JPH0368945A - Color ball film for color printing - Google Patents

Abstract

PURPOSE:To allow administration from plate making to printing with one mark by making the total of the opposite dot ratios of the sectorial dot parts divided to an annular shape into 100% and forming patterns for discriminating unequal printing at the center. CONSTITUTION:The color ball film 1 is formed by dividing the dot part to the plural sectorial shapes, combining the divided sectorial dot parts 4A to 4H to1 100% total of the dot ratios of the opposite sets and forming the patterns 5 for identifying the unequal printing at the center. A stripping operation is executed by mounting the color ball film 1 and the exposing state in the dot parts of the color ball 1 is measured with a dot meter at the time of a returning operation. The total of the dot ratios is disposed in 100% at this time and, therefore, the immediate discrimination of the % dot in which part is possible and the workability is greatly improved. Since the adequateness or not is immediately known by observing the patterns 5 for the discrimination at the time of proof printing, the administration from the plate making to the printing is possible with one film.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a colored film for color printing, which is produced at the same time as the film in the plate-making process to control the process when color printing is performed by offset.

(Prior art) Conventionally, when printing a color photo using offset printing, the photo that becomes the base plate is separated into four colors of red, blue, yellow, and black using a scanner during the plate-making process, as shown in Figure 7. , make four negative films.

Separately, characters and figures created by phototypesetting are photographed in different colors to create a negative film.

Next, after the color-separated photographic negative film and the text and figure negative film are laid out by color, they are put through a reversing printer and turned over to create a positive film, which is then used for the plate-making process. end.

Next, the positive films prepared for each color are brought into close contact with a plate material whose surface is coated with a photosensitive material and exposed to light, and the figures and characters are transferred to create a printing plate, completing the printing plate process.

In the subsequent printing process, ink is applied to four lithographic plates made for each color, the four colors are overprinted on paper, and color proofing is performed by checking the state of the printed colors.

In such an offset printing process, a negative or positive film is created by photographing a block or original, and therefore, depending on the exposure time, development time, etc., it may not be possible to reproduce the original color tone of the photograph.

For this purpose, conventionally, a film with marks called a color control gauge (strip) is attached to the edge of a positive film during the printing plate process, and the plate material is exposed to light to form marks at the corners of the plate.

This planar plate was printed in color, and the color tone of the printed mark was determined from the state of the printed mark.

Does the color control gauge that forms this mark have a square dot area with a dot ratio of 100%, 95%, or 5%? 3i is a film formed in a series of several strips, each of which is attached to the edge of a positive film in the printing plate process for each of the four colors, and exposed to the plate material.

However, with conventional methods, even if the color tone does not come out due to an inversion failure when creating a positive film during the plate making process, the color control gauge is attached during the subsequent printing process, making it impossible to determine the cause. There were drawbacks.

The color control gauge that serves as the mark is a long strip with multiple halftone dots arranged in a straight line, such as 100%, 95%, 5%, and mixed color halftone dots, which are combined in four colors. The total number of halftone dots that are arranged for printing is about 40.

For this reason, there was a drawback that it was difficult to see the finished printing state.

In addition, in recent years, photographic printing has come to require highly accurate reproducibility, and the conventional halftone dots of 95% and 5% are not sufficient. For this reason, there is a problem in that if the number of halftone dots is increased at a finer ratio, the area of the color control gauge becomes even larger.

Also, in the plate-making process, it has traditionally been done to add marks called colored beads, but these are attached when turning negative film to make positive film, and simply indicate which color the film is for or whether it is a lithographic plate. It was only for distinguishing colors and had no function to distinguish the printed color tone.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and it is possible to manage the entire process from the plate making process to the printing process with one mark, reproduce and print a photograph with high accuracy, Moreover, since the area of the discrimination mark is small, the present invention provides a colored clay film for color printing that can effectively use the printing surface.

(Means for Solving the Problems) The present invention divides a ring-shaped halftone dot portion into a plurality of fan shapes, and sets a plurality of opposing fan-shaped halftone dots of the divided fan-shaped halftone dot portion. The ring-shaped halftone dots are combined so that the total halftone dot ratio becomes 100%, and a printing unevenness discrimination pattern is formed at the center of the ring-shaped halftone dots.

