JPH0270435A - Plate cylinder device of intaglio - Google Patents

Abstract

PURPOSE:To obtain a high quality plate cylinder reusable and suitable for printing a modest number of sheets by so providing a thermally-melting type filler in a cell formed on a plate surface that the volume of said filler is changed in correspondence to the density of an image by a laser. CONSTITUTION:A uniform cell 15 is etched with the depth (t) in a network on the plate surface of a plate cylinder 6, so that the whole plate surface is in a solid state at the printing time. Then, a filler 16 of thermally-melting type is applied all over the plate surface. The filler 16 is such that is obtained by allowing carbons or the like to be contained in a wax which has a relatively narrow distribution of melting points, showing some hardness when it is cured and reduced viscosity when it is melted. The filler 16 is scattered by radiating a laser 18 into the cells. In this case,k if the laser is modulated or the radiating time of the laser is changed for each cell, the capacity of a recess in the cell where the filler is dispersed or sublimated can be adjusted. Therefore, the recess 19 having the volume corresponding to the gradation can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intaglio plate cylinder device commonly used in gravure printing.

[Summary of the invention]

The present invention relates to an intaglio plate cylinder device commonly used in gravure printing, in which cells are formed in a net 1'' shape on the plate surface so that the entire surface is black during printing, and the cells are filled with a heat-meltable filler. This filler is then blown away with a laser in accordance with the density of the image, thereby obtaining an intaglio plate cylinder that can be used any number of times and that can be directly plate-made using electrical signals.

[Conventional technology]

Conventionally, many printing methods have been proposed for printing, and letterpress, planographic, intaglio, stencil, etc. have been used as plates. Intaglio printing is used to print images such as photographs at RTLI speed, especially on paper that will be printed in a large number of copies. The most practical method of making a gravure plate from the intaglio plate is illustrated in Figure 5.

The original (photograph) is on the surface of the plate cylinder for gravure printing.
The metal surface of the printing plate is etched on top of this, creating a collection of recessed dots with different depths, and these four parts are filled with ink. This means that one printing will be carried out.

As shown in Figure 5A, the manufacturing process for gravure plate cylinders is as follows: special thick paper fi+ is covered with a gelatin film and sensitized with chromate to form a photosensitive image (2).
(on tissue) (Place a mesh screen (4) on 31 and irradiate light to print the lines, as shown in the image below.) A square-shaped so-called solid black pattern is formed.Next, as shown in Figure 5B, a negative image is created based on the photograph or picture, a transparent positive image is created based on this negative image, and the mesh L] is printed. This transparent positive painting (
5) is placed and irradiated with light to print.

Next, the surface of the cylindrical plate cylinder (6) as shown in Figures 6 and 7 is coated with a thick copper film (7).
Wet the photoresist film (2) with a car punch (3).
ζ and wrap it tightly. Next, as shown in Figure 5C, soak the carbon tissue in hot water at around 40°C.11. lt
When + is peeled off, the gelatin that has not been exposed to light will also melt, leaving behind gelatin that corresponds to the degree of exposure between the exposed mesh and the inner surface. Next, place a blank cloth of Ashard on the surface other than the screen to prevent etching, and then etch it with 29r chloride and +91 chloride to create depressions with different depths depending on the degree of exposure, as shown in Figure 5. The plate cylinder (6) thus completed is soaked in -ffl+ in a solvent type ink reservoir (10) as shown in FIG. 7, and excess ink is scraped off with a doctor (11). The doctor (11) is pressed with a sharp knife to the plate surface of the plate cylinder, so it scrapes off ink other than the ink clogged in the numerous holes (hereinafter referred to as cells) formed on the plate surface, pressure IIL4 (12). The paper (13) to be printed is pressed against the plate surface of the plate cylinder (6), and the ink (Ill) is adsorbed onto the paper (13) as shown in FIG. The fM degree of this adsorbed ink varies depending on the depth of the cells etched on the plate surface of the plate cylinder. In other words, there are many 11 numbers in a deep cell, so i! ＜、A small star in 4 is in a shallow cell.
- It's boring, so it ends up being thin.

[Problem to be solved by the invention] According to the gravure plate cylinder shown in the conventional configuration on paper, the plate cylinder is manufactured for each printing, so it is good when printing a large amount of printed matter, but the number of printed sheets is limited. Printing costs per sheet for dozens to dozens of sheets!・There was a problem that not only the amount increased significantly, but also that the plate-making process was complicated. Recently, a method of making a plate using a laser has been proposed, but this method involves directly irradiating a cylindrical plate cylinder made of ceramic or thermosetting 1M resin with a strong laser power such as gas. Since the intaglio plate is made, there is a problem in that it requires large-scale equipment and is expensive.

