JPS6130257B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a halftone dot correction material that can easily correct halftone dots in printing photolithography, etc., and a screen using the halftone dot correction material. Regarding point correction method.

[Conventional technology]

In conventional printing photoengraving using the halftone method, in order to make the image of the final printed matter more effective, halftone dots are used on the halftone film obtained from the manuscript. It is necessary to modify the area of halftone dots in order to partially strengthen or weaken the density of the image, and the halftone dot correction rate is 10%.
If the damage can be corrected, normal work is possible.

As a conventional halftone correction method,
There is the use of a reducing solution or the dry dot etching method (Eastman Kodak Co., etc.).

[Problem that the invention seeks to solve]

There are methods such as the use of a reducing liquid or the dry dot etching method (Eastman Kodak Co., etc.), but when using a reducing liquid, make sure that the reducing liquid does not affect areas other than those that require correction of halftone dots. Staging varnish must be applied with a brush and allowed to dry.
Then, the blackened silver in the halftone dots is eluted with a reducing solution to reduce the size of the halftone dots.

In these operations, a high degree of elaboration was required to determine the end point of the edging and reduction of force when applying the staging varnish.

As a reducing liquid, sulfuric acid, potassium permanganate,
Since mixed aqueous solutions such as permanganic acid are used,
There was a problem in that it was necessary to treat the waste liquid of the above-mentioned chemicals, and the work environment also had to be taken care of.

The dry dot etching method requires a total of four spacers and a diffusion sheet to create a continuous tone mask, and when making halftone correction, the density of the mask is adjusted to the area that requires halftone correction. It was necessary to correct the difference in gradation between the gradation and unnecessary parts to a desired value, and it was necessary to create a mask with a density corresponding to that value.

In addition, in order to partially correct a piece of decomposed negative film, place a transparent film on top of the decomposed negative film, fill in unnecessary parts with opaque on the transparent film on a light table, and then use I had to make a mask. Therefore, when making the opaque, careful attention must be paid to the edges, and two exposures, a mask exposure and a full surface exposure, are required to create a corrected positive.

As a result of intensive research in order to solve the problems of the prior art as described above, the present inventor has developed a halftone dot correction method using a halftone dot correction material in which a peelable colored layer is provided on a transparent support. Therefore, the present invention has been achieved by discovering that the problems of the above-mentioned prior art can be satisfactorily solved.

[Means for solving problems]

That is, the first aspect of the present invention is to apply a thermoplastic synthetic resin layer uniformly colored with a dye or pigment having an actinic ray transmittance in the range of 36% to 11% on a transparent support. A material for correcting halftone dots, characterized in that the plastic synthetic resin layer is peelable from the transparent support, and a second aspect of the invention is a material for correcting halftone dots, which is placed and fixed on a document, making incisions in the peelable thermoplastic synthetic resin colored layer along the outline of the main halftone correction part, leaving the peelable thermoplastic synthetic resin colored layer in contact with the main halftone correction part on the transparent support; This is a method for correcting halftone dots, which is characterized by exposing the transparent support with other parts peeled off and removed from the transparent support.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In the drawings, FIGS. 1 to 3 are partially enlarged cross-sectional views of the material for halftone correction, FIGS. 4 to 9 are drawings for explaining the halftone correction method, and FIG. FIG. 5 is a perspective view showing a partially peeled off state of the peelable thermoplastic synthetic resin colored layer; FIG. 6 is a perspective view taken along the X-X line in FIG. 4. FIG. 7 is a partially enlarged sectional view taken along the line X'-X' in FIG. FIG. 9 is a partially enlarged cross-sectional view showing a developed positive film placed on a silver salt-sensitive material and exposed. FIG. 10 is a partial enlarged cross-sectional view showing a state in which the developed positive film is placed on a silver salt-sensitive material. FIG. 10 is a halftone dot of the original. Figure 11a is an enlarged halftone diagram of the corrected positive film, Figure 11b is an enlarged halftone diagram of the corrected negative film, and Figures 12 and 13 are the halftone dot area of the original and the corrected negative film. FIG. 3 is an explanatory diagram showing the relationship between the amount of change and the halftone dot area.

First, the halftone correction material A of the present invention will be described based on FIGS. 1 to 3, and then FIGS. 4 to 1.
The halftone correction method will be described based on Figure 3.

The halftone dot correction material of the present invention is made up of a transparent support 1 such as a synthetic resin layer and a releasable colored layer 2, as shown in FIG.

The transparent support 1 is made of synthetic resin such as acrylic resin, polyvinyl chloride resin, polyvinylidene chloride resin, polystyrene resin, polypropylene resin, cellulose acetate resin, polyethylene terephthalate resin, polycarbonate resin, polyethylene resin, polyvinyl alcohol resin, etc. It is made of a used film or sheet, and if necessary, glass, highly transparent paper, synthetic paper, etc. can also be used.