(Function) Next, to explain the function of the present invention, a photograph that will be a draft manuscript is separated into four colors using a scanner, and a negative film is created for each color.This negative film is then laid out,
A colored soil film is attached to this edge and the collection work is carried out.

In the subsequent reversing process, the laid-out negative film is printed on a reversing printer to create a positive film, the inverted colored balls are observed with a magnifying glass, and the exposure condition of each fan-shaped halftone dot is determined using a dot meter. .

In this case, each fan-shaped halftone dot part has a total of 100% of the opposing part.
Even if the ratio is reversed, some of the arrangement order remains the same, so you can immediately determine which area has what percentage of halftone dots, which improves work efficiency. It can be significantly improved.

If you discover an exposure defect in the process of reversing negatives to positives with this reversing printer, you can adjust the exposure intensity again and reverse the process again, and if you discover a density defect in the automatic processor, you can do the same thing again. Adjust and flip again.

After creating four sheets of positive film for each color in this manner, the positive film is layered on a printing plate coated with a photosensitive material and exposed to light to be transferred onto a planographic plate.

At this time, you can determine whether the exposure is appropriate by comparing the positive film and the plate material.

Also, make a test print on paper with four colored inks using four lithographic plates created for each color, observe the fan-shaped halftone dots of the printed color distortion with a magnifying glass, and compare it with the positive film to see if the proof is correct. It can be determined whether halftone dot reproduction is being performed.

Furthermore, when observing the printing unevenness determination pattern formed in concentric circles with a magnifying glass, if a portion of the circular pattern is collapsed due to ink bleeding, it can be similarly determined that the proof printing has not been performed properly.

In other words, the colored soil film of the present invention can be used in a continuous process from the plate-making process to the printing process, including the control of exposure conditions and proof printing.

(Example) Refer to the drawings below for an example of the present invention! This will be explained in detail as lθ.

Figure 1 shows the colored soil film 1 of the present invention.
...is available.

In this colored soil 2, a ring-shaped halftone dot portion 3 is divided into eight equal parts to form eight fan-shaped halftone dot portions 4A to 4H.

The fan-shaped halftone portions 4A to 4H have halftone dot ratios of 95%, 2%,
Formed in the order of 70%, 50%, 5%, 98%, 30%, 0%, 95% and 5% of the opposing fan-shaped halftone dots 4A and 4E
, fan-shaped dot area 4B, 2% and 98% fan-shaped dot area 4C of 4F
70% and 30% of 14G are arranged so that the total is 100%.

Further, in the 0% fan-shaped halftone dot portion 4H, a letter "M" indicating red is formed. In addition, "C" is used for colored soil 2 for blue color,
"Y" for colored soil 2 for yellow.

The letters rBJ are formed on each of the colored soils 2 for black.

Furthermore, inside this ring-shaped halftone dot part 3, there is a concentric ?
A circular printing unevenness determination pattern 5 is formed by forming a number of circles at intervals.

Next, a method for making a plate using the colored soil film 1 will be explained.

First, a photograph serving as an original is separated into four colors using a scanner to create negative film 6 for each color.

Further, a negative film 6 is created by photographing the block mount. The negative film 6 is laid out on a plate collection layout mask 10 as shown in FIG. 3, and the colored soil film t is attached to the edge of the mask 10 to perform plate collection.

In the subsequent turning operation, the laid-out negative film 6 is turned over by a reversing printer to produce a positive film 7 as shown in FIG.

The colored soil 2 inverted onto the positive film 7 is measured with a dotmeter to check the exposure state of each fan-shaped halftone dot portion 4A to 4H.

In this case, each fan-shaped halftone dot portion 4A to 4H is formed so that the opposing portions total 100%, so for example, as shown in FIG.
As shown in FIG. 2, the inverted positive film 7 has a value of 98%.