The present invention was created in view of the problems associated with paper, and its purpose is to obtain a high-quality, low-cost printing cylinder that is suitable for printing a large number of medium-sized sheets. There is thing C.

(Means for resolving the problem) The intaglio plate cylinder device of the present invention has a mesh pattern so that the plate surface is completely black when printing in Z direction, as shown in FIGS. 1 to 3. A cell (15) is formed in the cell (15), and a heat-melting filler (16) is filled in the cell (15).
) is scattered by a laser (18) in accordance with the density of the image.

(Function) In the intaglio plate cylinder device of the present invention, a heat-meltable filler is placed in the cells formed in the plate U, and this filler is heated using a laser to change the volume in accordance with the density of the image. With this arrangement, it is possible to obtain an intaglio plate cylinder that can be used any number of times.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

Figure 1 is an intaglio plate cylinder! ll! The manufacturing process for obtaining the 2-position structure is a process that is complicated, and Figure 1A is the same as the process shown in Figure 5A, in which a screen (4) is placed on a carbon tissue (3) and light is irradiated to form a mesh. The photoresist film (2) is exposed to light, and the surface of the cylindrical material that will become the plate cylinder is thickly plated with lit IQ +7.
) Wet the top with alcohol and apply 7 coats of car punch (3
) was wrapped around the printing plate, and as shown in Figure 5C, the paper (1) of the carbon tissue (3) was peeled off using hot water at around 40°C, and the unexposed part of the gelatin was removed. By rinsing, the plate surface of the plate cylinder (6) has cells (15
) is etched. So-called, the entire plate surface becomes solid black during printing. Next, a heat-melting filler (I6) is applied to the entire plate surface as shown in FIG. 1C.

This filler (16) has a relatively narrow melting point distribution range, is hard when hardened, and has low viscosity when melted (wax adjusted to φ containing carbon etc. is used.Other fillers The materials used are Para-7, Inwax, and Mark C Crocrystalline wax.

Synthetic or natural waxes or low molecular weight polyolefin agents such as , 1 mm ethylene wax, Actanafuku polypropylene, Carba 1: J wax, adipic acid, azelain, sebacic acid, decanedicarboxylic acid, eicosaninic acid, dimer acid Cycalphone CIQ having 4 to 6 carbon atoms such as enalene glycol, 4-butanediol, diethylene glycol.

Polyesters obtained by polycondensing diols or polyols having 2 to 500 carbon atoms such as -1 lienalene glycol, polypropylene glycol, ramethylene glycol, higher fatty acids such as stearic acid and their esters, Examples include, but are not limited to, conductors made of +ili-class fatty acids such as stearylamide, #J4 conductors of higher fatty acids such as stearyl alcohol, and conductors made of thermoplastic synthetic resins. It may also be a copolymer with enamel and vinyl acetate resin.
! The surface of such a filler (16) is coated with a doctor (11), in which about 20% of black dye can be mixed in to improve the color of the filler (16).
) to obtain a plain plate cylinder (6) with a smooth surface and a filler (16) filled in the cells of the plate surface, as shown in the first diagram. Next, as shown in FIG. 1E, the cell filled with the filler (16) is irradiated with a laser (18) to scatter the filler (16). In this case, by modulating the laser or changing the laser irradiation time for one cell, the amount of depression that the filler in the cell will scatter or sublimate.

The size is adjusted to form a depression (19) with a volume corresponding to the gradation as shown in FIG. 1F. 1st Igl F(1) A
An enlarged view of R(S) is shown in Fig. 2.In other words, the amount of filler (16) scattered by the laser (18) can be varied depending on the density of the video input signal, or the amount of filler (16) can be changed so that the area 3 can be taken up. There is.

Figure 3 shows a small energy emission type semiconductor laser (about 1W) (
20) is used to form a depression (19) in a filler (16) filled in a cell (15) of a plate cylinder (6).

In Figure 3, a video human input signal (21) captured by an image scanner etc. is supplied to a semiconductor laser (20), which is turned on and off by a video input signal with a PCM drive current.
li warm change related. For this reason, the laser beam emitted from the semiconductor laser (20) blinks in synchronization with the image (revision).The laser beam emitted from the semiconductor laser (20) is made into parallel light by the collimating optical system (22), and the focusing lens (23
) is focused on the filling material (I7) in the cell (16).

Semiconductor laser (20), collimating optical system (22)
.

