JPH0331139B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) Foam printing, raised printing, etc. are often used for printing on building materials. A gravure printing plate is used.

If you want to make a proof of this gravure printing,
Proofing with a flat plate (circular pressure type) proofing machine is advantageous in many respects, but in the case of plates with a high plate depth as mentioned above, the cells of the plate are not completely filled with ink, so I couldn't make a proof.

The present invention uses two doctor blades, and by supplying ink to both of the doctor blades, ink is sufficiently supplied into the cells of the plate depth, making it possible to perform flat plate proof printing of the plate depth. That is.

The present invention was developed in order to enable lithographic proof printing with a plate depth as described above, but it can also be applied to improve gravure printing with arbitrary plate depths with poor inking properties.

(Prior art) Flat plate proofing machines are often used for proofing of gravure printing, but in the case of proofing of printing plates with depth (120 μm or more) used for foam printing, raised printing, etc. It was extremely bad, and the flat plate proofing machine was virtually unable to produce proofs, and even if proofs were produced, the quality was poor.

For this reason, proof printing for plate depth was done using a rotary printing method, but the rotary printing method is laborious and requires a large amount of space and space to store the plates. There was a strong desire to improve the proofs.

(Problems to be solved by the invention) After elucidating the cause of this poor ink adhesion, the second
As shown in Figure A, in the case of deep printing, the cells 3 of plate 2 are not sufficiently filled with ink 1, and therefore, when printed, as shown in Figure 2B, complete dots are not formed and rings are formed. It has been found that this method reproduces dots to which ink 1 has been transferred.

In view of these circumstances, in the present invention, two doctor blades are used and ink is supplied to both of the doctor blades so that the cell 3 is sufficiently filled with ink 1, as shown in FIG. 3A. and when printed by this,
As shown in FIG. 3B, the ink 1 is transferred to the printing paper as complete dots, thereby making it possible to perform high-quality gravure printing using a deep plate printing machine.

(Specific means for solving the problems) The present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, a printing plate 2 of a plate to be proof printed is fixed on a printing plate stand 4 of a flat plate proofing machine. This flat plate proofing machine is based on a patent application filed in 1983 by the same applicant.
No. 43200 "Flat multicolor concave plate printing machine", the detailed explanation is omitted.

Plate 2 is obtained by laminating the Ballard layer on the surface of a cylinder plate made according to a general gravure cylinder plate making method to a flat base material, and countless ink cells 3 are formed on the surface. .

A moving table 5 for moving the doctor blade is provided on the upper surface of the plate table 4, and is horizontally reciprocated in the direction of an arrow 6.

The doctor blade 7 is attached to the movable table 5 using a normal doctor blade. This main doctor blade 7 is configured to be moved up and down by an oil cylinder 8. When the ink 1 is supplied to the cell 3, that is, when moving from the right to the left in the figure, the main doctor blade 7 is lowered by the cylinder 8 and applies an appropriate linear pressure (200 kg/cm) to the plate 2 surface. When sliding into contact and returning,
That is, when moving from right to left, it is lifted up by cylinder 8 and returned.

Ink 1 is applied by hand along the left edge of plate 2 to a suitable width. As mentioned above, while the main doctor blade 7 moves from left to right while pressing against the plate 2 surface, the ink 1 is transferred to the cell 3.
supplied within.

The printing paper is wrapped around the circumferential surface of the drum 9, and while the movable table 5 moves from left to right, the printing paper is
Since it is pressed against the second side of the plate to which ink 1 has been supplied, ink 1 is transferred to the printing paper and a proof is printed.

The above is an outline of a calibration machine similar to a general flat plate calibration machine, but in the present invention, the main doctor blade 7
Another auxiliary doctor blade 10 is provided in the sliding direction of movement. This doctor blade 1
0 is not used for normal proof printing, so it is attached to the movable table 5 so that it can be easily removed.

When a plate 2 with a high degree of depth is attached to a plate stand 4 and proof printing is performed on the deep plate, ink 1 is applied along the left side of the plate 2 in a slightly wider width.

Then, as shown in FIG. 1, the doctor blades 7 and 10 descend to the surface of the printing plate 2 coated with the ink 1 and are brought into pressure contact therewith. That is, the blade 7 is the plate 2
blade 10 descends near the left end of blade 7.
Since it descends slightly to the right and comes into pressure contact with the plate 2, by applying ink 1 over a wide area, the doctor blades 7 and 10 are moved to the right in sliding contact with each other, so that the ink 1 is applied to the plate 2 by the two doctor blades. is supplied into the ink cell 3 of. While the movable table 5 moves from left to right in this manner, the tips of the doctor blades 7 and 10 come into sliding contact with the two surfaces of the plate at a certain angle, and the cells 3 are filled with ink 1 to perform proof printing. When the movable table 5 returns to the left again, the doctor blades 7 and 10 do not rise and come into sliding contact with the printing plate.

