JPH026450Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a register mark protection seal that protects registration marks printed on printing plates from stains caused by ink transfer.

In printing using a multi-color printing press, it is necessary to accurately match the vertical and horizontal registers of each color by accurately making the printing plates of each color and mounting them on the plate cylinder. Therefore, conventionally,
The amount of misregistration is determined by printing a mark called a dragonfly on printed matter of each color and looking at the misalignment.
Corrections were made by moving the plate cylinders of each color in the circumferential and axial directions. However, this method is extremely inefficient and uneconomical, as it takes a long time to make test prints while making adjustments, and a lot of wasted paper is produced.

Therefore, the development of an automatic registration device that automatically adjusts the color registration of this multicolor printing press is underway. This device prints register marks on the margins of the printing plate before and after the image printing for plate making, and then attaches the printing plate to each color's plate cylinder, and a light emitting/receiving sensor is installed facing each plate cylinder. The register mark is detected by a detector having a register mark, and the plate cylinder position adjustment motor is controlled by the signal generated by the register mark.

However, in such an automatic registration device, there is a risk that ink stains on the blanket cylinder may be transferred to the register marks when the printing plate is mounted on the plate cylinder after the plate cylinder and blanket cylinder have been inserted. If the register mark is detected by a detector in this state, a detection error will occur due to dirt, and accurate registration will not be possible. In addition, register marks on printing plates tend to fade in color when exposed to light, and when the detector detects the faded marks, the voltage level decreases, which also causes detection errors and impairs registration accuracy. There is a problem with lowering it.

The present invention was developed in view of the above points, and is formed by printing register mark shielding on the front side and applying adhesive to the back side.
By pasting it on the register mark of the printing plate,
To provide a register mark protection seal for a printing plate which prevents register marks from becoming dirty and enables accurate registration. Embodiments of the present invention will be described in detail below with reference to the drawings.

Figures 1 to 5 show examples of the register mark protection seal for printing plates according to the present invention. A plan view and a side view of the front surface, Fig. 3 is a plan view of the back side, Fig. 4 is a plan view of the protective seal in the form of a sheet before being separated, and Fig. 5 is a plan view of the protective seal in the form of a paper wrapper before being separated. It is a diagram. In these figures, a printing plate 1 mounted on a printing cylinder of a printing press
is formed into a rectangular shape by a thin aluminum plate, on which the pattern 2 is printed, and in the margin 3 outside the pattern 2, a triangle is used for automatic registration during printing. register mark 4
is set by baking. 5 is a protective sticker that is pasted on top of the register mark 4, and each piece is made of thin paper and is approximately square in shape. As shown in FIG. 4, it is a sheet 6 in which a plurality of sheets are arranged vertically and horizontally, or a wrapping paper 7 in which a plurality of sheets are arranged vertically and horizontally. Perforations 8 are made at the boundaries of each seal 5 before separation by a plane press in the case of the sheet 6 and by a horizontal perforation blade roller in the case of the wrapping paper 7. A band-shaped mask 9 is printed in the center of the surface of the protective seal 5, and has a width sufficient to cover the register mark 4 when attached to the printing plate 1. This mask 9 is printed using a common printing method such as silk screen using colors such as yellow or yellow-containing green and red, which have low photosensitivity. Further, the surface of the protective seal 5 is printed with necessary printing such as a trademark 10 for advertising.
Furthermore, on the back side of the protective seal 5, there is a mask 9 on the front side.
2 located outside the mask 9 so as not to correspond to
The back glue 11 of the strip is provided leaving a non-adhesive part on the outside, and this back glue 11 can be produced by a small-scale production method such as applying a paper pattern and applying adhesive by brushing or spraying, or by using a glue coater machine. It is formed by a mass production method in which it is passed through and applied with a pattern roller with glue. In the case of the sheet 6 shown in FIG. 4, a silicone-coated paper is attached that is peeled off during use, and in the case of the wrapping paper 7 shown in FIG. It is rolled up.