Therefore, if you measure the condition of this area with a dotmeter, if it is overexposed, it will be pitch black at 100%, and if it is underexposed, it will be 2%, which is the inversion of the 98% fan-shaped halftone area 4F using negative film. The area becomes completely white.

In this way, if an exposure defect is discovered during the process of reversing a negative to a positive using a reversing printer, the exposure strength is adjusted again and the reversal is performed again.

After creating four positive films 7 for each color in this way, these positive films 7 are layered one by one on a printing plate coated with a light-sensitive material and exposed to light to form a lithographic plate as shown in FIG. Create 8.

After creating four lithographic plates 8 for each color in this manner, test printing is performed on paper using four colors of ink, as shown in FIG.

The fan-shaped dot unit 4A of the printed colored clay 2...
4H is arranged in the same ratio as the positive film 7, and by observing this portion with a magnifying glass, it can be determined whether the reproduction is being performed properly and whether the printed state is appropriate.

The density of the ink can also be adjusted by checking the state of the printed 100% solid fan-shaped halftone dot portion 4H.

Furthermore, by observing the printing unevenness*11 pattern 5 formed in concentric circles with a magnifying glass, if a part of the circular pattern is collapsed due to ink bleeding, it is possible to find out the cause of the printing defect in the proof print.

In this way, by color proofing, the optimum printing conditions are selected, and then the paper is sent to the printing process and printed in large quantities.

Therefore, according to the colored soil film 1 of the present invention, colored soil, which conventionally only had the effect of distinguishing films by color, can now be applied in a series from the plate-making process to the printing process, including exposure conditions and ink management. can.

Further, the colored soil 2 of the present invention has a circular shape with a small area, and since only four colored soils 2 are added at shifted positions, the dead space on the printing surface is reduced and the effective printing surface can be expanded.

In addition, each fan-shaped halftone dot portion 4A to 4H has a total of 10 opposing portions.
Since it is arranged so that it is 0%, even if the ratio is reversed from negative to positive, it will be 95% - 2% - 70%.
Since the arrangement order of 5%-98%-30% is the same, it is possible to immediately determine which portion has what percentage of halftone dots, and work efficiency can be greatly improved.

In the above embodiment, a concentric pattern was formed as the printing unevenness determination pattern 5, but any pattern such as a grid pattern, a diagonal line pattern, or a pattern in which solid and white parts are formed alternately can be used. Good.

Furthermore, the percentage of the halftone area is not limited to the above example, and may be any percentage as long as there are multiple combinations in which the total percentage of the opposing portions is 100%, but at least 98%, 2%, and 50%.
It is better to have halftone dots in order to print with high precision.

(Effects of the Invention) As explained above, according to the colored soil film for color printing of the present invention, the entire process from the plate-making process to the printing process can be managed with one mark, and photographs can be reproduced and printed with high accuracy. Furthermore, since the discrimination mark has a small area, it has various effects such as being able to use the printing surface effectively.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention,
Figure 1 is a plan view showing colored soil film for color printing, Figure 2
The figure is a plan view of colored clay inverted onto a positive film, Figure 3 is a plan view of a negative film collected with a color distortion film attached, Figure 4 is a plane view of a positive film, and Figure 5 is a plane view of a lithographic plate. FIG. 6 is a plan view of the printed matter, and FIG. 7 is a process diagram showing the offset printing process. l... Color distortion film 2... Color distortion 3... Halftone dot part 4A to 4H... Fan-shaped halftone dot part 5...-printing unevenness determination pattern 6... Negative film 7... Positive film 8...Lithograph 9...-Paper 1O...-Layout mask for collection 388 1st Flash figure Figure 4U (5ρ and t) 4E (2,3-:l) Figure 5 Figure Figure

Claims (1)

[Claims] The ring-shaped halftone dot section is divided into a plurality of fan-shaped halftone dot sections, and the sum of the halftone dot ratios of the plurality of opposing fan-shaped halftone dot sections of the divided fan-shaped halftone dot sections is 100%. A colored film for color printing, characterized in that a pattern for determining printing unevenness is formed in the center of the ring-shaped halftone dot part.