Examples of thermoplastic synthetic resins for the peelable colored layer 2 include common thermoplastic synthetic resins such as acrylic resin, polyvinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl alcohol resin, polyvinyl formal resin, and polyvinyl butyral resin. ,
Resins such as polyvinylpyrrolidone resin, nitrile rubber, butadiene rubber, nitrified cotton, cellulose acetate butyrate, ethyl cellulose, polyamide resin, polyester resin, polyurethane resin, polyvinylidene chloride resin, etc. are used alone or in combination, and if necessary, Flexibility can be imparted to the peelable colored layer 2 by blending a phthalic acid type plasticizer, an epoxy type plasticizer, or a non-drying oil type alkyd resin.

The dye used for coloring has a transmittance of 36% to active light, taking into consideration the color sensitivity of the silver salt photosensitive material C used.
Any material that can obtain a range of 11%, preferably a range of 22% to 16% may be used.

In addition, as pigments, for example, microlith pigments (products of Ciba Geigy) or phthalocyanine pigments have small particle diameters, and the transmittance of actinic rays is in the range of 36% to 11%, preferably 22% to 16%. %
It can be used as long as it falls within this range and does not lose its transparency.

However, considering the sensitive wavelength range of the silver salt photosensitive material C used, among many dyes and pigments, some are suitable and others are not.

When a dye having a high transmittance for actinic light having a wavelength in the wavelength range to which silver salt sensitive material C is used is used, the halftone dot correction effect is small.

For example, even if a blue dye is used for a blue-sensitive silver salt photosensitive material, little effect will be obtained.

However, it can be used if the dye concentration is extremely increased, but in such a case it is almost impossible to see the document through the blue transparent layer.

Therefore, the correction method of the present invention is not effective.

Since black or gray dyes and pigments have a light-shielding property against actinic rays over the entire photosensitive wave range of silver salt photosensitive materials, in order to use them in the present invention, their transmission density must be low and their concentration range must be extremely wide. Appropriate conditions cannot be obtained unless the conditions are narrowed.

Comparing the performance of dyes and pigments, dyes have superior uniformity in terms of uniformity in the peelable colored layer, solubility of dyes and dispersibility of pigments.
Furthermore, even if the particle size of the pigment is small, it is larger than the blackened silver particles of the silver salt sensitive material, so there are problems such as "sharpness" in the image, so dyes are suitable.

The hue of the dye and pigment must be selected to match the color sensitivity of silver.

Examples of adaptable dyes by trade name include Eizenspiron Red BEH, GEH, Eizenspiron Pink BH, and Anzenspiron Orange.
2RH, GRH (all Hodogaya Chemical products), Neozapon Red GE, BE, Neo Zapon Fire Red BL, Zapon Fastred 3B, BB, Zapon Scarlet B, CRR (all Basfu Co. products), etc. be.

In the case of Fig. 2, the transparent support 1 has a sandblasted surface 3 or the transparent support 1 has a chemically coated surface 3, and a white or extender pigment is kneaded into the transparent support 1, thereby imparting light diffusing properties to the transparent support 1. It is something that is given.

If it is necessary to adjust the peel strength between the transparent support and the peelable colored layer, a peel adjustment layer 4 may be provided as shown in FIG. 3.

Examples of halftone correction materials are described below.

Example 1 Dye (trade name: Eisenspiron Red BEH, product of Hodogaya Chemical Co., Ltd.) 0.1 g Vinyl chloride-vinyl acetate copolymer (trade name: VYHH)
Union Carbide Co., Ltd. product) 5 g Nitzpol 1432J (Nippon Zeon Co. product) 5 g Methyl ethyl ketone 40.4 g The above composition was stirred until the dye and resin were completely dissolved, and after filtration was applied to a 75μ thick polyethylene terephthalate film using a Meyer bar. During film formation, a filter with a ratten number of 93 is used to
Adjust the coating amount as shown in 1.1, dry, and check the film thickness.
A 16 μm peelable colored layer was formed to obtain a predetermined halftone dot correction material.

Example 2 A halftone dot correction material was obtained in the same manner as in Example 1 except that the transparent support used in Example 1 was changed to Diamat (a sandblasted polyethylene terephthalate film manufactured by KK Kimoto).

Example 3 Vinyl chloride-vinyl acetate copolymer (trade name: Eslec BL-1, product of Sekisui Chemical Co., Ltd.) 10 g Dye (trade name: Eisenspiron Red BEH, product of Hodogaya Chemical Co., Ltd.) 0.1 g Methyl alcohol 40.4 g The above composition The mixture was stirred until the resin and dye were completely dissolved, and a coating solution was obtained after filtration.

A commercially available acrylic adhesive was applied to a 75μ polyethylene terephthalate film using a Mayer bar to a dry film thickness of 3μ, and dried. The coating liquid was applied to this acrylic surface in the same manner as in Example 1 and dried to obtain a material for halftone correction.

The above coating solution was applied to the surface of this acrylic adhesive using a Mayer bar and a filter with a ratten number 93 so that the transmittance was 1.1, and dried to obtain a material for halftone correction.

A halftone dot correction method using the above-described halftone dot correction material will be described below.

Halftone dot correction material A is placed on document B to be corrected, with releasable colored layer 2 facing upward, as shown in FIG.

