JPS6142628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a proof plate in gravure printing.

In the field of gravure printing for building materials, it is always necessary to present original designs to customers. However, it is not appropriate to perform proofreading using a full version for this presentation in terms of cost and delivery time, and therefore, conventionally, presentations have been made by printing using a plate-shaped proofing version. In order to obtain the same reproducibility and post-processing characteristics as the main plate, this plate-shaped proof plate is conventionally made using the same etching process as the main plate; There is a problem with this point.

On the other hand, electronic engraving platemaking technology has recently developed, but in electronic engraving platemaking, the object to be engraved must have a cylindrical shape similar to a gravure cylinder, so this platemaking method directly engraves on a plate-shaped proof plate. cannot be applied.

In view of the above points, the present invention provides a gravure proofing plate production method that uses electronic engraving platemaking technology that is excellent in terms of reproducibility with the main plate, and also enables direct engraving on a plate-like proofing plate. This is what we are trying to provide.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an original support cylinder that supports an original (not shown) on its surface.
The engraving needle of the engraving device E2 is operated by the output signal from the photoelectric scanning device E1. The engraving device E2 engraves the surface of the calibration plate engraving cylinder 2.

The proof plate engraving cylinder 2 is constructed to have a cross section shown in FIG. That is, a base copper plating layer 4 is formed on the outer periphery of the iron core 3,
Around it is a Ballard release layer 5 made of silver plating.
is formed, and a Ballard copper plating layer 6 is further applied on the outermost periphery. In the cross-sectional configuration described above, this engraving cylinder 2 is no different from a gravure plate cylinder made by the known Ballard process, but in the case of a gravure plate cylinder made by the Ballard process, the top copper layer is stripped off and discarded after printing is completed. On the other hand, in the present invention, the method of use is different in that the stripped copper layer is used for proof printing as will be described in detail below.

By being engraved by the engraving device E2 in accordance with the original plate, engraving portions are formed on the Ballard copper plating layer 6 of the engraving cylinder 2 by dividing them into the size of the proof plate as shown at 7.

After the engraving 7 is formed as described above, the Ballard copper plating layer 6 is peeled off along the score line 8 as shown in FIG. 3, as in the case of the known Ballard gravure plate. . At this time, the release layer 5
serves to facilitate the peeling off of the Ballard copper plating layer 6 and remains attached to the surface of the engraving cylinder 2.

The Ballard copper plating layer 6, which has been stripped to a size defined by the score lines 8, is a rectangular foil having engravings 7, as shown in FIG. 4, thereby forming a plate-like proof plate. The peeled off Ballard copper plating layer 6 is pasted onto a thin metal plate 10 via double-sided adhesive paper 9. As the thin metal plate 10, a thin steel plate is usually used. The Ballard copper plating layer 6, the double-sided adhesive paper 9, and the thin metal plate 10 are bonded together by passing them between a pair of nip rolls 11 and 12, as shown in FIG.
Below, FIGS. 6 to 9 will be explained.

As is well known, double-sided adhesive paper has adhesive applied to both sides, and the adhesive layers on both sides are usually covered with a release sheet. Prior to the adhesion work, the release sheet on the lower surface of the double-sided adhesive paper 9 is peeled off, and the double-sided adhesive paper 9 is adhered to the upper surface of the thin metal plate 10 as shown in FIG. 6 through the exposed adhesive layer on the lower surface. Ru. In this state, the release sheet 9a on the top side
remains on the double-sided adhesive paper 9.

Next, the Ballard copper plating layer 6 is placed on the surface of the release sheet 9a of the double-sided adhesive paper 9 on the thin metal plate 10, and the Ballard copper plating layer 6 is placed on the thin metal plate 10.
The patterns are matched and the Ballard copper plating layer 6 is accurately positioned with respect to the thin metal plate 10. After the positioning is completed, they are partially sandwiched between the nip rolls 11 and 12 as shown in FIG.

After the sandwiching is completed, as shown in FIG. 8, the Ballard copper plating layer 6 is lifted to expose the release sheet 9a, and most of it is cut off with a knife. Next, by rotating the nip rolls 11 and 12 in the direction of the arrow, all the sheets are passed between the two nip rolls, and the parts where the release sheet 9a is not present are passed through the adhesive layer on the upper surface of the double-sided adhesive paper 9. , a Ballard copper plating layer 6 is adhered to the upper surface of the adhesive paper 9 as shown in FIG. Next, as similarly shown in FIG.
When 1 and 12 are rotated in the opposite direction, all the sheets are fed to the right in the figure, and the Ballard copper plating layer 6 is adhered to the thin metal plate 10 via the adhesive paper 9 on all sides.

The bonded sheet 13 of the Ballard copper plating layer 6 and the thin metal plate 10 obtained as described above is attached to the plate attachment cylinder 14 of the proofing machine, as shown in FIG. For this installation, attaching cylinder 1
It is possible to take measures such as providing a groove on the circumferential surface of the plate 4, bending and fitting both edges of the joining sheet, that is, the plate 13, into the groove and pressing it with the pressing member 15. The proof cylinder thus obtained is combined with the impression cylinder 16, placed on the ink pan 17, and proof printed in a well-known manner. Note that 18 indicates a doctor blade.