A laser block (24), which is fitted with a focusing lens (23), is initially focused on one cell on the leftmost side of the plate cylinder (6). The plate cylinder (6) is rotated in the direction of arrow B by a plate cylinder 1 diversion motor (36) shown in FIG. 1
- Cell groups (16) corresponding to ranks are scattered by a laser beam to create a predetermined depression. Next, add 1 seazab (24) to 1
When the 611 element separation cylinder is moved in the axial direction to scatter the filler in the cells, a predetermined distribution is formed in two tracks. If this kind of scanning is carried out sequentially over the entire length of the plate cylinder, the filling material in the cells will be 18 times larger! A seat corresponding to 'a' of the human input signal (21) is formed.

FIG. 4 shows a system diagram for supplying data corresponding to one light of the image signal to the semiconductor laser (20).

The human operation unit (30) in Fig. 4 sends status signals (3[) such as stop and reset to the microcomputer
: written as cpu> (32). cpu(3
2) is a motor driver (33) for forward or reverse rotation of the laser pro-tsuku movement and a motor driver (33) for plate cylinder rotation.
5) and the motor for moving the laser block (34)
and the plate cylinder rotation motor (36) are driven to rotate. The filling material (16) is loaded into the cell (15) by the plate cylinder drive motor (36).
Rotate the clogged plate cylinder (6), use a semiconductor laser to form a depression (19) on the filling material (16) corresponding to the data of the video human input signal (21), and when the plate cylinder (6) rotates once, Move the movement motor (34) by one pixel data and then move the CPU (32) along the circumference of the plate cylinder (6) to create a depression (19) according to the shade of the inner surface. is making one control call.

The data ROM (3B) is a digital iI! that has captured, for example, one frame of the video signal using an image scanner, etc. l
Eleven elephant data D is stored. address A is cpu
It is supplied from the address counter (37) to the data ROM (3B) via (32). According to this address, the image data D is supplied to the gray scale ROM (41), and the gray scale data L according to the shading of the image data D is supplied.
)0 according to the gray scale ROM (41). The address AU of the grayscale ROM (41) is configured to supply the pulses generated by the pulse generator (39) to the counter (40), and the pulse generator (
A modulated pulse is supplied from 39) to an AND gate circuit (42). Grayscale data is supplied from the grayscale ROM (41) to the AND gate circuit (42), and is sent to the semiconductor radar (2) via the laser driver (43).
0).

In this example, the cells (15) are filled with heat-melting wax, etc., so after ink is added and gravure printing is completed, this cell (15) is filled with filler again, and the plate is returned to its original state. Since it can be returned to the same state as before, gravure plates (print cylinders) can be produced many times at low cost and in a simple process. In addition, since gravure plates can be made directly using electrical signals, various types of III@! Can supply input. In addition, since the four parts of the solid ring, that is, the cells, are pre-provided on the plate cylinder, the wax, etc. does not peel off during gravure printing, compared to the case where wax, etc. is applied directly to the cylindrical surface and images are formed using electrical signals. It is possible to increase the plate strength.

In the above-mentioned embodiment, cells were formed by etching on a cylindrical plate cylinder and filled with a filler material. The present invention may be wrapped around a plate cylinder, filled with a filler material into these meshes or through holes, and scattered with a laser according to the amount of heat generated, thereby creating a gravure plate. The invention is not limited to the examples and may be modified without departing from the spirit of the invention.

(Effects of the Invention) According to the intaglio plate cylinder device of the present invention, a plate cylinder (gravure plate) that can perform gravure printing with different Ml types many times in a simple process can be obtained, so a plate cylinder with low cost can be obtained. This makes it possible to reduce the cost of printed matter.

[Brief explanation of the drawing]

Fig. 1 is a manufacturing process diagram showing one embodiment of the plate cylinder device of the present invention, Fig. 2 is a partially enlarged side sectional view of Fig. 1, and Fig. 3 is a laser scanning system of the plate cylinder device of the present invention. Fig. 4 is a system diagram of the laser scanning system of the plate cylinder device of the present invention, Fig. 5 is a manufacturing process diagram of the conventional gravure plate making, Fig. 6 is an enlarged view of the main parts of the gravure printing plate cylinder, FIG. 7 is a conceptual diagram showing gravure printing. (1) is paper, (2) is photosensitive film, (4) is screen, (
7) is preparation, (11) is doctor, (16) is filler, (
25) is a semiconductor laser l.

Claims (1)

[Claims] Cells are formed in a mesh pattern on the printing plate so that it is completely black when printed.
An intaglio plate cylinder device characterized in that the cells are filled with a heat-melting filler, and the filler is scattered by a laser in accordance with the density of an image.