JP2002321336A - Intaglio rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intaglio rotary press printable well without producing blank stain (fog) even if printing is conducted at high speed. SOLUTION: The intaglio rotary press is provided with an ink supplying means 15 for attaching ink 20 to a plate face 11a having a concavo-convex face, a scraping means 13 for scraping off the ink 20 attached on a convex part excepting the ink 20 in the concave parts of the plate face 11a, a transfer means 12 for conducting printing by transferring the ink 20 in the concave parts of the plate face 11a to an object to be printed 30, and an ink volume reducing means 14 abutting against the plate face for 11a, for removing in advance the residual ink 20 to be scraped off by the scraping means, and for reducing the ink volume to be scraped off by the scraping means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intaglio printing press such as a gravure printing machine for transferring ink attached to a concave image portion on a printing plate to a printing object and printing the same.

[0002]

2. Description of the Related Art FIG. 4 is a view showing a conventional gravure printing press, and FIG. 5 is an enlarged view showing a plate cylinder and a doctor of the conventional gravure printing press. The gravure printing machine 10 adheres the ink 20 supplied from the ink pan 16 via the furnisher roller 15 to the plate surface 11 a of the plate cylinder 11. Then, the doctor 13 scrapes off excess ink 20 adhering to the non-image portions (projections) while leaving the ink 20 at the image portions (recesses) of the plate surface 11a. Then, the ink 20 in the image area is transferred to the printing object 30 passed between the impression cylinder 12 and printing is performed.

When the printing speed is low, the doctor 13
Thus, the surplus ink 20 adhering to the non-image area can be scraped off (FIG. 5A). However, printing speed increased,
When the rotation speed of the plate cylinder 11 increases, the amount of the ink 20 conveyed on the plate surface 11a increases, and the ink 13
Is pushed up, and the amount of the ink 20 that passes through the plate surface 11a without being scraped off by the doctor 13 increases (FIG. 5B). Thus, the ink 20 in the non-image area
If it cannot be completely removed, a phenomenon (so-called "fogging") that a picture or a white background is slightly stained may occur. For this reason, conventionally, the amount of ink is adjusted by adjusting the number of revolutions and the pressing pressure of the furnisher roller 15 for adhering the ink 20 to the plate surface 11a.
Is increased to oppose the force pushing up the doctor 13.

[0004]

However, even if the number of revolutions and the pressing pressure of the furnisher roller 15 are adjusted, the ink film thickness on the printing plate surface is reduced particularly due to the low viscosity of the gravure ink. The film thickness changes greatly with changes in roller rotation speed and pressing pressure.
Insufficient ink on the plate surface is likely to occur, and there is a possibility that printing failure may occur. Also, the doctor 13 is attached to the plate 11a.
The doctor 13 is required to have such a flexibility that the excess ink 20 can be scraped off by following the minute irregularities of the plate surface 11a even if the force of pressing the doctor 13 is increased. The tip portion becomes bent, making it difficult to completely prevent fog (FIG. 5).
(C)).

[0005] An object of the present invention is to provide an intaglio rotary press capable of printing neatly without causing slight stain (fogging) on a white background even when printing at high speed.

[0006]

The present invention solves the above-mentioned problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. In order to solve the above-mentioned problem, the invention according to claim 1 includes an ink supply means (15) for attaching ink (20) to a plate surface (11a) having irregularities, and an ink (20) in a concave portion of the plate surface (11a). , And printing is performed by transferring the ink (20) in the concave portion of the plate surface (11a) to the printing object (30) by scraping means (13) for scraping the ink (20) attached to the convex portion. An intaglio rotary press including a transfer unit (12), wherein an excess ink (20) that comes into contact with the plate surface (11a) and is scraped by the scraping unit (13) is removed in advance, and the scraping is performed. An intaglio rotary press comprising an ink amount reducing means (14) for reducing the scraping amount of the means (13).

According to a second aspect of the present invention, in the intaglio printing press according to the first aspect, the ink amount reducing means (14) is installed such that a contact side with the printing plate (11a) is higher than an opposite side. It is an intaglio rotary press characterized by the following.

[0008]

Embodiments of the present invention will be described below in more detail with reference to the drawings. (First Embodiment) FIG. 1 is a view showing a first embodiment of a gravure printing machine according to the present invention, and FIG. 2 is an enlarged view showing a plate cylinder, a doctor and an ink amount reducing plate. Note that the same reference numerals are given to portions that perform the same functions as those of the above-described conventional example, and redundant description will be omitted as appropriate. The gravure printing machine 10 includes a plate cylinder 11, an impression cylinder 12, a doctor 13,
An ink amount reducing plate 14, a furnisher roller 15,
An ink pan 16 is provided.
Print.