What should be noted here is that the plate attachment cylinder 1
4 and the radius of the calibration plate engraving cylinder 2 are made substantially the same. As already mentioned, ink cells for gravure printing are formed on the base copper plating layer 6 by engraving by the engraving device E2, but when forming this ink cell, the Ballard copper plating layer 6 is applied to the circumferential surface of the cylinder 2. Because it is attached, it has an arc shape. Then, this arc-shaped Ballard copper plating layer 6 is temporarily brought into a flat state when attached to the thin metal plate 10. Further, deformation of the Ballard copper plating layer 6 also occurs when it is peeled off from the cylinder 2 prior to this adhesion.
As a result, the ink cells of the engraving portion 7 may be crushed or deformed. In order to return such changes in the ink cells to the state at the time of engraving, it is extremely useful to prepare a plate adhering cylinder 14 having the same radius as that at the time of engraving and to adhere the plate 13 to this.

As mentioned above, the peeling of the Ballard copper plating layer 6 performed in the present invention is not performed for the purpose of discarding the Ballard copper layer after printing, unlike the peeling of the Ballard copper layer of the Ballard method gravure plate cylinder. This is done in order to use the peeled material for printing.
Therefore, peeling must be performed by providing a complete peeling layer 5. To this end, careful attention must be paid to improving the purity of silver bromide during plating and controlling the temperature of the cylinder during silver plating to form a release layer. On the other hand, it is also necessary to give sufficient consideration to the hardness, thickness, etc. of the Ballard copper plating layer 6.

As described above, according to the present invention, a calibration plate engraving cylinder having a Ballard copper plating layer is prepared, and after engraving, the Ballard copper plating layer is peeled off, and the peeled Ballard copper plating layer is calibrated. Since the calibration plate can be configured by attaching it to the plate application cylinder of the machine, it is more efficient than the conventional case, and the plate application cylinder and the calibration plate engraving cylinder can be made to have almost the same diameter. By doing so, accurate proof printing is possible without causing any change in the ink cells of the plate. On the other hand, in the present invention, the Ballard copper plating layer after peeling is attached to a thin metal plate and then attached to the plate application cylinder through it, which is compared to the case where the Ballard copper plating layer is directly applied to the plate application cylinder. death,
Fine dust and scratches on the barrel itself will not cause irregularities on the Ballard plate surface, causing doctor streaks to appear on the printed matter or impairing registration accuracy.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the state of engraving in the present invention, Fig. 2 is a cross-sectional view of the calibration plate engraving cylinder, Fig. 3 is a perspective view showing the state of peeling of the Ballard copper plating layer from the cylinder, and Fig. 4. is a perspective view showing the overlapping state of the Ballard copper plating layer, double-sided adhesive paper, and thin metal plate after peeling; Fig. 5 is a diagram showing the process of adhering them; Figs. 6 to 9 are details of the adhesion process. FIG. 10 is a diagram showing the state in which the plate is attached to the plate sticking cylinder. DESCRIPTION OF SYMBOLS 1... Original plate support cylinder, 2... Calibration plate engraving cylinder, 4... Base copper plating layer, 5... Ballard peeling layer, 6... Ballard copper plating layer, 7...
Engraving part, 8... Cut line, 9... Double-sided adhesive paper, 1
0...Thin metal plate, 11,12...Nipprol,
13... Obtained plate plate, 14... Plate plate sticking cylinder, 16... Impression cylinder, 17... Ink pan,
E1...Photoelectric scanning device, E2...Engraving device.

Claims (1)

[Scope of Claims] 1. A calibration plate for engraving which has a radius approximately equal to the radius of curvature of the plate attachment cylinder of a proofing machine, has a Ballard peeling layer on the circumferential surface, and has a Ballard copper plating layer on the surface. A cylinder is prepared, and the engraving is performed on the Ballard copper plating layer of this engraving cylinder in the same way as the main plate.Then, the Ballard copper plating layer is cut to a desired size and peeled off from the Ballard release layer. By pasting the peeled Ballard copper plating layer on a thin metal plate and fixing the thin metal plate to the circumferential surface of the plate application cylinder of the proofing machine, the Ballard copper plating layer is applied onto the circumferential surface. A method for manufacturing a gravure proofing plate, which comprises attaching a gravure proofing plate to obtain a gravure proofing plate. 2. The gravure proofing plate manufacturing method according to claim 1, wherein the Ballard copper plating layer is attached to a thin metal plate via double-sided adhesive paper. 3. The gravure proofing plate manufacturing method according to claim 2, wherein the Ballard copper plating layer, the double-sided adhesive paper, and the thin metal plate are adhered by passing them between nip rolls. 4. The gravure proofing plate manufacturing method according to any one of claims 1, 2, and 3, wherein a thin steel plate is used as the thin metal plate.