At this time, the two sheets are fixed with register pins or cellophane tape, etc. so that they do not move, and while looking at the document, incisions are made in the removable colored layer 2 along the outline of the halftone correction main part 7 with a knife, a hot pen, etc.

The cross section at this time is as shown in FIG. 6, where 11 is the support for the document B, and 6 is the pattern forming layer.

Subsequently, unnecessary parts of the peelable colored layer 2 are coated with a fifth layer.
Peel and remove as shown.

The cross section at this time is as shown in FIG.

These two sheets as they are are printed and developed using a contact printer on a silver salt sensitive material C so that the peeled portions are properly exposed.

As a result, as shown in FIG.
In the remaining portion of the photosensitive layer 61 of the silver salt photosensitive material C, a positive pattern with a reduced halftone dot area is formed as shown in FIG. 11a.

In FIG. 8, 12 is a support of a silver salt photosensitive material, and 61 is a photosensitive layer.

As shown in FIG. 9, the photosensitive material C on which a positive image has been formed is again made into a negative using a lithium film.

This result is shown in the enlarged views of halftone dots in FIG. 10 and FIG. 11b. FIG. 10 is a plan view of halftone dot 8 of the original original, and FIG. 11b is a plan view of halftone dot 82 after correction. , the part covered with a peelable colored layer (mask part)
The result is that the halftone dot areas of the original B and the reverse negative film D are different.

In FIG. 9, 13 is the support of the reverse negative film D, and 62 is its photosensitive layer.

An embodiment of the above halftone dot correction method will be described below.

Example 4 Contact firing was performed at a distance of 2 m using tungsten 100V 100W as a light source.

The materials used were those of Examples 1 and 3, and KB film (manufactured by Fuji Photo Film Corporation) was used as the sensitive material. The results are shown in FIG. 12.

In the figure, the vertical axis shows the halftone dot percentage of the negative film, and the horizontal axis shows the halftone dot percentage of the original.

Example 5 The material of Example 1 used in Example 4 was changed to Example 2, and the same procedure as Example 4 was carried out, and the results shown in FIG. 13 were obtained.

Example 6 The material used was Example 1 or 3, a spacer (100μ polyester film) was inserted between the same photosensitive materials as in Example 4, and baking was performed under the same conditions as in Example 4. Example 5 was obtained. Almost the same results were obtained.

[Effect]

As explained above, the present invention provides a halftone dot correction material that is easy to use and inexpensive, and the halftone dot correction method using the halftone dot correction material does not use dangerous chemicals unlike conventional methods. This invention is easy to operate and has superior effects in terms of safety, workability, and economy compared to conventional methods.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 to 3 are partially enlarged cross-sectional views of the material for halftone correction, FIGS. 4 to 9 are diagrams for explaining the halftone correction method, and FIG. FIG. 5 is a perspective view showing a partially peeled state of the peelable colored film; FIG.
Fig. 6 is a partially enlarged sectional view taken along the line X-X in Fig. 4, Fig. 7 is a partially enlarged sectional view taken along the line X'-X' in Fig. 5, and Fig. 8 is a peelable colored film. Fig. 9 is a partially enlarged cross-sectional view showing a state in which the halftone correction material from which halftone has been partially peeled off and the original are placed on a photosensitive material and exposed. 10 is an enlarged halftone dot of the original, FIG. 11a is an enlarged halftone of the corrected positive film, FIG. 11b is an enlarged halftone of the negative film, and FIGS. 12 and 13 are FIG. 3 is an explanatory diagram showing the relationship between the amount of change between the halftone dot area of a document and the halftone dot area of a reverse negative film. 1... Transparent support, 2... Peelable colored layer, 3...
...Sandblast surface or chemical coating surface, 4...Peel strength adjustment layer, 5...Notch, 6
...Pattern forming layer of the original, 7...Main part for halftone correction, 11...Support of the original, 61...Photosensitive layer, 1
2...Support for photosensitive material, 62...Photosensitive layer, 13...
Support for reverse negative film, 8... halftone dots of original negative original, 81... halftone dots of corrected positive, 82...
Negative halftone dots after correction, A...Material for halftone correction, B
...Manuscript, C...Silver halide photosensitive material, D...Reverse negative film.

Claims (1)

[Scope of Claims] 1. A thermoplastic synthetic resin layer uniformly colored with a dye or pigment having an actinic ray transmittance in the range of 36% to 11% is applied on a transparent support, and the thermoplastic synthetic resin layer is coated on a transparent support. A material for halftone correction, characterized in that the material can be peeled off from the transparent support. 2. The material for halftone correction according to claim 1, which uses a transparent support that has been subjected to sandblasting treatment or chemical coating, or a transparent support that has been kneaded with an extender pigment, a white pigment, etc. 3 Place and fix the halftone dot correction material on the manuscript, make a cut in the peelable thermoplastic synthetic resin colored layer along the outline of the main halftone correction part on the document, and make a cut in the peelable thermoplastic synthetic resin colored layer, and make it come into contact with the main halftone correction part. A method for correcting halftone dots, which comprises exposing the peelable thermoplastic synthetic resin colored layer to light while leaving the peelable thermoplastic synthetic resin colored layer on the transparent support and removing other portions from the transparent support.