The protective seal 5 constructed as described above is cut off from the perforation 8 of the sheet 6 or paper wrapper 7, the silicone coated paper or coating is peeled off, and the protective seal 5 is affixed onto the register mark 4 of the printing plate 1. Then, when the printing plate 1 is attached to the plate cylinder of each color and the protective seal 5 is peeled off from the non-adhesive side and printing work is started, the register mark is detected by the detector and automatic registration between each color is performed. will be carried out. In this case, after the sticker 5 is pasted until the start of printing, the register mark 4 is covered by a mask 9 with low sensitivity.
Since the register mark 4 is shielded, the register mark 4 will not fade, and even if the printing plate 1 comes into contact with the blanket cylinder, the ink stains on the blanket cylinder will not transfer to the register mark 4 and stain it. There is no. moreover,
Since the back glue 11 is provided avoiding the corresponding part of the mask 9, the register mark 4 will not be stained by the adhesive even if the sticker 5 is pasted.

Figures 6 to 9 show other embodiments of the present invention, Figure 6 is a plan view of the main part of the printing plate showing where the protective seal is attached, and Figure 7 is a plan view of the surface of the protective seal. , Figure 8 is a plan view and side view of the back side,
FIG. 9 is a plan view of the protective seal in the form of a paper wrapper before being separated. In this embodiment, the protective seal 5
A is made horizontally, and the mask 9A is provided offset to one side of the seal 5A, and the back glue 11A on the back surface is provided on both sides of the corresponding part of the mask 9A. When this is attached to a printing plate, the edge of the back glue 11 is positioned on the edge 1a side of the printing plate 1, which is the side to be held in the mouth. By doing so, when the printing plate 1 is mounted on the plate cylinder, pressure is applied from the gripping side edge 1a toward the bottom side edge, so that the protective seal 5A is not peeled off. Further, since there is a non-adhesive portion on the upper side of the protective seal 5A in FIG. 6, the seal 5A can be easily peeled off. The protective seal 5A may be formed into a wrapping paper 7A as shown in FIG. 9, or may be formed into a sheet form as shown in FIG.

In addition, as shown in FIGS. 10a and 10b, the surface of the protective seal 5B is made with three stripes of mask 9B using ink such as yellow, and the space between adjacent masks 9B is marked with a sign band 12 printed with white or other colors. It is also possible to print the trademark 10 and the trademark 10 at the same time. In this case, the back glue on the back side is provided on both sides of the sign band 12 as a mark. By doing this, you can paste the register mark without getting any adhesive on it.

As is clear from the above explanation, according to the present invention, a register mark shielding print is applied on the front side, and a protective seal is provided on the back side with adhesive applied to areas that do not correspond to the printed area. By affixing the register mark for automatic registration of the printing plate only during the time when the printing plate is attached to the plate cylinder, the register mark can be prevented from fading or becoming dirty due to contact with the blanket cylinder. Also, since the register marks are not stained by the adhesive on the back of the seal, the detection accuracy by the automatic registration device does not deteriorate, and high color-to-color printing accuracy can be ensured. Further, this protective seal can be manufactured at a very low cost, and is also useful for advertising purposes if a company name, trademark, etc. are printed on it as shown in this embodiment.

[Brief explanation of drawings]

Figures 1 to 10 show examples of the protective seal for printing plate register marks according to the present invention, Figure 1 is a plan view of the main part of the printing plate to which this is pasted, and Figure 2 is a diagram of the protective seal. A plan view and a side view of the front surface, Fig. 3 is a plan view of the back side, Fig. 4 is a plan view of the protective seal in the form of a sheet before being separated, and Fig. 5 is a plan view of the protective seal in the form of a paper wrapper before being separated. 6 to 9 show other embodiments of the present invention, FIG. 6 is a plan view of the main part of the printing plate with a protective seal attached, and FIG. 7 is a plan view of the surface of the protective seal. , FIG. 8 is a plan view and side view of the back side, FIG. 9 is a plan view of the protective seal in the form of a paper wrapper before being separated, and FIGS. 10 a and b are protective seals as other embodiments of the present invention, respectively. FIG. 3 is a partial plan view of the wrapping paper before it is separated. 1...Printing plate, 4...Register mark, 5,5
A, 5B...protective sticker, 9,9A,9B...mask, 11,11A...back glue.

Claims (1)

[Scope of utility model registration request] It is a protective sticker that is pasted on the register mark of the printing plate, and the front side has a register mark shielding print in a color with low sensitivity in the area corresponding to the register mark, and the back side has a register mark shielding print on the part corresponding to the said register mark, and the back side has a register mark shielding print in a color with low sensitivity. A register mark protection sticker for printing plates that is characterized by having adhesive applied to the non-compatible parts.