JPS585259A - Registering method in printing - Google Patents

Abstract

PURPOSE:To detect visually even slight defects of register by printing register groups consisting of combinations of registering defect warning maks made of geometrically and regularly distributed spots and lines, and color-coded patterns and registers on a printing medium. CONSTITUTION:A register group 1 is composed of a cross-shaped register 2 and registering defect warning marks 3 made up of geometrically regularly distributed lines. The register groups 1 are printed, along with color-coded patterns 5-A, 5-B, 5-C, and 5-D, on a printing medium 4. Thus, when proper printing is not made, the register groups 1 are printed in a lapping manner, Moire signal is generated at the registering detect warning marks 7, and therefore, the presence of registering defects can not be confirmed visually.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for easily determining the quality of registration in printing.

2. Description of the Related Art The development of printing presses in recent years has been remarkable, and it has become possible to obtain beautiful printed matter more quickly and easily. However, even when printing is performed using such an excellent printing machine, the registration of the printed matter may change slightly due to factors such as the paper feeding method, expansion and contraction of the paper, and changes in the humidity in the printing room, resulting in misregistration. The current situation is that many such cases occur.

Conventionally, registration in printing involves printing register marks (registration marks) such as crosses (register marks), rectangles, polygons, etc. together with the pattern, and determining whether the registration is good or bad by observing how these register marks overlap. was.

However, it is difficult to judge minute misregistrations, especially during printing, with the human eye, even if a strobe light emitting device that emits light in synchronization with the conveyance speed of the printed material is used. This could only be determined by observing the register portion of the printed material through a magnifying glass.

The present invention has been made in view of the above circumstances,
The purpose of the present invention is to provide a method for determining the quality of registration in printing, which makes it possible to easily detect even the slightest misregistration by visual inspection.

That is, the present invention provides a misregistration warning mark consisting of a divided color pattern, a registration mark such as a cross, a rectangle, a polygon, and geometrically regularly distributed points and lines at a desired location on a printing medium. While printing with each printing ink with a combination of registers, the presence or absence of moiré in registers overprinted on the same portion of the printing material is visually checked to determine whether the registration is good or bad. It is characterized by

Hereinafter, the present invention will be described in detail with reference to the drawings.

Figures 1 to 3 show the register marks (11) used in the present invention, where (2) is a cross-shaped register mark and (3) is a geometrically regularly distributed line. This is a misregistration warning mark composed of points. Good too.

The register (1) with such a configuration is not formed on each color separation plate together with the color separation pattern (Fig. 4 shows a printing plate having a pattern forming part and a register Registration (6) and color separation pattern (5-A15-B1) printed on a broken egg ml body (4) of plastic film, glass plate, metal plate, etc.
s-C, 5-D) is shown. In FIG. 4, 8 shows the printing state after printing the first color, B shows the printing state after printing the second color, C shows the printing state after printing the sixth color, and 1] shows the printing state after printing the first color.

The register marks (6) formed on each color separation plate are set to be congruent, and if the correct mark @11 is made, the register marks (6) formed on each color separation plate are placed at the same position on the printing medium (4). are printed one after another. Figure 5 is! 611 stacked registers (6)
(The one shown in Figure 1 is used as a rough guide.)

On the other hand, if proper printing becomes impossible due to expansion or contraction of the printing medium during printing or mismatch between the surface speed of the impression cylinder and the surface speed of the printing plate in the printing press, the printing medium (4) The register of Ill is overlapped as shown in Figure 6.
Slurped. In other words, the misregistration warning mark (7) that makes up the misregistration (6) is composed of geometrically regularly distributed points and lines, so if a minute misregistration occurs, the misregistration warning mark (7) (Moire occurs in the force part,
The branch office will be able to visually confirm whether or not there is misalignment.

In particular, as shown in Fig. 1, the moiré in the misregistration warning mark (3) part is the same as when the gap is on the comparison curve and the center is the moire pattern θ. When the registration error increases, the gaps between the moiré patterns become relatively dense and spread out to the periphery, so it is possible to immediately determine the magnitude of the registration error.

If the operator confirms that moire has occurred, he activates the registration correction device of the printing press so that moire disappears. When moire disappears, correct printing without misregistration is being performed. It is.

Since the present invention has the above-described configuration, it is possible to detect slight misregistration by simply visually observing the misregistration overprinted on the printing material, that is, by simply checking the presence or absence of moiré in the misregistration warning mark area. The presence or absence of misregistration is immediately determined,
It is also possible to contribute to the reduction of defective printed matter and the reduction of printing costs associated with the reduction of printing defects.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of the configuration of a target group used in the present invention, FIG. 4 is an explanatory diagram of the present invention, and FIGS. 5 and 6 are
The figures each show an explanatory diagram of a group of registers overprinted on a printing medium. (1), (6)...Target group (2)...Target (
3), (7)...Poor registration warning mark (4)...Printing material patent applicant: Toppan M11 Co., Ltd.

Claims (1)

[Claims] (1) At a desired location on the printing material, combine a color-separated pattern, a registration mark such as a cross, a rectangle, a polygon, and a registration defect warning mark consisting of geometrically regularly distributed points and lines. While printing with each printing ink that is a register group consisting of 1 object, visually check the presence or absence of moiré in the register group overprinted on the same part of the fi 1 object to be printed, and judge whether the registration is good or bad. Characteristic registration determination method in printing.