irradiation device (5)
A lead layer (11) around an iron core (12) as shown in FIG. 5 and a thin heat-resistant rubber layer (13) around the core (12) as shown in FIG. A pair of paper holding and shielding rollers (7) is installed, and a shielding plate (19) is provided behind each roller. The rollers (7) and the shielding plate (19) are used for shielding X-rays, and Leakage of secondary X-rays caused by irradiation in the rotational direction of the plate cylinder can be prevented. The shielding plate (19) is the frame (8) of the printing press body
(8 ') and frame of electron beam irradiation device (16) (16')
By inserting a groove into the groove, leakage of secondary X-rays from the gap can be prevented.

As shown in FIG. 2 and FIG. 7, the printing drum body side direction is arched by the arched shields (9) and (9 ') installed on the printing machine body frames (8) and (8') and the printing cylinder (1). By providing circle-type shields (10) and (10 ') alternately overlapping with the mold shields (9) and (9'), leakage of X-rays in the side direction of the plate cylinder is prevented, and furthermore, maintenance of the electron beam irradiation device For the electron beam irradiation device frame (1
6) (16 ') has a structure in which it can be moved back and forth on the electron beam irradiation device moving rail (18) of the body frame, and the inside of the body frame (8) lined with lead (14) as shown in FIG. ) (8 ') and the frame of the electron beam irradiation device (16)
The joint of (16 ') is formed by inserting a lead protrusion (15) having a taper into the main frame (8).
The joint between (8 ') and the electron beam irradiation device frame (16) (16') is shielded, and the space between the electron beam irradiation device (5) itself and the electron beam irradiation device frame (16) (16 ') is shielded. By shielding each with a ring-shaped lead seal plate (17), the entire electron beam irradiation device can be shielded.

〔The invention's effect〕

By the engraving intaglio printing machine with the electron beam drying device of the present invention,
Since the ink in the printing pattern can be completely transferred to the paper and at the same time the ink can be completely cured, the intaglio printing can be performed very efficiently, and all the ink in the printing pattern can be transferred to the paper. Thus, a printed material having a much higher ink coverage and a unique feel than ordinary intaglio printed materials can be obtained. It is difficult to obtain such a printed matter by using an ordinary intaglio printing machine.

In addition, since only the plate cylinder portion of the printing press that rotates at high speed can be shielded compactly by the shielding mechanism of the present invention, it is not necessary to seal the ink filling device and the wiping device that need to be adjusted during the operation of the printing press. Excellent workability.

As described above, the engraving intaglio printing machine equipped with the electron beam irradiation device of the present invention can be used for a printing plate surface in a product that requires countermeasures to prevent counterfeiting, alteration, and authenticity of banknotes, passports, securities, cards, and the like. Because the ink in the wire can be completely transferred to the paper, the ink level is much better than that of ordinary intaglio prints, and it has a unique feel, making it possible to obtain prints that are extremely difficult to forge and falsify. It is possible to provide a printed material that can be authenticated.

[Brief description of the drawings]

1 is an explanatory view of the inside of an engraving intaglio printing machine with an electron beam irradiation device as viewed from the side, FIG. 2 is an enlarged top view of a main part of FIG. 1, and FIG. 3 is a view from the electron beam irradiation device side. FIG. 4 is an explanatory view of the assembly of the periphery of the plate cylinder, FIG. 4 is an explanatory view of the assembly of the electron beam irradiation apparatus viewed from the plate cylinder side, and FIG. FIG. 6 is a partially enlarged sectional view of a shielding mechanism between the main body frame and the electron beam irradiation apparatus frame, and FIG. 7 is an enlarged sectional view of a shielding mechanism between the plate cylinder and the main body frame. . DESCRIPTION OF SYMBOLS 1 ... Plate cylinder 2 ... Ink coating device 3 ... Wiping device 4 ... Impression cylinder 5 ... Electron beam irradiation device 5 '... Electron beam extraction window of electron beam irradiation device 6 ... Printed object 7 ... … Sheet roller that also serves as paper presser 8 …… Printer body frame 8 ′ …… Printer body frame 9 …… Arch shield 9 ′ …… Arch shield 10 …… Circle shield 10 '…… Circle shield 11… Lead lining layer 12 Iron core 13 Heat resistant rubber film 14 Lead layer 15 Lead projection 16 Electron beam irradiation device frame 16 'Electron beam irradiation device frame 17 Lead seal plate 18 …… Electron beam irradiation device frame moving rail 19 …… Lead shielding plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-14500 (JP, A) JP-A-57-193393 (JP, A) JP-A-60-90762 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B41F 9/00 B41F 23/04 B41M 7/00

Claims (2)

(57) [Claims] An electron beam irradiator is provided which is movable in contact with the plate cylinder immediately after the impression cylinder, and irradiates an electron beam from the back side of the print body in a state where the print body is in close contact with the ink in the printing surface. In the engraving intaglio printing machine with an electron beam irradiation device, a pair of rollers lined with lead are installed before and after the electron beam extraction window of the electron beam irradiation device so as to be in contact with the plate cylinder, and at the same time, behind each of the rollers. A shielding plate is installed on the main body of the printing press to shield in the rotation direction of the printing cylinder. Performing, the inside is stepped on the main body frame lined with lead, and a lead protrusion is provided on the frame side of the electron beam irradiation device in a structure that can move the electron beam irradiation device, and the entire electron beam irradiation device is Perform shielding And the electron beam and the electron beam irradiation device with intaglio printing press, characterized in that a shielding mechanism for preventing the leakage to the surroundings of the secondary X-ray. 2. A shielding mechanism provided in an engraving intaglio printing machine equipped with an electron beam irradiation device for preventing leakage of electron beams and secondary X-rays around the electron beam irradiation window, wherein the electron beam extraction window of the electron beam irradiation device is provided. A pair of rollers lined with lead so as to be in contact with the plate cylinder before and after is installed, and at the same time, a shield plate is installed behind each of the rollers to shield in the rotational direction of the plate cylinder. A shielding plate is installed by alternately overlapping the frame and the plate body to shield in the lateral direction of the plate cylinder, and the inside of both the frame of the main body frame and the frame of the electron beam irradiation device is made of lead. After lining, it is stepped on the main body frame, and a lead protrusion is provided on the frame side of the electron beam irradiation device to shield a joint between the main body frame and the frame of the electron beam irradiation device. A rail for moving the electron beam irradiation device is installed on the main body frame so that the electron beam irradiation device can be moved on the rail, and the electron beam irradiation device itself and the electron beam irradiation device are used. A ring-shaped lead seal plate provided between the frames to shield the entire electron beam irradiation apparatus.