The plate cylinder 11 has an image portion (recess) of the plate surface 11a.
The printing is performed on the printing object 30 by placing the ink 20 on the printing object 30. The impression cylinder 12 presses the printing object 30 against the plate surface 11a to transfer the ink 20 in the image area. Doctor 1
No. 3 scrapes off excess ink 20 adhering to the non-image area (projection) of the plate surface 11a. The doctor 13 is a thin steel plate having such flexibility that the surplus ink 20 can be scraped off following the minute irregularities of the plate surface 11a.

The ink amount reducing plate 14 removes a certain amount of the excess ink 20 in advance before the surplus ink 20 is scraped off by the doctor 13 to reduce the amount of ink scraped by the doctor 13. The ink amount reducing plate 14 is disposed upstream of the doctor 13. The ink amount reducing plate 14 can be the same as the doctor 13, and is, for example, a thin steel plate similar to the doctor 13.

The furnisher roller 15 is a rubber roller that supplies the ink 20 from the ink pan 16 to the plate surface 11a, and has a role of forcibly transferring the ink 20 of the ink pan 16 to the plate surface 11a.

The ink pan 16 is a part for storing the ink 20. The apparatus uses gravure ink. The gravure ink is low in viscosity and rich in fluidity, and has the property that ink setting is performed by evaporation and drying, and is suitable for high-speed printing.

The gravure printing press 10 operates as follows. The furnisher roller 15 rotates in the direction of arrow A (clockwise rotation), and the ink 20 of the ink pan 16
1a. At this time, the plate cylinder 11 rotates in the arrow B direction (left rotation). Ink 2 supplied to plate 11a
In the state of 0, a certain amount is removed by the ink amount reducing plate 14 and further scraped off by the doctor 13 to remain in only the image area and not adhere to the non-image area (FIG. 2). reference). Then, in this state, the printing target 30 is supplied in the direction of arrow C and is pressed by the impression cylinder 12 that rotates (rotates clockwise) in the direction of arrow D. Thus, the ink 20 is transferred to the printing target 30 and printed.

According to this embodiment, the ink amount reducing plate 14 is used.
Is provided, the doctor 13 does not increase the amount of ink to be removed even when the printing speed increases. for that reason,
An increase in the force for pushing up the doctor 13 by the ink 20 can be prevented, the pressing pressure of the doctor 13 does not decrease, and the occurrence of fog can be prevented.

(Second Embodiment) FIG. 3 is an enlarged view showing an ink amount reducing plate of a gravure printing machine according to a second embodiment of the present invention. Note that the same reference numerals are given to portions that perform the same functions as in the above-described first embodiment, and overlapping descriptions will be omitted as appropriate. In this embodiment, the ink amount reducing plate 14 is used.
As shown in FIG. 3, is mounted such that the blade end in contact with the plate surface 11a is higher than the blade end on the opposite side.

According to the present embodiment, since the blade end in contact with the plate surface 11a is mounted so as to be higher than the opposite blade end, the excess ink 20 removed by the ink amount reducing plate 14 is removed. It is possible to flow without accumulating between the doctor 13 and the ink amount reducing plate 14 and the ink 20 can be smoothly circulated.

(Modifications) Various modifications and changes are possible without being limited to the above-described embodiment, and they are also within the equivalent scope of the present invention. For example, in the above-described embodiment, the case where the number of the ink amount reducing plates 14 is one has been described as an example. However, the number of the ink amount reducing plates 14 may be increased as necessary.

[0018]

As described above in detail, according to the first aspect of the present invention, the excess ink which is brought into contact with the plate surface and scraped by the scraping means is removed in advance, and the scraping amount of the scraping means is removed. Is provided, the occurrence of fog can be prevented even when the printing speed increases.

According to the second aspect of the present invention, the ink amount reducing means is provided so that the side in contact with the printing plate is higher than the opposite side, so that the ink can be circulated smoothly.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a gravure printing machine according to the present invention.

FIG. 2 is an enlarged view showing a plate cylinder, a doctor, and an ink amount reducing plate according to the first embodiment.

FIG. 3 is an enlarged view showing an ink amount reducing plate of a second embodiment of the gravure printing machine according to the present invention.

FIG. 4 is a view showing a conventional gravure printing machine.

FIG. 5 is an enlarged view showing a plate cylinder and a doctor of a conventional gravure printing press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gravure printing machine (intaglio rotary press) 11 Plate cylinder 11a Plate surface 12 Impression cylinder 13 Doctor 14 Ink amount reducing plate 15 Furnisher roller 16 Ink pan 20 Ink 30 Print target

Claims (2)

[Claims] 1. An ink supply means for attaching ink to a plate surface having irregularities, a scraping means for scraping ink attached to a convex portion while leaving ink in a concave portion of the plate surface; An intaglio rotary press including a transfer unit that transfers a print to an object to be printed, wherein the ink that comes into contact with the plate surface and is scraped by the scraping unit is removed in advance, and the scraping unit removes the ink. An intaglio rotary press comprising an ink amount reducing means for reducing the amount of ink. 2. The intaglio printing press according to claim 1, wherein the ink amount reducing unit is installed such that a contact side to the printing plate surface is higher than an opposite side thereof.