JPH0326517Y2 - - Google Patents

Description

[Detailed explanation of the idea] In photoengraving work, we use a given manuscript as a standard, and if necessary, we also take into account the requester's wishes to create printed matter with the desired tone and density. Various types of retouching are performed, and the present invention relates to a new proposal for a tool to be used in this retouching work.

Colored printed matter is created by first creating a total of four printing plates: yellow, red, indigo, and black, and then overprinting each plate using ink of the corresponding color. is a well-known fact.

By the way, when creating each of the above plates, if the arrangement direction of the individual halftone dots in each plate (hereinafter referred to as the "mesh angle") is made the same, moiré (interference stripes) will occur, which will affect the final printed result. It becomes a disused item.

Therefore, when creating each plate, the mesh angle for each plate is varied by a required angle to prevent moire from occurring.

Now, when creating colored printed matter, in addition to photographic images and character images, it is often the case that partial colors are expressed.For example, instead of forming character images directly on the fabric of printing paper, there is a difference in density between each part. In such cases, a character image is formed on an arbitrary colored background without any color, and in such a case, the colored background is form.

However, in order to form a colored background, the above-mentioned 4
Since it is natural to form two printing plates, in this case, in order to prevent the above-mentioned moire from occurring,
When creating each plate, the mesh angle of the flat mesh for each plate must be changed by the required angle.

By the way, when looking at the formation of colored backgrounds, it is often found that they are scattered here and there on a single printed matter. In many cases, the areas where the net is attached are located here and there on the base film.

The present invention proposes a concrete measure that can accurately meet the above requirements, and its gist is: (a) A large number of scratches are formed on the entire surface of a mount film having a desired area, and (b) One of the marks in the above screen is a so-called flat screen in which halftone dots with a certain area ratio are arranged in a line, and unique mesh angles are set for forming each printing plate for yellow, red, indigo, and black. (c) The large number of screens in (a) above are composed of four types of flat nets arranged next to each other and arranged consecutively. Therefore, any one of the four types of flat screens is placed at any position on the mount film, and (d) each screen has its own unique mesh for forming each printing plate. A mark must be attached to indicate that it has an angle.

A master sheet for flat mesh pasting that satisfies (a) to (d) above.

Regarding the proposal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings showing one embodiment.

Fig. 1 shows a top view of the flat mesh pasting master sheet according to the present invention, and this master sheet 1 is, for example, A3 size standard, and has many sheets on its entire surface. Mark 2 is formed.

Marks Y, M, C, and B are placed on each of the 2nd exposures.
These Y, M, C, and B are marked as one unit, and these are marked consecutively, and the marks Y, M, C, and B are marked at any position on this master sheet 1. Screen 2 is placed.

The above marks Y, M, C, and B indicate the mesh angle, and Y is a flat mesh formed at a mesh angle of, for example, 30 degrees for yellow printing, and the same applies below.
M indicates a flat net with a mesh angle of 75 degrees for red plates, C indicates a 45 degree mesh angle for indigo plates, and B indicates a 15 degree mesh angle for black plates.

Note that 3 is a pin hole as a position regulating means using a pin system.

The present invention has the above configuration, and the following effects can be obtained.

The positional relationship of related parts when pasting flat mesh is the second
As shown in the figure.

That is, 4 is a transparent glass plate constituting a light table, and a mount negative 5 is placed on it.

A main master sheet 1 is placed on a mount negative 5, and a base film 6 for pasting a screen screen is further placed on top of the main master sheet 1.

Then, the colored background forming portion (white blank) on the mount negative 5 is seen through.

Therefore, a flat mesh is pasted on the colored background forming part according to the mesh angle set for each plate.
This master sheet 1 consists of a mount negative 5, a base
The master sheet 1 has an area large enough to cover the entire surface of the film 6, and the mesh angles necessary to create each of the yellow, red, indigo, and ink plates are included in every part of the master sheet 1. Tanning by flat mesh (1st
Because the marks (see figure) are arranged, no matter where the color background forming part is on the mount negative 5, the marks (Y, M, C,
Based on B), place the flat mesh to be pasted on the corresponding screen according to the plate to be created, and match the mesh angle of the flat mesh for pasting to the mesh angle of this master sheet 1. Since it can be pasted by hand, it is extremely easy to perform this work, which is sure to dramatically improve work efficiency.

Note that there are no particular limitations on the shape or number of marks or the arrangement of Y, M, C, B, etc.;
It is only necessary that a screen having the required mesh angle for each printing plate be placed at any position.

[Brief explanation of the drawing]

FIG. 1 is a top view of the master sheet according to the present invention, and FIG. 2 is a longitudinal cross-sectional view showing the positional relationship of related members when pasting a flat mesh. The code is; 1... Master sheet, 2... Film, 4
. . . transparent glass, 5. mount negative, 6. base film.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A large number of scratches are formed on the entire surface of a mount film having a desired area, and (b) One scratch in the scratches is formed by halftone dots with a constant area ratio. It is a so-called flat screen that is arranged in an aligned manner, and is one of the four types of flat screens that have unique mesh angles for forming printing plates of yellow, red, indigo, and black. (c) The multiple screens in (a) above are constructed by arranging four types of flat screens next to each other and arranging them consecutively. (d) each screen is marked with a mark indicating that it has a unique mesh angle for forming each printing plate; . A master sheet for flat mesh pasting that satisfies (a) to (d) above.