By supplying ink 1 to the two doctor blades 7 and 10 in this way and supplying ink 1 into the cell 3, as shown in FIG.
is sufficiently filled in the cell 3, and a good deep proof print is obtained.

Here, when the movable stage 5 moves the doctor blade 10 from left to right, a mechanism operates to lower the doctor blade 10 to a position slightly to the right of the left end of the plate 2 and press it against it, and to rise while moving from right to left. I will explain about it.

As shown in FIG. 4, trapezoidal cam plates 11 are provided on both sides of the printing plate 4. As shown in FIG. The shape of the cam plate 11 is such that the upper surface is horizontal and the left and right ends are inclined downward. The blade 10 is attached to the tip of the support 12. The support body 12 is rotatably supported on the movable table 5 with a shaft 13 as a fulcrum. On the opposite side of the support 12 from where the blade 10 is attached,
A roller 14 that comes into contact with the cam plate 11 is provided. Further, the support 12 has a doctor blade 10 at its tip.
The side is pulled upwards by a weak spring 15. When the blade 10 is located on the left side of the printing table 4 (the same applies when it is located on the right side), as shown in FIG. 1
The tip of the 0 is located at a higher position away from the second surface of the plate.

The moving table 5 moves to the right, and the blade 10 moves to the plate 2.
When positioned slightly to the right of the left end, the rollers 14 come into contact with the cam plate 11, the support 12 becomes horizontal, the blade 10 comes into pressure contact with the printing plate, and moves to the right end. (FIG. 4B) At this time, the blade 10 functions to sufficiently fill the cells 3 with the ink 1.

Moving further to the right, the roller 14 moves away from the cam 11 and the support 12 returns to a substantially vertical position. Next, when the moving table 5 moves from right to left and returns, the roller 14
hits the cam plate 11, and as shown in FIG. 4C, the support body 12 is turned in the opposite direction, so that the blade 10 is flipped up and returns to its original position without slidingly contacting the surface of the plate 2.

With such a configuration of the support body 12, the rollers 14, the cam plate 11, etc., when the doctor blade 10 moves from left to right and supplies the ink 1 into the cells 3, it moves slightly to the left of the left end cell 3 of the plate 2. When the sliding movement starts at a distance of , and returns from right to left, it is jumped up and does not come into contact with the plate 2.

(Effects) Since the present invention has the above configuration, it has excellent practical effects as shown below.

That is, conventionally, when proofing using a flat plate proofing machine with a depth of about 120 μm or more, the cells were not sufficiently filled with ink, resulting in poor ink receptivity and making it impossible to obtain proof prints of good quality. However, according to the present invention, the cells are sufficiently filled with ink and can be properly supplied, making it possible to perform high-quality deep plate proof printing.

Further, the present invention is not limited to simply flat plate proof printing of deep plates, but can be expected to improve the ink receptivity of deep plates in gravure printing.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Figure 1 is a partial schematic side view of a proofing machine in the printing method of the present invention, and Figure 2A shows ink applied to the cells of a deep plate using one doctor blade. An explanatory diagram showing the state of ink in the cell when the cell is filled, FIG. 2B is an explanatory diagram showing the inking state when printing is performed using it, and FIG. Fig. 3B is an explanatory diagram showing the ink state in the cell when it is filled with ink, Fig. 3B is an explanatory diagram showing the inking state when printing is performed using it, and Fig. 4 is an explanatory diagram showing the operation of the auxiliary doctor blade. It is. 1... Ink, 2... Plate, 3... Cel, 4...
Plate stand, 5...Moving table, 7...Main doctor blade, 8...Oil cylinder, 9...Drum, 1
0...Auxiliary doctor blade, 11...Cam, 1
2... Support body, 13... Shaft, 14... Roller, 15
……spring.

Claims (1)

[Claims] 1. In concave plate printing using a concave plate with a high plate depth, an auxiliary doctor blade is provided at a distance in the sliding direction of the main doctor blade to supply ink to the edge of the plate. The main doctor blade and the auxiliary doctor blade are brought into pressure contact with the plate surface so that the ink is present on the side in the sliding contact movement direction of the main doctor blade and the auxiliary doctor blade, and the plate surface is brought into sliding contact to supply ink into the concave plate cells. Gravure printing method. 2. The gravure printing method according to claim 1, wherein the concave printing is a flat proofing mark. 3. The auxiliary doctor blade is attached to a support that is pivoted at a fulcrum, and when the cell is filled with ink by the action of the support, cam plate, etc., the doctor blade is moved against the plate from a position slightly away from the edge of the plate. The gravure printing method according to claim 1, characterized in that sliding contact is started.